Patent Description:
There has been known an apparatus for manufacturing a rotor including a laminated body having a magnet insertion hole, and a permanent magnet fixed in the magnet insertion hole with a resin. For example, Patent Literature <NUM> discloses, as an apparatus for manufacturing a laminated iron core, a resin filling apparatus including a pair of sandwiching members and a filling machine.

In the resin filling apparatus disclosed in Patent Literature <NUM>, the sandwiching members are quadrangular flat plates arranged above and below. The upper one of the sandwiching members includes a plurality of resin flow paths penetrating therethrough in a thickness direction. The filling machine includes a plurality of plungers and a drive mechanism. The plungers are respectively located in the resin flow paths, and are movable in the resin flow paths. The drive mechanism is, for example, an air cylinder that moves each of the plungers in the thickness direction of the sandwiching members, based on a command from a controller.

In filling magnet insertion holes in a laminated body with a resin, using the resin filling apparatus disclosed in Patent Literature <NUM>, first, the laminated body is pressurized in such a manner that the laminated body is sandwiched between the sandwiching members. In this pressurized state, the magnet insertion holes are filled with the resin. Specifically, a resin pellet is charged into the resin flow paths, and then the plungers are respectively inserted into the resin flow paths. Thereafter, the controller drives a heater and the drive mechanism to melt the resin pellet, and the plungers supply the molten resin into the magnet insertion holes through the resin flow paths. The resin in each magnet insertion hole is solidified, so that permanent magnets are fixed in the magnet insertion holes with the resin.

Patent Literature <NUM>: <CIT> Patent Literature <NUM>: <CIT> discloses a rotor manufacturing apparatus with improved clamping.

According to the resin filling apparatus disclosed in Patent Literature <NUM>, the laminated body is positioned with respect to the pair of sandwiching members in such a manner that the laminated body is sandwiched between the sandwiching members. The laminated body is sandwiched between the sandwiching members at a position where the laminated body is mounted on the lower one of the sandwiching members. In other words, the position where the laminated body is sandwiched between the sandwiching members differs depending on the position where the laminated body is mounted on the lower sandwiching member. In this case, the magnet insertion holes in the laminated body are possibly misaligned with outlets of resin flow paths in a mold. As a result, the resin is not supplied into the magnet insertion holes in some cases.

An object of the present invention is to provide a rotor manufacturing apparatus for manufacturing a rotor having an accommodation hole for accommodating a magnet, the rotor manufacturing apparatus being capable of easily positioning a rotor main body in supplying a resin into the accommodation hole.

An embodiment of the present invention provides a rotor manufacturing apparatus for manufacturing a rotor including a rotor main body having a hole located at its center and an accommodation hole accommodating a magnet, and the magnet accommodated in the accommodation hole and fixed in the accommodation hole with a resin. The rotor manufacturing apparatus includes: a first mold including a resin receive space portion receiving the resin to be supplied into the accommodation hole, a flow path through which the molten resin flows into the accommodation hole, and a contact portion inserted in the hole, the contact portion being in contact with an inner peripheral face of the hole; and a second mold configured to sandwich the rotor main body in conjunction with the first mold.

According to an embodiment of the present invention, a rotor manufacturing apparatus for manufacturing a rotor having an accommodation hole for accommodating a magnet is capable of easily positioning a rotor main body in supplying a resin into the accommodation hole.

An embodiment of the present invention will be described in detail below with reference to the drawings. In the respective drawings, identical or corresponding portions are denoted with identical reference signs; therefore, the description thereof will not be given repeatedly. In addition, the respective drawings do not faithfully illustrate the dimensions of actual constituent members, dimensional ratios of the constituent members, and the like.

In the following description on a rotor manufacturing apparatus <NUM>, the term "axis direction", "axial", or "axially" refers to a direction parallel with an axis of a rotor main body <NUM>, the term "radial direction", "radial", or "radially" refers to a direction orthogonal to the axis, and the term "circumferential direction", "circumferential", or "circumferentially" refers to a direction along an arc about the axis. Also in the following description, the term "up and down direction" refers to a vertical direction in a state in which the rotor manufacturing apparatus <NUM> is installed. It should be noted, however, that the directional definitions do not intend to limit the orientation of the rotor manufacturing apparatus <NUM> in putting the rotor manufacturing apparatus <NUM> to use.

Also in the following description, the verbal definitions "fix", "connect", "join", "mount", and others involve not only a case where two members are, for example, directly fixed to each other, but also a case where two members are, for example, fixed to each other with another member interposed therebetween. In the following description, the verbal definitions such as "fix" involve a state of, for example, direct fixation between two members and a state of, for example, indirect fixation between two members.

<FIG> is a sectional view of a schematic configuration of a rotor manufacturing apparatus <NUM> according to an embodiment of the present invention. <FIG> is a partially enlarged sectional view of <FIG>. The rotor manufacturing apparatus <NUM> is an apparatus for manufacturing a rotor including a rotor main body <NUM> and a magnet <NUM>. The rotor manufacturing apparatus <NUM> includes a first mold <NUM>, a second mold <NUM>, and a plate <NUM>. In the present embodiment, the first mold <NUM> is located above the second mold <NUM>, and the second mold <NUM> is located below the first mold <NUM>.

A first mold drive mechanism (not illustrated) moves the first mold <NUM> upward and downward relative to the second mold <NUM>. The rotor main body <NUM> is sandwiched between the first mold <NUM> and the second mold <NUM>. At this time, the rotor main body <NUM> is mounted on the plate <NUM> located on the second mold <NUM>.

As illustrated in <FIG>, the rotor main body <NUM> has a hole <NUM> located at its center, and an accommodation hole <NUM> accommodating the magnet <NUM>. It should be noted that <FIG> and <FIG> do not illustrate the magnet <NUM>.

In the present embodiment, the hole <NUM> in the rotor main body <NUM> is a through-hole including the axis of the rotor main body <NUM>. In other words, the rotor main body <NUM> has a cylindrical shape and extends axially. The rotor main body <NUM> includes a projection <NUM> protruding radially inward from an inner peripheral face of the hole <NUM>. The projection <NUM> extends along the axial direction of the hole <NUM>, on the inner peripheral face of the hole <NUM>.

In the present embodiment, the rotor main body <NUM> includes two projections <NUM>. The projections <NUM> are located opposite each other in the radial direction of the hole <NUM>, on the inner peripheral face of the hole <NUM>. In the rotor main body <NUM>, the number of projections may be not less than three.

In the present embodiment, the rotor main body <NUM> has a plurality of accommodation holes <NUM> provided in a pair. The accommodation holes <NUM> are arranged around the hole <NUM> in the circumferential direction of the rotor main body <NUM>. The accommodation holes <NUM> axially penetrate through the rotor main body <NUM>.

Each of the accommodation holes <NUM> accommodates therein a magnet <NUM>. As will be described later, each magnet <NUM> is fixed in the corresponding accommodation hole <NUM> with a resin which the rotor manufacturing apparatus <NUM> supplies into the accommodation holes <NUM>.

As illustrated in <FIG> and <FIG>, the first mold <NUM> includes a resin receive space portion <NUM>, a flow path <NUM>, and a contact portion <NUM>.

The resin receive space portion <NUM> is a space receiving the resin to be supplied into an accommodation hole <NUM>. The resin receive space portion <NUM> is located at the center of the first mold <NUM>. A plunger <NUM> is disposed in the resin receive space portion <NUM>, and is movable up and down in the resin receive space portion <NUM>. A plunger drive mechanism (not illustrated) moves the plunger <NUM> upward and downward.

The flow path <NUM> is a flow path through which the molten resin flows into the accommodation holes <NUM>. In the present embodiment, the first mold <NUM> includes a plurality of the flow paths <NUM> through which the resin is supplied into the accommodation holes <NUM>. The flow paths <NUM> communicate at their upstream sides with the resin receive space portion <NUM>. The flow paths <NUM> have, on their downstream sides, outlets <NUM> opened at a lower face of the first mold <NUM>.

The contact portion <NUM> is inserted in the hole <NUM> in the rotor main body <NUM>, and is in contact with the inner peripheral face of the hole <NUM>. In the present embodiment, the first mold <NUM> includes four contact portions <NUM>. Each of the contact portions <NUM> has a pin shape and protrudes downward from the lower face of the first mold <NUM>. In the first mold <NUM>, the number of contact portions may be not more than three or may be not less than five.

Preferably, the contact portions <NUM> are detachable from the first mold <NUM>. In this case, for example, the contact portions <NUM> are attached to the lower face of the first mold <NUM> with screws.

The second mold <NUM> is configured to sandwich the rotor main body <NUM> in conjunction with the first mold <NUM>. Therefore, the rotor main body <NUM> is mounted above an upper face of the second mold <NUM> with the plate <NUM> interposed between the rotor main body <NUM> and the second mold <NUM> as described above.

The plate <NUM> has a substantially quadrangular plate shape as seen in plan view. The plate <NUM> includes a first protrusion <NUM> protruding from its upper face in the thickness direction. In the present embodiment, the plate <NUM> includes two first protrusions <NUM>. The first protrusions <NUM> protrude upward from the upper face of the plate <NUM>. The rotor main body <NUM> includes a first insertion portion <NUM> in which a first protrusion <NUM> of the plate <NUM> is inserted. In the present embodiment, the plate <NUM> includes the plurality of first protrusions <NUM>, and the rotor main body <NUM> includes a plurality of the first insertion portions <NUM> in accordance with the number of first protrusions <NUM>. Each of the first insertion portions <NUM> is a hole opened at a lower face of the rotor main body <NUM>. Each of the first insertion portions <NUM> has a substantially triangular shape as seen in bottom view. In the plate <NUM>, the number of first protrusions <NUM> may be not less than three. In this case, the rotor main body <NUM> includes three or more first insertion portions <NUM>.

The first mold <NUM> includes a second protrusion <NUM>. In the present embodiment, the first mold <NUM> includes two second protrusions <NUM>. The second protrusions <NUM> protrude downward from the lower face of the first mold <NUM>.

The first mold <NUM> also includes a pillar portion <NUM> inserted in the hole <NUM> in the rotor main body <NUM>. The pillar portion <NUM> has a pillar shape and protrudes downward from the lower face of the first mold <NUM>. The rotor main body <NUM> includes a second insertion portion <NUM> in which a second protrusion <NUM> of the first mold <NUM> is inserted. In the present embodiment, the first mold <NUM> includes the plurality of second protrusions <NUM>, and the rotor main body <NUM> includes a plurality of the second insertion portions <NUM> in accordance with the number of second protrusions <NUM>. Each of the second insertion portions <NUM> is a hole opened at an upper face of the rotor main body <NUM>. Each of the second insertion portions <NUM> has a substantially triangular shape as seen in plan view.

In the present embodiment, the first insertion portions <NUM> located below the rotor main body <NUM> communicate with the second insertion portions <NUM> located above the rotor main body <NUM>. In other words, the rotor main body <NUM> has a plurality of through-holes forming the first insertion portions <NUM> and the second insertion portions <NUM>. The first protrusions <NUM> of the plate <NUM> are inserted in axially first openings of the through-holes. The second protrusions <NUM> of the first mold <NUM> are inserted in axially second openings of the through-holes.

The first mold <NUM> includes a heater <NUM> as a heat source. The second mold <NUM> includes a heater <NUM> as a heat source. The heater <NUM> of the first mold <NUM> is located near the resin receive space portion <NUM> in the first mold <NUM>. The heater <NUM> of the second mold <NUM> is located at an upper end in the second mold <NUM>. The heater <NUM> heats the resin in the resin receive space portion <NUM>. The heater <NUM> heats the rotor main body <NUM>.

Next, a description will be given of an operation of the rotor manufacturing apparatus <NUM> according to the present embodiment. Before the rotor manufacturing apparatus <NUM> starts to operate, first, the plate <NUM> on which the rotor main body <NUM> is mounted is placed on the upper face of the second mold <NUM>. At this time, the first protrusions <NUM> of the plate <NUM> are inserted into the first insertion portions <NUM> in the rotor main body <NUM>. The rotor main body <NUM> is thus positioned with respect to the plate <NUM>, that is, the second mold <NUM>.

As illustrated in <FIG>, the two first protrusions <NUM> are located opposite each other on the plate <NUM> in the radial direction of the rotor main body <NUM>. This configuration therefore enables regulation of axial rotation to the rotor main body <NUM> mounted on the plate <NUM>.

The rotor main body <NUM> is mounted above the second mold <NUM> as described above, and then the first mold drive mechanism (not illustrated) is driven to move the first mold <NUM> downward, so that the rotor main body <NUM> is sandwiched between the first mold <NUM> and the second mold <NUM>. At this time, the contact portions <NUM> of the first mold <NUM> are inserted into the hole <NUM> in the rotor main body <NUM>, and are brought into contact with the inner peripheral face of the hole <NUM>.

The rotor main body <NUM> is thus positioned with respect to the first mold <NUM> and the second mold <NUM> with the rotor main body <NUM> sandwiched between the first mold <NUM> and the second mold <NUM>. In addition, the rotor main body <NUM> is accurately positioned with respect to the first mold <NUM> since the contact portions <NUM> are positioned while being in contact with the inner peripheral face of the hole <NUM>. As illustrated in <FIG>, the four contact portions <NUM> of the first mold <NUM> are equidistantly arranged in the circumferential direction in the hole <NUM> in the rotor main body <NUM> in the state in which the four contact portions <NUM> are inserted in the hole <NUM>. When the rotor main body <NUM> axially rotates relative to the first mold <NUM> in the state in which the four contact portions <NUM> of the first mold <NUM> are inserted in the hole <NUM> in the rotor main body <NUM>, radially opposite two of the four contact portions <NUM> come into contact with the projections <NUM>, respectively. This configuration thus enables regulation of axial rotation to the rotor main body <NUM>.

In addition, when the rotor main body <NUM> is sandwiched between the first mold <NUM> and the second mold <NUM>, the second protrusions <NUM> of the first mold <NUM> are inserted into the second insertion portions <NUM> of the rotor main body <NUM>. The first protrusions <NUM> inserted into the first insertion portions <NUM> of the rotor main body <NUM> and the second protrusions <NUM> inserted into the second insertion portions <NUM> of the rotor main body <NUM> are located axially opposite each other in the state in which the rotor main body <NUM> is sandwiched between the first mold <NUM> and the second mold <NUM>. Therefore, the first protrusions <NUM> and the second protrusions <NUM> overlap each other as seen from the axial direction of the rotor main body <NUM> in the state in which the rotor main body <NUM> is sandwiched between the first mold <NUM> and the second mold <NUM>. This configuration thus enables accurate positioning of the rotor main body <NUM> relative to the first mold <NUM> and the second mold <NUM>.

In addition, the pillar portion <NUM> of the first mold <NUM> is inserted in the hole <NUM> in the rotor main body <NUM>. The pillar portion <NUM> has a distal end that passes through the hole <NUM> and is in contact with the upper face of the plate <NUM>, in the state in which the rotor main body <NUM> is sandwiched between the first mold <NUM> and the second mold <NUM>. The pillar portion <NUM> supports a portion of the first mold <NUM> with which the hole <NUM> in the rotor main body <NUM> is covered for the second mold <NUM>. The upper face of the plate <NUM> with which the hole <NUM> is covered corresponds to a bottom face of the hole <NUM>.

The hole <NUM> in the rotor main body <NUM> may be a hole having a bottom face rather than a through-hole. In this case, the distal end of the pillar portion <NUM> of the first mold <NUM> is in contact with the bottom face of the hole in the rotor main body in the state in which the rotor main body <NUM> is sandwiched between the first mold <NUM> and the second mold <NUM>.

The outlets of the flow paths <NUM> of the first mold <NUM> are located to respectively overlap the accommodation holes <NUM> as seen from the axial direction of the rotor main body <NUM> in the state in which the rotor main body <NUM> is sandwiched between the first mold <NUM> and the second mold <NUM>.

In supplying a resin into the accommodation holes <NUM> in the rotor main body <NUM>, a solid resin material in the resin receive space portion <NUM> is molten by heat using the heater <NUM> of the first mold <NUM>. When the plunger <NUM> is moved downward in the state in which the resin material is molten, the molten resin in the resin receive space portion <NUM> is flowed toward the flow paths <NUM>. The molten resin is thus supplied into the accommodation holes <NUM> through the flow paths <NUM>. The magnets <NUM> are accommodated in the accommodation holes <NUM> in advance.

In supplying the resin into the accommodation holes <NUM>, the rotor main body <NUM> is heated in advance using the heater <NUM> of the second mold <NUM>. The molten resin is thus flowed to lower ends in the accommodation holes <NUM> without being solidified at upper ends in the accommodation holes <NUM>.

The molten resin is supplied into a clearance between each accommodation hole <NUM> and the magnet <NUM> accommodated therein. The resin in the accommodation holes <NUM> is solidified to fix the magnets <NUM> in the accommodation holes <NUM>. The rotor manufacturing apparatus <NUM> thus manufactures a rotor.

A rotor manufacturing apparatus <NUM> according to the present embodiment is a rotor manufacturing apparatus for manufacturing a rotor including a rotor main body <NUM> having a hole <NUM> located at its center and an accommodation hole <NUM> accommodating a magnet <NUM>, and the magnet <NUM> accommodated in the accommodation hole <NUM> and fixed in the accommodation hole <NUM> with a resin. The rotor manufacturing apparatus <NUM> includes: a first mold <NUM> including a resin receive space portion <NUM> receiving the resin to be supplied into the accommodation hole <NUM>, a flow path <NUM> through which the molten resin flows into the accommodation hole <NUM>, and a contact portion <NUM> inserted in the hole <NUM>, the contact portion <NUM> being in contact with an inner peripheral face of the hole <NUM>; and a second mold <NUM> configured to sandwich the rotor main body <NUM> in conjunction with the first mold <NUM>.

In a case where a rotor main body is positioned with respect to a pair of molds in such a manner that the rotor main body is simply sandwiched between the molds, the rotor main body is positioned at a position where the rotor main body is sandwiched between the molds. The position of the rotor main body sandwiched between the molds depends on a position of the rotor main body first mounted on one of the molds. In this case, an outlet of a resin flow path is possibly misaligned with a magnet accommodation hole in the molds.

In order to avoid this misalignment, in the rotor manufacturing apparatus <NUM> according to the present embodiment, the contact portion <NUM> is in contact with the inner peripheral face of the through-hole <NUM> in the rotor main body <NUM> with the rotor main body <NUM> sandwiched between the first mold <NUM> and the second mold <NUM>. The rotor main body <NUM> is thus easily positioned with respect to the first mold <NUM> and the second mold <NUM>. Therefore, the rotor main body <NUM> sandwiched between the first mold <NUM> and the second mold <NUM> is positioned at the position where the contact portion <NUM> is in contact with the inner peripheral face of the through-hole <NUM>. With this configuration, the flow path <NUM> communicates with the accommodation hole <NUM>, so that the resin is reliably supplied into the accommodation hole <NUM> through the flow path <NUM>.

In the rotor manufacturing apparatus <NUM> according to the present embodiment, the rotor main body <NUM> includes a projection <NUM> protruding radially inward from an inner peripheral face of the hole <NUM>. The contact portion <NUM> is in contact with the projection <NUM> in the state in which the rotor main body <NUM> is sandwiched between the first mold <NUM> and the second mold <NUM>.

With this configuration, the rotor main body <NUM> is positioned with respect to the first mold <NUM> and the second mold <NUM> while being regulated as to its axial rotation. In supplying the resin into the accommodation hole <NUM>, therefore, the rotor main body <NUM> is accurately positioned with respect to the first mold <NUM>.

In the rotor manufacturing apparatus <NUM> according to the present embodiment, the first mold <NUM> includes a plurality of the contact portions <NUM>. With this configuration, in supplying the resin into the accommodation hole <NUM>, the rotor main body <NUM> is accurately positioned with respect to the first mold <NUM> as compared with the case where the first mold <NUM> includes one contact portion <NUM>.

The rotor manufacturing apparatus <NUM> according to the present embodiment further includes a plate <NUM> disposed on the second mold <NUM> with the rotor main body <NUM> mounted thereon. The plate <NUM> includes a first protrusion <NUM> protruding in a thickness direction. The rotor main body <NUM> includes a first insertion portion <NUM> in which the first protrusion <NUM> is inserted.

With this configuration, the first protrusion <NUM> is inserted in the first insertion portion <NUM> in the state in which the rotor main body <NUM> is mounted above the second mold <NUM>. The rotor main body <NUM> is thus positioned with respect to the second mold <NUM>. Therefore, the rotor main body <NUM> is easily positioned in such a manner that the rotor main body <NUM> is mounted above the second mold <NUM>.

In the rotor manufacturing apparatus <NUM> according to the present embodiment, the contact portion <NUM> is detachable from the first mold <NUM>. With this configuration, the first mold <NUM> is usable in supplying a resin into a hole in a rotor main body that is different in hole shape from the rotor main body.

In the rotor manufacturing apparatus <NUM> according to the present embodiment, the first mold <NUM> includes a pillar portion <NUM> inserted in the hole <NUM>. The pillar portion <NUM> has a distal end that is in contact with a bottom of the hole <NUM> with the rotor main body <NUM> sandwiched between the first mold <NUM> and the second mold <NUM>.

With this configuration, the pillar portion <NUM> supports a portion of the first mold <NUM> with which the hole <NUM> in the rotor main body <NUM> is covered. In supplying the resin into the accommodation hole <NUM>, therefore, the portion of the first mold <NUM>, with which the hole <NUM> in the rotor main body <NUM> is covered, is not bent toward the second mold <NUM>.

In the rotor manufacturing apparatus <NUM> according to the present embodiment, the first mold <NUM> further includes a second protrusion <NUM>. The rotor main body <NUM> includes a second insertion portion <NUM> in which the second protrusion <NUM> is inserted. The first protrusion <NUM> and the second protrusion <NUM> overlap each other as seen from the axial direction of the rotor main body <NUM> in the state in which the rotor main body <NUM> is sandwiched between the first mold <NUM> and the second mold <NUM>.

With this configuration, the position of the rotor main body <NUM> positioned by the first protrusion <NUM> and the position of the rotor main body <NUM> positioned by the second protrusion <NUM> overlap each other as seen from the axial direction. In supplying the resin into the accommodation hole <NUM>, therefore, the rotor main body <NUM> is accurately positioned.

In the rotor manufacturing apparatus <NUM> according to the present embodiment, the rotor main body <NUM> includes a plurality of the accommodation holes <NUM>. The first mold <NUM> includes a plurality of the flow paths <NUM> through which the resin is supplied into the accommodation holes <NUM>. The flow paths <NUM> communicate with the resin receive space portion <NUM> that is shared.

With this configuration, the resin receive space portion <NUM> of the first mold <NUM> is shared. Therefore, the configuration of the rotor manufacturing apparatus <NUM> is simplified as compared with a case where multiple resin receive space portions respectively communicate with the flow paths <NUM>.

The foregoing description concerns an embodiment of the present invention; however, the foregoing embodiment is merely an example for embodying the present invention. The present invention is not limited to the foregoing embodiment, and the foregoing embodiment may be appropriately modified within a range not departing from the scope of the present invention.

In the foregoing embodiment, the first mold <NUM> and the second mold <NUM> are arranged up and down. However, the present invention is not limited to this arrangement. Alternatively, the first mold <NUM> and the second mold <NUM> may be arranged left and right.

In the foregoing embodiment, each of the accommodation holes <NUM> is a through-hole. Alternatively, an accommodation hole may be opened at an outer peripheral face of a rotor main body. For example, each accommodation hole may have a groove shape and extend axially on the outer peripheral face of the rotor main body <NUM>. In this case, the magnets may be exposed from the outer peripheral face of the rotor main body.

In the foregoing embodiment, each of the first insertion portions <NUM> is a hole. Alternatively, each first insertion portion may be a step located at an outer periphery of the rotor main body. Still alternatively, each first insertion portion may be a groove extending axially on the outer peripheral face of the rotor main body.

Claim 1:
A rotor manufacturing apparatus (<NUM>) for manufacturing a rotor including a rotor main body (<NUM>) having a hole (<NUM>) located at its center and an accommodation hole (<NUM>) accommodating a magnet (<NUM>), and the magnet (<NUM>) accommodated in the accommodation hole (<NUM>) and fixed in the accommodation hole (<NUM>) with a resin,
the rotor manufacturing apparatus (<NUM>) comprising:
a first mold (<NUM>) including
a resin receive space portion (<NUM>) receiving the resin to be supplied into the accommodation hole (<NUM>),
a flow path (<NUM>) through which the molten resin flows into the accommodation hole (<NUM>), and
a contact portion (<NUM>) configured to be inserted into the hole (<NUM>),
the contact portion (<NUM>) being configured to be in contact with an inner peripheral face of the hole (<NUM>); and
a second mold (<NUM>) configured to sandwich the rotor main body (<NUM>) in conjunction with the first mold (<NUM>),
characterized in that
the contact portion (<NUM>) has a pin shape and protrudes from a face of the first mold (<NUM>) facing the second mold (<NUM>) towards the second mold (<NUM>).