Wheel hub molding and casting die and preparation process thereof

A wheel hub molding and casting die includes: a casting die shell, a supporting bottom plate, a limiting bottom plate, a lifting module, a module supporting plate, a lower die, an upper die and removable plates. The supporting bottom plate is mounted on the lower surface of the casting die shell. The limiting bottom plate is arranged below the supporting bottom plate. The module supporting plate is movably arranged in a molding cavity. The lifting module is connected between the bottom of the molding cavity and the module supporting plate. The lower die and the upper die are closed to form a pouring cavity. Annular slots are formed in the outer side wall of the upper die. Removable plate slots are formed in the upper surface of the casting die shell.

FIELD

The present disclosure relates to the technical field of casting dies, and more particularly relates to a wheel hub molding and casting die and a preparation process thereof.

BACKGROUND

A wheel hub molding and casting die is a die for manufacturing a wheel hub. The wheel hub molding and casting die generally uses a pouring form, so as to facilitate pouring according to an actual shape requirement of a wheel hub. Since the wheel hub is an important part of an automobile tire, a wheel hub blank has great influence on the quality of the wheel hub. In a use process of an existing wheel hub molding and casting die, it is relatively inconvenient to open the die, so that after a pouring procedure and a cooling procedure are performed, the surface of a molded wheel hub is very easy to scrape and a lot of time would be spent in a taking out procedure of the molded wheel hub.

Therefore, there is a need for a wheel hub molding and casting die and a preparation process thereof to solve or at least relieve the defects in the prior art.

SUMMARY

The technical problem to be solved in the present disclosure is how to ensure that a die does not scrape a molded wheel hub when being taken down from the molded wheel hub and facilitate the taking out of the die.

The technical solution adopted by the present disclosure is as follows.

The first aspect of the present disclosure provides a wheel hub molding and casting die. The wheel hub molding and casting die includes: a casting die shell, a supporting bottom plate, a limiting bottom plate, a lifting module, a module supporting plate, a lower die, an upper die and removable plates.

The supporting bottom plate is tightly mounted on the lower surface of the casting die shell.

The limiting bottom plate is arranged below the supporting bottom plate, and is used to support and limit the casting die shell and the supporting bottom plate.

A molding cavity is formed in the middle part of the upper surface of the casting die shell. The lower end of the lifting module is mounted at the middle position of the bottom of the molding cavity. The upper end of the lifting module is mounted at the middle part of the lower surface of the module supporting plate. The module supporting plate is movably arranged in the molding cavity. The lifting module is used to push the module supporting plate to move.

Both the lower die and the upper die are of detachable structures. The lower die is mounted at the middle part of the upper surface of the module supporting plate. The upper die is arranged on the outer side of the lower die in a sleeving manner. The outer wall of the lower die and the inner wall of the upper die are closed to form a pouring cavity. A plurality of pouring holes passing through the pouring cavity are formed in the upper surface of the upper die. Annular slots are formed in the outer side wall of the upper die.

A plurality of removable plate slots communicating with the molding cavity are formed in the upper surface of the casting die shell. The removable plates are arranged on the removable plate slots in a movably limited manner. The removable plates are fitted with the annular slots, and are used to remove and take out the upper die after the pouring is completed.

Preferably, the casting die shell is of a rectangular shell-like structure. The molding cavity is of a circular cavity structure. The module supporting plate is of a circular plate-type structure fitted with the molding cavity.

Preferably, a limiting column is arranged in the center of the upper surface of the module supporting plate. A limiting slot fitted with the limiting column is formed in the middle part of the lower surface of the lower die. The lower die is clamped at the middle part of the upper surface of the module supporting plate through the matching between the limiting column and the limiting slot.

Preferably, the upper die is of a cylindrical shell-like structure. The plurality of pouring holes are uniformly distributed relative to a circumferential direction of the upper surface of the upper die.

Preferably, the lower surface of the lower die and the upper surface of the module supporting plate are hermetically fitted, and the lower surface of the upper die and the upper surface of the module supporting plate are hermetically fitted.

Preferably, moving slots are formed in two side walls of the removable plate slots, and each of the moving slots includes a first branch slot, a second branch slot and a third branch slot which communicate in sequence.

The second branch slots are straight slots in the same direction as the removable plate slots. The first branch slots and the third branch slots are separately arranged at two ends of the second branch slots. The first branch slots and the third branch slots are both fixed clamping slots that are slantways downward relative to the second branch slots.

Mounting through holes are formed in the middle parts of the side walls of the removable plates. Supporting shafts movably passing through the side walls of the removable plates are arranged at the middle parts of the side walls of the removable plates through the mounting through holes. The end parts of the supporting shafts are fitted with the moving slots. The end parts of two ends of the supporting shafts are removably placed in the moving slots.

Preferably, the mounting through holes include first side holes, middle holes and second side holes which communicate in sequence. The apertures of the first side holes and the second side holes are the same, and are less than the apertures of the middle holes.

Each of the supporting shafts includes two struts and a connection spring. The struts are of “T”-shaped cylinder structures. The two struts are separately arranged on two sides of the mounting through hole. The sections, having a relatively large diameter, of the struts are clamped in the middle holes. The connection spring is connected between the end parts of the sections, having a relatively large diameter, of the two struts.

Preferably, locating tubes are fixed at the periphery of the upper surface of the limiting bottom plate. The locating tubes are of circular barrel-shaped structures with openings in the tops. Locating columns fitted with the locating tubes are arranged on the lower surface of the supporting bottom plate. The limiting bottom plate supports and limits the casting die shell and the supporting bottom plate through the movable matching between the locating tubes and the locating columns.

Preferably, the lifting module is a cylinder. The fixed end of the cylinder is mounted at the middle position of the bottom of the molding cavity. The movable end of the cylinder is mounted at the middle part of the lower surface of the module supporting plate.

The second aspect of the present disclosure provides a preparation process of the wheel hub molding and casting die as mentioned above. The preparation process includes:

1) preparatory work before pouring: fixedly mounting a lower die and an upper die on a module supporting plate, driving the module supporting plate and the lower die and the upper die which are fixed thereon to be retracted at the bottom of the molding cavity by using a lifting module, and moving and limiting removable plates at the outer ends of removable plate slots to ensure that the end parts of the removable plates do not extend into the molding cavity;

2) pouring: uniformly pouring metal liquid required by prefabrication of a wheel hub into a pouring cavity through pouring holes of the upper die;

3) normal-temperature cooling: after the pouring is completed for 20 to 30 min, driving the module supporting plate and the lower die and the upper die which are fixed thereon to extend out of the upper end of the molding cavity by using the lifting module, and standing under a normal-temperature condition for 10 to 12 h for cooling; and

4) taking out of a molded wheel hub: after the normal-temperature cooling is completed, adjusting the height of the module supporting plate by using the lifting module till annular slots in the outer side wall of the upper die are aligned with the removable plates, moving the removable plates to enable the end parts of the removable plates to be clamped in the annular slots, cyclically levering the ends, away from the upper die, of the removable plates, removing and taking out the upper die, and then taking down the molded wheel hub from the lower die.

According to one or more implementations of the present disclosure, the following beneficial effects can be achieved:

The wheel hub molding and casting die and the preparation process thereof of the present disclosure can conveniently and quickly take down the upper die from the molded wheel hub, so that it is ensured that the upper die would not scrape the molded wheel hub when being taken down from the molded wheel hub. The wheel hub molding and casting die is simple in structure and convenient to operate, and effectively improves the quality of the molded wheel hub, so cracks are not liable to form on the wheel hub.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The exemplary implementations of the present disclosure are described below in detail with reference to the drawings. The descriptions of the exemplary implementations are merely illustrative, and shall in no way limit the present disclosure and its application or usage. Furthermore, the sizes and proportions of all the components in the drawings are also merely illustrative, and do not really correspond to actual products.

The core of the present disclosure is to provide a wheel hub molding and casting die, which can ensure that the die would not scrape a molded wheel hub when being taken down from the molded wheel hub and facilitate the taking out of the die. The other core of the present disclosure is to provide a preparation process of a wheel hub molding and casting die, which can ensure the correct use of the wheel hub molding and casting die and improve the quality of the molded wheel hub.

Referring toFIGS. 1 to 9, on the first aspect, the embodiment of the present disclosure provides a wheel hub molding and casting die. The wheel hub molding and casting die includes: a casting die shell1, a supporting bottom plate2, a limiting bottom plate3, a lifting module4, a module supporting plate5, a lower die6, an upper die7and removable plates8. The supporting bottom plate2is tightly mounted on the lower surface of the casting die shell1. The limiting bottom plate3is arranged below the supporting bottom plate2, and is used to support and limit the casting die shell1and the supporting bottom plate2. A molding cavity11is formed in the middle part of the upper surface of the casting die shell1. The lower end of the lifting module4is mounted at the middle position of the bottom of the molding cavity11. The upper end of the lifting module4is mounted at the middle part of the lower surface of the module supporting plate5. The module supporting plate5is movably arranged in the molding cavity11. The lifting module4is used to push the module supporting plate5to move. Both the lower die6and the upper die7are of detachable structures. The lower die6is mounted at the middle part of the upper surface of the module supporting plate5. The upper die7is arranged on the outer side of the lower die6in a sleeving manner. The outer wall of the lower die6and the inner wall of the upper die7are closed to form a pouring cavity9. A plurality of pouring holes71passing through the pouring cavity9are formed in the upper surface of the upper die7. Annular slots72are formed in the outer side wall of the upper die7. A plurality of removable plate slots12communicating with the molding cavity11are formed in the upper surface of the casting die shell1. The removable plates8are arranged on the removable plate slots12in a movably limited manner. The removable plates8are fitted with the annular slots72, and are used to remove and take out the upper die7after the pouring is completed.

The working principle of the wheel hub molding and casting die provided by the embodiment of the present disclosure is described below.

During use, the module supporting plate5is firstly pushed out of the upper end of the molding cavity11by using the lifting module4, and the lower die6and the upper die7are fixedly mounted on the module supporting plate5. Then, the module supporting plate5and the lower die6and the upper die7which are fixed thereon are driven to be retracted at the bottom of the molding cavity11by using the lifting module4. The removable plates8are moved and limited at the outer ends of the removable plate slots12to ensure that the end parts of the removable plates8do not extend into the molding cavity11. Metal liquid required by prefabrication of a wheel hub is uniformly poured into the pouring cavity9formed by the upper die7and the lower die6through the pouring holes71of the upper die7. After the pouring is completed for 20 to 30 min, the module supporting plate5and the lower die6and the upper die7which are fixed thereon are driven to extend out of the upper end of the molding cavity11by using the lifting module4, and stand under a normal-temperature condition for 10 to 12 h for cooling. After the normal-temperature cooling is completed, the height of the module supporting plate5is adjusted by using the lifting module4to adjust the position of the upper die7till the annular slots72in the outer side wall of the upper die7are aligned with the removable plates8. The removable plates8are moved to enable one end of each of the removable plates8to get close to the upper die7till the end part of one end of the removable plate8is clamped in the annular slot72. Then, the ends, away from the upper die7, of the removable plates8are cyclically levered to remove and take out the upper die7. The molded wheel hub is taken down from the lower die6, and the lower die6is taken down from the module supporting plate5. Therefore, the preparation of the molded wheel hub is completed.

It can be seen that according to the wheel hub molding and casting die provided by the embodiment of the present disclosure, by arranging the removable plate slots12and the removable plates8on the casting die shell1and setting the upper die7to be a detachable structure, after the pouring and cooling are completed, the removable plates8are used to cyclically lever the upper die7, so that the upper die7may be conveniently and quickly taken down from the molded wheel hub to ensure that the upper die7would not scrape the molded wheel hub when being taken down from the molded wheel hub. The wheel hub molding and casting die is simple in structure and convenient to operate, and effectively improves the quality of the molded wheel hub.

The casting die shell1may be of a rectangular shell-like structure. The molding cavity11may be of a circular cavity structure. The module supporting plate5is of a circular plate-type structure fitted with the molding cavity11, which is advantageous for the machining and matching of the molding cavity11and the module supporting plate5.

As mentioned above, the lower die6is mounted at the middle part of the upper surface of the module supporting plate5. In order to facilitate the fixed locating of the lower die6, a matching mode for the module supporting plate5and the lower die6is specifically provided below: a limiting column51is arranged in the center of the upper surface of the module supporting plate5; a limiting slot61fitted with the limiting column51is formed in the middle part of the lower surface of the lower die6; and the lower die6is clamped at the middle part of the upper surface of the module supporting plate5through the matching between the limiting column51and the limiting slot61.

Further, in order to facilitate the pouring and ensure relatively uniform dispersion of the metal liquid during pouring to improve the quality of the poured molded wheel hub, in the embodiment of the present disclosure, the upper die7may be of a cylindrical shell-like structure, and the outer diameter of the upper die7is fitted with the inner diameter of the molding cavity11. The plurality of pouring holes71are uniformly distributed relative to a circumferential direction of the upper surface of the upper die7. Preferably, there may be four pouring holes71. The four pouring holes71are uniformly distributed along the circumferential direction of the upper surface of the upper die7.

In the embodiment of the present disclosure, in order to facilitate the removal and installation of the upper die7and the lower die6, both the upper die7and the lower die6are of detachable structures. Preferably, the upper die7may include two mutually symmetrically fitted half upper dies. The two half upper dies are detachably fixedly connected into a whole. Similarly, the lower die6may include two mutually symmetrically fitted half lower dies. The two half lower dies are detachably fixedly connected into a whole.

In the embodiment of the present disclosure, in order to avoid the metal liquid from flowing out of the pouring cavity9and affecting the pouring quality, the lower surface of the lower die6is hermetically fitted to the upper surface of the module supporting plate5, and the lower surface of the upper die7is hermetically fitted to the upper surface of the module supporting plate5.

As mentioned above, the removable plates8are arranged on the removable plate slots12in the movably limited manner. For how to realize the movably limited arrangement of the removable plates8on the removable plate slots12, the embodiment of the present disclosure provides a specific structure of the removable plate slot12and the removable plate8.

Specifically, moving slots13are formed in two side walls of the removable plate slot12, and each of the moving slots13includes a first branch slot131, a second branch slot132and a third branch slot133which communicate in sequence.

The second branch slot132is a straight slot in the same direction as the removable plate slot12. The first branch slot131and the third branch slot133are separately arranged at two ends of the second branch slot132. The first branch slot131and the third branch slot133are both fixed clamping slots that are slantways downward relative to the second branch slot132.

A mounting through hole81is formed in the middle part of the side wall of the removable plate8. A supporting shaft82movably passing through the side wall of the removable plate8is arranged at the middle part of the side wall of the removable plate8through the mounting through hole81. The end parts of the supporting shaft82are fitted with the moving slots13. The end parts of the two ends of the supporting shaft82are removably placed in the moving slots13.

When the removable plates8need to be limited and fixed, the removable plates8are moved to the fixed clamping slots. The positions of the first branch slots131, the second branch slots132and the third branch slots133are set according to the position and size of the molding cavity11and the positions of the annular slots72when the upper die7is fixed on the module supporting plate5. When it is ensured that the removable plates8are located in the fixed clamping slots close to the molding cavity11, the removable plates8are just clamped in the annular slots72; and when the removable plates8are located in the fixed clamping slots away from the molding cavity11, the removable plates8do not extend into the molding cavity11. The first branch slots131are farther from the molding cavity than the third branch slots133.

In order to facilitate the removal and installation of the removable plates8, the mounting through holes81include first side holes, middle holes and second side holes which communicate in sequence. The apertures of the first side holes and the second side holes are the same, and are less than the apertures of the middle holes.

Each of the supporting shafts82includes two struts821and a connection spring822. The struts821are of “T”-shaped cylinder structures. The two struts821are separately arranged on two sides of the mounting through hole81. The sections, having a relatively large diameter, of the struts821are clamped in the middle holes. The connection spring822is connected between the end parts of the sections, having a relatively large diameter, of the two struts821.

Further, in order to increase the clamping force between the removable plates8and the annular slots72and facilitate the cyclic levering of the removable plates8, in the embodiment of the present disclosure, there may be four removable plate slots12. The four removable plate slots12are symmetrically distributed, and are all located at the middle parts of the side edges of the casting die shell1. The removable plate slots12may be of “L”-shaped structures. The slot depth of the end, away from the molding cavity11, of each removable plate slot12is greater than the slot depth of the end, close to the molding cavity11, of the removable plate slot12.

Preferably, in the embodiment of the present disclosure, in order to achieve the supporting and limiting effects of the limiting bottom plate3on the casting die shell1and the supporting bottom plate2, locating tubes31are fixed at the periphery of the upper surface of the limiting bottom plate3. The locating tubes31are of circular barrel-shaped structures with openings in the tops. Locating columns21fitted with the locating tubes31are arranged on the lower surface of the supporting bottom plate2. The limiting bottom plate3supports and limits the casting die shell1and the supporting bottom plate2through the movable matching between the locating tubes31and the locating columns21.

The supporting bottom plate2may be tightly mounted on the lower surface of the casting die shell1in a bolting manner, so as to ensure that the upper surface of the supporting bottom plate2is tightly fitted to the lower surface of the casting die shell1.

Preferably, in the embodiment of the present disclosure, the lifting module4may be a cylinder. The fixed end of the cylinder is mounted at the middle position of the bottom of the molding cavity11. The movable end of the cylinder is mounted at the middle part of the lower surface of the module supporting plate5.

On the second aspect, the embodiment of the present disclosure provides a preparation process of the wheel hub molding and casting die as mentioned above. The preparation process includes the following steps that:

1) preparatory work before pouring: a lower die6and an upper die7are fixedly mounted on a module supporting plate5; the module supporting plate5and the lower die6and the upper die7which are fixed thereon are driven to be retracted at the bottom of the molding cavity11by using the lifting module4; removable plates8are moved and limited at the outer ends of removable plate slots12to ensure that the end parts of the removable plates8do not extend into the molding cavity;

2) pouring: metal liquid required by prefabrication of a wheel hub is uniformly poured into a pouring cavity9through pouring holes71of the upper die7;

3) normal-temperature cooling: after the pouring is completed for 20 to 30 min, the module supporting plate5and the lower die6and the upper die7which are fixed thereon are driven to extend out of the upper end of the molding cavity11by using the lifting module4, and stand under a normal-temperature condition for 10 to 12 h for cooling; and

4) taking out of a molded wheel hub: after the normal-temperature cooling is completed, the height of the module supporting plate5is adjusted by using the lifting module4till annular slots72in the outer side wall of the upper die7are aligned with the removable plates8; the removable plates8are moved to enable the end parts of the removable plates8to be clamped in the annular slots72; the ends, away from the upper die7, of the removable plates8are cyclically levered; and the upper die7is removed and taken out, and then the molded wheel hub is taken down from the lower die6.

It can be seen that according to the preparation process of the wheel hub molding and casting die provided by the embodiment of the present disclosure, the upper die7may be successfully taken down from the molded wheel hub to ensure that the upper die7would not scrape the molded wheel hub when being taken down from the molded wheel hub, so that the wheel hub molding and casting die is simple in structure and convenient to operate, and effectively improves the quality of the molded wheel hub. Furthermore, the normal-temperature cooling includes short-time cooling in the molding cavity11and long-time cooling outside the molding cavity11, so that the wheel hub molding quality is effectively improved, and cracks are not liable to form on the wheel hub.