Patent Abstract:
An injection mold includes a first mold base, a first mold core, a second mold base, a fastening member, a second mold core and at least one elastic member. The first mold core is fixed to the first mold base, and the fastening member is fixed to the second mold base. The second mold core is movably mounted on the second mold base for engaging with the first mold core to fabricate a workpiece. The at least one elastic member acts as a shock absorber between the fastening member and the second mold core.

Full Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The present disclosure generally relates to molds, and particularly to an injection mold. 
         [0003]    2. Description of Related Art 
         [0004]    An injection mold is employed to fabricate parts from thermoplastic or thermosetting materials. The injection mold includes a first mold base, a first mold core, a second mold base and a second mold core. The first mold core is fixed to the first mold base, and the second mold core is fixed to the second mold. When in use, the second mold core abuts against the first mold core to mold a workpiece; the second mold core moves away from the first mold core to open the injection mold. In the above-described process, the first and second mold cores may be damaged easily, and need to be substituted or replaced frequently. 
         [0005]    Therefore, there is room for improvement in the art. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0006]    The components in the drawings are not necessarily drawn to scale, the emphasis instead placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
           [0007]      FIG. 1  is an isometric, assembled view of an embodiment of an injection mold. 
           [0008]      FIG. 2  is an exploded, isometric view of the injection mold of  FIG. 1 . 
           [0009]      FIG. 3  is similar to  FIG. 2 , but viewed from another aspect. 
           [0010]      FIG. 4  is a cross-sectional view of the injection mold of  FIG. 1  before closing the mold, taken along line IV-IV. 
           [0011]      FIG. 5  is a cross-sectional view of the injection mold of  FIG. 1  after closing the mold, taken along line IV-IV. 
       
    
    
     DETAILED DESCRIPTION 
       [0012]      FIGS. 1 through 3 , show an embodiment of an injection mold  100  used in an injection molding machine for fabricating parts made from thermoplastic or thermosetting materials. The injection mold  100  includes a supporting member  10 , a first mold base  20 , a first mold core  30 , a fastening member  40 , a second mold base  50 , a second mold core  60  and four elastic members  70 . The first mold base  20  is fastened on the supporting member  10 , the first mold core  30  is fastened to the first mold base  20 . The second mold base  50  is fastened on the fastening member  40 , the second mold core  60  is sandwiched between the fastening member  40  and the second mold base  50 . The four elastic members  70  are contained between the second mold core  60  and the fastening member  40 . 
         [0013]    The supporting member  10  includes a base board  12  and a pair of fastening portions  14  formed on the base board  12 . In the illustrated embodiment, the base board  12  is a substantially rectangular board. The pair of fastening portions  14  are at opposite ends of a surface of the base board  12  and parallel to each other. 
         [0014]    The first mold base  20  is a substantially rectangular board, and is fastened to the pair of fastening portions  14  of the supporting member  10 . The first mold base  20  includes a resisting surface  23  and four locating posts  22  on the resisting surface  23 . The resisting surface  23  is an upper surface of the first mold base  20  opposite to the supporting member  10 , the four locating posts  22  are at the four corners of the resisting surface  23 . The first mold base  20  further defines a first receiving cavity  24  at a middle portion of the resisting surface  23  for receiving the first mold core  30 . In the illustrated embodiment, the first mold core  30  is a rectangular block with a pattern of grooves, and the first receiving cavity  24  is a rectangular groove configured for receiving the first mold core  30 . 
         [0015]    The fastening member  40  is a substantially rectangular board, and defines four fastening holes  42  at the four corners thereof. The second mold base  50  is a substantially rectangular board, which includes a first supporting surface  52  and a second supporting surface  54  opposite to the first supporting surface  52 . The first supporting surface  52  defines four locating holes  522  at the four corners thereof and a second receiving cavity  524  in the middle portion thereof. The four locating holes  522  correspond to the four locating posts  22  of the first mold base  20 , and the second receiving cavity  524  is configured for receiving the second mold core  60 . The second supporting surface  54  defines four fastening holes  542  corresponding to the four fastening holes  42  of the fastening member  40 . The second receiving cavity  524  is a rectangular through hole, and includes a pair of stepped grooves  5242  recessed from opposite sidewalls of the second receiving cavity  524 . 
         [0016]    Referring to  FIGS. 4 and 5 , the second mold core  60  is received in the second receiving cavity  524 , and includes a top surface  62  and a bottom surface  64 . A height of the second mold core  60  is the same as a depth of the second receiving cavity  524 . The second mold core  60  defines four containing holes  622  on the top surface  62  at the four corners of the second mold core  60 , and further includes a pair of supporting portions  626  perpendicularly extending out from opposite ends of the second mold core  60 . Each of the pair of supporting portions  626  is received in a stepped groove  5242 . A height H 1  of each of the supporting portions  626  is less than a depth H 2  of each of the stepped grooves  5242 . Each of the four elastic members  70  is partly received in one containing hole  622 . 
         [0017]    In alternative embodiments, the number of the elastic members  70  can be one, or two, or three or more, and the number of the containing holes  622  for receiving the elastic members  70  changes accordingly. 
         [0018]    In alternative embodiments, the fastening member  40  may define four positioning holes (not shown) at a surface thereof facing the second mold core  60  corresponding to the containing holes  622  to receive the elastic members  70 . 
         [0019]    In assembly, the supporting member  10  is fastened to a driving member. The first mold base  20  is fixed to the supporting member  10 , and the first mold core  30  is received in the first receiving cavity  24  of the first mold base  20 . The second mold core  60  is received in the second receiving cavity  524  of the second mold base  50 , and the second mold base  50  is fastened to the fastening member  40 . An end of each of the four elastic members  70  is received in one containing hole  622 , while the other end of each elastic member  70  elastically resists with the fastening member  40 , such that the second mold core  60  is movably resisted between the second mold base  50  and the fastening member  40 . The second mold core  60  protrudes out of the second receiving cavity  524  due to the urging force exerted by the elastic members  70  and the gravity of the second mold core  60 . The height of the protruding portion of the second mold core  60  is equal to a difference in height between the depth H 2  of the stepped groove  5242  and the height H 1  of the supporting portion  626  (shown in  FIG. 4 ). 
         [0020]    In the mold closing process, the first mold base  20  is located below the second mold base  50  with the first mold core  30  aligned to the second mold core  60 . The driving member drives the first mold core  30  to move towards the second mold core  60  until each of the four locating posts  22  is received in one locating hole  522 . At this time, the first mold core  30  resists the second mold core  60  and drives the second mold core  60  to move towards the fastening member  40 . When each of the four elastic members  70  is completely received in one containing hole  622  (shown in  FIG. 5 ), the second mold core  60  makes contact with the fastening member  40 . As the four elastic members  70  resist the second mold core  60  when the first mold core  30  moves towards the second mold core  60 , any collisions or grinding between the first mold core  30  and the second mold core  60  are dampened or reduced, thereby avoiding damage to the first mold core  30  and the second mold core  60 . 
         [0021]    When unloading the injection mold  100 , the driving member drives the first mold base  20  to move away from the second mold base  50 . The second mold core  60  moves away from the fastening member  40  and abuts against the second mold base  50 , such that the injection mold  100  is opened. 
         [0022]    The second mold core  60  is movably received in the second mold base  50 , and the four elastic members  70  are contained between the second mold core  60  and the fastening member  40 , such that the elastic members  70  prevent the first mold core  30  and the second mold core  60  from collision damage when the injection mold  100  is closed. The four elastic members  70  push the second mold core  60  away from the fastening member  40  to enable the injection mold  100  to be opened easily. 
         [0023]    The supporting member  10  may be omitted, and the first mold base  20  is connected to the driving member directly. 
         [0024]    While the present disclosure has been described with reference to particular embodiments, the description is illustrative of the disclosure and is not to be construed as limiting the disclosure. Therefore, various modifications can be made to the embodiments by those of ordinary skill in the art without departing from the true spirit and scope of the disclosure, as defined by the appended claims.

Technology Classification (CPC): 1