Annular back-off wax injection mold

Abstract

The utility model relates to an annular back-off wax injection mold which comprises a lower mold plate and an upper mold plate, a cavity is formed in the upper side of the lower mold plate, the lower mold plate is provided with a moving cavity and a moving mold core, an annular groove is formed in the outer side of the moving mold core, an elastic piece is arranged between the moving mold core and the moving cavity, and a shoveling machine corresponding to a communicating groove is arranged at the bottom of the upper mold plate. When the upper mold plate moves towards the lower mold plate for mold closing, the mold plate shoveling machine is clamped into the communicating groove, the shoveling machine abuts against the movable mold core and compresses the elastic piece, and during mold closing, the movable mold core moves to a preset position, so that the annular groove of the movable mold core moves outwards, and an annular cavity corresponding to a product is formed between the annular groove of the movable mold core and the cavity; after wax injection is completed, the movable mold core horizontally moves under the action of the elastic piece, so that the movable mold core is separated from a formed product, movement of the movable mold core is controlled under the action of the elastic piece and the upper mold plate shovel machine, extra manual taking is not needed, automation in the wax injection process is achieved, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of molds, and particularly to an annular undercut wax injection mold. Background Art

[0002] In the case where a wax product has an annular groove inside, if it is to be produced by a mold, generally multiple movable blocks are provided. Before production, the movable blocks are fixed in the mold to form a cavity corresponding to the product. After wax injection, the mold is first opened to move the position of the movable blocks or take them out, then the obtained product is taken out, and then the movable blocks are placed in the corresponding positions to complete the production of the wax mold. In this way, the production efficiency is slow during the production process, and if the movable blocks are not fixed properly, it will affect the quality of the wax mold. Summary of the Utility Model

[0003] Based on this, in view of the problems in the prior art, it is necessary to provide an annular undercut wax injection mold.

[0004] An annular undercut wax injection mold, characterized in that it includes a lower template and an upper template. A cavity is provided on the upper side of the lower template, a moving cavity is provided on the lower side of the lower template, a moving mold core is provided in the moving cavity, an annular groove is provided on the outer side of the moving mold core, an elastic member is provided between the moving mold core and the moving cavity, a communication groove communicating with the moving cavity is provided on the upper side of the lower template, and a lifter corresponding to the communication groove is provided at the bottom of the upper template. When the upper template moves downward towards the lower template for mold closing, the lifter of the upper template is inserted into the communication groove, the lifter abuts against the moving mold core and compresses the elastic member, and the annular groove of the moving mold core moves. The annular groove of the moving mold forms an annular cavity for product forming with the cavity.

[0005] In one embodiment, a lower inclined surface is provided on one side of the moving mold core close to the communication groove, and a corresponding upper inclined surface is provided on the lower side of the lifter. When the upper template and the lower template are closed, the upper inclined surface of the lifter acts on the lower inclined surface of the moving mold core, so that the moving mold core moves and compresses the elastic member.

[0006] In one embodiment, at least one moving mold core is provided.

[0007] In one embodiment, a top plate is provided on the lower side of the lower template, a lifter pin is provided on the upper side of the top plate, a T-shaped block is provided on the upper side of the top plate, a T-shaped groove corresponding to the T-shaped block is provided on the lower side of the lifter pin, the lifter seat is arranged on the upper side of the T-shaped block through the T-shaped groove, and the upper side of the lifter pin passes through the lower template to the upper side of the lower template.

[0008] In one embodiment, inclined core parts adapted to the inner cavity of the product are provided on the top and the outer side of the lifter pin, and the inclined core parts and the cavity form an inner surface that fits the product.

[0009] In one embodiment, there are two moving core molds, which are respectively located on both sides of the communication groove. The inclined ejector pin is located on the side between the two moving core molds. An outer annular groove is provided on the outer side of the inclined ejector base. The outer annular groove and the annular groove of the moving core mold form an outer annular groove adapted to the inner annular groove of the product.

[0010] In one embodiment, a positioning groove is provided on the outer side of the moving core mold, and the end of the elastic member is clamped in the positioning groove.

[0011] In one embodiment, a moving groove is provided on the upper side of the lower template. A round hole core is provided in the moving groove. The round hole core has a cylindrical portion. An elastic member is provided between the round hole core and the side wall of the moving groove. The upper template is provided with a second pressing member. When the upper template and the lower template are closed, the second pressing member acts on the round hole core, so that the cylindrical portion of the round hole core moves to the cavity, thereby forming a side wall hole of the product after molding.

[0012] In one embodiment, the contact surface between the second pressing member and the round hole core is an inclined surface, so as to push the round hole core to move. The round hole core is provided with a limiting boss, and a limiting block is provided on the upper side of the lower template. The limiting block is located above the limiting boss, so as to limit the round hole core on the upper side of the lower template.

[0013] In one embodiment, a core-pulling cylinder is provided on the outer side of the lower template. A moving outer core fixed to the piston rod of the core-pulling cylinder is provided on the side of the lower template. The moving outer core is provided with a through hole. A moving inner core is provided at the position of the through hole. An annular groove is formed between the moving inner core and the moving outer core. The annular groove is arranged on the outer side of the cavity and communicates with the cavity.

[0014] In the above annular undercut wax injection mold, when the mold is closed, the moving core mold moves to a preset position, so that the annular groove of the moving core mold moves outward. In this way, an annular cavity corresponding to the product is formed between the annular groove of the moving core mold and the cavity. After the wax injection is completed, the moving core mold moves horizontally under the action of the elastic member, so that the moving core mold is separated from the molded product. The movement of the moving core mold is controlled by the elastic member and the lifter of the upper template, without the need for additional manual taking, realizing automation in the wax injection process and improving production efficiency. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the overall structure of the annular undercut wax injection mold of the present invention;

[0016] Figure 2 It is a schematic diagram of the structure of the product and the lower template when the annular undercut wax injection mold of the present invention is opened;

[0017] Figure 3 It is a schematic diagram of the structure of the lower template of the annular undercut wax injection mold of the present invention;

[0018] Figure 4 This is a schematic diagram of the structure of the lower template of the annular undercut wax injection mold of the utility model;

[0019] Figure 5 This is a schematic diagram of the lower template structure of the annular undercut wax injection mold of the utility model;

[0020] Figure 6 This is a schematic diagram of the structure of the lower template of the annular undercut wax injection mold of the utility model;

[0021] Figure 7 This is a schematic diagram of the lower template structure of the annular undercut wax injection mold of the utility model;

[0022] Figure 8 This is a schematic diagram of the upper template structure of the annular undercut wax injection mold of the utility model;

[0023] Figure 9 This is a schematic diagram of the circular hole core structure of the annular undercut wax injection mold of the utility model;

[0024] Figure 10 This is a schematic diagram of the movable mold core structure of the annular undercut wax injection mold of the utility model;

[0025] Figure 11 This is a cross-sectional structural diagram of the annular undercut wax injection mold of the utility model;

[0026] Among them, 1. lower template; 2. upper template; 3. cavity; 4. movable cavity; 5. movable mold core; 51. annular groove; 52. positioning groove; 6. connecting groove; 7. shovel; 8. ejector plate; 9. inclined ejector pin; 91. inclined core part; 92. outer annular groove; 10. movable outer core; 11. movable groove; 12. round hole core; 13. cylindrical part; 14. limit block; 21. second pressing piece; 100. product. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0028] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. On the contrary, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this utility model belongs. The terms used in the description of this utility model herein are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0030] As Figures 1 to 10 As shown, a ring-shaped reverse-injection wax mold is characterized in that it includes a lower template 1 and an upper template 2. A cavity 3 is provided on the upper side of the lower template 1, a moving cavity 4 is provided on the lower side of the lower template 1, a moving die core 5 is provided in the moving cavity 4, an annular groove 51 is provided on the outer side of the moving die core 5, an elastic member is provided between the moving die core 5 and the moving cavity 4, a communicating groove 6 communicating with the moving cavity 4 is provided on the upper side of the lower template 1, and a lifter 7 corresponding to the communicating groove 6 is provided at the bottom of the upper template 2. When the upper template 2 moves downward to close the mold, the lifter 7 of the upper template 2 is inserted into the communicating groove 6, the lifter 7 abuts against the moving die core 5 and compresses the elastic member, and the annular groove 51 of the moving die core 5 moves. The annular groove 51 of the moving die forms an annular cavity for the product 100 to be molded with the cavity 3.

[0031] During mold closing, the moving die core 5 moves to a preset position, so that the annular groove 51 of the moving die core 5 moves outward, so that an annular cavity corresponding to the product 100 is formed between the annular groove 51 of the moving die core 5 and the cavity 3. After wax injection is completed, the moving die core 5 moves horizontally under the action of the elastic member, so that the moving die core 5 is separated from the molded product 100. The movement of the moving die core 5 is controlled by the elastic member and the lifter 7 of the upper template 2, without the need for manual taking, realizing automation in the wax injection process and improving production efficiency.

[0032] When moving the movable core 5 during the mold closing process, it is moved by the action of the lifter 7. Therefore, in this embodiment, in order to enable the lifter 7 to better drive the movable core 5 to move when contacting the movable core 5, a lower inclined surface is provided on one side of the movable core 5 close to the communication groove 6, and a corresponding upper inclined surface is provided on the lower side of the lifter 7. When the upper template 2 and the lower template 1 are closed, the upper inclined surface of the lifter 7 acts on the lower inclined surface of the movable core 5, so that the movable core 5 moves and compresses the elastic member. In the initial state, the elastic member is in a compressed state. Therefore, under the action of the elastic member, the movable core 5 moves towards the middle position of the communication groove 6. During mold closing, the lifter 7 of the upper template 2 acts on the position of the communication groove 6 of the lower template 1, so as to abut against the movable core 5, causing the movable core 5 to move towards the direction of compressing the elastic member until the mold closing is completed. At this time, the annular groove 51 of the movable core 5 and the cavity 3 of the lower template 1 together form an annular cavity corresponding to the product 100. After wax injection is completed, the upper template 2 and the lower template 1 are separated, so that the lifter 7 of the upper template 2 moves out from the position of the communication groove 6 of the lower template 1. Under the action of the elastic member, the movable core 5 moves towards the middle position of the communication groove 6. In this way, the annular groove 51 of the movable core 5 is separated from the groove of the product 100 after molding, which is convenient for taking out the molded product 100.

[0033] At this time, the number of movable cores 5 can be set according to the specific shape of the product 100, and then the grooves on the outer side of the product 100 are divided into multiple parts, corresponding to different movable cores 5 respectively, so as to realize the molding of the product 100. Therefore, in this embodiment, at least one movable core 5 is provided.

[0034] The molding of the groove on the outer side of the product 100 can be realized through the movable core 5, but the product 100 is not convenient to eject after molding. Therefore, in this embodiment, a top plate 8 is provided on the lower side of the lower template 1, a lifter pin 9 is provided on the upper side of the top plate 8, a T-shaped block is provided on the upper side of the top plate 8, a T-shaped groove corresponding to the T-shaped block is provided on the lower side of the lifter pin 9, the lifter seat is arranged on the upper side of the T-shaped block through the T-shaped groove, and the upper side of the lifter pin 9 passes through the lower template 1 to the upper side of the lower template 1. In this way, after mold opening, the lifter pin 9 can eject the molded product 100 located at the position of the upper template 2.

[0035] Furthermore, since the lifter pin 9 will move horizontally when ejecting the product 100 during mold opening, in this embodiment, inclined core parts 91 adapted to the inner cavity of the product 100 are provided on the top and the outer side of the lifter pin 9, and the inclined core parts 91 and the cavity 3 form an inner surface that fits the product 100. At this time, the top and the outer side of the lifter pin 9 have the same shape as the inner surface of the product 100. Therefore, the lifter pin 9 at this time also has the function of a core for the molding of the product 100.

[0036] At this time, there are two moving core molds 5, which are respectively located on both sides of the communication groove 6. The inclined ejector pin 9 is located on the side between the two moving core molds 5. An outer annular groove 92 is provided on the outer side of the inclined ejector seat. The outer annular groove 92 and the annular groove 51 of the moving core mold 5 form an outer annular groove adapted to the inner annular groove of the product 100. At this time, since the annular groove 51 on the inner side of the product 100 is relatively long, it needs to be produced in sections. At this time, by combining the inclined ejector pin 9 with the moving core mold 5, the production of the annular groove 51 of the product 100 with large size and large arc can be realized.

[0037] Since the moving core mold 5 returns to its initial position through an elastic member, in order to ensure the correct moving direction of the moving core mold 5, in this embodiment, a positioning groove 52 is provided on the outer side of the moving core mold 5, and the end of the elastic member is clamped in the positioning groove 52. At the same time, a guiding groove for the movement of the moving core mold 5 is provided on the inner side of the lower mold, further improving the accuracy of the position of the moving core mold 5, thereby improving the precision of the product 100.

[0038] At this time, a through hole or a counterbore is provided on the outer side of the product 100. For the convenience of production, in this embodiment, a moving groove 11 is provided on the upper side of the lower template 1. A round hole core 12 is provided in the moving groove 11. The round hole core 12 is provided with a cylindrical portion 13. An elastic member is provided between the round hole core 12 and the side wall of the moving groove 11. The upper template 2 is provided with a second pressing member 21. When the upper template 2 and the lower template 1 are closed, the second pressing member 21 acts on the round hole core 12, so that the cylindrical portion 13 of the round hole core 12 moves to the cavity 3, thereby forming a side wall hole of the product 100 after molding. Under the action of the second pressing member 21, the round hole core 12 moves horizontally, so as to abut against the cavity 3 of the lower template 1. After the wax injection is completed and the mold is opened, under the action of the elastic member, the round hole core 12 moves out of the position of the formed through hole or counterbore, thereby realizing the production of the outer hole.

[0039] Similarly, in order to enable the round hole core 12 to move when the upper template 2 and the lower template 1 are closed, in this embodiment, the contact surface between the second pressing member 21 and the round hole core 12 is an inclined surface, so as to push the round hole core 12 to move. The round hole core 12 is provided with a limiting boss, and a limiting block 14 is provided on the upper side of the lower template 1. The limiting block 14 is located above the limiting boss, so as to limit the round hole core 12 on the upper side of the lower template 1. Under the action of the limiting block 14, the round hole core 12 can now move under the limiting block 14, so as to prevent the round hole core 12 from separating from the upper template 2 during the movement. At the same time, setting the contact surface between the second pressing member 21 and the round hole core 12 as an inclined surface can facilitate the pushing of the round hole core 12 during the mold closing process.

[0040] At this time, a circular hole is also provided on the outer side of the product 100. For simultaneous production, in this embodiment, a core-pulling cylinder is provided on the outer side of the lower template 1. A movable outer core 10 fixed to the piston rod of the core-pulling cylinder is provided on the side of the lower template 1. The movable outer core 10 is provided with a through hole, and a movable inner core is provided at the position of the through hole. An annular groove is formed between the movable inner core and the movable outer core 10. The annular groove is arranged on the outer side of the cavity 3 and communicates with the cavity 3. Under the action of the core-pulling cylinder, the movable outer core 10 and the movable inner core move synchronously, so as to be used for the molding of the product 100 and the removal of the movable outer core 10 after molding, improving the production efficiency.

[0041] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0042] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. A ring-shaped undercut wax injection mold, characterized in that: It includes a lower template and an upper template, wherein the upper side of the lower template is provided with a molding cavity, the lower side of the lower template is provided with a movable cavity, the movable mold core is provided in the movable cavity, the outer side of the movable mold core is provided with an annular groove, an elastic member is provided between the movable mold core and the movable cavity, the upper side of the lower template is provided with a connecting groove connected with the movable cavity, and the bottom of the upper template is provided with a shovel corresponding to the connecting groove. When the upper template is moved toward the lower template for mold closing, the shovel of the upper template is inserted into the connecting groove, the shovel abuts against the movable mold core and compresses the elastic member, the annular groove of the movable mold core moves, and the annular groove of the movable mold core and the molding cavity form an annular cavity for product molding.

2. The annular undercut wax injection mold according to claim 1, characterized in that: The movable mold core is provided with a lower inclined surface on one side close to the connecting groove, and the lower side of the shovel machine is provided with a corresponding upper inclined surface. When the upper mold plate is molded with the lower mold plate, the upper inclined surface of the shovel machine acts on the lower inclined surface of the movable mold core, thereby causing the movable mold core to move and compress the elastic part.

3. The annular undercut wax injection mold according to claim 2, characterized in that: The movable mold core is provided with at least one.

4. The annular undercut wax injection mold according to claim 3, characterized in that: A top plate is provided on the lower side of the lower template, an inclined ejector pin is provided on the upper side of the top plate, a T-block is provided on the upper side of the top plate, a T-slot corresponding to the T-block is provided on the lower side of the inclined ejector pin, the inclined ejector pin is arranged on the upper side of the T-block through the T-slot, and the upper side of the inclined ejector pin passes through the lower template to the upper side of the lower template.

5. The annular undercut wax injection mold according to claim 4, characterized in that: The top and outer side of the inclined ejector pin are provided with an inclined core portion adapted to the inner cavity of the product, and the inclined core portion and the cavity form an inner surface that fits the product.

6. The annular undercut wax injection mold according to claim 5, characterized in that: The movable mold cores are provided with two, which are respectively located at the two sides of the connecting groove. The inclined ejector pin is located at the side between the two movable mold cores. An outer annular groove is provided on the outer side of the inclined ejector pin. The outer annular groove and the annular groove of the movable mold core form an outer annular groove that is adapted to the inner annular groove of the product.

7. The annular undercut wax injection mold according to any one of claims 1 to 6, characterized in that: A positioning groove is arranged on the outer side of the movable mold core, and the end of the elastic member is clamped in the positioning groove.

8. The annular undercut wax injection mold according to any one of claims 1 to 6, characterized in that: A movable groove is provided on the upper side of the lower template, a circular hole core is provided in the movable groove, a cylindrical portion is provided on the circular hole core, elastic parts are provided on the circular hole core and the side wall of the movable groove, and the upper template is provided with a second pressing part. When the upper template and the lower template are closed, the second pressing part acts on the circular hole core to move the cylindrical portion of the circular hole core to the cavity, thereby forming a side wall hole of the product after molding.

9. The annular undercut wax injection mold according to claim 8, characterized in that: The contact surface between the second pressing piece and the round hole core is an inclined surface, thereby pushing the round hole core to move. The round hole core is provided with a limiting boss, and a limiting block is provided on the upper side of the lower template. The limiting block is located on the upper side of the limiting boss, thereby limiting the round hole core on the upper side of the lower template.

10. The annular undercut wax injection mold according to any one of claims 1 to 6, characterized in that: A core-pulling cylinder is provided on the outer side of the lower template, and a movable outer core fixed to the piston rod of the core-pulling cylinder is provided on the side of the lower template. The movable outer core is provided with a through hole, and a movable inner core is provided at the position of the through hole. An annular groove is formed between the movable inner core and the movable outer core, and the annular groove is arranged on the outer side of the cavity and communicates with the cavity.

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