A mold for the undercut features of product demolding

Abstract

The present invention discloses a mold for a product demolding undercut feature, which includes an upper mold and a lower mold. When the upper mold and the lower mold are closed, they can enclose a product wax injection cavity. A first movable cavity is provided at the left end of the product wax injection cavity. Inside the first movable cavity, there are a driving block, a first structural block, and a first driving device that can drive the driving block and the first structural block to move. The driving block is arranged to the left of the first structural block; a first through hole running through from left to right is provided in the middle of the driving block, and the right end of the driving block is provided with a right end portion that gradually narrows to the right. A plurality of chutes extending to the right and gradually approaching the first through hole are provided on the side wall of the right end portion. A connecting rod extending to the left is provided in the middle of the left end of the first structural block, and the connecting rod is inserted into the first through hole to the left. A plurality of movable blocks are provided to the left of the first structural block, and sliding blocks adapted to the chutes are provided on the movable blocks. The structure of the present invention is reasonably designed, eliminating the manual process of disassembling the movable blocks, and improving the production efficiency and product yield.

Description

Technical Field

[0001] The present invention relates to the technical field of wax injection molds, and in particular to a mold for product demolding undercut features. Background Art

[0002] Refer to Figure 7 , when the product (17) is wax injection molded in the mold, an intermediate movable block (18) and several edge movable blocks (19) are required to construct the internal shape of the product (17). After the product (17) is wax injection molded, the product (17) needs to be demolded from the mold. The demolding process includes separating the intermediate movable block (18) and the edge movable blocks (19) from the inside of the product (17), that is, the product demolding undercut feature.

[0003] Currently, the product demolding undercut feature adopts a manual disassembly demolding method, with low production efficiency and a risk of deformation of the wax part (the wax part is the product) during manual disassembly of the intermediate movable block (18). Because it is easy to squeeze the two side edge movable blocks (19) when disassembling the intermediate movable block (18), it will cause the wax part to be pulled and deformed, thus resulting in a risk of deformation of the wax part. Summary of the Invention

[0004] The purpose of the present invention is to provide a mold for product demolding undercut features to solve the technical problems in the prior art that the product demolding undercut feature adopts a manual disassembly demolding method, with low production efficiency and a risk of deformation of the wax part (the wax part is the product) during manual disassembly of the intermediate movable block.

[0005] To achieve the above purpose, the technical solution of the present invention provides a mold for product demolding undercut features, including an upper mold and a lower mold. When the upper mold and the lower mold are closed, they can enclose a product wax injection cavity. A first movable cavity is provided at the left end of the product wax injection cavity. A driving block, a first structure block, and a first driving device capable of driving the driving block and the first structure block to move are provided inside the first movable cavity. The driving block is arranged to the left of the first structure block; a first through hole penetrating left and right is provided in the middle of the driving block, and a right end portion gradually narrowing to the right is provided at the right end of the driving block. A plurality of chutes extending to the right and gradually approaching the first through hole are provided on the side wall of the right end portion. A connecting rod extending to the left is provided in the middle of the left end of the first structure block. The connecting rod is inserted into the first through hole to the left. A plurality of movable blocks are provided to the left of the first structure block. Sliders adapted to the chutes are provided on the movable blocks. The movable blocks can slide along the chutes, and the left end edge of the first structure block restricts the rightward movement of the movable blocks.

[0006] Furthermore, a limiting block is provided inside the first movable cavity. A second through hole penetrating left and right is provided in the middle of the limiting block. A fixing plate extending vertically is provided at the left end opening of the limiting block. A limiting groove is provided at the left end of the driving block. The left end of the driving block is inserted into the second through hole. The fixing plate is arranged in the limiting groove. The front and rear side walls of the limiting groove extend leftward from the front and rear of the fixing plate respectively. The left end of the connecting rod passes through the limiting groove leftward and is fixedly connected to the fixing plate. The right end edge of the limiting block restricts the leftward movement of the movable block.

[0007] Furthermore, a first connecting plate is provided to the left of the limiting block and the fixing plate. The front and rear side walls of the limiting groove extend leftward from the front and rear of the fixing plate respectively and are fixedly connected to the right end of the first connecting plate. The width between the right side wall of the limiting groove and the first connecting plate is greater than the width of the fixing plate in the left-right direction. The first driving device is the first piston rod of the first oil cylinder. The left end of the first connecting plate is connected to the first piston rod of the first oil cylinder. The first piston rod can drive the first connecting plate to move left and right.

[0008] Furthermore, the width of the limiting block is greater than the width of the left end opening of the product wax injection cavity to prevent the limiting block from entering the product wax injection cavity. The limiting block is set as a rectangular body. The shape of the first through hole is set as a prism type. The shape of the driving block is set as a prism type adapted to the first through hole to prevent relative rotation between the limiting block and the first through hole. The shape of the right end portion is set as a frustum type that gradually narrows to the right.

[0009] Furthermore, the shape of the second through hole is set as a prism type. The shape of the connecting rod is set as a prism type adapted to the second through hole to prevent relative rotation between the connecting rod and the second through hole.

[0010] Furthermore, a second movable cavity is provided at the right end of the product wax injection cavity. There is an included angle between the second movable cavity and the first movable cavity. A second structural block and a second driving device capable of driving the second structural block to move are provided inside the second movable cavity. The second structural block and the first structural block can move into the product wax injection cavity and fit together.

[0011] Furthermore, a second connecting plate is provided at the end of the second structural block away from the product wax injection cavity. The second driving device is the second piston rod of the second oil cylinder. The end of the second connecting plate away from the second structural block is connected to the second piston rod of the second oil cylinder.

[0012] Furthermore, the width of the second connecting plate is greater than the width of the right end opening of the product wax injection cavity to prevent the second connecting plate from entering the product wax injection cavity.

[0013] Furthermore, a number of third structural blocks are provided on the inner wall of the product wax injection cavity.

[0014] Furthermore, a runner extending outward is provided on the inner wall of the wax injection cavity of the product.

[0015] In summary, by applying the technical solution of the present invention, the following beneficial effects are achieved: The structure of the present invention is reasonably designed. (1) By including an upper mold and a lower mold, the upper mold and the lower mold can enclose a wax injection cavity of the product when the molds are closed. A first movable cavity is provided at the left end of the wax injection cavity of the product. A driving block, a first structural block, and a first driving device capable of driving the driving block and the first structural block to move are provided inside the first movable cavity. The driving block is arranged to the left of the first structural block. Thus, the driving block and the first structural block can be driven by the first driving device to enter the wax injection cavity of the product from the first movable cavity, and the driving block and the first structural block can also be driven by the first driving device to retreat from the wax injection cavity of the product back to the first movable cavity. (2) A first through hole penetrating left and right is provided in the middle of the driving block. The right end of the driving block is provided with a right end portion that gradually narrows to the right. A plurality of chutes extending to the right and gradually approaching the first through hole are provided on the side wall of the right end portion. A connecting rod extending to the left is provided in the middle of the left end of the first structural block. The connecting rod is inserted into the first through hole to the left. A plurality of movable blocks are provided to the left of the first structural block. Sliders adapted to the chutes are provided on the movable blocks. The movable blocks can slide along the chutes. The left end edge of the first structural block restricts the rightward movement of the movable blocks. Thus, after the driving block and the first structural block are driven by the first driving device to enter the wax injection cavity of the product from the first movable cavity, the first structural block remains relatively stationary, and the driving block moves closer to the first structural block to the right. As a result, the movable blocks expand outward due to the compression of the left and right spaces, thereby completing the construction of the internal shape of the product by the movable blocks. When the reverse buckling feature of the product needs to be demolded, the first structural block still remains relatively stationary, and the first driving device drives the driving block to move away from the first structural block to the left. As a result, the movable blocks contract inward due to the expansion of the left and right spaces. Then, the first driving device drives the driving block, the first structural block, and the movable blocks to retreat from the wax injection cavity of the product back to the first movable cavity, and the reverse buckling feature of the product is completed. From the above analysis, it can be seen that the present invention eliminates the manual disassembly process of the movable blocks. Moreover, when the first driving device drives the driving block to move away from the first structural block to the left, the movable blocks will contract inward due to the expansion of the left and right spaces. Therefore, the movable blocks will not be squeezed by the driving block to cause the wax part to be pulled and deformed. Therefore, the present invention can reduce the risk of wax part deformation and improve production efficiency and product yield. Description of the Drawings

[0016] Figure 1 is an exploded structural schematic diagram of the present invention when the upper mold and the lower mold are removed;

[0017] Figure 2 is Figure 1 an exploded structural schematic diagram of the first part in

[0018] Figure 3 isFigure 1 Explosion structure schematic diagram of the second part in

[0019] Figure 4 is Figure 1 Explosion structure schematic diagram of the third part in

[0020] Figure 5 Stereo structure schematic diagram of the present invention when removing the upper die and the lower die;

[0021] Figure 6 Cross-sectional structure schematic diagram of the present invention;

[0022] Figure 7 Explosion structure schematic diagram of the product of the prior art when cooperating with the middle movable block and the edge movable block;

[0023] Explanation of reference numerals: 1 - lower die, 2 - product wax injection cavity, 3 - first movable cavity; 4 - driving block, 401 - first through hole, 402 - right end, 403 - chute, 404 - limiting groove; 5 - first structural block, 501 - connecting rod; 6 - movable block, 601 - slider; 7 - limiting block, 701 - second through hole; 8 - fixing plate, 9 - first connecting plate, 10 - first piston rod, 11 - second movable cavity, 12 - second structural block, 13 - second connecting plate, 14 - second piston rod, 15 - third structural block, 16 - runner; 17 - product, 18 - middle movable block, 19 - edge movable block. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention, but it does not constitute a limitation on the protection scope of the present invention.

[0025] In the present invention, for a clearer description, the following explanations are made: The observer observes facing the attached Figure 1 For observation, the left side of the observer is set as left, the right side of the observer is set as right, the front of the observer is set as front, the rear of the observer is set as rear, the upper side of the observer is set as upper, and the lower side of the observer is set as lower. It should be noted that the terms "front end", "rear end", "left side", "right side", "middle part", "upper side", "lower side", etc. in the text indicate the orientation or position relationship based on the orientation or position relationship set in the accompanying drawings, and are only for the purpose of clearly describing the present invention, rather than indicating or implying that the structures or components referred to must have a specific orientation and be constructed in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", "fourth" are only used for the purpose of clear or simplified description, and cannot be understood as indicating or implying relative importance or quantity.

[0026] See Figures 1 to 7, this embodiment provides a mold for the undercut feature of product demolding, including an upper mold and a lower mold 1. When the upper mold and the lower mold 1 are closed, they can enclose a product wax injection cavity 2. A first movable cavity 3 is provided at the left end of the product wax injection cavity 2. Inside the first movable cavity 3, there are a driving block 4, a first structural block 5, and a first driving device that can drive the driving block 4 and the first structural block 5 to move. The driving block 4 is arranged to the left of the first structural block 5; a first through hole 401 that penetrates left and right is provided in the middle of the driving block 4. The right end of the driving block 4 has a right end portion 402 that gradually narrows to the right. The side wall of the right end portion 402 is provided with a plurality of chutes 403 that extend to the right and gradually approach the first through hole 401. In the middle of the left end of the first structural block 5, there is a connecting rod 501 that extends to the left. The connecting rod 501 is inserted into the first through hole 401 to the left. A plurality of movable blocks 6 are provided to the left of the first structural block 5. The movable blocks 6 are provided with sliders 601 that are adapted to the chutes 403. The movable blocks 6 can slide along the chutes 403. The left end edge of the first structural block 5 restricts the rightward movement of the movable blocks 6. Function: (1) By including an upper mold and a lower mold, when the upper mold and the lower mold are closed, they can enclose a product wax injection cavity. A first movable cavity is provided at the left end of the product wax injection cavity. Inside the first movable cavity, there are a driving block, a first structural block, and a first driving device that can drive the driving block and the first structural block to move. The driving block is arranged to the left of the first structural block; thus, the driving block and the first structural block can be driven by the first driving device to enter the product wax injection cavity from the first movable cavity, and the driving block and the first structural block can also be driven by the first driving device to retreat from the product wax injection cavity back to the first movable cavity; (2) By providing a first through hole that penetrates left and right in the middle of the driving block, a right end portion that gradually narrows to the right at the right end of the driving block, a plurality of chutes that extend to the right and gradually approach the first through hole on the side wall of the right end portion, a connecting rod that extends to the left in the middle of the left end of the first structural block, the connecting rod is inserted into the first through hole to the left, a plurality of movable blocks are provided to the left of the first structural block, the movable blocks are provided with sliders that are adapted to the chutes, and the movable blocks can slide along the chutes. The left end edge of the first structural block restricts the rightward movement of the movable blocks; thus, after the driving block and the first structural block are driven by the first driving device to enter the product wax injection cavity from the first movable cavity, the first structural block remains relatively stationary, and the driving block moves closer to the first structural block to the right, so that the movable blocks expand outward due to the compression of the left and right spaces, thereby completing the construction of the internal shape of the product by the movable blocks; and when the undercut feature of the product demolding is required, the first structural block still remains relatively stationary, the first driving device drives the driving block to move away from the first structural block to the left, so that the movable blocks contract inward due to the expansion of the left and right spaces. Then, the first driving device drives the driving block, the first structural block, and the movable blocks to retreat from the product wax injection cavity back to the first movable cavity, and the undercut feature of the product demolding is completed.As can be seen from the above analysis, the present invention cancels the manual disassembly process of the movable block. When the driving block is driven by the first driving device to move leftward away from the first structural block, the movable block will contract inward due to the enlarged left and right spaces. Therefore, the movable block will not be squeezed by the driving block to cause the wax part to be pulled and deformed. Therefore, the present invention can reduce the risk of wax part deformation and improve production efficiency and product yield.

[0027] Specifically, a limiting block 7 is further provided inside the first movable cavity 3. A second through hole 701 penetrating left and right is provided in the middle of the limiting block 7. A fixing plate 8 extending vertically is provided at the left end opening of the limiting block 7. A limiting groove 404 is provided at the left end of the driving block 4. The left end of the driving block 4 is inserted into the second through hole 701. The fixing plate 8 is arranged in the limiting groove 404. The front and rear side walls of the limiting groove 404 extend leftward from the front and rear of the fixing plate 8 respectively. The left end of the connecting rod 501 passes through the limiting groove 404 leftward and is fixedly connected to the fixing plate 8. The right end edge of the limiting block 7 restricts the leftward movement of the movable block 6. Function: The setting of the limiting block 7 can, on the one hand, cooperate with the first structural block 5 to limit the left and right movement of the movable block 6, and on the other hand, can guide the driving block 4. The setting of the fixing plate can limit the leftward movement of the limiting groove 404 and the driving block 4 to prevent the distance between the driving block 4 and the first structural block 5 from being too far.

[0028] Specifically, a first connecting plate 9 is provided to the left of the limiting block 7 and the fixing plate 8. The front and rear side walls of the limiting groove 404 extend leftward from the front and rear of the fixing plate 8 respectively and are fixedly connected to the right end of the first connecting plate 9. The width between the right side wall of the limiting groove 404 and the first connecting plate 9 is greater than the left-right width of the fixing plate 8. The first driving device is the first piston rod 10 of the first oil cylinder. The left end of the first connecting plate 9 is connected to the first piston rod 10 of the first oil cylinder. The first piston rod 10 can drive the first connecting plate 9 to move left and right. Function: Through the setting of the first connecting plate 9, on the one hand, the fixing plate 8 is restricted to move left and right between the limiting groove 404 and the first connecting plate 9, so that the left and right movement of the driving block 4 relative to the limiting block 7 is restricted by the fixing plate 8; on the other hand, the first connecting plate can move left and right under the drive of the first piston rod 10, thereby driving the left and right movement of the driving block, the limiting block and the connecting rod. Through the cooperation of the limiting groove, the fixing plate and the first connecting plate, the first piston rod of the first oil cylinder becomes a power source that can drive the driving block, the first structural block and the limiting block.

[0029] Specifically, the width of the limit block 7 is greater than the width of the left end opening of the product wax injection cavity 2 to prevent the limit block 7 from entering the product wax injection cavity 2; the limit block 7 is provided as a rectangular body, the shape of the first through hole 401 is provided as a prism type, and the shape of the driving block 4 is provided as a prism type adapted to the first through hole 401 to prevent relative rotation between the limit block 7 and the first through hole 401; the shape of the right end portion 402 is provided as a frustum type that gradually narrows to the right. Function: Preventing relative rotation can make the left and right movement of the driving block more stable.

[0030] Specifically, the shape of the second through hole 701 is provided as a prism type, and the shape of the connecting rod 501 is provided as a prism type adapted to the second through hole 701 to prevent relative rotation between the connecting rod 501 and the second through hole 701. Function: Preventing relative rotation can make the left and right movement of the connecting rod more stable.

[0031] Specifically, a second movable cavity 11 is provided at the right end of the product wax injection cavity 2, and there is an included angle between the second movable cavity 11 and the first movable cavity 3; a second structural block 12 and a second driving device capable of driving the second structural block 12 to move are provided inside the second movable cavity 11, and the second structural block 12 and the first structural block 5 can move into the product wax injection cavity 2 and fit with each other. Function: Fitting can make the molded product have an inner cavity that penetrates from left to right.

[0032] Specifically, a second connecting plate 13 is provided at one end of the second structural block 12 away from the product wax injection cavity 2, the second driving device is the second piston rod 14 of the second oil cylinder, and one end of the second connecting plate 13 away from the second structural block 12 is connected to the second piston rod 14 of the second oil cylinder. Function: The second piston rod can drive the second connecting plate to move towards the product wax injection cavity, and then the second connecting plate drives the second structural block to move towards the product wax injection cavity.

[0033] Specifically, the width of the second connecting plate 13 is greater than the width of the right end opening of the product wax injection cavity 2 to prevent the second connecting plate 13 from entering the product wax injection cavity 2. Function: Avoiding the second structural block from going too deep into the product wax injection cavity 2 to limit the second structural block.

[0034] Specifically, several third structural blocks 15 are provided on the inner wall of the product wax injection cavity 2. Function: The third structural block 15 is an external feature mechanism of the product. Since it is not the main innovation point of the present invention and belongs to a common side core-pulling mechanism, it will not be elaborated in detail.

[0035] Specifically, a runner 16 extending outward is also provided on the inner wall of the product wax injection cavity 2. The specific position of the runner 16 can be selected according to actual needs.

[0036] Such as Figure 6 , the working principle of product wax injection is as follows:

[0037] First: The second piston rod 14 of the second oil cylinder drives the second connecting plate 13 to move towards the product wax injection cavity 2. At the same time, the second connecting plate 13 drives the second structural block 12 to move towards the product wax injection cavity 2, so that the second structural block 12 constructs the internal shape of the product 17.

[0038] Second: The first piston rod 10 of the first oil cylinder drives the first connecting plate 9 to move to the right. At the same time, the first connecting plate 9 drives the driving block 4 to move to the right. During the process of the driving block 4 moving to the right, the first connecting plate 9 on the left side of the limiting groove 404 by the fixed plate 8 is limited, so as to limit the distance of the driving block 4 approaching the first structural block 5;

[0039] Third: The movable block 6 expands outwards due to the compression of the left and right spaces, so that the movable block can construct the internal shape of the product subsequently.

[0040] Fourth: The driving block 4 continues to move to the right under the drive of the first connecting plate 9. The first connecting plate 9 also drives the fixed plate 8 to move to the right at the same time. The fixed plate 8 then drives the limiting block 7, the connecting rod 501, the first structural block 5, and the movable block 6 to move towards the product wax injection cavity 2, so that the driving block 4, the connecting rod 501, the first structural block 5, and the movable block 6 enter the inside of the product wax injection cavity 2.

[0041] Fifth: The first structural block 5 and the second structural block 12 form an engagement.

[0042] As Figure 6 , the working principle of product demolding is as follows:

[0043] First: The second piston rod 14 of the second oil cylinder drives the second connecting plate 13 to retreat towards the second moving cavity 11. At the same time, the second connecting plate 13 drives the second structural block 12 to retreat towards the second moving cavity 11, so that the second structural block 12 disengages from the inside of the product 17.

[0044] Second: The first piston rod 10 of the first oil cylinder drives the first connecting plate 9 to move to the left. At the same time, the first connecting plate 9 drives the driving block 4 to move to the left. During the process of the driving block 4 moving to the left, the first connecting plate 9 is limited by the fixed plate 8 to the limiting groove 404, so as to limit the amplitude of the driving block 4 moving away from the first structural block 5.

[0045] Third: The movable block 6 contracts inwards due to the expansion of the left and right spaces, so that the movable block 6 is disengaged from the inside of the product 17.

[0046] Fourth: The driving block 4 continues to move leftward under the drive of the first connecting plate 9, thereby driving the fixing plate 8 to move leftward. The fixing plate 8 then drives the limiting block 7, the connecting rod 501, the first structural block 5, and the movable block 6 to retract toward the first movable cavity 3, so that the driving block 4, the connecting rod 501, the first structural block 5, and the movable block 6 are disengaged from the interior of the product 17.

[0047] Fifth: Finally, the product 17 is completely withdrawn.

[0048] The demolding undercut feature of the present invention adopts a side-pulling and inner-retracting structure, eliminating the manual disassembly process of the movable block, and improving the production efficiency and product yield.

[0049] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A mold for the undercut feature of product demolding, comprising an upper mold and a lower mold (1). When the upper mold and the lower mold (1) are closed, they can enclose a product wax injection cavity (2). It is characterized in that: At the left end of the product wax injection cavity (2), there is a first movable cavity (3). Inside the first movable cavity (3), there are a driving block (4), a first structural block (5), and a first driving device capable of driving the driving block (4) and the first structural block (5) to move. The driving block (4) is located to the left of the first structural block (5). A first through hole (401) running through from left to right is provided in the middle of the driving block (4). The right end of the driving block (4) has a right end portion (402) that gradually narrows towards the right. The side wall of the right end portion (402) is provided with a plurality of chutes (403) that extend to the right and gradually converge towards the first through hole (401). In the middle of the left end of the first structural block (5), there is a connecting rod (501) that extends to the left. The connecting rod (501) is inserted into the first through hole (401) to the left. To the left of the first structural block (5), there are a plurality of movable blocks (6). The movable blocks (6) are provided with sliders (601) adapted to the chutes (403). The movable blocks (6) can slide along the chutes (403). The left end edge of the first structural block (5) restricts the rightward movement of the movable blocks (6). At the right end of the product wax injection cavity (2), there is a second movable cavity (11). There is an angle between the second movable cavity (11) and the first movable cavity (3). Inside the second movable cavity (11), there is a second structural block (12) and a second driving device capable of driving the second structural block (12) to move. The second structural block (12) and the first structural block (5) can move into the product wax injection cavity (2) and fit together with each other. One end of the second structural block (12) far from the product wax injection cavity (2) is provided with a second connecting plate (13). The second driving device is the second piston rod (14) of a second oil cylinder. One end of the second connecting plate (13) far from the second structural block (12) is connected to the second piston rod (14) of the second oil cylinder. The inner wall of the product wax injection cavity (2) is provided with a plurality of third structural blocks (15).

2. The mold for the product demolding undercut feature according to claim 1, wherein: Inside the first movable cavity (3), there is also a limit block (7). A second through hole (701) running through from left to right is provided in the middle of the limit block (7). The left end opening of the limit block (7) is provided with a fixing plate (8) extending vertically. A limit groove (404) is provided at the left end of the driving block (4). The left end of the driving block (4) is inserted into the second through hole (701). The fixing plate (8) is located in the limit groove (404). The front and rear side walls of the limit groove (404) extend to the left from the front and rear of the fixing plate (8) respectively. The left end of the connecting rod (501) passes through the limit groove (404) to the left and is fixedly connected to the fixing plate (8). The right end edge of the limit block (7) restricts the leftward movement of the movable blocks (6).

3. The mold for the product demolding undercut feature according to claim 2, characterized in that: A first connecting plate (9) is provided to the left of the limit block (7) and the fixing plate (8). The front and rear side walls of the limit groove (404) extend leftward from the front and rear of the fixing plate (8) respectively and are fixedly connected to the right end of the first connecting plate (9). The width between the right side wall of the limit groove (404) and the first connecting plate (9) is greater than the left-right width of the fixing plate (8). The first driving device is the first piston rod (10) of the first oil cylinder. The left end of the first connecting plate (9) is connected to the first piston rod (10) of the first oil cylinder, and the first piston rod (10) can drive the first connecting plate (9) to move left and right.

4. The mold for the product demolding undercut feature according to claim 2, characterized in that: The width of the limit block (7) is greater than the left end opening width of the product wax injection cavity (2) to prevent the limit block (7) from entering the product wax injection cavity (2). The limit block (7) is provided as a rectangular body. The shape of the first through hole (401) is provided as a prism shape, and the shape of the driving block (4) is provided as a prism shape adapted to the first through hole (401) to prevent relative rotation between the limit block (7) and the first through hole (401). The shape of the right end portion (402) is provided as a frustum shape that gradually narrows to the right.

5. The mold for the product demolding undercut feature according to claim 2, characterized in that: The shape of the second through hole (701) is provided as a prism shape, and the shape of the connecting rod (501) is provided as a prism shape adapted to the second through hole (701) to prevent relative rotation between the connecting rod (501) and the second through hole (701).

6. The mold for the product demolding undercut feature according to claim 1, wherein: The width of the second connecting plate (13) is greater than the right end opening width of the product wax injection cavity (2) to prevent the second connecting plate (13) from entering the product wax injection cavity (2).

7. A mold for the demolding undercut feature of a product according to any one of claims 1 to 5, characterized in that: A runner (16) extending outward is further provided on the inner wall of the product wax injection cavity (2).

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