A composite motion secondary core-pulling mold structure
By using a compound motion secondary core-pulling mold structure and the coordinated design of the drive block and the limit block, a smooth demolding process with large-angle undercutting is achieved, which solves the problems of burrs and deformation in the demolding process of existing molds, improves product yield and reduces costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TONGDA XIAMEN TECH
- Filing Date
- 2025-12-30
- Publication Date
- 2026-06-30
AI Technical Summary
Existing molds are difficult to effectively avoid burrs, deformation and tearing at large-angle undercut positions during demolding. Moreover, existing solutions are costly, have complex control systems, occupy a lot of space, and are difficult to achieve smooth demolding with multi-directional and large-angle undercuts.
The mold adopts a compound motion secondary core-pulling structure. The drive block drives the sliding seat and ejector rod to perform multi-directional compound motion, which is divided into two strokes for secondary core pulling. Combined with the design of limit blocks and guide surfaces, the compactness and reliability of the mold are ensured.
It achieves smooth demolding with multi-directional and large-angle inverted clamping, improves product yield, avoids burrs and deformation, has a compact structure, and keeps costs under control.
Smart Images
Figure CN121492295B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of molds, and specifically to a composite motion secondary core-pulling mold structure. Background Technology
[0002] In the field of injection mold design and manufacturing, the design of the core-pulling mechanism is particularly crucial for products with undercut structures and those requiring core pulling at large angles and in multiple directions. The core-pulling mechanism is used to remove the mold components that form the undercut or recessed parts of the product during the mold opening process, allowing for smooth demolding.
[0003] In injection molding of products with multi-directional undercuts and curved surfaces, such as eyeglass frames, automotive interior parts, and appliance housings—for example, the temples of electronic eyeglass frames—the inclined portion at the end of the temple is tilted relative to the straight portion, with a significant angle between them in both the horizontal and vertical directions. Electronic components need to be installed within the inclined portion of the temple housing; therefore, an undercut exists at the end of the inclined portion. Typically, a single core-pulling action is used, taking advantage of the product's inherent deformation capacity. However, the mold core used to form the undercut often results in burrs, deformation, or even tearing at the undercut location during demolding, leading to a high product defect rate. Furthermore, while some solutions utilize multiple independent cylinders or motors for step-by-step core pulling, these are costly, involve complex control systems, and occupy a large space, hindering mold compactness and efficient production.
[0004] Therefore, there is an urgent need for a compact, reliable, and cost-controllable large-angle composite motion core-pulling mold structure that can achieve smooth demolding with multi-directional, large-angle undercutting without modifying the product design, while ensuring the surface quality and dimensional accuracy of the product. Summary of the Invention
[0005] To address the aforementioned problems, this invention provides a composite motion secondary core-pulling mold structure.
[0006] To achieve the above objectives, the technical solution provided by the present invention is as follows:
[0007] A composite motion secondary core-pulling mold structure includes:
[0008] Post-model kernel;
[0009] The first mold core includes a first ejector rod and a first insert that are fixedly connected to each other. The first ejector rod is slidably and obliquely inserted into the rear mold core, and the first insert is used to form a part of the product.
[0010] The second mold core includes a second ejector rod and a second insert that are fixedly connected to each other. The second ejector rod is slidably inclined through the first ejector rod, and there is an included angle between the two. The second insert is connected to the first insert in the mold-closed state and is used to form the undercut of the product.
[0011] A sliding seat is slidably disposed relative to the rear mold core, and its sliding direction is the same as the length direction of the first ejector rod; the lower end of the first ejector rod is fixedly connected to the sliding seat;
[0012] An ejector seat is slidably disposed relative to the rear mold core, and its sliding direction is parallel to the sliding direction of the sliding seat; a second ejector rod is slidably disposed through the sliding seat, and the lower end of the second ejector rod is slidably connected to the ejector seat;
[0013] The driving block is slidable up and down relative to the rear mold core. The driving block and the sliding seat are slidably connected by a sliding buckle structure. The up and down sliding of the driving block can be converted into the sliding of the sliding seat along the length direction of the first ejector rod through the sliding buckle structure.
[0014] A limiting block is vertically fixed to the driving block and moves up and down with it. The ejector seat has a limiting groove. The limiting block can be selectively inserted into or removed from the limiting groove to limit or release the sliding of the ejector seat relative to the rear mold core.
[0015] The connection between the second mold core and the ejector seat is configured such that when the driving block moves downward and causes the sliding seat to slide, if the limiting block is inserted into the limiting groove, the ejector seat is restricted from sliding, and the second ejector rod can translate relative to the ejector seat, driving the second insert to disengage from the product undercut direction; if the limiting block exits the limiting groove, the ejector seat is released from restriction and can slide together with the sliding seat.
[0016] Optionally, the sliding buckle structure includes a groove and a slider; the slider can slide in the groove; one of the groove and the slider is disposed on the drive block, and the other is disposed on the sliding seat; the length direction of the groove forms an angle with the sliding direction of the drive block, so that the drive block can drive the sliding seat to tilt and slide relative to the rear mold core when moving vertically.
[0017] Optionally, the ejector pin seat has an inclined first guide surface at the opening of the limiting groove on the side wall facing the driving block, for guiding the limiting block to be inserted into the limiting groove.
[0018] Optionally, the upper end of the limiting block is provided with an inclined second guide surface, which is used to cooperate with the first guide surface to be inserted into the limiting groove.
[0019] Optionally, the lower end of the second push rod is slidably connected to the push pin seat via a roller, and the push pin seat has a rolling groove for the roller to roll.
[0020] Optionally, it also includes at least one ejector pin, which is slidably inserted through the first mold core and its lower end is connected to the ejector pin seat. The upper end of the ejector pin can extend or retract relative to the first insert through the relative movement of the ejector pin seat and the sliding seat.
[0021] Optionally, the sliding seat is provided with a receiving groove, and the ejector pin seat is slidably fitted into the receiving groove.
[0022] Optionally, the sliding seat is provided with a guide post in the receiving groove facing the ejector seat, the guide post is slidably inserted into the ejector seat, and the length direction of the guide post is the same as the sliding direction of the sliding seat.
[0023] Optionally, it also includes a guide block fixedly disposed relative to the rear mold core, and a first sliding cavity and a second sliding cavity are formed between the guide block and the rear mold core, the first sliding cavity being used to accommodate and guide the sliding seat, and the second sliding cavity being used to accommodate and guide the ejector pin seat.
[0024] Optionally, it also includes multiple third mold cores; the third mold core includes a third ejector rod and a third insert that are fixedly connected to each other, the third ejector rod is movably inserted through the rear mold core, and the third insert is used to form a part of the product; the third ejector rod is movably inserted through the drive block, ejector seat and sliding seat or movably inserted through the drive block and ejector seat.
[0025] Optionally, the guide block and the rear mold core are both provided with a buffer connection structure for connecting the ejector pin seat and buffering it during the downward movement.
[0026] The technical solution provided by this invention has the following beneficial effects:
[0027] 1. During the demolding process, the drive block moves away from the rear mold core via the drive cylinder and other drive components. This movement can be divided into two strokes, namely, secondary core pulling. In the first core pulling, the drive block moves downward, causing the sliding seat and the first ejector pin to tilt and slide downward. The first insert detaches from the product. At the same time, the ejector pin remains stationary relative to the rear mold core under the action of the limiting block, allowing the second insert to protrude and separate from the first insert, smoothly exiting from the undercut position of the product. The drive block continues to move downward, the limiting block exits the limiting groove, and no longer restricts the ejector pin. The sliding seat and the ejector pin engage, entering the second core pulling. The drive block drives the sliding seat and the ejector pin to tilt and slide downward simultaneously. The first insert and the second insert tilt and slide downward along the length of the first ejector pin, completing the demolding. Thus, during the demolding process, through secondary core pulling and the multi-directional compound movement of the first and second ejector pins, burrs, deformation, or even tearing can be avoided at the undercut position of the product, improving product yield.
[0028] 2. The cooperation between the first guide surface and the second guide surface ensures that the limiting block can be smoothly inserted into the limiting groove;
[0029] 3. The lower end of the second push rod is slidably connected to the ejector seat via a roller, which reduces the frictional force during the translation of the second push rod relative to the ejector seat and ensures that it moves smoothly under the drive of the first push rod;
[0030] 4. Multiple third mold cores, with their third ejector pins passing through the drive block, sliding seat, and ejector pin seat, resulting in a compact overall mold structure and high space utilization. Attached Figure Description
[0031] Figure 1 This is a schematic diagram of the overall structure of this embodiment;
[0032] Figure 2 This is an exploded schematic diagram showing the sliding seat and ejector seat not separated in this embodiment;
[0033] Figure 3 This is an exploded schematic diagram of the sliding seat and the ejector seat after separation in this embodiment;
[0034] Figure 4 This is a schematic diagram of the structure after removing the mold core in this embodiment;
[0035] Figure 5 This is a cross-sectional view of the mold-closed state in this embodiment;
[0036] Figure 6 This is a cross-sectional view from another perspective in the mold-closed state in this embodiment;
[0037] Figure 7 This is a cross-sectional view of the ejector seat when it is relatively stationary during the first core pulling in this embodiment;
[0038] Figure 8This is a cross-sectional view from another perspective when the ejector seat is relatively stationary during the first core pulling in this embodiment;
[0039] Figure 9 This is a cross-sectional view of the ejector seat after it slides down during the second core pulling in this embodiment;
[0040] Figure 10 This is an exploded view of the sliding seat, ejector seat, and drive block in this embodiment;
[0041] Figure 11 This is a cross-sectional view of the rear mold core and guide block in this embodiment;
[0042] Figure 12 This is a cross-sectional view showing the buffer connection structure in this embodiment;
[0043] Figure 13 This is a top view of the eyeglass temple product in this embodiment to show the angle between the inclined part and the straight part in the horizontal direction;
[0044] Figure 14 This is a front view of the eyeglass temple product in this embodiment to show the vertical angle between the inclined part and the straight part.
[0045] Explanation of reference numerals in the attached drawings: 1. Rear mold core; 11. First sliding groove; 12. Second sliding groove; 2. First mold core; 21. First ejector pin; 211. Assembly hole; 22. First insert; 3. Second mold core; 31. Second ejector pin; 311. Roller; 32. Second insert; 4. Sliding seat; 41. Receiving groove; 42. Guide post; 5. Ejector pin seat; 51. Limiting groove; 52. First guide surface; 53. Rolling groove; 54. Upper ejector plate; 55. Lower ejector plate; 5 6. Buffer hole; 6. Drive block; 7. Limiting block; 71. Second guide surface; 8. Ejector pin; 9. Guide block; 91. First guide groove; 92. Second guide groove; 10. Third mold core; 101. Third ejector pin; 102. Third insert; 100. Sliding buckle structure; 1001. Slide groove; 1002. Slider; 200. Buffer connection structure; 2001. Connecting post; 2002. Spring; 300. Eyeglass temple; 301. Straight part; 302. Inclined part. Detailed Implementation
[0046] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention, primarily used to illustrate the embodiments and to explain the operating principles of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.
[0047] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.
[0048] This embodiment provides a composite motion secondary core-pulling mold structure, mainly used for injection molding eyeglass temples 300. The eyeglass temples 300 include a generally flat straight portion 301 and a relatively inclined inclined portion 302. When the eyeglass temples 300 are placed horizontally, i.e., when the straight portion 301 is placed horizontally, the inclined portion 302 forms an angle with the straight portion 301 both vertically and horizontally. Figure 13 and 14 As shown.
[0049] Reference Figure 1-12 The composite motion secondary core-pulling mold structure includes a rear mold core 1, a first mold core 2, a second mold core 3, a sliding seat 4, an ejector pin seat 5, a drive block 6, and a limiting block 7.
[0050] The first mold core 2 includes a first ejector rod 21 and a first insert 22. The first ejector rod 21 is obliquely inserted into the rear mold core 1, and the first insert 22 is used to form a part of the inclined portion 302 of the eyeglass temple 300.
[0051] The second mold core 3 includes a second ejector pin 31 and a second insert 32. The first ejector pin 21 has an inclined connection hole 211, and the second ejector pin 31 can slide through the connection hole 211 so that there is an angle between the second ejector pin 31 and the first ejector pin 21. In the mold-closed state, the second insert 32 is connected to the first insert 22 and is used to form the undercut at the end of the inclined part 302 of the eyeglass temple 300. In the demolded state, the second ejector pin 31 can slide relative to the first ejector pin 21 through the connection hole 211, thereby protruding and separating from the first insert 22.
[0052] The sliding seat 4 is slidably disposed relative to the rear mold core 1, and its sliding direction is the same as the length direction of the first ejector rod 21; the lower end of the first ejector rod 21 is fixedly connected to the sliding seat 4.
[0053] The ejector pin seat 5 is slidably disposed relative to the rear mold core 1, and its sliding direction is the same as that of the sliding seat 4. The second ejector rod 31 is slidably disposed through the sliding seat 4, and its lower end is slidably connected to the ejector pin seat 5.
[0054] The drive block 6 can slide vertically up and down relative to the rear mold core 1. The drive block 6 and the sliding seat 4 are slidably connected by a sliding buckle structure 100. By sliding the drive block 6 up and down, the sliding seat 4 is driven to slide along the length direction of the first ejector rod 21.
[0055] The limiting block 7 is vertically fixed to the driving block 6, and the ejector seat 5 has a limiting groove 51. The limiting block 7 can be vertically inserted into or removed from the ejector seat 5 along with the driving block 6. By inserting or removing the limiting block 7 from the limiting groove 51, the sliding of the ejector seat 5 relative to the rear mold core 1 is restricted or released. That is, the ejector seat 5 is configured such that: when the limiting block 7 is inserted into the limiting groove 51, the ejector seat 5 is stationary relative to the rear mold core 1; when the limiting block 7 is removed from the limiting groove 51, the ejector seat 5 can slide relative to the rear mold core 1.
[0056] The connection between the second mold core 3 and the ejector seat 5 is configured as follows: when the driving block 6 moves downward and drives the sliding seat 4 to slide, if the limiting block 7 is inserted into the limiting groove 51, the ejector seat 5 is restricted from sliding, and the second ejector rod 31 can translate relative to the ejector seat 5, driving the second insert 32 to disengage from the product undercut direction; if the limiting block 7 exits the limiting groove 51, the ejector seat 5 is released from restriction, and can drive the second mold core 3 to tilt and slide downward together with the sliding direction of the sliding seat 4.
[0057] Reference Figure 5-9 Thus, during the demolding process, the drive block 6 moves away from the rear mold core 1 via the drive hydraulic cylinder and other drive components, which can be divided into two strokes, namely, secondary core pulling. In the first core pulling, the drive block 6 moves downwards, causing the sliding seat 4 and the first ejector rod 21 to slide downwards at an angle (e.g., ...). Figure 8 In the X1 direction), the first insert 22 detaches from the product; simultaneously, since the vertically positioned limiting block 7 remains inserted in the ejector seat 5, the ejector seat 5 remains stationary relative to the rear mold core 1. During this process, the second ejector rod 31, under the action of the assembly hole 211, tilts and translates upwards along the inclined portion 302 of the temple 300 (e.g., in the X1 direction). Figure 8 (in the X2 direction), so that the second insert 32 protrudes and separates from the first insert 22, and can smoothly exit from the undercut at the end of the inclined part 302 of the temple 300. The first core pulling movement is until the limiting block 7 exits the limiting groove 51, without restricting the ejector pin 5. The sliding seat 4 and the ejector pin 5 are in contact, and the second core pulling is entered. The driving block 6 continues to move downward. The driving block 6 drives the sliding seat 4 and the ejector pin 5 to tilt and slide downward at the same time. The first insert 22 and the second insert 32 tilt and slide downward along the length direction of the first ejector rod 21, completing the demolding.
[0058] In this embodiment, refer to Figure 2The sliding fastener structure 100 includes a groove 1001 and a slider 1002, with the slider 1002 slidable within the groove 1001. One of the groove 1001 and the slider 1002 is mounted on the drive block 6, and the other is mounted on the sliding seat 4. Specifically, the groove 1001 is formed on the opposite outer walls of the sliding seat 4, and the length direction of the groove 1001 forms an angle with the sliding direction of the drive block 6, wherein the length direction of the groove 1001 is perpendicular to the sliding direction of the sliding seat 4. The slider 1002 is mounted on the drive block 6 and slides within the two grooves 1001. Through the cooperation of the grooves 1001 and the slider 1002 on both sides, the drive block 6 can drive the sliding seat 4 to smoothly tilt and slide relative to the rear mold core 1 when moving vertically. The slider 1002 is an elongated structure integrally formed on the drive block 6, which increases the contact area with the groove 1001.
[0059] In this embodiment, refer to Figure 5 and Figure 7 The side wall of the ejector pin seat 5 facing the drive block 6 is provided with an inclined first guide surface 52 at the opening of the limiting groove 51, which is used to guide the limiting block 7 into the limiting groove 51 and ensure that the limiting block 7 can be smoothly inserted into the limiting groove 51. Correspondingly, the upper end of the limiting block 7 is provided with an inclined second guide surface 71, which is used to cooperate with the first guide surface 52 to be inserted into the limiting groove 51.
[0060] In this embodiment, refer to Figure 6 and Figure 10 A roller 311 is rotatably mounted on the lower end of the second push rod 31. A rolling groove 53 is provided on the side wall of the ejector pin seat 5 for the roller 311 to roll. The length direction of the rolling groove 53 is approximately the same as the length direction of the inclined portion 302 of the temple 300. It should be noted that since the inclined portion 302 of the temple 300 may not be a perfectly straight structure, its length direction can only be defined by its approximate outline. The two directions are approximately the same, and a small angular deviation between them is allowed, for example, within 0-5°, as long as the second push rod 31 can be translated relative to the ejector pin seat 5 so that the second insert 32 can be fitted and connected or protrude and separate from the first insert 22. The setting of the roller 311 can reduce the frictional force when the second push rod 31 and the ejector pin seat 5 slide relative to each other, ensuring that the second push rod 31 can slide smoothly relative to the first push rod 21.
[0061] In this embodiment, refer to Figure 6 and Figure 10The ejector seat 5 includes an upper ejector plate 54 and a lower ejector plate 55 that are detachably connected and fixed together by screws. The upper ejector plate 54 has a hole extending through its thickness, forming a rolling groove 53 after being connected and fixed to the lower ejector plate 55, for the roller 311 to roll. The detachable connection between the upper ejector plate 54 and the lower ejector plate 55 facilitates the installation of the roller 311 within the ejector seat 5. Furthermore, the width of the opening of the rolling groove 53 is smaller than the width of the bottom of the groove. The roller 311 is arranged on both sides of the second ejector rod 31, forming an inverted T-shaped structure, which prevents the roller 311 from detaching from the rolling groove 53 when installed within it.
[0062] In this embodiment, refer to Figure 8 and Figure 10 It also includes at least one ejector pin 8, which slides along the length of the first ejector rod 21 through the first mold core 2, and its lower end is fixedly connected to the ejector pin seat 5. Through the relative movement of the ejector pin seat 5 and the sliding seat 4, the upper end of the ejector pin 8 can be fitted into the first insert 22 or protrude from the first insert 22, thereby facilitating the ejection of the product from the rear mold core 1.
[0063] In this embodiment, refer to Figure 4 and Figure 10 The sliding seat 4 is provided with a downward-facing receiving groove 41, and the ejector seat 5 is slidably fitted into the receiving groove 41, so that the sliding seat 4 can slide relative to the ejector seat 5 during the first core pulling in the demolding process.
[0064] In this embodiment, refer to Figure 10 The sliding seat 4 has guide posts 42 disposed within the receiving groove 41 facing the ejector seat 5. The guide posts 42 are slidably inserted into the ejector seat 5, and the length direction of the guide posts 42 is the same as the sliding direction of the sliding seat 4. The provision of guide posts 42 ensures that the sliding seat 4 and the ejector seat 5 can slide stably relative to each other. In this embodiment, two guide posts 42 are provided.
[0065] In this embodiment, refer to Figure 2 and Figure 3 The system also includes multiple third mold cores 10, each comprising a third ejector pin 101 and a third insert 102. The third ejector pin 101 is longitudinally and movably inserted into the rear mold core 1, and the third insert 102 is used for the straight portion 301 of the temple 300 of the molded part. Some of the third ejector pins 101 are inserted into the drive block 6 and the ejector pin seat 5, while others are inserted into the drive block 6, the ejector pin seat 5, and the sliding seat 4. The drive block 6, the sliding seat 4, and the ejector pin seat 5 have corresponding holes for the third ejector pins 101 to pass through, and the outer contour of the holes is larger than that of the third ejector pins 101 to avoid interference. Due to the arrangement of multiple third mold cores 10, with the third ejector pins 101 passing through the drive block 6, the ejector pin seat 5, and the sliding seat 4, the overall structure is more compact and occupies less space.
[0066] In this embodiment, refer to Figure 2 and Figure 11 The compound motion secondary core-pulling mold structure also includes a guide block 9, which is fixedly disposed relative to the rear mold core 1. The rear mold core 1 has a first sliding groove 11 and a second sliding groove 12 for sliding of the sliding seat 4 and the ejector seat 5. The guide block 9 has corresponding first guide grooves 91 and 92. The first sliding groove 11 cooperates with the first guide groove 91 to form a first sliding cavity, allowing the sliding seat 4 to slide smoothly. The second sliding groove 12 cooperates with the second guide groove 92 to form a second sliding cavity, allowing the ejector seat 5 to slide smoothly. By providing the guide block 9, it can cooperate with the rear mold core 1 to form sliding grooves for the sliding seat 4 and the ejector seat 5, and it also facilitates the installation and connection of the sliding seat 4 and the ejector seat 5 to the rear mold core 1.
[0067] In this embodiment, refer to Figure 12 Both the guide block 9 and the rear mold core 1 are equipped with a buffer connection structure 200 for connecting the ejector seat 5 and buffering it during its downward movement. The buffer connection structure 200 includes a connecting post 2001 and a spring 2002. The ejector seat 5 has a buffer hole 56 for mounting the connecting post 2001 and the spring 2002. The connecting post 2001 passes vertically upward through the buffer hole 56 and is threaded to the guide block 9 or the rear mold core 1. The spring 2002 is sleeved on the connecting post 2001 and located inside the buffer hole 56, which can apply an upward inclined force to the ejector seat 5, thus providing a buffering effect. During the downward movement of the ejector seat 5, the buffering force of the ejector seat 5 by the spring 2002 can also be transmitted to the sliding seat 4 and the drive block 6.
[0068] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.
Claims
1. A composite motion secondary core-pulling mold structure, characterized in that, include: Post-model kernel; The first mold core includes a first ejector rod and a first insert that are fixedly connected to each other. The first ejector rod is slidably and obliquely inserted into the rear mold core, and the first insert is used to form a part of the product. The second mold core includes a second ejector rod and a second insert that are fixedly connected to each other. The second ejector rod is slidably inclined through the first ejector rod, and there is an included angle between the two. The second insert is connected to the first insert in the mold-closed state and is used to form the undercut of the product. A sliding seat is slidably disposed relative to the rear mold core, and its sliding direction is the same as the length direction of the first ejector rod; the lower end of the first ejector rod is fixedly connected to the sliding seat; An ejector seat is slidably disposed relative to the rear mold core, and its sliding direction is parallel to the sliding direction of the sliding seat; a second ejector rod is slidably disposed through the sliding seat, and the lower end of the second ejector rod is slidably connected to the ejector seat; The driving block is slidable up and down relative to the rear mold core. The driving block and the sliding seat are slidably connected by a sliding buckle structure. The up and down sliding of the driving block can be converted into the sliding of the sliding seat along the length direction of the first ejector rod through the sliding buckle structure. A limiting block is vertically fixed to the driving block and moves up and down with it. The ejector seat has a limiting groove. The limiting block can be selectively inserted into or removed from the limiting groove to limit or release the sliding of the ejector seat relative to the rear mold core. The connection between the second mold core and the ejector seat is configured such that when the driving block moves downward and causes the sliding seat to slide, if the limiting block is inserted into the limiting groove, the ejector seat is restricted from sliding, and the second ejector rod can translate relative to the ejector seat, driving the second insert to disengage from the product undercut direction; if the limiting block exits the limiting groove, the ejector seat is released from restriction and can slide together with the sliding seat.
2. The composite motion secondary core-pulling mold structure according to claim 1, characterized in that: The sliding buckle structure includes a groove and a slider; the slider can slide in the groove; one of the groove and the slider is disposed on the drive block, and the other is disposed on the sliding seat; the length direction of the groove forms an angle with the sliding direction of the drive block, so that the drive block can drive the sliding seat to tilt and slide relative to the rear mold core when it moves vertically.
3. The composite motion secondary core-pulling mold structure according to claim 1, characterized in that: The ejector pin seat has an inclined first guide surface at the opening of the limiting groove on the side wall facing the driving block, which is used to guide the limiting block to be inserted into the limiting groove.
4. The composite motion secondary core-pulling mold structure according to claim 3, characterized in that: The upper end of the limiting block is provided with an inclined second guide surface, which is used to cooperate with the first guide surface to be inserted into the limiting groove.
5. The composite motion secondary core-pulling mold structure according to claim 1, characterized in that: The lower end of the second push rod is slidably connected to the push pin seat via a roller, and the push pin seat has a rolling groove for the roller to roll.
6. The composite motion secondary core-pulling mold structure according to claim 1, characterized in that: It also includes at least one ejector pin, which is slidably inserted through the first mold core and its lower end is connected to the ejector pin seat. The upper end of the ejector pin can extend or retract relative to the first insert through the relative movement of the ejector pin seat and the sliding seat.
7. The composite motion secondary core-pulling mold structure according to claim 1, characterized in that: The sliding seat is provided with a receiving groove, and the ejector pin seat is slidably fitted into the receiving groove.
8. The composite motion secondary core-pulling mold structure according to claim 7, characterized in that: The sliding seat has a guide post in the receiving groove facing the ejector seat. The guide post is slidably inserted into the ejector seat, and the length direction of the guide post is the same as the sliding direction of the sliding seat.
9. The composite motion secondary core-pulling mold structure according to claim 1, characterized in that: It also includes a guide block fixedly disposed relative to the rear mold core, and a first sliding cavity and a second sliding cavity are formed between the guide block and the rear mold core. The first sliding cavity is used to accommodate and guide the sliding seat, and the second sliding cavity is used to accommodate and guide the ejector pin seat.
10. A composite motion secondary core-pulling mold structure according to any one of claims 1-9, characterized in that: It also includes multiple third mold cores; each third mold core includes a third ejector rod and a third insert that are fixedly connected to each other. The third ejector rod is movably inserted through the rear mold core, and the third insert is used to form a part of the product. The third ejector rod is movably inserted through the drive block, ejector seat, and sliding seat, or movably inserted through the drive block and ejector seat.