Core-pulling demolding mechanism in mold cavity of automobile interior trim part mold
By coordinating the design of the vertical bend and the fixed block, and transmitting the force of the ejector spring, the step-by-step demolding of automotive interior parts molds was achieved, solving the problems of synchronous core pulling and ejection, and improving the demolding success rate and product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANJING BINCHENNUO MOULD CO LTD
- Filing Date
- 2025-03-04
- Publication Date
- 2026-04-21
AI Technical Summary
In existing technologies, the core pulling and ejection processes of automotive interior parts molds cannot be carried out simultaneously, resulting in high mold costs or product damage, especially in complex structures where demolding is difficult.
The design employs a combination of vertical levers and fixed blocks to achieve step-by-step demolding through the lever principle. Combined with the force transmission of ejector pins and springs, it ensures uniform and stable force, avoiding product deformation and damage to the internal structure.
It improves the success rate of demolding, ensures product quality and mold life, and avoids product extrusion deformation and internal structural damage during the demolding process.
Smart Images
Figure CN224145288U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automotive mold technology, specifically a core-pulling and demolding mechanism for automotive interior parts mold cavities. Background Technology
[0002] Automotive interior parts are generally injection molded. During injection molding, the interior parts have inclined inserts on the side that require core pulling. In the existing technology, hydraulic cylinders are generally used to drive core pulling. However, since the inserts are inclined, using hydraulic cylinders will increase the mold cost. Secondly, using hydraulic cylinders for core pulling cannot achieve the synchronous operation of insert core pulling and product ejection.
[0003] For some molds with relatively simple structures, traditional ejector pin demolding and push plate demolding methods may be able to meet basic demolding requirements. However, when the product has complex structures such as side holes, slots, and bosses, these simple demolding methods cannot achieve the extraction of the core, resulting in the product being unable to be demolded smoothly, or the product being damaged during forced demolding, affecting product quality and the service life of the mold.
[0004] Therefore, this utility model provides a core-pulling and demolding mechanism for automotive interior parts mold cavities to solve the above problems. Utility Model Content
[0005] (a) Technical problems to be solved
[0006] This utility model provides a core-pulling and demolding mechanism for automotive interior parts mold cavities, aiming to solve the problems mentioned in the background art.
[0007] (II) Technical Solution
[0008] To achieve the above objectives, this utility model provides the following technical solution: It includes an upper mold, with a concave groove on one side of its upper surface. A core-pulling pressure plate is fixedly installed in the concave groove of the upper mold. A lower mold is fixedly installed on the lower surface of the upper mold. Two fixing blocks are fixedly installed on both sides of the upper mold. One of the fixing blocks has its surface fixedly installed on one side of the lower mold. A positioning pin is fixedly installed on one side of the fixing block. The fixing block is fixedly installed on the upper mold and the lower mold by the positioning pin on one side. A chamfer is provided on one side of the upper surface of the fixing block. A movable connecting vertical bend is provided on the side of the lower mold near the fixing block. A bend is provided on one side of the vertical bend.
[0009] As a preferred technical solution of this application, an L-shaped end is fixedly installed in the middle of the upper surface of the bend. One end of the L-shaped end extends into the concave groove and is placed on the lower surface of the core-pulling pressure plate. A T-shaped groove is opened on the upper surface of the L-shaped end, and a guide block is slidably engaged on the inner arc surface of the T-shaped groove.
[0010] As a preferred technical solution of this application, the guide block has a receiving surface on one side and a T-shaped block at the tail end. The guide block is slidably engaged with the T-shaped slot through the T-shaped block on one side.
[0011] As a preferred technical solution of this application, corresponding holes are provided on both sides of the upper surface of the receiving surface, and washers are fixedly installed on the inner arc surface of the corresponding holes, and springs are fixedly installed on the upper surface of the washers.
[0012] As a preferred technical solution of this application, a push rod is fixedly installed on the upper surface of the spring, the push rod is sleeved inside the spring, a hole is opened on the upper surface of the push rod, and a core puller is connected through the top hole of the push rod.
[0013] As a preferred technical solution of this application, the upper surface of the vertical bend is provided with an abutment end A, and the fixing block near the lower mold of the vertical bend is provided with an abutment end B. One side of the abutment end A is fitted and connected to the chamfer of one side of the fixing block.
[0014] (III) Beneficial Effects
[0015] 1. Through the coordinated work of the vertical bend and the fixed block, not only is the demolding action carried out in an orderly manner step by step, but also through the ingenious transmission and conversion of force, the product is always subjected to a uniform and stable force, which improves the success rate of demolding and the quality of the product. This provides a solid guarantee for the efficient and precise operation of mold production, and the product appearance will not be squeezed and deformed during the demolding process.
[0016] 2. The core puller, hidden between the upper and lower molds by the ejector rod and spring, is constrained around the mold as the overall demolding action continues. Under the indirect force generated by its own structural design and the movement of surrounding components, the core puller begins to detach from the encirclement of the two molds, avoiding any scratches or damage to the internal structure of the product. This ensures that the product can be completely demolded while the fine internal structure remains intact. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of the upper and lower molds of a core-pulling and demolding mechanism for automotive interior parts molds.
[0018] Figure 2 This is a side view of the vertical crank and the fixing block in a core-pulling and demolding mechanism for automotive interior parts molds.
[0019] Figure 3 A schematic diagram of the overall back structure of a core-pulling and demolding mechanism for an automotive interior part mold cavity;
[0020] Figure 4This is a schematic diagram of the corner of a core-pulling and demolding mechanism inside the cavity of an automotive interior part mold.
[0021] In the picture:
[0022] 1. Upper mold; 2. Core-pulling pressure plate; 3. Lower mold; 4. Fixing block; 401. Positioning pin; 402. Chamfer; 5. Vertical bend; 501. Corner; 502. L-shaped end; 503. T-slot; 504. Abutment end A; 505. Abutment end B; 6. Guide block; 601. Receiving surface; 602. Corresponding hole; 7. Washer; 8. Spring; 9. Push rod; 10. Core puller. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0024] This utility model provides a core-pulling and demolding mechanism, such as Figures 1 to 4 As shown, the upper mold 1 has a concave groove on one side of its upper surface. A core-pulling plate 2 is fixedly installed in the concave groove of the upper mold 1. A lower mold 3 is fixedly installed on the lower surface of the upper mold 1. Two fixing blocks 4 are fixedly installed on both sides of the upper mold 1. One of the fixing blocks 4 is fixedly installed on one side of the lower mold 3. A positioning pin 401 is fixedly installed on one side of the fixing block 4. The fixing block 4 is fixedly installed on the upper mold 3 by the positioning pin 401 on one side. On mold 1 and lower mold 3, a chamfer 402 is provided on one side of the upper surface of the fixing block 4. A vertical bend 5 is movably connected on the side of the lower mold 3 near the fixing block 4. A bend 501 is provided on one side of the vertical bend 5. An L-shaped end 502 is fixedly installed in the middle of the upper surface of the bend 501. One end of the L-shaped end 502 extends into the concave groove and is placed on the lower surface of the core-pulling pressure plate 2. A T-shaped groove 503 is opened on the upper surface of the L-shaped end 502. A guide block 6 is slidably engaged on the inner arc surface of the T-shaped groove 503.
[0025] On one side of the lower mold 3, a vertical bend 5 is movably connected. At the same time, a fixing block 4 is fixed on one side of the upper mold 1 and the side of the lower mold 3 near the vertical bend 5. The mechanical transmission between the vertical bend 5 and the fixing block 4 enables the step-by-step ejection operation of the upper mold 1. This design ensures that the product appearance will not be squeezed and deformed during the demolding process.
[0026] Specifically, a chamfer 402 is provided at the abutment end A504 of the vertical bend 5 near one side of the fixing block 4, and a corresponding chamfer 402 is also provided at the abutment end B505 of the vertical bend 5 near the other side of the fixing block 4. When the mold is working, the upper mold 1 moves downward, and the bend edge 501 on one side of the vertical bend 5 moves accordingly. During this process, the lever principle comes into play. As the bottom end of the vertical bend 5 gradually tilts downward, it will make a circular motion around the connecting axis point on the lower mold 3. Due to this circular motion, the downward tilt of the bottom end of the vertical bend 5 will cause the abutment end A504 at the top to be misaligned with the chamfer 402 of the fixing block 4 in the upper mold 1. At this time, the abutment end A504 at the top will be like ( Figure 2 As shown, it moves smoothly from left to right and abuts against the top fixed block 4, while the bottom abutting end B505 moves in the opposite direction, from right to left, and abuts tightly against the chamfer 402 on the fixed block 4.
[0027] In this way, a reverse thrust will be formed between the upper mold 1 and the lower mold 3. This reverse thrust will first generate an upward lifting force on the upper mold 1, causing the upper mold 1 to slowly move upward. As the upper mold 1 rises, the product and the cavity wall of the upper mold 1 will gradually separate, and the demolding process of the upper part of the product will begin. During this process, due to the abutment design between the vertical bend 5 and the fixed block 4, the reverse thrust will act evenly and continuously on the upper mold 1, avoiding uneven local force, thereby effectively preventing the product from being squeezed and deformed due to improper force.
[0028] Once the upper part of the product has been demolded to a certain extent, as the vertical crank 5 continues to rotate, the bottom abutment end B505 continues to push the fixing block 4 on the lower mold 3, causing the lower mold 3 to also begin to move relative to the product. At this time, the lower mold 3 generates an upward lifting force on the lower part of the product, which, together with the lifting force of the upper mold 1, further helps the product to be completely removed from the mold. Throughout the demolding process, the coordinated work of the vertical crank 5 and the fixing block 4 not only ensures that the demolding action is carried out step by step in an orderly manner, but also ensures that the product is always subjected to a uniform and stable force through clever force transmission and conversion, thereby improving the success rate of demolding and the quality of the product, and providing a solid guarantee for the efficient and precise operation of mold production.
[0029] One side of the guide block 6 is provided with a receiving surface 601, and the tail end of the guide block 6 is provided with a T-shaped block. The guide block 6 is slidably engaged with the T-shaped groove 503 through the T-shaped block on one side. The upper surface of the receiving surface 601 is provided with corresponding holes 602 on both sides. Washers 7 are fixedly installed on the inner arc surface of the corresponding holes 602. Springs 8 are fixedly installed on the upper surface of washers 7. Push rods 9 are fixedly installed on the upper surface of springs 8. Push rods 9 are sleeved inside springs 8. Holes are opened on the upper surface of push rods 9. A core puller 10 is connected through the top hole of push rods 9. One side of the upper surface of the vertical bend 5 is provided with an abutment end A504. The fixed block 4 on the side of the vertical bend 5 near the lower mold 3 is provided with an abutment end B505. One side of the abutment end A504 is fitted and connected to the chamfer 402 on one side of the fixed block 4.
[0030] As the bend 501 slowly tilts downward, the L-shaped end 502 connected to it in the middle section, driven by the lever action, moves along a predetermined trajectory. During the upward movement of the connecting guide block 6, its top end engages with and pushes the washer 7 in the receiving surface 601. After being subjected to force, the washer 7 steadily transmits the force to the ejector rod 9 installed on it. Under the upward thrust, the ejector rod 9 moves upward synchronously with the connecting guide block 6 and the washer 7. During this process, the spring 8 connected below the ejector rod 9 is compressed. The elastic potential energy of the spring 8 provides continuous and stable assistance for the subsequent demolding action.
[0031] As the ejector pin 9 extends upward, its top gradually comes into close contact with the upper mold 1 and applies an upward force. Under the combined action of the ejector pin 9 and the spring 8, the upper mold 1 begins to slowly detach, and the adhesion between the product and the cavity of the upper mold 1 is gradually overcome, and the demolding process of the upper part of the product proceeds smoothly.
[0032] After the upper part of the product is demolded to a certain extent, the coordinated operation inside the mold does not stop. At this time, due to the partial detachment of the upper mold 1, the internal structural space of the mold changes. The central core puller 10, hidden between the upper and lower molds 3, is constrained by its surroundings. As the overall demolding action of the mold continues, the central core puller 10 begins to detach from the encirclement of the two molds under the indirect force generated by its own structural design and the movement of surrounding components. This avoids any scratches or damage to the internal structure of the product, ensuring that the product is completely demolded while the delicate internal structure remains intact.
[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A core-pulling stripping mechanism in a mold cavity of an automotive interior part, comprising an upper mold (1), characterized in that: A concave groove is provided on one side of the upper surface of the upper mold (1). A core-pulling pressure plate (2) is fixedly installed in the concave groove of the upper mold (1). A lower mold (3) is fixedly installed on the lower surface of the upper mold (1). Fixing blocks (4) are fixedly installed on both sides of the upper mold (1). There are two fixing blocks (4). The surface of one of the fixing blocks (4) is fixedly installed on one side of the lower mold (3). A positioning pin (401) is fixedly installed on one side of the fixing block (4). The fixing block (4) is fixedly installed on the upper mold (1) and the lower mold (3) by the positioning pin (401) on one side. A chamfer (402) is provided on one side of the upper surface of the fixing block (4). A movable connecting body vertical bend (5) is provided on the side of the lower mold (3) near the fixing block (4). A bend (501) is provided on one side of the vertical bend (5).
2. The core-pulling stripping mechanism in a mold cavity of an automotive interior part according to claim 1, characterized in that: An L-shaped end (502) is fixedly installed in the middle of the upper surface of the bend (501). One end of the L-shaped end (502) extends into the concave groove and is placed on the lower surface of the core-pulling plate (2). A T-shaped groove (503) is opened on the upper surface of the L-shaped end (502). A guide block (6) is slidably engaged on the inner arc surface of the T-shaped groove (503).
3. The core-pulling stripping mechanism in a mold cavity of an automotive interior part according to claim 2, characterized in that: The guide block (6) has a receiving surface (601) on one side and a T-shaped block at the tail end. The guide block (6) slides and engages with the T-shaped groove (503) through the T-shaped block on one side.
4. The core-pulling stripping mechanism in a mold cavity of an automotive interior part according to claim 3, characterized in that: The upper surface of the receiving surface (601) is provided with corresponding holes (602) on both sides. Washers (7) are fixedly installed on the inner arc surface of the corresponding holes (602), and springs (8) are fixedly installed on the upper surface of the washers (7).
5. The core-pulling stripping mechanism in a mold cavity of an automotive interior part according to claim 4, characterized in that: A push rod (9) is fixedly installed on the upper surface of the spring (8). The push rod (9) is sleeved inside the spring (8). A hole is opened on the upper surface of the push rod (9). A core puller (10) is connected through the top hole of the push rod (9).
6. The core-pulling stripping mechanism in a mold cavity of an automotive interior part mold according to claim 1, characterized in that: The upper surface of the vertical bend (5) is provided with an abutment end A (504) on one side, and the fixing block (4) of the vertical bend (5) near the lower mold (3) is provided with an abutment end B (505). One side of the abutment end A (504) is fitted and connected to the chamfer (402) on one side of the fixing block (4).