A forming die for an automobile headlamp middle plate

Abstract

The utility model discloses a kind of forming die of automobile headlamp middle plate, including lower die group, lower die group includes lower die seat and the forming block in lower die seat, ejection assembly is set on lower die seat and penetrates, ejection assembly includes ejector pin bottom plate, and first ejector pin and second ejector pin are connected on ejector pin bottom plate, first ejector pin and second ejector pin are different positions of forming block respectively, second ejector pin has the ejection speed distinguished from first ejector pin, so that second ejector pin is relatively first ejector pin and is delayed to extend from forming block.The utility model aims at the different of product each part structure strength, makes ejection structure staggered ejection, realizes smooth, nondestructive stripping, guarantees product quality and production stability.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts manufacturing technology, and in particular to a molding die for an automotive headlight center plate. Background Technology

[0002] In the automotive manufacturing industry, injection molding is the main process for producing plastic parts. The design of the molding die is directly related to the product quality, production efficiency and cost. The middle plate of the automotive headlight usually has a complex shape and many weak structures. The traditional ejection system usually uses multiple ejector pins or ejector rods mounted on the same ejector plate. They move synchronously under the push of the ejector rod of the injection molding machine to eject the product from the mold.

[0003] However, due to the different wrapping and adhesion forces between different parts of the product and the cavity, synchronous ejection will cause uneven stress, which can easily lead to local stretching, twisting, or even whitening or breakage of the product during the ejection process. In particular, the scrap rate is high for some structurally fragile areas. Utility Model Content

[0004] The purpose of this invention is to provide a molding die for the middle plate of an automotive headlight. By taking into account the different structural strengths of various parts of the product, the ejection structure is ejected at different times, achieving smooth and damage-free demolding, and ensuring product quality and production stability.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a molding die for a car headlight mid-plate, comprising a lower die assembly, the lower die assembly comprising a lower die base and a molding block located within the lower die base, an ejector assembly being disposed through the lower die base, the ejector assembly comprising an ejector pin base plate, and a first ejector pin and a second ejector pin connected to the ejector pin base plate, the first ejector pin and the second ejector pin respectively acting on different positions of the molding block, the second ejector pin having an ejection speed different from that of the first ejector pin, such that the second ejector pin extends out of the molding block with a delay relative to the first ejector pin.

[0006] By adopting the above technical solution, the second ejector pin changes its ejection speed to be slower than the first ejector pin in ejecting from the cavity. As a result, the parts of the product with high structural strength are subjected to force first, reducing the wrapping force between the parts of the product with weaker structural strength and the cavity. This reduces the stress applied by the second ejector pin to the parts of the product with weaker structural strength, achieving smooth and damage-free demolding of the entire product, and ensuring product quality and production stability.

[0007] A further feature of this invention is that the second ejector pin includes an inner pin fixedly connected to the ejector pin base plate, and an outer sleeve constituting the molding surface of the molding block. The outer sleeve is sleeved outside the inner pin, and a gap space is provided between the inner pin and the outer sleeve. When the ejector pin base plate drives the inner pin to move toward the molding block, the inner pin abuts against the outer sleeve through the gap space and pushes the outer sleeve out of the molding block.

[0008] By adopting the above technical solution, due to the existence of a gap space, when the first ejector pin acts on the end face of the product and pushes it out, the inner pin has not yet come into contact with the outer sleeve, thereby achieving the effect of delayed ejection of the outer sleeve relative to the first ejector pin.

[0009] A further feature of this invention is that the molding block includes a mating part connected to the outer sleeve, the mating part being guided to the outer sleeve to guide the linear motion of the outer sleeve into a rotational motion.

[0010] By adopting the above technical solution, the linear motion of the outer sleeve is guided into rotational motion, thereby changing the travel speed of the outer sleeve and extending the time it acts on the end face of the product.

[0011] A further feature of this invention is that the outer sleeve has a protrusion, and the mating part has a spiral groove for accommodating the protrusion.

[0012] A further feature of this invention is that the mating part has a straight groove, which is located below the spiral groove and communicates with it.

[0013] By adopting the above technical solutions, the entire product can be demolded more smoothly and without damage, ensuring product quality and production stability.

[0014] A further feature of this invention is that an elastic element is provided within the gap space, and the inner needle causes the outer sleeve to displace in the direction extending out of the molding block via the elastic element.

[0015] By adopting the above technical solution and setting up elastic components, the problem of the inner needle directly contacting the outer sleeve and causing the outer sleeve to spiral upwards at an accelerated rate, which could easily damage the product, is avoided. This ensures that the outer sleeve spirals up and down smoothly, making the entire product more stable during demolding and guaranteeing product quality and production stability.

[0016] A further feature of this invention is that a reset device is provided on the outer sleeve. When the ejector pin base plate drives the inner pin to move away from the molding block, the inner pin drives the outer sleeve to move synchronously through the reset device.

[0017] By adopting the above technical solution and setting a reset device, the protrusions on the outer sleeve are prevented from remaining on the spiral groove, which would affect the next use, thus optimizing the demolding operation.

[0018] A further feature of this invention is that the reset device includes a boss protruding from the inner wall of the outer sleeve, and the inner needle is provided with an annular protrusion corresponding to the position of the boss. When the ejector pin base plate drives the inner needle to move away from the molding block, the annular protrusion abuts against the boss.

[0019] A further feature of this invention is that an installation portion is provided at one end of the inner needle near the base plate of the ejector pin, the installation portion extends radially along the inner needle, and the inner needle is fixedly connected to the base plate of the ejector pin through the installation portion.

[0020] By adopting the above technical solution, the inner needle is prevented from rotating under the influence of the outer sleeve, thus stopping the inner needle from rotating and ensuring that the inner needle can normally drive the outer sleeve to rise and fall.

[0021] In summary, this utility model has the following beneficial effects: 1. An outer sleeve is fitted over the inner pin, with a gap between them. When the first ejector pin acts on the product end face and pushes it out, the inner pin has not yet come into contact with the outer sleeve. This achieves a delayed ejection effect of the outer sleeve relative to the first ejector pin. As a result, the parts of the product with high structural strength are subjected to force first, reducing the wrapping force between the parts with weaker structural strength and the cavity. This reduces the stress applied by the second ejector pin to the parts with weaker structural strength, achieving smooth and damage-free demolding of the entire product, ensuring product quality and production stability.

[0022] 2. The outer sleeve is provided with a protrusion, and the mating part is provided with a spiral groove to accommodate the protrusion. The protrusion can rotate and rise and fall within the spiral groove. When the inner needle abuts against the outer sleeve, the outer sleeve is driven by the inner needle to rise spirally through the protrusion, which guides the linear motion of the outer sleeve into rotational motion, thereby changing the travel speed of the outer sleeve and prolonging the time it acts on the end face of the product. Attached Figure Description

[0023] Figure 1 This is a perspective view of the present invention.

[0024] Figure 2 This is a cross-sectional view of the present invention.

[0025] Figure 3 This is a utility model Figure 2 Enlarged view of point A in the middle.

[0026] Figure 4 This is a schematic diagram of the outer sleeve of this utility model extending out of the molding block.

[0027] In the diagram: 1. Lower mold base; 2. Molding block; 21. Mating part; 31. Ejector pin base plate; 32. First ejector pin; 33. Second ejector pin; 331. Inner pin; 332. Outer sleeve; 333. Gap space; 334. Elastic element; 4. Boss; 5. Annular protrusion; 61. Protrusion; 62. Spiral groove; 63. Straight groove; 7. Mounting part. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] A molding die for a car headlight midsole, such as Figure 1-4 As shown, the lower mold assembly includes a lower mold base 1 and a molding block 2 located within the lower mold base 1. An ejection assembly is provided through the lower mold base 1. The ejection assembly includes an ejector base plate 31 and a first ejector pin 32 and a second ejector pin 33 connected to the ejector base plate 31. The first ejector pin 32 and the second ejector pin 33 act on different positions of the molding block 2. The second ejector pin 33 has an ejection speed different from that of the first ejector pin 32, so that the second ejector pin 33 extends out of the molding block 2 with a delay relative to the first ejector pin 32. The molding block 2 is part of the mold cavity. The first ejector pin 32 and the second ejector pin 33 are both fixedly connected to the ejector base plate 31 by bolts. The ejector base plate 31 is horizontal and has a vertical upward or downward movement trajectory. The ends of the first ejector pin 32 and the second ejector pin 33 away from the ejector base plate 31 constitute part of the cavity. The first ejector pin 32 corresponds to the part of the product with high structural strength, and the second ejector pin 33 corresponds to the part of the product with weaker structural strength. The ejector base plate 31 drives the first ejector pin 32 and the second ejector pin 33 to extend out of the cavity and eject the product in the cavity. The second ejector pin 33 ejects out of the cavity slower than the first ejector pin 32 by changing the ejection speed. As a result, the part of the product with high structural strength is subjected to force first, reducing the wrapping force between the part of the product with weaker structural strength and the cavity. This reduces the stress applied by the second ejector pin 33 to the part of the product with weaker structural strength, so as to achieve smooth and damage-free demolding of the entire product and ensure product quality and production stability.

[0030] Preferably, the second ejector pin 33 includes an inner pin 331 fixedly connected to the ejector pin base plate 31, and an outer sleeve 332 constituting the molding surface of the molding block 2. The outer sleeve 332 is sleeved outside the inner pin 331, and a gap space 333 is provided between the inner pin 331 and the outer sleeve 332. When the ejector pin base plate 31 drives the inner pin 331 to move towards the molding block 2, the inner pin 331 abuts against the outer sleeve 332 through the gap space 333, and pushes the outer sleeve 332 out of the molding block 2. The diameter of the gap space 333 is at least larger than the maximum diameter of the inner pin 331. The inner pin 331 rises at the same initial speed as the first ejector pin 32. Due to the existence of the gap space 333, when the first ejector pin 32 acts on the product end face and pushes it out, the inner pin 331 has not yet contacted the outer sleeve 332, thereby achieving the effect of delayed ejection of the outer sleeve 332 relative to the first ejector pin 32.

[0031] Preferably, the molding block 2 includes a mating part 21 connected to the outer sleeve 332. The mating part 21 is guided to engage with the outer sleeve 332, thereby guiding the linear motion of the outer sleeve 332 into a rotational motion. By guiding the linear motion of the outer sleeve 332 into a rotational motion, the traveling speed of the outer sleeve 332 is changed, thereby extending the time it acts on the end face of the product.

[0032] Preferably, the outer sleeve 332 is provided with a protrusion 61, and the mating part 21 is provided with a spiral groove 62 to accommodate the protrusion 61. The size of the protrusion 61 is adapted to the groove diameter of the spiral groove 62, so that the protrusion 61 can rotate and rise and fall within the spiral groove 62. When the inner needle 331 abuts against the outer sleeve 332, the outer sleeve 332 spirals upward through the protrusion 61 under the drive of the inner needle 331.

[0033] Preferably, the mating part 21 has a straight groove 63, which is located below and communicates with the spiral groove 62. The protrusion 61 moves linearly upward or downward within the straight groove 63. When the inner pin 331 abuts against the outer sleeve 332, the protrusion 61 is located within the straight groove 63, and the outer sleeve 332 rises synchronously with the first ejector pin 32. This ensures that the parts with high structural strength and the parts with weaker structural strength are ejected synchronously, preventing the product from jamming. Then, the protrusion 61 enters the spiral groove 62, changes its travel speed, and rises slowly, causing it to be slowly ejected relative to the first ejector pin 32. This makes the entire product more stable and damage-free during demolding, ensuring product quality and production stability.

[0034] Preferably, an elastic element 334 is provided within the gap space 333. The inner needle 331 causes the outer sleeve 332 to displace in the direction extending out of the molding block 2 via the elastic element 334. The elastic element 334 is a spring, and the size of the gap space 333 is adapted to the spring to prevent it from dislodging. The position of the elastic element 334 is directly above the ejector pin. When the protrusion 61 enters the spiral groove 62, the elastic element 334 is in a compressed state. Driven by the elastic element 334, the outer sleeve 332 spirals upward at a uniform speed. By setting the elastic element 334, the inner needle 331 is prevented from directly contacting the outer sleeve 332, which would cause the outer sleeve 332 to spiral upward at an accelerated speed, thus avoiding the problem of easily damaging the product. This ensures that the outer sleeve 332 spirals up and down smoothly, making the entire product more stable during demolding and ensuring product quality and production stability.

[0035] Preferably, the outer sleeve 332 is provided with a reset device. When the ejector plate 31 drives the inner pin 331 to move away from the molding block 2, the inner pin 331 drives the outer sleeve 332 to move synchronously through the reset device. By providing a reset device, the protrusion 61 on the outer sleeve 332 is prevented from remaining on the spiral groove 62, which would affect the next use, thus optimizing the demolding operation.

[0036] Preferably, the reset device includes a boss 4 protruding from the inner wall of the outer sleeve 332, and an annular protrusion 5 corresponding to the position of the boss 4 on the inner needle 331. When the ejector pin base plate 31 drives the inner needle 331 to move away from the molding block 2, the annular protrusion 5 abuts against the boss 4. The annular protrusion 5 is located above the boss 4, the boss 4 is annular and integrally formed with the outer sleeve 332, and the minimum diameter of the annular protrusion 5 is larger than the diameter of the hollow area of ​​the boss 4. When the ejector pin base plate 31 drives the inner needle 331 to move downward, the annular protrusion 5 abuts against the boss 4 and drives the outer sleeve 332 to fall synchronously, completing the reset.

[0037] Preferably, the inner needle 331 has a mounting portion 7 at one end near the ejector pin base plate 31. The mounting portion 7 extends radially along the inner needle 331, and the inner needle 331 is fixedly connected to the ejector pin base plate 31 through the mounting portion 7. This prevents the inner needle 331 from rotating under the influence of the outer sleeve 332, thus stopping the inner needle 331 and ensuring that the inner needle 331 can normally drive the outer sleeve 332 to rise and fall. The above description is only a preferred embodiment of this utility model. Therefore, all equivalent changes or modifications made to the structure, features, and principles described in the claims of this utility model patent application are included within the scope of this utility model patent application.

Claims

1. A molding die for a car headlight midsegment, comprising a lower die assembly, the lower die assembly including a lower die base (1) and a molding block (2) located within the lower die base (1), wherein an ejector assembly is provided through the lower die base (1), characterized in that: The ejection assembly includes an ejector base plate (31), and a first ejector pin (32) and a second ejector pin (33) connected to the ejector base plate (31). The first ejector pin (32) and the second ejector pin (33) act on different positions of the molding block (2). The second ejector pin (33) has an ejection speed different from that of the first ejector pin (32), so that the second ejector pin (33) extends out of the molding block (2) with a delay relative to the first ejector pin (32).

2. The molding die for a car headlight center plate according to claim 1, characterized in that: The second ejector pin (33) includes an inner pin (331) fixedly connected to the ejector pin base plate (31) and an outer sleeve (332) constituting the molding surface of the molding block (2). The outer sleeve (332) is sleeved outside the inner pin (331). A gap space (333) is provided between the inner pin (331) and the outer sleeve (332). When the ejector pin base plate (31) drives the inner pin (331) to move toward the molding block (2), the inner pin (331) abuts against the outer sleeve (332) through the gap space (333) and pushes the outer sleeve (332) out of the molding block (2).

3. The molding die for a car headlight center plate according to claim 2, characterized in that: The molding block (2) includes a mating part (21) connected to the outer sleeve (332). The mating part (21) is guided to engage with the outer sleeve (332), so that the linear motion of the outer sleeve (332) is guided to rotational motion.

4. The molding die for a car headlight center plate according to claim 3, characterized in that: The outer sleeve (332) is provided with a protrusion (61), and the mating part (21) is provided with a spiral groove (62) to accommodate the protrusion (61).

5. The molding die for a car headlight midsegment according to claim 4, characterized in that: The mating part (21) has a straight groove (63), which is located below the spiral groove (62) and communicates with the spiral groove (62).

6. The molding die for a car headlight center plate according to claim 4, characterized in that: The gap space (333) is provided with an elastic element (334), and the inner needle (331) causes the outer sleeve (332) to move in the direction of extending out of the molding block (2) through the elastic element (334).

7. The molding die for a car headlight center plate according to claim 2, characterized in that: The outer sleeve (332) is provided with a reset device. When the ejector pin base plate (31) drives the inner pin (331) to move away from the molding block (2), the inner pin (331) drives the outer sleeve (332) to move synchronously through the reset device.

8. The molding die for a car headlight center plate according to claim 7, characterized in that: The reset device includes a boss (4) protruding from the inner wall of the outer sleeve (332), and an annular protrusion (5) corresponding to the position of the boss (4) is provided on the inner needle (331). When the ejector plate (31) drives the inner needle (331) to move away from the molding block (2), the annular protrusion (5) abuts against the boss (4).

9. The molding die for a car headlight center plate according to claim 2, characterized in that: The inner needle (331) is provided with a mounting part (7) at one end near the ejector base plate (31). The mounting part extends radially along the inner needle (331), and the inner needle (331) is fixedly connected to the ejector base plate (31) through the mounting part (7).

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