Injection Mold with Local Delayed Ejection

Abstract

The present invention provides an injection mold with local delayed ejection, which is used to solve the problem of ejector mark generated during molding in the prior art. The present invention provides an injection mold with local delayed ejection, including: a moving mold, a fixed mold, a first straight ejector rod and a first straight ejector block; a molding cavity is formed between the moving mold and the fixed mold, the moving mold includes a driving plate, the first straight ejector rod is disposed in the moving mold, and the driving plate can push the first straight ejector rod in the mold closing direction; the first straight ejector block is installed at one end of the first straight ejector rod close to the molding cavity; a first elastic member is provided at one end of the first straight ejector rod away from the molding cavity, the first elastic member is installed at one end of the first straight ejector rod away from the molding cavity, and the first elastic member is used to tension the first straight ejector rod in the lateral direction of the moving mold side. When the driving plate is in the initial state, a first initial interval is provided between the first straight ejector rod and the driving plate. The generation of ejector marks can be avoided.

Description

Technical Field

[0001] The present invention relates to the field of injection molds, and particularly to an injection mold with local delayed ejection. Background Art

[0002] Currently, people have higher and higher requirements for the quality of cars, especially for car interior parts, such as the front defrost panel of the instrument panel, door trim, rear door trim, side panels of the center console, etc. These parts are strengthened by many ribs on the back, and it is extremely easy to produce a serious phenomenon of ejector marks in local areas of the product appearance. Even after the product appearance is textured, it cannot be covered up.

[0003] Generally, during the injection molding process of these parts, when there are serious ejector marks in local areas of the product appearance, the matching flatness of the ejector and the moving mold is checked. When the problem still cannot be solved, the process parameters are adjusted, such as extending the product cooling time, slowing down the ejection speed, etc. However, this problem still cannot be completely solved, and this method has serious drawbacks, as follows:

[0004] 1. The product qualification rate is extremely low, and the scrap rate is very high;

[0005] 2. The debugging time during the production process is long, and the production is seriously unstable;

[0006] 3. The production cycle is extended, and the production cost is high;

[0007] 4. The process parameter range is narrow, and it is difficult to adapt to continuous production.

[0008] Based on the above problems, it is necessary to find a mold implementation solution to completely solve this problem, so as to fundamentally solve this technical problem. Summary of the Invention

[0009] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide an injection mold with local delayed ejection, which is used to solve the problem of ejector marks generated during molding in the prior art.

[0010] To achieve the above purpose and other related purposes, the present invention provides an injection mold with local delayed ejection, including: a moving mold, a fixed mold, a first straight ejector rod, and a first straight ejector block;

[0011] A molding cavity is formed between the moving mold and the fixed mold. The moving mold includes a driving plate. The first straight ejector rod is placed inside the moving mold, and the driving plate can push all the ejector rods in the mold closing direction;

[0012] The first straight ejector block is installed at one end of the first straight ejector rod close to the molding cavity;

[0013] One end of the first direct ejector rod away from the molding cavity is provided with a first elastic member, the first elastic member is installed at one end of the first direct ejector rod away from the molding cavity, and the first elastic member is used to tension the first direct ejector rod in the mold closing direction. When the driving plate is in the initial state, there is a first initial gap between the first direct ejector rod and the driving plate.

[0014] Optionally, the molding thickness at the position of the first direct ejector block is less than the molding thickness at one or more places on the circumferential side of the first direct ejector block.

[0015] Optionally, the molding thickness at the position of the first direct ejector block is less than the molding thickness at each place on the circumferential side of the first direct ejector block.

[0016] Optionally, the circumferential side of the first direct ejector block is a rib molding cavity.

[0017] Optionally, there is a doghouse molding cavity on the circumferential side of the first direct ejector block.

[0018] Optionally, when the driving plate is in the initial state, the first initial gap is equal to the current deformation of the first elastic member.

[0019] Optionally, the driving plate includes an upper top plate and a lower top plate, and the first direct ejector rod movably passes through the upper top plate;

[0020] The first elastic member is matched with the first direct ejector rod through a bolt. The bolt axially passes through the lower top plate and is fixed to the end of the first direct ejector rod away from the molding cavity through a threaded structure. The first elastic member is clamped between the nut of the bolt and the lower top plate.

[0021] Optionally, a stepped hole is provided on the surface of the lower top plate away from the molding cavity. The bolt passes through the small hole of the stepped hole, and the first elastic member is placed in the large hole of the stepped hole.

[0022] Optionally, the injection mold with local delayed ejection further includes a second direct ejector rod and a second direct ejector block. The second direct ejector block is installed at one end of the second direct ejector rod close to the molding cavity. The second direct ejector rod and the second direct ejector rod are driven by the same driving plate. When the driving plate is in the initial state, the end of the second direct ejector rod away from the molding cavity is in contact and cooperation with the driving plate.

[0023] Optionally, the injection mold with local delayed ejection further includes a second ejector rod and a second ejector block. The second ejector block is installed at one end of the first ejector rod close to the forming cavity. The second ejector rod and the first ejector rod are driven by the same driving plate. In the initial state of the driving plate, there is a second initial interval between the end of the second ejector rod away from the forming cavity and the driving plate, and the second initial interval is smaller than the first initial interval. The second ejector rod is tightened by a second elastic member in the moving mold side direction.

[0024] As described above, the injection mold with local delayed ejection of the present invention has at least the following beneficial effects:

[0025] Through the design of the first elastic member, the first ejector rod can be in a tightened state, and the first ejector rod is tightened to prevent the driving plate from driving the first ejector rod and the first ejector block thereon to move slightly forward due to friction during the sliding process. Through the design of the initial interval, during the driving process of the driving plate, compared with the forming of other parts, the first ejector rod can contact the driving plate later, and the first ejector block can eject and form later. The area with obvious ejector block marks in the local area of the product no longer forms a vacuum, and the areas with ribs around have been loosened, and the clamping force is no longer too large. At this time, when the product is ejected, no ejector block marks are generated locally, thus completely solving the problem of serious ejector block marks in the local area of the product appearance, ensuring the good appearance of the product, greatly improving the product qualification rate, expanding the process parameter range, shortening the production cycle, no longer extending the cooling time, etc., saving costs and ensuring stable production. Thus, the problem of ejector block marks that has long troubled injection molding production is fundamentally solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It shows a schematic diagram of the injection mold with local delayed ejection of the present invention.

[0027] Figure 2 It shows a schematic diagram of the cooperation of the first ejector rod, the first elastic member and the driving plate of the present invention.

[0028] Element number description: moving mold 1, fixed mold 2, first ejector rod 3, first ejector block 4, forming cavity 5, driving plate 11, first elastic member 31, first initial interval 32, upper top plate 111, lower top plate 112, stepped hole 1121, bolt 310, second ejector rod 6, second ejector block 7. DETAILED DESCRIPTION OF THE INVENTION

[0029] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0030] Please refer to Figures 1 to 2It should be noted that the structures, proportions, sizes, etc. shown in the accompanying drawings of this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Therefore, they do not have any technical substance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of implementation of the present invention.

[0031] The following various embodiments are only for illustration. Combinations can be made between the various embodiments, and it is not limited to the content shown in the following single embodiment.

[0032] Please refer to Figures 1 to 2 , an embodiment of an injection mold with local delayed ejection provided by the present invention includes: a moving mold 1, a fixed mold 2, a first straight ejector rod 3, and a first straight ejector block 4; a forming cavity 5 is formed between the moving mold 1 and the fixed mold 2. The moving mold 1 includes a driving plate 11. The first straight ejector rod 3 is placed inside the moving mold 1, and the driving plate 11 can push the first straight ejector rod 3 in the mold closing direction; the first straight ejector block 4 is installed at one end of the first straight ejector rod 3 close to the forming cavity 5; a first elastic member 31 is provided at the end of the first straight ejector rod 3 away from the forming cavity 5. The first elastic member 31 is installed at the end of the first straight ejector rod 3 away from the forming cavity 5, and the first elastic member 31 is used to tension the first straight ejector rod 3 in the side direction of the moving mold. When the driving plate 11 is in the initial state, a first initial interval 32 is provided between the first straight ejector rod 3 and the driving plate 11. Through the design of the first elastic member 31, the first straight ejector rod 3 can be in a tensioned state, tensioning the first straight ejector rod 3 to prevent the driving plate 11 from driving the first straight ejector rod 3 and the first straight ejector block 4 thereon to move slightly forward due to friction during the sliding process. Through the design of the initial interval, during the driving process of the driving plate 11, compared with the forming of other parts, the first straight ejector rod 3 can contact the driving plate 11 later, and the first straight ejector block 4 can eject and form later. The area where there are obvious ejector block marks in the local area of the product no longer forms a vacuum, and the areas with ribs around have been loosened, and the clamping force is no longer too large. At this time, when the product is ejected, no ejector block marks are locally generated, thus completely solving the problem of serious ejector block marks in the local area of the product appearance, ensuring the good appearance of the product, greatly improving the product qualification rate, expanding the process parameter range, shortening the production cycle, no longer extending the cooling time, etc., saving costs and ensuring stable production. Thus, the problem of ejector block marks that has long troubled injection molding production is fundamentally solved.

[0033] In this embodiment, the forming thickness at the position of the first direct top block 4 is less than the forming thickness at one or several places on the circumferential side of the first direct top block 4. Optionally, the circumferential side of the first direct top block 4 is a rib forming cavity. For example, only one place on the side of the first direct top block 4 has a rib forming cavity. Optionally, the circumferential side of the first direct top block 4 is a doghouse forming cavity. In addition to these two specific structures, it can also be other structures with a larger thickness.

[0034] In this embodiment, the forming thickness at the position of the first direct top block 4 is less than the forming thickness at each place on the circumferential side of the first direct top block 4. Optionally, the circumferential side of the first direct top block 4 is a rib forming cavity. For example, the ribs corresponding to be formed on the side of the first direct top block 4 are annularly arranged around the corresponding structure of the first direct top block 4. In addition to this specific structure of the rib, it can also be other structures with a larger thickness.

[0035] In this embodiment, when the drive plate 11 is in the initial state, the first initial interval 32 and the current deformation amount of the first elastic member 31 are equal. When the first elastic member 31 is not compressed or in the extended state, the drive plate 11 and the first direct ejector rod 3 just contact.

[0036] In this embodiment, please refer to Figures 1 to 2 , the drive plate 11 includes an upper top plate 111 and a lower top plate 112, and the first direct ejector rod 3 movably passes through the upper top plate 111; the first elastic member 31 is matched with the first direct ejector rod 3 through a bolt 310, the bolt 310 axially passes through the lower top plate 112 and is fixed to the end of the first direct ejector rod 3 away from the forming inner cavity 5 through a threaded structure, and the first elastic member 31 is clamped between the nut of the bolt 310 and the lower top plate 112. Optionally, a stepped hole 1121 is provided on the surface of the lower top plate 112 away from the forming inner cavity 5, the bolt 310 passes through the small hole of the stepped hole 1121, and the first elastic member 31 is placed in the large hole of the stepped hole 1121. The first elastic member 31 can be a spring. In Figure 1 and Figure 2In the initial state, the spring is compressed and the first straight ejector rod 3 is pulled downward tightly to prevent it from moving during the mold closing process and affecting the molding accuracy. The first elastic member 31 is installed through the bolt 310. On the one hand, it is convenient for disassembly and replacement. On the other hand, it is convenient to adjust the pre-tightening degree of the first elastic member 31. During mold closing, under the action of external power, the lower top plate 112 is driven to move towards the fixed mold side. The lower top plate 112 and the upper top plate 111 move towards the fixed mold side together. When the upper surface of the lower top plate 112 contacts the first straight ejector rod 3, the first straight ejector rod 3 starts to move up and down under force. Since there are many types of injection molds, and what this application wants to protect is this key action of delayed ejection, the other parts can adopt existing mold structures, which are clearly known to those skilled in the art and will not be elaborated here. In actual use, the relative position relationship between the moving mold 1 and the fixed mold 2 may not be Figure 1 and Figure 2 the up-and-down relationship shown, and it can also be a left-right relationship or other position relationships when set obliquely. The up-and-down in this embodiment is only described in combination with the attached drawings.

[0037] In this embodiment, please refer to Figures 1 to 2 , the injection mold with local delayed ejection further includes a second straight ejector rod 6 and a second straight ejector block 7. The second straight ejector block 7 is installed at one end of the second straight ejector rod 6 close to the molding cavity 5. The second straight ejector rod 6 and the first straight ejector rod 3 are driven by the same driving plate 11. In the initial state of the driving plate 11, the end of the second straight ejector rod 6 far from the molding cavity 5 is in contact and cooperation with the driving plate 11. When the lower top plate 112 moves towards the fixed mold side, the second straight ejector rod 6 can respond in time, and the first straight ejector rod 3 responds with a delay.

[0038] In this embodiment, the injection mold with local delayed ejection further includes a second ejector rod 6 and a second ejector block 7. The second ejector block 7 is installed at one end of the second ejector rod 6 close to the molding cavity 5. The second ejector rod 6 and the first ejector rod 3 are driven by the same driving plate 11. In the initial state of the driving plate 11, there is a second initial interval 0 between the end of the second ejector rod 6 far from the molding cavity 5 and the driving plate 11, and the second initial interval 0 is smaller than the first initial interval 32. The second ejector rod is pulled tightly in the moving mold side direction by a second elastic member, and the installation structure of the second elastic member can be similar to that of the first elastic member and will not be elaborated here. When the lower top plate 112 moves towards the fixed mold side direction, the distance between the lower end of the second ejector rod 6 and the upper end surface of the lower top plate 112 becomes shorter and shorter. When the upper surface of the lower top plate 112 contacts the lower end of the second ejector rod 6, the second ejector rod 6 is driven by the driving plate 11 to move towards the fixed mold side direction. The lower top plate 112 continues to move towards the fixed mold side direction. When the lower end of the first ejector rod 3 contacts the upper surface of the lower top plate 112, the first ejector rod 3, the second ejector rod 6 and the lower top plate 112 move synchronously towards the fixed mold side direction, realizing the delayed response of the first ejector rod 3 relative to the second ejector rod 6.

[0039] In summary, due to the existence of the first elastic member 31 in the present invention, during the driving process of the driving plate 11, relative to the molding of other parts, the first ejector rod 3 can contact the driving plate 11 later, and the first ejector block 4 can eject and mold later. The area with obvious ejector block marks in the local area of the product no longer forms a vacuum, and the areas with ribs around have been loosened, and the holding force is no longer too large. At this time, when the product is ejected, no ejector block marks are locally generated, thus completely solving the problem of serious ejector block marks in the local area of the product appearance, ensuring the good appearance of the product, greatly improving the product qualification rate, expanding the process parameter range, shortening the production cycle, no longer prolonging the cooling time, etc., saving costs and ensuring stable production. Therefore, the problem of ejector block marks that has long troubled injection molding production is fundamentally solved. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0040] The above embodiments merely illustrate the principles and effects of the present invention and are not used to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. An injection mold with local delayed ejection, characterized in that, Comprising: Moving mold, fixed mold, first straight ejector rod and first straight ejector block; A molding cavity is formed between the moving mold and the fixed mold. The moving mold includes a driving plate. The first straight ejector rod is placed inside the moving mold, and the driving plate can push the first straight ejector rod in the mold closing direction; The first straight ejector block is installed at one end of the first straight ejector rod close to the molding cavity; One end of the first straight ejector rod far from the molding cavity is provided with a first elastic member. The first elastic member is installed at one end of the first straight ejector rod far from the molding cavity. The first elastic member is used to tension the first straight ejector rod in the side direction of the moving mold. When the driving plate is in the initial state, there is a first initial gap between the first straight ejector rod and the driving plate; When the driving plate is in the initial state, the first initial gap is equal to the current deformation amount of the first elastic member; The injection mold with local delayed ejection further includes a second straight ejector rod and a second straight ejector block. The second straight ejector block is installed at one end of the second straight ejector rod close to the molding cavity. The second straight ejector rod and the second straight ejector rod are driven by the same driving plate. When the driving plate is in the initial state, the end of the second straight ejector rod far from the molding cavity is in contact and cooperation with the driving plate.

2. The injection mold with local delayed ejection according to claim 1, wherein: The molding thickness at the position of the first straight ejector block is less than the molding thickness at a certain place or several places on the circumferential side of the first straight ejector block.

3. The injection mold with local delayed ejection according to claim 1, wherein: The molding thickness at the position of the first straight ejector block is less than the molding thickness at each place on the circumferential side of the first straight ejector block.

4. The injection mold with local delayed ejection according to claim 2 or 3, characterized in that: The circumferential side of the first straight ejector block is a rib forming cavity.

5. The injection mold with local delayed ejection according to claim 2 or 3, characterized in that: There is a doghouse forming cavity on the circumferential side of the first straight ejector block.

6. The injection mold with local delayed ejection according to claim 1, characterized in that: The driving plate includes an upper top plate and a lower top plate. The first straight ejector rod movably passes through the upper top plate; The first elastic member is matched with the first straight ejector rod through a bolt. The bolt axially movably passes through the lower top plate and is fixed to the end of the first straight ejector rod far from the molding cavity through a threaded structure. The first elastic member is clamped between the nut of the bolt and the lower top plate.

7. The injection mold with local delayed ejection according to claim 6, characterized in that: The surface of the lower top plate far from the molding cavity is provided with a stepped hole. The bolt passes through the small hole of the stepped hole, and the first elastic member is placed in the large hole of the stepped hole.

8. The injection mold with local delayed ejection according to claim 1, characterized in that: The injection mold with local delayed ejection further includes a second straight ejector rod and a second straight ejector block. The second straight ejector block is installed at one end of the first straight ejector rod close to the molding cavity. The second straight ejector rod and the second straight ejector rod are driven by the same driving plate. When the driving plate is in the initial state, there is a second initial gap between the end of the second straight ejector rod far from the molding cavity and the driving plate. The second initial gap is less than the first initial gap. The second straight ejector rod is tensioned by a second elastic member in the side direction of the moving mold.

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