Inner ring buckle mold stripping structure

Abstract

The invention discloses an inner ring buckle mold stripping structure which comprises a bottom plate, square iron, a plate B, a plate A, a water gap push plate and a panel which are sequentially arranged from bottom to top. An ejector base plate is further arranged on the bottom plate, and an ejector retainer plate is further connected to the ejector base plate; a front mold core is mounted at the bottom of the plate A, and a rear mold core is mounted at a position, corresponding to the front mold core, of the top of the plate B; a product forming cavity is further formed in the bottom of the front mold core, a left inner slide and a right inner slide are arranged on the two sides of the top of the plate B in a sliding mode respectively, and one end of the left inner slide and one end of the right inner slide are inserted into the product forming cavity. A shoveling machine is further installed at the bottom of the front mold core, and the lower portion of the shoveling machine is located in the middle of the interior of the product forming cavity. According to the invention, a composite core-pulling structure combining the inner slide and the inclined top is adopted, so that the defects of product strain, deformation and the like caused by a forced demolding mode are avoided, and the dimensional accuracy and the appearance quality of the product are ensured.

Description

Technical Field

[0001] This invention relates to the field of demolding technology for undercut parts of plastic products, and more particularly to an inner ring demolding structure. Background Technology

[0002] In plastic molds, products often have an inner ring undercut surface. One common method is to use a strong ejection mold, which can easily cause the small undercut surface of the product to be scratched or deformed, thus affecting the product molding and making its dimensions unable to meet the product's usage requirements. Another common method is to customize a telescopic standard part to form this inner ring, which has high manufacturing costs, complex mold structure, and is not conducive to later adjustment and maintenance. Summary of the Invention

[0003] The purpose of this invention is to provide an inner ring ejection structure, which adopts a composite core-pulling structure combining an inner sliding part and an inclined ejector, avoiding defects such as product tearing and deformation caused by forced ejection. It is particularly suitable for products with high surface quality requirements, such as food-grade ABS, ensuring product dimensional accuracy and appearance quality.

[0004] To achieve the above objectives, the following technical solution is adopted: An inner ring ejector mold structure includes, from bottom to top, a base plate, a square iron plate, a B plate, an A plate, a sprue ejector plate, and a front plate; a bottom pin plate is also arranged on the base plate, and a front pin plate is connected to the bottom pin plate; a front mold core is installed at the bottom of the A plate, and a rear mold core is installed at the top of the B plate corresponding to the front mold core; a product forming cavity is also opened at the bottom of the front mold core; a left inner slide and a right inner slide are slidably arranged on both sides of the top of the B plate, and one end of the left inner slide and the right inner slide is inserted into the product forming cavity; a scraper is also installed at the bottom of the front mold core, and the lower part of the scraper is located in the middle of the product forming cavity; the ends of the left inner slide and the right inner slide inserted into the product forming cavity each extend upward with a first forming part, and the two first forming parts are respectively located on one side of the scraper; a slanted guide post is also connected to both sides of the bottom of the A plate, and the two slanted guide posts are arranged opposite each other, and each The lower parts of the inclined guide pillars are all inclined towards the rear mold core; the left inner slide and right inner slide are provided with guide inclined holes adapted to the inclined guide pillars along the inclined direction of the inclined guide pillars, and each inclined guide pillar is arranged through a corresponding guide inclined hole; the face needle plate is connected to the ground side inclined top and the top side inclined top at the two ends below the shovel respectively, and the upper parts of the ground side inclined top and the top side inclined top are inclined towards the shovel; the upper parts of the ground side inclined top and the top side inclined top move through the B plate and the rear mold core in sequence and are inserted into the product molding cavity, and the end of the ground side inclined top and the top side inclined top inserted into the product molding cavity also extends towards the inner wall of the product molding cavity with a second molding part; the two second molding parts are respectively located at one end of the shovel; the face needle plate is also equipped with several straight tops below the product molding cavity, and the upper parts of the straight tops move through the B plate and the rear mold core in sequence and are inserted into the product molding cavity.

[0005] Furthermore, a first slide groove is formed on each of the top two sides of the B plate along its width direction, and a second slide groove communicating with the two first slide grooves is also formed on the top of the rear mold core; a guide block is also arranged on each of the inner walls of the two sides of the first slide groove; a part of the left inner slide is slidably arranged in one of the first slide grooves, and the other part of the left inner slide is slidably arranged at one end of the second slide groove; a part of the right inner slide is slidably arranged in another first slide groove, and the other part of the right inner slide is slidably arranged at the other end of the second slide groove.

[0006] Furthermore, a first insertion hole is provided in the first groove, and the lower part of the inclined guide post is inserted into the first insertion hole after passing through the guide inclined hole.

[0007] Furthermore, the lower two sides of the shovel are provided with an inwardly inclined first inclined surface, and one side of the first forming part is provided with a second inclined surface that fits against the first inclined surface.

[0008] Furthermore, a guide rod is installed vertically on the needle plate, and a limiting groove is opened at the bottom of the B plate. The upper part of the guide rod passes through the limiting groove and exits from the top of the B plate. A first spring is also sleeved on the guide rod, and the two ends of the first spring abut against the bottom of the limiting groove and the top of the needle plate, respectively.

[0009] Furthermore, an ejection limiting post is also installed on the top of the needle plate.

[0010] Furthermore, the top of the needle plate is also equipped with two inclined top seats, and each inclined top seat has a U-shaped slot at its top; a connecting shaft is connected between the inner walls on both sides of each U-shaped slot; the lower parts of the ground-side inclined top and the top-side inclined top are rotatably connected to a connecting shaft; the bottom of the B plate is also equipped with two inclined top guide blocks, and the inclined top guide blocks are also inclined with inclined top guide holes; the middle parts of the ground-side inclined top and the top-side inclined top are respectively arranged through an inclined top guide hole.

[0011] By adopting the above solution, the beneficial effects of the present invention are: This invention employs a composite core-pulling structure combining an inner core and an inclined core, avoiding defects such as product tearing and deformation caused by forced removal. It is particularly suitable for products with high surface quality requirements, such as food-grade ABS, ensuring product dimensional accuracy and appearance quality. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 A structural diagram omitting the sprue pusher plate and panel; Figure 3 for Figure 2 A structural diagram omitting board A; Figure 4 for Figure 1 A schematic diagram of the AA cross-sectional structure; Figure 5 for Figure 1 A schematic diagram of the BB cross-sectional structure; Figure 6 This is a structural diagram of the product; The following are explanations of the labels in the attached diagram: 1. Base plate; 2. Square iron; 3. B plate; 4. A plate; 5. Sprue push plate; 6. Front plate; 11. Bottom pin plate; 12. Top pin plate; 13. Ground side inclined ejector; 14. Top side inclined ejector; 15. Second forming part; 16. Straight ejector; 17. Guide rod; 18. First spring; 31. Rear mold core; 32. Left inner slide; 33. Right inner slide; 34. First forming part; 35. First slide groove; 36. First insertion hole; 37. Guide block; 41. Front mold core; 42. Scraper; 43. Inclined guide post; 44. Second inclined surface; 101. Ejection limit post; 102. Inclined ejector seat; 103. Inclined ejector guide block. Detailed Implementation

[0013] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0014] Reference Figures 1 to 5 As shown, the present invention provides an inner ring ejector mold structure, including a base plate 1, a square iron 2, a B plate 3, an A plate 4, a sprue ejector plate 5, and a front plate 6 arranged sequentially from bottom to top; a bottom pin plate 11 is also arranged on the base plate 1, and a front pin plate 12 is connected to the bottom pin plate 11; a front mold core 41 is installed at the bottom of the A plate 4, and a rear mold core 31 is installed at the top of the B plate 3 corresponding to the front mold core 41; a product forming cavity is also opened at the bottom of the front mold core 41, and left inner sliding parts 3 are slidably arranged on both sides of the top of the B plate 3. 2. One end of the right inner slide 33, and one end of the left inner slide 32 and the right inner slide 33 are inserted into the product molding cavity; a scraper 42 is also installed at the bottom of the front mold core 41, and the lower part of the scraper 42 is located in the middle of the product molding cavity; the ends of the left inner slide 32 and the right inner slide 33 inserted into the product molding cavity each extend upward with a first molding part 34, and the two first molding parts 34 are respectively located on one side of the scraper 42; a slanted guide post 43 is also connected to both sides of the bottom of the A plate 4, and the two slanted guide posts 43 are arranged opposite each other. Furthermore, the lower part of each inclined guide post 43 is inclined towards the rear mold core 31; the left inner slide 32 and the right inner slide 33 are provided with guide inclined holes adapted to the inclined guide post 43 along the inclined direction of the inclined guide post 43, and each inclined guide post 43 is arranged through a corresponding guide inclined hole; the face needle plate 12 is connected to the ground side inclined top 13 and the top side inclined top 14 at the two ends below the shovel 42, and the upper parts of the ground side inclined top 13 and the top side inclined top 14 are inclined towards the shovel 42; the ground side inclined top 13 and the top side inclined top 14 are inclined towards the shovel 42. The upper part of the top 14 moves through the B plate 3 and the rear mold core 31 in sequence and is inserted into the product molding cavity. The ends of the ground-side inclined top 13 and the top-side inclined top 14 inserted into the product molding cavity also extend towards the inner wall of the product molding cavity with a second molding part 15. The two second molding parts 15 are respectively located at one end of the shovel 42. Several straight tops 16 are also installed on the face needle plate 12 below the product molding cavity. The upper part of the straight top 16 moves through the B plate 3 and the rear mold core 31 in sequence and is inserted into the product molding cavity.

[0015] like Figure 6 As shown, the product targeted by this invention is black ABS plastic material (food product), with an outer diameter of 54mm and a height of 12mm. There is an inner ring-shaped undercut surface on its inner side, with an undercut amount of 0.88mm. The mold of this invention has two cavities and adopts a three-plate mold point gate for injection.

[0016] like Figure 1-5 As shown, to form this inner ring, a mold structure with two inner sliding positions on the left and right sides and two inclined ejectors on the top and bottom sides is used. Four straight ejectors 16 (forming positioning grooves) assist in preventing sticking to the inclined ejectors during ejection. During mold opening, the A plate 4 and sprue ejector plate 5 open for the first time, breaking the sprue. Then, during the second mold opening, the sprue ejector plate 5 and panel 6 open, and the runner and sprue automatically fall off. Then, during the third mold opening, when the A plate 4 and B plate 3 open, the shovel 42 disengages from the inner sliding surface, and under the action of the inclined guide pillars 43, the left and right inner... The slide 33 pulls the core inward at a distance of 4mm, disengaging from the undercut position. Then, the product is ejected. During the ejection process, the top and bottom side angled ejectors 13 pull the core at a distance of 4.2mm, disengaging from the undercut position. The straight ejector 16 ejects the product to prevent it from sticking to the angled ejectors. The ejection limit control sets the ejection distance to 40mm. Subsequently, the robot removes the product, the ejector plate resets, the A / B plates 3 close the mold, and the sprue plate and panel 6 close the mold. Then, the glue is injected, and the process proceeds to the next work cycle, thus meeting the normal production requirements of this type of product.

[0017] In a preferred embodiment, a first groove 35 is formed on each of the top two sides of the B plate 3 along its width direction, and a second groove communicating with the two first grooves 35 is also formed on the top of the rear mold core 31; a guide block 37 is arranged on each of the inner walls of the two sides of the first groove 35; a part of the left inner slide 32 is slidably arranged in one of the first grooves 35, and the other part of the left inner slide 32 is slidably arranged at one end of the second groove; a part of the right inner slide 33 is slidably arranged in another first groove 35, and the other part of the right inner slide 33 is slidably arranged at the other end of the second groove. A guide block 37 is provided to guide the movement of the left and right inner position 33. At the same time, a first insertion hole 36 is also provided in the first slide groove 35. The lower part of the inclined guide post 43 passes through the guide inclined hole and is inserted into the first insertion hole 36. The lower part of the shovel 42 is also provided with an inwardly inclined first inclined surface on both sides, and a second inclined surface 44 for fitting with the first inclined surface is also provided on one side of the first forming part 34.

[0018] In a preferred embodiment, a guide rod 17 is also installed on the needle plate 12 along the vertical direction, and a limiting groove is also provided at the bottom of the B plate 3. The upper part of the guide rod 17 passes through the limiting groove and extends out from the top of the B plate 3. A first spring 18 is also sleeved on the guide rod 17, and the two ends of the first spring 18 abut against the bottom of the limiting groove and the top of the needle plate 12, respectively. The guide rod 17 provides precise guidance for the vertical movement of the needle plate 12, limiting its horizontal displacement and ensuring the accurate ejection direction of the straight pin 16 and the inclined pin. Simultaneously, an ejection limiting post 101 is installed on the top of the needle plate 12, which restricts the upward movement of the needle plate 12. Furthermore, preferably, two inclined pin seats 102 are installed on the top of the needle plate 12, and each inclined pin seat 102 has a U-shaped slot at its top. A connecting shaft connects the inner walls on both sides of each U-shaped slot. The lower parts of the ground-side inclined pin 13 and the top-side inclined pin 14 are rotatably connected to a connecting shaft. Two inclined pin guide blocks 103 are installed at the bottom of the B plate 3, and inclined pin guide holes are obliquely opened on the inclined pin guide blocks 103. The middle parts of the ground-side inclined pin 13 and the top-side inclined pin 14 are arranged through an inclined pin guide hole.

[0019] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An inner ring ejector mold structure, comprising, from bottom to top, a base plate, a square iron plate, a B plate, an A plate, a sprue ejector plate, and a front plate; a bottom pin plate is further arranged on the base plate, and a front pin plate is connected to the bottom pin plate; a front mold core is installed at the bottom of the A plate, and a rear mold core is installed at the top of the B plate corresponding to the front mold core; a product forming cavity is further formed at the bottom of the front mold core, characterized in that, The top two sides of plate B are respectively equipped with a left inner slide and a right inner slide, one end of which is inserted into the product molding cavity. A scraper is also installed at the bottom of the front mold core, with its lower part located in the middle of the product molding cavity. The ends of the left and right inner slides inserted into the product molding cavity each extend upwards with a first molding part, and the two first molding parts are located on one side of the scraper. The bottom two sides of plate A are respectively connected to a slanted guide post, which is arranged opposite to the plate, with the lower part of each slanted guide post inclined towards the rear mold core. The left and right inner slides have guide holes adapted to the slanted guide posts along their inclination direction. The column is arranged through a guide angled hole; the face needle plate is connected to the ground-side angled top and the top-side angled top at the two ends below the shovel respectively, and the upper parts of the ground-side angled top and the top-side angled top are inclined towards the shovel; the upper parts of the ground-side angled top and the top-side angled top move through the B plate and the rear mold core in sequence and are inserted into the product molding cavity, and the end of the ground-side angled top and the top-side angled top inserted into the product molding cavity also extends towards the inner wall of the product molding cavity to form a second molding part; the two second molding parts are respectively located at one end of the shovel; several straight tops are also installed on the face needle plate below the product molding cavity, and the upper parts of the straight tops move through the B plate and the rear mold core in sequence and are inserted into the product molding cavity.

2. The inner ring fastening mold structure according to claim 1, characterized in that, The top two sides of the B plate each have a first slide groove along its width direction, and the top of the rear mold core also has a second slide groove that communicates with the two first slide grooves; a guide block is also arranged on the inner wall of each side of the first slide groove; a part of the left inner slide is slidably arranged in one of the first slide grooves, and the other part of the left inner slide is slidably arranged at one end of the second slide groove; a part of the right inner slide is slidably arranged in another first slide groove, and the other part of the right inner slide is slidably arranged at the other end of the second slide groove.

3. The inner ring fastening mold structure according to claim 2, characterized in that, The first groove is also provided with a first insertion hole, and the lower part of the inclined guide post is inserted into the first insertion hole after passing through the guide inclined hole.

4. The inner ring fastening mold structure according to claim 1, characterized in that, The lower two sides of the shovel are also provided with an inwardly inclined first inclined surface, and one side of the first forming part is also provided with a second inclined surface that fits with the first inclined surface.

5. The inner ring fastening mold structure according to claim 1, characterized in that, A guide rod is also installed on the needle plate along the vertical direction. A limiting groove is also opened at the bottom of the B plate. The upper part of the guide rod passes through the limiting groove and exits from the top of the B plate. A first spring is also sleeved on the guide rod, and the two ends of the first spring abut against the bottom of the limiting groove and the top of the needle plate, respectively.

6. The inner ring fastening die-casting structure according to claim 5, characterized in that, The top of the needle plate is also equipped with an ejection limiting post.

7. The inner ring fastening mold structure according to claim 6, characterized in that, The top of the needle plate is also equipped with two inclined top seats, and each inclined top seat has a U-shaped slot at its top; a connecting shaft is connected between the inner walls on both sides of each U-shaped slot; the lower parts of the ground-side inclined top and the top-side inclined top are rotatably connected to a connecting shaft; the bottom of the B plate is also equipped with two inclined top guide blocks, and the inclined top guide blocks are also inclined with inclined top guide holes; the middle parts of the ground-side inclined top and the top-side inclined top are respectively arranged through an inclined top guide hole.

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