A mold facilitating demolding

Abstract

The utility model provides a mould convenient to demould relates to hot press forming field, include: upper and lower die unit, the upper die unit includes the upper die plate, and the lower die unit includes the lower die plate, be provided with the mould core subassembly between the upper die plate, the mould core subassembly is used for pressing into the semi -finished product with the composite material, the upper die unit still includes push pin subassembly and push board, push board sets up in the below of upper die plate and has with the through slot of mould core subassembly match, push board can be close to or far from the upper die plate, push pin subassembly includes push pin, push pin passes and is equipped in the upper die plate and push board, and moves along the thickness direction of upper die unit, a plurality of push pin subassembly surrounds the arrangement of mould core subassembly, the direction of lower die plate to upper die unit is provided with the needle slot, each needle slot is located on each push pin's movement path one to one correspondence, the front end of push pin has the convex part, the convex part is used for the edge material of positive direction to stab into the semi -finished product and hinders the edge material and the convex part reverse to separate, realizes the automation separation of semi -finished product and mould, need not the intervention of artificial or mechanical hand.

Description

Technical Field

[0001] This utility model relates to the field of hot pressing molding, and in particular to a mold that is easy to demold. Background Technology

[0002] EVA composite material, as a common polymer material, is widely used in the manufacture of products with certain structural strength requirements, such as pencil cases and bag shells. These products are usually prepared by hot pressing molding. Specifically, the EVA composite material is placed in a preheated mold, and the mold is closed under the drive of a hydraulic press. Under the combined action of temperature and pressure, the material softens and fills the mold cavity, and is then cured under pressure to form the final product.

[0003] However, due to the high viscosity of EVA composite materials, the semi-finished products after molding are prone to adhering to the surface of the upper or lower mold. Currently, before subsequent processes, manual or robotic arms are needed to peel the semi-finished products off the mold surface, resulting in low production efficiency, high labor costs, and poor operational consistency.

[0004] Currently, there is no solution to address the aforementioned mold sticking problem that can achieve automated demolding while integrating the structure within the mold. Utility Model Content

[0005] This invention provides a mold that facilitates demolding, aiming to solve the problem of low production efficiency caused by molded parts sticking to the mold due to the high viscosity of EVA material, requiring manual or external mechanical assistance for demolding.

[0006] To achieve the above objectives, embodiments of this utility model provide a mold that facilitates demolding, comprising:

[0007] An upper mold unit and a lower mold unit, wherein the lower mold unit is disposed below the upper mold unit;

[0008] The upper mold unit includes an upper template, the lower mold unit includes a lower template, and a mold core assembly is provided between the upper template and the lower template. The mold core assembly is used to press the composite material into a semi-finished product.

[0009] The upper mold unit further includes a push pin assembly and a push plate. The push plate is disposed below the upper mold plate and has a through groove that matches the mold core assembly. The push plate can move closer to or further away from the upper mold plate. The push pin assembly includes push pins that pass through the upper mold plate and the push plate and move along the thickness direction of the upper mold unit. A plurality of push pin assemblies are arranged around the mold core assembly.

[0010] The lower template is provided with needle grooves in the direction of the upper mold unit, and each needle groove is located on the movement path of each push needle in a corresponding manner.

[0011] The front end of the pusher has a protrusion, which is used to insert into the edge material of the semi-finished product in the forward direction and prevent the edge material from separating from the protrusion in the reverse direction.

[0012] Preferably, the protrusion is spindle-shaped, and the protrusion includes a central part and a truncated cone and a cone body disposed on both sides of the central part. The thin end of the truncated cone is connected to the push needle, and the cone body is used to pierce the edge material. The cone apex angle of the cone body is smaller than the cone apex angle of the truncated cone.

[0013] Preferably, the upper mold unit further includes a push cylinder, which is disposed above the upper mold plate. The movable end of the push cylinder passes through the upper mold plate and is connected to the push plate to drive the push plate closer to or away from the upper mold plate.

[0014] Preferably, an upper mold base plate is further provided above the upper mold unit, and the upper mold base plate is detachably provided above at least one of the upper mold plates;

[0015] The pusher assembly is fixed on the upper mold base plate, and the pusher passes through the upper mold base plate, the upper template plate, and the pusher plate.

[0016] Preferably, the upper mold base plate, the upper template plate and the push plate are provided with push pin holes for push pins to pass through, and push pin guide sleeves are provided in the push pin holes, with the push pin guide sleeves protruding from the lower surface of the push plate;

[0017] The needle groove is a T-shaped stepped hole, which includes a first-order hole and a second-order hole located below the first-order hole. The first-order hole is used to accommodate the pusher guide sleeve, and the second-order hole is used to accommodate the pusher.

[0018] Preferably, the mold core assembly includes a mold core and a mold groove. The mold core is detachably disposed on the lower surface of the upper mold plate, and the mold groove is formed on the upper surface of the lower mold plate. The positions of the mold core and the mold groove correspond.

[0019] Preferably, an insert is detachably provided in the mold groove, the insert having a mold core cavity with the same shape as the mold core, the mold core and the insert being molded together and the composite material being pressed in the mold core cavity.

[0020] Preferably, the inner sidewall of the mold groove is formed with a step, and the insert is disposed on the step;

[0021] A pad is also provided inside the mold groove, which is used to fill the gap formed between the insert and the mold groove.

[0022] Preferably, the step is further provided with a limiting component for limiting the position of the insert.

[0023] The above-mentioned solution of this utility model has the following beneficial effects:

[0024] In this application, by installing a push pin assembly with a protrusion in the upper mold unit, the protrusion inserts into the edge material of the semi-finished product when the mold is opened. The protrusion prevents the push pin assembly from separating from the edge material, thereby achieving the separation of the semi-finished product from the lower mold unit. Subsequently, the push plate moves to push the semi-finished product down from the upper mold unit, thereby achieving the separation of the semi-finished product from the upper mold unit.

[0025] The use of the push pin assembly and push plate in this application enables automated separation of semi-finished products from molds without the need for manual or robotic intervention, thus eliminating process steps and improving production efficiency.

[0026] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the semi-finished product after hot pressing.

[0028] Figure 2 This is a schematic diagram of the present invention;

[0029] Figure 3 This is a top view of the upper mold base plate and the upper mold unit;

[0030] Figure 4 yes Figure 3 A schematic diagram of the AA direction;

[0031] Figure 5 yes Figure 3 A bottom view;

[0032] Figure 6 yes Figure 5 Diagram of the BB direction;

[0033] Figure 7 yes Figure 5 Diagram of the CC direction;

[0034] Figure 8 This is a schematic diagram of the lower mold unit in the first embodiment;

[0035] Figure 9 This is a schematic diagram of the needle groove on the lower template;

[0036] Figure 10 This is a schematic diagram of the pusher assembly;

[0037] Figure 11 yes Figure 10 Enlarged view of section D;

[0038] Figure 12 This is an exploded view of the lower mold unit in the second embodiment;

[0039] Figure 13This is a top view of the lower mold unit in the second embodiment;

[0040] Figure 14 yes Figure 13 A cross-sectional view along the EE direction.

[0041] [Explanation of Labels in the Attached Images]

[0042] 001-Scraps,

[0043] 100-Upper mold unit, 110-Upper template, 120-Push pin assembly, 121-Push pin, 122-Protrusion, 123-Middle part, 124-Frustum, 125-Cone, 126-Push pin guide sleeve, 127-Linear motion module, 130-Push plate, 140-Push cylinder;

[0044] 200-Lower mold unit, 210-Lower template, 211-Needle groove, 212-First-order hole, 213-Second-order hole, 220-Positioning pin;

[0045] 310-Mold core, 320-Mold groove, 321-Insert, 322-Mold core cavity, 323-Table, 324-Pad, 325-Limiting component;

[0046] 400-upper mold base plate. Detailed Implementation

[0047] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0048] like Figure 1 As shown, Figure 1 What is shown is a semi-finished product formed by hot pressing using a conventional mold. When the EVA composite material is placed into the lower mold, the upper mold moves towards the lower mold to complete the mold closing action. Under pressure and heat, the EVA composite material softens and solidifies to form the semi-finished product shown in the figure. This semi-finished product has edge material 001. When there are multiple mold cavities, multiple semi-finished products are formed simultaneously, and the multiple semi-finished products are connected by the edge material 001. The semi-finished product after hot pressing is then cut into the desired product shape by trimming the edge material 001.

[0049] like Figures 2 to 14 As shown, an embodiment of the present invention provides a mold that is easy to demold, including an upper mold unit 100 and a lower mold unit 200. The upper mold unit 100 is disposed above the lower mold unit 200. The upper mold unit 100 and the lower mold unit 200 can be moved closer or further apart by a hydraulic press to achieve mold closing or mold opening.

[0050] The upper mold unit 100 includes an upper mold plate 110, and the lower mold unit 200 includes a lower mold plate 210. A mold core assembly is provided between the upper mold plate 110 and the lower mold plate 210. The mold core assembly is used to press the aforementioned composite material into a semi-finished product.

[0051] Furthermore, the upper mold unit 100 also includes a push pin assembly 120 and a push plate 130. The push plate 130 is disposed below the upper mold plate 110 and has a through groove that matches the mold core assembly. The push plate 130 can be close to or away from the upper mold plate 110 below it. When the push plate 130 is close to the upper mold plate 110 and fits against the lower surface of the upper mold plate 110, the mold core assembly is located in the through groove. When the push plate 130 is away from the upper mold plate 110, the mold core assembly is located on the movement path of the through groove.

[0052] The aforementioned push pin assembly 120 includes a push pin 121, which passes through the upper template 110 and the push plate 130 and can move along the thickness direction of the upper mold unit 100, that is, in the same direction of movement as the push plate 130. Several push pin assemblies 120 are arranged around the mold core assembly.

[0053] A needle groove 211 is provided on the lower mold plate 210 facing the upper mold unit 100, and each needle groove 211 is located on the movement path of each push needle 121. The front end of the push needle 121 has a protrusion 122, which is used to insert into the edge material 001 of the semi-finished product in a forward direction and prevent the edge material 001 from separating from the protrusion 122 in the opposite direction. The forward movement of the protrusion 122 refers to the direction in which the push needle 121 moves towards the lower mold plate 210.

[0054] The mold provided in this application is the same as the prior art in the mold closing process, the difference being in the mold opening process. Specifically, when the mold is about to open after pressure holding and curing, the push pin 121 moves forward and punctures the edge material 001 of the semi-finished product. After the protrusion 122 passes through the edge material 001, the mold opens. Under the action of the protrusion 122 preventing the edge material 001 from separating from the push pin 121 in the opposite direction, the semi-finished product moves with the upper mold unit 100, realizing the separation of the semi-finished product from the lower mold unit 200; furthermore, the push plate 130 moves away from the upper mold plate 110, thereby pushing the semi-finished product adhering to the mold core assembly to move, so that the semi-finished product falls off the upper mold unit 100.

[0055] Since the pusher pin 121 acts on the edge material 001 that needs to be cut off in the subsequent process of the semi-finished product, the piercing of the edge material 001 by the pusher pin 121 will not affect the quality of the semi-finished product. At the same time, since the pusher plate 130 is a plate structure, it can evenly apply the force to the edge material 001, which is sufficient to generate a force to overcome the resistance between the edge material 001 and the protrusion 122, so that the semi-finished product separates from the upper mold unit 100 and achieves demolding.

[0056] It should be noted that when the push plate 130 moves away from the upper mold plate 110, the push pin 121 retracts in the opposite direction to prepare for the next forward insertion when the mold is opened.

[0057] In this embodiment, the protrusion 122 is spindle-shaped. The protrusion 122 includes a central portion 123 and a frustum 124 and a cone 125 disposed on both sides of the central portion 123. The frustum 124 has a thick end and a thin end. The thick end of the frustum 124 is connected to and the same size as the central portion 123, while the thin end of the frustum 124 is used to connect to the push pin 121. Similarly, the cone 125 also has a thick end and a thin end. The thick end of the cone 125 is connected to the central portion 123. 123 is connected and is the same size as the middle part 123. The thin end of the cone 125 serves as the front end for piercing the edge material 001. The cone apex angle r of the cone 125 is smaller than the cone apex angle R of the frustum 124. The cone apex angle of the cone 125 is smaller, and the inclination of the inclined surface of the cone 125 is smaller, making it easier for the cone 125 to pass through the edge material 001. On the other hand, the cone apex angle of the frustum 124 is larger, and the inclination of the inclined surface of the frustum 124 is larger, making it less likely to exit the edge material 001 in the opposite direction.

[0058] In this embodiment, the push pin 121 and the protrusion 122 are integrally formed. The push pin 121 is driven by a linear motion module 127 (such as a cylinder) to perform linear reciprocating motion. In this application, the telescopic end of the cylinder can also be machined into the shape of the push pin 121 and the protrusion 122.

[0059] Furthermore, the upper mold unit 100 is also provided with a push cylinder 140, which is located above the upper template 110. The upper template 110 is provided with a channel for the movable end of the push cylinder 140 to move. The movable end of the push cylinder 140 passes through the channel and is connected to the push plate 130. By extending or retracting the movable end of the push cylinder 140, the push plate 130 is brought closer to or away from the upper template 110.

[0060] An upper mold base plate 400 is also disposed above the upper mold unit 100, and the upper mold base plate 400 is detachably disposed above the upper template 110. Depending on the process, at least one upper template 110 is disposed on the lower surface of the upper mold base plate 400.

[0061] The aforementioned pusher assembly 120 and pusher cylinder 140 are fixedly mounted on the upper mold base plate 400. The pusher 121 of the pusher assembly 120 passes through the upper mold base plate 400, the upper template 110 and the pusher plate 130. The movable end of the pusher cylinder 140 passes through the upper mold base plate 400 and the upper template 110 and is fixedly connected to the pusher plate 130.

[0062] A push pin 121 hole is also provided on the upper mold base plate 400, upper template 110, and push plate 130. The push pin 121 hole extends through the upper mold base plate 400, upper template 110, and push plate 130 along the thickness direction to allow the push pin 121 to pass through. A push pin guide sleeve 126 is provided in the push pin 121 hole, and the lower end of the push pin guide sleeve 126 protrudes from the lower surface of the push plate 130. The push pin guide sleeve 126 guides the push pin 121 to move along the axial direction of the push pin guide sleeve 126, thereby preventing the push pin 121 from deviating from the area of ​​the edge material 001.

[0063] Correspondingly, to avoid collision between the push pin guide sleeve 126 and the lower mold unit 200 during mold closing, the aforementioned pin groove 211 is a T-shaped stepped hole. The stepped hole includes a first-order hole 212 and a second-order hole 213 located below the first-order hole 212. The depth of the first-order hole 212 is greater than the length of the push pin guide sleeve 126 protruding from the push plate 130, so that the first-order hole 212 can accommodate the push pin guide sleeve 126. The second-order hole 213 is located below the first-order hole 212 and coaxially connected to the first-order hole 212. The longitudinal depth of the first-order hole 212 and the second-order hole 213 is greater than the maximum length of the push pin 121 that can protrude from the push plate 130, so that the second-order hole 213 can accommodate the push pin 121.

[0064] Preferably, the upper mold base plate 400 and the upper template 110 are connected from top to bottom by bolts.

[0065] The aforementioned mold core assembly includes a mold core 310 disposed on the lower surface of the upper mold plate 110 and a mold groove 320 formed on the upper surface of the lower mold plate 210 and recessed downwards. The mold groove 320 corresponds to the position of the mold core 310. When the upper mold unit 100 and the lower mold unit 200 are closed, the mold core 310 falls into the mold groove 320 and presses the composite material in the mold groove 320 to form a semi-finished product.

[0066] In this embodiment, the mold core 310 and the mold groove 320 have the same shape, but the mold groove 320 is slightly larger. In this embodiment, in order to improve pressing efficiency, two or more mold core assemblies can be provided, and the push pin assembly 120 surrounds the area where each mold core assembly is located to pierce the edge material 001 of the outer contour of the produced semi-finished product.

[0067] To save time during model changeover, this application optimizes the aforementioned traditional mold core assembly.

[0068] Specifically, the mold core 310 and the upper template 110 are detachably connected. In this embodiment, the upper template 110 and the mold core 310 are connected from top to bottom by bolts, thereby avoiding damage to the lower surface of the mold core 310 by the bolt holes.

[0069] Correspondingly, a replaceable insert 321 is detachably provided in the mold groove 320. The insert 321 has a mold core cavity 322 with the same shape as the mold core 310. When the mold is closed, the mold core 310 and the insert 321 press the composite material in the mold core cavity 322.

[0070] Because of the use of detachable mold core 310 and insert 321, the mold core 310 and insert 321 can be replaced in pairs when switching between different models, thus saving time for mold replacement.

[0071] Furthermore, in this embodiment, the inner wall of the mold groove 320 is formed with a step, and the aforementioned insert 321 is disposed on the step. A pad 324 is also disposed in the mold groove 320. The pad 324 is disposed on the inner bottom surface of the mold groove 320, and the thickness of the pad 324 is the same as the height of the step, and the size is the same as the inner bottom surface of the mold groove 320.

[0072] The purpose of setting the steps in this embodiment is to reduce the thickness of the insert 321 and avoid the problem of inconvenience in replacing the insert 321 due to its excessive weight. The pad 324 is set to fill the gap formed between the insert 321 and the bottom surface of the mold groove 320.

[0073] Specifically, the step provided in the mold groove 320 has a platform 323, which is located in the thickness direction of the lower template 210. The insert 321 is installed on the platform 323, and the height of the platform 323 from the bottom surface of the mold groove 320 is the thickness of the pad 324.

[0074] A limiting component 325 is also provided on the step, which is used to limit the position of the insert 321. In this embodiment, a protrusion is provided on the platform 323 along the width or length direction, and a groove is provided on the outer edge of the insert 321 for the protrusion to be inserted. The insert 321 is fixed by the cooperation between the protrusion and the groove.

[0075] Preferably, the insert 321 and the platform 323 are connected from top to bottom by bolts. It should be noted that, in this application, connecting one component to another by bolts from top to bottom means that the bolts pass through the two components sequentially from above to achieve the connection between the two components.

[0076] Preferably, when the lower template 210 is provided with an insert 321, the pin groove 211 can be located on the insert 321 or on the lower template 210.

[0077] Preferably, an exhaust hole is also provided at the bottom of the mold groove 320.

[0078] Preferably, the lower template 210 is further provided with positioning posts 220, and the upper mold base plate 400 is provided with corresponding positioning holes for the positioning posts 220 to be inserted.

[0079] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A mold facilitating demolding, characterized by, include: An upper mold unit (100) and a lower mold unit (200), wherein the lower mold unit (200) is disposed below the upper mold unit (100); The upper mold unit (100) includes an upper mold plate (110), and the lower mold unit (200) includes a lower mold plate (210). A mold core assembly is provided between the upper mold plate (110) and the lower mold plate (210). The mold core assembly is used to press the composite material into a semi-finished product. The upper mold unit (100) further includes a push pin assembly (120) and a push plate (130). The push plate (130) is disposed below the upper template (110) and has a through groove that matches the mold core assembly. The push plate (130) can be close to or away from the upper template (110). The push pin assembly (120) includes a push pin (121), which passes through the upper template (110) and the push plate (130) and moves along the thickness direction of the upper mold unit (100). A plurality of push pin assemblies (120) are arranged around the mold core assembly. The lower template (210) is provided with needle grooves (211) in the direction of the upper mold unit (100), and each needle groove (211) is located on the movement path of each push needle (121) in a corresponding manner. The front end of the pusher (121) has a protrusion (122), which is used to insert into the edge material (001) of the semi-finished product in the forward direction and prevent the edge material (001) from separating from the protrusion (122) in the reverse direction.

2. The mold facilitating demolding of claim 1, wherein: The protrusion (122) is spindle-shaped and includes a middle part (123) and a truncated cone (124) and a cone (125) disposed on both sides of the middle part (123). The thin end of the truncated cone (124) is connected to the push needle (121). The cone (125) is used to pierce the edge material (001). The cone apex angle of the cone (125) is smaller than the cone apex angle of the truncated cone (124).

3. The mold facilitating demolding of claim 1, wherein: The upper mold unit (100) also includes a push cylinder (140), which is disposed above the upper template (110). The movable end of the push cylinder (140) passes through the upper template (110) and is connected to the push plate (130) to drive the push plate (130) to move closer to or away from the upper template (110).

4. The mold facilitating demolding of claim 1, wherein: An upper mold base plate (400) is also provided above the upper mold unit (100), and the upper mold base plate (400) is detachably provided above at least one of the upper mold plates (110); The pusher assembly (120) is fixed on the upper mold base plate (400), and the pusher (121) passes through the upper mold base plate (400), the upper template (110) and the push plate (130).

5. The mold facilitating demolding of claim 4, wherein: The upper mold base plate (400), upper template (110) and push plate (130) are provided with push pin (121) holes for push pins (121) to pass through. A push pin guide sleeve (126) is provided in the push pin (121) hole and the push pin guide sleeve (126) protrudes from the lower surface of the push plate (130). The needle groove (211) is a T-shaped stepped hole, which includes a first-order hole (212) and a second-order hole (213) located below the first-order hole (212). The first-order hole (212) is used to accommodate the push needle guide sleeve (126), and the second-order hole (213) is used to accommodate the push needle (121).

6. The mold facilitating demolding of claim 1, wherein: The mold core assembly includes a mold core (310) and a mold groove (320). The mold core (310) is detachably disposed on the lower surface of the upper template (110), and the mold groove (320) is formed on the upper surface of the lower template (210). The positions of the mold core (310) and the mold groove (320) correspond.

7. The mold facilitating demolding of claim 6, wherein: An insert (321) is detachably provided in the mold groove (320). The insert (321) has a mold core cavity (322) with the same shape as the mold core (310). The mold core (310) and the insert (321) are molded together and the composite material is pressed in the mold core cavity (322).

8. The mold facilitating demolding of claim 7, wherein: The inner wall of the mold groove (320) is formed with a step, and the insert (321) is disposed on the step; A pad (324) is also provided inside the mold groove (320), and the pad (324) is used to fill the gap formed between the insert (321) and the mold groove (320).

9. The mold facilitating demolding of claim 8, wherein: The step is also provided with a limiting component (325) for limiting the position of the insert (321).

Images