Multi-cavity thin-wall inverted flat cover injection mold

Abstract

The utility model provides a multi-cavity thin-wall inverted flat cover injection mold, which comprises an upper mold, a lower mold and a plurality of sub-mold core components, each sub-mold core component comprises an upper mold core and a lower mold core, the lower end of each upper mold core is provided with a molding boss, a mold core ring is sleeved outside each molding boss and can move up and down, and each sub-mold core component is provided with an upper mold core and a lower mold core. A concave cavity is formed in the top face of the lower mold core, a forming cavity used for inverted forming of the cover body is formed among the bottom face of the mold core ring, the forming boss and the concave cavity, and the upper mold is provided with a stripping driving mechanism which is connected with the mold core ring and used for driving the mold core ring to move up and down to achieve stripping. The bottom face of the forming boss is provided with an exhaust groove which is connected with a compressed air source and used for assisting stripping, and the width H of the exhaust groove is smaller than or equal to 0.02 mm. The multi-cavity thin-wall inverted flat cover injection mold disclosed by the utility model is compact in structure, high in demolding efficiency, good in demolding effect, high in production efficiency, stable and reliable in product quality, and low in manufacturing cost and maintenance cost.

Description

Technical Field

[0001] The utility model relates to a mould, in particular to a multi-cavity thin-wall inverted flat cover injection mould. Background Art

[0002] Injection molding is a method of producing industrial products. Products usually use rubber injection molding and plastic injection molding. Injection molding can also be divided into injection molding and die casting. Injection molding machine, referred to as injection machine or injection molding machine, is the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastics or thermosetting materials. Injection molding is achieved through injection molding machines and molds.

[0003] In the production process of flat covers (such as milk tea covers, coffee cup covers, etc.), in order to improve production efficiency, the injection molds currently on the market have multi-cavity injection molds that can simultaneously injection mold multiple products. Multiple cavities are processed on the template. Although multiple products can be molded at the same time, the processing cost is high and the maintenance is inconvenient. When damaged, the entire template will be scrapped. At the same time, the existing injection molding adopts forward injection molding, that is, the cover body faces downward, which affects the discharge of the product and easily causes the product to be scrapped. Utility Model Content

[0004] Technical issues to be solved

[0005] The technical problem to be solved by the utility model is to provide a multi-cavity thin-wall inverted flat cover injection mold with compact structure, low production cost and maintenance cost, convenient material discharge and high product quality.

[0006] Technical solutions to the problem

[0007] The utility model provides a multi-cavity thin-wall inverted flat cover injection mold, which includes an upper mold, a lower mold 13 and a plurality of sub-core components 4 arranged between the upper mold and the lower mold 13, the sub-core components 4 include an upper core 41 fixed on the upper mold and a lower core 42 fixed on the lower mold, the lower end of the upper core 41 is provided with a molding boss 411, the outer sleeve of the molding boss 411 is provided with a core ring 6, the core ring 6 can realize up and down movement, and its movement direction is parallel to the mold closing direction, the top surface of the lower core 42 is provided with a concave cavity, the bottom surface of the core ring 6 and the molding boss 411, The molding cavity for inverted molding of the cover body is formed between the bottom surface of the core ring 6 and the molding boss 411 and the concave cavity, the upper mold is provided with a stripping drive mechanism connected to the core ring 6 and used for driving it to move up and down to realize stripping, the bottom surface of the molding boss 411 is provided with an exhaust groove connected to a compressed air source and used for assisting stripping, and the width H of the exhaust groove is less than or equal to 0.02mm.

[0008] Furthermore, the upper mold includes a first template 11 and a second template 12 fixed at the lower end of the first template 11, an installation cavity is provided between the first template 11 and the second template 12, a push plate 3 is slidably provided in the installation cavity, a push cylinder 2 is provided on the first template 11, the output shaft of the push cylinder 2 is connected to the push plate 3 and is used to drive it to move up and down, and the lower end of the push plate 3 is provided with connecting parts of the same number as the sub-core assembly 4, and the connecting parts include multiple connecting rods 7 connected to the core ring 6.

[0009] Furthermore, the side wall of the first template 11 is provided with a first mounting groove for installing the pushing cylinder 2, and the side wall of the second template 12 is provided with a second mounting groove for accommodating the output shaft of the pushing cylinder 2. A connecting shaft 21 is provided on the output shaft of the pushing cylinder 2, and an annular groove is provided on the side wall of the connecting shaft 21. The edge of the pushing plate 3 is provided with a slot that can be inserted into the annular groove to achieve connection.

[0010] Furthermore, at least three axial holes are evenly distributed on the upper mold core 41 in the circumferential direction, and guide sleeves are provided in the axial holes, and the connecting rod 7 is slidably fitted in the sleeves.

[0011] Furthermore, a plurality of guide pillars are provided in the installation cavity, and the push plate 3 is slidably fitted on the guide pillars.

[0012] Furthermore, a connecting boss is provided at the bottom of the upper core 41 , the molding boss 411 is arranged at the lower end of the connecting boss, and the core ring 6 is sleeved outside the connecting boss.

[0013] Furthermore, the contact surface between the inner wall of the core ring 6 and the outer wall of the connecting boss is an inclined surface.

[0014] Furthermore, a hole body is opened on the bottom surface of the forming boss 411, and a core shaft 8 is arranged in the inner part of the hole body. The bottom surface of the core shaft 8 is flush with the bottom surface of the forming boss 411 and serves as a forming surface. One or more groove bodies are arranged on the side wall of the core shaft 8. An air cavity 40 is formed between the groove body and the inner wall of the hole body. The air cavity 40 is connected with the air channel 80 in the core shaft 8. There is a gap between the lower end side wall of the core shaft 8 and the hole body, and an annular exhaust groove is formed. The exhaust groove is connected with the air cavity.

[0015] Furthermore, a width H of the exhaust groove is greater than or equal to 0.005 mm and less than or equal to 0.01 mm.

[0016] Beneficial Effects

[0017] The utility model discloses a multi-cavity thin-wall inverted flat cover injection mold, adopts an inverted molding structure, has good molding effect, and is convenient for stripping; adopts a multi-sub core assembly, can realize the molding of multiple products at the same time, and has low manufacturing cost, is convenient for maintenance and servicing; a core ring structure is provided, which is used for molding and stripping of the end of the cover body, has low manufacturing cost, good molding effect, and has a large stripping contact area and good stripping effect; the core ring contacts the outer wall of the molding boss through the inclined surface, can realize automatic centering, has high precision, and has large bearing capacity and good molding effect; an exhaust groove structure is provided, which can break the vacuum phenomenon between the inner wall of the cover body and the molding boss, realize auxiliary discharging, greatly improve the stripping efficiency and effect, avoid product damage during stripping, and ensure the quality reliability of the product; adopts a core shaft structure, is easy to process, and has low manufacturing cost; a hidden push cylinder is provided, has a compact structure, is convenient for loading and unloading, and has a small installation space; the utility model discloses a multi-cavity thin-wall inverted flat cover injection mold, has a compact structure, high and good demoulding efficiency, high production efficiency, stable and reliable product quality, and low manufacturing cost and maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a multi-cavity thin-wall inverted flat cover injection mold of the utility model;

[0019] Figure 2 It is a schematic diagram of the installation of the sub-core assembly of the multi-cavity thin-wall inverted flat cover injection mold of the utility model;

[0020] Figure 3 It is a cross-sectional view of the multi-cavity thin-wall inverted flat cover injection mold of the utility model;

[0021] Figure 4 It is a cross-sectional view of a sub-core assembly of a multi-cavity thin-wall inverted flat cover injection mold of the utility model;

[0022] Figure 5 for Figure 4 Enlarged view of part A in the middle;

[0023] Figure 6 It is a structural schematic diagram of the core ring of the multi-cavity thin-wall inverted flat cover injection mold of the utility model;

[0024] Figure 7 Another planar cross-sectional view of the sub-core assembly of the multi-cavity thin-wall inverted flat cover injection mold of the utility model;

[0025] Figure 8 for Figure 7 Enlarged view of part B in the middle. DETAILED DESCRIPTION

[0026] The following is a detailed description of the embodiments of the present utility model in conjunction with the accompanying drawings.

[0027] See also Figure 1-Figure 8The utility model provides a multi-cavity thin-wall inverted flat cover injection mold, which includes an upper mold, a lower mold 13 and a sub-core assembly 4. The sub-core assembly 4 is arranged between the upper mold and the lower mold 13. In this embodiment, there are multiple sub-core assemblies 4, and each sub-core assembly 4 can realize independent molding of a product. Multiple sub-core assemblies 4 can realize simultaneous molding of multiple products, and the molding efficiency is high.

[0028] Specifically, the sub-core assembly 4 includes an upper core 41 and a lower core 42. The upper core is detachably mounted on the lower end of the upper mold, and the lower core 42 is detachably mounted on the top surface of the lower mold. The upper core 41 and the lower core 42 can achieve mold closing. In this embodiment, a molding boss 411 is provided at the lower end of the upper core 41, and a core ring 6 is provided on the outer sleeve of the molding boss 411. The core ring 6 can achieve up and down movement, and its movement direction is parallel to the mold closing direction of the upper and lower molds. A concave cavity is provided on the top surface of the lower core 42, and a molding cavity is formed between the bottom surface of the core ring 6 and the molding boss 411 and the concave cavity. The molding cavity can achieve inverted molding of the cover body, that is, the cover body faces upward; a stripping drive mechanism is provided on the upper mold, and the stripping drive mechanism is connected to the core ring 6, and is used to drive the core ring 6 to move up and down, thereby realizing product stripping.

[0029] In the present application, the outer wall of the molding boss 411 is used for the inner wall molding of the cover body, the concave cavity is used for the outer wall molding of the cover body, and the bottom surface of the core ring 6 is used for the end molding of the open end of the cover body. The cover body is stripped by moving the core ring downward. In this embodiment, a connecting boss is provided at the bottom of the upper core 41, and the molding boss 411 is arranged at the lower end of the connecting boss. The core ring 6 is sleeved outside the connecting boss, and the contact surface between the inner wall of the core ring 6 and the outer wall of the connecting boss is an inclined surface, see Figure 5 In order to improve the compactness of the overall structure, the side walls of the connecting boss and the molding boss are basically flush. The inner wall 61 of the core ring 6 serves as a limiting surface and contacts with the outer wall of the connecting boss. While limiting, it can withstand upward pressure to ensure injection pressure; the bottom surface of the core ring 6 includes a first bottom surface 62, which can contact with the top surface of the lower core to achieve limiting. The inner part of the first bottom surface 62 extends radially inward to form a second bottom surface 62a, which serves as a molding surface and forms a molding cavity between the molding boss and the concave cavity.

[0030] In this embodiment, the upper mold includes a first mold plate 11 and a second mold plate 12, the second mold plate 12 is fixed at the lower end of the first mold plate 11, and an installation cavity is provided between the first mold plate 11 and the second mold plate 12, and a push plate 3 is slidably provided in the installation cavity, and the sliding direction of the push plate 3 is parallel to the mold closing direction. Specifically, a plurality of guide pillars are provided in the installation cavity, and the push plate 3 is slidably provided on the guide pillars; a push cylinder 2 is provided on the first mold plate 11, and the output shaft of the push cylinder 2 is connected to the push plate 3 for driving the push plate 3 to move up and down. A connecting piece is provided at the lower end of the plate 3, and the number of the connecting pieces is the same as that of the sub-core assemblies 4, and they correspond one to one, and one connecting piece corresponds to one sub-core assembly 4, and each connecting piece includes a plurality of connecting rods 7, and the connecting rods 7 are connected to the core ring 6, and are further used to drive the core ring to move up and down to realize pushing and resetting; in this embodiment, at least three axial holes are evenly distributed circumferentially on the upper core 41, and the axis of the axial hole is parallel to the mold closing direction, and is evenly distributed circumferentially with the molding boss as the axis, and a guide sleeve is provided in the axial hole, and the connecting rod 7 is slidably fitted in the sleeve.

[0031] In order to facilitate loading and unloading, reduce the installation space and improve the compactness of the structure, a first mounting groove is provided on the side wall of the first template 11. The first mounting groove is multiple and symmetrically arranged on the side wall of the first template 11, which is used to install the push cylinder 2. The push cylinder is vertically fixed in the first mounting groove, and its output shaft is arranged downward. At the same time, a second mounting groove is provided on the side wall of the second template 12. The number of the second mounting grooves is the same as that of the first mounting grooves, and they correspond one to one. They are arranged below the first mounting groove and are connected to each other. The second mounting groove is used to accommodate the output shaft of the push cylinder 2. A connecting shaft 21 is provided on the output shaft of the push cylinder 2. The connecting shaft is cylindrical, and an annular groove is opened on the side wall of the connecting shaft 21. At the same time, a U-shaped groove is provided on the edge of the push plate 3, which can be inserted into the annular groove to realize the connection between the connecting shaft and the push plate. The structure is easy to install and disassemble, has a small installation space, and is compact and beautiful in appearance.

[0032] Since the cover body is a thin piece, in order to improve the stripping efficiency and avoid the formation of negative pressure between the cover body and the molding boss to damage the product during stripping, in this embodiment, an exhaust groove is provided on the bottom surface of the molding boss 411, and the exhaust groove is connected to a compressed air source, which is used to break the vacuum phenomenon between the cover body and the molding boss during stripping to achieve auxiliary stripping, and the width H of the exhaust groove is less than or equal to 0.02mm, preferably, the width H of the exhaust groove is greater than or equal to 0.005mm and less than or equal to 0.01mm; specifically, a hole body is opened on the bottom surface of the molding boss 411, and the length direction of the hole body is parallel to the mold closing direction, and a core shaft 8 is provided in the hole body, and the bottom surface of the core shaft 8 is parallel to the molding boss The bottom surface of the platform 411 is flush and serves as a molding surface. One or more grooves are provided on the side wall of the core shaft 8. The grooves are strip grooves, and their length direction is parallel to the length direction of the core shaft. An air cavity 40 is formed between the grooves and the inner wall of the hole body. At the same time, an air channel 80 connected to a compressed air source is provided in the core shaft 8. The air channel is communicated with the air cavity 40. There is a gap between the side wall of the lower end of the core shaft 8 and the hole body, and the gap forms a circular exhaust groove. The upper end of the exhaust groove is communicated with the air cavity. When demolding, first ventilate and break the vacuum there, and then move the core ring down to push the material to achieve demolding, which can improve the efficiency and effect of demolding, avoid damage to the product, and have high demolding quality, thereby ensuring the reliability of product quality.

[0033] The utility model discloses a multi-cavity thin-wall inverted flat cover injection mold, adopts an inverted molding structure, has good molding effect, and is convenient for stripping; adopts a multi-sub core assembly, can realize the molding of multiple products at the same time, and has low manufacturing cost, is convenient for maintenance and servicing; a core ring structure is provided, which is used for molding and stripping of the end of the cover body, has low manufacturing cost, good molding effect, and has a large stripping contact area and good stripping effect; the core ring contacts the outer wall of the molding boss through the inclined surface, can realize automatic centering, has high precision, and has large bearing capacity and good molding effect; an exhaust groove structure is provided, which can break the vacuum phenomenon between the inner wall of the cover body and the molding boss, realize auxiliary discharging, greatly improve the stripping efficiency and effect, avoid product damage during stripping, and ensure the quality reliability of the product; adopts a core shaft structure, is easy to process, and has low manufacturing cost; a hidden push cylinder is provided, has a compact structure, is convenient for loading and unloading, and has a small installation space; the utility model discloses a multi-cavity thin-wall inverted flat cover injection mold, has a compact structure, high and good demoulding efficiency, high production efficiency, stable and reliable product quality, and low manufacturing cost and maintenance cost.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A multi-cavity thin-wall inverted flat cover injection mold, characterized in that: It includes an upper mold, a lower mold and a plurality of sub-core assemblies arranged between the upper mold and the lower mold, the sub-core assemblies include an upper core fixed on the upper mold and a lower core fixed on the lower mold, the lower end of the upper core is provided with a molding boss, the outer sleeve of the molding boss is provided with a core ring, the core ring can realize up and down movement, and its movement direction is parallel to the mold closing direction, the top surface of the lower core is provided with a concave cavity, the bottom surface of the core ring and the molding boss, The bottom surface of the core ring and the molding cavity form a molding cavity for inverted molding of the cover body, the upper mold is provided with a stripping drive mechanism connected to the core ring and used to drive it to move up and down to realize stripping, the bottom surface of the molding boss is provided with an exhaust groove connected to a compressed air source and used to assist stripping, and the width H of the exhaust groove is less than or equal to 0.02mm.

2. The multi-cavity thin-walled inverted flat cover injection mold according to claim 1, characterized in that: The upper mold includes a first template and a second template fixed at the lower end of the first template, an installation cavity is provided between the first template and the second template, a push plate is slidably provided in the installation cavity, a push cylinder is provided on the first template, the output shaft of the push cylinder is connected to the push plate and is used to drive it to move up and down, and the lower end of the push plate is provided with connecting parts with the same number as the sub-core components and corresponding to each other, and the connecting parts include multiple connecting rods connected to the core ring.

3. The multi-cavity thin-walled inverted flat cover injection mold according to claim 2, characterized in that: The side wall of the first template is provided with a first mounting groove for installing the pushing cylinder, the side wall of the second template is provided with a second mounting groove for accommodating the output shaft of the pushing cylinder, the output shaft of the pushing cylinder is provided with a connecting shaft, the side wall of the connecting shaft is provided with an annular groove, and the edge of the pushing plate is provided with a slot that can be inserted into the annular groove to achieve connection.

4. The multi-cavity thin-walled inverted flat cover injection mold according to claim 2, characterized in that: At least three axial holes are evenly distributed on the upper mold core in the circumferential direction. A guide sleeve is arranged in the axial hole, and the connecting rod is slidably fitted in the sleeve.

5. The multi-cavity thin-walled inverted flat cover injection mold according to claim 2, characterized in that: A plurality of guide pillars are arranged in the installation cavity, and the push plate is slidably fitted on the guide pillars.

6. The multi-cavity thin-walled inverted flat cover injection mold according to claim 1, characterized in that: A connecting boss is provided at the bottom of the upper core, the forming boss is arranged at the lower end of the connecting boss, and the core ring is sleeved outside the connecting boss.

7. The multi-cavity thin-walled inverted flat cover injection mold according to claim 6, characterized in that: The contact surface between the inner wall of the core ring and the outer wall of the connecting boss is an inclined surface.

8. The multi-cavity thin-walled inverted flat cover injection mold according to claim 1, characterized in that: A hole is provided on the bottom surface of the forming boss, a core shaft is provided in the hole body, the bottom surface of the core shaft is flush with the bottom surface of the forming boss and serves as a forming surface, one or more grooves are provided on the side wall of the core shaft, an air cavity is formed between the groove and the inner wall of the hole body, the air cavity is connected with the air channel in the core shaft, a gap is provided between the lower end side wall of the core shaft and the hole body, and an annular exhaust groove is formed, and the exhaust groove is connected with the air cavity.

9. The multi-cavity thin-walled inverted flat cover injection mold according to claim 1, characterized in that: The width H of the exhaust groove is greater than or equal to 0.005 mm and less than or equal to 0.01 mm.

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