Cavity bottom plate structure

Abstract

The utility model provides a cavity bottom plate structure, a cavity bottom plate is arranged in a gland die, the cavity bottom plate comprises a plate body and a forming bulge arranged on the plate body, the forming bulge extends towards a product and protrudes out of the plate body, the size of the forming bulge is larger than a set size, and spark patterns are arranged on the surface, close to the product, of the forming bulge. The spark patterns are set to be larger than VDI30, and after the spark patterns are formed, the size of the formed protrusions is set to be consistent with the set size. Rough spark patterns larger than VDI30 are adopted on the surfaces of the formed protrusions, and therefore flow marks are reduced in the compression molding process; and meanwhile, after rough spark pattern machining, through secondary finish turning or a corresponding finishing procedure, the size of the protrusion and the glue sealing sharp corner are restored to the set size, and dual protection on the sharp corner and the glue sealing face is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a mould field, especially suitable for a cavity bottom plate structure. BACKGROUND

[0002] The utility model relates to the field of plastic gland mould manufacturing, especially relate to the cavity bottom plate technology for pressure forming bottle cap, in the current process of using gland mould, the cavity bottom plate directly decides the appearance and forming quality of bottle cap top surface, once the improper texture setting of forming surface, often will produce flow mark on bottle cap top surface, thereby influence product appearance, at the same time, the key parts such as sealing glue sharp angle are vulnerable to damage or burr in the processing or forming process, and further cause bottle cap unable normal assembly or appearance defect, therefore, how to prevent bottle cap sealing glue sharp angle damage and burr generation while guaranteeing the flow mark improvement effect becomes a big technical difficulty in the current mould design and processing technology. SUMMARY

[0003] The utility model discloses a kind of cavity bottom plate structures to solve the above problems, by first processing relatively thick spark line, then finishing forming protrusion size, both can significantly reduce bottle cap top surface flow mark, and effectively avoid sealing glue sharp angle damage and burr generation, to ensure that bottle cap is normally assembled and appearance quality is improved.

[0004] To complete the above utility model purpose, the utility model provides a kind of cavity bottom plate structure, cavity bottom plate is set in gland mould, the cavity bottom plate includes plate body and the forming protrusion being set on plate body, the forming protrusion extends towards product and protrudes from plate body, the size of the forming protrusion is greater than set size, firework pattern is set on the face of the forming protrusion close to product, the firework pattern is set to be greater than VDI30, after forming the firework pattern, the size of the forming protrusion is consistent with set size.

[0005] Further specifically, the firework pattern is set to VDI33.

[0006] Further specifically, first chamfer is set on the end face outer edge of the plate body side close to forming protrusion, and second chamfer is set on the end face outer edge of the plate body side away from forming protrusion.

[0007] Further specifically, the angle of the first chamfer and second chamfer is set to 30-50 °.

[0008] Further specifically, the first chamfer is set to 45 °, and the second chamfer is set to 45 °.

[0009] Further specifically, cooling structure is set on the side of the plate body away from forming protrusion.

[0010] Further, the cooling structure comprises water inlet holes formed on the plate body and water grooves communicated with the water inlet holes, and the water grooves are formed on the side of the plate body away from the forming protrusions.

[0011] Further, the water inlet holes are arranged in plurality, and the plurality of water inlet holes are arranged uniformly along the circumference of the plate body.

[0012] Further, the water grooves are arranged in plurality, and the plurality of water grooves are communicated, and one water groove is connected with one water inlet hole.

[0013] Further, water passing grooves are formed on the plate body, and the water inlet holes are arranged in the water passing grooves.

[0014] Compared with the prior art, the beneficial effects of the utility model lie in that the coarse sparkles larger than VDI30 are adopted on the surface of the forming protrusions, so that the flow marks are reduced in the process of pressure plastic forming; meanwhile, the protrusion size and the sealing glue sharp angle are restored to the set size through re-machining or corresponding finishing process after the coarse sparkles are processed, so that the double protection of the sharp angle and the sealing glue surface is realized; the cooling structure is designed on the back of the plate body, the heat taking efficiency is improved, and the product quality and the production stability are further ensured. Through the above-mentioned improvement scheme, the flow mark improvement of the bottle cap and the machining precision of the sealing glue part can be better considered, and the appearance and the assembly qualification rate of the pressure plastic bottle cap are improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] The exemplary embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the embodiments described below are only used to explain the present application, and do not limit the scope of the present application. The accompanying drawings are as follows:

[0016] Figure 1 is a schematic view of the front structure of the cavity bottom plate of the utility model;

[0017] Figure 2 is a schematic view of the rear structure of the cavity bottom plate of the utility model;

[0018] Figure 3 is a schematic view of the sectional structure of the utility model; Figure 1

[0019] In the figure: 1, plate body; 2, forming protrusion; 21, sparkles; 3, water inlet hole; 4, water groove; 5, water passing groove; 6, water storage groove. DETAILED DESCRIPTION

[0020] ​For the purpose, technical scheme and advantages of the utility model, the technical scheme in the utility model embodiment will be described in more detail in the following in combination with the drawings in the utility model embodiment. In the drawings, the same or similar notations represent the same or similar elements or elements with the same or similar functions throughout. The described embodiments are part of the embodiments of the utility model, not all. The embodiments described below by reference to the drawings are exemplary and are intended to explain the utility model, and cannot be understood as limiting the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0021] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the scope of protection of the utility model. The embodiments of the utility model will be described in detail below in combination with the drawings.

[0022] It should be understood that the drawings are only used to exemplarily illustrate the present application.

[0023] A cavity bottom plate structure, as shown in Figure 1 , Figure 2 and Figure 3 , the cavity bottom plate is arranged in a cover mold, the cavity bottom plate comprises a plate body 1 and a forming protrusion 2 arranged on the plate body 1, the forming protrusion 2 extends towards the product and protrudes from the plate body 1, a spark pattern 21 is arranged on the surface of the forming protrusion 2 close to the product, the spark pattern 21 is arranged to be greater than VDI30, the forming protrusion 2 cooperates with other components, therefore, the forming protrusion has a set size to ensure that the cavity bottom plate can be inserted into other components, before the spark pattern 21 is arranged, the size of the forming protrusion 2 is arranged to be greater than the set size, after the spark pattern 21 is formed, the size of the forming protrusion 2 is arranged to be consistent with the set size, to ensure that the flow mark is reduced while the burr is reduced.

[0024] The plate body 1 is integrally formed with the formed protrusion 2. Through integral forming, the assembly error and stress concentration that may exist at the connection can be effectively reduced, the processing flow is simplified, and the overall rigidity of the plate body 1 is improved. During the processing of the spark pattern 21 and the subsequent finishing process, the integrated structure can better maintain the consistency of the size and geometric position accuracy, so that the formed protrusion 2 still maintains good surface quality and sharp corner integrity under the condition of being larger than the VDI30 spark pattern 21, further improving the assembly qualification rate and appearance stability of the bottle cap.

[0025] A first chamfer is formed on the outer edge of the end face of the plate body close to the formed protrusion, and a second chamfer is formed on the outer edge of the end face of the plate body away from the formed protrusion. The angles of the first chamfer and the second chamfer are set to 30-50°. Further specifically, the first chamfer is set to 45°, and the second chamfer is set to 45°.

[0026] During the use of the cover pressing mold, flow marks will be generated on the product. In order to reduce the flow marks, the spark pattern 21 is thickened. The thicker the spark pattern 21 is, the better. After the thickened spark pattern 21, the flow marks can be obviously reduced. However, considering the application frequency of the product, in the present scheme, the spark pattern 21 is set to VDI33. By thickening the depth of the spark pattern 21, the flow marks on the top surface of the bottle cap can be more significantly reduced. During the electric spark processing stage, the formed protrusion 2 is subjected to deeper roughness processing, so that the traces of the plastic melt flow during the molding of the bottle cap are more effectively covered. Then, the formed protrusion 2 is trimmed to the set size after the spark pattern 21 is formed, so as to avoid excessive impact of rough processing on the key parts such as the sealing glue sharp corner. Since VDI33 takes into account the improvement of the flow mark effect and the processing difficulty in actual application, the appearance quality of the bottle cap can be improved without increasing the damage risk of the sealing surface or the sharp corner. The design of the cavity bottom plate has better adaptability and effect in reducing the top surface flow marks and maintaining the molding accuracy and assembly qualification rate of the bottle cap.

[0027] However, in the existing processing method, the formed protrusion 2 is first set to the set size, and then the spark pattern 21 is processed, which will cause the formed protrusion 2 to be turned up with burrs, and the parts cannot be normally assembled. Therefore, in the present scheme, the size of the formed protrusion 2 is first set to be larger than the set size. After the spark pattern 21 is processed and formed, the formed protrusion 2 will be turned up with burrs. At this time, the formed protrusion 2 is processed again to be the set size, so as to ensure that no burrs are generated on the cavity bottom plate, and the flow marks are reduced.

[0028] The shaped protrusion 2 is inserted into other components, and the other components are machined to process the product, so the height of the shaped protrusion 2 is adapted according to the depth of the other components. The shaped protrusion is directly machined after the sparkles 21 are shaped, and after the machining of the sparkles 21 is completed, the shaped protrusion 2 is further trimmed by a finishing process, so that the end of the shaped protrusion close to the product is at a right angle, and the size is matched, which can effectively avoid the damage of the glue sealing edge of the bottle cap due to the high roughness of the sparkles 21 or the vibration of subsequent machining, and further ensure the assembly accuracy and appearance quality of the bottle cap and other components. In order to ensure the molding and sealing effect of the product, the end of the shaped protrusion is in a sharp corner state, which can avoid loose sealing or increase the risk of burr, reduce the probability of impact damage, and maintain the molding quality of the bottle cap.

[0029] A cooling structure is arranged on the side of the plate body 1 away from the shaped protrusion 2, and the cooling structure is arranged on the back of the cavity bottom plate to timely remove the heat generated in the compression molding process, so as to avoid the instability of the bottle cap molding or the size deviation caused by the increase of the mold temperature. The water tank 4, water inlet hole 5 and other basic features on the back of the plate body 1 are machined by turning and milling or cooperating with the machining center, so that the cooling channel has sufficient coverage area and water passing efficiency. Accelerating cooling can shorten the molding cycle and improve the product qualification rate, enhance the comprehensive control effect of the top surface flow mark of the bottle cap, and avoid local deformation caused by heat accumulation.

[0030] The cooling structure includes the water inlet hole 3 arranged on the plate body 1 and the water tank 4 communicated with the water inlet hole 3. The water tank 4 is arranged on the side of the plate body 1 away from the shaped protrusion 2. The water inlet hole 3 is arranged in plurality, and the plurality of water inlet holes 3 are uniformly arranged along the circumference of the plate body 1. The water inlet hole 3 penetrates the plate body 1, and a water passing groove 5 is arranged at the position of the water inlet hole 3. The water passing groove 5 is arranged in a ring shape on the plate body 1, and the plurality of water inlet holes 3 are arranged in the water passing groove 5. The water tank 4 is arranged in plurality, and the plurality of water tanks 4 are uniformly arranged on the plate body 1. The plurality of water tanks 4 are communicated, one water inlet hole 3 is connected with one water tank 4, and the plurality of water tanks 4 are uniformly arranged through the center of the plate body 1. Further, a water storage groove 64 is arranged in the middle of the plate body 1, one end of the plurality of water tanks 4 is communicated with the water passing groove 5, and the other end is communicated with the water storage groove 64.

[0031] By arranging the water inlet hole 3 on the plate body 1 and communicating it with the water tank 4, the cooling medium can be quickly injected and flow in the water tank 4 area, so as to form effective circulating cooling on the back of the cavity bottom plate. This design can expand the cooling area and reduce the local overheating phenomenon, so that the compression molding process is more stable, and further reduces the deformation or flow mark aggravation problem of the bottle cap caused by high temperature. Combined with the sparkles 21 and finishing process of the shaped protrusion 2 in advance, the bottle cap can be molded in a more optimized temperature environment, so as to further improve the overall molding quality.

[0032] By uniformly distributing a plurality of water inlet holes 3 circumferentially on the plate body 1, the cooling medium can enter and flow through the water groove 4 area from different directions at the same time, further improving the uniformity and efficiency of cooling. Compared with the way of a small number of concentrated holes, this design can more effectively avoid local overheating phenomenon and speed up the temperature balance speed, making the compression molding process more stable. After combining the spark pattern 21 and the final finishing of the protrusion, better bottle cap molding effect and quality can be obtained.

[0033] The utility model mainly aims at improving the processing problem of reducing the flow mark of the bottle cap top surface corresponding to the cavity bottom plate in the cover mold and the processing problem caused by thickening the spark pattern 21 level. First, the back surface of the plate body 1 is processed by turning and milling or numerical control machining center, so that the basic characteristics such as water hole and clamping position are in place, then the plate body 1 is turned over and semi-finish turning forming protrusion 2, so that the size of the forming protrusion 2 is larger than the set size. The spark pattern 21 refers to the surface texture formed by electric spark machining, and VDI is the commonly used spark pattern 21 depth standard in mold industry. When the spark pattern 21 level is greater than VDI30, the flow mark on the top surface of the bottle cap can be significantly reduced or covered, but if the forming protrusion 2 is machined to the final size before electric spark, the sealing glue sharp corner part is easy to be turned into burr or damaged in the subsequent process. By first processing the spark pattern 21 and then correcting the size of the forming protrusion 2, the sealing glue sharp corner can be protected during the processing of the spark pattern 21, the flow mark on the top surface can be effectively improved, and the integrity and assembly accuracy of the sealing glue part of the bottle cap can be ensured. After the spark pattern 21 is formed, the protrusion size is finally consistent with the set size by re-turning or finishing, so that the appearance and functional requirements are considered. This scheme can still protect the forming sharp corner when the spark pattern 21 level is thickened, avoid burr phenomenon, improve the qualified rate of bottle cap products, and maintain excellent appearance quality.

[0034] First, the back surface of the plate body 1 is processed by turning and milling or cooperating with the machining center, so that the clamping position, water hole and water groove 4 and other characteristics are machined, and a plurality of water inlet holes 3 and corresponding water grooves 4 are arranged according to actual needs, so that the cooling structure can be uniformly distributed on the side of the plate body 1 away from the forming protrusion 2. After machining, the thickness allowance is cut off and the plate body 1 is turned over, so that the plate body 1 is clamped on the numerical control machine tool or other precision machining equipment again, and the forming protrusion 2 area faces outward.

[0035] Then, semi-finish turning operation is carried out, the shape and sealing glue end part of the forming protrusion 2 are pre-processed to be slightly larger than the set size, a first chamfer is formed on the outer edge of the end surface of the plate body near the forming protrusion, and a second chamfer is formed on the outer edge of the end surface of the plate body away from the forming protrusion, and after semi-finish turning, electric spark machining is carried out on the surface area of the forming protrusion 2 to obtain a surface roughness greater than VDI30, preferably VDI33, so as to weaken the flow mark on the top surface of the bottle cap.

[0036] Since the EDM protrusion 2 is still slightly larger than the final size, it can be refined again using a turning or milling process, focusing on restoring the glue end size to the set value to reduce burr generation and reduce the risk of sharp corner damage. During the trimming process, fine processing can be performed on the sharp corners or glue surfaces to ensure that the sealing requirements required for bottle cap assembly are met while maintaining good appearance accuracy. Through this "first spark, then size trimming" processing sequence, both flow mark improvement and forming accuracy can be considered. Since the plate body 1 and the formed protrusion 2 are integrally formed, size stability and assembly consistency can be maintained during multiple batch production.

[0037] During production, the cavity bottom plate structure is installed in the corresponding position of the cover mold, and cooling water or oil is introduced, so that the water inlet hole 3 and the water groove 4 are in communication with each other, so that heat is quickly taken out of the mold area, reducing flow marks or deformation caused by high temperature. By using the cavity bottom plate structure and processing technology of the utility model, while ensuring that the roughness level meets the requirement of reducing flow marks, the problems of sharp corner damage and burr can be avoided, and the overall quality and assembly qualification rate of the bottle cap can be improved.

[0038] To further improve the processing efficiency and quality control of the cavity bottom plate, the spark mark 21 level can be flexibly adjusted according to different needs. If the decorative requirements of the bottle cap forming are higher, additional polishing or surface treatment process can be performed after EDM to make fine adjustments to meet more stringent appearance standards.

[0039] For large bottle caps or occasions sensitive to mold temperature gradient, the number of water inlet holes 3 can be appropriately increased and a segmented water groove 4 design can be used to further improve cooling uniformity and heat transfer efficiency. Combined with industrial internet of things or automatic production line, the temperature of the cavity bottom plate can also be monitored in real time, and the cooling water flow or temperature can be adjusted in time according to the forming temperature fluctuation.

[0040] A rough spark mark 21 larger than VDI30 is used on the surface of the formed protrusion 2 to reduce flow marks during compression molding; at the same time, after processing the rough spark mark 21, the protrusion size and glue sealing sharp corner are restored to the set size through re-turning or corresponding trimming process, achieving double protection of the sharp corner and the glue sealing surface; a cooling structure is designed on the back of the plate body 1 to improve heat removal efficiency and further ensure product quality and production stability. Through the above improvement scheme, the flow mark improvement of the bottle cap and the processing accuracy of the glue sealing part can be better considered, and the appearance and assembly qualification rate of the compression molded bottle cap can be improved.

[0041] The preferred embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the specific details in the above embodiments, and various simple modifications can be made to the technical solutions of the utility model within the technical concept of the utility model, and these simple modifications all belong to the protection scope of the utility model.

[0042] It should be further noted that the various technical features described in the above embodiments can be combined in any suitable manner, as long as they do not contradict each other, and the present application will not make any further description on various possible combinations in order to avoid unnecessary repetition.

[0043] In addition, various different embodiments of the present application can be combined in any suitable manner, as long as they do not contradict each other, and the present application should be considered as disclosing the same.

Claims

1. A cavity floor structure, the cavity floor being provided in a capping mould, characterised in that: The cavity bottom plate comprises a plate body (1) and a forming protrusion (2) arranged on the plate body (1), the forming protrusion (2) extends towards the product and protrudes from the plate body (1), the size of the forming protrusion (2) is greater than the set size, a spark pattern (21) is arranged on the surface of the forming protrusion (2) close to the product, the spark pattern (21) is arranged to be greater than VDI30, and the size of the forming protrusion (2) is set to be consistent with the set size after the spark pattern (21) is formed.

2. The cavity back structure of claim 1, wherein: The spark pattern (21) is arranged to be VDI33.

3. The cavity back structure of claim 1, wherein: A first chamfer is arranged on the outer edge of the end surface of the plate body (1) close to the forming protrusion (2), and a second chamfer is arranged on the outer edge of the end surface of the plate body (1) away from the forming protrusion (2).

4. The cavity back structure of claim 3, wherein: The angles of the first chamfer and the second chamfer are arranged to be 30-50°.

5. The cavity back structure of claim 4, wherein: The first chamfer is arranged to be 45°, and the second chamfer is arranged to be 45°.

6. The cavity back structure of claim 1, wherein: A cooling structure is arranged on the side of the plate body (1) away from the forming protrusion (2).

7. The cavity back structure of claim 6, wherein: The cooling structure comprises water inlet holes (3) arranged on the plate body (1) and water grooves (4) in communication with the water inlet holes (3), and the water grooves (4) are arranged on the side of the plate body (1) away from the forming protrusion (2).

8. The cavity back structure of claim 7, wherein: The water inlet holes (3) are arranged in plurality, and the plurality of water inlet holes (3) are uniformly arranged along the circumference of the plate body (1).

9. The cavity back structure of claim 8, wherein: The water grooves (4) are arranged in plurality, and the plurality of water grooves (4) are in communication.

10. The cavity back structure of claim 7, wherein: Water passing grooves (5) are arranged on the plate body (1), and the water inlet holes (3) are arranged in the water passing grooves (5).

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