Anti-flash die structure

Abstract

The utility model discloses an anti-flash die structure, which comprises an upper die and a lower die arranged at the bottom of the upper die, the upper die and the lower die move towards opposite directions through an external power end to realize mutual abutting of the upper die and the lower die, a lower die cavity is arranged on the top end surface of the lower die, and an anti-flash component is further arranged on the upper die and the lower die cavity. The anti-flash assembly comprises a dislocation piece, the dislocation piece is fixed on the bottom end face of the upper die, and the dislocation piece is inserted into the lower die cavity; according to the designed anti-flash assembly, the position of a closed area of an existing common die is changed, a new closed area is located at the bottom, and when the upper die and the lower die are extruded, a fluid can flow towards the middles of the upper die and the lower die, so that the pressure intensity of the fluid is small when the closed area is located at the bottom, and the probability of flash generation or the shape area of flash is reduced; and meanwhile, by means of the pressure of the liquid in the die cavity, abutting sealing of the connecting position can be achieved, and therefore the generation of flash is further reduced or even prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of molds, and particularly relates to a mold structure for preventing flash. Background Art

[0002] A mold refers to various dies and tools used in industrial production to obtain required products by means of injection molding, blow molding, extrusion, die casting, forging, smelting, stamping, etc. It is widely used in blanking, die forging, cold heading, extrusion, powder metallurgy part pressing, pressure casting, and the compression molding or injection molding of products such as engineering plastics, rubber, and ceramics.

[0003] Currently, during the production and manufacturing process of molds, a flash phenomenon will occur. Flash is also known as overflow, burr, etc., and mostly occurs at the parting positions of molds, such as the parting surface of the moving mold and the stationary mold, the sliding mating part of the slider, the clearance of the insert, the ejector pin hole, etc. Flash is largely caused by the failure of the mold or machine clamping force. A mold structure for preventing flash is disclosed in the publication number CN218799004U. This patent tightens the arc chamfer against the arc limiting groove to enhance the clamping effect and prevent the flash phenomenon caused by excessive pressure of the aluminum liquid in the mold. However, this patent mainly realizes it by changing the shape of the connection part. When the pressure of the injected fluid is too high, there is still a flash phenomenon. Therefore, in actual use, there is still room for improvement. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a mold structure for preventing flash, so as to solve the problem of flash existing in the existing molds during processing as mentioned in the above background art.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A mold structure for preventing flash, including an upper mold and a lower mold arranged at the bottom of the upper mold. During processing, the upper mold and the lower mold move towards each other through an external power end to achieve mutual tightening. A lower mold cavity is opened on the top end surface of the lower mold, and an anti-flash component is also arranged on the upper mold and the lower mold cavity. The anti-flash component includes:

[0006] A dislocation part fixed on the bottom end surface of the upper mold, and this dislocation part is inserted into the interior of the lower mold cavity;

[0007] Symmetrically arranged closing parts are located at the connection between the lower mold cavity and the dislocation part, and these symmetrically arranged closing parts can deform and bulge towards the interior of the lower mold cavity.

[0008] Preferably, the misaligned part is an upper mold cavity, the outer surface of which fits against the inner wall of the lower mold cavity. The height of the upper mold cavity is equal to the inner depth of the lower mold cavity. After the upper and lower molds are fitted together, the end of the upper mold cavity will fit against the inner end face of the lower mold cavity, thus changing the original connection position. An inner groove is provided on the inner side surface of the end of the upper mold cavity, and the closing part is arranged at the spacing between the inner groove and the lower mold cavity, so as to close the connection between the misaligned part and the lower mold cavity.

[0009] Preferably, the number of the symmetrically arranged closing parts is two. The closing part is a closing sleeve, which is integrally circular. One end of the closing sleeve is bent into a planar shape, and both closing sleeves are fixedly connected to the bottom end face of the lower mold cavity and the top end face of the inner side of the inner groove respectively through the planar regions. During processing, welding can be used for fixation. The other end of the closing sleeve extends obliquely towards the inside of the lower mold cavity, and the ends of the other ends of the two closing sleeves are in a fitting state.

[0010] Preferably, arc-shaped guide grooves are provided on the outer surface of the other ends of the two closing sleeves. The longitudinal section of the guide grooves is arc-shaped. Through the arrangement of the guide grooves, it is possible to more conveniently receive the pressure of the fluid, so as to achieve rapid closing.

[0011] Preferably, a guide post is further fixed to the bottom end face of the upper mold, and a guide hole for the guide post to penetrate is provided on the surface of the lower mold.

[0012] Preferably, the guide post is composed of an upper cylinder body and a lower cylinder body. A stud is fixed to the top of the lower cylinder body, and a threaded hole for the stud to be screwed into is provided on the bottom end face of the upper cylinder body. A sliding assembly is further sleeved outside the stud. After the stud and the threaded hole are screwed tightly, the sliding assembly can be fixed. The sliding assembly is in rolling fit with the inside of the guide hole, so as to reduce the friction between the guide post and the guide hole and achieve the purpose of rapid sliding.

[0013] Preferably, the sliding assembly includes a collar. A ring groove is provided on the top of the collar. A ball groove is provided downward on the top end face of the collar. A ball is placed in the ball groove, and the ball is in rolling connection with the guide hole. In order to prevent the ball from detaching from the ball groove, a limiting ring is further installed on the top of the collar.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] Through the designed flash prevention component, the position of the closing area of the existing ordinary mold is changed. The new closing area is at the bottom. When the upper and lower molds are extruded, the fluid will flow towards the middle of the upper and lower molds. Therefore, when the closing area is at the bottom, the pressure of the fluid is small, which reduces the probability of flash generation or the shape area of the flash. At the same time, it can also utilize the pressure of the liquid inside the mold cavity to achieve tight sealing of the connection, realizing a truly seamless fit, thereby further reducing or even preventing the generation of flash and improving the deficiencies in the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present utility model;

[0017] Figure 2 is a connection cross-sectional view of the upper mold cavity and the lower mold of the present utility model;

[0018] Figure 3 For the present utility model Figure 2 is an enlarged schematic view of area A;

[0019] Figure 4 is a top cross-sectional view of the sliding component of the present utility model.

[0020] In the figure:

[0021] 100, upper mold; 101, guide post; 101a, upper column; 101a-1, screw hole; 101b, lower column; 101b-1, stud; 102, collar; 102a, ball; 103, upper mold cavity; 103a, inner groove;

[0022] 200, lower mold; 200a, lower mold cavity;

[0023] 300, closing sleeve; 300a, guide groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0025] Please refer to Figures 1 to 4, the present utility model provides a technical solution: a mold structure for preventing flash, including an upper mold 100 and a lower mold 200 disposed at the bottom of the upper mold 100. During processing, the upper mold 100 and the lower mold 200 are moved towards each other by an external power end to achieve mutual pressing. A lower mold cavity 200a is provided on the top end surface of the lower mold 200, and an anti-flash component is also provided on the upper mold 100 and the lower mold cavity 200a. The anti-flash component includes:

[0026] A misalignment member, fixed on the bottom end surface of the upper mold 100, which is inserted into the interior of the lower mold cavity 200a. By means of the misalignment member, the original planar fitting connection mode of the upper mold 100 and the lower mold 200 is changed to an insertion connection mode, so that the connection area originally on the fitting surface of the upper mold 100 and the lower mold 200 is changed to the inner bottom end surface position of the lower mold cavity 200a. When the upper mold 100 and the lower mold 200 are pressed, the fluid inside will generate pressure due to the extrusion. At the same time, the pressure value is the largest at the middle position between the two, and the pressure at the connection position at the bottom is less than the pressure at the middle position of the upper mold 100 and the lower mold 200, achieving a reduction in the generation of flash and a decrease in the area when flash is generated;

[0027] Symmetrically arranged closing members, located at the connection between the lower mold cavity 200a and the misalignment member. The symmetrically arranged closing members can deform and bulge towards the interior of the lower mold cavity 200a. Therefore, when the fluid inside the lower mold cavity 200a presses the closing members, the closing members can change from the original direction of bulging towards the lower mold cavity 200a to a gradually vertical shape, thereby realizing the sealing of the connection.

[0028] In this embodiment, preferably, the misalignment member is an upper mold cavity 103. The outer surface of the upper mold cavity 103 fits with the inner wall of the lower mold cavity 200a. The height of the upper mold cavity 103 is equal to the inner depth of the lower mold cavity 200a. After the upper mold 100 and the lower mold 200 are fitted, the end of the upper mold cavity 103 will fit and abut against the inner end surface of the lower mold cavity 200a, thereby changing the original connection position. An inner groove 103a is provided on the inner side surface of the end of the upper mold cavity 103, and the closing member is arranged at the spacing between the inner groove 103a and the lower mold cavity 200a, thereby closing the connection between the misalignment member and the lower mold cavity 200a.

[0029] In this embodiment, preferably, the number of symmetrically arranged closing members is two. The closing member is a closing sleeve 300, which is integrally circular. One end of the closing sleeve 300 is bent into a planar shape, and both closing sleeves 300 are fixedly connected to the bottom end surface of the lower mold cavity 200a and the inner top end surface of the inner groove 103a respectively through the planar regions. During processing, welding can be used for fixation. The other end of the closing sleeve 300 extends obliquely towards the interior of the lower mold cavity 200a, and the ends of the other ends of the two closing sleeves 300 are in a fitting state. Refer to Figure 3The solid arrow indicates the flow mode of the fluid in the lower mold cavity 200a after being subjected to pressure. The fluid will squeeze the closing sleeve 300, which is made of metal and has a thickness of 3 mm. After being subjected to pressure, it will move in the direction of the dotted arrow. At this time, the closing sleeve 300 gradually changes from its original inclined state to a vertical state. At this time, the distance between the other ends of the two closing sleeves 300 will be reduced until there is no distance. At the same time, the closing sleeve 300 is vertical and will not cause any impact on the product, and can cut off the flash that has been produced.

[0030] In this embodiment, preferably, a guide groove 300a is provided on the outer surface of the other end of the two closing sleeves 300. The longitudinal section of the guide groove 300a is arc-shaped. The setting of the guide groove 300a can more conveniently receive the pressure of the fluid, thereby achieving rapid closure.

[0031] In this embodiment, preferably, a guide post 101 is fixed to the bottom end surface of the upper mold 100 , and a guide hole for the guide post 101 to pass through is opened on the surface of the lower mold 200 .

[0032] In this embodiment, preferably, the guide column 101 is composed of an upper column 101a and a lower column 101b, a stud 101b-1 is fixed to the top of the lower column 101b, and a screw hole 101a-1 is provided on the bottom end surface of the upper column 101a for the stud 101b-1 to be screwed into, and a sliding component is also sleeved on the outside of the stud 101b-1. When the stud 101b-1 and the screw hole 101a-1 are tightened, the sliding component can be fixed, and the sliding component rolls and fits with the inside of the guide hole, thereby reducing the friction between the guide column 101 and the guide hole, thereby achieving the purpose of rapid sliding.

[0033] In this embodiment, preferably, the sliding assembly includes a ring 102, the top of the ring 102 is provided with a ring groove, the top surface of the ring 102 is provided with a ball groove downwardly, a ball 102a is placed in the ball groove, the ball 102a is rollingly connected to the guide hole, in order to prevent the ball 102a from escaping from the ball groove, a limit ring is also installed on the top of the ring 102, not shown in the figure, the limit ring is fixed to the top surface of the ring 102 by welding, and in order to ensure the normal rotation of the ball 102a, the ball 102a is arranged in a rolling fit with the plane of the limit ring.

[0034] Although the embodiments of the present invention have been shown and described (see the above detailed description for details), it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flash-proof mold structure, comprising an upper mold (100), and a lower mold (200) arranged at the bottom of the upper mold (100), wherein a lower mold cavity (200a) is formed on the top surface of the lower mold (200), characterized in that: The upper mold (100) and the lower mold cavity (200a) are also provided with an anti-flash component, and the anti-flash component comprises: A dislocation piece is fixed on the bottom end surface of the upper mold (100), and the dislocation piece is inserted into the interior of the lower mold cavity (200a); The symmetrically arranged closing piece is located at the connection between the lower mold cavity (200a) and the dislocation piece, and the symmetrically arranged closing piece can be deformably raised toward the inside of the lower mold cavity (200a).

2. The anti-flash mold structure according to claim 1, characterized in that: The dislocation piece is an upper mold cavity (103), the outer surface of the upper mold cavity (103) is in contact with the inner wall of the lower mold cavity (200a), the height of the upper mold cavity (103) is equal to the inner depth of the lower mold cavity (200a), an inner groove (103a) is provided on the inner side surface of the end of the upper mold cavity (103), and the closing piece is arranged at the distance between the inner groove (103a) and the lower mold cavity (200a).

3. The anti-flash mold structure according to claim 2, characterized in that: The number of the symmetrically arranged closing parts is two, and the closing parts are closing sleeves (300). One end of the closing sleeve (300) is planar, and the two closing sleeves (300) are fixedly connected to the bottom end surface of the lower mold cavity (200a) and the inner top end surface of the inner groove (103a) through the planar area, respectively. The other end of the closing sleeve (300) extends obliquely toward the inside of the lower mold cavity (200a), and the other end portions of the two closing sleeves (300) are in a fitted state.

4. The anti-flash mold structure according to claim 3, characterized in that: A guide groove (300a) is provided on the outer surface of the other end of the two closing sleeves (300), and the longitudinal section of the guide groove (300a) is arc-shaped.

5. The anti-flash mold structure according to claim 1, characterized in that: A guide post (101) is also fixed to the bottom end surface of the upper mold (100), and a guide hole for the guide post (101) to pass through is opened on the surface of the lower mold (200).

6. The anti-flash mold structure according to claim 5, characterized in that: The guide column (101) is composed of an upper column (101a) and a lower column (101b), a stud (101b-1) is fixed on the top of the lower column (101b), and a screw hole (101a-1) for the stud (101b-1) to be screwed into is provided on the bottom end surface of the upper column (101a), and a sliding component is also sleeved on the outside of the stud (101b-1), and the sliding component is rollingly fitted with the inside of the guide hole.

7. The anti-flash mold structure according to claim 6, characterized in that: The sliding assembly comprises a collar (102), a ring groove is provided at the top of the collar (102), a ball groove is provided downwardly at the top end of the collar (102), a ball (102a) is placed in the ball groove, the ball (102a) is rollingly connected to the guide hole, and a limit ring is also installed at the top of the collar (102).

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