CN218196683U

CN218196683U - Joint protection mechanism of sleeve injection mold

Info

Publication number: CN218196683U
Application number: CN202222635112.7U
Authority: CN
Inventors: 蒋灵怀; 吕文进; 刘常安
Original assignee: Xingxu Medical Instrument Suzhou Co ltd
Current assignee: Xingxu Medical Instrument Suzhou Co ltd
Priority date: 2022-10-08
Filing date: 2022-10-08
Publication date: 2023-01-03
Anticipated expiration: 2032-10-08

Abstract

The utility model discloses a joint protection mechanism of a sleeve injection mold, which comprises a movable mold plate and a fixed mold plate, wherein the fixed mold plate is provided with a plurality of mold cores, the mold cores are internally provided with mold cavities, the movable mold plate is provided with a fixed mold core which corresponds to the mold cavity and can be inserted into the mold cavity, the joint protection mechanism also comprises a top mold insert, the top mold insert is fixed at the end part of the mold cavity, and the top mold insert is provided with a necking mold cavity matched with the outer wall of a necking structure of a sleeve; the movable insert is arranged in the top insert in a penetrating manner and can do linear motion along the moving direction of the fixed core, when the mold is closed, the movable insert can move up and down under the pushing of the fixed core, and forming spaces are formed among the movable insert, the outer wall of the fixed core, the cavity and the necking cavity; when the mold is opened, the movable insert moves downwards under the pulling of the sleeve formed by injection molding. The movable insert can move, and the necking structure of the sleeve is prevented from being broken when the mold is opened.

Description

Joint protection mechanism of sleeve injection mold

Technical Field

The utility model relates to an injection mold technical field especially relates to sleeve injection mold's joint protection mechanism.

Background

The injection mold is the key in the injection molding processing process, and the quality of the product quality is determined by the quality of the mold design and the precision level of the mold processing. An injection mold generally includes a movable mold assembly mounted on a movable platen of an injection molding machine and a stationary mold assembly mounted on a stationary platen of the injection molding machine. And when the mold is opened, the movable mold component and the fixed mold component are separated so as to take out the plastic product.

The sleeve 100 shown in fig. 7 has a junction with a necking structure 1a at the end, and the inner wall of the necking structure 1a is an inverted structure 1b. When the injection mold is closed, a cavity completely matched with the sleeve in shape is formed between the movable mold component and the fixed mold component, so that an insert matched with the inverted buckle structure in shape is arranged on the movable mold component. When the injection mold is opened, the insert is directly separated from the sleeve formed by injection molding, and the necking structure of the sleeve is broken due to the back-off structure, so that the product quality is influenced and the defect is caused.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects, the utility model aims to provide a sleeve injection mold's joint protection mechanism, the movable mold insert that can move about avoids telescopic throat structure to be in fracture when the die sinking.

In order to achieve the above purpose, the utility model adopts the technical scheme that: the joint protection mechanism of the sleeve injection mold comprises a movable mold plate and a fixed mold plate, wherein a plurality of mold inserts are arranged on the fixed mold plate, mold cavities are arranged in the mold inserts, fixed mold cores which correspond to the mold cavities and can be inserted into the mold cavities are arranged on the movable mold plate, the joint protection mechanism also comprises a top insert, the top insert is fixed at the end part of the mold cavities, and a necking mold cavity matched with the outer wall of a necking structure of a sleeve is arranged on the top insert; the movable insert is arranged in the top insert in a penetrating mode and can do linear motion along the moving direction of the fixed core, when the mold is closed, the movable insert can move upwards under the pushing of the fixed core, and forming spaces are formed among the outer walls of the movable insert and the fixed core, a cavity and a necking cavity; when the mold is opened, the movable insert moves downwards under the pulling of the sleeve formed by injection molding.

The beneficial effects of the utility model reside in that: the movable insert can move up and down under the pushing of the fixed core during die assembly, and is matched with the necking cavity of the top insert to complete the forming of the sleeve necking structure. Meanwhile, the movable insert can move downwards to the cavity under the pulling of the formed sleeve when the mold is opened, so that a space is provided for the elastic deformation of the necking interface of the sleeve, and the necking structure of the sleeve is prevented from being broken when the mold is opened.

Further, the movable insert comprises a guide part with a cylindrical structure, one end of the guide part is provided with a back-off forming part with a conical structure, and the back-off forming part can move back and forth between the necking cavity and the cavity. The inverted-buckle forming part is used for forming an inverted-buckle structure of the sleeve in an injection molding mode.

Further, the top insert is provided with a sliding channel coaxial with the guide part. The sliding channel provides guidance for the movement of the guide part, so that the moving stability of the movable insert is improved, and the concentricity is ensured.

Further, a stepped structure is arranged in the sliding channel, and a limiting portion capable of being abutted against the stepped structure is arranged at one end, far away from the back-off forming portion, of the guide portion. The cooperation of stair structure and spacing portion can inject movable insert's the distance that moves down, and when spacing portion and stair structure butt, movable insert can't continue to move down.

Further, the end of the fixed core is provided with a groove, and the end of the movable insert can be abutted against the fixed core and is provided with a limit column capable of being inserted into the groove. After the limiting column is firstly inserted into the groove, the end part of the fixed core is abutted against the end part of the movable insert, and the concentricity of the fixed core and the movable insert during synchronous movement is improved.

Further, the recess and the fixed core are coaxially arranged.

Further, a buffer piece is further arranged in the top insert, and the movable insert can abut against the buffer piece when moving upwards. The bolster plays the effect of shock attenuation and buffering, and during the compound die, the one end that fixed core was kept away from to the movable mold insert supports and leans on the bolster, and the bolster adopts the material that has more elasticity, can reduce the impact force of movable mold insert when just contacting with the bolster, effectively protects movable mold insert. Meanwhile, when the molding space is subjected to injection molding, the injection molding liquid can generate extrusion pressure towards the buffer piece on the movable insert, and the buffer piece tightly pushes the movable insert, so that a positioning effect is achieved.

Further, beryllium copper material is adopted as the buffer.

Drawings

FIG. 1 is a cross-sectional view of an embodiment of the present invention;

fig. 2 is a schematic position diagram of a movable insert during mold closing of the embodiment of the invention;

FIG. 3 is a schematic view of the position of the movable insert during mold opening according to the embodiment of the present invention;

FIG. 4 is an enlarged view taken at A in FIG. 3;

fig. 5 is a schematic structural view of a movable insert according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of a top insert in an embodiment of the present invention;

fig. 7 is a cross-sectional view of a sleeve in an embodiment of the invention.

In the figure:

1. moving the template; 2. fixing a template; 3. a mold core; 4. a cavity; 5. fixing a mold core; 51. a groove; 6. a top insert; 61. necking a cavity; 62. a slide channel; 63. a stepped structure; 7. a movable insert; 71. a guide portion; 72. a back-off forming part; 73. a limiting part; 74. a limiting column; 8. a buffer member;

100. a sleeve; 1a, a necking structure; 1b, a back-off structure.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.

Referring to fig. 1, the joint protection mechanism of the sleeve injection mold of the present invention includes a movable mold plate 1 and a fixed mold plate 2, the fixed mold plate 2 is fixed, and the movable mold plate 1 can be close to or away from the fixed mold plate 2 under the pushing of the injection molding machine. The fixed die plate 2 is provided with a plurality of die cores 3 capable of synchronously moving with the movable die plate 1, a die cavity 4 is arranged in each die core 3, a fixed die core 5 which corresponds to the die cavity 4 and can be inserted into the die cavity 4 is arranged on the movable die plate 1, and the fixed die core 5 and the movable die plate 1 synchronously move.

A top insert 6 is further fixed at one end of the cavity 4 far away from the movable die plate 1, and a necking cavity 61 matched with the outer wall of the necking structure 1a of the sleeve 100 is formed in the top insert 6. Referring to fig. 7, the sleeve 100 has a cylindrical structure, but the end of the sleeve 100 is provided with a necking structure 1a. Therefore, the split cavity 4 and the split top insert 6 are arranged and matched with the structure of the sleeve 100, the cavity 4 is of a cylindrical structure, the necking cavity 61 is communicated with the cavity 4, and the inner diameter of the necking cavity is smaller than that of the cavity 4.

A movable insert 7 penetrates through the top insert 6, and the movable insert 7 can do linear motion in the top insert 6 along the moving direction of the fixed core 5.

Referring to fig. 2, when the mold is closed, the movable insert 7 can move up and down under the push of the fixed core 5, and a molding space is formed between the outer wall of the movable insert 7 and the cavity 4 and the cavity 61, and the sleeve 100 is formed by injection molding towards the molding space. When the mold is opened, the movable insert 7 moves downwards under the pulling action of the sleeve 100 formed by injection molding. When the moving platen 1 moves to the first position, as shown in fig. 3 and 4, since the sleeve 100 is engaged with the movable insert 7, the movable insert 7 moves downward relative to the moving platen 2 under the limit of the sleeve 100. At this time, the necking structure 1a formed in the necking cavity 61 by the sleeve 100 moves into the cavity 4, and since the inner diameter of the cavity 4 is larger than that of the necking structure 1a, a gap is formed between the necking structure 1a and the cavity 4, and the gap provides a space for deformation of the necking structure 1a. The movable template 1 continues to move to be separated from the fixed template 2, the movable insert 7 slides to the limit position and cannot move downwards continuously, and at the moment, the movable insert 7 is separated from the sleeve 100. Since the cavity 4 has already reached the cavity 4 when the removable insert 7 is separated from the sleeve 100, the cavity 4 provides a clearance for the deformation of the cavity 1a, avoiding the breakage of the cavity 1a.

Referring to fig. 5, the removable insert 7 includes a guide portion 71 having a cylindrical structure, one end of the guide portion 71 is provided with a reverse-forming portion 72 having a tapered structure, and the reverse-forming portion 72 is disposed at one end of the guide portion 71 close to the movable platen 2. The undercut forming portion 72 is movable back and forth between the necking

cavities

61 and 4. In the reverse molded portion 72, in order to form the reverse structure 1b of the sleeve by injection molding, the diameter of the large circular surface of the reverse molded portion 72 is smaller than that of the guide portion 71.

The undercut forming portion 72 moves back and forth between the cavity 61 and the cavity 4, and the undercut forming portion 72 completes the injection molding when it is in the cavity 61. When the undercut forming portion 72 is in the cavity 4, the cavity 4 can provide a space for elastic deformation for the necking structure 1a of the injection-molded sleeve 100. The top insert 6 is provided with a sliding channel coaxial with the guide part 71, and the sliding channel provides guidance and limit for the movement of the movable insert 7.

In one embodiment, referring to fig. 6, a stepped structure 63 is disposed in the sliding channel 62, and a limit portion 73 capable of abutting against the stepped structure is disposed at an end of the guide portion 71 away from the back-off forming portion.

When the mold clamping is completed, the end of the guide portion 71 close to the undercut portion 72 is flush with the end of the slide channel 62 close to the cavity 61, and the undercut structure 1a and the undercut structure 1b of the sleeve 100 are defined between the undercut portion 72 and the cavity 61.

The step structure and the limiting portion 73 are matched to limit the downward moving distance of the movable insert 7, and when the limiting portion 73 is abutted to the step structure, the movable insert 7 cannot move under the pulling of the sleeve 100.

In one embodiment, as shown in fig. 4, the end of the fixed core 5 is provided with a groove 51, the end of the removable insert 7 can abut against the fixed core 5 and is provided with a limit post 74 capable of being inserted into the groove 51, and the groove 51 and the fixed core 5 are coaxially arranged. The matching of the groove 51 and the limiting column 74 improves the stability of the fixed core 5 in pushing the movable insert 7 to move, and simultaneously ensures the concentricity of the fixed core and the movable insert in the moving process to avoid deviation.

In one embodiment, referring to fig. 2 and 3, a cushion member 8 is further disposed in the top insert 6, and the movable insert 7 can abut against the cushion member 8 when moving upward. The buffer part 8 plays a role in shock absorption and buffering, during die assembly, one end, far away from the fixed core 5, of the movable insert 7 abuts against the buffer part 8, the buffer part 8 is made of a material with elasticity, impact force generated when the movable insert 7 is just contacted with the buffer part 8 can be reduced, and the movable insert 7 is effectively protected. Meanwhile, when the molding space is subjected to injection molding, the injection molding liquid can generate extrusion pressure towards the buffer part 8 on the movable insert 7, and the buffer part 8 tightly pushes the movable insert 7, so that the positioning effect is realized.

In one embodiment, the buffer member 8 is made of beryllium copper, which has high strength, good wear resistance, and high elasticity.

In this application, especially, the top insert 6 and the removable insert 7 are disposed in the cavity 4, and the removable insert 7 capable of forming the inverted structure 1b of the sleeve 100 is set as a movable member, so that the removable insert 7 can linearly move along the top insert 6, and the moving range is limited. When the mold is closed, the fixed core 5 pushes the movable insert 7 to move upward, and the movable insert 7 abuts against the cushion member 8 and is fixed in position. At this time, a molding space is formed between the outer wall of the movable insert 7 and the cavity 4 and the necking cavity 61, and injection molding is started to complete injection molding of the sleeve. After the injection molding is finished, the mold is opened, the first-choice movable insert 7 is pulled by the sleeve 100 formed by the injection molding to move downwards, the necking structure 1a formed by the sleeve 100 in the necking cavity 61 can move into the cavity 4, and a gap is formed between the outer wall of the necking structure 1a and the cavity 4, so that the gap provides a space for the deformation of the necking structure 1a. When the movable mold plate 1 continues to move to be separated from the fixed mold plate 2, the movable insert 7 cannot continuously move to be separated from the sleeve 100 because the distance of the movable insert 7 is limited by the stepped structure, and the fracture of the necking structure 1a of the sleeve 100 is avoided when the mold is opened.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, so as not to limit the protection scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.

Claims

1. Sleeve injection mold's joint protection mechanism, including movable mould board and fixed die plate, be provided with a plurality of benevolence on the fixed die plate, be provided with the die cavity in the mould benevolence, be provided with the fixed core that corresponds and can insert the die cavity with the die cavity on the movable mould board, its characterized in that: and also comprises

The top insert is fixed at the end part of the cavity and is provided with a necking cavity matched with the outer wall of the necking structure of the sleeve;

the movable insert is arranged in the top insert in a penetrating mode and can do linear motion along the moving direction of the fixed core, when the mold is closed, the movable insert can move upwards under the pushing of the fixed core, and forming spaces are formed among the outer walls of the movable insert and the fixed core, a cavity and a necking cavity; when the mold is opened, the movable insert moves downwards under the pulling of the sleeve formed by injection molding.

2. The joint protection mechanism of a sleeve injection mold according to claim 1, wherein: the movable insert comprises a guide part with a cylindrical structure, one end of the guide part is provided with a back-off forming part with a conical structure, and the back-off forming part can move back and forth between the necking cavity and the cavity.

3. The joint protection mechanism of a sleeve injection mold according to claim 2, wherein: the top insert is provided with a sliding channel coaxial with the guide part.

4. The joint protection mechanism of a sleeve injection mold according to claim 3, wherein: a stepped structure is arranged in the sliding channel, and a limiting part capable of being abutted against the stepped structure is arranged at one end, away from the back-off forming part, of the guide part.

5. The joint protection mechanism of a sleeve injection mold according to claim 1, wherein: the end part of the fixed core is provided with a groove, and the end part of the movable insert can be abutted against the fixed core and is provided with a limit column which can be inserted into the groove.

6. The joint protection mechanism of a sleeve injection mold according to claim 5, wherein: the groove and the fixed core are coaxially arranged.

7. The joint protection mechanism of an injection mold for a sleeve according to any one of claims 1 to 6, wherein: and a buffer piece is further arranged in the top insert, and the movable insert can abut against the buffer piece when moving upwards.

8. The joint protection mechanism of a sleeve injection mold according to claim 7, wherein: the buffer piece is made of beryllium copper.