CN219789143U

CN219789143U - Injection mold

Info

Publication number: CN219789143U
Application number: CN202320841072.3U
Authority: CN
Inventors: 胡立中; 程旭东; 陆仁杰
Original assignee: Fengwu Optoelectronics Suzhou Co ltd
Current assignee: Fengwu Optoelectronics Suzhou Co ltd
Priority date: 2023-04-17
Filing date: 2023-04-17
Publication date: 2023-10-03
Anticipated expiration: 2033-04-17

Abstract

The utility model relates to an injection mold, which comprises a lower fixed plate, a lower top plate and an upper top plate which are sequentially arranged, wherein an air cylinder groove is formed in the lower fixed plate, a piston is arranged in the air cylinder groove, a first air passage and a second air passage are formed in the lower fixed plate, the piston separates the air cylinder groove to form a first cavity and a second cavity, the first cavity is communicated with the first air passage, the second cavity is communicated with the second air passage, a push rod is connected with the piston, the push rod sequentially penetrates through the lower top plate and the upper top plate, the upper end of the push rod is positioned in a transition flow passage in a mold core, and a certain distance is reserved between the upper end of the push rod and an outlet of the transition flow passage. According to the utility model, the ejector pin is replaced by the ejector pin, and a section of uncooled cylindrical material above the ejector pin can be pushed by the ejector pin in the injection molding process, and the ejector pin can push the section of uncooled cylindrical material into a cavity in the die core, so that a final formed product cannot have the section of cylindrical pouring gate material. The procedure of secondary trimming is omitted.

Description

Injection mold

Technical Field

The utility model relates to the field of injection molding, in particular to an injection mold.

Background

The traditional ejector pin mould generally comprises a lower fixing plate, a lower top plate and an upper top plate which are sequentially arranged, wherein cushion blocks are respectively arranged on two sides of the lower top plate and the upper top plate. The upper top plate is provided with a thimble which extends into the transition flow passage in the die core. After injection molding, a cylindrical gate material is left in the liquid inlet channel. A section of cylindrical pouring gate material is correspondingly left on the injection molded product, and secondary processing is needed to cut off the section of cylindrical pouring gate material, so that time and labor are wasted.

For example, chinese patent CN201920650552.5 discloses a mold with a plunger, where the cylindrical gate material is formed, that is, the mold has the above problems.

Disclosure of Invention

Based on this, it is necessary to provide an injection mold against the problems of the conventional ejector pin type mold. The mold can avoid cylindrical gate materials on the traditional mold.

An injection mold comprises a lower fixing plate, a lower top plate and an upper top plate which are sequentially arranged, wherein a cylinder groove is arranged in the lower fixing plate, a piston is arranged in the cylinder groove, an upper sealing ring is arranged on the upper part of the piston, a lower sealing ring is arranged on the lower part of the piston, a first air passage and a second air passage are arranged on the lower fixing plate, the piston separates the cylinder groove to form a first cavity and a second cavity, the first cavity is communicated with the first air passage, and the second cavity is communicated with the second air passage,

the piston is connected with a push rod, the push rod sequentially penetrates through the lower top plate and the upper top plate, the upper end of the push rod is located in a transition flow passage in the die core, and the upper end of the push rod is a certain distance away from an outlet of the transition flow passage.

According to the utility model, the ejector pin is replaced by the ejector pin, and a section of uncooled cylindrical material above the ejector pin can be pushed by the ejector pin in the injection molding process, and the ejector pin can push the section of uncooled cylindrical material into a cavity in the die core, so that a final formed product cannot have the section of cylindrical pouring gate material. The procedure of secondary trimming is omitted.

In one embodiment, the lower fixing plate is provided with a mounting through hole, the mounting through hole is communicated with the cylinder groove, the mounting through hole is sealed through a cover plate, and the cover plate is connected with the lower fixing plate through a screw.

In one embodiment, the piston includes a first cylindrical portion, a second cylindrical portion, a third cylindrical portion, and a fourth cylindrical portion that are sequentially disposed, the diameter of the first cylindrical portion is smaller than the diameter of the second cylindrical portion, the diameter of the second cylindrical portion is larger than the diameter of the third cylindrical portion, and the diameter of the third cylindrical portion is larger than the diameter of the fourth cylindrical portion.

In one embodiment, the ejector rod is cylindrical in shape.

In one embodiment, the transition flow channel is rectilinear in shape.

In one embodiment, the mold core is further provided with an upstream runner, and the upstream runner is communicated with the transition runner.

Drawings

Fig. 1 is a perspective view of an injection mold according to an embodiment of the present utility model. The figure shows the position relationship of the lower fixing plate, the ejector rod and the die core.

Fig. 2 is a cross-sectional view of a lower fixing plate, a cylinder groove, a piston, a push rod and a mold core according to an embodiment of the present utility model.

Fig. 3 is a perspective view of a piston and ram according to an embodiment of the present utility model.

Fig. 4 is a schematic view of a product cavity inside a mold insert according to an embodiment of the present utility model.

Wherein:

101. a lower fixing plate; 102. a piston; 103. a cylinder groove; 104. a cover plate; 105. a first cavity; 106. a second cavity; 107. a second airway; 108. a first airway; 109. a lower top plate; 110. an upper top plate; 111. a first pad; 112. a second cushion block; 113. a mold core; 114. a product cavity; 115. a transition flow passage; 116. an upstream flow channel; 117. an upper sealing ring; 118. a lower sealing ring; 1021. a first cylindrical portion; 1022. a second cylindrical portion; 1023. a third cylindrical portion; 1024. a fourth cylindrical portion; 119. ejector rod, 120, headless screw.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings.

As shown in fig. 1, an embodiment of the present utility model provides an injection mold including a lower fixing plate 101, a lower top plate 109, and an upper top plate 110, which are disposed in this order. The lower fixing plate 101 is internally provided with a cylinder groove 103, the cylinder groove 103 is a groove body, the cylinder groove 103 is internally provided with a piston 102, and the piston 102 can move along the cylinder groove 103. The upper portion of piston 102 is provided with upper seal 117, the lower part of piston 102 is provided with lower seal 118, be provided with first air flue 108 and second air flue 107 on the lower fixed plate 101, piston 102 separates cylinder groove 103 and forms first cavity 105 and second cavity 106, first cavity 105 communicates with first air flue 108, second cavity 106 communicates with second air flue 107. The first air passage 108 and the second air passage 107 are connected to an air source, for example, a plurality of compressed air solenoid valves are generally provided on the molding machine, and the first air passage 108 and the second air passage 107 can be connected to corresponding valve bodies on the molding machine through corresponding pipeline assemblies. The piston 102 is connected with a push rod 119, and one end of the push rod 119 can be embedded into the piston 102. Specifically, a stepped hole may be formed in the piston 102, the ejector rod is inserted from one end of the stepped hole, a shoulder matched with the stepped hole is provided at the end of the ejector rod 119, and after the ejector rod 119 is inserted in place, the headless screw 120 is screwed into the stepped hole, so as to fix the ejector rod 119. The jack 119 passes through the lower top plate 109 and the upper top plate 110 in sequence, that is, the lower top plate 109 needs to be perforated, and the upper top plate 110 needs to be perforated for the jack 119 to pass through. The upper end of the ejector rod 119 is located in the transition runner 115 in the mold core 113, and the upper end of the ejector rod 119 is located at a certain distance from the outlet of the transition runner 115.

In the utility model, the ejector pins 119 are replaced by the ejector pins 119, in the injection molding process, the ejector pins 119 extend into the transition runner 115, and the outlet of the transition runner 115 is communicated with the product cavity 114 in the mold core 113, namely, the injection molding material enters the product cavity 114 through the transition runner 115. The ejector 119 is located in the transition flow channel 115 at a distance from the outlet of the transition flow channel 115, and the space in the distance is used for the material for injection molding to pass through. That is, the material for injection molding forms a cylindrical uncooled portion in the transition runner 115 above the ram 119. When the injection molding process enters the pressure maintaining and cooling stage, the first air passage 108 is ventilated, and after entering the first cavity 105, the air promotes the piston 102 to rise, and further promotes the ejector rod 119 to rise, and the ejector rod 119 can eject the uncooled part of the transition flow passage 115 located above the ejector rod 119 into the product cavity 114 in the mold core 113. This way, the final product is free of this cylindrical gate. The cylindrical gate is removed without secondary trimming. Saving time and labor.

Compared with the existing die, the utility model has the improvement that the piston 102, the ejector rod 119, the cylinder groove 103 and the corresponding air passages are added on the basis of the existing die, and the original ejector pins are removed, so that the ejector rod 119 replaces the original ejector pins and is opened on the upper top plate 110 and the lower top plate 109 to allow the ejector rod 119 to move up and down. The present utility model solves the problems of the prior art by a simple improvement. The whole improvement cost is low, and the universality is good. And because the injection molding amount on the molding machine can be adjusted, and the amount of molding materials in the transition runner 115 is very small, the molding materials can be pushed into the product molding cavity by the ejector rod 119, and the product is not affected.

In one embodiment, the lower fixing plate 101 is provided with a mounting through hole, which communicates with the cylinder groove 103, the mounting through hole is sealed by a cover plate 104, and the cover plate 104 is connected with the lower fixing plate 101 by a screw.

In the above structure, the mounting through hole is used to mount the piston 102 in the cylinder groove 103. After the installation is completed, the cover plate 104 is connected with the lower indefinite plate through screws, and the installation through holes are sealed.

In one embodiment, the piston 102 includes a first cylinder 1021, a second cylinder 1022, a third cylinder 1023, and a fourth cylinder 1024, where the first cylinder 1021 has a smaller diameter than the second cylinder 1022, the second cylinder 1022 has a larger diameter than the third cylinder 1023, and the third cylinder 1023 has a larger diameter than the fourth cylinder 1024. Specifically, the second cylindrical portion 1022 is provided with the lower seal ring 118, and the fourth cylindrical portion 1024 is provided with the upper seal ring 117.

In one embodiment, the lift pins 119 are cylindrical in shape. I.e. the cross section of the carrier rod 119 is circular. The corresponding transition flow channel 115 is also cylindrical in shape.

In one embodiment, the transition flow channel 115 is linear in shape. For example, the transition flow path 115 has a linear shape, and one side of the transition flow path 115 is opened and communicates with the upstream flow path 116.

Specifically, the mold core 113 is further provided with an upstream runner 116, the upstream runner 116 is communicated with the gate component of the mold, and the upstream runner 116 is also communicated with the transition runner 115. Injection molding material in the upstream runner 116 may enter the transition runner 115 and thus the product cavity 114.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. The injection mold comprises a lower fixing plate, a lower top plate and an upper top plate which are sequentially arranged, and is characterized in that an air cylinder groove is formed in the lower fixing plate, a piston is arranged in the air cylinder groove, an upper sealing ring is arranged on the upper portion of the piston, a lower sealing ring is arranged on the lower portion of the piston, a first air passage and a second air passage are arranged on the lower fixing plate, the piston separates the air cylinder groove to form a first cavity and a second cavity, the first cavity is communicated with the first air passage, the second cavity is communicated with the second air passage,

2. The injection mold of claim 1, wherein the lower fixing plate is provided with a mounting through hole, the mounting through hole is communicated with the cylinder groove, the mounting through hole is sealed by a cover plate, and the cover plate is connected with the lower fixing plate by a screw.

3. The injection mold of claim 1, wherein the piston comprises a first cylindrical portion, a second cylindrical portion, a third cylindrical portion, and a fourth cylindrical portion that are sequentially disposed, the first cylindrical portion having a diameter smaller than a diameter of the second cylindrical portion, the second cylindrical portion having a diameter greater than a diameter of the third cylindrical portion, and the third cylindrical portion having a diameter greater than a diameter of the fourth cylindrical portion.

4. The injection mold of claim 1, wherein the ejector pin is cylindrical in shape.

5. The injection mold of claim 1, wherein the transition runner is rectilinear in shape.

6. The injection mold of claim 1, wherein the mold insert is further provided with an upstream runner, the upstream runner being in communication with the transition runner.