Splicing type die cavity exhaust structure

Abstract

The utility model provides an insert splicing type die cavity exhaust structure which comprises an insert assembly. The insert assembly comprises an insert main body and an insert pin; the insert main body is located in the insert hole, the outer side wall of the insert main body and the insert hole jointly define a plastic molding groove and a positioning hole, and the plastic molding groove is communicated with the molding cavity of the mold core; one end of the insert pin penetrates through the plastic molding groove from the positioning hole to the mold core, and one end of the insert pin, the outer side wall of the insert body and the inner wall of the insert hole jointly define a first exhaust channel and a second exhaust channel. The depth of one end of the first exhaust channel and the depth of one end of the second exhaust channel are both smaller than the edge overflow value of the plastic raw material injected and filled in the forming cavity. The exhaust structure of the mold cavity is wide in application range and good in exhaust effect so as to effectively reduce the generation of burrs and waste materials of plastic products, so that the injection consumption of plastic raw materials is reduced, and the plastic products subjected to injection molding have good appearance quality and dimensional accuracy.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust of injection mold cavities, in particular to a split-type mold cavity exhaust structure. Background Technique

[0002] In daily life, during the injection filling process of the vast majority of plastic products through injection molds, there will be problems of poor exhaust in the mold cavity, that is, air entrapment in the mold cavity, especially for complex plastic products such as the bases, rear covers, protective shells of electronic devices or those with deep cavity structures. Among them, air entrapment in the mold cavity is one of the main problems causing product molding defects such as air bubbles, material shortage, scorch marks or weld lines in plastic products.

[0003] To solve the above problem of air entrapment in the mold cavity, designers generally process exhaust grooves around the parting surface of the mold core.

[0004] As in the prior art, such as Chinese Patent Document CN207077715U, which discloses an exhaust structure for an injection mold. An overflow cavity communicating with the mold cavity is provided at the place where the injection mold needs to exhaust. The overflow cavity is also communicated with an exhaust groove, and the exhaust groove is communicated with the outside. The depth of the exhaust groove does not exceed the flash value of the plastic used in the injection mold. In this way, when injecting, the gas is driven by the molten plastic to the overflow cavity and discharged through the exhaust groove. Even defects such as scorching, poor filling, appearance damage, air bubbles, and dimensional deviation caused by poor exhaust will only occur in the plastic part filling the overflow cavity.

[0005] However, the technical solution disclosed in the above patent still has the following problems: By setting the overflow cavity to connect the exhaust groove to the mold cavity, the setting of the above overflow cavity will undoubtedly increase the injection consumption of plastic raw materials. Especially when the volume of the plastic product increases and the structure becomes more complex, the injection consumption caused by the overflow package will further increase; at the same time, the subsequent work of removing the overflow package will also be more complicated, because currently, removing the overflow package or flash waste is mostly in the way of manual scraping, so it is difficult to ensure the dimensional and appearance quality of the plastic product. Content of the Utility Model

[0006] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a split-type mold cavity exhaust structure that can effectively improve the exhaust rate of the mold cavity, effectively avoid the problem of air entrapment in the mold cavity, thereby reducing the formation of flash waste of plastic products, and further being able to effectively ensure that the plastic products have good appearance quality and dimensional accuracy.

[0007] The purpose of the utility model is achieved through the following technical solutions:

[0008] A split-type mold cavity exhaust structure is used for fixedly installing in the insert hole of the mold core of an injection mold. The split-type mold cavity exhaust structure includes:

[0009] Insert component, including an insert body and an insert pin; the insert body is located within the insert hole, and a plastic molding groove and a positioning hole are jointly formed between the outer sidewall of the insert body and the insert hole. The plastic molding groove communicates with the molding cavity of the mold core; one end of the insert pin passes through the positioning hole to the plastic molding groove of the mold core, and a first exhaust channel and a second exhaust channel are jointly formed between one end of the insert pin, the outer sidewall of the insert body, and the inner wall of the insert hole. One end of the first exhaust channel and one end of the second exhaust channel communicate with the plastic molding groove respectively, and the other end of the first exhaust channel and the other end of the second exhaust channel communicate with the outside of the molding cavity respectively;

[0010] The depth of one end of the first exhaust channel and the depth of one end of the second exhaust channel are both less than the flash value of the plastic raw material injected and filled in the molding cavity.

[0011] In one embodiment, an insert primary exhaust groove and an insert secondary exhaust groove that are sequentially connected are formed on the outer sidewall of the insert body. The depth of the insert primary exhaust groove is less than the flash value of the plastic raw material injected and filled in the molding cavity. The depth of the insert secondary exhaust groove is greater than the depth of the insert primary exhaust groove. The insert primary exhaust groove and the insert secondary exhaust groove jointly form the first exhaust channel with one end of the insert pin;

[0012] A mold core primary exhaust groove and a mold core secondary exhaust groove that are sequentially connected are formed in the insert hole. The depth of the mold core secondary exhaust groove is greater than the depth of the mold core primary exhaust groove. The depth of the mold core primary exhaust groove is less than the flash value of the plastic raw material injected and filled in the molding cavity. The mold core primary exhaust groove and the mold core secondary exhaust groove jointly form the second exhaust channel with one end of the insert pin.

[0013] In one embodiment, the insert body is an integrally formed structure.

[0014] In one embodiment, one end of the insert pin is square-shaped.

[0015] In one embodiment, the other end of the insert pin is fixedly installed on the ejecting mechanism of the injection mold.

[0016] In one embodiment, the insert pin is an integrally formed structure.

[0017] In one embodiment, a sealant position is formed between the end face of one end of the insert pin and the molding surface of the mold core.

[0018] In one embodiment, a hanging platform portion is formed at one end of the insert body facing away from the molding cavity.

[0019] In one embodiment, the insert body is snap-fitted into the insert hole; and / or,

[0020] The hanging platform portion is screwed to the bottom of the mold core, so that the insert body is positioned in the insert hole.

[0021] Compared with the prior art, the present utility model has at least the following advantages:

[0022] 1. The insert-molded cavity exhaust structure is assembled with the insert needle in the insert hole through the insert body, so that multiple exhaust channels can be arranged simultaneously between the insert body and the insert needle and between the insert needle and the mold core, so as to realize efficient exhaust of the molding cavity of a plastic product with a relatively complex structure; the mold cavity exhaust structure has a wide application range and good exhaust effect, which can effectively reduce the generation of flash waste of plastic products, thereby saving the injection consumption of plastic raw materials and making the plastic products after injection molding have good appearance quality and dimensional accuracy.

[0023] 2. One end of the first exhaust channel and one end of the second exhaust channel are respectively communicated with the plastic molding groove, and the plastic raw material in the molding cavity has a depth of both the first exhaust channel and the second exhaust channel less than the flash value of the plastic raw material itself. Therefore, in the injection filling stage of the molding cavity, the molding cavity of the injection mold can simultaneously and efficiently discharge the gas in multiple channels to the outside of the molding cavity. The present utility model improves the gas discharge rate in the molding cavity through multiple exhaust channels, thereby effectively avoiding the problem of air entrapment in the molding cavity in the injection filling stage of the molding cavity, and further effectively reducing the generation of flash waste of plastic products, so that the plastic products after injection molding have good appearance quality and dimensional accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is an exploded view of the structure of the insert-molded cavity exhaust structure in one embodiment;

[0026] Figure 2 For Figure 1 The structural schematic diagram of the mold core of the insert-molded cavity exhaust structure shown;

[0027] Figure 3 For Figure 2 The enlarged structural schematic diagram of part A of the insert-molded cavity exhaust structure shown;

[0028] Figure 4 is Figure 1 the structural schematic diagram of the insert component of the insert-mosaic cavity exhaust structure shown;

[0029] Figure 5 is Figure 4 the enlarged structural schematic diagram at position B of the insert-mosaic cavity exhaust structure shown;

[0030] Figure 6 is Figure 1 the top view of the mold core of the insert-mosaic cavity exhaust structure shown;

[0031] Figure 7 is Figure 6 the sectional view along the cutting line A-A of the insert-mosaic cavity exhaust structure shown;

[0032] Figure 8 is Figure 7 the enlarged schematic diagram at position C of the insert-mosaic cavity exhaust structure shown. Specific embodiments

[0033] For ease of understanding the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided so that the disclosure of the present invention can be understood more thoroughly and comprehensively.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a middle element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only embodiments.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0036] The present disclosure provides an insert - assembled cavity exhaust structure, which is fixedly installed in the insert hole of the mold core of an injection mold. The insert - assembled cavity exhaust structure includes an insert assembly. The insert assembly includes an insert body and an insert pin; the insert body is located in the insert hole, and a plastic molding groove and a positioning hole are jointly formed by the outer side wall of the insert body and the insert hole. The plastic molding groove is communicated with the molding cavity of the mold core; one end of the insert pin penetrates through the positioning hole to the plastic molding groove of the mold core, and a first exhaust channel and a second exhaust channel are jointly formed by one end of the insert pin, the outer side wall of the insert body and the inner wall of the insert hole. One end of the first exhaust channel and one end of the second exhaust channel are respectively communicated with the plastic molding groove, and the other end of the first exhaust channel and the other end of the second exhaust channel are respectively communicated with the outside of the molding cavity;

[0037] The depth of one end of the first exhaust channel and the depth of one end of the second exhaust channel are both smaller than the flash value of the plastic raw material injected and filled in the molding cavity.

[0038] Please refer to Figures 1 to 8 , for a better understanding of the insert - assembled cavity exhaust structure 10 of the present application, the following further explanatory description is made on the insert - assembled cavity exhaust structure 10:

[0039] The insert - assembled cavity exhaust structure 10 in one embodiment includes an insert assembly 200. The insert assembly 200 includes an insert body 210 and an insert pin 220; the insert body 210 is located in the insert hole 101, and a plastic molding groove 201 and a positioning hole 202 are jointly formed by the outer side wall of the insert body 210 and the insert hole 101. The plastic molding groove 201 is communicated with the molding cavity of the mold core 100; one end of the insert pin 220 penetrates through the positioning hole 202 to the plastic molding groove 201 of the mold core 100, and a first exhaust channel 203 and a second exhaust channel 204 are jointly formed by one end of the insert pin 220, the outer side wall of the insert body 210 and the inner wall of the insert hole 101. One end of the first exhaust channel 203 and one end of the second exhaust channel 204 are respectively communicated with the plastic molding groove 201, and the other end of the first exhaust channel 203 and the other end of the second exhaust channel 204 are respectively communicated with the outside of the molding cavity;

[0040] The depth of one end of the first exhaust channel 203 and the depth of one end of the second exhaust channel 204 are both smaller than the flash value of the plastic raw material injected and filled in the molding cavity.

[0041] In this embodiment, the insert - assembled cavity exhaust structure 10 is assembled in the insert hole 101 through the insert body 210 and the insert pin 220. Thus, multiple exhaust channels can be arranged simultaneously between the insert body 210 and the insert pin 220, and between the insert pin 220 and the mold core 100, so as to efficiently exhaust the forming cavity of plastic products with relatively complex structures. This mold cavity exhaust structure has a wide application range and good exhaust effect, which can effectively reduce the generation of flash waste of plastic products, thereby saving the injection consumption of plastic raw materials and making the plastic products after injection molding have good appearance quality and dimensional accuracy.

[0042] Further, one end of the first exhaust channel 203 and one end of the second exhaust channel 204 are respectively communicated with the plastic molding groove 201. Since the depths of the first exhaust channel 203 and the second exhaust channel 204 are both less than the flash value of the plastic raw material itself, during the injection filling stage of the forming cavity, the forming cavity of the injection mold can efficiently discharge the gas in multiple channels to the outside of the forming cavity at the same time. The utility model improves the gas discharge rate in the forming cavity through multiple exhaust channels, thus effectively avoiding the problem of air entrapment in the forming cavity during the injection filling stage, and further effectively reducing the generation of flash waste of plastic products, making the plastic products after injection molding have good appearance quality and dimensional accuracy.

[0043] As Figure 1 、 Figure 4 、 Figure 5 、 Figure 7 and Figure 8 shown, in one embodiment, the outer side wall of the insert body 210 is provided with a sequentially - communicated insert body first - stage exhaust groove 2101 and an insert body second - stage exhaust groove 2102. The depth of the insert body first - stage exhaust groove 2101 is less than the flash value of the plastic raw material injected and filled in the forming cavity. The depth of the insert body second - stage exhaust groove 2102 is greater than the depth of the insert body first - stage exhaust groove 2101. The insert body first - stage exhaust groove 2101 and the insert body second - stage exhaust groove 2102 and one end of the insert pin 220 jointly enclose the first exhaust channel 203;

[0044] In one embodiment, the insert hole 101 is provided with a sequentially - communicated mold core first - stage exhaust groove 102 and a mold core second - stage exhaust groove 103. The depth of the mold core second - stage exhaust groove 103 is greater than the depth of the mold core first - stage exhaust groove 102. The depth of the mold core first - stage exhaust groove 102 is less than the flash value of the plastic raw material injected and filled in the forming cavity. The mold core first - stage exhaust groove 102 and the mold core second - stage exhaust groove 103 and one end of the insert pin 220 jointly enclose the second exhaust channel 204.

[0045] In one of the embodiments, the insert body 210 is an integrally formed structure.

[0046] It should be noted that the flash value of the plastic raw material refers to the gap at which the plastic product will overflow, that is, the value used by those skilled in the art to measure or judge flash or burrs. That is, when the depth of the exhaust groove (the gap of the exhaust passage) is greater than the flash value of the plastic raw material, the burrs generated after the plastic product is cooled and formed will increase. Different plastic raw materials have different flash values. For example, the flash value of common ABS (acrylonitrile-butadiene-styrene copolymer) plastic raw material is 0.04 mm, the flash value of PC (polycarbonate) is 0.06 mm, the flash value of PA (polyamide) is 0.015 mm, and so on.

[0047] It can be understood that in this embodiment, the depth of the first-stage exhaust groove 2101 of the insert and the depth of the first-stage exhaust groove 102 of the mold core are both set to be less than the flash value of the plastic raw material injected and filled in the molding cavity. In this way, the air in the molding cavity can pass through the first-stage exhaust groove 2101 of the insert and the first-stage exhaust groove 102 of the mold core, so that the air can enter the second-stage exhaust groove 2102 of the insert and the second-stage exhaust groove 103 of the mold core, that is, the first exhaust passage 203 and the second exhaust passage 204. The above-mentioned insert-mosaic type mold cavity exhaust structure 10 improves the gas discharge rate in the molding cavity through multiple exhaust passages, thus effectively avoiding the problem of air entrapment in the molding cavity during the injection filling stage.

[0048] Among them, the insert body 210 adopts an integrally formed structural design, which is convenient for processing the exhaust groove and also enables the insert body 210 to have better structural strength support, so as to ensure that the insert body 210 will not deform under the relatively large injection molding pressure in the molding cavity.

[0049] As Figure 1 、 Figure 3 、 Figure 4 、 Figure 7 and Figure 8 shown, in one of the embodiments, one end of the insert pin 220 is square-shaped.

[0050] It can be understood that in this embodiment, one end of the insert pin 220 is square-shaped, so that the insert pin 220 can better fit the outer side wall of the insert body 210 and the inner wall of the insert hole 101.

[0051] Figure 1 shown, in one of the embodiments, the other end of the insert pin 220 is fixedly installed on the ejection mechanism (not shown in the figure) of the injection mold. In one of the embodiments, the insert pin 220 is an integrally formed structure.

[0052] It should be noted that, in this embodiment, the number of the insert pins 220 is three, and correspondingly, the number of the positioning holes 202 is also three. One end of each insert pin 220 and the outer side wall of the insert body 210 and the inner wall of the insert hole 101 together enclose a first exhaust channel 203 and a second exhaust channel 204. It can be understood that, in other embodiments, by analogy, for each additional insert pin 220, a corresponding set of the first exhaust channel 203 and the second exhaust channel 204 can be provided, so that the rate of gas discharge from the molding cavity can be greatly increased, and thus the problem of air entrapment in the molding cavity during the injection filling stage of the molding cavity can be effectively avoided. In this way, the number of flash wastes generated in the plastic product after injection molding can be effectively reduced, and the plastic product has good appearance quality and dimensional accuracy.

[0053] It can be understood that the integrally formed structure of the insert pin 220 effectively increases the structural strength of the insert pin 220, ensuring that the other end of the insert pin 220 can be better fixedly installed on the ejector mechanism (not shown in the figure) of the injection mold.

[0054] As Figures 3 to 5 shown, in one embodiment, a sealant position 2210 is formed between the end face of one end of the insert pin 220 and the molding surface of the mold core 100.

[0055] It can be understood that the reasonable setting of the above-mentioned sealant position 2210 increases the exhaust effect of the split mold cavity exhaust structure 10.

[0056] As Figure 1 and Figure 4 shown, in one embodiment, a hanging platform portion 2110 is formed at one end of the insert body 210 facing away from the molding cavity. In one embodiment, the insert body 210 is snap-fitted into the insert hole 101. In one embodiment, the hanging platform portion 2110 is screwed to the bottom of the mold core 100, so that the insert body 210 is positioned in the insert hole 101.

[0057] It can be understood that the setting of the hanging platform portion 2110 improves the positioning accuracy of the insert body 210 snap-fitted into the insert hole 101. Especially when the insert body 210 is cylindrical, the hanging platform portion 2110 can also play an anti-rotation effect. And the method of screwing the hanging platform portion 2110 to the bottom of the mold core 100 can improve the stability of the insert body 210 snap-fitted into the insert hole 101, and at the same time, it is also convenient for the installation and disassembly of the insert body 210.

[0058] Compared with the prior art, the present utility model has at least the following advantages:

[0059] 1. The insert - assembled cavity exhaust structure is assembled with the insert body and the insert pin in the insert hole, so that multiple exhaust channels can be arranged simultaneously between the insert body and the insert pin and between the insert pin and the mold core, so as to realize efficient exhaust for the forming cavity of plastic products with relatively complex structures. This cavity exhaust structure has a wide application range and good exhaust effect, which can effectively reduce the generation of flash waste of plastic products, thus saving the injection consumption of plastic raw materials and making the plastic products after injection molding have good appearance quality and dimensional accuracy.

[0060] 2. One end of the first exhaust channel and one end of the second exhaust channel are respectively connected to the plastic forming groove. Since the depths of the first exhaust channel and the second exhaust channel are both smaller than the flash value of the plastic raw material itself, during the injection filling stage of the forming cavity, the forming cavity of the injection mold can efficiently discharge the gas in multiple channels to the outside of the forming cavity at the same time. The utility model improves the gas discharge rate in the forming cavity through multiple exhaust channels, thus effectively avoiding the problem of air entrapment in the forming cavity during the injection filling stage, and further effectively reducing the generation of flash waste of plastic products, making the plastic products after injection molding have good appearance quality and dimensional accuracy.

[0061] The above - described embodiments only represent several implementation manners of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A mosaic type cavity exhaust structure is used for being fixedly installed in an insert hole of a mold core of an injection mold, and is characterized in that The inlaid mold cavity exhaust structure comprises: An insert assembly, comprising an insert body and an insert pin; the insert body is located in the insert hole, the outer side wall of the insert body and the insert hole together form a plastic molding groove and a positioning hole, and the plastic molding groove is connected to the molding cavity of the mold core; one end of the insert pin is inserted through the positioning hole to the plastic molding groove of the mold core, and one end of the insert pin, the outer side wall of the insert body and the inner wall of the insert hole respectively form a first exhaust channel and a second exhaust channel, one end of the first exhaust channel and one end of the second exhaust channel are respectively connected to the plastic molding groove, and the other end of the first exhaust channel and the other end of the second exhaust channel are respectively connected to the outside of the molding cavity; The depth of one end of the first exhaust channel and the depth of one end of the second exhaust channel are both smaller than the overflow value of the plastic material injected and filled into the molding cavity.

2. The mosaic cavity exhaust structure according to claim 1, characterized in that The outer side wall of the insert body is provided with an insert primary exhaust groove and an insert secondary exhaust groove which are connected in sequence, the depth of the insert primary exhaust groove is less than the overflow value of the plastic material injected and filled in the molding cavity, the depth of the insert secondary exhaust groove is greater than the depth of the insert primary exhaust groove, and the insert primary exhaust groove and the insert secondary exhaust groove and one end of the insert needle together form the first exhaust channel; The insert hole is provided with a first-level exhaust groove and a second-level exhaust groove of the mold core which are connected in sequence. The depth of the second-level exhaust groove of the mold core is greater than the depth of the first-level exhaust groove of the mold core. The depth of the first-level exhaust groove of the mold core is less than the overflow value of the plastic raw material injected and filled in the molding cavity. The first-level exhaust groove of the mold core and the second-level exhaust groove of the mold core and one end of the insert pin together form the second exhaust channel.

3. The insert-molded cavity exhaust structure according to claim 1, wherein The insert body is an integrally formed structure.

4. The mosaic cavity exhaust structure according to claim 1, wherein, One end of the inlay pin is in a square shape.

5. The mosaic cavity exhaust structure according to claim 1, characterized in that The other end of the insert pin is fixedly mounted on the ejection mechanism of the injection mold.

6. The split cavity exhaust structure according to claim 1, wherein The inlay pin is an integrally formed structure.

7. The mosaic cavity exhaust structure according to claim 1, wherein, The end surface of one end of the insert pin and the molding surface of the mold core form a sealing position.

8. The mosaic cavity exhaust structure according to claim 1, wherein, A hanging platform is formed at one end of the insert body away from the molding cavity.

9. The mosaic cavity exhaust structure according to claim 8, characterized in that, The insert body is snap-fitted into the insert hole; and / or, The hanging platform part is screwed to the bottom of the mold core so that the insert body is positioned in the insert hole.

Images