TW200530013A - Method for injection molding seamless parts and device for same - Google Patents

Abstract

This invention relates to a method for injection molding seamless parts and device thereof, which includes the steps of: a. preparing; b. injection molding; c. extruding; d. cooling to shape; and e. opening the mold units and removing the parts. The device includes: a mold set having a cavity that does not have any projection therein; an extruding device capable of extending into/out of the cavity, to allow an injected material to evenly and steadily flow within the cavity without any obstructions, to form parts without any seams, to allow easy cleansing and maintenance of the mold set and to allow easy cleansing and maintenance of the extruding device.

Description

200530013 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a seamless molding injection molding method and bean device, and more particularly to a seamless molding injection molding method and method that can be applied to micro-injection molding. At the same time, the device has the benefits of more uniform and stable flow of an injection raw material, seamless joining of injection products, easier cleaning and maintenance of a die set, and easy cleaning and maintenance of an extrusion device. [Prior art] The conventional device is shown in Fig. 9 and includes: a mold set 90;

A mold cavity 9 1 formed in the mold group 90; a plurality of models g 2 · protruding from the surface of the mold cavity 9 1 are used as conventional devices. On the other hand, when the material is injected into the material, the left injection is continued. At the same time, the 枓 93 is slowly in the process. At the same time, a conventional device theory is formed. Group 90 ^

The mouth 94 is input into the mold group 90. Qiu Qiu, — A L < 円, the injection raw material 93 series t. The mouth 9 4 flows along the surface of the cavity 9 1, and youfen # μ machine Baya will be the model 9 2 Obstructed} The injection raw material 93 will be separated by the model 92; the main yz knife is divided into two sides (for example, divided into the raw material 93A and the right injection shot material ... ,, the sentence — ^ —cn & M + 枓), Asia The internal flow of the right eight 9 1 flows around the model 92 until ^ 'tel ^ 4- ^ λΙ η ^ and the word /, lL passes the pull type 9 2 a predetermined distance name

Slow: full around the model 92, but I, because: the temperature within the shot = 91 is not kept high for a long time, so in the stream rental, it will slowly present a thicker makeup, and + I The model 92 is generally surrounded by white injection materials 93 on both sides to form a suture 931. When the raw material is molded into a finished product by injection, that is, a straight line that should not be outside, it is inferior to 0% of the weight, and the weight% of the amount of the suture is a defective product.

200530013 V. Description of the invention (2) The internal structure of the finished product may not be solid, especially when applied to micro-injection molding, because the distance between the models is micro-precision, as long as the injection material is slightly viscous, this cannot be fully covered. Between the plural models, it is possible that there are no sutures, but a gap that cannot be seen by the naked eye is directly formed inside the finished product, which is a disadvantage of the conventional device. Therefore, it is necessary to develop new methods and devices to overcome the disadvantages of the conventional devices described above. [Summary of the Invention]

The main object of the present invention is to provide a method and an apparatus for injection molding of a seamless seam, which can injection-mold a seamless seam product. A secondary object of the present invention is to provide a seamless injection molding method and a device thereof, which can reduce the occurrence of defective products, especially when applied to micro injection molding, and can definitely reduce the cost caused by defective products. . Yet another object of the present invention is to provide a method and an apparatus for injection molding of seamless stitching, which make the mold set more convenient, fast and clean during cleaning and maintenance. The technical solution adopted by the present invention to solve the lack of custom is as follows: A seamless injection molding method includes the following steps: a. Preparation step: preparing a mold group having a cavity in the mold group; and There is an extrusion device that can be extended into the cavity; b. Plastic injection step: injection of an injection raw material into the cavity of the mold group; ^ c. Extrusion step: when the injection raw material is still in a plastic state, Use the extrusion device to reach into the cavity of the mold group, and then squeeze and penetrate the shot

Page 7 200530013 V. Description of the invention (3) The raw material is ejected, and the waste generated by penetrating the injected raw material is pushed out of the mold cavity; d. Cooling molding step: After the injection raw material is completely cooled and formed, it is the mold once Group molding and the finished product extruded by the extrusion device; e. Opening the mold and taking out the finished product steps: open the mold group, the finished product can be taken out, and the waste is removed from the extrusion device. A seamless molding injection molding device includes: (a) a mold set provided with: 'a first mold having an inner surface and an outer surface, and communicating with the first mold through a first channel; An inner surface and an outer surface; a second mold corresponding to the first mold, the second mold having an inner surface and an outer surface, and a second channel corresponding to the first channel; The inner surfaces of the two molds correspond to a cavity; (b) an extrusion device, which is provided with: a first extrusion end, which is set in the first channel and can extend into / out of the cavity; The second squeeze end is disposed in the second channel corresponding to the first squeeze end, and the first and second squeeze ends are respectively in the first and second channels, and are synchronously moved in a state of one advance and one retreat. . The above objects and advantages of the present invention can be easily understood from the detailed description and accompanying drawings of selected embodiments described below. The following examples and drawings are used to explain the present invention in detail: [Embodiment] The present invention is a seamless molding injection molding method and device. Please refer to the first to third drawings, the method is as follows Said:

200530013 V. Description of the invention (4) a · Preparation step 1 〇 ·· Prepare a mold set 20 located at a first position P1 and an injection material 30 (conventional materials' will not be repeated), the mold group 20 has A cavity 20A is coated with a layer of a release agent on the surface of the cavity 20A; and an extrusion device 40 is provided on the mold group 20 to extend into the cavity 20A, and the injection raw material 30 is heated to hot melt. State; b · plastic injection step 11: changing the mold group 20 from the first position P1 to a second position P2, and then injecting the raw material 30 in a hot melt state from the inlet 20B of the mold group 20 Injection into the mold located in the second position P2, in the cavity 20A of the group 20 (see the fourth figure for cooperation); c. Extrusion step 12: The injection raw material 30 is still in a slightly hot plasticity condition. At this time, the extrusion device 40 is extended into the cavity 20A of the mold group 20 (refer to FIGS. 5 and 6), and then the injection raw material 30 in the semi-finished state is squeezed and penetrated, and the injection is penetrated. The waste material 31 generated from the raw material 30 pushes out the cavity 20A; d. Cooling forming step 13: wait for the After the injection material 30 is completely cooled and formed, it will become a finished product 30A once the mold group 20 is molded and the extrusion device 40 is extruded; e. Open the mold and remove the finished product. Step 14: Put the mold group 2 The second position P2 is then changed to the first position P1 (please refer to Figures 7 and 8). 'The finished product 30a can be taken out, and the waste material 31 is removed from the pressing device 40 by 0 ^ § However, in this part, it is emphasized that, because the mold cavity 20A is an ordinary, = "headroom state" without any barriers, the injection material 3 〇 is "complete" when it enters the cavity 2 0Α. " Distributed in the cavity 2〇Α, and

200530013 V. Description of the invention (5) When the injection raw material 30 is completely distributed inside the cavity 20A, and the temperature is generally reduced to a slightly hot plasticity state, the extrusion device 40 is extended into the cavity 20A 'and extruded. 3, penetrate the injection raw material 30, so the finished product 30A formed by the extrusion device 40 and the mold cavity 20A hardly produces obvious sutures, that is, the finished product 30A is uniform and uniform as a whole. complete. Please refer to the second to fourth figures again. The device of the present invention includes:

(a) — mold group 20, which in this preferred embodiment has a first position P1 'and a second position P2, the mold group 20 is provided with: a first mold 21 'It has an inner surface and an outer surface, and communicates the inner and outer surfaces of the first mold 21 with a first channel 2 11 (a plurality of preferred embodiments of the present invention); a second mold 22, the It is provided corresponding to the first mold 21, and has an inner surface and an outer surface corresponding to the first mold 21, and a second channel 2 2 1 is provided corresponding to the first channel 2 11 (the better of the present invention The embodiments are a plurality of). The inner surfaces of the first and second molds 21 and 22 correspond to a mold cavity 20A ′, and an inlet 20B communicates with the inner and outer surfaces of the mold group 20 (b). —Inject raw material 30; (c) an extrusion device 40, which is provided with: a first extrusion end 41, which is set in the first channel 2Π, and can extend into / out of the cavity 20A; The second pressing end 42 is located in the second passage 221 corresponding to the first pressing end 41, and the first and second pressing ends 41 and 42 are respectively located there. In the first and second lanes 211 and 221, one way forward one way / one way backward one way

Page 10 200530013 V. Description of the invention (6) Synchronous displacement. What needs to be explained in this section is that, because the first and second extruded ends 41 and 42 are synchronously displaced in a one-in, one-return / one-reverse-in approach, the first extruded end 41 extends into / out of the mold. The action of the hole 2OA can also be performed by the second pressing end 42 instead. In this way, the injection raw material 30 is heated to a hot melt state, and then input into the mold cavity 20 OA from the mold inlet 20 B of the mold group 20, and waits for the injection raw material 30 to cool from high heat to slight heat. When it is in a plastic state, the extrusion device 40 'is activated to drive its first and second extrusion ends 41 and 42 to move forward and backward in the first and second channels 211 and 221, respectively. "Such as, while, and, one by one, the injection is a complete injection method with more models, raw materials, and more.

In this way, the extrusion device 40 is used to squeeze the injection raw material 30, and the squeezed part of the injection raw material 30 is pushed out of the mold cavity 20A by the forward and backward negative extrusion ends 41 and 42. And become waste material 31, in a state where the extrusion device 40 penetrates into the injection raw material 30, the zero raw material 30 is cooled and formed, and finally, the mold group 20 is opened to form a finished product 30A of the i-die hole 30B (see the reference Figure 8). In detail, because the present invention does not provide any protrusions in the cavity, the cavity can be described as "'clearance state". In this way, the injection of high heat into the cavity should allow the injection of raw materials without any model application.

ΐ: 敫 1'li flows in any corner of the mold cavity, 1 solid city fills the positive hole, #squeeze with a squeeze I set the required wheel, even if it is.

Device molding. And live 扪 生 J its ’for the micro model of conventional micro-injection molding, it is easy to cause it

200530013 V. Description of the invention (7) The flow of raw materials is not easy, and the lack of defective products can be effectively and thoroughly improved. After the conventional device is improved by the present invention, [1] the finished product is seamlessly connected, and there is no sudden state in the design cavity of the product. In this way, even if the material of the injection material is different, or the phenomenon of 'moving by the high temperature and cooling speed' in the temperature process, it will also be due to the flow speed of the cavity in the cavity, especially because the protruding model blocks the flow, which relatively improves the quality. To reduce the advantages of invention due to defects. The advantages are as follows: Improved quality and reduced defects. The model produced by the present invention, that is, the entire mold cavity exhibits various factors such as the long distance of the transfer process and the low injection rate, but the faster transfer rate, so the headspace design of the viscous and unfavorable flow, and the improvement of the injection rate. The relatively viscous injection materials will not cause cost waste caused by suture defects that reduce the quality of the finished product.

[2] The chess hole is the surface that is clear in the mold hole, that is, because there is no way and potential of the hair, but the whole spirit of the Ming is filled with an empty state, so the clear setting of the fast mold hole can be used. The examples and scopes mentioned are not cleaned and maintained at any speed, and the recesses are blocked. The reason is that the finished product is shot only by any bending tool made, and for all the original sutures are also shot. A better and simpler repair of the mold of the present invention, or a dead corner can be said to be only an extrusion device. It is as easy to flow and more uniform. It is well-maintained and more stable, which explains that the present invention will not depart from this artist. The present invention is described by the above detailed description.

200530013 V. Description of Invention (8) The above purpose is indeed achieved, and it has already complied with the provisions of the Patent Law. «LiBi Page 13 200530013 Brief description of the drawings The first diagram is the second diagram of the invention The third diagram is the fourth diagram of the invention The fourth diagram is the fifth diagram of the invention The sixth diagram of the invention is the seventh diagram of the invention The eighth drawing of the present invention is the ninth drawing of the present invention. The preparation step of the conventional package 1 〇 Extrusion step 1 2 Open the mold and take out the finished mold cavity 20A First mold 21 Second mold 22 Injection raw material 30 Mold hole 30B Extrusion device 40 No. Two extrusion ends 42 Mold cavity 91 Injection raw material 93 Right injection raw material 93B Feeding port 9 4 The process of the second position P2 is applied to the application. The application is applied to the finished product. Step 14 The combination of the preparation steps Schematic diagram of the pre-mold preparation step, the plastic injection step, the extrusion step, the cooling molding step, the mold opening and removal of the finished product, the mold ejection view, the cross-section view, the plastic injection step, and the cooling molding step. 20 Inlet 2 0 B First channel 211 Second channel 221 Finished product 3 0 A Scrap 31 First squeeze end 41 Die set 90 Model 92 Left injection raw material 93A Suture thread 931 First Set P1

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Claims (1)

200530013 VI. Scope of patent application L. A seamless injection molding method includes the following steps: a. Preparation step: prepare a mold set with a cavity in the mold set, and a mold set is provided on the mold set. Extrusion device for mold cavity b. Plastic injection step. Injection of an injection raw material into the cavity of the mold group; 'c. Extrusion step: when the injection material is still in a plastic state, use the extrusion device to extend Into the cavity of the mold group, and then press and penetrate the injection raw material 'and push the waste generated by penetrating the injection raw material out of the cavity; d · Cooling molding step: After the injection raw material is completely cooled and formed, that is, After the mold group is shaped and the extrusion device is extruded, the mouth is opened, and the mold is opened and the finished product is removed. Steps: Open the mold group, the finished product can be taken out, and the waste is extruded from the extrusion. Remove from the device. 2. The seamless molding injection molding method and device described in item 1 of the scope of the patent application, wherein the mold set is used to open / close the mold between a first position and a second position. 3. The seamless molding injection molding method and device described in item 1 of the scope of the patent application, wherein a surface of the cavity is coated with a layer of a release agent. 4 · A seamless injection molding device comprising: (a) a mold set provided with: a first mold having an inner surface and an outer surface, and communicating with the first through a first channel; Inner and outer surfaces of the mold; 200530013 6. The scope of the application for a patent A second mold is provided corresponding to the first mold. The second mold has an inner surface and an outer surface, and a second channel corresponding to the first channel. The inner surfaces of the two molds correspond to a cavity; (b) an extrusion device provided with: a first extrusion end, which is set in the first channel and can extend into / out of the cavity;- A second squeeze end is disposed in the second channel corresponding to the first squeeze end, and the first and second broadcast pressure ends are respectively in the first and second channels, synchronized in a state of one advance and one retreat. Displacement. jp 5 The seamless molding injection molding method and device described in item 4 of the scope of patent application, wherein the mold set has a first position and a second position. 6. The seamless molding injection molding method and device described in item 4 of the scope of the patent application, wherein the first and second channels are plural. 7 · The seamless molding injection molding method and device described in item 4 of the scope of the patent application, wherein the first and second extruded ends can be extended into / out of the cavity. 8 · The method and device for injection molding of seamless stitching as described in item 4 of the scope of patent application, wherein the first and second extrusion ends are in the first and second channels, respectively, with one advance, one retreat, and one retreat. The state of advancement is synchronized. 9. The seamless molding injection molding method and device described in item 4 of the scope of the patent application, wherein the mold cavity is used for inputting an injection raw material. Page 16