JP2020514121A - Die having cutting push pin and method of manufacturing product using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold having a cutting push pin capable of contributing to an increase in productivity and a reduction in production cost by reducing a production process, and a product manufacturing method using the same. A cavity is provided between a first mold and a second mold, a gate is provided at an inlet of the cavity, and a gate piece having a through hole is located in the gate in the second mold. A cutting push pin is attached between the gate piece and the cavity so as to reciprocate in a direction intersecting with the cavity by a driving unit in a state of being located on a side portion of the gate. , Cutting and removing the product molded by the cavity from the runner scrub. [Selection diagram]

Description

  The present invention relates to a mold having a cutting push pin and a method of manufacturing a product using the same, and more particularly, to reduce a production process by simultaneously cutting and taking out a product by a cutting push pin attached to a tunnel gate. The present invention relates to a mold having a cutting push pin that contributes to increased productivity and reduced production cost, thereby improving the competitiveness of a company, and a product manufacturing method using the same.

  Generally, a synthetic resin material is formed and manufactured using a metal mold in order to form a product having a complicated shape and a high degree of completeness by using the plasticity and fluidity of the material.

  Such products include a wide variety of structures including diffuser lenses. As a technique related to a conventional mold related to this, there is a case where "a mold for injection of an aspherical plastic lens" of Patent Document 1 is presented. This is to form a circular upper core and a circular lower core in order to form a spherical portion having different curvatures on the upper and lower surfaces of the aspherical plastic lens and a disc-shaped flange portion on the outer peripheral surface of the spherical portion. An injection mold capable of injecting a resin between and ejecting a lens, wherein the upper core fixed in the upper mold and the lower core are arranged so as to face the upper core, A lower core fixed in the lower mold; an injection port arranged in parallel with the lower core to inject the resin; and a runner driven by a first push pin; For ejecting a completed injection-molded product between the upper core and the lower core, which is arranged in parallel with the core, is positioned in a direction facing the runner, and comprises an overflow driven by a second push pin. In addition, at the same time, the runner and the overflow ascend above the lower core by driving the first push pin and the second push pin to push up the injection molded product so that the injection molded product can be easily taken out from the lower core.

  However, such a conventional technique requires a large amount of time and effort for cutting because it requires a separate cutting process, either manually or automatically, in order to separate the product from the runner scrap. It is difficult to improve, and it is expensive to manufacture, replace and correct the cutter, and not only has a limit to improve the cutting quality, but also a problem to provide a cause to increase the defective rate.

  In addition, in the conventional technology, when the product is a lens, the specs of good products are more complicated than general products in terms of the appearance of the product except for the optical performance due to the characteristics of the product, especially the length of the gate and the shape of the cut surface. However, there is a problem that defects are generated due to the presence or absence of cracks regardless of the optical performance of the product, and not only the productivity but also the loss cost is high.

Korean Patent Publication No. 10-2009-0075042

  In order to solve the above-mentioned problems of the prior art, the present invention simultaneously cuts and takes out products by a cutting push pin attached to a tunnel gate, thereby reducing the production process and increasing the productivity and reducing the production cost. This improves the competitiveness of the company, and when the product performance, for example, the product is a lens, the appearance defect rate other than the optical performance is significantly reduced to increase the productivity and reduce the loss cost, and a separate cutter. By omitting the cutting process that uses, the cost of consumables such as a cutter is greatly reduced, the cost burden of replacing, manufacturing and modifying the cutter is reduced, and by omitting a separate cutting process Since there is no restriction on the direction of the cutter in securing the mold cavity, the restriction on the increase in the number of cavities is eliminated and the number of cavities can be easily expanded.By equipping the tunnel gate with a gate piece, it can be maintained and maintained. By reducing the cost and effort required for management and installing a cutting push pin at the bottom of the tunnel gate, the cutting safety is as good as that of existing thermal cutting, and the shape of the gate cut part of the product, for example, a lens, can be made uniform. The purpose is to maintain a constant length, satisfy a constant length, improve productivity, and reduce the defective rate.

  According to an aspect of the present invention, a cavity is provided between a first mold and a second mold, a gate is provided at an inlet of the cavity, and the second mold is provided. A gate piece having a through hole so as to be located in the gate, and is reciprocally transferred in a direction intersecting with the cavity by a driving unit while being located on a side portion of the gate between the gate piece and the cavity. A cutting push pin is attached to the cutting die and the product formed by the cavity is cut and taken out from the runner scrub by the transfer of the cutting push pin, and the cutting push pin is the second die corresponding to the lower die. In, there is provided a mold having a cutting push pin slidably mounted in parallel surface contact with the gate piece mounted vertically to the bottom surface of the gate.

  According to another aspect of the present invention, there is provided a method of manufacturing a product using a mold having a cutting push pin according to one aspect of the present invention, wherein the cavity is formed with the first and second molds closed. Injecting molten resin into the cavity, and if the molten resin in the cavity hardens, the cavity is opened by moving one or both of the first and second molds, and the cavity is opened. Then, by moving the cutting push pin by the driving unit so as to intersect with the cavity, the product formed by the cavity is separated from the runner scrap, cut, and taken out. A method of manufacturing a diffuser lens using a mold having a pin is provided.

  The product may be a diffusing lens.

  According to the mold having the cutting push pin and the product manufacturing method using the same according to the present invention, the cutting push pin attached to the tunnel gate simultaneously cuts and takes out the product, thereby reducing the production process and producing the product. This can contribute to increased productivity and reduced production costs, which can improve the competitiveness of the company. Product performance, for example, when the product is a lens, significantly lowers the appearance defect rate other than optical performance and improves productivity. The cost of consumables such as a cutter can be significantly reduced by eliminating the cutting process using a separate cutter, and the cost burden of replacement, production and modification of the cutter can be reduced. It is possible to reduce the number of cavities, and by eliminating a separate cutting step, there is no restriction on the cutter direction in securing the cavities for mass production molds, so the restriction on the increase in the number of cavities is removed and the number of cavities can be easily expanded. If the tunnel gate is equipped with a gate piece, the cost and effort not only for its production but also for maintenance and management can be reduced, and the length of the gate is a product approval standard such as a lens mold. The accuracy of the gate length can be easily maintained, and by attaching the cutting push pin to the bottom of the tunnel gate, the cutting safety is as good as the existing thermal cutting and the gate cutting of the product, for example, the lens It is possible to maintain a constant shape of the part and satisfy a constant length to improve productivity and reduce the defective rate.

1 is a perspective view showing a mold having a cutting push pin according to an embodiment of the present invention. FIG. 6 is a bottom perspective view of an upper die of a die having a cutting push pin according to an embodiment of the present invention. FIG. 6 is a perspective view showing a lower mold of a mold having a cutting push pin according to an embodiment of the present invention. 3A and 3B are a plan view and a side sectional view showing an example of a gate and a cutting push pin in a mold having a cutting push pin according to an embodiment of the present invention. FIG. 6 is a plan view and a side sectional view showing another example of a gate and a cutting push pin in a mold having a cutting push pin according to an embodiment of the present invention. 6A and 6B are a plan view and a side sectional view showing still another example of a gate and a cutting push pin in a mold having a cutting push pin according to an embodiment of the present invention. FIG. 3 is a side view and a front view showing an example of a gate piece in a mold having a cutting push pin according to an embodiment of the present invention. It is a front view showing another example of the gate piece in the metal mold which has the cutting push pin by one example of the present invention. It is a front view showing another example of the gate piece in the metallic mold which has a cutting push pin by one example of the present invention. FIG. 6 is a side sectional view for sequentially explaining a method of manufacturing a product using a mold having a cutting push pin according to an embodiment of the present invention. FIG. 6 is a side sectional view for sequentially explaining a method of manufacturing a product using a mold having a cutting push pin according to an embodiment of the present invention. FIG. 6 is a side sectional view for sequentially explaining a method of manufacturing a product using a mold having a cutting push pin according to an embodiment of the present invention.

  Since the present invention may have various embodiments with various modifications, specific embodiments will be shown and described in the drawings as examples. Further, the present invention is not limited to such specific embodiments and should be understood to include all modifications, equivalents or alternatives included in the technical idea of the present invention.

  1 is a perspective view showing a mold having a cutting push pin according to an embodiment of the present invention, FIG. 2 is a bottom perspective view of an upper mold in a mold having a cutting push pin according to an embodiment of the present invention, FIG. FIG. 4 is a perspective view showing a lower mold of a mold having a cutting push pin according to an embodiment of the present invention.

  Referring to FIGS. 1 to 3, a mold 100 having a cutting push pin according to an embodiment of the present invention includes cavities 111 and 121 between first and second molds 110 and 120. , 121 are provided at the entrances of the gates 121, 121, and a gate piece 127 having a through hole 127a so as to be located inside the gate 126 in the second mold 120 is provided, and between the gate piece 127 and the cavities 111, 121. The cutting push pin 130 is attached by the driving unit so as to reciprocate in the direction intersecting with the cavities 111 and 121 while being positioned on the side of the gates 116 and 126. The product 1 to be molded (shown in FIGS. 11 and 12) is cut and taken out from the runner scrap 2 (shown in FIGS. 11 and 12).

  On the other hand, a mold having a cutting push pin and a product manufacturing method using the same according to an embodiment of the present invention will be described by taking a diffusion lens as an example of the product, but the present invention is not necessarily limited to this, and injection of a molten resin is not required. Also, it can be applied to various products manufactured by molding by curing. Here, the diffusing lens may be a refraction type as an example, and may be a reflection type as another example.

  The first mold 110 may be, for example, an upper mold, in which a cavity 111 is formed on a surface facing downward, and the upper core 112 in which the cavity 111 is formed and the upper core 112 are stacked and fixed on the upper core 112. The upper support plate 113 may be fixed to the lower surface of the upper base 150. The first mold 110 is formed with a sprue 114 that provides a passage for the molten resin discharged from a nozzle attached to the first mold 110, and is connected to the sprue 114 to melt the sprue 114 into the cavity 111. A runner 115 that provides a resin transmission path is formed on the bottom surface, and a gate 116 that serves as an inlet of the cavity 111 is formed on the bottom surface of the runner 115 at the end of the runner 115. The runner 115 and the gate 116 may be formed on the lower surface of the upper core 112. The cavities 111 can be formed in a large number as in the present embodiment.

  The second mold 120 may be, for example, a lower mold, and a cavity 121 is formed on a surface facing upward, and a lower core 122 in which the cavity 121 is formed and a lower part fixed below the lower core 122. The lower support plate 123 may be fixed to the upper surface of the lower base 260. The second mold 120 is connected to the sprue 114 of the first mold 110 to form a runner 125 on the bottom surface that provides a molten resin transmission passage from the sprue 114 to the cavity 121. A gate 126, which is an end point and serves as an inlet of the cavity 121, is formed on the bottom surface. The runner 125 and the gate 126 may be formed on the upper surface of the lower core 122. The lower core 122 may have a runner 125, a gate 126, and a cavity 121 formed so as to correspond to the runner 115, the gate 116, and the cavity 111 of the upper core 112, respectively.

  The upper base 150 and the lower base 160 may be fixedly or vertically mounted to the frame of the mold apparatus, and either one or both of them may be vertically mounted by a driving device, and are coupled to opposite sides. Each of the first and second guides 151 and 161 that are detachably coupled to each other to guide the position may be formed in a plurality. Here, the driving device may be a device that converts the rotational force of the motor into a linear motion, or may be a cylinder that operates by pneumatic pressure, hydraulic pressure, or the like.

  Referring to FIG. 3 and FIG. 4, the cutting push pin 130 can be cut by stress concentration on the molten resin molding supported by the through hole 127a, and can be manufactured from special steel. Cutting cracks can be minimized even in the case of PMMA resin, which has a high defect rate even by general thermal cutting. Meanwhile, as in the present embodiment, a plurality of gates 126 may be formed to correspond to each of the cavities 121 that are provided around the runner 125. When the number of the gate pieces 127 or the cavities 121 is large, the cutting push pins 130 may have a number corresponding to the number of the gate pieces 127 or the cavities 121, and may be connected to each other by the elevating block 140. The lifting block 140 is reciprocally moved by a driving unit (not shown). The drive unit may be a device that converts the rotational force of the motor into a linear motion, or may be a cylinder that is driven by hydraulic pressure or pneumatic pressure.

  The cutting push pin 130 may be formed with a horizontal horizontal tip 131 at the end located at the gate 126, and the horizontal tip 131 may be used to cut a wide area with respect to the cutting portion. In addition, the cutting push pin 130 comes into surface contact in parallel with the gate pieces 127 that are vertically attached to the bottom surfaces of the gates 126 in the second die 120 corresponding to the lower die, and as in the present embodiment, the through holes 127a. Can be slidably mounted orthogonally to, which is equally applicable to all embodiments.

  Referring to FIG. 5, as another example, the cutting push pin 230 has a first acute-angled tip 231 formed at a portion of the gate 126, the first acute-angled tip 231 protruding toward the cavity 121 at an acute angle. The cutting efficiency can be improved by the inclined structure of the first acute angle tip 231.

  Referring to FIG. 6, as another example, the cutting push pin 330 may have a second acute-angled tip 331 formed at an end located at the gate 126 and projecting at an acute angle toward a side toward the cavity 121. The cutting efficiency can be improved by the inclined structure of the second acute angle tip 331.

  Referring to FIGS. 3, 4 and 7, the gate piece 127 may be made of, for example, alloy steel, and has a through hole 127 a at the bottom surface of the gate 126 in the second mold 120 corresponding to the lower mold. It can be mounted vertically so that it is exposed. Here, the through hole 127a may be installed in the gates 116 and 126 so as to communicate with the gates 116 and 126 of the first and second molds 110 and 120. Further, the gate 126 may be formed so as to be orthogonal to the gate piece 127 as in this embodiment.

  Referring to FIG. 8, as another example, the gate piece 237 may have a circular cross section of the through hole 237a.

  Referring to FIG. 9, as still another example, the gate piece 337 may be formed such that the through holes 337a having semicircles at both ends extend in the width direction so as to resemble an elliptical shape.

  10 to 12 are side cross-sectional views for sequentially explaining a method of manufacturing a product using a mold having a cutting push pin according to an embodiment of the present invention, using a mold having a cutting push pin according to the present invention. A method for forming and manufacturing a product will be described, which will be described based on a mold 100 having a cutting push pin according to an embodiment of the present invention. Here, the product may be, for example, a diffusing lens as described above, but the product is not necessarily limited to this, and is applicable to all products that can be manufactured from a synthetic resin.

  Referring to FIG. 10, a method of manufacturing a product using a mold having a cutting push pin according to an exemplary embodiment of the present invention first includes cavities 111 and 121 with the first and second molds 110 and 120 closed. Inject the molten resin into. When such a molten resin is injected from a nozzle (not shown) through the sprue 114, it is dispersed by the runner 115 into each of the gates 116 and 126 to fill the cavities 111 and 121. At this time, the molten resin passes through the through hole 127a when passing through the gates 116 and 126.

  Referring to FIG. 11, if the molten resin in the cavities 111 and 121 is cured after the cavities 111 and 121 are filled with the molten resin, one of the first and second molds 110 and 120 is driven by the driving unit. Alternatively, the cavities 111 and 121 are opened by the movement of both.

  Referring to FIG. 12, when the cavities 111 and 121 are opened, the driving unit moves the cutting push pin 130 so as to intersect the cavities 111 and 121, so that the product 1 molded by the cavities 111 and 121 is formed. It is separated from the runner scrap 2 and cut, and taken out from the cavities 111 and 121.

  According to the die having the cutting push pin and the method of manufacturing a product using the same according to the present invention, the cutting push pin attached to the tunnel gate simultaneously cuts and takes out the product, thereby improving the production process. This can contribute to increased productivity and reduced production costs, which can improve the competitiveness of the enterprise.

  Further, according to the present invention, when the performance of the product, for example, the product is a lens, the appearance defect rate other than the optical performance is remarkably reduced to increase the productivity and the loss cost can be reduced. By omitting the steps, the cost of consumables such as a cutter can be significantly reduced, and the cost burden of replacing, manufacturing and modifying the cutter can be reduced.

  Further, according to the present invention, by omitting a separate cutting step, there is no restriction on the cutter direction in securing the cavities of the mass-production mold, so that the limitation on the increase in the number of cavities is eliminated and the number of cavities can be easily expanded. By providing the tunnel gate with the gate piece, it is possible to reduce the cost and the effort for not only the fabrication but also the maintenance and management.

  Further, according to the present invention, the accuracy of the gate length can be easily maintained when the length of the gate is a product approval standard as in the lens mold.

  Further, according to the present invention, a cutting push pin is attached to the bottom of the tunnel gate to provide cutting safety comparable to that of existing thermal cutting, and to form a uniform shape of a gate cut portion of a product, for example, a lens. It is possible to maintain and satisfy a constant length to reduce productivity and defective rate.

  Although the present invention has been described above with reference to the accompanying drawings, various modifications can be made without departing from the technical idea of the present invention. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by the claims and their equivalents.

Claims (6)

A cavity is provided between first and second molds for molding a diffusion lens, a gate is provided at an inlet of the cavity, and a gate having a through hole is located in the gate in the second mold. A piece is provided, and a cutting push pin is attached so as to reciprocate in a direction intersecting with the cavity by a driving part while being located on a side portion of the gate between the gate piece and the cavity; By cutting and removing the product molded by the cavity from the runner scrub,
A large number of the gates are formed to correspond to each of the plurality of cavities provided around the runner,
The cutting pushpin is slidable so as to be in surface contact with the gate pieces, which are vertically attached to respective bottom surfaces of the gates in the second die corresponding to the lower die, in parallel with each other and to be orthogonal to the through hole. Many are connected to each other by an elevating block mounted and reciprocated by the driving unit,
The gate pieces are vertically attached so that the through holes are exposed at respective bottom surfaces of the gates formed so as to be orthogonal to each other in the second mold corresponding to the lower mold.
A mold having a cutting push pin for molding a diffusion lens, which is characterized in that: The cutting push pin is
Forming a horizontal horizontal tip at an end located at the gate;
A mold having a cutting push pin for molding the diffusion lens according to claim 1. The cutting push pin is
A first acute-angled tip is formed on a part of the end, the first acute-angled tip protruding to form an acute angle toward the cavity at the end located at the gate.
A mold having a cutting push pin for molding the diffusion lens according to claim 1. The cutting push pin is
A second acute-angled tip is formed on the entire end of the gate, the second acute-angled tip protruding at an acute angle toward the side facing the cavity.
A mold having a cutting push pin for molding the diffusion lens according to claim 1. The gate piece is
The through hole having semicircular shapes at both ends is formed to extend in the width direction,
A mold having a cutting push pin for molding the diffusion lens according to claim 1. A method of manufacturing a diffusion lens using a mold having a cutting push pin according to claim 1,
Injecting a molten resin into the cavity with the first and second molds closed,
When the molten resin in the cavity is cured, the cavity is opened by moving one or both of the first and second molds;
When the cavity is opened, the driving pusher moves the cutting push pin so as to intersect with the cavity, thereby separating the diffusion lens formed by the cavity from the runner scrap, cutting it, and taking it out. ,
A method of manufacturing a diffusion lens using a mold having a cutting push pin, comprising:

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