WO2019182220A1

WO2019182220A1 - Mold having cutting ejector pin and method for producing product using same

Info

Publication number: WO2019182220A1
Application number: PCT/KR2018/012634
Authority: WO
Inventors: 장해산; 서진석
Original assignee: 장해산
Priority date: 2018-03-20
Filing date: 2018-10-24
Publication date: 2019-09-26
Also published as: KR101902327B1; TW201940304A; JP2020514121A

Abstract

The present invention relates to a mold having a cutting ejector pin and a method for producing a product using same. The mold having a cutting ejector pin comprises: a cavity formed between a first mold and a second mold; a gate provided at an inlet of the cavity; a gate piece having a through hole so as to be positioned inside the gate of the second mold; and a cutting ejector pin reciprocating by means of a driving unit in a direction intersecting the cavity while being positioned at a side of the gate between the gate piece and the cavity. Due to these features, a product molded by the cavity can be simultaneously cut from the runner scrap and taken out by the transfer of the cutting ejector pin. According to the present invention, since the cutting and the removal of a product are performed simultaneously by means of the cutting ejector pin installed at a tunnel gate, production processes are reduced, and as a result, productivity can be increased and production costs can be reduced, such that the competitiveness of a company may improve. Furthermore, with respect to the performance of a product, for example a lens, other than the optical performance, the exterior appearance defect rate can be remarkably reduced, thereby increasing productivity and reducing cost loss. As a cutting process in which a separate cutter is used is omitted, costs for replacement parts, such as a cutter, can be significantly reduced, thereby reducing the costs incurred for replacement, manufacturing, and modification of the cutter. Due to the omission of a separate cutting process, the restriction on the direction of the cutter in forming cavities in a mass-production mold is removed, such that the limitation on the increase in the number of cavities is removed, whereby the number of cavities can easily be increased.

Description

Mold with cutting mill pin and product manufacturing method using the same

The present invention relates to a mold having a cutting mill pin and a product manufacturing method using the same, and more particularly, by cutting and taking out a product simultaneously by cutting mill pins installed in tunnel gates, thereby reducing productivity and increasing productivity. The present invention relates to a mold having a cutting mill pin and a product manufacturing method using the same, which contribute to cost reduction and thereby improve the competitiveness of a company.

In general, a product of a synthetic resin material is molded and manufactured using a metallic mold in order to be molded to have a high degree of completeness having a complicated shape by using plasticity and fluidity of the material.

Such a product includes various structures including a diffusion lens, and as a technology related to a conventional mold, a "molding mold for aspherical plastic lens" of Korean Patent Publication No. 10-2009-0075042 has been presented, which is an aspheric plastic. Injection to inject a lens by injecting resin between a circular upper core and a circular lower core to form a disc shaped flange portion at the spherical portion having different curvatures of the upper and lower surfaces of the lens and the outer peripheral surface of the spherical portion. A mold for molding, comprising: the upper core fixed in an upper mold; The lower core disposed below to face the upper core and fixed in the lower mold; A runner arranged parallel to the lower core and having an injection hole for injecting the resin and driven by a first mill pin; An overflow arranged in parallel with the lower core and positioned in a direction facing the runner and driven by a second milling pin; simultaneously to take out the finished injection-molded product between the upper core and the lower core. The runner and the overflow rise above the lower core by the driving of the first and second mill pins, thereby easily lifting the injection molded article from the lower core.

However, such a conventional technique requires a separate cutting process manually or automatically in order to separate the product from the runner scrap, which takes a lot of time and effort for cutting, which leads to difficulty in improving productivity, It is expensive to manufacture, replace, and modify, and not only has a limitation in improving cutting quality, but also has a problem of providing a cause of increasing a defective rate.

In addition, when the product is a lens, the product specification is more difficult than the general product in terms of the appearance of the product, except for the optical performance, in particular, the length of the gate, the shape of the cut surface, the presence of cracks, There was a problem in that defects occur separately from the light performance of the product due to no light, productivity, as well as a lot of loss costs.

In order to solve the above problems of the prior art, the present invention by cutting and taking out the product at the same time by the cutting mill pin installed in the tunnel gate, thereby reducing the production process contributes to increased productivity and reduced production costs, This improves the company's competitiveness and, in the case of a lens, significantly reduces the appearance defect rate other than the light performance, thereby increasing productivity and loss cost, and omitting the cutting process using a separate cutter. Significantly reduce costs, reducing the cost of replacing, fabricating, and modifying cutters, and eliminating the need for cutter direction in securing cavity for mass production molds as a separate cutting process is omitted, limiting the increase in the number of cavities By eliminating this, the number of cavities can be easily expanded, and the gate piece is provided in the tunnel gate. As a result, it is possible to reduce the cost and effort required for not only its manufacture, but also for maintenance and management, and the cutting mill pin is installed at the bottom of the tunnel gate, thereby providing cutting stability that is inferior to conventional heat cutting, and for example, a product such as a lens. The purpose is to reduce the productivity and the defective rate by maintaining a constant shape of the gate cut portion and satisfying a certain length.

In order to solve the above problems, according to an aspect of the present invention, a cavity is provided between the first and the second mold, a gate is provided at the inlet of the cavity, and located in the gate in the second mold A gate piece having a through hole is provided, and a cutting mill pin is installed to reciprocate in a direction intersecting the cavity by a driving unit in a state located between the gate piece and the cavity at the side of the gate. By cutting the product formed by the cavity from the runner scrap and is taken out, the cutting mill pin, in the second piece corresponding to the lower mold in the gate piece which is installed perpendicular to the bottom surface of the gate A mold having a cutting mill pin is installed so as to be in side contact and slidable side by side. Ball.

According to another aspect of the present invention, in the method for manufacturing a product using a mold having a cutting mill pin according to an aspect of the present invention, in the state in which the first and second molds are closed, injecting molten resin into the cavity Making; When the molten resin in the cavity is cured, allowing the cavity to open by movement of either or both of the first and second molds; And when the cavity is opened, moving the cutting mill pin to cross the cavity by the driving unit so that a product formed by the cavity is separated from the runner scrap and cut out simultaneously with the cutting mill pin. Eggplant is provided a product manufacturing method using a mold.

The product may be a diffusion lens.

According to the mold having a cutting mill pin and the product manufacturing method using the same according to the present invention, by cutting and taking out the product at the same time by the cutting mill pin installed in the tunnel gate, it is possible to reduce the production process to increase productivity and reduce production costs This can improve the competitiveness of the enterprise, and if the product performance, for example, the lens is a lens, the appearance defect rate other than the optical performance is significantly lowered, thereby increasing productivity and reducing the loss cost, cutting process using a separate cutter This omission reduces the cost of consumables such as cutters, thereby reducing the cost of replacing, fabricating, and modifying the cutters, and by eliminating a separate cutting process, restrictions in cutter direction in securing the cavity of mass production molds are eliminated. By eliminating the restriction on increasing the number of cavities, the expansion of the number of cavities The gate piece is provided in the tunnel gate, so that the cost and effort for not only its production but also maintenance and management can be reduced, and when the length of the gate is within the approval criteria of the product, such as a lens mold, It is easy to maintain the precision of the length, the cutting mill pin is installed on the bottom of the tunnel gate, it has a cutting stability that is inferior to the existing heat cutting, and also maintains a constant shape of the product, such as the gate cut portion of the lens In addition, it can reduce productivity and defective rate by satisfying a certain length.

1 is a perspective view showing a mold having a cutting mill pin according to an embodiment of the present invention.

Figure 2 is a bottom perspective view of the upper mold in a mold having a cutting mill pin according to an embodiment of the present invention.

Figure 3 is a perspective view showing a lower mold in a mold having a cutting mill pin according to an embodiment of the present invention.

4 is a plan view and a side cross-sectional view showing an example of a gate and a cutting mill pin in a mold having a cutting mill pin according to an embodiment of the present invention.

5 is a plan view and a side cross-sectional view showing another example of a gate and a cutting mill pin in a mold having a cutting mill pin according to an embodiment of the present invention.

Figure 6 is a plan view and side cross-sectional view showing another example of the gate and the cutting mill pin in a mold having a cutting mill pin according to an embodiment of the present invention.

7 is a side view and a front view showing an example of a gate piece in a mold having a cutting mill pin according to an embodiment of the present invention.

8 is a front view showing another example of a gate piece in a mold having a cutting mill pin according to an embodiment of the present invention.

9 is a front view showing another example of a gate piece in a mold having a cutting mill pin according to an embodiment of the present invention.

10 to 12 are side cross-sectional views for sequentially explaining a product manufacturing method using a mold having a cutting mill pin according to an embodiment of the present invention.

Since the present invention may have various embodiments by various changes, specific embodiments will be described by way of example in the drawings. In addition, it is to be understood that the present invention is not limited to these specific embodiments, but includes all modifications, equivalents, and substitutes included in the technical idea of the present invention.

1 is a perspective view showing a mold having a cutting mill pin according to an embodiment of the present invention, Figure 2 is a bottom perspective view of an upper mold in a mold having a cutting mill pin according to an embodiment of the present invention, Figure 3 A perspective view showing a lower mold in a mold having a cutting mill pin according to an embodiment of the present invention.

1 to 3, in the mold 100 having the cutting mill pin according to an embodiment of the present invention, the

cavity

111, 121 is provided between the first and

second mold

110, 120, and the

cavity

111, 121. Gates 116 and 126 are provided at the entrance of the gate, and a gate piece 127 having a passage hole 127a is provided in the second mold 120 to be located in the gate 126, and the gate piece 127 and the

cavity

111 and 121 are provided. Cutting mill pins 130 are installed to reciprocate in the direction crossing the

cavity

111, 121 by the drive unit in the state located on the side of the gate (116, 126) between), the cavity (111, 121) by the transfer of the cutting mill pin 130 The product 1 (shown in FIGS. 11 and 12) formed by the cutting is allowed to be cut out from the runner scrap 2 (shown in FIGS. 11 and 12) and taken out.

On the other hand, a mold having a cutting mill pin and a product manufacturing method using the same according to an embodiment of the present invention, as a product, will be described by taking a diffusion lens as an example, but need not be limited to this, injection and curing of the molten resin Various products produced by molding due to can be applied. The diffusion lens may be, for example, a refractive type, and may be a reflective type as another example.

As an example, the first mold 110 may be an upper mold, and a cavity 111 is formed on a surface facing downward, and an upper core 112 on which the cavity 111 is formed and an upper portion stacked and fixed thereon. It may include a support plate 113, 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 through which the molten resin discharged from the nozzle disposed at the upper portion passes, and is connected to the sprue 114 to thereby form a cavity (from the sprue 114). A runner 115 that provides a delivery passage of the molten resin to the 111 is formed at the bottom, and a gate 116 that is an end point of the runner 115 and serves as an inlet of the cavity 111 is formed at the bottom. . The runner 115 and the gate 116 may be formed on the bottom surface of the upper core 112. Cavity 111 may be made of a plurality as in this embodiment.

As an example, the second mold 120 may be a lower mold, and a cavity 121 is formed on a surface facing upwards, and the lower core 122 on which the cavity 121 is formed and a lower support plate fixed to the lower side thereof ( It may include a 123, 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 so that a runner 125 that provides a transfer passage of the molten resin from the sprue 114 to the cavity 121 is bottomed. The gate 126, which is formed at the end of the runner 125 and serves as the entrance of the cavity 121, is formed at the bottom surface of the runner 125. The runner 125 and the gate 126 may be formed on the upper surface of the lower core 122. The lower core 122 may be formed with the runner 125, the gate 126, and the cavity 121 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 installed to be fixed or liftable to the frame of the mold apparatus, either or both may be installed to be liftable by the drive device, on the opposite side of each other A plurality of first and

second guides

151 and 161 detachably coupled to guide the coupling position may be formed. Here, the driving device may be a device for converting the rotational force of the motor into a linear motion, or may be a cylinder operated by pneumatic or hydraulic pressure.

Referring to Figure 3 and 4, the cutting mill pin 130 may be made by cutting the stress concentration for the molding of the molten resin supported by the through-hole 127a, can be made of special steel In addition, even in the case of general thermal cutting, PMMA resin having a high defect rate can minimize cutting cracks. On the other hand, as in this embodiment, the gate 126 may be formed in a plurality to correspond to each of the cavity 121 is provided in a plurality around the runner (125). The cutting mill pin 130 may have a number corresponding to the number of the gate pieces 127 or the cavity 121 when the gate pieces 127 or the cavities 121 are plural, and are lifted by the lifting block 140 to each other. Can be combined. The lifting block 140 is reciprocated by a driving unit not shown. The driving unit may be a device for converting the rotational force of the motor into linear motion, or may be a cylinder driven by hydraulic pressure or pneumatic pressure.

The cutting mill pin 130 may have a horizontal tip 131 horizontally formed at an end positioned at the gate 126, and the cutting mill pin 130 may be cut over a wide area with respect to the cutting portion by the horizontal tip 131. Can be. In addition, the cutting mill pin 130 is in surface contact side by side in parallel to the gate piece 127 is installed in the second mold 120 corresponding to the lower mold to the bottom surface of each of the gate 126, as in the present embodiment through-hole It can be slidably installed to be orthogonal to 127a, which can be applied in all embodiments as well.

Referring to FIG. 5, as another example, the cutting mill pin 230 has a first acute tip 231 protruding at an acute angle from the end positioned at the gate 126 toward the cavity 121 at a portion of the end. The cutting efficiency may be increased by the inclined structure of the first acute tip 231.

Referring to FIG. 6, as another example, the cutting mill pin 330 has a second acute tip 331 protruding at an acute angle from the end positioned at the gate 126 toward the cavity 121. It may be formed in, it is possible to increase the cutting efficiency by the inclined structure of the second acute tip 331.

3, 4, and 7, the gate piece 127 may be made of, for example, alloy steel, and the passage hole 127a may be formed in the bottom surface of the gate 126 in the second mold 120 corresponding to the lower mold. ) May be installed vertically to expose. The through holes 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. In addition, the gate 126 may be formed 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 another example, the gate piece 337 may be formed to extend in the width direction so that the through holes 337a having semicircular shapes at both ends thereof are similar to an ellipse.

10 to 12 are side cross-sectional views for sequentially explaining a product manufacturing method using a mold having a cutting mill pin according to an embodiment of the present invention, molding the product using a mold having a cutting mill pin according to the present invention This is a manufacturing method, which will be mainly described with respect to a mold 100 having a cutting mill pin according to an embodiment of the present invention. As described above, the product may be, for example, a diffusion lens, but is not necessarily limited thereto, and may be applied to any product that can be manufactured using a synthetic resin.

Referring to FIG. 10, in the method of manufacturing a product using a mold having a cutting mill pin according to an embodiment of the present invention, first, molten resin is injected into the

cavities

111 and 121 in a state in which the first and

second molds

110 and 120 are closed. do. When the molten resin is injected from the nozzle (not shown) through the sprue 114, the molten resin is dispersed into the

gates

116 and 126 by the runner 115 and filled in the

cavities

111 and 121, wherein the molten resin is filled into the

gates

116 and 126. Pass through) passes through the passage hole 127a.

Referring to FIG. 11, after the molten resin is filled in the

cavities

111 and 121 and the molten resin in the

cavities

111 and 121 is cured, the driving means moves by one or both of the first and

second molds

110 and 120. The

cavities

111 and 121 are opened.

Referring to FIG. 12, when the

cavities

111 and 121 are opened, the product 1 formed by the

cavities

111 and 121 is moved by the driving unit so as to cross the

cavities

111 and 121 by the driving unit, so that the runner scrap 2 is formed. It is separated from the cutting and simultaneously withdrawn from the cavities (111,121).

According to the mold having the cutting mill pin and the product manufacturing method using the same according to the present invention, by cutting and taking out the product at the same time by the cutting mill pin installed in the tunnel gate, reducing the production process to increase productivity and reduce production costs Can contribute to a company's competitiveness.

In addition, according to the present invention, when the product performance, for example, the lens is a lens, the appearance defect rate other than the optical performance can be significantly lowered to reduce productivity and loss cost, and the cutting process using a separate cutter is omitted, thereby eliminating the use of consumables such as cutters. Significant cost savings can reduce the cost of replacing, manufacturing and modifying cutters.

In addition, according to the present invention, as the separate cutting process is omitted, the restriction of the cutter direction is eliminated in securing the cavity of the mass production mold, so that the restriction on the increase in the number of the cavity is removed, so that the number of the cavity can be easily expanded, and the tunnel By providing the gate piece in the gate, not only its production but also the cost and effort for maintenance and management can be reduced.

In addition, according to the present invention, when the length of the gate, such as a lens mold is within the approval criteria of the product can be made easy to maintain the precision of the gate length.

In addition, according to the present invention, the cutting mill pin is installed on the bottom of the tunnel gate, so as to have a cutting stability that is inferior to the existing thermal cutting, and to maintain a constant shape and a constant length of the product, such as the gate cut portion of the lens Satisfaction can be reduced to reduce productivity and defective rate.

As described above, the present invention has been described with reference to the accompanying drawings, but various modifications may be made without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be defined by the claims and their equivalents.

Claims

A cavity is provided between the first and second molds for molding the diffusion lens, a gate is provided at the inlet of the cavity, and a gate piece having a passage hole is located in the gate of the second mold. A cutting mill pin is installed to reciprocate in a direction intersecting the cavity by a driving unit in a state located at the side of the gate between the gate piece and the cavity, and runners a product formed by the cavity by the transfer of the cutting mill pin. To be cut from the crab and to be taken out,

The gate is formed in plurality so as to correspond to each of the cavities provided in a plurality around the runner,

The cutting mill pin may be slidably installed to be perpendicular to the through hole by being in surface contact with the gate pieces installed perpendicular to the bottom surface of each of the gates in the second mold corresponding to the lower mold. Multiple are coupled to each other by a lifting block reciprocated by

The gate piece is vertically installed to expose the through hole on the bottom surface of each of the gates formed to be orthogonal to the second mold corresponding to the lower mold, cutting mill pin for forming the diffusion lens, characterized in that Having a mold.
The method according to claim 1,

The cutting mill pin,

A mold having a cutting mill pin for shaping the diffusion lens, the horizontal tip is formed in the horizontal end is positioned at the gate.
The method according to claim 1,

The cutting mill pin,

A mold having a cutting mill pin for forming a diffuser lens, wherein a first acute-angle tip protruding at an acute angle from the end positioned at the gate toward the cavity is formed at a portion of the end.
The method according to claim 1,

The cutting mill pin,

A mold having a cutting mill pin for shaping a diffusion lens, wherein a second acute tip projecting at an acute angle on a side facing the cavity at an end positioned at the gate is formed at all of the ends.
The method according to claim 1,

The gate piece,

Molds having a cutting mill pin for forming a diffusion lens, characterized in that both ends are formed so that the through-hole having a semicircular shape extends in the width direction.
In the method of manufacturing a diffusion lens using a mold having a cutting mill pin according to claim 1,

Injecting molten resin into the cavity while the first and second molds are closed;

When the molten resin in the cavity is cured, allowing the cavity to open by movement of either or both of the first and second molds; And

When the cavity is opened, moving the cutting mill pin to cross the cavity by the driving unit so that the diffusion lens formed by the cavity is separated from the runner scrap and is cut out at the same time;

Method for producing a diffusion lens using a mold having a cutting mill pin, comprising a.