KR20120105741A

KR20120105741A - Mold

Info

Publication number: KR20120105741A
Application number: KR1020110023366A
Authority: KR
Inventors: 구자천; 정문기
Original assignee: 신성델타테크 주식회사
Priority date: 2011-03-16
Filing date: 2011-03-16
Publication date: 2012-09-26

Abstract

PURPOSE: An injection mold is provided to omit a process of removing gates as the gates are cut along the inclined plane of a molding product. CONSTITUTION: An injection mold comprises a sub-return pin(40), a plate spring(50), a gate cutting unit(60), and a guide groove. The side of an injection molding product(1) is inclined. The guide groove comprises a tilt angle corresponding to the side inclination of the injection molding product. The gate cutting unit moves along the guide groove, and cuts gates using the elastic force of the plate spring before the injection molding product is ejected.

Description

Injection Mold {Mold}

The present invention relates to an injection mold, and more particularly, the gate included in the injection molding can be automatically cut first before the injection molding is taken out of the mold after injection of the mold, and even if the sidewall of the injection molding has an inclined gradient. The present invention relates to an injection mold capable of simplifying an injection process since it is not necessary to remove a gate remaining after injection of a mold by a separate process by cutting the gate included in the injection molding along the slope.

In general, an injection mold for molding a plastic molding is provided with a lower mold and an upper mold, and the raw material of the injection molding is flowed into the inner space corresponding to the shape of the injection molding between the lower mold and the upper mold in a fluid form. To manufacture.

The runner, which is a passage through which the raw material of the injection molding flows, remains even after the injection molding is molded, and the residue having a constant thickness having a shape corresponding to that of the runner attached to the injection molding is generally called a gate.

Such a gate required to remove the injection molded product from the mold and then to remove the gate by a separate process. Therefore, the conventional mold work has a problem that the work process is complicated as the subsequent process is required.

In order to improve this, an apparatus for cutting a gate from the injection molding was developed, but there was a problem that the gate could not be cut perfectly.

The sidewall of the injection molding is generally not in the form of a vertical line but in the shape of an inclined sidewall, but the conventional device for cutting the gate has a problem that it moves only in the vertical direction.

That is, as shown in Figure 1, the injection molding (1) is usually attached to the gate (2). By the way, when the side surface of the injection molding (1), as shown in Figure 1, has an inclined surface formed inclined, the conventional device for cutting the gate is the cutting portion 3 for cutting the gate (2) in the vertical direction Only the residues of the gate 2 (represented by A in FIG. 2) remained on the side surface of the injection-molded article 1 after cutting the gate 2.

Therefore, the appearance quality of the injection molding (1) is degraded due to the remaining of the gate, and in severe cases, it causes a defect.

In addition, when the residues of the gate are manually removed, the injection process is complicated by that amount, resulting in an increase in manufacturing cost.

The present invention has been proposed to solve the above-mentioned problems, the object of which is to automatically cut the gate included in the injection molding first before taking out the injection molding from the mold after injection, and the sidewall of the injection molding Even with this inclined surface, the gate can be cut according to the inclination, so even if a small amount of gates remain after injection, there is no need to remove the remaining gate by a separate process, which simplifies the injection process. It is to provide an injection mold that can maximize the appearance quality of the molding.

The injection mold according to the present invention for achieving the above object, including a runner in which the raw material of the injection molding flows into the fluid, the fluid inside the runner is injected into a mold having an internal space corresponding to the shape of the injection molding The mold is divided into an upper mold and a lower mold, and after injection, the upper mold is opened to the lower mold. The mold is positioned below the lower mold, and an end thereof penetrates the lower mold and contacts the lower surface of the upper mold. When the lower mold and the upper mold are mutually opened, the sub-return pin which is raised in the direction in which the upper mold is located, is coupled to the lower side of the sub-return pin, and is compressed when the sub-return pin is moved downward, Dish soup that provides a restoring force to move the sub-return pin upwards when the lower mold and the upper mold are mutually opened. And a gate cutter coupled to the sub-return pin, the sub-return pin moving upward when the sub-return pin moves upward, and cutting a gate having a shape corresponding to the shape of the runner from the injection molded product. Guide the movement of the cutting machine, and includes a guide guide groove which is located below the injection molding, the injection molding has a form inclined its side, the guide guide groove is inclined angle corresponding to the side slope of the injection molding The gate cutting machine is moved to have an inclination angle corresponding to the lateral inclination of the injection molding along the guide of the guide guide groove to cut the gate before taking out the injection molding by using the restoring force of the dish spring. It is done.

In addition, the gate cutter of the injection mold according to the present invention is characterized in that the angle of the end is sharply formed so that the gate end is easily cut.

In addition, the injection mold according to the present invention is spaced apart from the lower mold and positioned below the lower mold, the upper ejector plate and the lower ejector plate which is provided with two plates, and wave upwards from the lower surface of the upper ejector plate. An upper base receiving groove which is an excitation groove, a lower base receiving groove which is a groove which is dug downward from the lower surface of the lower ejector plate, and a plate spring positioning pin which is inserted into the lower basic receiving groove and prevents the position of the dish spring from shifting. The sub-sub ejector plate to be accommodated, the sub-base ejection plate is inserted into the upper base receiving groove, the sub-pin ejection hole is in contact with the lower sub-ejector plate, the sub-return pin is penetrated through the link pin through-hole The upper sub ejector plate and the link pin is located through the through hole, the end of the lower sub And a link pin in contact with an upper surface of the plate plate and coupled to the gate cutter to move the gate cutter upward and downward, wherein an end of the sub return pin is in contact with an upper surface of the lower sub ejector plate. One end of the spring is coupled to the lower surface of the lower sub-ejector plate, and the other end is coupled to the lower surface of the lower base receiving groove, and has a hole penetrated in the center thereof. Positioned through the hole so that the position of the dish spring does not deviate, the dish spring moves the lower sub ejector plate upward with a restoring force, and the lower sub ejector plate is instantaneously moved upward by the restoring force of the dish spring. When the link pin is instantaneously moved upward And the gate cutter coupled to the link pin is momentarily moved upward to cut the gate of the injection molded product.

According to the injection mold according to the present invention, the gate included in the injection molding can be automatically cut first before the injection molding is ejected from the mold after the injection of the mold, and according to the inclination even if the sidewall of the injection molding has an inclined slope. Since the gate can be cut, even a small amount of gate remains after injection, there is no need to remove the remaining gate as a separate process, which simplifies the injection process and has the effect of maximizing the appearance quality of the injection molding. have.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

1 is a view showing a state that the gate is attached to the injection molding
2 is a view showing the appearance of a device for cutting a gate in a conventional injection molding
3 is a view showing the configuration of an injection mold according to an embodiment of the present invention
4 is a view showing a state in which the sub-return pin, the link pin and the gate cutter of the injection mold shown in FIG.
5 is a cross-sectional view taken along the line AA of FIG.
6 to 9 are views for explaining the use state of the injection mold shown in FIG.

Hereinafter, an injection mold according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 to 9 show an injection mold according to an embodiment of the present invention, Figure 3 is a view showing the configuration of the injection mold according to an embodiment of the present invention, Figure 4 is a view of the injection mold shown in FIG. 5 is a cross-sectional view taken along line AA of FIG. 4, and FIGS. 6 to 9 are views illustrating a state of use of the injection mold illustrated in FIG. 3. Will be shown respectively.

As shown in the figure, the injection mold 100 according to an embodiment of the present invention is a sub-return pin 40, the dish spring 50, the gate cutter 60, the guide guide groove 95 It is included.

Injection mold 100 according to the present embodiment also includes a runner 10 for molding the injection molding (1) as in the prior art, divided into an upper mold 20 and a lower mold 30, the upper mold after injection ( 20) takes the form of opening with respect to the lower mold (30).

The sub-return pin 40 is positioned below the lower mold 30, and an end thereof penetrates the lower mold 30 to contact the lower surface of the upper mold 20, and the lower mold 30. When the upper mold 20 is mutually opened, the upper mold 20 is raised in the direction in which it is located.

The dish spring 50 is coupled to the lower side of the sub-return pin 40, the sub-return pin 40 is compressed when moved downward, the lower mold 30 and the upper mold 20 mutually It is to provide a restoring force for moving the sub-return pin 40 upward at the moment of release.

The gate cutter 60 is coupled to the sub-return pin 40, and when the sub-return pin 40 moves upward, the gate cutter 60 moves upward, and the runner 10 is removed from the injection molding 1. The gate 2 having a shape corresponding to the shape is cut.

In addition, the gate cutter 60 is preferably formed so that the angle of the end sharply so that the end of the gate (2) is easily cut.

The guide guide groove 95 guides the movement of the gate cutter 60, and is located below the injection molding 1.

In the present embodiment, the injection molding 1 has an inclined side surface, and the guide guide groove 95 has an inclination angle corresponding to the inclination of the side surface of the injection molding 1.

Accordingly, the injection mold 100 according to the present embodiment uses the restoring force of the dish spring 50 to allow the gate cutting machine 60 to be ejected along the guide of the guide guide groove 95 before taking out the injection molding. It is characterized in that the inclined angle corresponding to the inclination of the side of the molding 1 is moved to cut the gate (2).

Meanwhile, the state in which the sub return pin 40 and the gate cutter 60 are coupled to each other will be described in detail with reference to FIGS. 4 and 5.

The injection mold 100 according to the present embodiment includes an upper ejector plate 71 and a lower ejector plate 72, an ejector rod 73, a return pin 74, an upper base receiving groove 75, and a lower part. The base receiving groove 76, the lower sub ejector plate 78, the upper sub ejector plate 82, and the link pin 80 are further included.

The upper ejector plate 71 and the lower ejector plate 72 are spaced apart from the lower mold 30 and positioned below the lower mold 30, and refer to two abutting plates.

The ejector rod 73 raises the upper ejector plate 71 and the lower ejector plate 72.

The return pin 74 has a lower end coupled to the lower ejector plate 72 and an upper end contacting a lower surface of the upper mold 20 so that the lower mold 30 is positioned when the upper mold is closed. The upper ejector plate 71 and the lower ejector plate 72 serve to return to their original positions.

The upper base receiving groove 75 refers to a groove dug upward from the lower surface of the upper ejector plate 71.

The lower base receiving groove 76 refers to a groove dug downward from the lower surface of the lower ejector plate 72.

The lower sub ejector plate 78 is inserted into the lower base receiving groove 76 and accommodates the dish spring positioning pin 51 which prevents the position of the dish spring 50 from shifting.

The upper sub ejector plate 82 is inserted into the upper base receiving groove 75, is in contact with the lower sub ejector plate 78, and the sub pin through hole 40 is positioned through the sub return pin 40. 79) and a link pin through-hole 81 that is a through hole.

The link pin 80 is located through the link pin through-hole 81, the end is in contact with the upper surface of the lower sub- ejector plate 78, is coupled to the gate cutter 60 and the gate cutter ( 60) to move up and down.

In addition, the end of the sub-return pin 40 is in contact with the upper surface of the lower sub- ejector plate 78.

The dish spring 50 is positioned between the lower sub ejector plate 78 and the lower base receiving groove 76 to move the lower sub ejector plate 78 upward with a restoring force.

That is, one end of the dish spring 50 is coupled to the bottom surface of the lower sub ejector plate 78, and the other end is coupled to the bottom surface of the lower base receiving groove 76.

In addition, the dish spring 50 has a hole through the center thereof.

In addition, the dish spring positioning pin 51 is located through the hole penetrated in the center of the dish spring 51 so that the position of the dish spring 51 is not shifted.

In addition, the dish spring 50 is to move the lower sub ejector plate 78 upward with a restoring force.

Therefore, when the lower sub-ejector plate 78 is instantaneously moved upward by the restoring force of the dish spring 50, the link pin 80 is instantaneously moved upward and coupled with the link pin 80. The gate cutter 60 is momentarily moved upward to cut the gate 2 of the injection molded product 1.

Injection mold 100 according to an embodiment of the present invention having the configuration as described above is operated as follows.

The injection molding machine is completed and the lower sub-ejector plate 78 is instantaneously upward with the restoring force of the dish spring 50 at the starting point where the upper mold 20 is opened with respect to the lower mold 30 by the injection molding machine. Is moved. Accordingly, the gate cutter 60 is instantaneously moved upward.

That is, when the lower sub ejector plate 78 is instantaneously moved upward by the restoring force of the dish spring 50, the sub return pin 40 is also instantaneously moved upward, and the lower sub ejector plate 78 Link pin 80 coupled to the upper surface of the) is also moved upwards.

Therefore, the gate cutter 60 coupled with the link pin 80 is momentarily moved upwards to cleanly cut the gate 2 before the injection molding 1 is ejected from the mold.

When the mold opening is completed, that is, when the ejector rod 73 rises, the upper ejector plate 71 and the lower ejector plate 72 are continuously moved upward, and the upper ejector plate 71 and the lower ejector Injection injection rod (90) coupled with the plate 72 is raised to take out the injection molding (1).

Therefore, since the injection mold 100 according to the present invention first cuts the gate 2 included in the injection molding 1 before the injection molding 1 is taken out, the appearance quality of the injection molding 1 is excellent. Will be.

When the injection molded product 1 is taken out through the above-described process and the injection process is completed, the ejector rod 73 is moved downward again and the upper mold 20 and the lower mold 30 are operated by the operation of the injection molding machine. They are reunited with each other.

In this case, when the lower surface of the upper mold 20 presses the return pin 74 and the sub return pin 40, the upper ejector plate 71 and the lower ejector plate 72 are moved downward, The lower sub ejector plate 78 and the upper sub ejector plate 82 are also moved downward to compress the dish spring 50 again.

Meanwhile, as shown in FIG. 6, the gate cutter 60 is coupled to the upper side of the link pin 80, and the guide guide groove 95 of the gate cutter 60 is inserted into the injection molded product 1. Since the gate cutter 60 cuts the gate 2 along the side slope of the injection molding 1, the gate cutter 60 cuts smoothly without leaving any residues of the gate. Will be.

When the guide guide groove 95 is formed in the vertical direction, the gate cutter 60 may be moved in the vertical direction.

10. Runner 20. Upper mold
30. Lower mold 40. Sub-return pin
50. Dish spring 60. Gate cutter
71. Upper ejector plate 72. Lower ejector plate
75. Upper base receiving groove 76. Lower base receiving groove
78. Lower sub ejector plate 80. Link pin
82. Upper sub ejector plate 95. Guide groove

Claims

Including the runner 10 in which the raw material of the injection molding 1 flows into the fluid, the fluid inside the runner 10 is injected into a mold having an internal space corresponding to the shape of the injection molding, and the upper mold 20 and In the mold divided into the lower mold 30, the upper mold 20 is opened to the lower mold 30 after injection,
Located below the lower mold 30, the end penetrates through the lower mold 30 and contacts the lower surface of the upper mold 20, and the lower mold 30 and the upper mold 20 cross each other. A sub-return pin 40 which rises in the direction in which the upper mold 20 is positioned when the upper mold 20 is positioned;
The sub return pin 40 is coupled to the lower side of the sub return pin 40, and when the sub return pin 40 moves downward, the sub return part is compressed when the lower mold 30 and the upper mold 20 are mutually opened. Dish spring 50 to provide a restoring force for moving the pin 40 upward;
It is coupled to the sub-return pin 40, the sub-return pin 40 is moved upwards at the same time, and has a shape corresponding to the shape of the runner 10 from the injection molding (1) A gate cutter 60 for cutting the gate 2;
And a guide guide groove 95 which guides the movement of the gate cutter 60 and is located below the injection molding 1.
The injection molded article 1 has a form inclined at its side,
The guide guide groove 95 has an inclination angle corresponding to the inclination of the side surface of the injection molding (1),
The gate cutting machine 60 has an inclination angle corresponding to the inclination of the side surface of the injection molding 1 along the guide of the guide guide groove 95 before taking out the injection molding by using the restoring force of the dish spring 50. Injection mold which is moved to cut the gate (2).

The method of claim 1,
The gate cutter 60 is an injection mold, characterized in that the angle of the end is sharply formed so that the gate end is easily cut.

The method of claim 1,
Spaced apart from the lower mold 30 and positioned below the lower mold 30, the upper ejector plate 71 and the lower ejector plate 72 formed of two plates;
An upper base receiving groove 75 which is a groove dug upward from the lower surface of the upper ejector plate 71;
A lower base receiving groove 76 which is a groove dug downward from a lower surface of the lower ejector plate 72;
A lower sub ejector plate 78 inserted into the lower base receiving groove 76 and accommodating a dish spring positioning pin 51 for preventing the dish spring 50 from shifting;
A sub-pin through hole 79 inserted into the upper base receiving groove 75 and in contact with the lower sub-ejector plate 78 and positioned to penetrate the sub-return pin 40; An upper sub ejector plate 82 having a pin through hole 81;
It is located through the link pin through hole 81, the end is in contact with the upper surface of the lower sub- ejector plate 78, coupled with the gate cutter 60 moves the gate cutter 60 in the vertical direction To further include a link pin 80,
An end of the sub return pin 40 is in contact with the upper surface of the lower sub ejector plate 78,
The plate spring 50 has one end coupled to the bottom surface of the lower sub ejector plate 78 and the other end coupled to the bottom surface of the lower base receiving groove 76 and has a hole penetrated at the center thereof.
The dish spring positioning pin 51 is located through the hole penetrated in the center of the dish spring 51 so that the position of the dish spring 51 is not shifted.
The dish spring 50 moves the lower sub ejector plate 78 upward with a restoring force,
When the lower sub-ejector plate 78 is instantaneously moved upward by the restoring force of the dish spring 50, the link pin 80 is instantaneously moved upward and coupled to the link pin 80. Injection molder, characterized in that the gate cutter 60 is moved upwards momentarily to cut the gate of the injection molding.