KR200464732Y1

KR200464732Y1 - Core pin for die

Info

Publication number: KR200464732Y1
Application number: KR2020110010736U
Authority: KR
Inventors: 박종섭
Original assignee: (주)한세미크론
Priority date: 2011-12-02
Filing date: 2011-12-02
Publication date: 2013-01-21

Abstract

The core pin for a mold of the present invention has a hollow formed therein, one side of which is stepped, the diameter of which is smaller than the other side, and a screw thread formed on an outer circumferential surface of one side; A hollow formed therein, threads formed on both inner circumferential surfaces thereof, and one side of which is screwed to one side of the head; Hollow is formed inside, one side is stepped, the diameter is smaller than the middle portion, a screw thread is formed on the outer peripheral surface of one side is screwed to the other side of the body; And an O-ring interposed between the head and the body and between the body and the hole pin to seal the interior.
According to this, the head, the body and the hole pins can be assembled and detached by screwing, and the head and the body disposed outside the cavity of the mold are made of special steel which is cheaper than brass as the material, and is placed in the cavity to be injected Hole pins that form bosses such as grooves are more expensive than conventional ones by using brass, which is expensive but has excellent thermal conductivity and is advantageous for the processing of injection moldings.

Description

Core pin for mold {CORE PIN FOR DIE}

The present invention relates to a core pin for a mold, and more particularly, to a core pin of brass material used to form a hole or the like in an injection molding during die casting casting.

In general, die casting, also referred to as die casting, is a precision casting method in which molten metal is injected into a mold of a steel machined to be precisely matched to the required casting shape, thereby obtaining the same casting as the mold.

The product produced by die casting casting has the advantage that almost no need to be trimmed because the dimensions are accurate, and also it is characterized by excellent mechanical properties and mass production.

Metals used for die casting casting include alloys such as zinc, aluminum, tin, copper, and magnesium, and many products include automotive parts, and other electric and optical devices, vehicles, weaving machines, construction, and measuring instrument parts.

On the other hand, in the product produced by die casting casting, the boss portion may be formed in the required portion.

However, since the boss part is likely to cause casting defects such as poor shrinkage during die casting casting, the weight loss is performed in the material state, and the core pin of the brass material is used at this time.

The core pin has a hollow hole formed therein, and cools the core pin by flowing coolant to the hollow hole during die casting casting.

As such, when the core pin is cooled by using coolant during die casting casting, not only the occurrence of casting defects such as shrinkage defects can be prevented, but the produced product can have a uniform cross section.

By the way, the conventional core pin is composed of one component integrally formed irrespective of the total length, but the brass material can not be formed by hot working, and is directly cut, so that the manufacturing cost increases.

In addition, when forming the hollow hole in the core pin has a problem that it is difficult to form a straight line without being eccentric with respect to the longitudinal center line.

That is, the hollow hole is usually formed by the processing of a general drill or a gun drill (gun drill), when the length of the core pin is a predetermined length or more, the bending occurs at the end of the hollow hole, thereby the hollow hole There was a problem that the entire length is not formed in a straight line.

As such, if the hollow hole of the core pin is machined to be eccentric with respect to the longitudinal center line, it becomes impossible to uniformly cool during die casting casting, which in turn results in deterioration of the product.

The object of the present invention is to provide an improved mold core pin which is economical and can easily form a hollow hole by lowering the manufacturing cost.

The core pin for a mold of the present invention has a hollow formed therein, one side of which is stepped, the diameter of which is smaller than the other side, and a screw thread formed on an outer circumferential surface of one side; A hollow formed therein, threads formed on both inner circumferential surfaces thereof, and one side of which is screwed to one side of the head; Hollow is formed inside, one side is stepped, the diameter is smaller than the middle portion, a screw thread is formed on the outer peripheral surface of one side is screwed to the other side of the body; And an O-ring interposed between the head and the body and between the body and the hole pin to seal the interior.

The head and the body are formed of a special steel, the hole pin is preferably formed of brass.

The head is stepped into two stages on one side, and a thread is formed at one end, and one side inner circumferential surface of the body is stepped into two stages, and a thread is formed at a stepped portion of the center side of one side inner circumferential surface, thereby forming a thread of the head. The screw is coupled to the end, and one side end of the circumferential surface of the pilgrim form is closely coupled to the stepped portion of the pilgrim form of the head, and the other side is stepped into two stages based on the middle portion of the hole pin, and the other end has a cone shape. It is preferred that it is formed.

According to the core pin of the present invention, the head, the body and the hole pin can be assembled and separated by screwing, and the head and the body disposed outside the cavity of the mold are made of special steel, which is less expensive than brass as the material. Hole pins disposed in the cavity to form bosses such as grooves in the injection molding are expensive, but have an economical advantage over conventional ones by using brass, which is advantageous in processing the injection molding because of excellent thermal conductivity.

In other words, in the case of a conventional integral core pin made of brass, if the hole pin portion needs to be replaced due to wear, etc., the integrated core pin had to be replaced with a new core pin. Combined, it has economic advantages.

In addition, in the case of an integral core pin, there is a disadvantage in that it is difficult to form a straight line without being eccentric due to a long length when forming a hollow inside, but the present invention only needs to form a hollow for each of the head, the body and the hole pin. Therefore, it is easy to form the hollow, and thus has the advantage of preventing the occurrence of casting defects such as shrinkage failure.

1 is a perspective view schematically showing a core pin for a mold according to an embodiment of the present invention.
Figure 2 is an exploded perspective view schematically showing the core pin for a mold of Figure 1;
3 is a cross-sectional view schematically showing the core pin for a mold of FIG.

Hereinafter, the core pin for a mold of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view schematically showing a core pin for a mold according to an embodiment of the present invention, Figure 2 is an exploded perspective view schematically showing the mold core pin of Figure 1, Figure 3 schematically shows the core pin for a mold of Figure 1 It is sectional drawing shown.

1 to 3, the core pin for a mold of the present invention includes a head 110, a body 120, a hole pin 130, and an O-ring 140.

The head 110, the body 120 and the hole pin 130 are all formed inside the hollow to provide a movement path of the coolant, the head 110 and the body 120 is made of a special steel material, the hole pin ( 130 is made of brass with excellent thermal conductivity.

One side of the head 110 is stepped and its diameter is smaller than the other side, the step may be formed in two stages.

Here, a thread is formed on the outer circumferential surface of the portion having the smallest diameter among the stepped portions.

Threads are formed on both inner circumferential surfaces of the body 120, and one side is screwed with the head 110.

Here, when the head 110 is formed in the form of a screw thread in the smallest portion in the form of stepped in two steps, the inner peripheral surface of one side of the body 120 may be a step formed in one or two steps, 1 In the case where the step is formed in step, only the threaded part of the head 110 is inserted into the body 120 and screwed in. In the case where the step is formed in the second step, the outer part of the second step is in the form of private A thread is not formed, and a thread is formed in the stepped portion on the central side, so that all of the stepped portions of the head 110 are inserted into the body 120 and screwed together.

Here, the length of the portion of the inner circumferential surface of the body 120, the thread is not formed is not formed of the thread of the stepped portion of the head 110, is formed the same as the length of the portion having an intermediate diameter body 120 When the head 110 is inserted into the hollow of the threaded portion is screwed, the thread-shaped portion is not formed is in close contact.

The hole pin 130 has one side stepped to have a diameter smaller than that of the middle portion, and a thread is formed on the outer circumferential surface and screwed to the other inner circumferential surface of the body 120.

The hole pin 130 has a cone shape at the other side with respect to the middle portion, and the cone shape portion is disposed in the cavity of the mold in which the injection molded product is accommodated.

Here, the other side may also have a stepped form in two stages.

The O-ring 140 is provided with two, it is interposed between the head 110 and the body 120 and between the body 120 and the hole pin 130 to prevent the external outflow of the cooling water moved through the hollow inside.

The core pin for a mold having the structure as described above is a form in which the head 110, the body 120 and the hole pin 130 can be assembled and separated by screwing, and are disposed outside the cavity of the mold. 120 is made of special steel which is cheaper than brass as its material, and the hole pins 130, which are arranged in the cavity to form bosses such as grooves in the injection molding, are expensive, but have excellent thermal conductivity and use brass which is advantageous for processing the injection molding. By doing so, it has an economical advantage over the conventional.

That is, in the case of the conventional integral core pin made of brass, when the hole pin 130 is required to be replaced due to wear, etc., the integrated core pin had to be replaced with a new core pin. However, the present invention requires only the hole pin 130 as the body 120. ) And remove the new hole pin 130 to the body 120 has an economic advantage.

In addition, in the case of an integral core pin, there is a disadvantage in that it is difficult to form a straight line without being eccentric due to a long length when hollow is formed therein. Since it is only necessary to form and join the hollow, it is easy to form the hollow, and thus has the advantage of preventing the occurrence of casting defects such as shrinkage failure.

110 ... head
120 ... body
130 ... Holpin
140 ... O-Ring

Claims

A hollow is formed inside, one side is stepped, the diameter is smaller than the other side, the head is formed on the outer peripheral surface of one side;
A hollow formed therein, threads formed on both inner circumferential surfaces thereof, and one side of which is screwed to one side of the head;
Hollow is formed inside, one side is stepped, the diameter is smaller than the middle portion, a screw thread is formed on the outer peripheral surface of one side is screwed to the other side of the body; And
And an O-ring interposed between the head and the body and between the body and the hole pin to seal the inside thereof.
The head is stepped into two stages on one side so that a thread is formed at one side end,
One side inner circumferential surface of the body is stepped into two stages, the thread is formed in the stepped portion of the center side of the one inner circumferential surface is screwed with one side end formed with the thread of the head, the circumferential shape of the head on one side end The stepped part of the tightly coupled,
The other side is stepped in two stages based on the middle portion of the hole pin, the other end is a core pin for a mold, characterized in that formed in a cone shape.

The method according to claim 1,
The head and the body is formed by a special steel, the core pin for a mold, characterized in that formed by brass.

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