JP2564850Y2 - Mold equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die apparatus such as die casting or injection molding. More specifically, an inner pipe is coaxially inserted into an outer pipe and fixed thereto, and the circulation path of the cooling water and the return path are determined. The present invention relates to an improvement in a mold apparatus which inserts and installs a cooling pipe having a structure into a cooling hole and circulates cooling water into the cooling hole to control a mold temperature.

[0002]

2. Description of the Related Art In general, a mold apparatus of this type is configured such that an outer pipe and an inner pipe constituting a cooling pipe are straight pipes formed of copper, iron, aluminum, an alloy thereof, or the like. The cooling water is sent toward the hole bottom of the cooling hole through the inner pipe which is the outward path of the cooling water, and is inserted and installed in the cooling hole opened in the component members (drawing core, cast pin, etc.). The mainstream is to employ a circulation system that returns from the return path to the outside of the cooling hole from the return path between the outer peripheral surface of the inner pipe and the inner peripheral surface of the outer pipe. By the way, the cooling pipe inserted into the cooling hole needs to be pulled out and removed from the cooling hole at the time of repairs and inspections regularly performed to maintain the mold. It is a condition to adopt an installation mode of detachably inserting and installing. Therefore, there is a restriction that the cooling pipe can be installed only in a place where the cooling hole can be linearly opened toward the cavity surface in the related art. For example, in the case of the drawing core 2 shown in FIG. In a place avoiding the portion where the eight ends are connected, the cooling hole can be opened linearly toward the cavity surface 10 to install the cooling pipe, but the rod to which the tip of the rod 8 of the drawing cylinder is connected In the cavity surface 10 located on the axis extension line, the cooling pipe cannot be installed because the cooling hole cannot be opened linearly because the rod 8 connection joint 9 is installed. Therefore, it is not possible to expect effective cooling such that the cooling water cannot be sent close to the cavity surface of the part where the thickness is locally large and the amount of heat is particularly large as compared with the part where the product thickness is small, and is particularly necessary. There is a problem, which causes internal defects such as shrinkage cavities and seizures due to the difference in solidification rate between the thin portion and the thick portion, and a countermeasure has been desired.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional situation, and a technical problem to be solved is a cavity surface at a place where a cooling hole cannot be opened linearly. It is an object of the present invention to provide a mold device improved so that even if it is a part, the bottom of the cooling hole is brought close to the cavity surface of the part and cooling water can be effectively sent to the part and cooled effectively.

[0004]

Means for Achieving the Object The technical measures taken by the present invention to achieve the above-mentioned object are as follows. An inner pipe is loosely inserted and installed concentrically in an outer pipe so that a circulation path of cooling water and a return path are formed. In a mold apparatus in which a cooling pipe having a double pipe structure is inserted and installed in a cooling hole, a flexible heat-resistant pipe is fixedly connected to a tip of an inner pipe of the cooling pipe, and a second pipe in which an outer pipe is inserted. A cooling hole comprising one hole and a second hole, which communicates with the bottom of the first hole in an intersecting manner and into which a flexible heat-resistant pipe is inserted, is provided.

[0005]

According to the technical means of the present invention described above, the first mold is directed toward the cavity surface of the mold and its constituent members.
A bent cooling hole formed by opening a hole and a second hole communicating with the bottom of the first hole in an intersecting manner is provided, and an inner pipe of a cooling pipe formed to have a length corresponding to the depth of the first hole is provided. By connecting a flexible heat-resistant pipe formed to a length corresponding to the depth of the second hole to the tip and inserting a cooling pipe with the heat-resistant pipe into the cooling hole, the inner pipe is formed together with the outer pipe. At the same time, the heat-resistant pipe is bent and inserted from the first hole to the second hole, and its tip is located at the bottom of the second hole.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a drawing core 2 which is incorporated in a mold 1 so as to be slidably movable. This shows the mold apparatus of the present embodiment in which a cooling pipe 4 is inserted and installed. The cooling pipe 4 has an inner pipe 4b concentrically inserted into an outer pipe 4a formed of copper, iron, aluminum or an alloy thereof. A well-known double pipe structure in which a cooling water circulation forward path 5 and a return path 6 are installed and a water supply / drain port 4c for hose connection is attached to one end of both pipes 4a and 4b,
The flexible heat-resistant pipe 7 is fixedly connected to the end of the inner pipe 4b.

The flexible heat-resistant pipe 7 extends from the tip of the inner pipe 4b to the second hole 3b so that the cooling water is sent to the bottom of the second hole 3b of the cooling hole 3 described later by extending the outward path 5 of the cooling water.
The outgoing path 5 of the cooling water reaching the bottom is extended, and is formed to be approximately the same thickness as the inner pipe 4b by a suitable flexible heat-resistant material such as a fluororesin material.
The inner pipe 4b protruding from the inner pipe 4b is fitted and fixed to the outer end of the inner pipe 4b for connection.

The cooling hole 3 has a first hole 3a into which the inner pipe 4b is inserted together with the outer pipe 4a, and a second hole through which the flexible heat-resistant pipe 7 is inserted so as to cross the bottom of the first hole 3a.
A bent shape is formed from the hole 3b. That is, as in the illustrated example,
The first hole 3a is opened at an appropriate depth from the rod connection surface of the drawing core 2 in which the connection joint 9 to which the tip of the rod 8 of the drawing cylinder is connected is installed in parallel with the rod axis extension line. The second hole 3b communicates with the bottom of the first hole 3a in an oblique crossing manner, and extends from the sliding contact surface of the drawing core 2 with the mold 1 so that the bottom of the hole approaches the cavity surface 10. The opening is inclined toward the portion of the cavity surface 10 located at
A cooling hole 3 having a bent shape toward the core 2 is formed in the drawn core 2. A plug lid 11 is screwed into the opening of the second hole 3b that opens to the sliding contact surface of the drawing core 2, and the opening is closed.

The first hole 3a and the bottom of the first hole 3a communicate with the first hole 3a and the bottom of the first hole 3a from the rod connecting surface of the drawing core 2 to which the tip of the rod 8 of the drawing cylinder is connected to the cavity surface 10. A cooling hole 3 having a bent shape formed by opening a second hole 3b is provided in the drawing core 2, and a second cooling pipe 4 having a length corresponding to the depth of the first hole 3a is provided at a tip of an inner pipe 4b of the cooling pipe 4. A flexible heat-resistant pipe 7 having a length corresponding to the depth of the two holes 3b is connected, and a cooling pipe 4 to which the heat-resistant pipe 7 is attached is inserted into the cooling hole 3 and installed. Then, the inner pipe 4b is linearly inserted into the first hole 3a together with the outer pipe 4a in a well-known manner, and the heat-resistant pipe 7 is bent and inserted from the first hole 3a to the second hole 3b, and the tip is inserted. It is located at the bottom of the second hole 3b located close to the cavity surface 10. Therefore, according to the mold apparatus of the present embodiment, the connection joint 9 to which the end of the rod 8 of the drawing cylinder is connected.
Where the cooling hole cannot be opened linearly due to the installation of the rod, that is, the cavity surface located on the rod axis extension line
Even in a place where a cooling hole cannot be opened linearly toward the portion 10, the bent cooling hole 3 is provided toward the cavity surface 10, and a flexible heat-resistant pipe 7 is provided in the cooling hole 3. By inserting and installing the attached cooling pipe 4, it is possible to send cooling water close to the cavity surface 10 of the relevant portion and effectively cool it.

In the above embodiment, the drawing structure of the drawing core 2 by the drawing cylinder has been described in detail. However, the present invention is not limited to such a structure. Similarly, it is also possible to freely form a cooling hole 3 having a bent shape in another die constituent member such as a cast pin, and insert and install a cooling pipe 4 to which a flexible heat-resistant pipe 7 is attached. Further, the inner pipe 4b of the cooling pipe 4 itself may be a flexible heat-resistant pipe 7. That is, the flexible heat-resistant pipe 7 is formed to have a length from the first hole 3a of the cooling hole 3 to the bottom of the second hole 3b, and one end thereof is connected to the hose connection water supply / drainage of the cooling pipe 4 similarly to the inner pipe 4b. The cooling water outward path 5 may be fixedly connected to the port 4c so as to be constituted only by the flexible heat-resistant pipe 7.

[0011]

[Effects of the Invention] Since the mold apparatus of the present invention is constructed as described above, the following effects are obtained. A flexible heat-resistant pipe is connected and fixed to the tip of the inner pipe of the cooling pipe, and a first hole for inserting the outer pipe and a second hole for communicating the flexible heat-resistant pipe with the bottom of the first hole in an intersecting manner. A cooling hole formed at the tip of the inner pipe of the cooling pipe formed at a length corresponding to the depth of the first hole. By connecting a pipe and inserting the cooling pipe with the heat-resistant pipe into the cooling hole, the inner pipe is inserted into the first hole together with the outer pipe, and the heat-resistant pipe is moved from the first hole to the second hole. And the tip can be positioned at the bottom of the second hole. Therefore, according to the mold apparatus of the present invention, a position where the cooling hole cannot be opened linearly because the connection joint to which the rod end of the drawing cylinder is connected is installed, that is, the position on the rod axis extension line Even in a place where the cooling hole cannot be opened linearly toward the cavity surface portion, the bottom of the cooling hole is brought close to the cavity surface of the portion toward the cavity surface portion, and cooling water is supplied to the portion. Internal defects such as shrinkage cavities due to the difference in solidification speed between thin and thick parts that occurred because effective cooling can not be expected as in the past due to effective cooling It is possible to eliminate all problems such as generation of image sticking and seizure.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a main part of a mold device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Die 2 ... Drawing core 3 ... Cooling hole 3a ... 1st hole 3b ... 2nd hole 4 ... Cooling pipe 4a ... Outer pipe 4b ... Inner pipe 5 ... Outbound path 6 ... Return path 7 ... Flexible heat resistant pipe 10 ... Cavity surface

Claims (1)

(57) [Scope of request for utility model registration] 1. A mold in which an inner pipe is loosely inserted and installed in an outer pipe and a cooling pipe having a double pipe structure comprising a cooling water circulation outward path and a return path is inserted and installed in a cooling hole. In the device, a flexible heat-resistant pipe is connected and fixed to the tip of the inner pipe of the cooling pipe, and is connected to the first hole for inserting the outer pipe and the bottom of the first hole in an intersecting manner to connect the flexible heat-resistant pipe. A mold device comprising a cooling hole comprising a second hole to be inserted.