WO1991003337A1

WO1991003337A1 - Method of manufacturing metallic mold having heating cooling pipe incorporated

Info

Publication number: WO1991003337A1
Application number: PCT/JP1990/001119
Authority: WO
Inventors: Yoshiharu Waku; Morie Kotani; Hideho Yoshioka; Ryoichi Miyauchi
Original assignee: Ube Industries, Ltd.
Priority date: 1989-09-01
Filing date: 1990-08-31
Publication date: 1991-03-21

Abstract

A method of manufacturing a metallic mold (5 or 24) having a heating cooling pipe incorporated and being such that a metallic pipe in a given shape is located in a given position in the cavity of the casting mold and molten metal is poured into the mold cavity so as to enclose the metallic pipe, wherein the metallic pipe (21) is composed of (A) a multi-layer metallic pipe or (B) metallic bars (or strips) each having an axially piercing hole and welded to each other so as to be formed into a specified shape. When pouring molten metal into the mold (3 or 22), cooling medium (gas or water) is passed through the metallic pipe (10 or 21)

Description

Description Manufacturing method of mold with built-in heating and cooling pipes Technical field

The present invention relates to a method for manufacturing a mold used in plastic molding, aluminum (A £) die casting, hot working, and the like.

The present invention particularly relates to a method for manufacturing a mold having a heating / cooling pipe wrapped around by a manufacturing method. Background art

In plastics and aluminum molding, it is extremely important to accurately control the temperature of the mold in accordance with the molding material molding conditions in terms of quality control of the molded product, improvement in productivity, and extension of the life of the mold. That is what. Therefore, it is necessary to form a passage for a heating / cooling medium such as oil, water, or gas inside the mold. In the current situation, the mold is manufactured by machining, and then through holes are formed in the mold by drilling. Alternatively, a blind hole is used to form a cooling medium passage.

As described above, when a hole is formed by drilling to form a heating / cooling medium passage, it is difficult to form a desired cooling passage in the mold with a straight line combination of the opened holes, and the heating of the mold is difficult. · Cooling did not work well, and the cost of drilling required high machining costs, which required a lot of processing time. Furthermore, if a cooling passage cannot be formed to the point where cooling is required, a local temperature rise in the mold during actual operation is likely to occur, which significantly reduces the life of the mold. There was a problem.

In such a case, if a commercially available carbon steel (JI SG 3452 and JISG 3454) is used for the cooling pipe, a pipe with an inner diameter of about 10 ø is thinner with a thickness of 2 to 3 verses, and injected into a cycling type. Depending on the type of molten metal in the mold, the cooling pipe is easily melted. In order to prevent this erosion, attempts have been made to coat the cooling pipe with a wire wound on the surface of the cooling pipe, or by spraying or applying ceramic powder. However, when winding or coating such a cooling pipe, the interface between the cooling pipe and the molten metal (mold metal) tends to be defective at the interface between the cooling pipe and the molten metal (mold metal) when cycling. Not only that, it is also very difficult to prevent erosion. Disclosure of the invention

An object of the present invention is to provide a method of manufacturing a mold having a heating / cooling passage inside a mold by circling a metal pipe by a structure, instead of making a hole in the mold by drilling. That is.

In order to achieve this object, the present invention installs a metal pipe of a predetermined shape at a predetermined position in a cylindrical cavity, injects a molten metal into the 籙 -shaped cavity, cyclizes the metal pipe, and heats and cools the metal pipe. According to a first aspect of the present invention, in a method of manufacturing a mold having a passage for a cooling medium, the metal pipe is formed of a multi-layered metal pipe. According to the second aspect, a through hole is formed in a metal rod or strip, and the metal pipe or the strip is joined to a predetermined shape by welding to form a metal pipe.

If the cooling pipe is composed of multiple pipes, even if the outer pipe is damaged by the molten metal, the inner pipe will not be damaged, and the intended cooling pipe will be achieved. When preparing multiple pipes (double pipes, triple pipes and higher multiple pipes, preferably double pipes), if there is a gap between the pipes, heat conduction will be reduced. It is good to make multiple tubes.

(1) Divide the outer pipe by ¼ to ¼, and weld the outer pipe with the inner pipe inserted into it to form a multiple pipe.

(2) With the inner pipe inserted into the outer pipe, the outer pipe is subjected to a drawing process to make the outer pipe thinner, and the pipes are brought into close contact with each other.

(3) Fill the gap between the outer tube and the inner tube with metal having high thermal conductivity and low melting point by using capillary action or vacuum suction. Thereafter, a drawing process is performed.

If a metal rod or strip is machined (drilled) to make a through-hole and used as a metal pipe, even if the surface is melted with molten metal, the entire thickness will not be damaged. It can be.

In order to form a cooling pipe having a predetermined shape, it is preferable to join a plurality of multiple pipes (rods (stripping) with through holes) by welding. In particular, in the case of a multiple pipe, it may be formed by bending instead of welding.

The two types of cooling pipes according to the present invention described above During injection, the cooling medium is preferably kept flowing (H e, A r, N 2, C 0, gas or water such as air) continuously, by this, to prevent erosion and thermal deformation Prevention is promoted.

After manufacturing the above two types of heating and cooling pipes according to the present invention into a predetermined shape and before setting them into a square shape, the outer surface of the pipes is provided with a mesh such as A £, Ni or Ni—P. It is preferable to form a coating layer or to coat graphite or A & powder, and such a surface treatment can control the interface between the molten metal and the pipe well and prevent erosion. This helps to prevent defective fusion.

Further, in the manufacturing method according to the second aspect of the present invention, it is preferable that after forming the through hole, the hole surface is processed (for example, screw processing) so as to increase the inner wall surface area of the hole. Therefore, the cooling efficiency can be improved when a cooling medium is flowed, which contributes to the prevention of erosion when pouring the molten metal, and at the same time, greatly improves the heating and cooling function of the metal and enhances the functionality of the mold. I can do it. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic cross-sectional view of a mold with a built-in heating / cooling pipe and a mold made by the manufacturing method according to the first embodiment of the present invention, and FIG. Fig. 3 is a schematic cross-sectional view of a mold with a built-in heating / cooling pipe and a cylic mold manufactured by a manufacturing method. FIG. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings according to embodiments of the present invention.

Example 1 (multiple tubes)

As shown in FIG. 1, a cooling pipe 10 is a multi-layered pipe composed of an outer pipe 1 and an inner pipe 2 and is arranged in a circling mold 3 having a mold-shaped cavity. The type 3 is accommodated in a cymbal frame 4.

First, the multi-layer pipe (cooling pipe) 10 is prepared by cutting the outer pipe in half, inserting the inner pipe therein, welding the outer pipe, and cutting the pipe to a predetermined length. In order to join to form a cooling passage of a predetermined shape, the cut surface is processed so as to be easily welded (for example, it is polished and finished with a hand cylinder, etc.). At the joints A and B, the inner pipes 2 are welded to each other, and then the outer pipes 1 are welded to each other so that the multiple pipe 10 is bent.

The multi-tube may be formed into a predetermined shape by bending. Next, as shown in FIG. 1, the cooling pipe 10 is set in the mold 3 and the cooling pipe 10 is arranged in the cavity. Then, the molten metal of the mold is poured into the mold cavity from the gate, and the mold 5 is mirror-fabricated by passing through the cooling pipe 10.

During cycling, a gas such as He, N ₂ , Ar, or air or a cooling medium such as cooling water is continuously introduced from the fluid inlet 7 of the inner pipe 2, and the fluid is discharged from the fluid outlet 8. By discharging, it is possible to prevent the cooling pipe 10 from being deformed or melted by the heat of the molten metal that has entered. Before setting the cooling pipe 10 to the cylindrical shape 3, the outer surface of the outer tube 1 is coated with graphite or A £ powder or melted した £, N i or N By performing surface treatment such as immersion in i-P or the like to form a paint layer, the interface state between the molten metal and the outer tube 1 during manufacturing can be controlled well, and the outer surface of the outer tube 1 can be controlled. Is melted in a molten metal, so that the mold 5 and the outer tube 1 can be completely fused, and there is no poor fusion at the boundary surface as in the conventional case.

After cooling the mold 5 thus formed, the mold 5 is separated and the mold with a built-in cooling pipe is taken out.

For example, a mold with a built-in cooling pipe is manufactured as shown in Fig. 1 under the following conditions. .

(1) Double pipe (cooling pipe)

Outer pipe: Carbon pipe for pressure piping

STPG38. Nominal diameter 15A,

(Schedule 80UIS G 3454)

Outside diameter ... 21.7 countries, Thickness ... 3.7 Lord

Inner pipe: Carbon pipe for piping

SGP nominal diameter 8 A

Outer diameter · 13.8mm, wall thickness… 2.3 ram

The outer tube is halved, the inner tube is inserted into the inner tube, and the outer tube is welded to form a double tube. The welded tube is formed into a predetermined shape, and then the A £ layer is formed by melting A ^ plating (thickness: 50). Is formed on the outer tube surface.

(2) Mold type… SKD61UIS G 4404) (3) Mold weight: 200kg

(4) The size of the mold ... 250x250 x 400 (ram)

(5) Loading temperature and loading time: 1580, 30 seconds

(6) Cooling medium for cycling… He gas

Flow rate 60 ^ min

Manufactured heating ♦ In the mold with a built-in cooling pipe, the heating and cooling pipes are arranged three-dimensionally so as to exhibit the heating or cooling effect. The quality level and mold life are greatly improved.

Furthermore, since the large and small diameter pipes are doubled in this way, even if the outer pipe is damaged by the molten metal, the inner pipe is not damaged. Since the molten metal is sufficiently fused, poor fusion does not occur at the boundary surface.

The example of the above-mentioned multiple tube is carbon, which is an iron-based metal in both the outer tube and the inner tube. However, depending on the mold material, it may be made of a non-ferrous metal having high conductivity such as Cu or copper. However, since the outer tube is in contact with the molten metal in the mold, its melting point must be equal to or higher than that of the molten metal, or high thermal conductivity.

Example 2 (in the case of forming a through hole)

As shown in FIG. 2, the cooling pipe 21 is made using a tube opened the transmural hole at drill a round bar steel, the placement of鍀物sand鐃型22 that having a die shape cavity ^Λ ΐ The type 22 is accommodated in a cymbal frame 23.

First, it comes into contact with the molten metal of the mold (鐧 Prepare a round bar (or square bar or strip) made of ferrous metal such as carbon, which has a relatively high carbon content, and drill through holes. At this time, drill holes so that the thickness of the obtained pipe is 5 to 8 mm. Then, it is cut to a predetermined length and the cut surface is processed so that it can be easily welded (for example, it is polished by a hand grinder). Instead of the long drilling operation, the metal rod may be cut to a desired length and then drilled. The cut pipes are welded at the joints C, D, E, and F to form the cooling pipes 21 in the predetermined cooling passages.

Next, as shown in FIG. 2, the cooling pipe 21 is set in the mold 22 and the cooling pipe 21 is arranged in the cavity. Then, the molten metal of the mold is injected into the mold cavity from the gate, and the mold 24 is formed by circling the cooling pipe 21.

As in the first embodiment, during manufacturing, a gas such as He, N ₂ , Ar, or air, or a cooling medium such as cooling water is continuously supplied from the fluid inlet 25 of the cooling pipe 21. By introducing the fluid and discharging the fluid through the fluid discharge port 26, it is possible to prevent the cooling pipe 1 from being deformed or damaged by the heat of the molten molten metal.

Before setting the cooling pipe 21 to the cylindrical shape 22, the outer surface of the cooling pipe 1 is coated with graphite or Ai powder, or the molten A £, Ni or N By performing surface treatment such as immersing in i-P or the like to form each of the layers, the melting and the interface state of the pipe 21 can be controlled well. The outer surface is melted with molten metal and the mold 24 and the cooling pipe 21 are completely fused and No defective fusion occurs.

After the mold 24 thus manufactured is cooled, the mold is separated and the mold with a built-in cooling pipe is taken out.

For example, a mold with a built-in cooling pipe is manufactured as shown in Fig. 2 under the following conditions.

(1) Cooling pipe

Drill a hole in a round bar with a diameter of 22 mm (S20C) and drill a 9 mm diameter through hole into a round bar (to make a 220 X 90 X lOOOOram pipe). Make the cut into a 45-degree angle The pipe is cut into a predetermined shape by welding at four places, and then an A £ layer (thickness: 50) is formed on the outer surface by melting A plating.

(2) Mold type… SKD61UIS G 4404)

(3) Mold weight: 200kg

(4) The size of the mold ... 250x 250x 400

(5) Mirroring temperature and mirroring time: 1600T: 30 seconds

(6) Cooling medium for cycling… He gas

Flow rate 70 ^ / min

In the mold with built-in cooling pipe, the thickness of the cooling pipe of the material to be covered is greater than before, so even if the surface melts, it does not melt over the entire thickness. Since the heating and cooling pipes are three-dimensionally arranged in the mold so as to exhibit heating and cooling efficiency, the effect of forced cooling of the mold is large, and the quality level of the molded product and the life of the mold Is greatly improved.

Example 3

In the cooling pipe in the second embodiment, the inner surface is Surface treatment to increase the That is, it is preferable to form a screw inside the pipe by threading after drilling the through hole. Due to such an increase in the surface area, the cooling efficiency by the cooling medium flowing into the pipe at the time of squeezing can be greatly improved, and the melting of the pipe can be more reliably prevented. In addition, the heating and cooling function of the mold is greatly improved.

For example, the cooling pipe of the second embodiment can be replaced by manufacturing the following threaded pipe.

Drill a hole in a round bar of carbon steel (S20C) with an outer diameter of 25 mm with a drill to make a through hole with a diameter of 13 mm (a pipe of 250 mm x 130 mm x 1000 mm). Then, as shown in Fig. Then, a thread is formed on the inner wall of the through hole of the pipe 31 to form a thread 32 with M 16 and a pitch of 2 nun.

This threaded pipe is cut in the same manner as in Example 2 and welded to form a cooling pipe of a predetermined shape. Then, under the same conditions as in the second embodiment, a mold with a built-in heating / cooling pipe is manufactured around the cooling pipe. Industrial applicability

As is clear from the above description, according to the present invention, the mold with a built-in heating / cooling pipe can be easily manufactured by a manufacturing method without melting the pipe that wraps around the pipe and with good adhesion between the mold and the pipe. be able to. Since the mold is forcibly cooled by flowing a heating / cooling medium through the heating / cooling pipe provided at the predetermined position, the heat in and out of the mold can be effectively controlled and removed, not only extending the life of the mold, but also It can also raise the quality level of products made with molds.

Claims

The scope of the claims

1. A metal pipe with a predetermined shape is installed at a predetermined position in a cry-shaped cavity, and a molten metal is poured into the cry-shaped cavity, and the metal pipe is wrapped and heated to produce a mold with a built-in cooling pipe. In the method

A method for manufacturing a mold (5) with a built-in heating / cooling pipe, characterized in that the metal pipe is constituted by a multiple pipe (10) of metal.

2. The outer tube (1) of the multiple tube (10) is a metal material having a melting point equal to or higher than a mold material or a metal material having a high thermal conductivity. Method.

3. The method according to claim 1, wherein a plurality of multiple pipe sections are welded and formed into the metal pipe having a predetermined shape.

4. The method according to claim 1, wherein the multi-tube (10) is bent into a predetermined shape.

5. The method according to claim 1, wherein an A ^, Ni, or Ni-P plating layer is formed on an outer surface of the metal pipe.

6. The method according to claim 1, wherein graphite or Ai powder is coated on an outer surface of the metal pipe.

7. The method according to claim 1, wherein a cooling medium is continuously supplied to the metal pipe during the injection of the molten metal.

8. Surface treatment of the metal pipe (2) so as to increase the surface area of the inner wall of the inner pipe of the multi-pipe, and a cooling medium is continuously supplied to the metal pipe (2) during the injection of the molten metal. Sink The method according to claim 1, wherein:

9. Install a metal pipe of predetermined shape at a predetermined position in the cavities of the cry mold, inject molten metal into the cavity of the 鍚 shape and wrap around the metal pipe to manufacture a mold with built-in heating and cooling pipes In the method

A method for manufacturing a mold (24) with a built-in heating / cooling pipe, characterized in that a through-hole is formed in a metal rod or strip, and the metal pipe (21) is joined by welding into a predetermined shape to form the metal pipe (21). .

10. The method according to claim 9, wherein an A, Ni, or Ni-P plating layer is formed on an outer surface of the metal pipe.

11. The method according to claim 9, wherein graphite or Ai powder is coated on an outer surface of the metal pipe.

12. The method according to claim 9, wherein a cooling medium is continuously flowed through the metal pipe during the injection of the molten metal.

13. After opening the through hole, the metal pipe (31) is subjected to a surface treatment so as to increase the inner wall surface area of the hole, and is cooled to the metal pipe (31) when the molten metal is injected. 10. The method according to claim 9, wherein the medium is continuously flowed.

14. The method according to claim 13, wherein an A £, Ni, or Ni-P plating layer is formed on an outer surface of the metal pipe.

15. The method according to claim 13, wherein the outer surface of the metal pipe is coated with graphite or A2 powder.