JPS5919528Y2 - Underwater extrusion equipment for indirect extrusion molding - Google Patents

Description

[Detailed description of the invention] In the extrusion molding of rod-shaped materials, indirect extrusion molding has the advantage of not involving impurities around the billet periphery or requiring less extrusion force, but the indirect extruder has a long die stem. There were no specific inventions or ideas regarding effective oxidation prevention methods for molded products.

This invention prevents oxidation of molded products during indirect extrusion molding, and enables indirect extrusion molding of copper alloys such as brass. The guide pipe is inserted into the inside of the die stem so as to form a closed gap that communicates with the hollow part of the guide pipe, and communicates with the closed gap so as to be able to shut off a non-oxidizing gas source, and is also aligned with the die stem in an airtight manner. A cooling water pipe that can be connected and communicates with a cooling water tank is provided with a nozzle for forming a jet curtain of pressurized water in the wood pipe at the end on the die stem side, and the nozzle and a pressure water source are communicated so as to be able to be cut off. This relates to an underwater extrusion device for extrusion molding.

Embodiments of the present invention will be described below with reference to the drawings.

1 is a container, 2 is a die stem, and 3 is a counterplant.

A die 4 having a predetermined extrusion hole is attached to the tip of the die stem 2, and the base 5 of the die stem 2 has a funnel-shaped large diameter, and the base 5 is held in a sandwich shape by a holder 6 and a holding block 7. The holder 6, presser block 7, and die stem 2 are integrated into one body.

In addition, a guide pipe 8 having a diameter smaller than the inner diameter of the hollow part is inserted into the hollow part of the die stem 2 concentrically with the die stem 2, and the flange 9 attached to the base of the guide pipe 8 is airtightly attached to the die stem 2. A cylindrical non-oxidizing gas flow path 11 is formed between the die stem 2 and the guide pipe 8, and the molded product path 10 and the gas flow path 11 are connected to the tip of the guide pipe 8, The gap between 44 provides communication.

Further, the gas flow path 11 and a non-oxidizing gas source (not shown) communicate with each other through a communication port 12 so as to be able to be shut off.

The holder 6 and the presser block 7 are dropped into a recess provided in the die slide 13, and are prevented from falling off by a horseshoe-shaped presser plate 14.

Further, the die slide 13 is fitted into a pair of upper and lower die slide guides 15 attached to the counter platoon 3 via a liner 16, so that the die slide 13 can be slid in a direction perpendicular to the plane of the paper.

Further, a hole 17 is made in the counter platen 3 so as to coincide with the center of the die stem 2, and a block 18 is embedded in the hole 17 so as to be in close contact with the holder 6.

The tip of the cooling water pipe 19 is watertightly fitted into the hole 17 and fixed to the counter platen 3 via the flange 20,
The base is watertightly inserted into a cooling water tank 21 equipped with a water level holding device.

The cooling water pipe 19 is a double pipe with an appropriate length on the die stem side, and a cylindrical space 22 formed in the double pipe part is made watertight and communicates between the space 22 and a pressure water source (not shown) via a nipple 23. Furthermore, a required number of nozzle ports 25 are formed near the tip of the inner wall 24, the nozzle ports 25 being inclined in the direction opposite to the die stem.

Next, the operation of the above device will be explained.

Pressure water is ejected from the nozzle port 25, and after forming a jet curtain with the ejected water, the cooling water in the water tank 21 is allowed to enter the cooling water pipe 19.

Although the cooling water fills the inside of the cooling water pipe 19, it is blocked by the jet curtain and does not leak to the die stem 2 side.

Also, non-oxidizing gas at a pressure slightly higher than atmospheric pressure is flowed through the communication port 12 to fill the inside of the die stem 2 with the non-oxidizing gas.

In this state, the container 1 loaded with billets is moved to the die stem 2 side.

The die 4 eventually comes into contact with the billet and extrusion begins, and a molded product is extruded from the extrusion hole of the die 4, but the molded product is covered with non-oxidizing gas and does not come into contact with the atmosphere.

The molded product passes through the die stem 2, enters the cooling water filling the cooling water pipe 19, and reaches the water tank 21.

When the end of the molded product falls out and enters the cooling water tank 21, the flow of non-oxidizing gas is stopped.

Therefore, the molded product is not exposed to the atmosphere from its beginning to its end, and oxidation can be prevented.

When extrusion molding is performed, metal powder remains inside the container 1 and must be cleaned.

Therefore, the die stem 2 is the counter platon 3 as mentioned above.
It is supported by a die slide guide 15 so that it can be moved in a direction perpendicular to the plane of the drawing, and when replacement is required, it can be moved and then removed upward in the drawing.

As described above, the present invention enables underwater extrusion in indirect extrusion molding, and enables indirect extrusion molding of copper and copper alloys.

[Brief explanation of drawings]

The drawing is an explanatory view of the vicinity of the die stem nozzle of the device according to the present invention. 2 is a die stem, 8 is a guide pipe, 10 is a molded article passage, 11 is a non-oxidizing gas passage, 19 is a cooling water pipe, and 21 is a cooling water tank.

Claims (1)

[Scope of utility model registration request] A hollow guide pipe is inserted into the die stem so that a closed gap communicating with the hollow part of the guide pipe is formed at the tip of the hollow guide pipe around the outer circumference of the guide pipe, and the non-oxidizing gas source can be cut off into the closed gap. A nozzle for forming a jet curtain of pressurized water in the water pipe is provided at the die stem side end of the cooling water pipe which is coaxial with the die stem and can be airtightly connected and communicates with the cooling water tank. An underwater extrusion device for indirect extrusion molding, characterized in that it communicates with a pressure water source in a manner that can be shut off.