JPS60106629A - Electromagnetic forming device - Google Patents

Abstract

PURPOSE:To form to a formed product having good surface conditions at excellent current efficiency and working efficiency by making the surface of forming die of an electromagnetic forming device non-metallic such as ceramics, resin etc. CONSTITUTION:A work made of metal 2 is put in the forming die 3, and a solenoid coil 1 is placed in it. The work 2 is pressed against the forming die and formed by force F generated by interaction of a magnetic field generated by applying large current in the solenoid coil for a short time and induced current in the work 2. If the forming die 3 is made of metal in this case, induced current is generated in the forming die 3 to lower its current efficiency, or defects due to lowering of working efficiency and discharge traces on the surface of the work 2 etc. are caused. Occurrence of above-mentioned defects is prevented by using porcelain such as ceramics etc. as the forming die 3 or by attaching an epoxy resin containing fillers of glass fiber, silica sand etc. on the surface of the forming die 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a 7'C electromagnetic forming apparatus that improves the material of a forming die for forming a workpiece.

It is well known that electromagnetic force is used to expand, contract, and form metal tubes.
A large current flows from the energizing switch S to the solenoid coil SC.This current also flows to the workpiece A according to the principle of Tomagnetic induction.

Due to the interaction between this current and the magnetic field generated by the solenoid coil 1vSC, a radial force F acts on the two objects A. The workpiece A is formed by this radial force P'.

Next, an example of an electromagnetic forming apparatus will be described with reference to FIG.

When a current is passed through the solenoid coil 1, a magnetic field is generated between the solenoid coil 1 and the workpiece 2, and a direct current is induced in the workpiece 2. Due to the interaction between this magnetic field and ih:fM, an outward force F acts, and this outward force F pushes the workpiece 2 outward (in the direction of the mold) in the figure.
The spread workpiece 2 is molded along the mold 3.

Conventionally, metal such as steel has been used for the mold 3 due to problems such as mechanical strength. However, if metal is used for the mold, the current from the solenoid coil also flows through the mold, reducing power efficiency.

(2) When the workpiece expands, the magnetic field leaking between the mold and the workpiece is concentrated), and an inward force acts, reducing processing efficiency.

(3) When the workpiece comes into contact with the mold, the large current flowing through the workpiece or the mold flows to both sides, resulting in various drawbacks such as the appearance of radiation RL marks on the surface of the workpiece. .

The present invention aims to provide an electromagnetic forming apparatus that eliminates the drawbacks mentioned above.

In the present invention, when a mold in which a resin layer is formed by coating a metal surface with a resin such as Teflon is used in an electromagnetic forming apparatus, the resin layer insulates the mold and the workpiece. Since the mold does not come into direct contact with other metals (molding molds), the disadvantages of using only metal for the molding mold can be overcome.

In addition, if porcelain such as ceramic or Nox is used in the mold instead of metal, for example, if epoxy resin or a resin mixed with epoxy resin and filler such as glass fiber or silica sand is used in the mold, porcelain Since the resin is an insulator, there is no direct current (current flow) in the mold, which eliminates the disadvantages of using only metal in the mold.

Note that when using resin for the mold, using a resin that is a mixture of epoxy resin with fillers such as glass fiber and silica sand has better mechanical strength against impact, etc. than when using only epoxy resin.

As shown above, the electromagnetic forming apparatus of the present invention can be used to form a mold in which a resin layer is formed by coating the surface of a wire mesh, a mold made of porcelain, a mold made of a resin or a resin mixed with a filler. By using this method, there are effects such as improved power supply efficiency, improved processing efficiency, and improved surface condition of the workpiece, which is of great industrial and practical value.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of the tMi molding device, and FIG. 5g2 is an explanatory diagram of the electromagnetic molding device. So: DC source sc, i: Solenoid coil A, 2: Temporary workpiece 3: Molding mold S double energizing switch Patent applicant: Nippon Capacitor Industry Co., Ltd. Takeuchi Press Industry Co., Ltd. Figure 1 Figure 2 Figure 23

Claims (6)

[Claims] (1) A pulsed magnetic field is generated by transmitting energy from a large current source to a solenoid coil via a switch, and the electromagnetic force is used to place the coil between the coil and a mold placed around the coil. Placed workpieces such as metal k b
XX An electromagnetic forming apparatus for pre-processing is characterized in that a non-safe material is used at least on the surface of the forming mold that comes into contact with the workpiece [L-brewing forming apparatus]. (2) The electromagnetic molding apparatus according to claim 1, wherein the mold is made of porcelain or resin. (3) The electromagnetic molding apparatus according to claim 1, wherein the mold is made of metal and has a surface coated with Teflon resin. (4) The electromagnetic forming apparatus according to claim 2, wherein the porcelain is ceramic. (5) The electromagnetic forming apparatus according to claim 2, wherein the resin is an epoxy resin. (6) The electromagnetic forming apparatus according to claim 2, wherein the resin is a mixture of epoxy resin and filler such as glass fiber and silica sand.