Business of KYORITSU

We manufacture transmission and suspension parts for automobiles.

As you know, sufficient rigidity is required for such parts, and most of the parts are manufactured using metal. Therefore, we can say that the major business of KYORITSU is "Metal Processing".

KYORITSU assures quality of our parts by performing Various tests, such as rigidity tests, durability tests, and stress measurement in our own lab.

Most of our parts are now delivered to Mitsubishi Motors Corporation, however, our future plan is to complete world-wide and supply parts to world-famous car makers and machine makers.

Metal Processing

You may have an image of metal as being hard and rigid.

Of course it is hard and rigid, however, it can be cut, ground, bent, stretched, and combined by melting.

These operations are called "Metal Processing".

Following are the major methods of metal processing.

  1. Cutting and Grinding
    Cut and grind unnecessary portions to form necessary shapes.
  2. Casting
    Pour molten metal into molds to form parts.
  3. Forming
    Bend, punch, and stretch to form necessary shapes.
  4. Welding
    Combine several parts to create a required structure.

Parts are manufactured through a combination of processes using following methods.

Processing performed by KYORITSU

  1. Cutting and Grinding
  2. Forming
    Cold forming, Cold forging, stamping
  3. Welding
    CO2 arc welding, plasma arc welding, projection welding, up-set butt welding, etc.

In addition to the above, we are capable for most heat treatment and assembling processes.

Especially, our expertise in cold forming is world-class. No other company in the world can match our performance.

Some reasons for our confidence follow. Here is some evidence to support our confidence.

What is Cold forming?

One property of metal is that it will not maintain its original shape once it is formed by applying more than certain pressure.

At the same time, another property is that its processing will be easy when heated up.
(3) Forming is the process which utilizes these properties.

Among the processes of forming, the method to form metal by stamping is called "Forging".

There are roughly three main methods of forging.

  1. Hot forging with the material heated to about 1200℃.
  2. Warm forging with the material heated to about 450℃.
  3. Cold forging with the material not heated up at all before stamping.

The cold forging process that KYORITSU performs is a continuous stamping operation using a machine called a Parts Former.

Coil Steel is the type of material used. The material is fitted in the mold called Cold Forging Mold to deform the metal.

Among the types of cold forging, this process is called Cold forming.

Advantages of cold forming

As mentioned above, metal can be processed easily when it is heated up.

However, KYORITSU has innovated with the use of cold forming.

The reason for this is; cold forming has some advantages which are not seen with cutting, grinding, hot forging, or warm forging.

  1. It is easy to achieve a near-perfect shape. Therefore, additional grinding and scrapping are not needed.
  2. Facilities and energy to heat up metal are not needed.
  3. Cold formed parts are rigid.
    • No breakage of metal flow.
    • Forming without heating will accelerate the curing so the parts will be hard and rigid.
  4. The time needed for processing is a lot shorter than for grinding.
  5. Parts can be mass-produced.

These are the advantages of cold forging.

We make every efforts to make quality, low cost parts in a timely manner.

Our customers demand high-quality, low-price, and short lead-time parts.

The price of parts is determined by the production cost (expenses). For instance, the volume of material, number of processes, and time needed to complete the processes are the key factor determining the cost.

Needless to say, in addition to delivering quality parts, we are able to satisfy our customer's need for short delivery time if the processing time is short and the number of processes is few.

It is very important for us to make parts which are as near the target shape as possible with only one processing.

This is called "Near Net Shaping"istandard finishing shapej.

In terms of that, cold forming is a very effective means of production. KYORITSU's target is to skip all processes after the near net shaping through continuous efforts to enhance the forming accuracy.

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