Kusunoki Dieholder

Our die holders

The only on-demand die holders in Japan

Top quality, fast delivery, and high technological standard

Taking advantage of the benefit of our parent company also being our client, we collect customer information and take part in active exchange of opinions on forging technology, the results of which we apply in our design.
In the forging industry, the Kusunoki name has become the symbol of “die holders for hot forging press.” As “the only on-demand die holder manufacturer in Japan,” Kusunoki Dieholder has achieved high quality and fast delivery, boasting a top-class technological level.

Certified “Aichi brand company”
Aichi brand company certification number 614

developed for the first time in Japan in 1982 have contributed to shortening the time for die replacement in the forging press, saving power, labor, and space, and dramatic improvement in safety, thus revolutionizing the industry. They are now installed on over 150 lines in Japan and overseas.We also offer automatic transfer equipment such as incidental die replacement equipment and material supply equipment, contributing to the stable supply of forged products. In recognition of these achievements, we were certified as an “Aichi brand company” in 2010.

The Kusunoki die holdersKUSUNOKI DIE HOLDER

Die holders do not only fix the die to the press machine but also act as guides to accurately move the die up and down, enhancing manufacturing accuracy.Also, dies are very heavy and cannot be easily lifted by hand to attach to the press. Moreover, dies need to be replaced every time a different product is made.Therefore, to manufacture various kinds of products quickly, it is important to be able to exchange the dies quickly.
As a result, attaching the die to a die holder outside the press and setting it on the press together with the die holder has become mainstream.Taking such limitations into consideration, our die holders satisfy the following conditions.

1.The concentricity of the upper and lower dies is accurate
2.The dies must be precisely and strongly fixed
3.The dies can be replaced quickly

We will manufacture a die holder that is pleasing to our customers

A variety of die holders are required by customers. In order to manufacture a die holder that is pleasing to customers, technology is important, but of course we think communication with customers is the first.
We are a manufacturer of development and design, we are proud to be able to produce great facilities together with our customers.

HPC die holders

Kusunoki Die Holder developed a revolutionary die change-type die holder.
It is the “Hard Plate Changer die holder” or for short, the “HPC die holder”

HPC die holders

Address the weaknesses of traditional die replacing methods by taking advantage of their strengths

Conventional die changing

When removing the die from the press machine, we remove not only the die but also the plate laid to prevent wear of the die holder body (aka hard plate). By removing the top and bottom dies at the same time, the die is “sandwiched” between hard plates. We call this state of the die and hard plates a “cassette”. We replace the cassette leaving the die holder inside the press machine. Moreover, a mechanism for fixing the cassette by hydraulic pressure is built inside the die holder. This eliminates the need for the extremely dangerous, dirty and effort-consuming work of detaching the die with bolts inside the press. It makes fixing the die safely and easily by a simple button operation possible.

Also, since cassettes are lighter and smaller than conventional die holders, they do not require large-scale like a die holder replacement machine, and cassette handling can be carried out from a simple push car. There is also no need to secure a wide area for cassette storage such as required for a die holder. Inversion of a cassette upper die can also be done more easily than for a die holder upper die, with no dangerous operation involved.

Characteristics of HPC die holder
  • 1.It eliminates the need to do dirty hard labor with danger in the press.
  • 2.The cassette carrying carriage is small and requires less installation space.
  • 3.The die replacement time can be greatly shortened, and the operation rate of the press is increased.

We were able to establish these merits at the same time.

About conventional die replacement methods (setups)

Traditionally, there were two ways of replacing a die already forged with a die to be forged.

1.Replace the die only (in-line setup)

This method implies reaching inside the press machine to replace the attached die by hand or by using a tool such as a die replacement arm. If the die is light enough to be removed by hands, this is the quickest method of replacement. However, as the operation is done inside the press machine, it is dirty, difficult and it involves great danger.

2.Replace the die and die holder together (off-line setup)

When the die is so heavy that it cannot be moved by hand or to avoid performing dangerous operations, this method allows removal of the die from the press machine together with the die holder to which it is attached.As dies are replaced outside the press machine, this is called external or “off-line setup.”
To shorten replacement time, and to attach the next die to be forged, you need to prepare another die holder in advance and to replace the die holder and die as a set immediately after completion of forging.
As the die holders can weigh several tons, die holder replacement equipment should be placed near the press machine. This replacement method is called QDC (Quick Die Change) and the replacement equipment is called a QDC device.

After taking it out of the press machine, the die holder is reversed to open it, and the die attached to the die holder is replaced, so the operation is very safe. However, since the die holder is very large, the die holder replacing device also needs to be big, and to store the removed die holders, it is necessary to secure a wide space.