JPS6123528A - Method and tool for working ironing - Google Patents

Abstract

PURPOSE:To prolong the tool life and to elevate the product accuracy as well by using a ceramic material on one part of both parts of a die and punch. CONSTITUTION:An ironing work is performed between the inner face 2a of a die 2 and the outer face 3a of a punch 3 with piercing the metallic blank material 1 which is surface-treated by melamine resin, etc. In this case one part or both parts of the tool for working consisting of the die 2 and punch 3 is made of the ceramics of high intensity zirconia, etc. The abrasion resistance of the die 2 and punch 3 is remarkably elevated with this method and the generation of seizure and thermal generation at working time can be prevented. Consequently the working accuracy of products is elevated as well as the prolongation of a metal die life.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method of ironing a metal material that has been surface-treated with a melamine resin or the like, and a tool used therein.

[Prior art]

Plate fins for heat exchangers have conventionally been generally made of pure aluminum, which is ironed (cold worked) to become thin and hard.

FIG. 1(a)(1)) shows an example of the ironing process disclosed in Patent No. 1117009 filed by this applicant, in which a perforated material 1 generally made of pure aluminum is placed in a die 2. The ironing process is performed between the inner surface 2a of the die 2 and the outer surface 6a of the punch 6 by the punch B.

Conventionally, pure aluminum material without surface treatment is used as material 1, and in this case, die 2 and e-edge 3 are used.
For example, the material is S K H-9 or 5KD.
-11 (JIs) and other Yoyo steel products are used.
This function was sufficient.

However, in recent years in the air conditioning industry, the surface of the pure aluminum material has been treated with melamine resin or silicone resin, etc., in order to improve the thermal efficiency of heat exchangers and the corrosion resistance of plate fins. In this state, there has been a shift towards ironing using this material.

When a pure aluminum material subjected to such a surface treatment is ironed using the steel die 2 and punch 3 as described above, the surface treatment agent may peel off, causing seizure of the die and punch. The disadvantages are that the product cannot be processed or the life of the mold (die, punch) is greatly reduced due to wear and the like.

Therefore, it has been desired to develop an ironing method and a tool used therein that can overcome this drawback.

[Purpose of the invention]

An object of the present invention is to overcome the above-mentioned conventional drawbacks and to prevent tool seizure and wear during ironing of surface-treated metal materials by using ceramic materials for dies and punches as tools for ironing. An object of the present invention is to provide an ironing processing method and a tool used therein that can avoid the occurrence of ironing.

[Structure of the invention]

That is, the present invention provides a method for ironing a surface-treated material using a tool consisting of a die and a chimish, in which ironing is performed using a ceramic material for one or both of the die and the punch. It is a characteristic ironing processing method,
The present invention is also a tool for ironing a surface-treated material, characterized in that one or both of the die and the /ξ mince constituting the tool are made of a ceramic material.

〔Example〕

As explained above with reference to FIG. 1, the processing method of the present invention is as follows: a perforated material 1, which is generally made of pure aluminum and whose surface has been treated with melamine resin or silicone resin, is brought into contact with a die 2, and a punch 6 is used to Ironing is performed between the inner surface 2a of the die 2 and the outer surface 6a of the punch 6. The ironing tool consisting of the die 2 and punch 3 used in the present invention is made of ceramics such as high-strength zirconia (Z r 02 ). By using this tool, the wear resistance of the die 2 and punch 6 is significantly improved, and seizure and heat generation during machining can be prevented. Therefore, it is possible to extend the life of the mold and improve the accuracy of the processed product. Although the above example generally describes the processing of a material made of pure aluminum, it is possible to extend the life of the mold and improve the precision of the processed product. The present invention is also effective in this case. Depending on the cutting conditions, it is also effective to construct either the goose, the spout, or the splice from a ceramic material, and use a conventional steel tool for the front.

In actual work, conventional steel tools have approximately 300.0
Seizing occurred after 00 shots, requiring tool maintenance and replacement, but with the present invention, seizing was not observed even after 4,000,000 shots. As explained above, according to the present invention, by using a ceramic tool when ironing a surface-treated metal material, the wear resistance of the tool is improved, and the occurrence of seizure and heat generation during machining can be improved. This has made it possible to improve the tool life and the precision of punched products.

[Brief explanation of drawings]

Figures 1 (al, b) are process explanatory diagrams of general ironing processing. 1...Material 2...Dice 3...
ξinch% Applicant Hidaka Seiki Co., Ltd. a (a) 1st (b) Figure

Claims (2)

[Claims] 1. An ironing method for ironing a surface-treated material using a tool consisting of a die and a punch, characterized in that the ironing process is carried out using a ceramic material for one or both of the die and the punch. . 2. A tool for ironing a surface-treated material, characterized in that one or both of a die and a punch constituting the tool are made of ceramic material.