JPS60141406A - Peeling die - Google Patents

Abstract

PURPOSE:To sharply improve wear resistance by forming a hard coating layer having bad affinity to workpiece metal on the surface of a die tip by chemical vapor deposition. CONSTITUTION:A hard coating layer having bad affinity to workpiece metal is formed on the surface coating layer of the tip of a die snap by chemical vapor deposition of at least any one of carbide, nitride, boride, charbon/nitrogen compound, nitorgen/boron compound, cabonate compound, exygen/nitrogen compound, aluminium oxide belonging to 4a, 5a, or 6a groups of periodic table, or their combination. The chemical vapor deposition is effected for example under the atmosphere of reduced pressure less than 100Torr and in the temperature range from 900-1,030 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to a peeling die, and particularly to a peeling die that has the same seizure resistance and wear resistance as well as extends the life of the die.

(b) Prior Art and Problems A stripping die is well known as a die for pulling wire rods, bars, etc. and stripping the surface of the material.As shown in Figs. It is made of steel or cemented carbide and is designed to withstand severe peeling. However, conventionally known peeling dies form a built-up cutting edge 3 at the tip of the cutting edge 2 in a relatively short period of time, resulting in an increase in cutting resistance, dimensional changes and surface roughness of the workpiece, and, for example, l-coil peeling. When removed, it usually became unusable.

For this reason, the seizure resistance of the peeling die has been improved, and the built-up cutting edge 3
It was desired to prevent the formation of still,
4 in the figure indicates chips.

(c) Purpose The present invention was made with a focus on conventional stripping dies, which have a relatively short lifespan, and by chemical vapor deposition of the die coating, a hard coating layer is formed on the surface of the die, which has a high affinity with the stripped metal. The object of the present invention is to provide a peeling die that does not produce a built-up edge and can significantly improve wear resistance.

In order to achieve the above-mentioned purpose, the peeling die according to the present invention has a structure in which the cutting edge of the die tip has the structure 4a of the periodic table of elements.
, at least one of carbides, nitrides, borides, carbonitrides, carbon borides, boron nitrides, carbonates, oxynitrides, aluminum oxides, or aluminum oxynitrides of Group 5g or 6a, or a combination thereof. The gist is that the coating layer is also chemically vapor deposited to form a hard nucleation layer on the surface that has poor affinity with the metal of the workpiece.

(e) Examples The detailed MJl of the present invention will be explained below with reference to FIG.

Incidentally, parts common to the conventional one are indicated by the same reference numerals, and redundant explanation will be omitted.

In this invention, first, a hard coating of aMB is formed on the entire surface of the die 2'1 of the peeling die and on the cutting edge 2 by chemical vapor deposition.

The material of the hard layer 5 includes carbides, nitrides, borides, carbonitrides, and carbons of groups 4a, 5a, or 6a of the periodic table of elements that have poor compatibility with workpiece metals such as iron and titanium. Boride, boride, carbonate, oxynitride, aluminum oxide,
or at least one of aluminum alloys or a combination thereof, especially titanium, zirconium, hafnium, chromium carbides, nitrides, carbonitrides, alumina oxides, carbonitrides, etc. is preferred.

As mentioned above, chemical vapor deposition is used to form the hard nucleation layer 5, and for example, the step 1 is performed under extremely reduced pressure (
For example, T i O+4+H2 (less than l 00 Torr)
+OH4 or T to 14+H2+N* atmosphere, temperature range from 900 to 1030℃, chemical vapor deposition for several hours can produce sieving titanium carcasses, hard nitrides with a flatness of less than %011S. The nucleation layer 5 can be formed thereon.

Chemical vapor deposition technology itself is similar to other thermal decomposition methods, hydrogen decomposition methods,
Since this method is generally known as the OVD method along with the substitution reaction method, etc., a detailed explanation of the chemical vapor deposition itself will be omitted here. By the way, it is generally known that chemical vapor deposition improves the wear resistance of the base material.

However, there are problems such as surface roughness, easy peeling of the nucleation layer, dimensional changes, and difficulty in reprocessing, and the close relationship between the peeling die and the metal to be processed can endanger the life of the die. Because it was not noticed that this was a major factor in determining comb dies, there were no known cases of chemical vapor deposition of ash% crabmide, etc. on peeling dies, and it was thought that there was little merit in chemical vapor deposition on comb dies. is humorous. Therefore, the inventors of the present invention dared to apply chemical vapor deposition to the peeling die, and as a result of repeating the unfortunate experience, they applied a special pretreatment to step 1 of the die, and then applied chemical vapor deposition with a high MW to the peeling die. By doing this, we created a peeling die with a hard coating M5 that has low adhesion, high dimensional accuracy, and finish that requires almost no processing, and has a poor affinity with the metal to be processed. The thickness of such a hard enucleation layer 5 is approximately 10 microns at most, and it is not necessary to form the hard enucleation layer 5. ing.

For example, depending on the quality of the base material of the die chip 1, if an η layer (Oo, W2C, brittle layer) is formed on the ascending surface of the hard plate a layer 5 and the mother plate, the amount of wear and chipping will increase. In order to reduce the amount of four layers of carbon, it was found that it is preferable to make the base material of die step 1 a high carbon alloy (6.14% C or more). On the other hand, as the hard nucleation layer 5, the chipping resistance can be improved by chemically depositing Tm0 to an extremely thin layer, for example, 2 to 4 microns by chemical vapor deposition. ] It was possible to stop the formation of a built-up cutting edge by β) without any damage, and to significantly improve the wear resistance.

By the way, the hard υν horizontal layer 5 can be chemically vapor deposited as a compound JiVi', and when the base material of the die tip 1 is made of cemented carbide, a hard layer of Ti01.5μ is formed on the cutting edge 2, When I applied 4 layers of TiN 1.5μ I+', 1!11 coat and 1〆 coat to the nest, I found that TiN has anti-seizure properties and (j
11 Effective in preventing the formation of a grown cutting edge 3.

Even if this riN layer wears out, the '11' i 0 layer underneath it (He shell) sufficiently protects the cutting edge 2 and the h of the die.
It can be confirmed that life can be greatly extended fr:,
.

(f) Effects The peeling die according to the present invention has an 811. By forming an incompatible hard coating layer, it is expected that the formation of the tJ4 cutting edge will be prevented and the l111 abrasion resistance will be further improved. Experiments by the gods have confirmed that their lifespans are 4 to 10 times longer. When forming such a hard coating layer, in order to avoid the generation of η)H at the interface between the hard coating layer and the matrix of the die chip, a high carbon alloy is used as the matrix of the die chip, and titanium carbide is used as the matrix of the die chip. A・! If IL < thin chemical vapor deposition, a peeling die with a very long life can be obtained.

[Brief explanation of the drawing]

Figure 1 is a vertical view of the die tip of a conventional peeling die, Figure 2 is an enlarged sectional view of the section indicated by the arrow 8 in Figure 1, and Figure 3 is a hard coating layer formed on the cutting edge. FIG. 2 is an enlarged sectional view corresponding to FIG. 2 showing the die tip of the peeling die according to the present invention. 1...Dice tip 2...Blade tip 3...Constructed cutting edge 4...Chip 5...Hard core layer

Claims (2)

[Claims] (1) 411 of the periodic table of elements is placed on the cutting edge of the die tip.
At least one of carbides, nitrides, borides, carbonitrides, carbon borides, boron nitrides, carbonates, oxynitrides, aluminum oxides, or aluminum oxynitrides of Group 5a or 6a, or They are combined and chemically vapor deposited into multiple layers.
A peeling die characterized by having a hard coating layer formed on the surface that has poor affinity with the metal of the workpiece. (2) The stripping die according to claim 1, wherein the die tip is made of a high carbon alloy and has a cutting edge thereof coated with a titanium carbide of 2 to 4 microns by chemical vapor deposition.