JPS60259305A - Composite tool and preparation thereof - Google Patents

Abstract

PURPOSE:To improve abrasion resistance and toughness by friction-welding a superhand alloy tip with a superhand-alloy supporting body which contains the larger amount of joint metal and has the larger volumn than the respectives of the tip through the metal or the alloy having a high strength in a prescribed thickness. CONSTITUTION:A joint member 3 made of the metal or alloy having a high strength such as Co, Ni, or Ni alloy is interposed in a thickness of 1mm. or less between a superhand alloy tip 1 and a superhand-alloy supporting body 2 containing the larger amount of joint metal than that of the tip 1, and the tip 1 and the supporting body 2 are friction-welded by revolving the both at a high speed. With such constitution, abrasion resistance and toughness can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to a composite tool particularly having excellent wear resistance and toughness, and a method for manufacturing the same.

・(B) Technical background When the distance between the tool holding part and the machining part is long, such as in deep hole machining, if cemented carbide is used only for the tip machining part and steel is used for the shank, the rigidity of the steel part may be insufficient. Dimensional accuracy □
The problem is that it is bad.

However, if the entire structure is made of cemented carbide, there are still problems that it will be expensive or that the shank part will not have enough strength and will break.

(C) Disclosure of the Invention The present invention attempts to eliminate the above-mentioned drawbacks by using a breakage-resistant cemented carbide, that is, a cemented carbide with a large amount of bonded metal, in the shank portion of a composite tool.

Using a cemented carbide with a large amount of bonded metal greatly increases the resistance to breakage, making it possible to use an inexpensive WC, for example, which has a slightly higher amount of impurities.

Various studies have been made based on the same idea as described above, but none of them has been able to completely solve the problems.

There is a law for manual brazing as an improvement method that anyone can consider.

Although this method is possible when the force applied to the tool is small, the joint strength is generally insufficient because the brazing area is limited.

Furthermore, in the case of metals, friction welding is used as one of the joining methods. However, in the case of cemented carbide, which is a metal, this is impossible in principle.

As a result of various studies based on the above points, the present inventors came up with the idea of sandwiching a metal or alloy plate between the cemented carbide alloys to be joined. The inventors have also discovered that an extremely preferable bond can be obtained by bonding a metal or alloy plate to the end face of the cemented carbide to be bonded in advance.

The present invention will be explained below based on the drawings.

When joining a cemented carbide chip to a cemented carbide support whose volume is larger than that of the chip, a high-strength metal is inserted between the chip 1 and the support 2 as a joining member 3, as shown in FIG. Alternatively, the chip, the support, or both may be rotated at high speed by sandwiching the joining plates. At this time, frictional heat is generated between the chip and the high-strength metal or alloy, or between the high-strength metal or alloy and the support, and the high-strength metal or alloy softens and flows, causing the joint between the chip and the support to It is possible to bond uniformly over the entire area. In addition, as shown in FIG. 2, a high-strength metal or alloy is bonded to the end face of the cemented carbide tip 1 as a bonding member 3, and the material is rubbed onto the cemented carbide support (shank) 2 in advance. It is more desirable to weld.

In this case, if the high-strength metal or alloy to be bonded to the chip and the high-strength metal or alloy to be bonded to the support (-shank) are the same, they will bond very well.

Furthermore, it is also possible to join a high-strength metal or alloy to either the tip or the support (shank), and friction weld the cemented carbide and the high-strength metal or alloy.

As the high-strength metal or alloy used as the joining member for joining the chip and the support in this invention, iron group metals or alloys containing these as main components are suitable.

Among these, Momo or NL is used as a binder phase for the cemented carbide to be joined, and is preferred because it is unlikely to cause metallurgical defects that would reduce joint strength during joining.

In particular, when N or NL gold alloy is used as a joining member, carbides such as WC and (W)C in the cemented carbide decompose during joining and react with the metal of the joining member, producing harmful composite carbides. There is little chance of phase precipitation, and extremely high-strength bonding is possible.

The thickness of the high-strength metal bonding layer as a bonding member is preferably 1 mm or less. This is because if the thickness exceeds 1 mm, the wear resistance of the high-strength metal bonding layer will be poor, which is undesirable.

Applications of the composite tool of the present invention include long end mills, drills, and punches.

This is because the present invention uses cemented carbide as the support (shank), which has much higher rigidity than those using steel, and can maintain high dimensional accuracy in these applications.

Hereinafter, the present invention will be explained in detail with reference to examples.Example 1゜On the end face of WC-5% with a diameter of 10 mm and a length of 10 mm.
mm thick NL plates were heated to 1320° C. in vacuum and joined together.

Next, a WC-15%6 alloy having a diameter of 10 mm and a length of 100 mm was sintered to obtain a sintered body having a layer mainly consisting of aluminum with a thickness of 0.2 mm at one end.

Pressure of 100 when two metal surfaces are brought together? After rotating at 3000 rpm for 2 seconds, the pressure was increased to 2500 h, and then stopped and cooled. As a result, the sintered bodies were bonded to each other over the entire surface via the Ni--Go layer with a thickness of 0.1 mm.

When the shear strength of this joined body was measured, it was found to be 85 to 9/n
It showed a high value of ++ft. Incidentally, the strength of silver brazing was 20 yen/m♂.

Example 2 (Mo, W) c-10%G alloy (TLc-30%T
L N ”) -10% (NL -1'ip ) alloy,
Alternatively, prepare chips of CraC2-10% NL alloy, heat them in vacuum as in Example 1, and give them a thickness of 1
A plate of NLSCo or Fe with a thickness of 1 mm was bonded to one end surface. These joined bodies were then joined to an alloy made of WC-25%. The bonding conditions were 1600ki and 2000 rotations/ under pressure.
After heating for 3 seconds, the pressure was set to 3000 kg.
As a result, various combinations were obtained, all of which exhibited good bonding conditions. The shear strength of these was 40 kgJ at the lowest and 75 kgJ at the highest.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams showing the configuration of a cemented carbide tip, a support body, and a joining member used to obtain a composite tool according to the present invention. ]...Cemented carbide tip 2...Support (shank)
3.3'... Joining member patent applicant Sumitomo Electric Industries Co., Ltd. Agent Patent attorney Kazu 1) Figure 1, Figure 2 Procedures Neho (self-motivated) February 26, 1985, 1988 Patent Application No. 113706 2, Name of the invention Composite tool and its manufacturing method Address 5-1, 5 Higasuyo Kitahama, Osaka City Name (2)
13) "Pressure 100kiJ" in the "Detailed explanation of the invention" column of the Sumitomo Electric Industries, Ltd. specification is corrected to "Pressure 1000IqJ.

Claims (1)

[Claims] (1) A cemented carbide chip has a larger volume than the chip, and has a bond j! A composite tool characterized in that it is friction welded to a large amount of a support made of cemented carbide through a high-strength metal or alloy having a thickness of 1 mm or less. (2 cemented carbides are WC, (Mo, W,)C, Tic, TI
The composite tool according to claim 1, characterized in that it is a sintered alloy containing any one of Cr7C2 as a main component. (3) The composite tool according to claim 1, wherein the high-strength metal or alloy is NL, Co, or an alloy thereof. (4) A high-strength metal or alloy is placed between the end face of the cemented carbide chip and the end face of the cemented carbide support, which has a larger volume than the chip and has a greater amount of bonded metal than the chip. The chips and/or the support are rotated at high speed, heated by friction with a high-strength metal or alloy, and the high-strength metal or alloy flows, causing the support and the chip to flow. A method for manufacturing a composite tool characterized by joining. (5) Cemented carbide is WC, (+' to +, W > C, πC,
T.L.N. 5. The method for manufacturing a composite tool according to claim 4, wherein the sintered base metal is composed mainly of one of Cr3 and C2. (6) The method for manufacturing a composite tool according to claim 4, wherein the high-strength metal or alloy is NL, Co, or an alloy thereof. (7) A high-strength metal or alloy is pre-bonded to the end face of a cemented carbide chip or/to the end face of a cemented carbide support that has a larger volume than the chip and has a larger amount of bonded metal than the chip. Then, the chip or the support or both are rotated at high speed to cause friction between high-strength metals or alloys or between high-strength metals or alloys and cemented carbide, heating them, and causing the high-strength metals or alloys to flow. , a method for manufacturing a composite tool in which bonding of a chip and a support is zero. (8) The cemented carbide is WCl (Mo, W)C,'Tic,
8. The method for manufacturing a composite tool according to claim 7, wherein the composite tool is a sintered alloy containing either TI or CrJC2 as a main component. (9) High strength metal or alloy is Ni', Co or C
8. The method of manufacturing a composite tool according to claim 7, wherein the composite tool is an alloy of these materials.