JPS6249857B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite material for tools that has excellent vibration damping properties, and more particularly to a composite material for tools that has a laminated structure and has excellent vibration damping properties.

In recent years, legal regulations regarding factory noise and vibration have become stricter, and how to suppress the noise and vibration generated when cutting or processing hard materials such as metal or stone has become a major issue. A composite vibration-damping steel plate in which a resin is sandwiched between steel plates is well known as a material that has a vibration-damping effect. However, tool steel used for cutting and processing metals and stones heats up during use, constantly uses cutting oil and water, and requires the sharpness of a tool steel. was considered unsuitable.

An object of the present invention is to provide a composite material for tools that has excellent vibration damping properties without impairing its original function as a tool steel even under the above-mentioned severe usage conditions.

The above objects of the present invention are achieved by the following two inventions.

The gist of the first invention is as follows. That is, it is a composite material for tools with excellent vibration damping properties, which is made up of a laminate of a plurality of tool steels and is integrated by spot welding or seam welding.

The gist of the second invention is as follows. That is, it is a composite material for tools with excellent vibration damping properties, which is made up of a laminate of a plurality of tool steels and a metal to be clamped, and is integrated by spot welding or seam welding.

The present invention uses tool steel as a composite laminate to structurally provide vibration damping properties, and further uses other tool steels or vibration damping alloys as the clamping material, so that the tool can be used even under the severe operating conditions described above. It has vibration damping properties without impairing the original functions of steel, and is manufactured into an integrated laminate using a relatively simple method such as spot welding or seam welding.

The details of the invention are illustrated by the following various examples.

Example 1 Figure 1 shows a cutting tool with a length of 150 mm, and the plate thickness
A 2 mm thick tool steel 2B is sandwiched between a 10 mm tool steel 2A and integrated by spot welding, and the two are welded at five spot weld points 4. Various tests were conducted on this cutting tool, and it was found that the noise during cutting was lower than that of conventional cutting tools with a single structure, and the effectiveness of vibration damping was recognized. In addition, the sharpness was comparable to that of conventional single-structure tools, and no peeling or cracking between the tool steels was observed.

Example 2 This example is a band saw as shown in FIG. 2A,
As shown in an enlarged view in FIG. 2B, a 0.8 mm thick tool steel 2 is sandwiched with a 0.5 mm thick Cu-based material 6 having vibration damping properties and integrated by spot welding.

A strip-shaped test piece was cut from this band saw, and its vibration was investigated using the mechanical impedance method. The loss coefficient was approximately 0.05 at 20°C, and the loss coefficient was approximately 0.05 at 20°C.
It is several tens of times higher than 0.001, which shows that the damping properties are excellent. Furthermore, when cutting steel materials with this band saw, noise was reduced and the working environment was significantly improved, and its lifespan was comparable to that of conventional single-structure band saws.

Example 3 This example uses a circular saw with a diameter of 1200 mm as shown in Figure 3.
As shown in the enlarged view of Fig. 3B, a 2.0 mm thick tool steel 2 processed to 2.0 mm is inserted into a 0.5 mm thick Cu-based material 6 with vibration damping properties and made into an integral structure by seam welding. . In FIG. 3A, the center circle is the attachment hole 8, and the two circles outside it are the seam weld lines 10.

Example 2 A strip-shaped test piece was cut out using a circular saw.
When the vibration was investigated in the same manner as above, it was found that the loss coefficient was similar to 0.05 at 20℃, indicating excellent vibration damping properties. When cutting wood into rounds using this circular saw, the metal noise emitted during cutting was reduced compared to conventional methods, and the working environment was significantly improved. Note that the life of the circular saw of this example was almost the same as that of a conventional single material, and there were no problems.

Example 4 This example relates to a cemented carbide tool bit for machining extremely hard materials. As shown in Fig. 4, a tool steel 2 with a length of 150 mm and a thickness of 10 mm is sandwiched with a Cu-based material 6 with a thickness of 0.5 mm that has damping properties, and is integrated by spot welding to form a laminated body. A cemented carbide 12 with a length of 30 mm was attached.

Compared to conventional cemented carbide tools, this cemented carbide tool with a composite layer has the same sharpness and reduced vibration and noise during cutting.

Example 5 This example is also a circular saw, but the cutting edge part is made only of tool steel, and only the middle part is sandwiched with damping metal. That is, as shown in Fig. 5, a tool steel 2 with a diameter of 1200 mm and a thickness of 2.0 mm is used, and a Cu-based material 6 with a slightly smaller diameter and 0.5 mm thick with vibration damping properties is used.
After making it into an integral laminate by sandwiching and seam welding,
In FIG. 5, in which the cutting edge part has been induction hardened, the shaded part is the part of the laminate in which the Cu-based material 6 is sandwiched, and the outer cutting edge part is not sandwiched.

Although this example does not have a damping metal attached to the cutting edge, noise and vibration during cutting were reduced. Additionally, the cutting edge can be re-sharpened, ensuring good sharpness and vibration damping properties at all times.

As is clear from the many embodiments described above, the present invention provides vibration damping by integrating a plurality of tool steels or a plurality of tool steels sandwiching other metals into a laminate by spot welding or seam welding. It became possible to obtain a composite material for tools with excellent properties, and the effect of reducing noise and vibration during tool use was achieved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a cutting tool according to an embodiment of the present invention, FIG. 2A is a perspective view showing a band saw according to an embodiment of the present invention, FIG. 2B is an enlarged perspective view of a part of A, and FIG. 3A
is a plan view showing a circular saw according to an embodiment of the present invention, FIG. 3B is an enlarged perspective view of a part of A, FIG. 4 is a perspective view showing a cemented carbide cutting tool according to an embodiment of the present invention, and FIG. FIG. 7 is a plan view showing a circular saw according to another embodiment of the invention. 2, 2A, 2B...Tool steel, 4...Spot welding point, 6...Cu-based material, 8...Mounting hole, 1
0...Seam weld line, 12...Cemented carbide.

Claims (1)

[Scope of Claims] 1. A composite material for tools with excellent vibration damping properties, which is made of a laminate of a plurality of tool steels and is integrated by spot welding or seam welding. 2. A composite material for tools with excellent vibration damping properties, which is made of a laminate of a plurality of tool steels and a metal to be clamped, and is integrated by spot welding or seam welding.