JP2001062683A - Tool covered with diamond cluster - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve wear resistance of a tool, brought into contact with a material to be ground and relatively slid, against a material to be ground and lubricity. SOLUTION: This tool is constituted such that a material 1 to be ground formed in a circular shape in cross section is placed on and supported by a blade 2 and the outer peripheral surface of the material 1 to be ground is nipped from both sides by a grinding wheel and regulation wheels 3 and 4, rotated in the same direction as each other. By pressing the material 1 to be ground as the finding wheel 3 is rotated, grinding is executed on its outer peripheral surface as the material 1 to be ground is rotated. The upper surface 7 of the blade 2 consisting of a segment 6 formed of cemented carbide is covered by a covering layer 8, and the covering layer 8 is fixed at a metallic plating phase 9 in a state that diamond cluster 10 is dispersed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool including an abrasion-resistant tool used for receiving a pedestal and supporting a workpiece, and an electrodeposition grindstone used for cutting and grinding various workpieces. Also, the present invention relates to a tool which is brought into contact with a work material and relatively slid.

[0002]

2. Description of the Related Art A centerless grinding tool used for grinding a work material includes a blade on which a work material of a columnar shape or a cylindrical shape is placed, and a peripheral surface of the work material sandwiched from both sides. The grinding wheel and the adjusting wheel are arranged in the same direction, and the outer peripheral surface is ground by the grinding wheel while rotating the work material. It is possible to relatively move and move the work material in the axial direction using the frictional force between the workpiece and the work material. Here, there is known a blade in which a segment made of cemented carbide is arranged on the sliding surface of the work material so as to withstand sliding such as rotation of the work material or feed movement while rotating. I have.

[0003] Further, as an electrodeposition grindstone used for cutting or grinding various work materials, for example, Ni
The abrasive layer is formed by fixing super abrasive grains such as diamonds in a dispersed state in the bonding phase such as by pressing the abrasive layer against the work material while rotating the base metal,
It is known that a work material is cut or ground by super-abrasive grains such as diamond exposed from the surface of a bonded phase of an abrasive layer.

[0004]

In the centerless grinding tool having the above-mentioned structure, the blade provided with the cemented carbide segments is susceptible to abrasion due to a large friction with the work material which is fed while being rotated. However, there is a problem that the life is short. In addition, blades with cemented carbide segments have poor lubrication due to high friction with the work material, and the grinding efficiency deteriorates because the feed movement while rotating the work material is not smooth. Or the finished surface of the work material is distorted, making high-precision machining difficult.

[0005] Further, when cutting or grinding a work material using the above-mentioned electrodeposited whetstone, since the friction between the bonding phase surface of the abrasive grain layer and the chips of the work material is large, the cutting is performed. The powder is not easily discharged, and chips that are not discharged into the gaps between the abrasive grains exposed from the surface of the binder phase are likely to accumulate and cause clogging,
Exposed parts of abrasive grains decrease, cutting and grinding efficiency deteriorates,
Further, there has been a problem that as the accumulation of chips progresses, the lubricity of the work material decreases. In addition, since the friction between the surface of the binder phase of the abrasive layer and the chip of the work material is large, the friction between the chip and the binder phase causes the binder phase to be easily worn. There is a problem in that the holding power of the grains is reduced, the abrasive grains fall off, and the life of the abrasive layer is shortened.

The present invention has been made in view of the above circumstances, and has as its object to provide a tool having improved lubricity and wear resistance to a work material.

[0007]

Means for Solving the Problems In order to solve the above-mentioned problems and achieve the object, a tool of the present invention is a tool which is brought into contact with a work material and relatively slidable. A coating layer is formed on the contact surface with the cutting material, and the coating layer is characterized in that diamond clusters are fixedly dispersed in a metal plating phase.

In such a tool, since the diamond cluster is exposed from the surface of the metal plating phase at the contact portion with the workpiece, the contact area with the workpiece is smaller than that of the flat contact surface. Reduces friction with the work material when sliding relatively to the work material, preventing wear due to the work material and improving lubricity to the work material Can be done.

According to a second aspect of the present invention, there is provided a tool according to the present invention, wherein a work material is placed on a wear-resistant sliding member, and an outer peripheral surface of the work material is rotated by a grinding wheel and an adjustment wheel which rotate in the same direction. By pinching the workpiece from both sides, in a centerless grinding tool for grinding the outer peripheral surface thereof with a grinding wheel while rotating the work material, a coating layer is formed on the surface of the wear-resistant sliding member, The coating layer is characterized in that diamond clusters are fixed to the metal plating phase in a dispersed state.

[0010] In such a tool, when the work material placed on the wear-resistant sliding member is rotated or fed while being rotated, the diamond cluster forms a metal at a contact portion with the work material. Because it is exposed from the surface of the plating phase, compared to the flat metal surface of the abrasion-resistant sliding member body, the contact area with the work material can be reduced and friction can be reduced. The lubricity of the material can be improved, and the wear resistance can be improved since the material is brought into contact with the work material through the diamond cluster of high hardness.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tool according to the present invention will be described below with reference to FIGS. FIG. 1 is a cross-sectional view of a main part showing an embodiment of a centerless grinding tool of the present invention, and FIG. 2 is an enlarged cross-sectional view showing a contact portion between a work material and a blade.

A centerless grinding tool according to an embodiment of the present invention comprises, for example, a blade (abrasion-resistant sliding member) 2 on which a columnar workpiece 1 is placed, and an outer peripheral surface of the workpiece 1 on both sides. The grinding wheel 3 and the adjustment wheel 4 are arranged so as to be sandwiched between them.

The grinding and adjusting wheels 3 and 4 are both grindstones formed in a columnar shape, and are arranged so that the outer peripheral surface of the workpiece 1 is sandwiched between the outer peripheral surfaces of both wheels. Here, the rotation axis O of the grinding wheel 3 which is leveled
, The rotation axis Q of the work material 1 is set to be parallel, and the rotation axis Q is set to be higher than the rotation axis O. The rotation axis P of the adjustment wheel 4 is inclined at a predetermined angle in the vertical direction at a position parallel to the rotation axis O in the horizontal direction.

The blade 2 has a structure in which segments 6 made of, for example, cemented carbide are arranged on the upper surface of a base material 5, and the upper surface 7 of the segment 6 is inclined downward toward the adjustment wheel 4. The outer peripheral surface of the cutting material 1 is disposed so as to be sandwiched and supported by the upper surface 7 and the outer peripheral surface of the adjustment wheel 4. Here, a coating layer 8 is provided on the upper surface 7.

As shown in FIG. 2, the coating layer 8 is made of, for example, N
Diamond cluster 1 in metal plating phase 9 consisting of i
The diamond cluster 10 is exposed from the surface of the metal plating phase 9 by being fixed in a state where 0 is dispersed. Hereinafter, a method for forming the coating layer 8 will be described.

The coating layer 8 is formed using a dispersion plating technique. First, for example, a diamond cluster 10 having a particle size of 100 Å or less is suspended in a plating solution composed of a nickel sulfamate solution at a rate of 6 g / l. Here, for example, a Ni plate is immersed in the plating solution as an anode, and the blade 2 masked while leaving the upper surface 7 of the segment 6 is immersed as a cathode, and the diamond cluster 10 is uniformly dispersed by stirring the plating solution. While energizing. Then, the metal plating phase 9 is reduced and precipitated on the upper surface 7 of the cathode segment 6, and the diamond clusters 10 are co-deposited in a state of being uniformly distributed on the metal plating phase 9. The energization is continued until the metal plating phase 9 has a predetermined thickness.

The centerless grinding tool according to the present embodiment has the above-described configuration. Next, a method for grinding the outer peripheral surface of the work material 1 will be described.

The outer peripheral surface of the work material 1 is supported so as to be sandwiched by a substantially V-shaped portion formed by the upper surface 7 of the segment 6 of the blade 2 and the outer peripheral surface of the adjustment wheel 4. Here, the outer peripheral surface of the work material 1 is sandwiched between the grinding and adjusting wheels 3 and 4 from both sides, and the outer peripheral surface of the grinding wheel 3 is pressed against the work material 1 and the grinding wheel 3 is rotated to thereby rotate the work material. The outer peripheral surface of the grinding wheel 1 is ground while receiving the grinding force and being rotated in the reverse direction with respect to the grinding wheel 3.

Here, an appropriate frictional force acts between the work material 1 and the adjusting wheel 4 so that no slippage occurs between them, and the rotation axis P of the adjusting wheel 4 is 3 is tilted at a predetermined angle in the vertical direction with respect to the rotation axis O of the grinding wheel 3, and by rotating the adjustment wheel 4 in the same direction as the grinding wheel 3, the frictional force with the workpiece 1 is used to rotate the adjustment wheel 4. Can be relatively moved and moved in the direction of the rotation axis Q.

Here, since the work material 1 is placed and supported on the segment 6 of the blade 2, the work material 1 is moved while rotating while sliding on the surface of the coating layer 8 of the segment 6.

According to such a centerless grinding tool of this embodiment, the coating layer 8 is formed on the surface 7 of the segment 6 on which the work material 1 is placed, and the diamond cluster 10 is formed on the coating layer 8. Since it is exposed from the surface of the metal plating phase 9, the contact area at the time of contact with the work material 1 is reduced, friction is reduced, lubricity on the work material 1 is improved, and rotation is achieved. The feed movement is performed smoothly, and it is possible to prevent the finished surface of the work material from being distorted, thereby enabling high-precision machining. Furthermore, the high hardness diamond cluster 10 is hardly worn by the friction with the work material 1, and the wear resistance against the feed movement of the work material 1 while rotating can be improved.

Incidentally, using the centerless grinding tool according to the present embodiment, a carbide round bar (diameter 20 mm, length 200 m)
When coreless grinding was performed on the work material 1 of m),
When the blade 2 in which the diamond clusters 10 are dispersed and arranged in the metal plating phase 9 is used, compared with the case of using the blade made of a cemented carbide according to the above-described conventional technology, the hard round bar to be machined is used. The processing time for finishing the product dimensions, especially the diameter of each part within the tolerance standard, is five times longer.
The roughness including the undulation of the carbide round bar subjected to the centerless grinding with the blade 2 is 2 / compared to that of the carbide round bar subjected to the centerless grinding with the above-mentioned cemented carbide blade according to the prior art. It was 3.

In this embodiment, the wear-resistant sliding member is a member for supporting a work material in a centerless grinding tool. However, the present invention is not limited to this. You may.

[0024]

As described above, according to the tool of the first aspect of the present invention, since the diamond cluster is exposed from the surface of the metal plating phase at the portion in contact with the work material, a flat surface is obtained. The contact area with the work material is reduced as compared with the contact by the contact surface, and when the material is slid relative to the work material, the friction with the work material can be reduced. It is possible to prevent wear due to the work material and to improve lubricity to the work material.

Further, according to the tool of the present invention, when the workpiece mounted on the wear-resistant sliding member is rotated or fed while being rotated, the workpiece can be moved. Because the diamond clusters are exposed from the surface of the metal plating phase in the contact area, the contact area with the work material is reduced by reducing the contact area with the work material compared to the flat metal surface of the wear-resistant sliding member body. It is possible to reduce the size, improve the lubricity of the work material, and improve the wear resistance because the work material is brought into contact with the work material through a diamond cluster having high hardness.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a centerless grinding tool according to a tool according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a contact portion between a work material and a blade in the centerless grinding tool shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Work material 2 Blade 3 Grinding wheel 4 Adjusting wheel 8 Coating layer 9 Metal plating phase 10 Diamond cluster

Claims (2)

[Claims] 1. A tool which is brought into contact with a work material and slid relatively to the work material, wherein a coating layer is formed on a contact surface with the work material. A tool wherein clusters are fixed in a dispersed state. 2. A work material is placed on a wear-resistant sliding member, and the outer peripheral surface of the work material is sandwiched from both sides by a grinding wheel and an adjustment wheel that rotate in the same direction as each other, thereby forming the work material. In a centerless grinding tool for grinding an outer peripheral surface by a grinding wheel while rotating a work material, a coating layer is formed on a surface of the wear-resistant sliding member, and the coating layer includes a diamond cluster in a metal plating phase. A coreless grinding tool characterized in that the particles are fixed in a dispersed state.