JP2001138112A - Method of treating surface of chuck member and surface structure therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of treating a surface for minimizing the replacement frequency of a chuck member and a surface structure therewith. SOLUTION: Crushed grains 3 are formed by crushing a high-hardness member with higher hardness than that of a chuck member into the size of grains. The crushed grains 3 are thermally sprayed on the surface of the chuck member 1 together with the granulated powder 4 of binder. The crushed grains 3 are protruded from a binder layer 5 deposited on the surface of the chuck member 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating a surface of a chuck member and an improvement of a surface structure.

[0002]

2. Description of the Related Art A chuck member provided in a chuck of a machine tool, a robot hand, or the like grips a work by frictional force. Therefore, a surface that comes into contact with the work is coated with a hard material such as ceramic to reduce the surface roughness. It has been increased to obtain sufficient frictional force.

Conventionally, as this kind of chuck member, FIG.
As shown in FIG. 1, granulated powder 1 in which tungsten carbide (WC) and cobalt (Co) as a binder are each formed into a powder having a diameter of 2 to 3 μm and granulated to a diameter of 40 to 50 μm
No. 0 was formed, and the coating layer 2 was formed by spraying the granulated powder 10 onto the surface of the chuck member 1 by a powder type high-speed gas spraying method.

As shown in FIG. 7, the coating layer 2 has an uneven portion 11 having an edge peculiar to the surface formed by a powder type high-speed gas spraying method. The frictional force required for the chuck member 1 to grip the work is obtained.

[0005]

However, the concave and convex portions 1 formed on the surface of such a conventional chuck member 1 are described.
1 is a structure in which powdered tungsten carbide and a binder are mixed, so that the edge of the uneven portion 11 is rapidly worn due to the deformation and wear of the binder, and the frictional force required for gripping the work cannot be obtained. Therefore, the chuck member needs to be replaced frequently.

The present invention has been made in view of the above problems, and has as its object to provide a surface treatment method and a surface structure that can reduce the frequency of replacement of chuck members.

[0007]

The first invention is applied to a surface treatment method for a chuck member for gripping a work.

[0008] Then, pulverized particles obtained by pulverizing a high-hardness material having a higher hardness than the chuck member into particles are formed, and the pulverized particles are sprayed on the surface of the chuck member together with the binder, and the pulverized particles are welded to the surface of the chuck member. It is characterized by projecting from the binder layer.

The second invention is applied to a surface structure of a chuck member for gripping a work.

[0010] Then, a high hardness material having a higher hardness than the chuck member is pulverized into particles to form pulverized particles, a binder layer for welding the pulverized particles to the surface of the chuck member is formed, and the pulverized particles are projected from the binder layer. It is characterized by the fact that.

A third invention is characterized in that, in the second invention, a chuck body which is driven to rotate around an axis and a plurality of chuck members which are pressed against a work in conjunction with rotation of the chuck body are provided. To do.

[0012]

According to the first aspect of the present invention, a binder layer in which the crushed particles are welded to the surface of the chuck member by spraying the crushed particles formed into a suitable size together with the binder onto the surface of the chuck member. Can be projected from The chuck surface of the formed chuck member maintains the surface roughness required for gripping the work even if friction with the work repeatedly occurs, and the frequency of replacing the chuck member in a machine tool, a robot hand, or the like is reduced. Can be reduced.

According to the second aspect of the present invention, the chuck surface of the chuck member protrudes so that the crushed particles form irregularities from the binder layer, so that a reduction in surface roughness due to deformation or wear of the binder layer can be suppressed. Therefore, even if friction between the chuck surface and the workpiece repeatedly occurs, the surface roughness required for gripping the workpiece is maintained, and the frequency of replacing the chuck member in a machine tool, a robot hand, or the like can be reduced.

According to the third aspect of the present invention, when the work is automatically gripped as the chuck body starts to rotate, the chuck surface is pressed while sliding on the work. The surface roughness required for gripping is maintained, and the frequency of replacing the chuck member can be reduced.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a surface treatment method for forming a coating layer 2 on a chuck surface of a chuck member 1. As the surface treatment agent, tungsten carbide (WC) is used as a high hardness material having a higher hardness than the chuck member (base material) 1 and nickel (Ni) is used as a binder. Granulated powder 4 formed by pulverizing nickel carbide into fine powder while forming pulverized particles 3 obtained by pulverizing tungsten carbide into particles having edges.
To form Then, using a thermal spray gun (not shown), the granulated powder 4 of the binder is sprayed together with the crushed particles 3 onto the surface of the chuck member 1 while being heated to form droplets. Thereafter, facing is performed by applying only a flame from the thermal spray gun to the surface of the chuck member 1, and the binder blown by the heat is melted to form a uniform binder layer 5 on the surface of the chuck member 1.

As shown in FIG. 2, the coating layer 2 thus formed is composed of a binder layer 5 made of nickel deposited on the surface of the chuck member 1 and crushed particles 3 made of tungsten carbide deposited on the binder layer 5. Composed,
By forming the crushed particles 3 in an appropriate size, the crushed particles 3 are made to protrude from the binder layer 5.

The chuck member 1 has a surface roughness in which the crushed particles 3 protruding from the binder layer 5 have unevenness with edges, and the unevenness comes into contact with the work so as to depend on the friction coefficient of tungsten carbide. Greater frictional force is obtained.

The chuck surface of the chuck member 1 has
Are projected from the binder layer 5 so as to form irregularities, so that a decrease in surface roughness due to deformation or wear of the binder layer 5 having low hardness can be suppressed. Therefore, even if friction between the coating layer 2 and the workpiece repeatedly occurs, the surface roughness required for gripping the workpiece is maintained, and the frequency of replacing the chuck member 1 can be reduced.

FIG. 3 shows an example of a chuck device to which the present invention can be applied. The automatic chuck device 20 itself has already been proposed as Japanese Patent Application Laid-Open No. 5-57510.

The automatic chuck device 20 has three chuck members 31 formed in a cam shape so as to sandwich the work 29. The chuck members 31 are rotatably supported on the same circumference via the pins 32 at equal intervals. Each pinion 33 is coupled to the back surface of each chuck member 31, and includes a ring gear 34 that meshes with each pinion 33. The ring gear 34 rotates integrally with the chuck body 35.

When the chuck body 35 is rotated forward as indicated by the arrow in FIG.
4 rotates three pinions 33 into each chuck member 3.
The workpiece 29 is automatically gripped by rotating synchronously with the workpiece 1 and pressing the chuck surface 36 of each chuck member 31 against the workpiece 29.

When the chuck body 35 is rotated in the reverse direction, the rotation of the ring gear 34 causes the respective chuck members 31 to rotate synchronously in the direction opposite to the above-described start direction via the three pinions 33, and the chuck surface of each chuck member 31 is rotated. 36 is work 29
The gripping of the work 29 is automatically released when the work 29 is released.

However, when the work 29 is automatically gripped and released, the chuck surface 35 is pressed or separated while sliding on the work 29 while the chuck body 35 rotates several times. Wear easily.

To cope with this, the coating layer 2 is formed on the chuck surface 36 of the chuck member 31 abutting on the workpiece 29 by performing the surface treatment of the present invention shown in FIG. As shown in FIG. 2, the coating layer 2 has pulverized particles 3 made of tungsten carbide protrude from the binder layer 5.

The coating layer 2 maintains the surface roughness required for gripping the work 29 even if friction with the work 29 is repeatedly generated, and the frequency of replacing the chuck member 31 can be reduced.

As another embodiment, as shown in FIG. 4, the present invention is applied to three chuck members (jaws) facing each other.
Chuck device 40 for manually moving 41 as shown by the arrow
May be applied.

Also in this case, the work 2 of the chuck member 41
The coating layer 2 is formed on the chuck surface 42 in contact with 9 by performing the surface treatment of the present invention shown in FIG. As shown in FIG. 2, the coating layer 2 has pulverized particles 3 made of tungsten carbide protrude from the binder layer 5. Accordingly, the surface roughness required for gripping the work 29 is maintained, and the frequency of replacing the chuck member 41 can be reduced.

As another embodiment, as shown in FIG. 5, the present invention may be applied to a robot hand 50 having two chuck members 51 opposed to each other.

Also in this case, the wear of the chuck member 51 is suppressed, and the durability of the robot hand 50 can be increased.

The hard material having a higher hardness than the chuck member is not limited to a ceramic material such as tungsten carbide (WC), but may be a hard material such as diamond.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a surface treatment method according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the same coating layer.

FIG. 3 is a front view of a chuck device showing another embodiment.

FIG. 4 is a front view of a chuck device showing still another embodiment.

FIG. 5 is a front view of a robot hand according to yet another embodiment.

FIG. 6 is an explanatory diagram of a surface treatment method showing a conventional example.

FIG. 7 is a cross-sectional view of the same coating layer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chuck member 2 Coating layer 3 Pulverized grain of high hardness material 4 Granulated powder of binder 5 Binder layer

Continued on the front page (72) Inventor Shinji Kato World Trade Center Building Kayaba Industry Co., Ltd. 2-4-1 Hamamatsucho, Minato-ku, Tokyo

Claims (3)

[Claims] 1. A method for treating a surface of a chuck member for gripping a workpiece, comprising forming a crushed particle obtained by crushing a high-hardness material having a higher hardness than the chuck member into particles, and spraying the crushed particle together with a binder onto the surface of the chuck member. A method for treating a surface of a chuck member, wherein the pulverized particles are projected from a binder layer welded to the surface of the chuck member. 2. A surface structure of a chuck member for gripping a workpiece, wherein a binder layer for forming a pulverized particle obtained by pulverizing a high-hardness material having a higher hardness than the chuck member into particles and welding the pulverized particle to the surface of the chuck member is provided. A surface structure of a chuck member formed, wherein crushed particles are projected from a binder layer. 3. The chuck member according to claim 2, further comprising: a chuck body that is driven to rotate around an axis; and a plurality of chuck members that are pressed against a workpiece in conjunction with rotation of the chuck body. Surface structure.