JP2887657B2 - Manufacturing method of collet chuck - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a collet chuck to be mounted on a machine tool such as a lathe, and more particularly to a method of forming an opening of the collet chuck.

[0002]

2. Description of the Related Art In the conventional turning process of a collet chuck, the main body is machined in a shape obtained when the main body is grasped.
After slitting, an opening margin was provided by opening each of the divided parts, and then heat treatment was performed.

[0003]

In the conventional method, since the turning is performed in the shape at the time of grasping the main body, a slit is formed to provide an opening margin, and then a quenching process is performed. It is impossible to maintain a stable shape.

[0004] Further, if a turning method is performed after turning with the shape at the time of grasping the main body, a quenching process is performed first, and then a slot is inserted and an opening margin is provided, the internal stress remains and the shape returns to open. This causes problems such as a reduced cost.

In view of the above, it is an object of the present invention to provide a method of manufacturing a collet chuck which can prevent deformation in a quenching step, eliminates the step of providing an opening margin, and has no internal stress and high accuracy. Things.

[0006]

According to the present invention, the main body is turned in a shape with an opening margin in the turning step, and the head of the main body is slit before the quenching step and then heat-treated. After the heat treatment, processing the screw part of the main body and slitting the waist of the main body, then shrink the main body and grind the head and trunk,
Thereafter, the bore and the tip are machined while the body is contracted to a grasped state.

Further, according to the present invention, the main body is turned in a shape with an opening margin in a turning step, the main body is heat-treated, and then the thread portion of the main body and the head and waist portion of the main body are slit at once. Then, the main body is shrunk to grind the head and the torso, and then the bore and the tip are machined while the main body is shrunk to a grasped state.

Therefore, according to the present invention, by turning the main body in a shape with an opening margin, there is no need to provide an opening margin later, and the quenching process can be performed before the slitting process. No deformation occurs.

[0009] If a squeezing process is performed after the quenching process, it is not necessary to open the slitted parts as in the prior art and provide an opening margin. Thereafter, the main body is shrunk and the head and the trunk are ground. Thereafter, if the bore and the tip are machined while the main body is contracted to the grasped state, the difference from the grasped state becomes the opening margin as it is, and there is no need to provide an opening margin, so that there is no problem of internal stress.

After the heat treatment of the main body in the quenching process,
In the method according to the first aspect, the head of the main body is subjected to a heat treatment after being subjected to a slitting process, and then a waist portion of the main body is subjected to a slitting process. The slitting of the head and waist is divided before and after the heat treatment.However, slitting the head of the main body before heat treatment does not cause deformation, which affects the shape and accuracy. There is no.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 to 4 are cross-sectional views showing the manufacturing process of the present invention of claim 1, FIG. 5 is a front view showing the manufacturing process of the present invention of claim 1, and FIGS. 6 to 8 show the manufacturing process of the present invention of claim 2. FIG.

According to the method of the present invention, according to the first aspect of the present invention, the outer diameter a of the head of the collet chuck body A and the inner diameter b of the bore portion of the collet chuck main body A are determined in consideration of the grinding shape with an opening margin in the turning step. It is processed by an NC lathe, heat-treated after processing a slot 2 on the head 1 of the main body A so as not to be deformed in the quenching process (FIG. 1).

After the heat treatment, the thread portion 12 of the main body A is machined, and the waist 3 of the main body A is machined with a slot 4 (FIG. 2). Then, the jig 5 is attached, the head 1 is ground into a taper 6 and the surface of the body 7 is ground while the slit portion of the main body A is shrunk beyond the grasped state, and then the main body A is slit. Jig 8
The bore 9 and the tip 10 are machined in the state of being attached to (FIG. 3). 4 and 5 show the completed state, and the difference between the outer diameter shown by the solid line and the outer diameter shown by the chain line is the opening margin c (FIGS. 4 and 5).

Next, according to a second aspect of the present invention, a head outer diameter a of the main body A is taken into consideration in consideration of a grinding shape with an opening margin in a turning process.
The machining of the bore diameter portion b with the NC lathe is the same as before.

Then, after turning, heat treatment is performed, and
Of the screw portion 12 and the slit 11 on the head 1 and the waist 3 of the main body A at a time (FIG. 6). After that, the jig 5 is attached, the head 1 of the main body A is tapered 6, and the surface of the body 7 is ground. Is the same as before (FIG. 7). FIG. 8 shows the completed state, and the difference between the outer diameter indicated by the solid line and the outer diameter indicated by the chain line is the opening margin c (FIG. 8).

[0016]

According to the present invention, by turning the main body in a shape with an opening margin, there is no need to provide an opening margin later, and the quenching process can be performed before the slitting process. As a result, no deformation occurs. In addition, the step of providing an opening margin is omitted, and the working process can be shortened. In addition, since the step of providing an opening margin is not performed, internal stress does not remain and the accuracy of the chuck can be improved. It is a useful invention.

[Brief description of the drawings]

FIG. 1 is a process chart showing an embodiment of the present invention according to claim 1;

FIG. 2 is a process chart showing an embodiment of the present invention according to claim 1;

FIG. 3 is a process drawing showing one embodiment of the present invention according to claim 1;

FIG. 4 is a process chart showing an embodiment of the present invention according to claim 1;

FIG. 5 is a process chart showing an embodiment of the present invention according to claim 1;

FIG. 6 is a process chart showing an embodiment of the present invention according to claim 2;

FIG. 7 is a process chart showing an embodiment of the present invention according to claim 2;

FIG. 8 is a process chart showing an embodiment of the present invention according to claim 2;

[Explanation of symbols]

 A Body 1 Head 2 Slot 3 Waist 4 Slot 5 Jig 6 Taper 7 Body 8 Jig 9 Caliber 10 Tip 11 Slut 12 Screw a Opening allowance

Claims (2)

(57) [Claims] In a turning process, a main body is turned in a shape having an opening margin, and a heat treatment is performed after a head portion of the main body is slit before a quenching process. After the heat treatment, the thread part of the main body and the waist part of the main body are subjected to slotting processing, then the main body is shrunk to grind the head and the torso, and then the caliber and the tip are cut with the main body shrunk to a grasped state. A method for manufacturing a collet chuck, comprising processing. 2. The main body is turned in a shape with an opening margin in a turning step, and after heat treatment of the main body, machining of a screw portion of the main body and slitting of a head portion and a waist portion of the main body are performed at once. A method of manufacturing a collet chuck, comprising: grinding a head and a torso by reducing the diameter of the body;