JP2000288809A - Chuck for machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a top jaw not only for a chuck of a constant size but also for chucks of different sizes by providing a level difference on a T-nut. SOLUTION: This chuck capable of holding a work has a top jaw 2a having a depressed part 7a, a T-nut 3c capable of fitting in the depressed part 7a of the top jaw 2a and having a chin part 311c, a master jaw 4b having a depressed part 8b capable of fitting on the T-nut 3c, and a chuck main body 5a whereon the master jaw 4b is attached. The T-nut 3c is provided with a level difference 11 parallel to the chin part 311c on a trunk part 32c in a depth direction, and has a narrow part 12 formed on a head part 31c side and a broad part 13 on a tail part 322a side. The narrow part 12 of the T-nut 3c abuts on the depressed part 8b of the master jaw 4b and is fitted in it. The broad part 13 of the T-nut 3c abuts on the depressed part 7a of the top jaw 2a and is fitted in it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool chuck used for mounting a workpiece on a machine tool.

[0002]

2. Description of the Related Art Generally, when a workpiece is mounted on a machine tool such as a lathe, the workpiece is held and fixed on a chuck. The chuck mainly includes a top jaw that holds a work, a T-nut that can be fitted to the top jaw, a master jaw that can be fitted to the T-nut, and a chuck body to which the master jaw is attached.

Each component of such a chuck has one set for each size of the chuck, for example, 6 inches, 8 inches, 10 inches, etc., and has a T for mounting the top jaw to the chuck. The nut was determined according to the chuck size. Therefore, for example, a T-nut for 8 inches is dedicated to 8 inches and cannot be used for other sizes at present.

[0004] However, it is customary to use a top jaw which is formed by processing a holding portion into a shape which is easy to hold for each processing object, and it is troublesome to process all top jaws for each size. It was costly. Therefore, if the top jaw can be used not only for a chuck of a specific size but also for a chuck of another size, there is no need to prepare a plurality of top jaws for each chuck size, and the manufacturing cost of the top jaw and Storage costs should be reduced.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. By providing a step in a T-nut, not only a chuck having a fixed size but also a chuck having a certain size can be obtained.
An object of the present invention is to provide a chuck for a machine tool that can use a top jaw for chucks of different sizes.

[0006]

According to a first aspect of the present invention, there is provided a top jaw having a concave portion capable of holding a work, and capable of being fitted to a concave portion of the top jaw. A chuck for a machine tool comprising: a T-nut having a jaw; a master jaw having a concave portion capable of being fitted to the T-nut; and a chuck body to which the master jaw is attached. By providing a step parallel to the jaw in the depth direction on the body, a narrow portion is formed on the head side and a wide portion is formed on the tail side, and the narrow portion of the T-nut is the master jaw. The wide portion of the T-nut abuts and fits into the recessed portion of the top jaw.

According to a second aspect of the present invention, there is provided a top jaw capable of holding a work and having a recess, a T-nut capable of being fitted in the recess of the top jaw and having a jaw, and being fitted to the T-nut. In a machine tool chuck having a master jaw having a matable recess and a chuck body to which the master jaw is attached, the T-nut is provided on a body of the chuck with the jaw in a depth direction. By providing parallel steps, the wide part on the head side,
A narrow portion is formed on the tail side, the wide portion of the T-nut abuts and fits into the recess of the master jaw, and the narrow portion of the T-nut abuts and fits the recess of the top jaw. It is characterized by the following.

According to a third aspect of the present invention, there is provided a top jaw capable of holding a work and having a concave portion, a T-nut capable of being fitted into the concave portion of the top jaw and having a jaw, and being fitted to the T-nut. In a machine tool chuck having a master jaw having a recess that can be fitted and a chuck body to which the master jaw is attached, a U-shaped cover that covers a tail part and a part of a body of the T nut is provided. By the fitting, a step parallel to the jaw is provided in the body of the T nut in the depth direction, a narrow portion is formed on the head side, and a wide portion is formed on the tail side. The narrow portion is fitted in contact with the concave portion of the master jaw, and the wide portion of the T-nut is fitted in contact with the concave portion of the top jaw.

According to a fourth aspect of the present invention, there is provided a top jaw capable of holding a workpiece and having a recess, a T-nut capable of fitting into the recess of the top jaw and having a jaw, and fitting the T-nut. In a machine tool chuck having a master jaw having a recess that can be fitted and a chuck body to which the master jaw is attached, a plate-like body having a height dimension smaller than the height dimension of a body section is formed by the above-described method. By making contact with the torso side and the jaw of the T-nut, a step parallel to the above-mentioned jaw is provided in the torso of the T-nut in the depth direction, and the wide part is provided on the head side and the width is provided on the tail part. A narrow portion is formed, the wide portion of the T-nut abuts and fits into the recess of the master jaw, and the narrow portion of the T-nut abuts and fits into the recess of the top jaw. I do.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a machine tool chuck according to the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a conventionally known machine tool chuck. The machine tool chuck 1 includes a top jaw 2 for holding a work, a T-nut 3 that can be fitted to the top jaw 2, a master jaw 4 that can be fitted to the T-nut 3, and a master jaw 4 that can be fitted to the T nut 3. And a cylindrical chuck body 5 to which can be attached in the radial direction. The top jaw 2, the T nut 3, the master jaw 4, and the chuck body 5 are one for each specific size.
It is a set. The top jaw 2, the T-nut 3, and the master jaw 4 are combined into one set, and are attached to the one end surface of the chuck body 5 at equal intervals of 120 °. The work is sandwiched between the inner ends of the three top jaws 2 at the center position on the inner peripheral side of the chuck body 5, or is expanded in the radial direction on the outer peripheral side of the chuck body 5 by the outer ends of the three top jaws 2. In, it is fixed.

[0011] Each component of the conventional chuck for a machine tool having such a configuration has one set of chucks each having a size of, for example, 8 inches or 6 inches.
FIG. 2 shows an example of the chuck section for 8 inches, and FIG. 3 shows an example of the chuck section for 6 inches. As shown in FIGS. 1 and 2, the top jaw 2a is formed by processing a rectangular parallelepiped metal, and two screw insertions are provided on a center line in a longitudinal direction of the upper surface (a direction perpendicular to the paper surface in FIG. 2). Holes 6a, 6a are provided. In addition, on the center line in the length direction of the lower surface,
The depression 7a is provided over the entire length in the length direction. The width of the recess 7a is determined by the tail 32 of the T-nut 3a described below.
The size is slightly larger than the width of 2a.

The T-nut 3a has a head 31a and a torso 32a.
The head 31a is provided with a jaw 311a having a surface perpendicular to the side surface 321a of the trunk 32a, and the trunk 32a is provided with a tail 3 having a surface parallel to the jaw 311a.
22a is provided on the side opposite to the head 31a. Tail 3
22a is slightly smaller than the width of the recess 7a, so that the tail 322a and the tail 322a
A part of the side surface 321a continuous with the top jaw 2a is fitted into the recessed portion 7a of the top jaw 2a. Tail 322 of T nut 3a
Screw holes 25a, 25a are provided at positions corresponding to the two screw insertion holes 6a, 6a provided in the top jaw 2a on the center line in the longitudinal direction of the top jaw 2a, and the screws 26a are screwed into the screw insertion holes 6a, 25a. Into the screw holes 25a, 25
a, the top jaw 2a and the T-nut 3a are attracted to each other, and the jaw 31 of the T-nut 3a
1a, the master jaw 4a is pulled up, and a serrated surface 411a of the master jaw 4a, which will be described later, and a serrated surface 211a of the top jaw 2a are attracted to each other and come into contact with each other.
a, the master jaw 4a is fixed integrally.

The master jaw 4a is formed by processing a rectangular metal so as to have protrusions 10a on the left and right sides for retaining the master jaw 4a.
Has a recess 8a into which a part of a head 31a and a body 32a continuous with the head 31a can be fitted.
The T nut 3a is fitted to a. The master jaw 4a is fitted into a recess 9a provided from the outer periphery toward the inner periphery on one end surface side of the cylindrical chuck main body 5a, and is, for example, controlled within a predetermined range in the radial direction of the chuck main body 5a by hydraulic control. Mounted movably.

The upper surface of the master jaw 4a and the lower surface of the top jaw 2a are serrated surfaces 411a and 411 each having peaks and valleys arranged at a predetermined pitch in the longitudinal direction.
1a, these serrated surfaces 41
1a and 211a are meshed with each other, and the master jaw 4
When a is pressed toward the center of the chuck body 5a by the pressure of air or the like, the top jaw 2a is also pressed toward the center of the chuck body 5a, and the work disposed at the center of the chuck body 5a is moved to the chuck body 5a. Or the master jaw 4a moves radially outward of the chuck body 5a together with the T nut 3a and the top jaw 2a, whereby the work is fixed at the outer end of the top jaw 2a. I have.

FIG. 3 shows an example of a chuck portion for 6 inches, and similarly to FIG.
b, the master jaw 4b, and the chuck body 5b constitute one set to constitute a machine tool chuck. The example of FIG. 3 is substantially similar to the example of FIG.
It is smaller than the example of FIG.

Thus, the top jaw 2 for 8 inches
a, a T nut 3a, a master jaw 4a, and a chuck body 5a are a set of four, and a 6-inch top jaw 2b, a master jaw 4b, and a chuck body 5
b is also a set of four, and there is currently no compatibility.

However, it is customary to use a top jaw which is formed by machining a holding portion into a shape which can be easily held for each processing object. Conventionally, it is necessary to machine all top jaws for each size. However, it takes a lot of time and effort to increase the cost. Therefore, it has been desired that the top jaw can be used not only for a specific size but also for a chuck of another size.

The present invention has been made to solve the above-mentioned problems of the prior art. Hereinafter, specific examples of the machine tool chuck according to the present invention will be described.
As shown in FIGS. 2 and 3, in the conventional machine tool chuck, the T-nut has a head and a body perpendicular to the head. Therefore, the T-nut 3a for 8 inches shown in FIG. 2 and the T-nut 3b for 6 inches shown in FIG. 3 are processed in substantially similar shapes. For example, the T-nut 3a made for 8 inches is Even if an attempt is made to fit a top jaw and a master jaw for a size larger than 8 inches, the depressions provided in the top jaw and the master jaw are too large to form a gap, resulting in misalignment. On the other hand, when trying to fit the top jaw and the master jaw for a size smaller than 8 inches, the recesses provided in the top jaw and the master jaw were too small to fit. Therefore, in the present invention, by devising the shape of the T-nut, the top jaw can be used not only for a specific size but also for a master jaw and a chuck body of another size.

First, an example in which a top jaw for a large size can be used for a master jaw and a chuck body for a small size will be described. The top jaw shown in FIG. 4 is the same as the top jaw 2a for 8 inches shown in FIG.
Are the same as the master jaw 4b and chuck body 5b for 6 inches shown in FIG. Body 32c of T nut 3c
And a step 1 parallel to the jaw 311c in the depth direction.
1, a narrow portion 12 is formed on the head side, and a wide portion 13 is formed on the tail side. The width of the narrow portion 12 is equal to the width of the body portion 32b of the T-nut 3b for 6 inches shown in FIG. 3, and the width of the wide portion 13 is the T nut 3a for 8 inches shown in FIG.
Is equal to the width of the trunk 32a. Both sides of the narrow portion 12 of the T nut 3c and the jaw 311c are fitted in contact with the recess 8b of the 6-inch master jaw 4b.
Both side surfaces of the wide portion 13 of the nut 3c abut the fitting 7a of the 8-inch top jaw 2a and are fitted.

Therefore, by using the T nut 3c, as shown in FIG. 4, the top jaw 2a for 8 inches is used.
For the 6 inch master jaw 4b and chuck body 5
b can also be used.

In the above embodiment, an example is shown in which the top jaw 2a for 8 inches is applied to the master jaw 4b for 6 inches and the chuck body 5b.
The width of the wide portion 13 of the nut 3c is kept at the width for 8 inches, and the head 31c and the trunk 32c of the T nut 3c
By setting the dimensions of the T-nut for inches, it becomes possible to apply the top jaw 2a for 8-inch to the master jaw for smaller size. As a result, it is not necessary to prepare top jaws of all sizes, so that it is not necessary to process the top jaws, and it is possible to save resources and effectively use the resources.

Next, an example in which a top jaw for a small size can be used for a master jaw and a chuck body for a large size will be described with reference to FIG. The top jaw shown in FIG. 5 is the same as the 6-inch top jaw 2b shown in FIG. 3, and the master jaw and chuck body are the same as the 8-inch master jaw 4a and chuck body 5a shown in FIG. Are the same. A step 14 parallel to the jaw 311d is provided in the body 32d of the T-nut 3d in the depth direction, and a wide portion 15 is formed on the head side and a narrow portion 16 is formed on the tail side. The width of the wide portion 15 is the body portion 32 of the T-nut 3a for 8 inches shown in FIG.
The width of the narrow portion 16 is equal to the width of the trunk portion 32b of the 6-inch T-nut 3b shown in FIG. Both side surfaces of the wide portion 15 and the jaw 311d of the T nut 3d are fitted in contact with the recess 8a of the 8-inch master jaw 4a, and the narrow portion 16 of the T nut 3d is fitted.
Recesses 7b of the top jaw 2b for 6 inches on both sides
Abuts and is fitted.

Therefore, by using the T nut 3d, as shown in FIG. 5, the top jaw 2b for 6 inches is used.
8 inch master jaw 4a and chuck body 5
a can also be used.

In the above embodiment, an example in which the 6-inch top jaw 2b is applied to the 8-inch master jaw 4a and the chuck body 5a has been described.
The width of the narrow portion 16 of the nut 3d is kept at the width for 6 inches, and the head 31d and the trunk 32d of the T nut 3d are, for example, 1
By setting the size of the T-nut for 0 inch, it is possible to apply the top jaw 2b for 6 inch to the master jaw for a larger size. As a result, it is not necessary to prepare top jaws of all sizes, so that it is not necessary to process the top jaws, and it is possible to save resources and effectively use the resources.

As a modification of the T-nut 3c shown in FIG. 4, as shown in FIG. 6, a U-shaped cover 17 covering a tail 322 of the T-nut 3 and a part of the body 32 is fitted. Thereby, a step 18 parallel to the jaw 311 is provided in the body 32 of the T nut 3 in the depth direction, and a narrow portion 19 is formed on the head 31 side and a wide portion 20 is formed on the tail 322 side. Can be. Therefore, by fitting the U-shaped cover 17 to the conventional T nut, the top jaw for the large size is used for the master jaw and the chuck body for the small size, similarly to the T nut 3c shown in FIG. can do. Further, according to this embodiment, it is possible to use top jaws of different sizes only by adding the cover 17, and there is an advantage that it is not necessary to perform special processing on the T nut itself.

As an improved example of the T-nut 3d shown in FIG. 5, as shown in FIG. 7, a plate-shaped body 21 whose height is smaller than the height of the body 32 is used as the body of the T-nut 3d. Part 3
2 and the jaw 311 of the head 31 is fixed by abutting on the jaw 311 of the T-nut 3d. The wide portion 23 on the 31 side and the narrow portion 2 on the tail 322 side
4 can be formed. Therefore, the plate-like body 21 is
By providing the nut 3d on both sides of the body 32, FIG.
As in the case of the T-nut 3d shown in FIG. 5, a top jaw for a small size can be used for a master jaw and a chuck body for a large size. Also in this embodiment, there is an advantage that top jaws of different sizes can be used only by adding the plate-like body 21 and without processing the T nut itself.

Even when a split-type T nut is used, as shown in FIG. 8, a U-shaped cover can be formed by covering the tail portions 322 of the two T nuts 3 with each other. The same effects as those of the embodiment shown in FIG. 6 can be obtained, and as shown in FIG.
Can be brought into contact with and fixed to the body portions 32 of the two divided T nuts 3, 3, whereby the same effect as in the embodiment shown in FIG. 7 can be obtained. Further, in the above embodiment, the set of the top jaw, the T-nut and the master jaw is attached to one end face of the chuck body.
Although the example of the three-jaw chuck attached at equal intervals of 0 ° has been described, it is needless to say that the design can be appropriately changed to a four-jaw chuck, a five-jaw chuck, or the like depending on the size of the chuck.

[0028]

According to the first aspect of the present invention, there is provided a top jaw capable of holding a work and having a recess, a T-nut having a jaw capable of being fitted into the recess of the top jaw, and In a machine tool chuck having a master jaw having a recess that can be fitted to a T-nut and a chuck body to which the master jaw is attached, the T-nut is provided on a body of the chuck in a depth direction. By providing a step parallel to the jaw, a narrow portion is formed on the head side and a wide portion is formed on the tail side, and the narrow portion of the T-nut abuts and fits into the recess of the master jaw. , The wide portion of the T-nut comes into contact with the recess of the top jaw so that the top jaw can be used for chucks made for sizes other than the specified size. It is not necessary to process the top jaw, as well as enabling costs, can be saved and effective use of resources.

According to the second aspect of the present invention, a top jaw capable of holding a work and having a concave portion, a T-nut capable of fitting into the concave portion of the top jaw and having a jaw, and the T-nut A chuck for a machine tool, comprising: a master jaw having a concave portion that can be fitted into the jaw; and a chuck body to which the master jaw is attached. By providing a step parallel to the portion, a wide portion is formed on the head side and a narrow portion is formed on the tail side, and the wide portion of the T-nut abuts and fits into the recess of the master jaw. The narrow part of the top jaw is abutted against the recess of the top jaw so that the top jaw can be used for chucks made for sizes other than the specified size. It is not necessary to process the top jaw, as well as enabling costs, can be saved and effective use of resources.

According to the third aspect of the present invention, a top jaw capable of holding a work and having a recess, a T-nut capable of fitting into the recess of the top jaw and having a jaw, and the T-nut A chuck for a machine tool comprising a master jaw having a recess that can be fitted into the master jaw and a chuck body to which the master jaw is attached. By fitting the cover, a step parallel to the jaw is provided in the body of the T-nut in the depth direction, and a narrow portion is formed on the head side and a wide portion is formed on the tail side. The narrow part of the nut abuts and fits into the recess of the master jaw,
The wide portion of the T-nut comes into contact with the recess of the top jaw so that the top jaw can be used for chucks made for sizes other than the specified size. It is not necessary to process the top jaw, thereby making it possible to reduce costs and to save resources and effectively use resources.

According to the fourth aspect of the present invention, a top jaw capable of holding a work and having a concave portion, a T-nut capable of fitting into the concave portion of the top jaw and having a jaw, and the T-nut In a machine tool chuck having a master jaw having a recessed portion that can be fitted to a chuck body, and a chuck body to which the master jaw is attached, a plate-like body having a height dimension smaller than the height dimension of a body section is provided. , The above T
By contacting the nut side and the jaw, the T
A step parallel to the jaw is provided in the body of the nut in the depth direction, a wide portion is formed on the head side and a narrow portion is formed on the tail side, and the wide portion of the T nut is a depression of the master jaw. The narrow part of the T-nut abuts against the recess of the top jaw so that it fits into the top jaw. It is possible to use it, and it is not necessary to process the top jaw for each size, and it is possible to reduce the cost, and to save resources and effectively use the resources.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a conventional chuck for a machine tool.

FIG. 2 is a front view showing an example of a T-nut that can be used in a conventional 8-inch machine tool chuck and its periphery.

FIG. 3 is a front view showing an example of a T-nut that can be used in a conventional chuck for a 6-inch machine tool and its periphery.

FIG. 4 is a front view showing an example of a T-nut that can be used in the chuck for a machine tool according to the present invention and its periphery.

FIG. 5 is a front view showing another example of a T-nut that can be used in the chuck for a machine tool according to the present invention and its periphery.

FIG. 6 is a perspective view showing still another example of a T-nut that can be used for the machine tool chuck according to the present invention.

FIG. 7 is a perspective view showing still another example of a T-nut that can be used for the machine tool chuck according to the present invention.

FIG. 8 is a perspective view showing still another example of a T-nut that can be used for the machine tool chuck according to the present invention.

FIG. 9 is a perspective view showing still another example of a T-nut that can be used for the machine tool chuck according to the present invention.

[Explanation of symbols]

 2a Top jaw 3c T nut 4b Master jaw 5b Chuck body 7a Recessed portion 8b Recessed portion 9a Recessed portion 11 Step 12 Narrow portion 13 Wide portion 31c Head 32c Body 311c Jaw 322c Tail

Claims (4)

[Claims] 1. A top jaw capable of holding a work and having a depression, a T-nut having a jaw capable of being fitted to the depression of the top jaw, and a depression capable of being fitted to the T-nut. A machine tool chuck comprising: a master jaw having the master jaw; and a chuck body to which the master jaw is attached. The T nut has a body with a step parallel to the jaw in a depth direction. As a result, a narrow portion is formed on the head side and a wide portion is formed on the tail side. The narrow portion of the T-nut abuts and fits into the recess of the master jaw, and the wide portion of the T-nut corresponds to the top jaw. A chuck for a machine tool, which is fitted in contact with a concave portion. 2. A top jaw capable of holding a workpiece and having a recess, a T-nut having a jaw capable of being fitted in the recess of the top jaw, and a recess capable of being fitted in the T-nut. A machine tool chuck comprising: a master jaw having the master jaw; and a chuck body to which the master jaw is attached. The T nut has a body with a step parallel to the jaw in a depth direction. As a result, a wide portion is formed on the head side and a narrow portion is formed on the tail side. The wide portion of the T-nut abuts and fits into the recess of the master jaw, and the narrow portion of the T-nut corresponds to the top jaw. A chuck for a machine tool, which is fitted in contact with a concave portion. 3. A top jaw capable of holding a workpiece and having a recess, a T-nut having a jaw capable of being fitted to the recess of the top jaw, and a recess capable of being fitted to the T-nut. A master jaw having the same and a chuck body to which the master jaw is attached. In a chuck for a machine tool, a U-shaped cover that covers a tail part and a part of a body part of the T nut is fitted. A step parallel to the jaw is provided on the body of the T-nut in the depth direction, a narrow portion is formed on the head side, and a wide portion is formed on the tail side. The narrow portion of the T-nut is a master jaw. A chuck for a machine tool, wherein a wide portion of a T-nut abuts and is fitted to a recess of a top jaw. 4. A top jaw capable of holding a workpiece and having a recess, a T-nut having a jaw capable of being fitted to the recess of the top jaw, and a recess capable of being fitted to the T-nut. A machine tool chuck comprising: a master jaw having a master jaw; and a chuck body to which the master jaw is attached. And by contacting the jaw,
A step parallel to the jaw is provided in the body of the T nut in the depth direction, a wide portion is formed on the head side, and a narrow portion is formed on the tail side. The wide portion of the T nut is a master jaw. A chuck for a machine tool, wherein the chuck is fitted in contact with the recess, and the narrow portion of the T-nut is fitted in contact with the recess of the top jaw.