JPH0663204U - Rotating center for tailstock - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a center of rotation for a tailstock that can support a workpiece to be machined on a lathe so that it cannot be left uncut. [Structure] The tailstock rotation center 1 is the headstock C of the lathe A.
The other end of the work W clamped by the chuck F provided in the above is fitted and supported in the work fitting hole 4a of the work support 4 rotatably fitted in the cylindrical rotation center body 2. Therefore, since both ends of the workpiece W are firmly supported, the cutting portion a is not left uncut due to centrifugal force or its own weight. After the cutting, the work W supported by the support 4 is pressed from the rear by the pressing body 6 movably inserted into the cylinder and is easily discharged from the rotation center 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tailstock rotating center mounted on a tailstock of a lathe.

[0002]

[Prior art]

 Usually, when performing a parting process for cutting a workpiece to a predetermined size with a lathe, as shown in FIG. 5, a chuck F provided on the spindle of a headstock C installed at one end of the bed B of the lathe A is used. Therefore, one end of the work W is clamped, and the work W is cut by the parting tool G attached to the upper part of the carriage E that reciprocates toward the central axis of the headstock E by rotating it.

[0003]

[Problems to be solved by the device]

 However, if the above-described cutting process is continued, as shown in FIG. 6, the rigidity of the cutting portion a of the workpiece W is reduced, and the cutting portion a is cut during the cutting due to the centrifugal force and its own weight applied thereto, As shown in FIG. Therefore, in order to remove the uncut portion b, it is necessary to perform the cutting process again, and there is a problem that the cutting workability deteriorates.

Therefore, the free end of the workpiece W may be pressed and supported by using the rotation center 20 mounted on the tailstock D shown in FIG. 5 used for external rounding or thread cutting. In this case, As the pressing force is applied to the cut portion a whose rigidity is lowered, the cut portion a is broken during cutting as in the same manner as described above, and an uncut portion b is left.

Therefore, an object of the present invention is to provide a rotary center for a tailstock that can support a workpiece so that it cannot be left uncut.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention proposes that a workpiece support having a workpiece fitting hole is rotatably fitted into one end of a through hole formed in a rotary center body, and the workpiece pressing member is provided at the other end. It adopted a structure in which the body was movably fitted.

[0007]

[Action]

 The tailstock rotation center according to the present invention having the above-described structure supports and supports the free end of the workpiece machined by the lathe by inserting it into the workpiece fitting hole formed in the workpiece support. The cutting part is not subjected to centrifugal force or its own weight.

[0008]

【Example】

 As shown in FIG. 1, the lathe A is mounted on one end of the bed B, and the headstock C is moved correspondingly to the head B to be fixed on an arbitrary position according to the length of the workpiece W. The tailstock D comprises a tailstock D and a carriage E that reciprocates in the direction of the central axis of the headstock C. The tailstock D has the rotation center 1 mounted thereon. Then, both ends of the work W are supported by the chuck F provided on the headstock C and the rotation center 1, and the work W is cut to a predetermined size by the cutting tool G attached to the carriage E.

As shown in FIG. 2, the rotation center 1 is provided with a bearing 3 on the inner circumference of a front large-diameter cylindrical portion 2a of a stepped cylindrical rotation center main body 2 having a large diameter at both ends and having a through hole 1a. A workpiece support 4 which is in contact with this and rotates freely is inserted. A workpiece fitting hole 4a into which the workpiece W is fitted is formed in the support body 4, and the support body 4 is prevented from coming off by a cap screw 5 which is screw-engaged with the front large-diameter cylindrical portion 2a. . On the other hand, a workpiece pressing body 6 which reaches the inside of the front large-diameter cylindrical portion 2a through the inside of the intermediate small-diameter cylindrical portion 2C is movably fitted into the rear large-diameter cylindrical portion 2b.

The pressing body 6 has a leg body 7 fixed to a terminal end thereof, and is fixed to a fixing plate 8 having the leg body 7 fixed on a bed B.

In order to cut the workpiece W to a constant size by using the rotation center 1 having the above-described structure, as shown in FIG. 1, one end of the workpiece W is clamped by the chuck F of the headstock C, The other end is fitted into a support hole 4a formed in the holder 4 of the rotation center 1 to support both ends of the work W, and a drive mechanism (not shown) provided on the headstock C is driven to move the work W The workpiece W is cut into a fixed size by rotating the cutting tool G attached to the carriage E. At this time, since both ends of the workpiece W are securely supported, the cutting portion a is not subjected to centrifugal force or its own weight, and the workpiece W is cut into a predetermined size without breaking in the middle. Then, after cutting, the chuck F that holds the workpiece W is opened, and the tailstock E is moved backward together with the rotation center body 2 as shown by the arrow in the figure, so that the workpiece W supported by the support 4 is moved. The pressing body 6 connected to the fixed platen 8 fixed on the bed B pushes it out so that it can be easily discharged from the rotary center 1.

Next, as shown in FIGS. 3 and 4, a rotation center 10 of another embodiment will be described.

Since this one has the same configuration except that the configuration of the rotation center 1 and the front large-diameter cylindrical portion 2a of the above-described embodiment is different, the same parts are designated by the same reference numerals and the description thereof will be omitted. .

The front large-diameter cylindrical portion 2a has stepped holes 11 penetrating into the cylinder at two circumferentially equally divided positions on the same circumference, and each stepped hole 11 has a head portion. Supporting screws 12 are inserted to prevent the steps from coming off.

A portion of the supporting screw 12 protruding into the pipe is elastically biased by a panel 14 which is interposed between the supporting screw 12 and a set screw 13 that covers the stepped hole 11. Then, the inner cylindrical body 15 supported by the screw 12 is fitted into the cylinder, and is abutted against the bearing 16 provided on the inner cylindrical body 15 so that the support body 4 is freely rotatable. .

Therefore, in the rotation center 10, there is some deviation between the workpiece W clamped by the chuck F of the headstock C and the shaft center of the fitting hole 4a formed in the support 4 of the rotation center 10. Even if there is, there is an advantage that the workpiece W can be easily fitted into the fitting hole 4a.

[0017]

[Effect of device]

 As explained above, the tailstock rotation center of the present invention can support the cutting portion of the workpiece to be processed by the lathe so that centrifugal force and its own weight are not applied, so the workpiece breaks during cutting. It has a practical effect that can be cut to a fixed size without cutting.

[Brief description of drawings]

FIG. 1 is a front view of a lathe that uses an embodiment.

FIG. 2 is an exploded perspective view of the embodiment.

FIG. 3 is an exploded perspective view of a main part of another embodiment.

FIG. 4 is a vertical sectional view of the same.

FIG. 5 is a front view of a conventional lathe.

FIG. 6 is a front view showing a cutting state using a parting tool.

FIG. 7 is a perspective view of a workpiece that is broken during grinding.

[Explanation of symbols]

 1 Rotation Center 1a Through Hole 2 Rotation Center Main Body 3 Bearing 4 Support 5 Cover Screw 6 Workpiece Pusher 7 Leg 8 Fixing Plate 10 Center of Another Example 11 Stepped Hole 12 Support Screw 13 Set Screw 14 Spring 15 Inner cylinder A Lathe B Bed C Headstock D Tailstock E Reciprocating table F Chuck G Parting tool

Claims (1)

[Scope of utility model registration request] 1. A workpiece support having a workpiece fitting hole is rotatably fitted into one end of a through hole formed in the rotary center body, and a workpiece pressing body is movably fitted into the other end. Rotating center for tailstock.