JPH069840U - Vibration prevention device for work on lathe - Google Patents

Abstract

(57) [Summary] [Purpose] The position of the pressing roller holding case is automatically adjusted to the optimum position for the outer diameter of the work by simply mounting the work on the lathe. [Constitution] When the work 1 is mounted at an appropriate position on the lathe, the outer diameter of the work 1 is measured by the outer diameter measuring means 15, and the control means 16 controls the driving means 14 based on the measured value. A case 8 that holds a pressing roller 12 that is biased in a protruding direction by a compression coil spring 10.
Is automatically moved so as to retreat with respect to the work 1 as the outer diameter of the work 1 increases, and the pressing roller 12 is constantly pressed against the work 1 with the optimum pressing force for the outer diameter of the work 1. Vibration during rotation of 1 is efficiently prevented.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vibration preventing device for a work in a lathe, which prevents vibration when the work is rotated by pressing a pressing roller against an outer peripheral surface of a part of a rod-shaped work mounted on the lathe.

[0002]

[Prior art]

 For example, as shown in FIGS. 3 to 5, when the outer peripheral surface of a desired turning portion A of a rod-shaped work 1 such as a rear axle shaft of an automobile is turned by a lathe, the work 1 is rotated by a turning center 2 and a turning center 3 of the lathe. While centering by and gripping by the chuck 4 on the side of the rotating center 3 and rotating the work 1 together with the spindle (not shown), the cutting tool 6 fixed to the tool rest 5 is brought close to the center axis L of the work 1. The turning portion A of the work 1 was turned to a desired size by moving the cutting portion 7a of the insert 7 of the cutting tool 6 by moving it in the X direction and the Y direction parallel to the central axis L.

In this case, if the work 1 is long, slight vibrations, that is, so-called “chatter” occurs when the work 1 rotates, which deteriorates turning accuracy and adversely affects the durability of the cutting edge 7 a of the tip 7. There is a risk that

In order to prevent such a fear, in a conventional lathe, a roller holder 9 is mounted in a bottomed cylindrical case 8 fixed to the lathe so as to face a direction orthogonal to the central axis L. A compression coil spring 10 that is fitted between the roller holder 9 and the bottom 8a of the case 8 urges the roller holder 9 in the direction of advancing from the case 8, By pressing a pair of presser rollers 12 pivotally attached to the tip of the holder 9 with a shaft 11 parallel to the central axis L against the outer peripheral surface of the intermediate portion of the work 1, the work 1 is slightly moved as described above. There is a work-vibration preventive device 13 provided to prevent vibration.

[0005]

[Problems to be solved by the device]

 In the conventional work vibration preventing apparatus 13 as described above, as shown in FIG. 4, when the work 1 having a small outer diameter is turned, the roller holder 9 is retracted against the biasing force of the compression coil spring 10. Since the amount is relatively small, there is no problem, but as shown in FIG. 5, when turning the work 1'having a large outer diameter, the amount of retreat of the roller holder 9 increases, and accordingly the compression coil spring The urging force of the work piece 10 becomes large, and the pressing force of the work piece 1 by the presser roller 12 becomes too large, resulting in misalignment or bending of the work piece 1. If turning work is performed in such a state, the outer shape after turning will be There is a risk of eccentricity, variations in the outer diameter dimension, and reduction in processing accuracy.

Therefore, conventionally, when turning the work 1 ′ having a particularly large outer diameter, the pressing force of the work roller 1 by the presser roller 12 is adjusted by shifting the mounting position of the case 8. There are problems that the work is complicated and that the adjustment cost must be dependent on the intuition of the operator, which requires skill.

In view of the above problems of the prior art, the present invention automatically adjusts the position of the case to the optimum position for the outer diameter of the work simply by mounting the work on the lathe. It is an object of the present invention to provide a vibration preventing device for a work on a lathe.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is designed to prevent vibration during rotation of a work by pressing a pressing roller against an outer peripheral surface of a part of a rod-shaped work mounted on a lathe. The preventive device is a drive unit that moves the case that holds the pressing roller so as to project toward the outer peripheral surface of the work in a direction orthogonal to the central axis of the work, and an outer diameter that measures the outer diameter of the work. A measuring device and a control device for controlling the driving device based on the outer diameter of the work measured by the outer diameter measuring means so as to retract the case as the outer diameter increases. I will.

[0009]

[Action]

 When the work is mounted at the proper position on the lathe, the outer diameter of the work is measured by the outer diameter measuring means, and the drive unit is controlled by the controller based on the measured value, and the case is The larger the outer diameter, the more automatically it is moved so as to move backward with respect to the work. Efficiently prevented.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The same components as those of the conventional one shown in FIGS. 3 to 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, the lathe has drive means 14 for moving the case 8 holding the pressing roller 12 so as to project toward the outer peripheral surface of the work 1 in the direction orthogonal to the central axis L of the work 1. And an outer diameter measuring means 15 for measuring the outer diameter of the work 1, and based on the outer diameter of the work 1 measured by the outer diameter measuring means 15, the case 8 is retracted as the outer diameter increases. A control device 16 for controlling the driving means 14 is provided.

The drive means 14 is provided with a guide rail 18 in a direction orthogonal to the central axis L on a support plate 17 fixed to a lathe, and a sliding member 19 fixed to the case 8 slides on the guide rail 18. The rotation shaft of the motor 20, which is freely mounted and fixed to the support plate 17, is coupled with a screw rod 22 that is screwed into a screw hole 21 parallel to the guide rail 18 formed in the sliding member 19 to operate the motor 20. Thus, by rotating the screw rod 22 in the predetermined forward and reverse directions, the case 8 together with the sliding member 19 can be moved back and forth with respect to the work 1. Reference numeral 23 is a bearing member that is fixed to the support plate 17 and rotatably supports the screw rod 22.

The outer diameter measuring means 15 is, for example, a well-known dial gauge type in which a retractable stylus 24 is directed in a direction orthogonal to the central axis L and its tip is pressed against the outer peripheral surface of the work 1. When the workpiece 1 is not attached, the zero point is set with the tip of the probe 24 positioned on the central axis L, and when the workpiece 1 is attached, it is pushed by the outer peripheral surface of the work 1. It is possible to electrically detect the pushing amount of the probe 24 and output the measured value to the control device 16. Further, the outer diameter measuring means 15 may have another known structure.

Based on the outer diameter of the work 1 measured by the outer diameter measuring means 15, the control device 16 determines the relationship between the outer diameter of the work 1 and the amount of advance of the case 8 as shown in FIG. The driving means 14 is controlled such that the driving amount of the case 8 becomes smaller as the outer diameter of the work 1 becomes larger.

With the configuration of this embodiment, when the work 1 is mounted at the proper position on the lathe, the outer diameter of the work 1 is measured by the outer diameter measuring means 15, and based on the measured value. The control means 16 controls the drive means 14 so that the case 8 is automatically moved so as to retract with respect to the work 1 as the outer diameter of the work 1 increases, and the pressing roller 12 is always set to the outer diameter of the work 1. It is pressed against the work 1 with an optimum pressing force, and vibration during rotation of the work 1 is efficiently prevented.

Therefore, even when turning the work 1 ′ having a large outer diameter, it is not necessary to shift the mounting position of the case 8 manually by an operator as in the conventional case, and the skill is not required. The condition can be adjusted automatically, which can contribute to the improvement of work efficiency.

It should be noted that the present invention is not limited to the above-described embodiment, and various changes and modifications can be made without departing from the scope of the present invention.

[0018]

[Effects of the Invention] As is clear from the above, according to the present invention, the following effects can be achieved. (a) Just by mounting the work on the lathe, the case position is automatically adjusted to the optimum position for the outer diameter of the work. It contributes to the improvement of work efficiency without needing to do so and requiring skill. (b) The pressing roller is always pressed against the work with the optimum pressing force for the outer diameter of the work, and vibration during rotation of the work is efficiently prevented.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a main part of a lathe equipped with a vibration prevention device according to an embodiment of the present invention.

FIG. 2 is a diagram showing the relationship between the outer diameter of the work 1 to be controlled by the control device and the amount of advance of the case 8.

FIG. 3 is a schematic plan view of a main part of a lathe equipped with a conventional vibration prevention device.

FIG. 4 is an enlarged cross-sectional view taken along the line BB of FIG.

5 is a sectional view similar to FIG. 4, showing a state in which a work having a large outer diameter is mounted.

[Explanation of symbols]

 1 Work 2 Stop Center 3 Rotation Center 4 Chuck 5 Turret 6 Tool 7 Tip 8 Case 9 Roller Holder 10 Compression Coil Spring 11 Shaft 12 Presser Roller 13 Vibration Prevention Device 14 Drive Means 15 Outer Diameter Measuring Means 16 Control Device 17 Support Plate 18 Guide rail 19 Sliding member 20 Motor 21 Screw hole 22 Screw rod 23 Bearing member L Center axis of work

Claims (1)

[Scope of utility model registration request] 1. A vibration preventing device for a work, wherein a pressing roller is pressed against an outer peripheral surface of a part of a rod-shaped work mounted on a lathe to prevent vibration during rotation of the work. Drive means for advancing and retracting the case that holds the pressing roller so as to project toward the outer peripheral surface of the work, outer diameter measuring means for measuring the outer diameter of the work, and the outer diameter A vibration control device for a work on a lathe, comprising: a control device that controls the drive means so as to retract the case based on the outer diameter of the work measured by the measuring means.