JPH0574702U - Non-circular processing unit - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention provides a unit for non-circular machining attached to a tool rest of an NC lathe. A movable body 22 to which a tool T is attached is inserted into a square hole of a main body 21 of a rectangular frame opening in the cutting direction, and is supported by upper and lower rollers 23a and 23b and left and right rollers 24a and 24b. The outer sides of the upper and lower rollers 23a and 23b are in contact with the lower plate upper surface and the upper plate lower surface of the balance weight 26 so as not to slip. When the movable body 22 connected to the output body of the linear motor 27 is moved back and forth by the linear motor, the balance weight 26 moved in the opposite direction cancels the vibration. Therefore, highly accurate non-circular processing can be performed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a non-circular machining unit provided on a tool post when performing non-circular machining on a lathe.

[0002]

[Prior Art]

 Conventionally, as shown in FIG. 4, when a non-circular workpiece is machined by turning with a known NC lathe, a signal for synchronizing the rotation of the workpiece 1 from the pulse generator 3 provided on the spindle 2 is used. Based on the above, the NC unit controls the drive unit 6 of the non-circular machining unit 5 on the tool rest 4 capable of controlling the X and Z axes. The position of the movable body to which the tool of this non-circular machining unit is attached is output by the linear scale device 7 to the NC device. For example, as shown in FIG. 5, at the tip of a movable body 12 which is vertically and horizontally supported by a plurality of rollers 3 on a main body 11 of a rectangular frame opened in a cutting feed direction on a tool rest 4 so as to have no gaps. A tool T is attached.

The movable body 12 is connected to an output body 14 a of a linear motor 14 provided on the main body 11. For non-circular machining with this tool, the tool rest 4 is controlled by X and Z with the NC controller to position it at the cutting start position, the spindle 2 is rotated, and the rotation angle of the spindle 2 is output to the NC device by the pulse generator 3. Then, the linear motor 14 is energized to linearly move the output body 14a, the movable body 12, and the tool T. From this position signal of the linear scale device 7 and the spindle index signal of the pulse generator 3, the position of the tool T with respect to the spindle rotation angle is determined. The tool T is driven while maintaining a predetermined relationship with the position stored in the NC program, and the tool T repeats reciprocating motion with a predetermined amplitude to perform non-circular machining.

[0004]

[Problems to be solved by the device]

 As described above, there is a problem that vibration is generated due to a change in acceleration caused by the reciprocating motion of a tool and a member having a large mass of a movable part, which deteriorates machining accuracy. In addition, there is a problem in that it is difficult to increase the cutting speed and it is difficult to improve productivity if it is attempted to suppress the occurrence of vibration and not affect the processing. In addition, there is a limit to the weight of the moving part in terms of rigidity, and even with the method of correcting the error due to the vibration, there is a problem that the expected result cannot be obtained because the vibration varies. The present invention has been made in view of the above problems of the conventional technology. The purpose of the present invention is to reduce the vibration caused by the reciprocating motion of the movable part to improve the machining accuracy and increase the cutting speed. It is intended to provide a non-circular processing device that can be used.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is a machining unit that is mounted on a tool post of a lathe and controls non-circular machining by controlling the cutting feed in synchronism with the rotation of the spindle. A main body of a rectangular frame attached to the tool rest; a movable body which is inserted into the rectangular frame of the main body and is vertically and horizontally supported by a plurality of rollers so that it can be moved forward and backward without a gap and a tool is attached to a tip thereof; A driving device, which is provided in the main body and is movable in the cutting direction, is connected to the driving device, which is connected to the movable member, and is slidably brought into contact with the outsides of the plurality of vertically arranged rollers, and is connected to the movable member, the tool, and the movable member. A balance weight having a mass equivalent to that of the output body is included, and the movable body and the balance weight swing in opposite directions during processing.

[0006]

[Action]

 Since the balance weight reciprocates in the opposite direction via the roller with respect to the movable body and the tool reciprocally moved by the driving body, the impact force at the time of reversal is canceled and vibration is suppressed.

[0007]

【Example】

 The non-circular machining unit of the present invention will be described with reference to FIGS. The main body 21 forms a rectangular frame that opens in the cutting direction of the tool rest, and a movable body 22 to which a tool T is attached is inserted into the hollow portion of the main body 21. The movable body 22 includes a plurality of rollers 23a rotatably supported by the main body 21, the lower surface of which is a roller 23b, the upper surface of which is also a plurality of rollers 24a, the right side of which is a roller 24b, and the left side of which is free of gaps. Is supported as. The rollers 23a and 23b are made to have the same diameter, the roller surfaces project outward from the windows of the upper and lower frames of the main body 21, and the balance is formed by connecting the upper plate 26b and the lower plate 26a at the side surface. The roller 23a contacts the upper surface of the lower plate 26a of the weight 26, and the roller 23b contacts the lower surface of the upper plate 26b.

The distance between the upper plate and the lower plate of the balance weight 26 is made so that there is no slippage at this contact portion. The ball weight 26 has a mass equivalent to the mass including the tool T, the movable body 22, and the output body of the linear motor 27 described later. The linear motor 27 of the drive unit 27 is a known one, and a permanent magnet 27b is attached to each of the upper pole and the lower pole of the Y-shaped yoke 27a, and is formed in a flat plate shape between the permanent magnet 27b and the central pole. A coil 27c input from the NC device is interposed, and the coil 27c is held by a bobbin 27d that serves as an output body. The output body of the bobbin 27d and the rear end of the movable body 22 are connected to each other.

The operation of the present invention thus constructed will be described. When the output of the angular position data stored in the program of the NC device based on the signal of the spindle angle of the pulse generator 3 is sent to the linear motor 27, the bobbin 27d is moved in the X-axis direction and the tool T The position is output to NC by the linear scale device 7, and the movable body 22 and the tool T are moved back and forth so as to cut a predetermined non-circular profile. When the movable body 22 moves forward, the roller 23a turns counterclockwise to retract the lower plate of the balance weight 26, and similarly, the roller 23b having the same diameter rotates clockwise to retract the upper plate of the rose weight 26 by the same amount. The balance weight 26 moves backward by the same amount as the movable body 22 moves forward, and the balance weight moves forward by the same amount when the movable body moves backward. Since the two have the same mass, the vibration of the moving part is canceled.

[0010]

[Effect of the device]

 As described above, the present invention has the following effects. Since the vibration of the movable part is suppressed, high-precision machining is possible. In addition, high speed can be achieved by flowing a large current using a large linear motor that can generate a large force of the drive unit as the mass increases.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional perspective view of a non-circular processing unit of the present invention.

FIG. 2 is a vertical sectional view of a balance weight portion of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a schematic explanatory diagram of a lathe provided with a non-circular processing unit.

FIG. 5 is a partial cross-sectional perspective view of a conventional non-circular processing unit.

[Explanation of symbols]

21 main body 22 movable body T tool 23a, 23b, 24
a, 24b roller 26 balance weight 27 drive device

Claims (1)

[Scope of utility model registration request] 1. A machining unit which is mounted on a tool post of a lathe and performs non-circular machining by controlling a cutting feed in synchronization with rotation of a spindle, and which is a square unit which is opened in a cutting direction and is mounted on the tool post. Body of the frame, a movable body which is inserted into the rectangular frame of the body and is supported vertically and horizontally by a plurality of rollers so as to be able to move forward and backward without a gap, and a tool is attached to the tip of the movable body. The movable output body has a mass equivalent to that of the drive device connected to the movable body and the output body connected to the movable body, the tool, and the movable body without slipping contact with the outside of the plurality of vertically arranged rollers. A non-circular machining unit including a balance weight, wherein the movable body and the balance weight oscillate in opposite directions during machining.