JPH0192004A - Lead can machine - Google Patents

Abstract

PURPOSE:To carry out highly accurate cam cutting and micro taper cutting with high speed by driving a main shaft table incorporating a motor, a cutter table and a machining unit incorporating a servo motor respectively in Z, X and Z directions through static bearings. CONSTITUTION:A servo motor 4 rotates to move a main shaft table 5 in Z- direction through a static bearing so as to rotate a servo motor 12 thus moving a cutter table 11 in X-direction through a static bearing and positioning the cutter table, then a main shaft is rotated through a built-in motor and rotary angle thereof is outputted from a pulse generator 8. A slide sleeve 18 is vibrated by a servo motor 20 in a lead machining unit 15 and driven with predetermined positional relation being held with respect to the rotary angle of of the main shaft based on a positional signal fed from a linear scale 25 and a main shaft index signal fed from the pulse generator. Then feeding/cutting of the main shaft table 5 in Z-direction and micro movement of the cutter table 11 in X- direction are carried out simultaneously thus carrying out micro taper cutting of tape travel face and cutting of cam lead face simultaneously through a cutter 28.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an NC lathe for machining lead cams.

Prior Art Conventionally, for example, a special machine using a mask cam has been used to cut the cam lead surface on the outer periphery of the lower drum and the tape running surface having a minute taper unique to video heads, as shown in FIG. 7 of parts for video heads. However, in recent years, NC lead cam processing machines have been developed and come into use. As shown in Part 8, in addition to the spindle rotation motor, this device is equipped with a spindle indexing servo motor 101, and a clutch 102 switches between spindle rotation and spindle indexing.
A tool rest 104 is placed on a carriage 103 movable in the Z-axis direction so as to be movable in the X-axis direction, and a lead processing unit 105 is mounted on the tool rest 104. The tool holder 106 of the lead processing unit is moved by a servo motor 107 via a ball nut screw 108 in the Z-axis direction in accordance with the indexing of the main spindle.

Problems to be Solved by the Invention Conventional cam-type dedicated machines have the drawback of requiring skill to manufacture and modify, resulting in poor processing efficiency. Recently developed NC
The lead cam processing machine was able to omit the skilled work required for manufacturing and modification, but since the guide surface is a sliding bearing, there is a large sliding resistance and the inertia of the moving body is large, so it is difficult to adjust the lead cam processing machine to match the rotation angle of the main shaft at high speed. The problem was that it was not possible to control the movement of the blade, and it was not possible to obtain machining efficiency higher than that of a cam-type dedicated machine.

Means for solving the problem A headstock 5 provided movably in two axes on a base l
a first static pressure bearing bearing the headstock 5; a first driving member of the headstock 5; a main spindle 6 rotatably supported on the headstock 5; and rotation and indexing of the main spindle 6. a second driving member for performing the above-mentioned operation, a tool rest 11 provided on the base 1 so as to be movable in the X-axis direction, a second hydrostatic bearing for bearing the tool rest 11, and a third driving member for the tool rest 11. and the said tool rest 1
1, a lead processing unit 15 having a tool holder 27 at the tip of a slide sleeve 18 that is movable in the X-axis direction, a third static pressure bearing that supports the slide sleeve, and a fourth drive member of the lead processing unit. and an NC device for controlling each of the drive members.

Example Embodiments of the present invention will be described below based on the drawings.

As shown in FIGS. 1 and 2, a Z-axis fixing base 2 having a guide surface 2a in the X-axis direction is fixed to the right side of the base 1, and a main spindle lower base is mounted on the two-axis fixing base 2 via a hydrostatic bearing. 3 is placed movably, and is moved and positioned by a Z-axis servo motor 4 via a pole nut screw (not shown). Furthermore, a headstock 5 is fixed on the lower headstock 3, a main spindle 6 is rotatably supported on the headstock 5 by a plurality of bearings, and a collet chuck 7 for gripping the outer diameter is attached to the tip of the main spindle 6. The headstock 5 is operated by a built-in motor that rotates and indexes the spindle 6 and detects the rotation angle of the spindle 6.
A pulse generator 8 that outputs to C is built-in.

An X-axis fixed stand 10 having a guide surface 10a in the X-axis direction is fixed on the right side of the base 1, and a tool rest 11 is movably placed on the X-axis fixed stand via a hydrostatic bearing. A lead processing unit is moved and positioned by an X-axis servo motor 12 via a pole nut screw (not shown), and is covered with a cover 14 on a mounting surface 11a having a plurality of T grooves provided on the top surface of the tool post 11. 15 is installed.

The unit body 16 of the lead processing unit 15 is shown in Fig. 3~
As shown in FIG. 5, it is mounted on the mounting surface tia so that its position can be adjusted in the X-axis direction, and has a rectangular guide 16a in the X-axis direction with a guide surface inclined by 450 degrees, and a static pressure pocket 16b is carved in the rectangular guide 16a. Pressurized oil is supplied into the static pressure pocket 16b through a fixed throttle unit 13 fixed to the side surface of the unit main body 16.

Furthermore, the upper surface of the unit body 16 has flange portions 16c at both ends.
, 16d, and a central plane 16e is open at the top of the square guide 16a, an upper plate 17 having a square hole is fixed on the plane 16s, and a hollow slide sleeve 18 is placed inside the square guide 16a as a hydrostatic bearing. It is inserted so that it can be moved smoothly without any play. Right end surface 16f of unit body 16
A servo motor 20 is fixed to the servo motor 20 via a mounting base 19, a ball screw 22 is connected to the output shaft 20a of the servo motor 20 via a camp ring 21, and a pole nut 23 screwed onto the ball screw 22 is attached to the slide sleeve 18. The slide sleeve 18 is fitted onto the right end portion and driven by the servo motor 20.

Furthermore, a mounting plate 24 that passes through a square hole in the upper plate 17 is fixed to the upper surface 18a of the slide sleeve 1B, and a position detection linear scale 25 fixed to the left side of the upper plate 17 is attached to the mounting plate 2.
A moving part 25a fixed on the servo motor 20 and moving together with the slide sleeve 18 outputs a position detection signal to the NC, and a tacho generator 26 is provided at the right end of the servo motor 20 to output a speed detection signal to the NC. Furthermore, the cutting tool 2 is attached to the cutting tool holder 27 fixed to the tip of the slide sleeve 18.
8 is removably attached. Note that the guide for moving the slide sleeve of the unit body is not limited to a 45° inclined guide surface, but may also be a rectangular guide having horizontal and vertical guide surfaces as shown in FIG.

A workpiece is gripped by the collet chuck 7 at the tip of the working metal spindle 6, the cutting tool 28 is attached to the cutting tool holder 27 of the lead processing unit 15, and cam cutting is about to start.

When the Z-axis servo motor 4 is rotated, the headstock 5 movably mounted on the Z-axis fixed base 2 is moved in the X-axis direction via a static pressure bearing, and at the same time, the X-axis servo motor 12 is rotated. The tool post 11, which is movably placed on the X-axis fixed base 10 via a static pressure bearing, moves in the X-axis direction and is positioned at the cutting start position, and the main shaft 6 is rotated by the built-in motor.
The pulse generator 8 outputs the rotation angle of the main shaft to the NC.

When the servo motor 20 of the lead processing unit 15 is rotated, the ball screw 22 rotates and the slide sleeve 18 moves via the pole nut 23, and the moving part 25a fixed to the slide sleeve 18 via the mounting plate 24 moves. Then, a position signal is output from the linear scale 25. Based on this position signal and the spindle indexing signal of the pulse generator 8, the position of the slide sleeve 18 with respect to the spindle rotation angle is driven while maintaining a predetermined relationship recorded in the NC program, and the rotation direction of the servo motor 20 is reversed at the moving end. The slide sleeve then repeats reciprocating motion with a predetermined amplitude. The moving speed of the slide sleeve 18 is controlled to a predetermined speed by an output signal from a tacho generator 26 provided at the rear end of the servo motor 20.

Next, cutting feed in the two axes of the headstock 5 and minute movement of the tool post 11 in the X-axis direction are performed at the same time, and the bit 28 at the tip of the slide sleeve moves the minute taper and cam lead surface of the tape running surface of the workpiece. Cutting is performed. When cutting is finished, the tool rest 11 is moved in the X-axis direction and the headstock 5 is moved in the X-axis direction to position the workpiece at a predetermined workpiece attachment/detachment position, and the workpiece is attached and detached, and the machining is repeated again with the above-mentioned operations. It will be done.

Effects As detailed above, the present invention provides a headstock that incorporates a built-in motor that rotates and indexes the main spindle so that it can be moved and positioned in the X-axis direction via a hydrostatic bearing, and a tool rest that is movable and positioned in the X-axis direction via a hydrostatic bearing. A lead processing unit is provided on the tool rest with a tool holder at the tip of the slide sleeve that can be moved in the X-axis direction via a hydrostatic bearing, and the slide sleeve is moved to the rotation angle of the main shaft. In addition, since it is driven by a servo motor, the inertia force is reduced by the hydrostatic bearing and the weight of the moving body is reduced, making it possible to perform minute movements without stick-slip, allowing high-precision cam cutting and minute taper cutting to be performed at high speed. This has the effect of improving processing efficiency.

[Brief explanation of the drawing]

Fig. 1 is a top view of the lead cam processing machine of the present invention, Fig. 2 is a side view of the lead cam processing machine of the invention, Fig. 3 is a front view of the lead processing unit, and Fig. 4 is a top view of the lead processing unit. , Fig. 5 is a side view of the lead processing unit, Fig. 6 is a side view of the lead processing unit with square guides as horizontal and vertical guide surfaces, Fig. 7 is a perspective view of the workpiece, and Fig. 8 is a diagram of the prior art. It is an explanatory diagram. 1... Base 5... Headstock 6... Main spindle 11... Turret 18... Slide sleeve 27... Bit holder

Claims (1)

[Claims] (1) A headstock movably provided on the base in the Z-axis direction, a first hydrostatic bearing that supports the headstock, a first driving member of the headstock, and a headstock that is rotatably mounted on the headstock. A bearing-supported main shaft, a second driving member that rotates and indexes the main shaft, a tool rest provided on the base so as to be movable in the X-axis direction, and a second hydrostatic bearing that supports the tool rest. a third driving member of the tool post; a lead processing unit having a cutting tool holder at the tip of a slide sleeve provided on the tool post and movable in the Z-axis direction; and a third hydrostatic bearing that supports the slide sleeve. A lead cam processing machine comprising: a fourth driving member for the slide sleeve; and an NC device for controlling each of the driving members.