JPS59118301A - Crankshaft processing device - Google Patents

Abstract

PURPOSE:To improve the accuracy of processing the titled device of simple structure by a method wherein the indexing of the phase of a work and the indexing of the work in the longitudinal direction are performed by mechanisms independent of each other, respectively, and the work is processed with a bite rotatable about the work which is held stationary. CONSTITUTION:In a device for processing a pin or a journal of a crankshaft, a chuck 7 for clamping both ends of the work 6 with a chuck 5 fixed to the upper part of a sadle 2 is provided at one end of an indexing shaft 4. Further, an indexing slide 15 is screwed at the lower part by a screw rod 17 which is rotated by an X-axis motor 16 and is made movable in the X-direction running parallel to the axis of the work 6 by the motor 16. In addition, a rotary drum 22 enclosing the work 6 is supported on the upper part of a slide table 20 through a bearing 23. Thus it is possible to improve the accuracy of processing by the device of simple structure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a processing device for processing pins and journals of crankshafts.

Conventionally, when machining crankshafts used in internal combustion engines, etc., the workpiece to be machined is chucked at both ends, and when machining a journal, the workpiece is rotated around the journal.
When machining pins, the workpiece is rotated around the pin and the journal or pin is machined, respectively. However, in the case of a crankshaft used in a three-cylinder internal combustion engine, each pin is in the same phase, so it is necessary to set up three machining stations to machine each pin, or to index the phase of the workpiece. There is a need. Providing three processing stations requires the use of multiple processing devices, which increases equipment costs. In addition, in the method of phase indexing the workpiece, it is necessary to process crankshafts of different lengths using the same processing device, so it is necessary to match the phase indexing and the stroke of the crankshaft, and the indexing mechanism is The problem was complicated and expensive.

This invention was made for the purpose of improving such problems, and the phase indexing and longitudinal indexing of the workpiece are performed by independent indexing mechanisms, and a cutting tool rotates around the fixed workpiece. The present invention provides a crankshaft machining device for machining a workpiece, which enables highly accurate crankshaft machining with a simple configuration.

An embodiment of the present invention will be described below in detail with reference to the drawings. In the drawing, 1 is a bed, and a pair of saddles 2 are installed on the upper surface of both ends of the bed 1. An indexing shaft 4 is rotatably supported on the upper part of one saddle 2 via a bearing 3, and one end of this indexing shaft 4 is connected to the other saddle 2.
A chuck 7 is provided which clamps both ends of the workpiece 60 with a chuck 5 fixed to the upper part.

A pinion 8 is mounted inside the saddle 2 on the other end side of the indexing shaft 4.
and a lock plate 9 are provided. A rank 10 provided movably in a direction perpendicular to the index @ 4 is meshed with the pinion 9. By moving this rank 10 by an index drive source (not shown), the index shaft 4 is indexed. In addition, the lock plate 9 has a pin hole 9a at the index position, and a lock pin I2, which is moved forward and backward by the drive cylinder 11, is inserted into the pin hole 92. This allows the indexing shaft 4 to be fixed at the indexing position.

On the other hand, on the bed 1 located between each of the saddles 2, there is an index slide 15 movable in the longitudinal direction (X axis) of the bed 1.
is provided. The lower part of the indexing slide 15 is screwed onto a threaded rod 17 that is rotated by an X-axis motor 16, and is movable in the X-axis direction parallel to the axis of the workpiece 6 by the X-axis motor 16. A rest support arm 18 is erected from the end of the index slide 15, and a rest 19 is provided at the upper end of the rest support arm 1g to support the journal 6a or the punching pin 6b adjacent to the processing position of the workpiece 6 from below. There is.

Further, a slide table 20 is provided on the index slide 16 so as to be movable in the Y-axis direction perpendicular to the X@. The lower part of the slide table 210 is screwed to a screw rod 21 rotated by a Y-axis motor (not shown), and is movable in the Y-axis direction by the Y-axis motor. A rotating drum 22 is provided so as to surround the periphery of the rotary drum 22 and is supported via a bearing 23 .

A gear 24 is provided on the outer periphery of the rotating drum 22, and a gear 26 of a drum drive motor 25 provided on the slide table 20 side is meshed with this gear 24, and the drum drive motor 25 drives the rotating drum 22. In addition to being rotationally driven, the toothed gear 28 provided in the differential mechanism 27 is also meshed with the gear 24 . The input shaft 27a of the differential mechanism 27 is connected to a tool feed motor 29 provided on the slide table 20 side, and the output shafts 2.7. A gear 31 that meshes with a gear 30 rotatably supported on the rotating drum 20 is attached to b. The gear 30 is interlocked with a feed screw 33 via a gear train 32 that transmits the rotation of the cutting tool feed motor 29. The feed screw 33 is connected to a tool rest 34 that is movably supported in the radial direction of the rotating drum 200, and is connected to a tool rest 34 that is movably supported in the radial direction of the rotating drum 200.
This moves the tool rest 34 in the direction toward and away from the workpiece 6, and a cutting tool 35 for cutting the workpiece 4 is attached to the side of the workpiece 6 of the tool rest 3A. Note that 36 in the figure is a chip discharge hole.

Next, to explain the operation, before the workpiece 6 to be machined is clamped between the chucks 5 and 7, the machining position is indexed by the rotation of the indexing shaft 4.・Clamped at 7.

Next, the indexing slide 15 is moved in the X-axis direction by the indexing motor 16, and the workpiece 6 is indexed in the longitudinal direction, and the rest 19, which had been left open to avoid interference after indexing, is adjacent to the processing location. The journal portion 6a is supported from below.

Next, the slide table 20 is moved by the Y-axis keyer so that the center of the rotating drum 22 is aligned with the center of the processing section. When each indexing is completed, the rotary drum 22 is rotated by the drum and sliding motor 25, and the differential mechanism 28, gears 31 and 30, and gear train 3 are rotated by the tool feed motor 29.
The tool rest 34 is sent to the workpiece 6 via the tool rest 2 and the feed screw 33, and the workpiece 6 is processed by a cutting tool 35 attached to the tool rest 34. When the machining of the workpiece 6 is completed, the cutting tool 35 moves back and the rotary drum 22 also stops, and the next machining position is determined by the same operation as above, and the above operation is continued until all machining parts are completed. is repeated.

As described in detail above, this invention performs phase indexing of the workpiece and indexing in the stroke direction using independent indexing mechanisms, so indexing can be performed with a simple configuration, and a single device Equipment costs are also reduced because machining parts with different phases can be machined. Also, with the workpiece fixed,
In addition, since the rest can support and process the journal or pin adjacent to the workpiece, even workpieces with low rigidity do not generate vibrations during machining, allowing efficient and highly accurate machining.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic configuration diagram, and FIG. 2 is a view taken along the line tt-n in FIG. 1. 1 is the bed, 2 is the saddle, 5 and 7 are the chucks, 6 is the warp, 15 is the index club. id, 16 is the X-axis motor,
20 is a slide table, 22 is a rotating drum, 34 is a tool rest, and 35 is a cutting tool. Applicant Komatsu Ltd. Representative Patent attorney Masaaki Yonehara Patent attorney Tadashi Hamamoto 7F, 2nd floor

Claims (1)

[Claims] Saddles 2 are provided at intervals on the bed 1, and one of the saddles 2 includes an indexing means for indexing a workpiece 6 to be processed in the phase direction, and a chuck 7 indexed and rotated by the indexing means. In addition, the other saddle 2 is provided with a chuck 5 that clamps both ends of the workpiece 60 between the chuck 7 and an index slide 15 that is movable in the X-axis direction by an X-axis motor 16 between these saddles 20. A slide table 20 is provided on the index slide 15 and is movable in the Y-axis direction perpendicular to the X-axis.
Crankshaft machining in which a rotary drum 22 is rotatably provided to surround the workpiece 6, and a J-cut 35 is attached to a tool rest 34 supported on the rotary drum 22 so as to be movable in the radial direction. Device.