JP2529100B2 - Crank Shaft Mirror - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a crankshaft mirror for cutting a pin portion and a journal portion of a crankshaft used in an internal combustion engine or the like.

2. Description of the Related Art A crank shaft mirror for cutting a pin portion and a journal portion of a work by rotating a cutter around a work (a crank shaft) which is conventionally fixed, for example, Japanese Patent Laid-Open No. Sho 59
The one described in Japanese Patent No. 7514 is known.

In the one described in the above publication, a bed is provided with a carriage which is reciprocally moved in a vertical direction, and the milling unit is swingably supported by a swing pin on the carriage, and the milling unit is swingably supported by a swinging mechanism. It is configured to cut the pin portion and the journal portion of the work by a cutter provided on the slice unit while swinging.

Problems to be Solved by the Invention In the above-mentioned conventional crank shaft mirror, a milling unit is oscillatably supported, and a reciprocating table which moves up and down with the oscillating motion is movably supported in a vertical direction to thereby provide a cutting reaction force. Since it has a structure for receiving the structure, a strong bed is required to improve the manufacturing accuracy, and there are problems that the whole is large and heavy, and the price is high.

The present invention has been made for the purpose of improving the above-mentioned problems.

Means and Actions for Solving Problems In order to achieve the above object, the present invention is provided on a bed,
A saddle movably supported in a Z-axis direction parallel to the axis of a workpiece to be machined, and a slide supported on the saddle and movable in a horizontal (Y-axis) direction orthogonal to the Z-axis by a slide mechanism. A spindle head, one end of which is rotatably supported by the slide by a pin provided on the same plane as the work, and a slide provided so as to be located near the other end of the spindle head. A swing mechanism that swings the other end of the spindle head in the up-down (X-axis) direction around the pin, and a slide mechanism that is provided on the spindle head so as to be positioned approximately in the middle of the pin and the swing mechanism and that moves the slide. And a pin that supports the spindle head, which is composed of a rotary cutter that rotates the workpiece around the spindle head swing and cuts the workpiece. , Approximately half of the approximately the rotating cutter from that provided in the intermediate, the swing mechanism is cutting load of the swing mechanism that swings the spindle head to the vertical direction around the pin
It suffices to drive the spindle head with the driving force of (3), which enables downsizing of the swing mechanism and the slide equipped with the swing mechanism.

In addition, the small size of the slide enables high-speed operation, thus improving productivity.

First Embodiment A first embodiment of the present invention will be described in detail with reference to the drawings shown in FIGS. 1 to 5. In the drawings, 1 is a bed, and 2 beds (only one is shown in the drawing) on this bed 1. The saddle 2
Are movably mounted in the longitudinal direction (Z axis) of the bed 1, and the moving direction of the saddle 2 (Z axis) is placed on these saddles 2.
A slide 3 is supported so as to be slidable in the horizontal direction (Y axis) orthogonal to the.

The slide 3 is a base as shown in FIGS. 4 and 5.
A support wall 3b parallel to the moving direction is provided on 3a.

On the bottom surface of the base 3a, a liner 5 is fixedly fitted to two guide rails 4 laid on the saddle 2 in different steps.

A bearing hole 3d is formed at one end of the support wall 3b so that the center of the support wall 3b is located on the same horizontal line as the elliptical through hole 3c formed in the center of the support wall 3b.
A spindle head 6 to be described later is supported by a pin 7, and a case 3e for accommodating a swinging mechanism 8 to be described later is vertically provided on the other end side of the support wall 3b.

On the other hand, a ball nut 9 is fixed to the bottom of the slide 3 constructed as described above, and a ball screw shaft 11 of a slide mechanism 10 is screwed onto the ball nut 9.

The slide mechanism 10 has the ball screw shaft 11 supported in the Y-axis direction through a bearing 12 on a bearing portion 2a protruding from one end side of the saddle 2. One end side of the ball screw shaft 11 Is connected to a slide motor 16 via bevel gears 14 and 15 housed in a bevel gear box 13.

The slide motor 16 reciprocates the slide 3 in the Y-axis direction in synchronization with a swing mechanism 8 described later.

Further, the spindle head 6 pivotally attached to the bearing hole 3d of the slide 3 by a pin 7 has a substantially egg shape, and the workpiece is located at a position where the center thereof coincides with the through hole 3c opened in the support wall 3b of the slide 3. A circular hole 6a for inserting the 17 is opened, and a rotary cutter 18 is mounted around the circular hole 6a.
Supported by 19. The rotary cutter 18 is a bearing 19
With a structure in which a disk-shaped cutter body 18c having a cutting blade 18b at the center is provided on a drum 18a rotatably supported by a spindle head 6 by means of a gear 18d on the outer periphery of the drum 18. .

The gear 18d is meshed with an intermediate gear 20 supported on the spindle head 6, and the intermediate gear 20 is attached to one end of a rotary shaft 21 rotatably supported on the center of a pin 7 supporting the spindle head 6. Is meshed with the gear 22 that is formed. The other end of the rotary shaft 21 is projected from the end face of the pin 7 and a gear 23 is fixed to the end thereof. The gear 23 drives a cutter motor 25 mounted on the end face of the pin 7 via a motor mounting member 24. The rotary motor 18 is meshed with a gear 26 so that the rotary motor 18 is rotated by the motor 25.

Reference numeral 27 in the drawing denotes a counter balance mounted on the motor mounting member 24 so as to balance with the spindle head 6.

On the other hand, a projecting portion 6c projecting from the end of the spindle head 6 opposite to the support portion by the pin 7 is projected to the side of the case 3e of the slide 3, and one end of the shaft rod 30 is fixed to the tip portion. ing. The other end of the shaft rod 30 is projected into the case 3e, and a moving piece 31 is rotatably supported at a tip end thereof via a bearing 32, and the moving piece 31 is vertically movable in the case 3e. The guide member 33 is housed in the guide groove 33a of the guide member 33 via a linear bearing 34 so as to be slidable in the Y-axis direction.

A nut member 36 screwed to a ball screw shaft 35 provided in the longitudinal direction (X-axis direction) inside the case 3e is fixed to the guide member 33, and the nut member 36 is rotated in the X-axis direction as the ball screw shaft 35 rotates. It is designed to move up and down.

The upper and lower ends of the ball screw shaft 35 are supported by the slide 3 by bearings 37, and the bevel gear 38 of the rocking motor 39 is meshed with the bevel gear 38 mounted on the upper end of the ball screw shaft 35. Ball screw shaft 35 above
By rotating the spindle head 6 in the forward and reverse directions, the spindle head 6 can be swung in the X-axis direction around the pin 7 that supports the spindle head 6.

Next, the operation of the crank shaft mirror configured as described above will be explained. The work to be cut (crank shaft) 17
Both ends of the are clamped between the chucks 41a of the chuck base 41 installed on the bed 1 so as to face each other, and fixed so that the processed portions such as the pin portion and the journal portion coincide with the processing center O.

Then, the two saddles 2 are moved to the machining position in the Z-axis direction, and the motors 13 and 25 of the swing mechanism 8 and the slide mechanism 10 are moved in a state where both sides of the machined portion are supported by rest means not shown.
Is rotated synchronously by NC control.

The rotation of the slide motor 3 causes the ball screw shaft 11 to rotate in the forward and reverse directions via the bevel gears 15 and 14, whereby the slide 3 on the saddle 2 reciprocates in the Y axis direction at a constant cycle and swings. Bevel gears 40,3 by rotation of motor 39
The ball screw shaft 35 is rotated in the forward and reverse directions via 8, whereby the spindle head 6 is swung about the pin 7 in the X-axis direction at a constant cycle.

On the other hand, the rotation of the cutter motor 25 is transmitted from the gears 26 and 24 to the rotary shaft 21.
Is transmitted to the gear 22 through the intermediate gear 20, and further transmitted to the rotary cutter 18 by the intermediate gear 20 to rotate the rotary cutter 18, which is fixed between the chucks 41a by the combination of the movement of the slide 3 and the swing of the spindle head 6. The outer peripheral portion of the pin journal 17a of the workpiece 17 is turned to machine the outer peripheral surface of the pin journal 17a.

The horizontal load generated at this time is carried by the pin 7 supporting the spindle head 6, and the vertical load is carried by the pin 7 and the ball screw shaft provided in the X-axis direction.
35 will carry half each.

On the other hand, when the cutting of the pin journal 17a of the work 17 is completed by the above operation, the saddle 2 is moved to the next pin journal 17a.
The above operation is repeated and the cutting of all pin journals 17a of the work 17 is completed.

The cutting of the main journal of the work 17 is similar to the above, and therefore its explanation is omitted.

Further, FIG. 6 shows another embodiment in which the slide 3 is changed, and the slide 3 may be sized so as to accommodate the entire spindle head 6 as shown in this figure.

EFFECTS OF THE INVENTION As described in detail above, according to the present invention, the slide mechanism allows the slide to freely move in the horizontal (Y-axis) direction, and one end of the slide rotates to the slide by the pin provided on the same plane as the workpiece to be processed. A freely supported spindle head is provided, and at the other end side of the spindle head, a swinging mechanism for swinging the other end side of the spindle head in the up-and-down (X axis) direction about the pin is provided, and The spindle head, which is located approximately in the middle of the swing mechanism, is equipped with a rotary cutter that cuts the work. Since the pin and the swing mechanism share the load when cutting the work and support it, the drive force of the swing mechanism Is about 1/2 of cutting load.

As a result, the workpiece can be cut with a small driving force, and the size of the swing mechanism, the slide on which it is mounted, and the bed that supports the slide can be reduced to reduce the size of the entire device, thus reducing the cost of the crankshaft mirror. Like

In addition, the small size and light weight of slides enables high-speed operation, which shortens the processing time and improves productivity, and the smaller size of slides and beds increases the rigidity. As a result, the slide and bed are less likely to be deformed, so that highly accurate processing can be performed.

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a front view, Fig. 2 is a sectional view taken along the line II-II in Fig. 1, Fig. 3 is a lateral sectional view, and Figs. FIG. 6 is a perspective view of the slide, and FIG. 6 is an explanatory view showing another embodiment. 1 is a bed, 2 is a saddle, 3 is a slide, 6 is a spindle head, 7 is a pin, 10 is a slide mechanism, 17 is a work,
18 is a vine.

Claims (1)

(57) [Claims] 1. A saddle 2 movably supported on a bed 1 in a Z-axis direction parallel to the axis of a work 17 to be processed.
A slide 3 supported on the saddle 2 and movable by a slide mechanism 10 in a horizontal (Y-axis) direction orthogonal to the Z-axis, and a pin 7 having one end on the same plane as the work 17. A spindle head 6 rotatably supported by the slide 3 and a slide 3 located near the other end of the spindle head 6 and having the pin 7 at the other end of the spindle head 6. Swinging mechanism 8 for swinging the side up and down (X axis), and the pin 7
Is provided in the spindle head 6 so as to be positioned approximately in the middle of the swing mechanism 8 and the workpiece 17 is cut by rotating the workpiece 17 as the slide 3 moves and the spindle head 6 swings. A crankshaft mirror, comprising a rotating cutter 18.