JPS6232764Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a burnishing device used primarily for burnishing the pin portion of a crankshaft.

Conventionally, this type of device has a support shaft parallel to the axis of the workpiece above the workpiece setting position, and a machining head equipped with clamp arms on both sides of the lower end that clamps the workpiece via a burnishing roller is rotated on the support shaft. When the crankshaft is rotated with the pin part of the crankshaft, which is a workpiece, being clamped by the clamp arm, the machining head rotates around the pin part. There are known machines that rotate and move as the workpiece moves, but the machining head tends to vibrate because it is elastically supported by the bullet, and the clamp arm swings when setting the workpiece, causing the workpiece to set. This is accompanied by the inconvenience of interfering with the insertion of the pin portion between the clamp arms.

The purpose of the present invention is to provide a device with a simple structure that can position the machining head at a predetermined position when setting a workpiece, in order to eliminate such inconveniences. A machining head is equipped with a support shaft parallel to the axis of the workpiece, and a clamp arm on both sides of the lower end that clamps the workpiece via a burnishing roller. A support that is movable in parallel to the axis of the support shaft is provided above the support shaft, and a cross section of the support that changes in a plurality of steps in the direction of movement and opens downward on the lower surface of the support. A V-shaped concave groove is provided, and a contact part inserted into the concave groove is provided on the top of the machining head, and the upward elastic force of the bullet of the machining head is applied to the receiver through the part. The feature is that it is made to be received by the user.

Next, the present invention will be explained with reference to the illustrated embodiments.

In the drawings, reference numeral 1 indicates a machine base, and on the machine base 1, a center member 2 and a chuck member 3 for holding a crankshaft W, which is a workpiece, in a predetermined set position are provided.
A drive motor 4 connected to the chuck member 3 rotates the crankshaft W, and the machine base 1
A support 5 is provided on the top, and a support shaft 6 extending parallel to the axis of the crankshaft W is installed horizontally on the support support 5 above the set position. The machining head 8 was suspended so as to be vertically movable.

To explain this in more detail, the head 8 has the support shaft 6 on its upper side, as shown clearly in FIGS. 2 and 3.
A vertically movable guide frame 10 on the support shaft 6 is inserted into the bracket part 9 having a vertical elongated hole 9a through which the bracket part 9 is inserted. Furthermore, the head 8 is provided with a pair of clamp arms 11, 11 that can be opened and closed on both sides of its lower end, and the arms 11, 11 are connected via a toggle mechanism 12. is connected to a cylinder 13 provided in the head 8, and when the cylinder 13 is pushed downward, the arms 11, 11 are connected to the head 8.
Three sets of burnishing are arranged at the center of the lower end and the arms 11, 11 to apply a closing action toward the center of the lower end, and pinch the pin part W _P of the crankshaft W from three directions around it. roller 1
Equipped with 4.

In the drawing, reference numeral 15 indicates an elevating frame for elevating the crankshaft W to the set position.

Here, according to the present invention, a receiver 16 having a groove 16a having a substantially V-shaped cross section and opening downward as shown in FIG. A contact portion 17 is provided at the upper end of the machining head 8 to be inserted into the groove 16a, so that the upward elastic force of the bullet 7 is transmitted through the receiving portion 17. It was made to be received by tool 16.

In the illustrated example, the corresponding portion 17 is constituted by a roller at the top of the bracket portion 9.

Furthermore, in the illustrated embodiment, the receiver 16 is movable in the axial direction of the support shaft 6, and the groove depth of the groove 16a is changed in the axial direction in a plurality of steps, for example, two steps, as shown in FIG. did.

In the drawings, reference numeral 18 indicates a mounting frame for the support 16 installed horizontally at the upper end of the support column 5, and 16 indicates a shift cylinder for moving the support 16. Next, to explain its operation, first, the crankshaft W is placed on the lifting frame 15 in such a posture that the pin portion W _P is at the top dead center position, and then the lifting frame 15 is moved upward to move it to the set position. At this time, the pin part W _P is inserted between the clamp arms 11 and 11 on both sides of the lower end of the processing head 8 as shown in FIG. 8 is positioned at a neutral position along a line connecting the bottom of the groove 16a and the support shaft 6 by inserting the abutting part 17 at the upper end into the V-shaped groove 16a of the receiver 16. The pin portion W _P is reliably inserted between the clamp arms 11, 11 without causing contact therewith.

After that, the crankshaft W is attached to the center member 2.
and the chuck member 3, the clamp arms 11, 11 are closed, the pin part W _P is clamped by three sets of burnishing rollers 14, and then the crankshaft W is rotated. The pin portion W _P around the axis of the crankshaft W
As the machining head 8 rotates around the spindle 6, the machining head 8 rotates around the support shaft 6 and moves up and down, and the roller 14 burnishes the pin portion W _P.

In addition, when machining a crankshaft W with a different revolution radius of the pin part W _P , move the receiver 16 so that the contact part 17 is inserted into the part of the groove 16a with different groove depth, The height of the processing head 8 and thus the clamp arms 11, 11 in their neutral position is adjusted.

In this way, according to the present invention, the processing head is
When the workpiece is set, the upper end abutment part is inserted into the groove with a roughly V-shaped cross section formed in the upper receiver by the elastic force of the ammunition machine, and is positioned at a predetermined position, ensuring that the workpiece is inserted between the clamp arms. It is easy to set up, has a simple structure, and has the advantage of being inexpensive.

[Brief explanation of the drawing]

1 is a side view of the present device, FIG. 2 is a front view taken along the line -- in FIG. 1, and FIG. 3 is a side view taken along the line -- in FIG. 6... Support shaft, 7... Bullet machine, 8... Processing head,
11... Clamp arm, 14... Burnishing roller, 16... Receiver, 16a... Concave groove, 17...
Abutting part.

Claims (1)

[Scope of utility model registration request] A processing head is provided with a support shaft parallel to the axis of the workpiece above the horizontal setting position of the workpiece, and clamp arms on both sides of the lower end that clamp the workpiece via a burnishing roller are rotatably mounted on the support shaft. In a device that is suspended vertically through a support shaft, a support that is movable parallel to the axis of the support shaft is provided above the support shaft, and the lower surface of the support has a plurality of stages that change in the direction of movement. A concave groove with a substantially V-shaped cross section opening downward is provided, and an abutting part to be inserted into the concave groove is provided on the top of the machining head to absorb the upward elastic force of the elastic machine of the machining head. A burnishing processing device characterized in that the burnishing processing device is made to be received by the receiver via a hand portion.