JPS596994Y2 - Burnishing roller device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to an apparatus that is used to perform roller burnishing on workpieces such as the pin portion and journal portion of a crankshaft for an engine.

Originally, in this type of machining, it is preferable to obtain a workpiece in a convex shape, and conventionally, in preparation for this, in this type of equipment, a method is used in which a burnishing roller that comes into contact with the workpiece is prepared in advance in a concave shape. In general, it takes a considerable amount of effort to prepare the roller in the shape,
Furthermore, the back-up roller on the rear side also requires approximately the same number of steps, and thus the entire device is relatively complicated and expensive, which is an inevitable disadvantage.

The purpose of the present invention is to obtain a device free of such inconveniences, and a front burnishing roller consisting of a straight roller that comes into contact with the outer peripheral surface of a shaft-shaped workpiece a is attached to the tip of a main body 1 that can move forward and backward. 2, and a pair of rear back up rollers 3, 3 which support both ends of the roller 2 from the back surface thereof, are each rotatably mounted on a shaft.

The drawing shows a case where workpiece a is a pin part of a crankshaft, and the pin part is aligned with its center axis X-
The drive revolves around the X.

The main body 1 has a plate-shaped bracket 4 fixedly bulging in an arc shape on its tip surface, and has a transparent window 5 in the middle thereof, into which the burnishing roller 2 is fitted and supported. Further, the main body 1 is provided with a shaft 7 rotatably supported by a twenty dollar bearing 6 at the rear thereof,
A pair of back up rollers 3, 3 are fitted and connected to both ends thereof.

To explain its operation, to process the workpiece a, it is rotated while the main body 1 is advanced to press the roller 2 at its tip against the circumferential surface of the workpiece a. In this case,
Since the back surface of the roller 2 at both ends thereof is pressed by a pair of back up rollers 3, 3, a more or less arc-shaped curvature is produced in this, and thus the circumferential surface of the workpiece a is shaped according to this curvature. Processed into a medium convex shape.

In this way, according to the present invention, the burnishing roller 2, which is a straight roller that comes into contact with the outer peripheral surface of the shaft-shaped workpiece a, is supported by a pair of back-up rollers 3, 3 from the back side of both ends of the burnishing roller 2. When the straight roller 2 is brought into pressure contact with the workpiece a, it is somewhat curved and a correspondingly convex finished surface can be obtained on the circumferential surface of the workpiece a, and conventional rollers are prepared in advance in a concave shape. This has the effect of eliminating the complicated machining of rollers and the complexity of supporting them in conventional rollers.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway plan view of one example of the proposed device;
The figure is a side view of the main parts. 1... Main body, 2... Burnishing roller, 3, 3... Back up roller.

Claims (1)

[Scope of utility model registration request] A front burnishing roller 2, which is a straight roller that comes into contact with the outer peripheral surface of the shaft-shaped workpiece a, is attached to the tip of the main body 1, which can move forward and backward.
and a pair of rear back-up rollers 3, 3 supporting both ends of the roller 2 from the back surface thereof, each of which is rotatably mounted on a shaft.