JPH0344450Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a roller machining device for a fillet portion of a workpiece such as a crankshaft.

Conventionally, as shown in FIG. 1, a conventional device of this type includes a rotatable back-up roller b having a guide portion a on the circumferential surface facing the fillet portion Wa of the workpiece W, and the guide portion of the back-up roller b A pressurizing roller c that is pressed against the fillet portion Wa of the workpiece W is rotatably supported, and the fillet portion Wa of the workpiece W is rotated by the driven rotation of the pressurizing roller c accompanying the rotational drive of the workpiece W. It is known that roller processing is applied to the entire circumference of the blade.

In this case, residual stress with a stress distribution as shown in the X-rays in FIG. 1 is formed in the fillet portion Wa at the contact portion of the pressure roller c, and the strength is improved, but the size of the fillet portion Wa If the precision is not strictly controlled, there will be a portion of the fillet portion Wa that is not in contact with the pressure roller C, as shown in the second diagram, and a large difference in internal stress will occur at the boundary between the pressure contact portion and the non-contact portion. , there is a risk of fatigue failure starting from this boundary.

In order to improve this inconvenience, Utility Model Application No. 56-115816 (Japanese Utility Model Publication No. 58-23235) was filed as a prior application.
A method was proposed in which the distance between the rotation axes of the back-up roller and the workpiece could be kept constant while changing the inclination angle of the pressure roller.
In this case, the guide portion of the back-up roller consists of a circumferential surface and a radiating surface adjacent to the circumferential surface, the circumferential surface being wavy, and the radiating surface having a waveform that becomes concave at the convex portion of the circumferential surface. Therefore, not only is it difficult to form, but the contact position of the pressure roller at the fillet part changes continuously, and such movement of the pressure roller causes slippage between the roller and the workpiece, resulting in roughening of the surface. There is a problem.

The object of the present invention is to provide an apparatus that solves such problems, and is equipped with a rotatable back-up roller 2 having a guide section 4 on the circumferential surface facing the fillet section of the workpiece. In a roller machining device for a fillet portion in which a pressure roller 5 which is pressed against a fillet portion of the workpiece is rotatably supported on a guide portion 4 of the prowler 2, the guide portion 4 of the back-up roller 2 is formed. The circumferential surface of the back-up propeller 2 is a circular circumferential surface 4a that is eccentric with respect to the axis of the back-up propeller 2, and a cross section passing through the guide portion 4 on the circumferential surface 4a is
The guide portion 4 is formed so as to be inclined with respect to the axis of the workpiece, and the pressure roller 5 has a contact shape that is substantially the same as the fillet portion of the workpiece.

Next, the present invention will be explained with reference to embodiments shown in FIG. 3 and below.

FIG. 3 shows an embodiment in which the present invention is applied to a roller machining device in which the workpiece W is used as a crankshaft and fillet portions Wa on both sides of the pin portion can be simultaneously roller-machined. Rotatably supported by shaft 3,
Each fillet portion Wa is attached to the back up roller 2.
Guide portions 4, 4 are formed on both sides of the circumferential surface facing the casing 1, and each guide portion 4 supports a pressure roller 5 in a rotatable manner.
When the casing 1 is moved forward toward the workpiece W by a cylinder (not shown) or the like, the pressure rollers 5 press against each fillet portion Wa of the workpiece W. It was made so that it was pressed against.

Although the above is not particularly different from that of the conventional device described above, according to the present invention, the back-up roller 2
The circumferential surface forming each guide portion 4 is a circular circumferential surface 4a whose center B is eccentric with respect to the axis A of the back-up roller 2, and a cross section passing through the guide portion 4 is formed on the circumferential surface 4a. The guide portion 4 was formed so that the point C was inclined with respect to the axis of the back-up roller 2.

Next, to explain the operation, the workpiece W is
When the pin portion is driven to rotate around the axis indicated by line D in the figure, the pressure roller 5 that is in pressure contact with the fillet portion Wa is driven to rotate, and the back-up roller 2 is also rotated accordingly. However, according to the present invention, due to the eccentricity and inclination of the guide section 4 of the back-up roller 2, the pressure roller 5 rolling on the guide section 4 can be moved against the workpiece. Based on the surface of contact with the fillet portion Wa on the W side as a base point, the backing roller 2 moves in a tilting manner between the posture shown by the solid line in FIG. Accordingly, the pressure stress distribution in the fillet portion Wa on the workpiece W side changes as shown by X' and X'' in Figure 4, and the residual stress after roller machining is distributed over a wide range as shown by X in the same figure. fillet area compared to conventional equipment
The strength of Wa is further improved.

Furthermore, even if a dimensional error occurs in the fillet portion Wa, according to the present invention, the contact position is automatically variably adjusted by tilting the pressure roller 5 in accordance with the shape of the fillet portion Wa, and the entire fillet portion Wa is fixed. Reliable roller machining is performed over the course of the process.

As described above, according to the present invention, due to the tilting of the pressure roller 5 due to the eccentricity and inclination of the guide portion 4 of the back-up roller 2, residual stress with a wide range of stress distribution is formed in the fillet portion Wa on the workpiece side, and the strength is increased. Further improvement is achieved, and even if there is a dimensional error in the fillet portion on the workpiece side, the tilting of the processing roller 5 performs roller processing over the entire fillet portion, thereby eliminating the disadvantages of the conventional device described above. However, the eccentricity and inclination of the guide portion 4 of the back-up roller 2 are easily formed because the circular circumferential surface 4a is eccentric with respect to the axis of the back-up roller 2. In addition, since the contact shape of the pressure roller 5 is made to be approximately the same shape as the fillet portion of the workpiece, the fillet portion does not move in the width direction, and a predetermined pressure can be applied by rolling contact. have

[Brief explanation of drawings]

Fig. 1 is a side view of the conventional device, Fig. 2 is a side view of the conventional device when a dimensional error occurs in the fillet portion on the workpiece side, Fig. 3 is a partially sectional side view of an example of the device of the present invention, and Fig. 4 is a side view of the conventional device. The figure is a side view of the main parts to explain its operation. W...work, Wa...fillet section, 2...
Backup roller, 4...Guide section, 4a...
Circular peripheral surface, 5...pressure roller.

Claims (1)

[Scope of utility model registration request] A rotatable back-up roller 2 having a guide portion 4 on the circumferential surface facing the fillet portion of the workpiece is provided, and the guide portion 4 of the back-up roller 2 includes:
In a roller machining device for a fillet portion in which a pressure roller 5 that is pressed against a fillet portion of the workpiece is rotatably supported, the circumferential surface of the back-up roller 2 on which the guide portion 4 is formed is pressed against the back-up roller 2. Circular peripheral surface 4a eccentric to the axis of No. 2
Then, the guide part 4 is formed on the circumferential surface 4a so that the cross section passing through the guide part 4 is inclined with respect to the axis of the back-up roller 2, and the contact shape of the pressure roller 5 is adjusted to match the fillet part of the workpiece. A roller processing device for fillet portions characterized by having substantially the same shape.