JPS63283850A - Working method for shaft body - Google Patents

Abstract

PURPOSE:To improve the quality and yield of a product in the case of use for rolling work by working a shaft body so that the strain becomes zero through heating and cooling to the temperature in use and carrying out the finishing work so that the strain is maintained by changing the temperature different from that in use. CONSTITUTION:One edge of a shaft body 1 is supported by the chuck 4 of a rotary device 3, and the other edge is supported by a rotary center 5, and grinding is performed by a grinder 9 which shifts on a guide 8 arranged in parallel to the rotary shaft and is approached and separated in the radial direction by receiving the signal supplied from a controller 7, detecting the revolution angle by a phase detector 6. Therefore, when the shaft body 1 is set at the temperature in use through heating and cooling, and the true circular from having the superior degree of cylinder in the state free from vibration in revolution is obtained through the grinding work so that the strain becomes zero. Through a strain is generated, when the temperature is changed to the normal temperature symmetrical shapes before and after working are obtained through the finishing work holding the strain shape. When the shaft body 1 is set under the temperature in use, the shape of the sectional surface becomes truly circular, and also the degree of cylinder is improved, and the deflection of revolution is eliminated.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a shaft processing method.

[Prior Art] Rolls are used for rolling in various rolling machines. For example, when the operating temperature of these rolls is different from room temperature, the roundness and cylindrical shape of the rolls may change due to deviations in thermal expansion or contraction, that is, distortion. This causes the roll to bend in the axial direction during elastic deformation, and this bending appears as runout when the roll is rotated. For example, in a calender, if the rolling operation is performed with the above-mentioned runout occurring in the calender roll, as shown in FIG. As the condition worsens, the yield decreases. Furthermore, in addition to such thickness accuracy, uniformity accuracy of patterns, color patterns, etc. is also impaired.

Conventionally, methods of preventing the above-mentioned distortion have been considered, such as making the material of the shaft completely uniform or processing the shaft at the operating temperature.

[Problems to be solved by the invention] However, for example, when the operating temperature is high (approximately 180 to 220°C in the case of a polyvinyl chloride calendar),
It is difficult to put it into practical use due to problems such as how to heat the shaft, temperature maintenance, uniformity (temperature unevenness), ease of handling, safety, heat influence on processing machines, and inability to obtain surface finish accuracy. In general, the processing accuracy at room temperature is used as is, or there are cases where a certain accuracy standard is set and products that exceed that standard are used for other purposes, and product quality and yield still remain. The problem was a decline in

In view of the above-mentioned circumstances, the present invention has been made with the object of providing a shaft processing method that can improve product quality and yield when the shaft is used, for example, in a rolling roll.

[Means for solving the problem] The present invention involves heating or cooling a required shaft body to a temperature similar to that at the time of use, and processing the shaft body so that the strain becomes approximately zero at that temperature.
The shaft is then returned to a temperature different from that during use, and the shaft is finished to maintain its distorted shape when returned.

[For production].

Even if the shaft body is distorted when the temperature is different from that during use,
Under operating temperatures, the distortion of the shaft becomes almost zero, improving roundness and cylindricity, preventing runout during rotation at operating temperatures, and providing a shaft with a smooth surface. .

[Example] Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

First, the processing procedure according to the method of the present invention will be explained.

The first prisoner shows a shaft l that has an arbitrary cross-sectional shape at room temperature, and the shaft l is heated or cooled to the operating temperature, and at that temperature the shaft l has zero strain. The shaft 1 is ground so that it is perfectly round and has good cylindricity and does not run out during rotation (see FIG. 1(B)), and then the shaft 1 is returned to room temperature. At this time, distortion occurs in the shaft l, but the entire shaft l is finished by grinding mAδ while maintaining the distorted shape as shown in Fig. 1 (C) and Fig. 2 at room temperature. The shaft l of is maintained in a similar shape before and after finishing. In FIG. 1(C), δ11. δ1□... indicates the distortion of the required interval θ with respect to the virtual perfect circle 2.

When the shaft 1 is placed under the operating temperature after finishing, the shaft 1 becomes a perfect circle without distortion, as shown in FIG. 1 (0).

When machining a perfect circle at a temperature similar to the operating temperature of the shaft body 1 and when machining a non-perfect circle at room temperature, it is necessary to measure the distortion of the shaft body l. This strain measurement is carried out at required positions X1, X2,...Xi in the longitudinal direction of the shaft l as shown in FIG.
, . . . Xn at predetermined intervals θ in the circumferential direction as shown in FIG.゛To explain the specific means for performing the processing, each position X1 in the longitudinal direction of the shaft l is
After determining the amount of strain at a predetermined interval θ in the circumferential direction for each of ~ A guide 8 is rotatably supported, and is disposed parallel to the rotation axis of the shaft l, while receiving a control signal from the control device 7 while detecting the rotation angle of the shaft l with a phase detector 8. A grinding device 9 that is movable above the shaft body l and capable of moving toward and away from the shaft body l in the radial direction is used to grind the shaft body l at the same temperature as during use or at room temperature.
processing.

As mentioned above, the shaft body 1 is machined into a perfect circle at the same temperature as when in use, and finished at room temperature so that the overall shape of the shaft body is maintained when the temperature is returned to room temperature. When kept under the temperature during use, the cross-sectional shape of the shaft l becomes a perfect circle, the cylindricity is improved, and there is no vibration during rotation. Therefore, when this is used, for example, as a calender roll, a product of good quality can be obtained with a high yield.

In addition, since the finishing process is carried out at room temperature, the surface precision and uniformity of the pattern, color, etc. of the product are further improved, and the quality is dramatically improved.

It should be noted that various processing methods such as grinding, polishing, and cutting can be used as the processing means used in the present invention, that the shaft body may be hollow, and that the temperature different from that during use may be other than room temperature. Of course, various other changes may be made without departing from the spirit of the present invention.

[Effects of the Invention] According to the shaft processing method of the present invention, it is possible to machine a shaft with good roundness and cylindricity and little runout during use, so it is possible to machine a shaft with high precision under the use conditions. It is easy to obtain, and the roll surface can be made smooth, which improves product yield and reduces manufacturing costs, as well as improves the thickness accuracy, surface accuracy, uniformity of patterns and color patterns, etc. of rolled materials.
Various excellent effects can be achieved, such as improving product quality.

[Brief explanation of drawings]

To Fig. 1 ~ (01 is a schematic diagram showing the processing procedure by the method of the present invention, Fig. 2 is an explanatory diagram showing the measurement position and strain state of the shaft body, and Fig. 3 is an explanatory diagram showing the grinding device of the shaft body. Figures 4 and 4 are diagrams showing the shape of the material rolled by the shaft where strain has occurred.l is the shaft, 3 is a rotating device, 6 is a phase detector, 7 is a control device, and 9 is a grinding device. Show the device.

Claims (1)

[Claims] 1) Heat or cool the required shaft to a temperature similar to that during use, process it so that the strain becomes approximately zero at that temperature, then return it to a temperature different from that during use, and check the shape of the shaft when returned. A shaft processing method characterized by finishing the shaft so as to maintain its distorted shape.