JP2541217B2 - Shaft processing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a shaft body processing method.

[Prior Art] Rolls are used for rolling in various rolling equipments. For example, when the temperature of the rolls is different from room temperature,
Deviation of thermal expansion or contraction, that is, roundness of roll due to strain,
The cylindricity is deviated, and the roll is bent axially within the elastic deformation, and this bend appears as a runout when the roll is rotated. For example, in a calender, when rolling is performed in a state where the above-described runout occurs on the calender roll, as shown in FIG. The yield deteriorates with the deterioration. Further, in addition to such thickness accuracy, uniformity accuracy of patterns, color patterns and the like is also impaired.

Therefore, conventionally, as a method of preventing the above-described distortion, a method of making the material of the shaft body completely uniform, or processing the shaft body at a working temperature state has been considered.

[Problems to be Solved by the Invention] However, for example, when the operating temperature is high (in the case of a polyvinyl chloride calender, about 180 to 220 ° C.), the method of heating the shaft, the temperature retention, and the uniformity (temperature unevenness) ), It is difficult to put into practical use due to problems such as handleability, safety, and the degree of heat influence on the processing machine.In general, processing accuracy at room temperature is used as is, or a certain accuracy standard is used. In some cases, a product that exceeds the standard is provided and is diverted to another application, and the deterioration of product quality and yield remains a problem.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a shaft body processing method capable of improving product quality and yield when the shaft body is used for a rolling roll.

[Means for Solving Problems] In the present invention, the required shaft body is heated or cooled to a temperature similar to that during use, and the strain of the shaft body at that time is predetermined in the circumferential direction at a plurality of longitudinal positions. Then, the temperature of the shaft is set to a temperature different from that during use, and the strain of the shaft at that time is set to the same temperature as during use. In addition, the difference in strain under the same temperature as during use and at a temperature different from that during use is obtained, and the strain is applied to the shaft at a temperature different from that during use so that the strain becomes zero under the temperature during use. The shaft body is machined to give a difference.

[Operation] Even if there is strain in the shaft body at a temperature different from that during use, the strain of the shaft body becomes substantially zero at any position in the longitudinal direction of the shaft body under the temperature during use, and thus the true value is obtained. The circularity and cylindricity are improved, and the shake can be prevented even during rotation under the temperature during use.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

First, the processing procedure according to the method of the present invention will be described with reference to FIG.
This will be described with reference to (D).

FIG. 1 (A) shows a shaft body 1 having an arbitrary cross-sectional shape at room temperature.
The shaft body 1 is heated or cooled to a temperature at the time of use, and the strain 3 with respect to the virtual perfect circle 2 at that time is shown.
Is measured at each position in the circumferential direction (see FIG. 1 (B)).

After the measurement, the shaft 1 is returned to room temperature and the virtual perfect circle 2 at that time
Is measured at the same position where the strain 3 is measured (see FIG. 1C), and the difference between the measured value of the strain 3 under the temperature during use and the measured value of the strain 4 at room temperature is obtained after completion of the measurement. Grinding is performed on the non-perfect circle of the shaft body 1 so as to give the strain difference to the shaft body 1 at room temperature. After the working, if the shaft body 1 is kept at a working temperature, a true circular shaft body 1 having no distortion is obtained as shown in FIG. 1 (D).

As shown in FIG. 2, the measurement of the strain of the shaft body 1 is performed at predetermined intervals in the circumferential direction at the required longitudinal positions X ₁ , X ₂ , ... X _i , ... X _n of the shaft body 1.

As shown in FIGS. 3 (A) and (B), the shaft 1 at the position X _i at the time of use, at the temperature in use, has a strain δ _{i1 at} a predetermined position in the circumferential direction, and the shaft at the same position when returned to room temperature. When the strain of 1 is δ _i2 , the strain difference Δδ is represented by Δδ = Δδ _i1 −Δδ _i2 . Thus, the shaft body 1 is subjected to non-round grinding so as to give this strain difference Δδ at room temperature.

Explaining the specific means for performing the machining, after obtaining the difference in strain at predetermined intervals in the circumferential direction at each longitudinal position X _{1 to} X _n of the shaft body 1, as shown in FIG. One end of the shaft 1 is rotatably supported by the chuck 6 of the rotating device 5 and the other end thereof is supported by the rotating center 7, and the rotation surface of the shaft 1 is detected by the phase detector 8. In response to a control signal, the shaft is kept at room temperature by means of a grinding device 11 which is movable on a guide 10 arranged in parallel with the rotating shaft of the shaft 1 and can be moved toward and away from the shaft 1 in the radial direction. The body 1 is ground.

As described above, when the shaft body 1 processed into a non-round shape at a temperature different from the temperature at the time of use is kept at the temperature at the time of use, the shaft body 1 has a perfect circular cross-sectional shape, and the cylindricity is improved. The swing of the is also gone. Therefore, when this is used as, for example, a calendar roll, a product of good quality can be obtained with good yield.

As the processing means used in the present invention, various means such as grinding, polishing, and cutting can be applied, the shaft body may be hollow, and the temperature different from the time of use may be other than room temperature. Of course, various other changes can be made without departing from the scope of the present invention.

[Effects of the Invention] According to the shaft body processing method of the present invention, it is possible to process a shaft body having good roundness and cylindricity under a use condition and having little fluctuation at any position in the longitudinal direction of the shaft body. Therefore, it is possible to easily obtain a high-precision roll under the use conditions, and it is possible to reduce the cost of the apparatus and the product quality such as the thickness accuracy of the rolled material is improved, and the yield is also improved. Can play.

[Brief description of drawings]

1 (A) to (D) are schematic views showing a processing procedure by the method of the present invention, FIG. 2 is an explanatory view showing a measurement position of a shaft body, and FIGS. 3 (A) and (B) are measurement positions. Explanatory drawing showing the relationship with the amount of strain of the shaft body, FIG. 4 is an explanatory view showing the grinding device for the shaft body, and FIG.
The figure is a diagram showing the shape of the material rolled by the shaft in which the strain has occurred. 1 is a shaft, 5 is a rotating device, 8 is a phase detector, 9 is a control device, and 11 is a grinding device.

Front page continuation (72) Inventor Takayoshi Takayoshi, 1 Shinshinarahara-cho, Isogo-ku, Yokohama City, Ishikawashima Harima Heavy Industries Ltd. Technical Research Institute (72) Inventor Masashi Suzuki, 1 Shinshinarahara-cho, Isogo-ku, Yokohama Ishikawajima Harima Heavy Industries Co., Ltd. Company Yokohama second factory (56) Reference JP-A-58-181549 (JP, A) JP-A-59-129644 (JP, A)

Claims (1)

(57) [Claims] 1. A required shaft body is heated or cooled to a temperature similar to that at the time of use, and the strain of the shaft body at that time is measured at a plurality of positions in the longitudinal direction at predetermined intervals in the circumferential direction. When the body is set to a different temperature from the time of use, the strain of the shaft at that time is set to the same temperature as the time of use, and the strain is measured at the same position where the strain is measured. And, calculate the difference in strain under a temperature different from the time of use, and process the shaft so as to give the strain difference to the shaft under a temperature different from the time of use so that the strain becomes zero under the temperature of time of use. A shaft body processing method characterized by the above.