JPH0818207B2 - Non-round machining method for shaft - Google Patents

Description

TECHNICAL FIELD The present invention relates to a non-round processing method for a shaft body (including rolls).

[Prior Art] Rolls are used for rolling in various rolling equipments, but when the operating temperature of the rolls is different from room temperature, deviation of thermal expansion or contraction, that is, distortion causes the roundness of the rolls to change,
Bending occurs in the axial direction of the roll within elastic deformation, and this bending appears as "run-out" when the roll is rotated. For example, in a calendar, when the rolling work is performed in a state where the above-mentioned "runout" occurs in the calendar roll, as shown in FIG. 6, irregularities are generated in the longitudinal direction of the rolled sheet a,
Since the range that can actually be used as a product is the range indicated by b, the thickness accuracy is deteriorated and the yield is reduced. 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-mentioned distortion, a method of making the material of the shaft body completely uniform, or processing at the operating temperature state has been considered.

[Problems to be Solved by the Invention] However, for example, when the operating temperature is high (about 180 to 220 ° C. in a polyvinyl chloride calender), the method of heating the shaft, the temperature retention, and the uniformity (temperature It is difficult to put into practical use due to problems such as unevenness), handleability, safety, and the degree of thermal influence on the processing machine. Generally, the processing accuracy at room temperature is used as is, or a certain accuracy standard is used. There is also an example in which a product exceeding the standard is provided for other purposes, and the deterioration of product quality and yield still remains a problem.

[Means for Solving Problems] The present invention has been made for the purpose of solving the above-mentioned conventional problems, and uses a shaft body whose cross-sectional outer shape is ground into a perfect circle at room temperature. Under the circumstance, the same strain as in the condition of use is generated in the shaft, and the strain at each position in the circumferential direction with respect to the true circle at each position in the longitudinal direction of the shaft is measured, and from the measured value of the strain, It is characterized in that a correction grinding amount to be given to the shaft body at normal temperature is obtained so that the strain under use condition becomes zero, and the correction grinding amount is obtained.

[Operation] By grinding the shaft to a non-round shape at room temperature without giving any special bending to the shaft, the cross-sectional external shape is a non-circular shape at room temperature Underneath, a shaft that becomes a perfect circle can be processed, and "runout" during rotation of the shaft can be prevented.

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

First, the processing procedure according to the method of the present invention is shown in FIG.
The outline will be described with reference to (D).

FIG. 1 (A) shows a shaft body 1 which is ground into a perfect circle at room temperature. As shown in FIG. 1 (B), the shaft body 1 is used under a usage condition or a condition corresponding to a usage condition. The strain 11 at each position in the circumferential direction with respect to the perfect circle 10 at that time is measured. After the measurement, based on the measured value, as shown in FIG. 1 (C), the shaft 1 is kept at room temperature so that the strain 11, that is, the deviation from the radius of the perfect circle 10 becomes zero under the use condition. Grind into a perfect circle. After processing, if the shaft body 1 is placed under a use condition, a perfect circle shaft body 1 is obtained as shown in FIG. 1 (D).

Next, the method of the present invention will be specifically described with reference to FIGS.

As shown in FIG. 2, the shaft body 1 ground so that its cross-sectional shape becomes a perfect circle at room temperature is placed in use, and the required positions X ₁ , X ₂ , ..., X _{i in} the longitudinal direction of the shaft body 1 are placed. Measure the strain in the circumferential direction for _Xn .

When the twist angle measured at any position X _i in each of the longitudinal directions is _i , as shown in FIGS. 3 and 4 (A), the angle θ from the circumferential reference position of the shaft 1 is θ. It was confirmed from the experimental results that the strain amount Δr _i at the position can be approximated by a sinusoidal curve. (The dotted line in FIG. 3 shows a sine curve when the torsion angle _i does not act).

When the maximum strain amount at this time is Δr _{i max} , the outer shape of the shaft body 1 may be a strain amount in the opposite direction as shown in FIG. The correction amount ΔR _i at the angle θ is defined by the following equation.

ΔR _i = −Δr _{i max} · sin (θ− _i ) After the correction amount ΔR _i is calculated for all the longitudinal positions X _{1 to} X _n of the shaft body 1, as shown in FIG. One end is rotatably supported by the chuck 4 of the rotation device 3 and the other end is rotatably supported by the rotation center 5, and the control signal from the control device 7 is transmitted while the rotation angle θ of the shaft 1 is detected by the phase detector 6. A grinding device 9 (or a cutting device) is provided which can be received and moved on a guide 8 arranged parallel to the rotation axis of the shaft body 1 and can be moved toward and away from the shaft body 1 in the radial direction. The body 1 is ground (cut).

The correction amount ΔR _i has positive and negative values. In this case, if the positive correction amount ΔR _i is defined as the grinding amount, the negative correction amount ΔR _i is a Since it is impossible to do this, it is impossible to do this. Therefore, when grinding the shaft 1 into a perfect circle at room temperature, the negative maximum value of the expected correction amount ΔR _i , that is, the meat The shaft body 1 is ground by a large amount for the extra amount, and after the measurement of the strain under the use condition is finished, by adding Δr _{i max} to the above-mentioned equation representing the correction amount ΔR _i , The correction amount ΔR _i to be ground is 0 at the maximum value position, and the correction amount ΔR _i is 2 at the maximum value position of the correction amount ΔR _i to be ground.
The shaft 1 is ground so that Δr _{i max} is reached, and a non-perfect circle is formed.

When the shaft body 1 ground to a non-round shape is placed under actual use conditions, the cross-sectional shape of the shaft body 1 becomes a perfect circle, and "runout" during rotation can be prevented.

Further, since the correction amount can be defined in the form of a function, it becomes extremely easy to input the correction amount to the grinding device.

The present invention is not limited to the above-described embodiment, and the correction amount is not limited to the function form and may be any value at any angle, or the shaft may be hollow. It goes without saying that various changes can be made without departing from the scope of the invention.

[Effects of the Invention] As described above, according to the present invention, the actual condition of use is achieved by grinding the shaft body to a non-perfect circle at room temperature without giving any special bending or the like to the shaft body. Below,
Since a shaft body having a cross-sectional outer shape of a perfect circle can be obtained, it can be applied to any shaft body, prevents "run-out" during rotation of the shaft body, and has high accuracy under use conditions. The roll can be easily obtained, the manufacturing cost can be reduced, the product quality such as the thickness accuracy of the non-rolled material can be improved, and the yield can be improved.

[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 FIG. 3 shows a relationship between an angle and a measured strain amount. The diagrams shown in FIGS. 4A and 4B are explanatory views showing changes in the outer shape of the shaft body,
FIG. 5 is an explanatory view showing a grinding device for a shaft body, and FIG. 6 is a view showing a shape of a material rolled by a shaft body in which strain has occurred. 1 is a shaft, 3 is a rotating device, 6 is a phase detector, 7 is a control device, and 9 is a grinding device.

Continuation of front page (72) Inventor Mitsu Ueda No. 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawajima Harima Heavy Industries, Ltd. Yokohama No. 2 Factory (56) Reference JP-A-51-90714 (JP, A)

Claims (1)

[Claims] 1. A shaft body whose cross-sectional outer shape is machined into a perfect circle at normal temperature is placed under use conditions to cause the same strain as that under use conditions, and each position in the longitudinal direction of the shaft body. The strain at each position in the circumferential direction with respect to the perfect circle is measured, and the corrected grinding amount to be given to the shaft body at room temperature is obtained from the measured strain value so that the strain under use is zero. A non-round machining method for a shaft body, which comprises grinding the shaft body so that the corrected grinding amount is given to the shaft body at room temperature.