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Method of determing cold rolling expansion feeding speed

A technology of feed speed and cold rolling, which is applied in the field of ring cold rolling processing, can solve the problems of high cost, long process cycle of new products, lack of scientific basis, etc.

Inactive Publication Date: 2007-01-03
WUHAN UNIV OF TECH
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Problems solved by technology

At present, the determination method of the feed speed specification of the cold ring rolling machine is based on the repeated trial and error of the experiment and the accumulation of experience, which lacks scientific basis. Therefore, the process cycle of new products is long and the cost is high.

Method used

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  • Method of determing cold rolling expansion feeding speed
  • Method of determing cold rolling expansion feeding speed
  • Method of determing cold rolling expansion feeding speed

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specific Embodiment

[0081] The blank size is: R 0 =33.6mm, r 0 =23.9mm, radius R of the main roller 1 =103.61mm, core roll radius R 2 =17.14mm, peripheral speed v of the main roller R1 =1583.3mm / s (speed 146r / min), the wall thickness of the ring blank is 9.7mm, the wall thickness of the finished ring is 7.7mm, the cold rolling expansion friction coefficient μ=0.1, β=arctanμ.

[0082] Substituting the above data into equations (17)-(20), the extreme value of the diameter growth rate is obtained, D g min = 1.27 mm / s , D g max = 8.63 mm / s Substituting the two extreme values ​​into formula (13) respectively, two functions of the feed speed with respect to the wall thickness of the rolling ring are obtained, and the images of these two fu...

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Abstract

The method of determining cold rolling expansion feeding speed includes the following steps: 1. measuring the outer diameter and inner diameter of the ring blank, the radius of the main rolling wheel and the radius of the core roller; giving the main shaft rotation speed based on the cold rolling apparatus and calculating the circumferential speed of the main rolling wheel; finding out friction coefficient of cold rolling expansion based on the given ring product wall thickness; 2. calculating the minimum value Dmin and maximum value Dmax of diameter increase based on the given formulas; 3. substituting the minimum value Dmin and maximum value Dmax to one given expression; and 4. plotting two curves with the values of the step 3 and obtaining the cold rolling expansion feeding speed based on the range between these two curves. The present invention is accurate and simple.

Description

technical field [0001] The invention belongs to the field of cold rolling processing of ring parts, and in particular relates to a method for determining the feed speed in the cold rolling process. Background technique [0002] In the process of cold rolling, the feed rate is an important process parameter. Whether the feed speed is reasonable or not determines whether the rolling of the ring can be successful, and affects the shape accuracy and processing efficiency of the workpiece. At present, the determination method of the feed speed specification of the cold ring rolling machine is based on the repeated trial and error of the experiment and the accumulation of experience, which lacks scientific basis. Therefore, the process cycle of new products is long and the cost is high. Contents of the invention [0003] In view of the above shortcomings, the object of the present invention is to provide a simple and accurate method for determining the feed speed of cold rollin...

Claims

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Application Information

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IPC IPC(8): B21H1/00B21H9/00B21B5/00B21B37/00
Inventor 华林鄢奉林
Owner WUHAN UNIV OF TECH
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