CN101428297A - Section design method for sizing machine for casing tube with special through diameter - Google Patents
Section design method for sizing machine for casing tube with special through diameter Download PDFInfo
- Publication number
- CN101428297A CN101428297A CNA2008102444266A CN200810244426A CN101428297A CN 101428297 A CN101428297 A CN 101428297A CN A2008102444266 A CNA2008102444266 A CN A2008102444266A CN 200810244426 A CN200810244426 A CN 200810244426A CN 101428297 A CN101428297 A CN 101428297A
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- diameter
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- casing tube
- pass
- wall thickness
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Abstract
The invention provides a method for designing passes for a sizing mill with a special drift diameter, which ensures product dimensional accuracy and success of special drift diameter and remarkably improves percent of pass and yield of product. The method is characterized in that the diameter of the last finishing pass is subjected to the upper limit of the outer diameter of a casing with the special drift diameter (plus1%D), and the maximum diameter of the last finishing pass is calculated by plus of a contraction coefficient to plus1%D during design of passes; negative spread is used during design of passes; and the wall thickness is controlled according to the negative allowance of the wall thickness of the casing with the special drift diameter.
Description
(1) technical field
The present invention relates to seamless oil well steel tube restraint tandem rolling unit sizing mill and produce the processing method of machine for casing tube with special through diameter, be specially a kind of section design method for sizing of machine for casing tube with special through diameter.
(2) background technology
The section design method for sizing of existing machine for casing tube with special through diameter, measurement products size after the actual production of new PASS DESIGN need, the wall thickness, the external diameter that guarantee its product are not overproof, guarantee its latus rectum again, usually need to be used for producing through being specified to ripe pass after revising repeatedly, cause existing qualification rate lower in the exploitation of new product and the production process problem that lumber recovery is lower.
(3) summary of the invention
At the problems referred to above, the invention provides the special through hole type of a kind of sizing mill method for designing, guaranteed the product size precision, guarantee the success of special latus rectum, and significantly improved product percent of pass, lumber recovery.
Its technical scheme is such, it is characterized in that: the final pasxs diameter with the upper limit of the external diameter of machine for casing tube with special through diameter be as the criterion (+1%D), final pasxs diameter maximum adds on the basis according to+1%D when pass designs shrinks coefficient and calculates; Adopt the negative pass design of spreading; Wall thickness is according to the negative common difference control of the wall thickness standard of machine for casing tube with special through diameter.
The sizing mill pass of the designed machine for casing tube with special through diameter that goes out of the present invention has guaranteed the product size precision, has guaranteed the success of special latus rectum, and has significantly improved product percent of pass, lumber recovery.
(4) description of drawings
Fig. 1 is the graph of a relation between steel pipe, latus rectum gap and the latus rectum rod.
(5) specific embodiment
The final pasxs diameter with the upper limit of the external diameter of machine for casing tube with special through diameter be as the criterion (+1%D), final pasxs diameter maximum adds on the basis according to+1%D when pass designs shrinks coefficient and calculates; Adopt the negative pass design of spreading; Wall thickness is according to the negative common difference control of the wall thickness standard of machine for casing tube with special through diameter.
Below in conjunction with embodiment embodiments of the present invention are described:
244.5*13.84 machine for casing tube with special through diameter, its nominal diameter D is 244.5, wall thickness is 13.84, final pasxs diameter maximum adds on the basis according to+1%D when pass designs shrinks coefficient and calculates, the constriction coefficient of getting this material during design is 1.5%, get final product following calculating: 244.5*1.01=246.95,246.95*1.015=250.65, so as can be known, final pasxs diameter maximum can adopt 250.65mm; The guaranteeing of circularity adopted the negative pass design of spreading in pass design, getting its negative value of spreading when designing this pass is-0.01, become circular hole by oval groove after, ovality reduces, the body dimensional accuracy is improved; This machine for casing tube with special through diameter wall thickness tolerance is-10%～+ 10%, gets negative common difference control according to the wall thickness standard, and tandem mill is controlled in-10～0% scopes, and promptly corresponding 13.84 wall thickness are: 12.46～13.84mm.
After adopting the logical sleeve pipe of the rolling spy of this cover pass, qualification rate rises 46%, reaches 97.4%.
Said special path tube is the latus rectum rod than big a kind of to the strict more sleeve pipe of dimensional requirement of common latus rectum rod among the present invention.
Among Fig. 1,1 is that steel pipe, 2 is that latus rectum gap, 3 is drift-diameter rod.
Claims (1)
1, a kind of section design method for sizing of machine for casing tube with special through diameter, it is characterized in that: the final pasxs diameter with the upper limit of the external diameter of machine for casing tube with special through diameter be as the criterion (+1%D), final pasxs diameter maximum adds on the basis according to+1%D when pass designs shrinks coefficient and calculates; Adopt the negative pass design of spreading; Wall thickness is according to the negative common difference control of the wall thickness standard of machine for casing tube with special through diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102444266A CN101428297A (en) | 2008-12-03 | 2008-12-03 | Section design method for sizing machine for casing tube with special through diameter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102444266A CN101428297A (en) | 2008-12-03 | 2008-12-03 | Section design method for sizing machine for casing tube with special through diameter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101428297A true CN101428297A (en) | 2009-05-13 |
Family
ID=40644055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008102444266A Pending CN101428297A (en) | 2008-12-03 | 2008-12-03 | Section design method for sizing machine for casing tube with special through diameter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101428297A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699032A (en) * | 2012-06-01 | 2012-10-03 | 无锡西姆莱斯石油专用管制造有限公司 | Process for machining seamless steel pipe with special drift diameter by using slight-stretch reducing mill |
| CN109642293A (en) * | 2016-09-01 | 2019-04-16 | 新日铁住金株式会社 | Steel and Oil Well Pipe |
-
2008
- 2008-12-03 CN CNA2008102444266A patent/CN101428297A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699032A (en) * | 2012-06-01 | 2012-10-03 | 无锡西姆莱斯石油专用管制造有限公司 | Process for machining seamless steel pipe with special drift diameter by using slight-stretch reducing mill |
| CN109642293A (en) * | 2016-09-01 | 2019-04-16 | 新日铁住金株式会社 | Steel and Oil Well Pipe |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20090513 |