CN2754758Y - Puncturing expanding head - Google Patents
Puncturing expanding head Download PDFInfo
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- CN2754758Y CN2754758Y CN 200420023170 CN200420023170U CN2754758Y CN 2754758 Y CN2754758 Y CN 2754758Y CN 200420023170 CN200420023170 CN 200420023170 CN 200420023170 U CN200420023170 U CN 200420023170U CN 2754758 Y CN2754758 Y CN 2754758Y
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Abstract
The utility model relates to a head for the rolling of seamless tubes, particularly a puncturing expanding head. The utility model solves the disadvantages that the loading of the head is large, and the head is damaged because the end is worn easily of the existing expanding head. The utility model which is a puncturing expanding head is characterized in that the utility model is formed by the circular arc-shaped transition of a puncturing segment, a transition and adjusting segment, an expanding segment, a rolling segment and a flat cone segment, wherein the surface curve of the puncturing segment is in the shape of a parabola; the transition and adjusting segment, the expanding segment, the rolling segment and the flat cone segment are all in the shape of a straight line, the circular arc transitional radiuses are R1, R2 and R3, the expanding segment is provided with a cone angle alpha< 1 >, and the rolling segment is provided with a cone angle alpha< 2 >. The utility model can satisfy the rolling of high wall thickness precision steel tubes.
Description
Technical field: the utility model relates to a kind of used to roll seamless steel tube top, and particularly a kind of perforation comes directly towards with big hole enlargement.
Background technology: existing perforating head shaped design adopts syllogic: bodkin section, backing awl section, flat awl section, fundamental figure as shown in Figure 1.Wherein the bodkin section adopts dome shape, finishes perforation and most hole enlargement task in the bodkin section, because the sphere top is violent in the flow of metal of bodkin section, the top load greatly, the top of causing easy to wear, end is damaged, so cab-over design is often adopted, d=20mm～30mm in the design in the end, top.And backing awl section adopts straight line design, angle a=perforating roller outlet section angle, 2 〉=2 times of pitch of length L.Problems such as this form top design is applied in the produced on-site, when carrying out big hole enlargement (enlarging rate 〉=1.2), but the hole enlargement ability occurs, and rolling load is too high, promptly surpasses the unit limit load, and the horizontal wall thickness of perforation hollow billet is of poor quality.The maximum pass of Baosteel Φ 140 unit original productions is 152.5, and the external diameter of maximum trimmed size is Φ 139.7mm, and the external diameter of perforation hollow billet is Φ 184mm, and the design of tradition top is adopted in the top design; After develop 169 passes, the external diameter of maximum trimmed size is Φ 159mm, the external diameter of perforation hollow billet is Φ 195mm, this top shape has been continued to use the design of top shape; In order further to expand range of product size, develop 189 passes, maximum trimmed size external diameter reaches Φ 180mm, require the perforation capillary outer diameter to reach more than the Φ 216mm, former top shaped design thinking is still continued to use in former perforating head design, though satisfied the production needs substantially, but mainly there is following deficiency in this top in the actual production: 1, hole enlargement is indifferent, rolling thick-walled pipe perforation capillary outer diameter only can expand to Φ 212mm, can not satisfy the rolling requirement of later process, though rolling thin-wall pipe perforation capillary outer diameter can expand the 216mm to Φ, deterioration parameter is adjusted in perforation, has sacrificed the wall thickness quality.2, the drilling/rolling load is high, near the unit limit load, can not satisfy the rolling requirement of high grade of steel steel pipe when rolling general pipe (material).3, the quality control of perforation hollow billet wall thickness is not good, and particularly the horizontal wall thickness extreme difference of light-wall pipe perforation hollow billet is big, can not satisfy the rolling requirement of high wall thickness accuracy steel pipe.
Summary of the invention: the utility model technical issues that need to address are: obtain a kind of top, can satisfy the requirement of the big hole enlargement of perforation, the external diameter of perforation hollow billet is reached 〉=Φ 216mm, and obtain hollow billet wall thickness accuracy preferably, can effectively reduce the drilling/rolling load simultaneously.
Design concept of the present utility model is: break through former top design concept, according to the deformation characteristics of top in each stage of perforation, to come directly towards shaped design is divided into five parts and designs: section, extension diameter section, backing section, flat awl section, main feature are adjusted in perforated section, transition:
1, change flat mouthful of end design of former top head, adopt sharp cone distal, the rolling load in the time of can effectively reducing the top secondary and nip improves the concentrated wearing and tearing of roll when secondary is nipped, and is beneficial to the rolling center of centrally aligned, top simultaneously, improves perforation hollow billet wall thickness quality.
2, change the pattern that former bus adopts the circular arc design at perforated section, bus adopts parabolic curve design, to alleviate the drastic deformation of metal in perforation procedure, alleviates rolling load.
3, be that balanced rolling load distributes, improves the top versatility, increase the top transition and adjust section.
4, emphasize the effect of extension diameter section top, this section top bus adopts the wide-angle straightway to design, to satisfy the needs of the big hole enlargement of perforation.
5, backing section changes the thought that former top design backing segment length needs 〉=2 times of pitch, guarantee 2 〉=1 times of pitch length of backing segment length length L, can reach the equal wall effect of backing, simultaneously in order to guarantee backing Duan Junbi effect, change the thought that former top rolling angle equals roll outlet section cone angle, guarantee in the design rolling angle bore a hole outlet section cone angle (Space Angle) big 40～50.
The technical solution of the utility model is: a kind of perforation comes directly towards with big hole enlargement, constitute by perforated section, transition adjustment section, extension diameter section, backing section, flat awl section arc-shaped transition successively, the top is sharp cone distal, the perforated section surface curve is a parabolic type, satisfy formula: x=a * y^b-c, transition adjustment section, extension diameter section, backing section, flat awl section are straight line, and transition R is followed successively by R1, R2, R3, the extension diameter section cone angle
1Generally get 9 °～13 °, backing section cone angle
2It is 2.5 °～5 °.And:
1) flat awl segment base does not originally participate in distortion, can adopt 20mm～30mm during this segment length can design.
2) backing awl section design, in order to shorten top length, to reduce top weight, this segment length by originally 〉=2 times of pitch change into 〉=1 times of pitch, guarantee that metal upwards can a rolling circle in backing section week, guarantee horizontal wall thickness quality.Simultaneously, suitably increase the wall thickness reducing amount of backing section to hollow billet in order to improve the equal wall effect of backing section, the rolling angle that guarantees top backing section bore a hole outlet section cone angle (Space Angle) big 40～50 be α
2It is 2.5 °～5 °.
3) clearly in the function of perforation procedure middle outlet section, the part that roll mouth degree and godet spacing are amplified gradually in correspondence perforation pass according to the required enlarging rate that reaches of perforation hollow billet, adopts big top outlet cone angle, i.e. α
1Generally get 9 °～13 °, make hollow billet reach bigbore purpose in this stage.
4) in order to relax the acute variation of metal in the perforation procedure, reduce the drilling/rolling load, in the middle of perforated section and extension diameter section, increase transition and adjust section, this section top bus adopts the horizontal line design, on the one hand balanced rolling load in the perforation procedure, the formulation of adjusting parameter for the rolling different wall perforation in same top has brought facility on the other hand, helps coming directly towards the seriation of specification, desirable 40mm～65mm in this segment length design.
5) perforated section top bus changes former circular arc design and adopts parabolic curve design, reduce the severe degree of perforation stage flow of metal, can effectively reduce rolling load, after adopting parabolic curve design simultaneously, the perforation secondary is nipped and is come directly towards load reduction greatly, can effectively solve top end heavy wear problem, so end, cancellation top cab-over design.This design can reduce nip rolling load in the process of perforation greatly, improves the perforation secondary ability of nipping.This section parabola parameter c decision perforated section length, c gets 110mm～130mm in the design; B decision parabola variation tendency, b gets 1.9～2.2 in the design; The span of x decides according to the c value that (0～c), a value can be determined after b, c determine.
The beneficial effects of the utility model:
Baosteel has successfully adopted above-mentioned top design, serial top φ 130mm, φ 134mm, φ 138mm, φ 142mm, φ 146mm, φ 150mm, φ 154mm, φ 158mm, φ 160mm, φ 164mm have been designed, and be successfully applied in the production reality, adopt the main effect behind this top to have:
● perforation hole enlargement ability promotes significantly; but the perforation capillary outer diameter maximum hole enlargement of light-wall pipe is to more than the φ 225mm; and for the perforation procedure adjustment provides bigger space, but the perforation capillary outer diameter maximum hole enlargement of thick-walled pipe has better been satisfied the needs that later process is produced to more than the φ 218mm.
● the drilling/rolling load reduces greatly, and the average rolling load of boring a hole descends 10%～15%, and maximum rolling load descends 8%～12%.
● the wall thickness accuracy of perforation hollow billet obtains bigger raising (laterally wall thickness accuracy), and average transverse wall thickness extreme difference descends about 10%.
Description of drawings:
Fig. 1 is existing hole enlargement top structure schematic diagram
Fig. 2 is the utility model structural representation
Among the figure: the 1-perforated section, section is adjusted in the 2-transition, 3-extension diameter section, 4-backing section, the flat awl section of 5-.
The specific embodiment:
With reference to Fig. 2, a kind of perforation comes directly towards with big hole enlargement, constitute by perforated section 1, transition adjustment section 2, extension diameter section 3, backing section 4, flat awl section 5 arc-shaped transition successively, the top is sharp cone distal, perforated section 1 surface curve is a parabolic type, satisfy formula: x=a * y^b-c, a, b, c are perforated section bus parabola parameter, and wherein: c gets 110mm～130mm; B decision parabola variation tendency, b gets 1.9～2.2 in the design; The span of x decides according to the c value that (0～c), a value can determine that promptly when x=c, y also is a definite value after b, c determine, can ask a value by formula x=a * y^b-c.φ D: expression top specification, decide according to drilling/rolling hollow billet target wall thickness, can select 2mm～4mm one retaining as the top specification.A1 is extension diameter section cone angle (getting 9 °～13 °), a2 be backing section cone angle (rolling angle of getting top backing section bore a hole outlet section cone angle (Space Angle) big 40～50) get 2.5 °～5 °.C, L1, L2, L3 represent each segment length of perforating head respectively, and wherein: c gets 110mm～130mm, and L1 gets 40mm～65mm, and L2 decides according to extension diameter section cone angle a1, top specification, L3 and top total length L, and L3 gets 〉=1 times of pitch, normally gets 80mm～120mm.R1, R2, R3 represent to come directly towards each section joining place transition arc radius respectively, and wherein: R1 gets 100mm～200mm, and R2, R3 get 300mm～400mm.R represents flat prostomum chamfering place arc radius, gets 10mm～15mm.
Embodiment:
Be 3.5 ° for the outlet cone angle and be perforating roller that as the top of need design φ 164mm, φ 160mm, φ 158mm, φ 150mm, φ 142mm, can adopt parameter as shown in the table to design, each parameter as shown in Figure 2 in the table.
| φD | a | b | c | R1 | R2 | R3 | R | a1 | a2 | L1 | L2 | L3 |
| 164 | 0.0229 | 2.1 | 118 | 120 | 300 | 300 | 15 | 9.5° | 4.25° | 60 | 97 | 85 |
| 160 | 0.0272 | 2.1 | 118 | 150 | 350 | 300 | 15 | 11.5° | 4.25° | 60 | 97 | 85 |
| 158 | 0.0283 | 2.1 | 118 | 200 | 300 | 300 | 12 | 11.5° | 4.25° | 60 | 97 | 85 |
| 150 | 0.0352 | 1.9 | 118 | 200 | 300 | 350 | 12 | 12° | 4.45° | 60 | 97 | 85 |
| 142 | 0.0460 | 2.2 | 120 | 250 | 300 | 300 | 10 | 13° | 4.45° | 40 | 90 | 110 |
For the outlet cone angle is 2.5 ° perforating roller, as the top of need design φ 164mm, φ 146mm, can adopt parameter as shown in the table to design, and each parameter as shown in Figure 2 in the table.
| φD | a | b | c | R1 | R2 | R3 | R | a1 | a2 | L1 | L2 | L3 |
| 164 | 0.0229 | 2.1 | 110 | 200 | 300 | 400 | 12 | 10° | 3.5° | 50 | 97 | 103 |
| 146 | 0.0395 | 2.2 | 110 | 180 | 350 | 350 | 12 | 12.5° | 3° | 49 | 106 | 95 |
Feasibility and prospect that expectation is applied: the utility model can be applicable on the domestic and international similar perforation unit, shape and the required perforation capillary outer diameter that reaches according to perforating roller, in the parameter designing scope that design is recommended, select relevant parameters, can design corresponding top, reach the utility model purpose that the present invention will reach.
Claims (5)
1, a kind of perforation comes directly towards with big hole enlargement, it is characterized in that: constitute by perforated section, transition adjustment section, extension diameter section, backing section, flat awl section circular arc transition successively, the top is sharp cone distal, the perforated section surface curve is a parabolic type, transition adjustment section, extension diameter section, backing section, flat awl section are straight line, arc transition R is followed successively by R1, R2, R3, and extension diameter section has cone angle
1, the backing section has cone angle
2
2, a kind of perforation according to claim 1 comes directly towards with big hole enlargement, and it is characterized in that: parabola satisfies formula: x=a * y^b-c, and c is a perforated section length, and c gets 110mm～130mm, and b gets 1.9～2.2, and x gets 0～c, and a value can be determined after b, c determine.
3, a kind of perforation according to claim 1 comes directly towards with big hole enlargement, and it is characterized in that: extension diameter section has cone angle
1Be 9 °～13 °, the backing section has cone angle
2It is 2.5 °～5 °.
4, a kind of perforation according to claim 1 comes directly towards with big hole enlargement, it is characterized in that: transition adjustment section is got 40mm～65mm, and the backing section is got 80mm～120mm, and flat awl section is got 20mm～30mm.
5, a kind of perforation according to claim 1 comes directly towards with big hole enlargement, and it is characterized in that: R1 gets 100mm～200mm, and R2, R3 get 300mm～400mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420023170 CN2754758Y (en) | 2004-05-28 | 2004-05-28 | Puncturing expanding head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420023170 CN2754758Y (en) | 2004-05-28 | 2004-05-28 | Puncturing expanding head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2754758Y true CN2754758Y (en) | 2006-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420023170 Expired - Fee Related CN2754758Y (en) | 2004-05-28 | 2004-05-28 | Puncturing expanding head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2754758Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101947551A (en) * | 2010-08-18 | 2011-01-19 | 衡阳华菱钢管有限公司 | Plug for large-hole series medium- and thick-wall capillaries |
| CN111282996A (en) * | 2020-04-08 | 2020-06-16 | 冯永涛 | Piercing-rolling integrated four-section type composite top |
-
2004
- 2004-05-28 CN CN 200420023170 patent/CN2754758Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101947551A (en) * | 2010-08-18 | 2011-01-19 | 衡阳华菱钢管有限公司 | Plug for large-hole series medium- and thick-wall capillaries |
| CN111282996A (en) * | 2020-04-08 | 2020-06-16 | 冯永涛 | Piercing-rolling integrated four-section type composite top |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060201 Termination date: 20130528 |