CN102430675B - Method for producing steel for non-cold machining connection - Google Patents
Method for producing steel for non-cold machining connection Download PDFInfo
- Publication number
- CN102430675B CN102430675B CN201110312904.4A CN201110312904A CN102430675B CN 102430675 B CN102430675 B CN 102430675B CN 201110312904 A CN201110312904 A CN 201110312904A CN 102430675 B CN102430675 B CN 102430675B
- Authority
- CN
- China
- Prior art keywords
- gear
- steel
- roll
- finisher
- rolling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention discloses a method for producing steel for non-cold machining connection. With adoption of the invention, high precision fine thread steel can be rolled by hot rolling process. The production method provided by the invention is molding at once without secondary operation, has high production efficiency and low production cost and is beneficial to large scale application.
Description
Technical field
The present invention relates to ground anchorage and architectural engineering technology, be specifically related to a kind of production method of non-cold machining steel for connection.
Background technology
In social base is built, as the construction projects such as highway, railway, bridge, tunnel, mine, dam body all be unable to do without steel, wherein all kinds of bar steel are indispensable in these capital constructions.Take mine construction as example, mine laneway is arranged in certain geological environment, subterranean body forms various structural planes in the geological movement of very long complexity, be easy to cracking, especially in the middle and later periods of engineering excavation, because near load change working face causes stress field redistribution, the structural plane in rock mass or weak part are moved by stress, the Macroscopic that is developed into rock mass by less creep, causes engineering accident.In order to prevent the generation of this type of accident, in engineering, often utilize all kinds of bar steel to impose anchoring to mine laneway country rock, be about to bar steel one end and squeeze into rock mass inside fixed with rock mass, end exposes and fixes with clamp structure, by the axial force of bar steel, by unidirectional (or two-way) pressurized, change the stress state of certain limit rock mass in country rock into three dimension stress, thereby improve its hoop compression strength, to rock mass, provide support and effect of contraction initiatively, prevent that rock mass from caving in.
Conventional bar steel is mainly all kinds of screw-thread steels, but screw-thread steel is difficult to directly coordinate with clamp structure, therefore need to form tailing screw flight to the cold working of body of rod end secondary, can coordinate with clamp structure realize fastening.The normal processing method adopting has two kinds, and a kind of is that lathe turning method, another kind are to prolong nip drum silk method.Turning method can cause turning position sectional area to reduce, and bearing capacity reduces, and screw-thread steel overall performance declines; Prolong platen press and also can cause tailing screw flight sectional area to reduce, depression of bearing force, also easily causes steel product stress to concentrate, and extends rate variance, and when dynamic loading is larger, brittle failure often occurs afterbody.No matter adopt which kind of cold working means, capital makes the overall performance of screw-thread steel at tailing screw flight place, form bottleneck, and the length of its tailing screw flight section is limited (being generally 100mm), when country rock generation wall caving causes afterbody protruded length long, even clamp nut is screwed to the end of to, also cannot contact with scar, cause anchoring to be lost efficacy.In addition,, when many reinforcing bars of needs connect use, because the head and the tail pitch of screw-thread steel is different, be difficult to be threaded connection realize connecting and use.
Summary of the invention
Given this, the invention provides a kind of production method of non-cold machining steel for connection, can rolling high precision minor thread connection steel, without secondary operations.The production method of non-cold machining steel for connection of the present invention comprise breaking down, in roll and finish rolling, finish rolling comprises: step 1, milling train is the special-shaped rolled piece that cross section mid portion is more flat, two ends are outstanding by rolled piece rolling before finished product; Step 2, described special-shaped rolled piece enters finisher after ways reverses 90 °; And step 3, finisher is non-cold machining steel for connection by special-shaped rolled piece rolling; Wherein, before finished product, the size of pass of milling train and the size of the pass of finisher are corresponding; Regulate tooth device so that the cross rib groove of roll forms helix on same helicoid; Utilize lash compensation device in finisher that cross rib groove is remained on same helicoid and form helix; Wherein, the control method of adjusting tooth device is the adjustment pin regulating on left dish, so that right dish is with respect to left disc spins, until the cross rib groove of roll forms helix on same helicoid; And, before operation, check lash compensation device, the field of conjugate action of the gear in lash compensation device is strictly meshed.
Beneficial effect:
Before the finished product of production method of the present invention, the workpiece measurement of institute's rolling of milling train and finisher is corresponding, by adjusting, adjusts tooth device and lash compensation device to realize that long working is indeformable, side set not, and rolling accuracy is high, and production cost is low.
Accompanying drawing explanation
Fig. 1 is the stereogram of non-cold machining steel for connection.
Fig. 2 is the helicitic texture schematic diagram of non-cold machining steel for connection.
Fig. 3 is the schematic cross-sectional view of non-cold machining steel for connection.
Fig. 4 is the vertical section schematic diagram of non-cold machining steel for connection.
Fig. 5 is the structural representation of finisher.
Fig. 6 is the structural representation of the roll of finisher.
Fig. 7 is for adjusting the structural representation of the left dish of tooth device.
Fig. 8 is for adjusting the structural representation of the right dish of tooth device.
Fig. 9 is the lash compensation device structural representation in distributor box.
Figure 10 is the lash compensation device structural representation on universal drive shaft.
Figure 11 is the cross sectional representation of the flat formula steel that before finished product, mill milling goes out.
Wherein, the D1-core diameter of thread (nominal diameter), the D2-pitch diameter of thread, L-pitch, the tooth of H-screw thread is high, β-tooth form angle, 1-direct current generator, 2-shaft coupling, 3-reductor, 4-shaft coupling, 5-distributor box, 6-lash compensation device, 7-universal drive shaft, 8-roll, 9-adjusts tooth device.
Specific embodiment
Below in conjunction with the accompanying drawing embodiment that develops simultaneously, describe the present invention.
As shown in Figure 1, the cross rib on the non-cold machining steel for connection poker body of rod of rolling of the present invention forms helix on same helicoid, and any position of the body of rod all can be revolved with matching nut, without secondary cold working.
As shown in Figure 2 the helicitic texture of non-cold machining steel for connection, wherein L is pitch, L=4 ± 2mm; Preferably, pitch L is 3mm, 4mm, 5mm, 6mm.
As Fig. 3 shows the cross section of non-cold machining steel for connection, the tooth that wherein H is screw thread is high, 1.0mm≤H≤1.7mm; Preferably, the high H of tooth is 1.0mm, 1.2mm, 1.4mm, 1.5mm.
As Fig. 4 shows the vertical section of non-cold machining steel for connection, the tooth form of screw thread is trapezoidal, and β is tooth form angle, is the angle of trapezoidal two sides extended line; Preferably, tooth form angle β is 60 °.
The present invention, except having considered the pitch L and Ya Gao H of screw thread, has also considered lead angle γ.Lead angle γ refers on central diameter cylinder or central diameter circular cone, the tangent line of helix and interplanar angle perpendicular to the axis of thread, and computing formula is: γ=arc tan (L/ π D
2), D wherein
2for the pitch diameter of thread.When getting pitch L=4mm, during the high H=1.4mm of tooth, the numerical value of body of rod nominal diameter D1 and lead angle γ is:
| Nominal diameter D1(mm) | 16 | 18 | 20 | 22 |
| Lead angle γ (°) | 4.18 | 3.76 | 3.41 | 3.12 |
With nominal diameter D1=20mm, pitch L=4mm, the high H=1.4mm of tooth, lead angle γ=3.41 °, the product of β=60, tooth form angle ° is example, the heavy 2.64kg/m of actual measurement product rice.If adopt regular screw threads steel afterbody cutted thread technique to realize same texts, after turning, at the bottom of tailing screw flight, footpath D1 is not less than 20mm, the fine thread that the screw thread of looking into the known correspondence of related data is M22 * 1.5, be the minimum 22mm of being of footpath, end D1 of turning screw-thread steel used, under the desirable prerequisite of disregarding in screw-thread steel ovality and cross rib weight, screw-thread steel rice is heavily 2.98kg/m.More known, the non-cold machining steel for connection of every use 1m, can saving steel 0.34kg, and more existing screw-thread steel can saving steel 11.4%, and as considered actual conditions, this ratio also will expand.
During use, country rock inside is squeezed into in one end of described non-cold machining steel for connection, be integrated with country rock is fixed, according to wall rock condition, at body of rod exposed parts, install secure component (as anchor dish and nut etc.) additional fastening.The reliable screw thread self-locking performance of this product has avoided clamp nut to come off, and has improved security.Because the cross rib on the body of rod forms helix on same helicoid, when country rock generation wall caving comes off, when anchoring was lost efficacy, secure component can follow up continuously, again fastening, without secondary anchoring, has greatly saved steel, has reduced engineering cost.
Rolling equipment:
The production equipment of non-cold machining steel for connection of the present invention comprises finisher K1 and the front milling train K2 of finished product, before finished product, the roll of milling train K2 has section groove, its rolled piece rolling out is flat formula steel, the roll pass of finisher K1 is on the same helicoid of cross rib groove, to form the pass of helix, on finisher K1, be equipped with and adjust tooth device and lash compensation device, cross rib on the body of rod of assurance finished product screw-thread steel forms helix on same helicoid, and pitch is 4 ± 2mm, lead angle is not more than 6 °, the tooth of screw thread high between 1.0mm between 1.7mm.
Fig. 5 shows the structure of finisher K1, and it comprises direct current generator, reductor, distributor box, universal drive shaft, tune tooth device, lash compensation device and two rolls.Wherein, direct current generator, reductor and distributor box are connected by shaft coupling, and distributor box is connected with roll by universal drive shaft, be equipped with one and adjust tooth device on universal drive shaft, in distributor box He on universal drive shaft, a lash compensation device are respectively housed.
Fig. 6 shows the roll of finisher K1, and its groove is screw thread groove, at the surface uniform of groove recess, is furnished with horizontal negative thread.For making the roll pass of finisher K1, be continuous screw thread pass, thereby make the cross rib on the screw-thread steel body of rod form helix on same helicoid, in finisher K1, be provided with and adjust tooth device and lash compensation device, the two is for controlling the relative position of roll.
About adjusting tooth device, it is for adjusting the position of one of them roll, to control the relative position of two rolls.Adjust tooth device to comprise left and right two dishes, as shown in Figure 7 and Figure 8, two dishes have corresponding projection, and what projection was not enough semicircle is arc, between projection, there is gap, two dishes form revolute pair by jackshaft, and the projection of left dish has adjustment pin, is positioned at the through hole setting in advance, the right half part correspondence position of right dish has groove, adjust the groove that pin is resisted against right dish, left dish is fixedly connected with the gear output shaft in distributor box, and right dish is fixedly connected with the universal drive shaft of topping roll.
The effect of adjusting tooth device is to realize the fine setting to universal drive shaft by adjusting the relative position of left and right two dishes, and then realize the fine setting of breaker roll, concrete grammar is: regulate the adjustment pin on left dish, right dish is with respect to left disc spins, via universal drive shaft, drive connected topping roll to produce rotation, the horizontal negative thread of topping roll screw thread groove microdisplacement correspondingly, now bottom roll is static, so the horizontal negative thread relative position of upper and lower roll is adjusted, repeatedly adjust until form continuous screw thread pass.Preferably, the adjusting range of adjustment pin is 0-L.
About lash compensation device, its effect is to eliminate in advance gear backlash, because gear is engaged with sideshake, if do not consider the impact of gear backlash while adjusting roll pass, two rolls will misplace, and cause screw thread discontinuous.Fig. 9 shows the structure that is arranged on the lash compensation device in distributor box, it is comprised of three gears, gear 12 is fixedly connected with the power shaft of distributor box, this power shaft connects universal drive shaft as output shaft simultaneously, gear 11 is fixedly connected with another output shaft of distributor box, this another output shaft is fixedly connected with another root universal drive shaft, and gear 10 is hinged with power shaft, can power shaft be that rotate in axle center.Gear 11 all meshes with gear 12 and 10.Between gear 10 and 12, be provided with butterfly spring, butterfly spring provides power to gear 10, gear 10 is rotated relative to 12, thereby made before power shaft does not rotate, gear 10 and 11 the field of conjugate action state in strict engagement, gear 11 and 12 the field of conjugate action be the state in strict engagement also, reaches the effect of eliminating in advance gear clearance.Take Fig. 9 as example, gear 10 and 11 the field of conjugate action and the field of conjugate action of gear 11 and 12 are two flank of tooth of the same groove of gear 11, the median plane of supposing this groove overlaps with paper, if the direction of driving torque is perpendicular to paper inwards, gear 12 and 11 the field of conjugate action are the flank of tooth of paper below, and the field of conjugate action of gear 11 and 10 is flank of tooth of paper top.The operating principle of this lash compensation device is: by butterfly spring, provide pretightning force that the second gear and the first gear and the 3rd gear are meshed, without sideshake, after rotation torque input, gear 12 driven wheels 11 rotate, and moment of torsion is passed to two rolls by universal drive shaft.Lash compensation device can make the engaging piece strict engagement in advance of gear, guarantees long-term operation gearless sideshake, thereby keeps the relative position of two rolls constant all the time, and the screw thread rolling out is indeformable, not side set.
In addition,, for eliminating the splined shaft of universal drive shaft and the gap between spline housing, on universal drive shaft, be also provided with lash compensation device.Lash compensation device on universal drive shaft is identical with the operating principle of lash compensation device in distributor box, but structure is different.
The present invention is provided with ring flange in the end of the spline housing of universal drive shaft, lash compensation device on universal drive shaft is circular ring, interior ring is spline, keyway modulus is identical with spline housing with the number of teeth, outer shroud is the flange arrangement (as shown in figure 10) corresponding with spline housing end flange dish, this compensator is enclosed within on splined shaft and with spline housing ring flange and is connected by inclined hole bolt, utilize inclined hole bolt to provide moment of torsion to spline housing, make the strictly engagement all the time of spline housing and splined shaft, reach the object of eliminating drive gap.
For milling train K2 before finished product, be different from conventional oval roll pass, before finished product, the roll of milling train K2 has section groove, and the rolled piece rolling out is flat formula steel, and cross section is the shape that mid portion is more flat, two ends are outstanding (as shown in figure 11).For guaranteeing rolling accuracy, flat formula steel before the finished product of the corresponding different size of finished product screw-thread steel of different size.
Because flat formula steel before finished product must be sent into finisher K1 and just can reach rolling requirement after leading position, therefore ways is set.Ways refers in rolling of sectional iron process, be arranged on help before and after roll pass rolled piece by set direction and state accurate stable enter and derive the device of roll pass.The arrival end of ways is the circular hole that diameter is larger, and the port of export is slotted hole and the corresponding certain angle that reversed, and mid portion seamlessly transits.In specific embodiment, before finished product, the exit of milling train K2 is provided with ways one, in the porch of finisher K1, is provided with ways two.During operation, rolled piece becomes flat formula steel after milling train K2 rolling before finished product, and level enters ways one, after 45 ° of axial torsion, enters ways two, again after 45 ° of axial torsion, vertically enters in finisher K1.Thus, utilize ways one and ways two, the flat formula steel that milling train K2 before finished product is rolled out is sent into finisher K1 after 90 ° of axial torsion.
Before finished product, the design of the section groove of milling train K2 roll has considered that rolled piece enters horizontal and vertical the flowing after finisher K1.Particularly, the finished product screw-thread steel that the nominal diameter of take is 20mm is example, and before its finished product, flat formula steel is of a size of 31 * 13mm, sends into the interior longitudinally pressurized of screw thread groove of finisher K1, and steel material, to lateral extension, generates screw thread simultaneously; Special size due to flat formula steel, make the degree of lateral extension of rolled piece controlled, guarantee not produce vertical rib, and, what is more important, the rolling of this finisher K1 institute be that pitch is less than 6mm, tooth is tall and big in 1.0mm, the fine thread that lead angle is less than 6 °, if can not strictly meet the size corresponding relation of rolled piece and groove, also just can not control the horizontal and vertical mobile degree of steel material, by the substandard products that occur that screw thread rolling is incomplete, even cannot roll out the screw thread of shape.
In addition, in order to reduce roll displacement in vertical direction, on the roll pull bar of finisher K1, clamp nut is housed, be fastened on respectively in the bearing block of upper and lower roll, totally 8, can increase the pretightning force of roll, improve the rigidity of milling train, eliminate to a certain extent roll spring, keep the stability of milling train long working, improve the rolling accuracy of long working.Preferably, the 500mm of the more conventional roll of roll integral width of finisher K1 has shortened about 100mm, can reduce the amount of deflection of roll, improves the rolling accuracy of long working.
Work flow:
With rolling nominal diameter D1=20mm, pitch L=4mm, the non-cold machining steel for connection of the high H=1.4mm of tooth is example, and use billet bloom size is 150 * 150 * 2000mm, and breaking down temperature is between 1200-1250 ℃, through 7 road blooming mill continuous rollings, obtain the rolled piece that cross section is quadrangle (60 * 60mm), then in 4 roads mill milling, in roll temperature between 1000-1150 ℃, obtain cross section for the rolled piece of circular (35 * 35mm), enter the finish rolling stage; Totally 4 of finishing mills, after premenstrual twice finish rolling, rolled piece is admitted to the front milling train K2 of finished product, flat formula steel (13 * 31mm) before its section groove rolling obtains finished product, through ways, lead position, before finished product, flat formula steel enters finisher K1, and finishing temperature is more than 850 ℃, finisher K1 is nominal diameter D1=20mm by its rolling, pitch L=4mm, the non-cold machining steel for connection of the high H=1.4mm of tooth, subsequently cooling, packaging and warehousing.In operation process, by regulating the tune tooth device of finisher K1 to change the relative position of upper and lower roll screw thread groove, make roll form cross rib groove and on same helicoid, form the pass of helix.By the lash compensation device in distributor box and on universal drive shaft, eliminate gear clearance, maintain roll pass, guarantee rolling accuracy.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (2)
1. a production method for non-cold machining steel for connection, comprise breaking down, in roll and finish rolling, it is characterized in that, described finish rolling comprises:
Step 1, before finished product, milling train is the special-shaped rolled piece that cross section mid portion is more flat, two ends are outstanding by rolled piece rolling;
Step 2, described special-shaped rolled piece enters finisher after ways reverses 90 °;
Step 3, finisher is non-cold machining steel for connection by special-shaped rolled piece rolling; Wherein, step 1 to the rolling temperature of step 3 is more than 850 ℃,
The size of described special-shaped rolled piece is corresponding with the size of described non-cold machining steel for connection; Regulate tooth device so that the cross rib groove of roll forms helix on same helicoid; Utilize lash compensation device in finisher that cross rib groove is remained on same helicoid and form helix;
Described lash compensation device is comprised of three gears, is respectively the first gear, the second gear and the 3rd gear, and described the second gear and the first gear and the 3rd gear all mesh; The field of conjugate action of the field of conjugate action of the 3rd gear and the second gear and the second gear and the first gear is two flank of tooth of the same groove of the second gear;
Between described the 3rd gear and the first gear, be provided with butterfly spring, pretightening force of butterfly spring makes the second gear and the first gear and the engagement of the 3rd gear; After rotation torque input, first gear drive the second gear rotates;
The control method of adjusting tooth device is the adjustment pin regulating on left dish, so that right dish is with respect to left disc spins, until the cross rib groove of roll forms helix on same helicoid; And before operation, check lash compensation device, the field of conjugate action of the gear in lash compensation device is strictly meshed.
2. production method as claimed in claim 1, is characterized in that, the adjusting range of adjusting pin is less than the flight pitch of cross rib groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110312904.4A CN102430675B (en) | 2011-10-14 | 2011-10-14 | Method for producing steel for non-cold machining connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110312904.4A CN102430675B (en) | 2011-10-14 | 2011-10-14 | Method for producing steel for non-cold machining connection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102430675A CN102430675A (en) | 2012-05-02 |
| CN102430675B true CN102430675B (en) | 2014-04-09 |
Family
ID=45979227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110312904.4A Active CN102430675B (en) | 2011-10-14 | 2011-10-14 | Method for producing steel for non-cold machining connection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102430675B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3022085A1 (en) * | 1979-06-15 | 1981-02-05 | Rudolf Gruber | CONCRETE REINFORCING BAR, ESPECIALLY ANCHOR BAR, AND METHOD FOR THE PRODUCTION THEREOF |
| EP0306887A1 (en) * | 1987-09-11 | 1989-03-15 | Dyckerhoff & Widmann Aktiengesellschaft | Hot rolled concrete reinforcing rod, particularly a concrete ribbed bar |
| CN1124684A (en) * | 1993-12-15 | 1996-06-19 | 北京航空航天大学 | High-efficient multifunctional vibration threading machine |
| CN2729432Y (en) * | 2004-09-12 | 2005-09-28 | 郑州华萦化纤科技有限责任公司 | Gear with function for removing sideshake of subgear |
| CN2755358Y (en) * | 2004-10-29 | 2006-02-01 | 哈尔滨量具刃具集团有限责任公司 | Transmission backlash eliminating device of helical gears |
| CN201074694Y (en) * | 2007-07-03 | 2008-06-18 | 天津开利达控制技术开发有限公司 | Device for continuously regulating and positioning electric activator |
| CN201579266U (en) * | 2009-12-28 | 2010-09-15 | 莱芜钢铁股份有限公司 | Phase regulator with function of linearity regulation |
-
2011
- 2011-10-14 CN CN201110312904.4A patent/CN102430675B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3022085A1 (en) * | 1979-06-15 | 1981-02-05 | Rudolf Gruber | CONCRETE REINFORCING BAR, ESPECIALLY ANCHOR BAR, AND METHOD FOR THE PRODUCTION THEREOF |
| EP0306887A1 (en) * | 1987-09-11 | 1989-03-15 | Dyckerhoff & Widmann Aktiengesellschaft | Hot rolled concrete reinforcing rod, particularly a concrete ribbed bar |
| CN1124684A (en) * | 1993-12-15 | 1996-06-19 | 北京航空航天大学 | High-efficient multifunctional vibration threading machine |
| CN2729432Y (en) * | 2004-09-12 | 2005-09-28 | 郑州华萦化纤科技有限责任公司 | Gear with function for removing sideshake of subgear |
| CN2755358Y (en) * | 2004-10-29 | 2006-02-01 | 哈尔滨量具刃具集团有限责任公司 | Transmission backlash eliminating device of helical gears |
| CN201074694Y (en) * | 2007-07-03 | 2008-06-18 | 天津开利达控制技术开发有限公司 | Device for continuously regulating and positioning electric activator |
| CN201579266U (en) * | 2009-12-28 | 2010-09-15 | 莱芜钢铁股份有限公司 | Phase regulator with function of linearity regulation |
Non-Patent Citations (8)
| Title |
|---|
| PSB830高强度精轧螺纹钢筋的试制;徐龙等;《山西冶金》;20110630;第34卷(第3期);第58-60页 * |
| 丁福绥等.精轧螺纹钢筋的研制.《轧钢》.1984,(第1期),第20-24页. |
| 伍利群.齿轮传动间隙的消除方法.《机床与液压》.2005,(第5期),第187-188页. |
| 吴明安等.热轧矿用锚杆螺纹钢的研制.《山西冶金》.2002,(第2期),第65-67页. |
| 徐龙等.PSB830高强度精轧螺纹钢筋的试制.《山西冶金》.2011,第34卷(第3期),第58-60页. |
| 热轧矿用锚杆螺纹钢的研制;吴明安等;《山西冶金》;20020630(第2期);第65-67页 * |
| 精轧螺纹钢筋的研制;丁福绥等;《轧钢》;19841231(第1期);第20-24页 * |
| 齿轮传动间隙的消除方法;伍利群;《机床与液压》;20050530(第5期);第187-188页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102430675A (en) | 2012-05-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3861187A (en) | Rolling stand for rolling substantially rod-like stock | |
| CN102352884B (en) | Steel used for non-cold-working connection | |
| US4953379A (en) | Hot-rolled steel bar with helically extending ribs, method of and apparatus for producing the steel bar | |
| CN103909093B (en) | A kind of pony roll footpath six-high cluster mill and control method for rolling | |
| CN204523055U (en) | Compound pendulum jaw breaker discharge gate clearance adjustment mechanism | |
| CN202273230U (en) | Non-cold machining steel for connection | |
| CN102764769B (en) | Roller radial adjusting mechanism of cross beam type four-roller profile rolling mill | |
| CN102363152B (en) | Production equipment of steel for non-cold processing joint | |
| CN102240950A (en) | Cambered surface cam grinding center based on reducing grinding wheel grinding | |
| CN102430675B (en) | Method for producing steel for non-cold machining connection | |
| CA2802913C (en) | A tensionable threaded rebar bolt | |
| CN202700957U (en) | Roll radial adjusting mechanism of crossed beam type four-roll section bar rolling mill | |
| CN106424132A (en) | Prestress universal rolling mill for H structural steel production | |
| CN101758082B (en) | Phase regulator with linear regulating function | |
| CN101428299A (en) | Short stress path molding mill | |
| CN104607462B (en) | Design of large round hole pattern and guide device for blooming mill with single machine frame | |
| CN1994638A (en) | A combined multifunctional boring cutter | |
| CN203955715U (en) | A kind of axial regulating mechanism of short stress path rolling mill | |
| CN203655927U (en) | Universal joint mechanism | |
| CN201446126U (en) | Four-roller obliquely rolling machine of multiple standards of externally threaded anchor rods | |
| CN202174470U (en) | Cambered surface cam grinding center based on grinding of variable-diameter grinding wheel | |
| CN203541096U (en) | Height adjusting device of forming roller | |
| CN105618790A (en) | Maintenance lathe for electric pole molds | |
| CN204755635U (en) | Phase place adjustable universal joint for rolling mill | |
| CN202570759U (en) | Rolling mill drum-type gear coupling for preventing moment shear force from overloading |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |