CN102825097A - Production method of alloy HMn60-3-1-0.75 large section bar - Google Patents
Production method of alloy HMn60-3-1-0.75 large section bar Download PDFInfo
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- CN102825097A CN102825097A CN2012103292498A CN201210329249A CN102825097A CN 102825097 A CN102825097 A CN 102825097A CN 2012103292498 A CN2012103292498 A CN 2012103292498A CN 201210329249 A CN201210329249 A CN 201210329249A CN 102825097 A CN102825097 A CN 102825097A
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Abstract
The invention aims to overcome the defects of a traditional processing technology of a complex alloy HMn60-3-1-0.75 bar for military industry, and provides a production method of the complex alloy HMn60-3-1-0.75 large section bar, which has excellent product performance quality, high yield, high production efficiency and low manufacturing cost. The production method comprises the following steps of: semicontinuous casting, ingot heating, hole pattern hot rolling and cogging, straightening, saw cutting, turning, flaw detection, sizing, inspecting and packaging. The production method has the following advantages of: (1) uniform mechanical properties, wherein the problem that the structure properties are not uniform in a section and a length direction of a product during production in an extrusion method; (2) high yield, wherein the yield is improved to 55-58 percent from the original 22-25 percent, the comprehensive yield is improved to more than 33 percent, and the technical-economic indicator is greatly improved; (3) high production rate, wherein the production speed of a rolling method is fast, and the rolling cycle is short, so that the production efficiency is high; and (4) low processing cost, wherein a hole pattern inlet and outlet guiding and guarding device only needs to be manufactured and processed by common materials so as to meet the technological requirements, the material consumption is low, and the cost is low.
Description
Technical field
The invention belongs to the metalworking technology field, relate in particular to a kind of military project and use complex brass
HMn60-3-1-0.75The production method of large scale rod bar.
Background technology
Complex alloys HMn60-3-1-0.75 is on С u-Zn bianry alloy basis, to add the multicomponent alloy that elements such as Mn, si, pb constitute.Have higher intensity, hardness and wearability, compare with basis brass, the ability that stress corrosion resistant breaks is strong, and has good machinability, but high-speed cutting obtains bright and clean surface.Be widely used in shipping industry and military project department and be used to produce the cylinder block material of guided missile, rocket engine.
The conventional machining process of the big specification complex alloys of domestic production HMn60-3-1-0.75 bar is at present:
Semi-continuous casting-excellent the base of ingot casting heating-horizontal extruding-aligning-sawing-turning-flaw detection-sawing scale-inspection-packing.
This traditional handicraft has the defective of the following aspects:
1), structure property is uneven.The structure property that extrudes bar is all inhomogeneous on its section and length direction, sees from the microscopic structure of the article of extruding, and the front end crystal grain of general goods always is thick, and rear end crystal grain is tiny; Then be that center crystal grain is thick on section, outer crystal grain is tiny.The article that extrude are in distortion and the structural inhomogeneous inhomogeneities that must be reflected on the product properties, generally are that the Rm of inside and front end of goods is low, A (11.3) height; The Rm outer and rear end is high, and A (11.3) is low.And for war products, then require the structure property of material to want uniformity.
2), lumber recovery is very low
Big with this bar loss due to spoiled work of extrusion production, main waste product is that " tail contracts " and pressure are surplus, wherein presses the surplus 10-15% that accounts for ingot blank weight, and all the other mainly are the defectives that " tail contracts " causes.This is because HMn60-3-1-0.75 complex alloys ingot is on С u-Zn bianry alloy basis, to have added elements such as Mn, si, pb; Zn content is 35%; The affiliation that adds of alloying element increases the zinc equivalent coefficient, particularly added 1% si element after, make the zinc equivalent coefficient in the alloy increase 10-12; And when the zinc equivalent in the alloy>46% the time, can make the mobile variation of metal when extruding.This alloy itself has alpha+beta+si-Mn phase in addition; Its flowability is least even when extruding, and these phase constitutions are common comprehensive function in extrusion process, the inhomogeneous mobile property of having aggravated to extrude metal; Make ingot blank push at the beginning outer layer metal promptly to center flow; Thereby produce very long " tail contracts " defective, account for more than 3/4 of goods length overall, the lumber recovery of the large scale rod bar of Φ 80-Φ 125mm is only had about 22-25%.
3), production efficiency is low
Because of extrusion speed is low than mill speed, and the ingot casting length limited is shorter, and the non-cutting time in an extrusion cycle is longer, and therefore, production efficiency is low than rolling.
4), tool and mould consumption is big, cost is high.
Particularly mould consumption is more outstanding when extruding high temperature, high-strength alloy.And the material of processing and manufacturing extruding tool and mould is expensive high-grade heat-resistant steel alloy, thereby makes the consumption costs of tool and mould account for more than 35% of extruded product cost, and processing cost is high.
Summary of the invention
The objective of the invention is in order to solve the deficiency of military project with the conventional machining process existence of complex alloys HMn60-3-1-0.75 bar; A kind of properties of product good quality, lumber recovery height are provided, the production method of the complex alloys HMn60-3-1-0.75 large scale rod bar of production efficiency height and low cost of manufacture.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
A kind of production method of alloy HMn60-3-1-0.75 large scale rod bar may further comprise the steps: semi-continuous casting-ingot casting heating-pass hot rolling cogging-aligning-sawing-turning-flaw detection-scale-check-packing, and concrete steps are following:
A, prepare burden by the material chemical composition requirement, then with above-mentioned batching fusing, 1010～1050 ℃ of smelting temperatures, tapping temperature: 1050 ℃, its surface covers down at borax and casts casting speed: during 4.5-5.5m/; Cooling water pressure: during beginning: 0.5 kg/cm2, just often 1.0-1.2kg/cm2; Casting hangs out round ingot casting, sawing sizing then after finishing;
B, heating:
The ingot casting that obtains among the step a is heated to 730～780 ℃, and 2.0～2.5 hours heat time heating times, furnace pressure is a pressure-fired, the hot rolling of then coming out of the stove;
C, pass hot rolling cogging:
The ingot casting that obtains among the step b is carried out hot rolling cogging in milling train;
D, aligning:
The hot-rolled rods base that on straightener, step c is obtained is aligned, and requires the lateral bending degree of aligning back length direction to be not more than 2mm/m;
E, sawing:
By the turning length requirement, be 800-1100 mm with the hot-rolled rods base length after sawing on the band sawing machine behind the steps d aligning;
F, turning:
The hot-rolled rods base that step e is obtained carries out turning at lathe and takes off cylindrical, and single face turning amount is 5-6mm, and car falls defectives such as the burr, oxide skin, slag inclusion, folder ash on hot rolling base surface, obtains finished product after the turning, and surface smoothness reaches specification requirement;
G, flaw detection:
Behind size, carry out the whole process flaw detection on circumferencial direction and the length direction with the bar of supersonic detector after to finish turning, inside is existed as slag inclusion, presss from both sides the waste product that is judged to be of defectives such as ash, pore;
H, sawing scale:
Finished product bar after the flaw detection need be by the requirement of finished product scale on band sawing machine, and sawing is different cut lengths or multiple lengths;
I, check:
Completely examine according to technical standard;
J, packing:
Through the finished product bar that is up to the standards, pack warehouse-in on request.
The present invention compared with prior art has the following advantages:
1), mechanical performance is even.
After replacing extrusion and produce the HMn60-3-1-0.75 bar with rolling (pass hot rolling), the hot rolling compression deformation makes pore in the as cast metal, shrinkage cavity, loose etc. by the seam compacting, makes dense structure.High temperature and strain energy of distortion have increased the diffusivity of atom simultaneously, alleviate and eliminated the inhomogeneities of as-cast structure composition, and resulting evenly tiny equi-axed crystal tissue behind the machining deformation, make that the mechanical performance of metal is uniform and stable, and are improved.Facts have proved,, do not exist when producing structure property in all uneven problem on the goods section and on the length direction like extrusion with the bar that rolling is produced.
2), lumber recovery is high
Produce big specification complex alloys HMn60-3-1-0.75 bar with the groove rolling method,, thereby thoroughly eliminated " tail contracts " defective that exists with extrusion because there be not " tail contracts " in groove rolling and press surplus problem.Therefore, replace extrusion with rolling lumber recovery is significantly improved, lumber recovery has been brought up to present 55-58% by original 22-25%, improves integrated yield more than 33%, has improved technical-economic index greatly.
3) productivity ratio is high
Produce big specification complex alloys HMn60-3-1-0.75 bar with the groove rolling method, can select long ingot casting to carry out hot rolling flexibly, therefore; The length of rolling bar, weight all are superior to extrusion greatly, and the rolling speed of production is fast; Rolling rhythm is short, so its production efficiency is high.
4) processing cost is low
Under equal conditions, do not need expensive high-grade heat-resistant alloy material to make the very big tool and mould of consumption with groove rolling, can satisfy technological requirement but import and export guide and guards with common material fabrication and processing pass, material consumption is low, cost is little.
Description of drawings
Fig. 1～Fig. 8 produces the signal of complex alloys HMn60-3-1-0.75 large scale rod bar Ф 500 * 1500 ㎜ milling train I frame passes for groove rolling method of the present invention; Fig. 9～Figure 16 is Ф 500 * 1500 ㎜ milling train II frame pass sketch mapes; Wherein:
Fig. 1 oval groove; Fig. 2 founds the box pass; Fig. 3 hexagonal oval groove;
Fig. 4 founds the box pass; Fig. 5 hexagonal oval groove; Fig. 6 founds the box pass;
The flat box pass of Fig. 7; Fig. 8 founds the box pass; The simple oval groove of Fig. 9;
Figure 10 circular hole; The simple oval groove of Figure 11; Figure 12 circular hole;
The simple oval groove of Figure 13; Figure 14 circular hole; The simple oval groove of Figure 15;
Figure 16 circular hole.
Sequence number is among the figure:
1～8 is respectively 1.～8. passage transition pass of Ф 500 * 1500 ㎜ milling train I framves;
9～10,11～12,13～14,15～16 are respectively the leader pass type and the last groove of the corresponding size hot-rolled bar of Ф 500 * 1500 ㎜ milling train II framves.
Symbol among the figure is:
The total height of H-corresponding pass;
The bottom land width of the corresponding pass of Ь k-;
The width of rebate of the corresponding pass of BK-;
The circular arc of the corresponding pass of R-;
The roller of the corresponding pass of S-meets.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is further specified.
The production method of alloy HMn60-3-1-0.75 large scale rod bar of the present invention may further comprise the steps:
1) prepare burden by the material chemical composition requirement: Cu:59.5-61.5%, Mn:2.0-3.25%, Si:0.5-1.5%, pb:0.5-1.0%, Fe≤0.35%, Al: Sn≤0.25% :≤0.3%, impurity summation≤0.5%, surplus is: Zn; In cored line frequency furnace, melt then, metal bath surface covers with wooden carbon, 1010～1050 ℃ of smelting temperatures; Tapping temperature: 1050 ℃, the crystallizer specification is Ф 175 mm, the casting under borax covers of its surface; Casting speed: during 4.5-5.5m/, cooling water pressure: .0.5 kg/cm2, just often 1.0-1.2kg/cm2 during beginning; After the semicontinuous casting machine top casting finishes; From melt pit, hang out round ingot casting, then the sawing scale is Ф 175 * 1350mm, both has been the used billet base of this embodiment.
2) heating:
This embodiment is a raw material with Ф 175 * 1350mm ingot casting, in three sections continuous furnaces, is heated 730～780 ℃, and 2.0～2.5 hours heat time heating times, furnace pressure is a pressure-fired, the hot rolling of then coming out of the stove;
3) pass hot rolling cogging:
Ф 175 * 1350mm ingot casting after the heating is carried out hot rolling cogging in Ф 500 * 1500mm milling train I, II frame pass, specifically be that ingot casting is introduced into Ф 500 I rolling mills and carries out 1.～4. passage groove rolling (Fig. 1～4) wherein:
The 1. road (Fig. 1), rolling in oval groove, rolling back rolled piece height h=130mm, the rolled piece width is b=175mm;
The 2. road (Fig. 2), rolling back is approximate square section rolled piece, height h=140mm, width b=140mm in upright box pass;
The 3. road (Fig. 3), rolling in the hexagonal elliptical aperture, rolling back workpiece measurement be h=120mm highly, width b=150mm;
The 4. road (Fig. 4), rolling in upright box pass, rolling back rolled piece is approximate square section, height h=120mm, width b=120mm;
Afterwards Ф 500mm II rolling mill carry out 5.～6. passage groove rolling (Figure 15～Figure 16), wherein:
The 5. road (Figure 15), rolling in simple oval groove, rolling back workpiece measurement is: height h=115mm, width b=155mm;
6. road (Figure 16), in circular hole rolling after, both be needed circle cross section hot-rolled rods base in this embodiment, its specification is: Ф 125mm;
4) aligning:
On the 150t straightener, the hot-rolled rods base is aligned, required the lateral bending degree of aligning back length direction to be not more than 2mm/m;
5) sawing:
By the turning length requirement, be 800-1100 mm with the hot-rolled rods base length after sawing on the band sawing machine behind the aligning;
6), turning:
The hot-rolled rods base is carried out turning at 300 type lathes take off cylindrical; Single face turning amount is 5-6mm, and car falls defectives such as the surperficial burr of hot rolling base, oxide skin, slag inclusion, folder ash, obtains the required finished product of this embodiment after the turning; Specification is Ф 113 mm, and surface smoothness reaches specification requirement;
7) flaw detection:
Behind size, carry out the whole process flaw detection on circumferencial direction and the length direction with the bar of supersonic detector after to finish turning, inside is existed as slag inclusion, presss from both sides the waste product that is judged to be of defectives such as ash, pore;
8), sawing scale:
Finished product bar after the flaw detection need be by the requirement of finished product scale on band sawing machine, and sawing is different cut lengths or multiple lengths;
9), check:
Completely examine according to technical standard;
10), packing:
Through the finished product bar that is up to the standards, pack warehouse-in on request.
Claims (5)
1. the production method of an alloy HMn60-3-1-0.75 large scale rod bar; It is characterized in that: may further comprise the steps: semi-continuous casting-ingot casting heating-pass hot rolling cogging-aligning-sawing-turning-flaw detection-scale-check-packing, concrete steps are following:
A, prepare burden by the material chemical composition requirement, then with above-mentioned batching fusing, 1010～1050 ℃ of smelting temperatures, tapping temperature: 1050 ℃, its surface covers down at borax and casts casting speed: during 4.5-5.5m/; Cooling water pressure: during beginning: 0.5 kg/cm2, just often 1.0-1.2kg/cm2; Casting hangs out round ingot casting, sawing sizing then after finishing;
B, heating:
The ingot casting that obtains among the step a is heated to 730～780 ℃, and 2.0～2.5 hours heat time heating times, furnace pressure is a pressure-fired, the hot rolling of then coming out of the stove;
C, pass hot rolling cogging:
The ingot casting that obtains among the step b is carried out hot rolling cogging in milling train;
D, aligning:
The hot-rolled rods base that on straightener, step c is obtained is aligned, and requires the lateral bending degree of aligning back length direction to be not more than 2mm/m;
E, sawing:
By the turning length requirement, be 800-1100 mm with the hot-rolled rods base length after sawing on the band sawing machine behind the steps d aligning;
F, turning:
The hot-rolled rods base that step e is obtained carries out turning at lathe and takes off cylindrical, and single face turning amount is 5-6mm, and car falls defectives such as the burr, oxide skin, slag inclusion, folder ash on hot rolling base surface, obtains finished product after the turning, and surface smoothness reaches specification requirement;
G, flaw detection:
Behind size, carry out the whole process flaw detection on circumferencial direction and the length direction with the bar of supersonic detector after to finish turning, inside is existed as slag inclusion, presss from both sides the waste product that is judged to be of defectives such as ash, pore;
H, sawing scale:
Finished product bar after the flaw detection need be by the requirement of finished product scale on band sawing machine, and sawing is different cut lengths or multiple lengths;
I, check:
Completely examine according to technical standard;
J, packing:
Through the finished product bar that is up to the standards, pack warehouse-in on request.
2. the production method of alloy HMn60-3-1-0.75 large scale rod bar as claimed in claim 1 is characterized in that: among the said step c, the concrete steps of hot rolling cogging are that ingot casting is introduced into the I rolling mill and carries out 1.～4. passage groove rolling, wherein:
The 1. road, rolling in oval groove, rolling back rolled piece height h=130mm, the rolled piece width is b=175mm;
The 2. road, rolling back is approximate square section rolled piece, height h=140mm, width b=140mm in upright box pass;
The 3. road, rolling in the hexagonal elliptical aperture, rolling back workpiece measurement be h=120mm highly, width b=150mm;
The 4. road, rolling in upright case pass, rolling back rolled piece is approximate square section, height h=120mm, width b=120mm;
Carry out 5.～6. passage groove rolling at the II rolling mill afterwards, wherein:
The 5. road, rolling in simple elliptical aperture, rolling back workpiece measurement does; Height h=115mm, width b=155mm;
The 6. road both had been needed circle cross section hot-rolled rods base after rolling in circular hole.
3. according to claim 1 or claim 2 the production method of alloy HMn60-3-1-0.75 large scale rod bar, it is characterized in that: among the said step a, batching melts in cored line frequency furnace, and metal bath surface covers with wooden carbon.
4. the production method of alloy HMn60-3-1-0.75 large scale rod bar as claimed in claim 3 is characterized in that: among the said step a, cast in the vertical semi-continuous casting machine and carry out.
5. the production method of alloy HMn60-3-1-0.75 large scale rod bar as claimed in claim 4 is characterized in that: among the said step b, ingot casting heats in three sections continuous furnaces.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108500080A (en) * | 2018-03-09 | 2018-09-07 | 泰州市大明不锈钢有限公司 | A kind of stainless steel bars round-bar pass technique |
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Application publication date: 20121219 |