CN102965493A - Ingot heating process for high-reducing forming of pipe mould blank - Google Patents
Ingot heating process for high-reducing forming of pipe mould blank Download PDFInfo
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- CN102965493A CN102965493A CN2012104860722A CN201210486072A CN102965493A CN 102965493 A CN102965493 A CN 102965493A CN 2012104860722 A CN2012104860722 A CN 2012104860722A CN 201210486072 A CN201210486072 A CN 201210486072A CN 102965493 A CN102965493 A CN 102965493A
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Abstract
The invention provides an ingot heating process of high-reducing forming of a pipe mould blank. The pipe mould manufacture method adopting high-reducing forming blank of an ingot comprises the following steps in sequence: smelting the ingot, re-inspecting the ingot, heating by an annular furnace, punching by hydraulic pressure, highly reducing and perforating, periodically rolling the pipe, manually and initially inspecting, straightening, roughly and mechanically processing, carrying out ultrasonic flaw detection, thermally processing, passing the physical and chemical inspection, carrying out finish machining, carrying out magnetic powder inspection, manually re-inspecting, and packaging and warehousing, wherein a bottle blank (5) is obliquely rolled and subjected to great reducing perforation by using a tapered roller (6) and an ejector header (7), so as to obtain a hollow billet 8; the ingot is heated to the temperature of 1180 DEG C for the punching and extruding under hydraulic pressure by the annular furnace; and the total time of heating the ingot is 12 to 40 hours. According to the ingot heating process, the technologies of punching by hydraulic pressure, perforating by the tapered roll in the high-reducing way, and periodically forging and rolling by a pipe rolling machine and the like are combined, and the pilger ends which are supposed to be cut during rolling are fully utilized, so that the utilization rate of the raw materials can be greatly improved, the cost of manufacturing the pipe mould is nearly lowered by 40%, the production efficiency is high, and pipe dies with all specifications can be basically prepared by using the method.
Description
Technical field
The present invention relates to the Heating Steel Ingots method in pipe die manufacturing technology field, particularly a kind of large diameter-reducing formation die blank.
Background technology
At present, utilize the centrifugal casting technology to produce ductile iron pipe and have the fast and high advantage of efficient of rhythm of production, have extremely vast potential for future development.And pipe die is the large-scale key part of centrifugal casting machine top casting iron pipe, and environment for use is extremely abominable.Pipe die is under the high speed rotating state, and molten iron applies on the pipe die inwall because of centrifugation in the cast, and the pipe die inner wall temperature is sharply raise, and outside surface by circulating water to reduce temperature.Because pipe die bears the composite conditions such as alternating thermal stress, tensile stress and torsional stress for a long time, so high to the pipe die specification of quality, pipe die is 21CrMo10 with the trade mark commonly used of pipe.
The specification limit that pipe die is commonly used is DN80 ~ DN1200, and female end external diameter maximum reaches 1569mm.According to different specifications, its complete processing is also different with method: 1) for the pipe die of specification less than DN 200, blank adopts solid forging, and the processing method of deep hole drilling, bore hole is adopted in machining; 2) for the pipe die of specification in DN 200 ~ DN 500 scopes, the blank solid forging, the processing method of employing jacking, bore hole, the core material of extracting can be used as the blank of a little specification pipe die, has realized second stage employ; 3) for the pipe die of specification greater than DN 500, adopt hollow forging, process at high-level efficiency deep hole unit type machine, realize clamped one time, located the whole body processing of finishing the positions such as pipe die endoporus, cylindrical, production efficiency is higher.
Be the pipe die of DN 200 ~ DN 500 among a small circle for specification, adopt in addition tube rolling of graceful formula point cycle of continuously cast bloom to produce the pipe die manufacturing process of blank, this technique has been brought into play the lumber recovery height that continuously cast bloom has, cost is low and the advantage of less energy consumption, has reduced the production cost of pipe die.But owing to be subjected to the restriction (maximum outside diameter is 800mm) of continuously cast bloom specification, can not produce the die blank (the large end external diameter of DN600 die blank should be not less than 860mm) of DN 600 and above specification; The pipe die female end only extends (be subjected to the restriction of Mannesmann piercer tube reducing ability, compression ratio is about 1.4) by graceful formula perforation, does not pass through the pilger mill rolling deformation, and the internal structure that continuously cast bloom is loose can not improve, even can more worsen; Loose and the shrinkage cavity of the inevitable existence in heavy caliber alloy continuous casting circular tube blank center, the front need that feed intake carry out rough bore processing to the pipe endoporus, (pipe center porosity and shrinkage cavity be not as removing to guarantee showing quality in the pipe die base, through the ring furnace heated oxide, table can form darker crackle in after the graceful formula cross piercing, and subsequent handling can't seam).
Existing pipe die manufacturing process mainly has the following disadvantages:
(1) existing pipe die adopts solid or hollow forging deep hole machining mode is made, although adopted jacking technique to improve utilization rate of raw materials in the manufacturing of Large Diameter Pipeline pipe die, material wastage rate is generally about 40%.
(2) there is not easy-formation of pipe die female end in existing pipe die manufacturing, needs the extra manufacturing of adopting the techniques such as thickening, expander to finish trumpet type pipe die female end, and this is with regard to so that there is complex process, the manufacturing cycle problem such as length partially in existing pipe die manufacturing process.
(3) adopt the continuously cast bloom pilger mill to produce die blank, Pierre's wresting of self-assembling formation, be that trumpet type pipe die female end is not through cycle forging and pressing roll forming, the same compression ratio close with forging stock (rolling ratio) that have with other parts can not be guaranteed, the raw-material performance of this part of pipe die can not be guaranteed.And female end connects with pulley belt during centrifugal casting, drives the pipe die high speed rotating, and applying working condition is the most abominable, has larger potential safety hazard; Before the heavy caliber continuous casting circular tube blank feeds intake, must carry out rough bore processing to the pipe endoporus, increase loss (about 5%) and the Boring cost of material; Be subjected to the restriction of continuously cast bloom specification, also have the narrow problem of die blank production range.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art, and provide a kind of Heating Steel Ingots method of large diameter-reducing formation die blank, with solve the complex manufacturing that exists in the prior art, the manufacturing cycle is partially long, lumber recovery is low, the product specification coverage does not extensively wait deficiency.
Technical scheme of the present invention is: a kind of Heating Steel Ingots method of large diameter-reducing formation die blank, adopt the manufacture method of the large diameter-reducing formation die blank of steel ingot to comprise ingot smelting, steel ingot reinspection, Heating Steel Ingots, hydraulic pressure punching, greatly tube reducing perforation, pilger mill, artificial initial survey, aligning, thick machining, UT (Ultrasonic Testing), thermal treatment, physical and chemical inspection, precision work, magnetic-particle inspection, manually recheck, pack warehouse-in; During Heating Steel Ingots, adopt ring furnace that Heating Steel Ingots is arrived 1150 ~ 1200 ℃ of hydraulic pressure punching extrusion temperatures, because pipe die is many with the pipe alloying element, and the steel ingot specification is huge, heat improper easy generation and add thermal defect, adopt suitable Heating temperature and rate of heating, when guaranteeing in the production that steel ingot enters stove, preheated one-section is not more than 720 ℃, 3 ~ 12 hours heat-up times; Two sections temperature of preheating are controlled at 810 ~ 830 ℃, 1.5 ~ 3 hours heat-up times; Heat one section temperature and be controlled at 900 ~ 920 ℃, 1.5 ~ 3.5 hours heat-up times; Heat two sections temperature and be controlled at 1030 ~ 1050 ℃, 1.5 ~ 3.5 hours heat-up times; Heat three sections temperature and be controlled at 1130 ~ 1150 ℃, 1.5 ~ 3.5 hours heat-up times; Heat four sections temperature and be controlled at 1250 ~ 1270 ℃, 1 ~ 6 hour heat-up time; The soaking zone temperature is controlled at 1240 ~ 1260 ℃, 2 ~ 8 hours heat-up times; Total 12 ~ 40 hours heat-up times.
The present invention is owing to adopt the steel ingot of special construction and large reducing process shaping die blank to make pipe die, can giving full play to steel ingot, to have a cost low, less energy consumption, the lumber recovery high, can be effectively in conjunction with the hydraulic pressure punching, the large tube reducing perforation of tapered roller, the technology such as pilger mill forging rolling, not only can guarantee that die blank integral body has the performance close with forging, can take full advantage of again simultaneously the Pierre's wresting that should excise when rolling, increase substantially raw-material utilization ratio, the pipe die manufacturing cost has reduced nearly 40%, production efficiency is high, technique is simple, manufacturing cycle is short, in the product safety reliability, deformation technique, there is greater advantage compression ratio (particularly female end) and pipe die specification coverage aspect, have substantially realized all standing of pipe die specification.
Below in conjunction with the drawings and specific embodiments detailed content of the present invention is further described.
Description of drawings
Fig. 1 is the structural representation of the steel ingot that uses of the present invention;
Fig. 2 is the left view of Fig. 1;
Fig. 3 is the right view of Fig. 1;
Fig. 4 is the synoptic diagram of steel ingot when being positioned at the punching of vertical water pressure puncturing machine internal mold and beginning;
Fig. 5 is the synoptic diagram of steel ingot when being positioned at the punching of vertical water pressure puncturing machine internal mold and finishing;
Fig. 6 is the bottle base synoptic diagram in the large tube reducing perforation procedure of tapered roller oblique milling of the present invention;
Fig. 7 is the hollow billet synoptic diagram after the large tube reducing punch off of tapered roller oblique milling of the present invention;
Fig. 8 is the hollow billet synoptic diagram of pilger mill forging rolling of the present invention when beginning;
Fig. 9 is the hollow forging synoptic diagram in the pilger mill forging rolling process of the present invention;
Figure 10 is the structural representation of die blank of the present invention;
Figure 11 is the structural representation of pipe die of the present invention.
Embodiment
Embodiment one:
A kind of Heating Steel Ingots method of large diameter-reducing formation die blank adopts the DN 300 type pipe die manufacture method of the large diameter-reducing formation blank of steel ingot to comprise ingot smelting, steel ingot reinspection, Heating Steel Ingots, hydraulic pressure punching, greatly tube reducing perforation, pilger mill, artificial initial survey, aligning, thick machining, UT (Ultrasonic Testing), thermal treatment, physical and chemical inspection, precision work, magnetic-particle inspection, manually recheck, pack warehouse-in;
Ingot smelting: consider the Working environment that the cast tube model is different, and ingot quality is the basis, the steel ingot material is 21CrMo10, and strictly control the content of phosphorus, sulphur, nitrogen, hydrogen, oxygen, wherein phosphorus content is less than 0.008%, sulphur content is less than 0.004%, nitrogen content is less than 100ppm, hydrogen richness is less than 2 ppm, oxygen level is less than 35 ppm, and steel ingot adopts following technique to produce: blast furnace ironmaking, Electric furnace steel making, the refining of LF stove, ladle are skimmed, the vacuum outgas of VD stove, feed silk processing, teeming, check, cut rising head, reconditioning;
Steel ingot is rechecked: surface quality, the geometrical dimension (as Figure 1-3) of rechecking steel ingot before the ring furnace heating, the circumscribed circle diameter D of the rib 2 of steel ingot body 1 periphery is 660mm, steel ingot circumscribed circle diameter D is than the large 40mm of inscribed circle diameter d of rib 2, be D=d+40 mm, the quantity of rib 2 is 18 limits, range of taper is 2.2 °, the rolling ratio of pipe die minimum compression ratio u() be the 2.7(female end);
Heating Steel Ingots: adopt ring furnace that Heating Steel Ingots is arrived 1180 ℃ of hydraulic pressure punching extrusion temperatures, because pipe die is many with the pipe alloying element, and the steel ingot specification is huge, heat improper easy generation and add thermal defect, adopt suitable Heating temperature and rate of heating, when guaranteeing in the production that steel ingot enters stove, preheated one-section is not more than 720 ℃, 3 hours heat-up times; Two sections temperature of preheating are controlled at 810 ~ 830 ℃, 1.5 hours heat-up times; Heat one section temperature and be controlled at 900 ~ 920 ℃, 1.5 hours heat-up times; Heat two sections temperature and be controlled at 1030 ~ 1050 ℃, 2 hours heat-up times; Heat three sections temperature and be controlled at 1130 ~ 1150 ℃, 2 hours heat-up times; Heat four sections temperature and be controlled at 1250 ~ 1270 ℃, 1.5 hours heat-up times; The soaking zone temperature is controlled at 1240 ~ 1260 ℃, 2 hours heat-up times; Total 14 hours heat-up times;
The hydraulic pressure punching: steel ingot is placed the internal mold 3 of hydraulic pressure puncturing machine, with drift 4 punchings (shown in Fig. 4-5), obtain external diameter 670mm, tapering and be 1.5 ° bottle base 5, the metal of bottle base 5 is crossed degree of filling 3.8% ~ 10%;
Large tube reducing perforation: bottle base 5 usefulness tapered rollers 6 and the large tube reducing perforation of top 7 oblique millings are obtained hollow billet 8(shown in Fig. 6-7), the overall diameter draft is 15.1%, ovality is 1.05, rolling angle is-3 °, reducing rate 21%, hollow billet 8 external diameters are 530 mm after the tube reducing perforation, than the large 10mm of pipe die female end external diameter (520 mm);
Pilger mill: shown in Fig. 8-10, utilize 10 pairs of hollow billets of roll 8 of pilger mill to carry out forging rolling, the Pierre's wresting that keeps self-assembling formation, guarantee that Pierre's wresting has rational process redundancy, avoid raw-material waste, design cycle tube rolling unit Φ 390mm macroporous type, comprise the forging rolling section, the finish rolling section, the curvilinear equation of finish to gauge section and shallow pass section, wherein the forging rolling section is envelope curve, forging rolling section initial angle is 25 °, and forging rolling section angle is 90 °, and forging rolling section curve length of run scope is 850mm, control roll rotational speed 48rpm, blast 5.1bar feeds the people and measures 55mm, and pilger mill keeps the 180mm pipe that becomes mildewed latter stage and do not roll, for the processing of getting horizontal sample and pipe die female end, with plug 9 and roll 10 end of hollow billet 8 is rolled into hollow forging 11, the other end self-assembling formation Pierre wresting 12, thus form die blank;
Artificial initial survey: surface quality and dimensional precision to die blank are tested;
Aligning: adopt gag straightener that die blank is aligned, guarantee that the total length sinuousness is not more than 6mm;
Thick machining: die blank is carried out surfaces externally and internally roughing cut processing and show the built-up welding step in the socket end, make it to meet the requirement of DN300 die blank pattern;
UT (Ultrasonic Testing): carry out the manual UT (Ultrasonic Testing) of L2 level by GB/T 5777 standard-requireds, guarantee the die blank inner quality;
Thermal treatment: carry out modifier treatment with regard to die blank, quenching temperature: 880 ℃, soaking time 60min, tempering temperature: 620 ℃, soaking time 140min obtain high-strong toughness tempered sorbite tissue;
Physical and chemical inspection: for fully checking the die blank performance, respectively stay 70～120 ㎜ surpluses to do the transverse mechanical performance measurement at the die blank two ends, the comprehensive mechanical property of assessment die blank meets the requirement of international standard;
Precision work: as shown in figure 11, thick mach die blank finish grinded with micro cutting be processed into pipe die, the product design document that pipe die size conforms user is provided, the surface roughness Ra of internal surface, female end 13 and socket end 14 trims of assurance pipe die is less than 1.6 um, and other surperficial roughness Ra of pipe die is less than 6.3 um;
Magnetic-particle inspection: the pipe die outside surface does not have crackle after magnetic-particle inspection;
The artificial reinspection: the pipe die internal surface does not have the defectives such as macroscopic crackle, scuffing, impression, corrosion to exist, and pipe die physical dimension meets the requirement of the DN300 product design document that the user provides;
The packing warehouse-in: pipe die is through spray printing with after weighing, and packing is put in storage.
Embodiment two:
A kind of Heating Steel Ingots method of large diameter-reducing formation die blank adopts the DN 600 type pipe die manufacture method of the large diameter-reducing formation blank of steel ingot to comprise ingot smelting, steel ingot reinspection, Heating Steel Ingots, hydraulic pressure punching, greatly tube reducing perforation, pilger mill, artificial initial survey, aligning, thick machining, UT (Ultrasonic Testing), thermal treatment, physical and chemical inspection, precision work, magnetic-particle inspection, manually recheck, pack warehouse-in;
When steel ingot was rechecked, the circumscribed circle diameter D of the rib 2 of steel ingot body 1 periphery was 970mm, and steel ingot circumscribed circle diameter D is than the large 40mm of inscribed circle diameter d of rib 2, be D=d+40 mm, the quantity of rib 2 is 18 limits, and range of taper is 1.8 °, the rolling ratio of pipe die minimum compression ratio u() be the 3.0(female end);
During Heating Steel Ingots, adopt ring furnace that Heating Steel Ingots is arrived 1180 ℃ of hydraulic pressure punching extrusion temperatures, when steel ingot entered stove, preheated one-section was not more than 720 ℃, 6 hours heat-up times; Two sections temperature of preheating are controlled at 810 ~ 830 ℃, 1.8 hours heat-up times; Heat one section temperature and be controlled at 900 ~ 920 ℃, 1.8 hours heat-up times; Heat two sections temperature and be controlled at 1030 ~ 1050 ℃, 2.2 hours heat-up times; Heat three sections temperature and be controlled at 1130 ~ 1150 ℃, 2.2 hours heat-up times; Heat four sections temperature and be controlled at 1250 ~ 1270 ℃, 2.5 hours heat-up times; The soaking zone temperature is controlled at 1240 ~ 1260 ℃, 3.5 hours heat-up times; Total 20 hours heat-up times;
During the hydraulic pressure punching, steel ingot is placed the internal mold 3 of hydraulic pressure puncturing machine, with drift 4 punchings (shown in Fig. 4-5), obtain external diameter 980mm, tapering and be 0.95 ° bottle base 5, the metal of bottle base 5 is crossed degree of filling 4.3% ~ 10.7%;
During large tube reducing perforation, bottle base 5 usefulness tapered rollers 6 and the large tube reducing perforation of top 7 oblique millings are obtained hollow billet 8(shown in Fig. 6-7), the overall diameter draft is 14.3%, ovality is 1.05, rolling angle is-2 °, reducing rate 12.3%, hollow billet 8 external diameters are 860 mm after the tube reducing perforation, than the large 10mm of pipe die female end external diameter (850 mm);
During pilger mill, shown in Fig. 8-10, utilize 10 pairs of hollow billets of roll 8 of pilger mill to carry out forging rolling, the Pierre's wresting that keeps self-assembling formation, guarantee that Pierre's wresting has rational process redundancy, avoid raw-material waste, design cycle tube rolling unit Φ 740mm macroporous type comprises the forging rolling section, the finish rolling section, the curvilinear equation of finish to gauge section and shallow pass section, wherein the forging rolling section is envelope curve, forging rolling section initial angle is 25 °, forging rolling section angle is 90 °, forging rolling section curve length of run scope is 770mm, control roll rotational speed 25rpm, blast 5.3bar, feed the people and measure 70mm, pilger mill keeps the 180mm pipe that becomes mildewed latter stage and does not roll, and is used for the processing of getting horizontal sample and pipe die female end, with plug 9 and roll 10 end of hollow billet 8 is rolled into hollow forging 11, the other end self-assembling formation Pierre wresting 12, thus die blank formed;
During thermal treatment, carry out modifier treatment with regard to die blank, quenching temperature: 880 ℃, soaking time 70min, tempering temperature: 620 ℃, soaking time 160min obtain high-strong toughness tempered sorbite tissue;
Physical and chemical inspection: for fully checking the die blank performance, respectively stay 70～120 ㎜ surpluses to do the transverse mechanical performance measurement at the die blank two ends, the comprehensive mechanical property of assessment die blank meets the requirement of international standard;
All the other methods are identical with embodiment one.
Embodiment three:
A kind of Heating Steel Ingots method of large diameter-reducing formation die blank adopts that the DN 1200 type pipe die manufacture method of the large diameter-reducing formation blank of steel ingot comprise that ingot smelting, steel ingot reinspections, ring furnace heating, hydraulic pressure punching, large tube reducing perforation, pilger mill, artificial initial survey, aligning, thick machining, UT (Ultrasonic Testing), thermal treatment, physical and chemical inspection are qualified, precision work, magnetic-particle inspection, manually rechecks, packs and put in storage;
When steel ingot was rechecked, the circumscribed circle diameter D of the rib 2 of steel ingot body 1 periphery was 1650mm, and steel ingot circumscribed circle diameter D is than the large 40mm of inscribed circle diameter d of rib 2, be D=d+40 mm, the quantity of rib 2 is 18 limits, and range of taper is 1.9 °, the rolling ratio of pipe die minimum compression ratio u() be the 3.3(female end);
During Heating Steel Ingots, adopt ring furnace that Heating Steel Ingots is arrived 1180 ℃ of hydraulic pressure punching extrusion temperatures, when steel ingot entered stove, preheated one-section was not more than 720 ℃, 12 hours heat-up times; Two sections temperature of preheating are controlled at 810 ~ 830 ℃, 3 hours heat-up times; Heat one section temperature and be controlled at 900 ~ 920 ℃, 3 hours heat-up times; Heat two sections temperature and be controlled at 1030 ~ 1050 ℃, 3 hours heat-up times; Heat three sections temperature and be controlled at 1130 ~ 1150 ℃, 3 hours heat-up times; Heat four sections temperature and be controlled at 1250 ~ 1270 ℃, 5 hours heat-up times; The soaking zone temperature is controlled at 1240 ~ 1260 ℃, 7 hours heat-up times; Total 36 hours heat-up times;
During the hydraulic pressure punching, steel ingot is placed the internal mold 3 of hydraulic pressure puncturing machine, with drift 4 punchings (shown in Fig. 4-5), obtain external diameter 1670mm, tapering and be 1.25 ° bottle base 5, the metal of bottle base 5 is crossed degree of filling 5.6% ~ 8.5%;
During large tube reducing perforation, bottle base 5 usefulness tapered rollers 6 and the large tube reducing perforation of top 7 oblique millings are obtained hollow billet 8(shown in Fig. 6-7), the overall diameter draft is 10.8%, ovality is 1.06, rolling angle is-3 °, reducing rate 5.4%, hollow billet 8 external diameters are 1579 mm after the tube reducing perforation, than the large 10mm of pipe die female end external diameter (1569 mm);
During pilger mill, shown in Fig. 8-10, utilize 10 pairs of hollow billets of roll 8 of pilger mill to carry out forging rolling, the Pierre's wresting that keeps self-assembling formation, guarantee that Pierre's wresting has rational process redundancy, avoid raw-material waste, design cycle tube rolling unit Φ 1390mm macroporous type comprises the forging rolling section, the finish rolling section, the curvilinear equation of finish to gauge section and shallow pass section, wherein the forging rolling section is envelope curve, forging rolling section initial angle is 25 °, forging rolling section angle is 90 °, forging rolling section curve length of run scope is 370mm, control roll rotational speed 8rpm, blast 5.5bar, feed the people and measure 80mm, pilger mill keeps the 180mm pipe that becomes mildewed latter stage and does not roll, and is used for the processing of getting horizontal sample and pipe die female end, with plug 9 and roll 10 end of hollow billet 8 is rolled into hollow forging 11, the other end self-assembling formation Pierre wresting 12, thus die blank formed;
During thermal treatment, carry out modifier treatment with regard to die blank, quenching temperature: 880 ℃, soaking time 130min, tempering temperature: 620 ℃, soaking time 300min obtain high-strong toughness tempered sorbite tissue;
Physical and chemical inspection: for fully checking the die blank performance, respectively stay 70～120 ㎜ surpluses to do the transverse mechanical performance measurement at the die blank two ends, the comprehensive mechanical property of assessment die blank meets the requirement of international standard;
All the other methods are identical with embodiment one.
Claims (4)
1. the Heating Steel Ingots method of a large diameter-reducing formation die blank adopts that the pipe die manufacture method of the large diameter-reducing formation blank of steel ingot comprises that ingot smelting, steel ingot reinspections, ring furnace heating, hydraulic pressure punching, large tube reducing perforation, pilger mill, artificial initial survey, aligning, thick machining, UT (Ultrasonic Testing), thermal treatment, physical and chemical inspection are qualified, precision work, magnetic-particle inspection, manually rechecks, packs and put in storage; It is characterized in that: during Heating Steel Ingots, adopt ring furnace that Heating Steel Ingots is arrived 1150 ~ 1200 ℃ of hydraulic pressure punching extrusion temperatures, when steel ingot entered stove, preheated one-section was not more than 720 ℃, 3 ~ 12 hours heat-up times; Two sections temperature of preheating are controlled at 810 ~ 830 ℃, 1.5 ~ 3 hours heat-up times; Heat one section temperature and be controlled at 900 ~ 920 ℃, 1.5 ~ 3.5 hours heat-up times; Heat two sections temperature and be controlled at 1030 ~ 1050 ℃, 1.5 ~ 3.5 hours heat-up times; Heat three sections temperature and be controlled at 1130 ~ 1150 ℃, 1.5 ~ 3.5 hours heat-up times; Heat four sections temperature and be controlled at 1250 ~ 1270 ℃, 1 ~ 6 hour heat-up time; The soaking zone temperature is controlled at 1240 ~ 1260 ℃, 2 ~ 8 hours heat-up times; Total 12 ~ 40 hours heat-up times.
2. the Heating Steel Ingots method of a kind of large diameter-reducing formation die blank according to claim 1, it is characterized in that: during Heating Steel Ingots, adopt ring furnace that Heating Steel Ingots is arrived 1180 ℃ of hydraulic pressure punching extrusion temperatures, when steel ingot enters stove, preheated one-section is not more than 720 ℃, 3 hours heat-up times; Two sections temperature of preheating are controlled at 810 ~ 830 ℃, 1.5 hours heat-up times; Heat one section temperature and be controlled at 900 ~ 920 ℃, 1.5 hours heat-up times; Heat two sections temperature and be controlled at 1030 ~ 1050 ℃, 2 hours heat-up times; Heat three sections temperature and be controlled at 1130 ~ 1150 ℃, 2 hours heat-up times; Heat four sections temperature and be controlled at 1250 ~ 1270 ℃, 1.5 hours heat-up times; The soaking zone temperature is controlled at 1240 ~ 1260 ℃, 2 hours heat-up times; Total 14 hours heat-up times.
3. the Heating Steel Ingots method of a kind of large diameter-reducing formation die blank according to claim 1, it is characterized in that: during Heating Steel Ingots, adopt ring furnace that Heating Steel Ingots is arrived 1180 ℃ of hydraulic pressure punching extrusion temperatures, when steel ingot enters stove, preheated one-section is not more than 720 ℃, 6 hours heat-up times; Two sections temperature of preheating are controlled at 810 ~ 830 ℃, 1.8 hours heat-up times; Heat one section temperature and be controlled at 900 ~ 920 ℃, 1.8 hours heat-up times; Heat two sections temperature and be controlled at 1030 ~ 1050 ℃, 2.2 hours heat-up times; Heat three sections temperature and be controlled at 1130 ~ 1150 ℃, 2.2 hours heat-up times; Heat four sections temperature and be controlled at 1250 ~ 1270 ℃, 2.5 hours heat-up times; The soaking zone temperature is controlled at 1240 ~ 1260 ℃, 3.5 hours heat-up times; Total 20 hours heat-up times.
4. the Heating Steel Ingots method of a kind of large diameter-reducing formation die blank according to claim 1, it is characterized in that: during Heating Steel Ingots, adopt ring furnace that Heating Steel Ingots is arrived 1180 ℃ of hydraulic pressure punching extrusion temperatures, when steel ingot enters stove, preheated one-section is not more than 720 ℃, 12 hours heat-up times; Two sections temperature of preheating are controlled at 810 ~ 830 ℃, 3 hours heat-up times; Heat one section temperature and be controlled at 900 ~ 920 ℃, 3 hours heat-up times; Heat two sections temperature and be controlled at 1030 ~ 1050 ℃, 3 hours heat-up times; Heat three sections temperature and be controlled at 1130 ~ 1150 ℃, 3 hours heat-up times; Heat four sections temperature and be controlled at 1250 ~ 1270 ℃, 5 hours heat-up times; The soaking zone temperature is controlled at 1240 ~ 1260 ℃, 7 hours heat-up times; Total 36 hours heat-up times.
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