CN101049615A - Hot extrusion collection molding technique for pipe end of high-pressure straight pipe in fracturing complete sets of equipment in oil-gas field - Google Patents
Hot extrusion collection molding technique for pipe end of high-pressure straight pipe in fracturing complete sets of equipment in oil-gas field Download PDFInfo
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- CN101049615A CN101049615A CN 200610018715 CN200610018715A CN101049615A CN 101049615 A CN101049615 A CN 101049615A CN 200610018715 CN200610018715 CN 200610018715 CN 200610018715 A CN200610018715 A CN 200610018715A CN 101049615 A CN101049615 A CN 101049615A
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Abstract
A hot pressing technology for forming the end part of a high-pressure straight tube used in the complete-set apparatus for the fracturing of oil-gas field includes such steps as blanking a steel tube, heating its end part according a temp gradient curve, removing oxidized scales, hot die pressing, and examining.
Description
(1) technical field: the present invention relates to spare and accessory parts technology improvement in the engineering mechanical device.
(2) background technology: the high pressure straight tube in the oil-gas field fracturing complete set of equipments, its operating pressure is between 40MPa～100MPa, and must bear the test pressure of 60～150MPa.Especially in the pressure limit of 105MPa, never allow to adopt welding method to make this series products.Because the International standardization of this product, and because of assembling needs, this product two ends has bigger external diameter and wall thickness.The present domestic two ends car system taper pipe thread that is used in seamless steel pipe that always prolongs adopts union (oil field compression fracture complete set of equipments special joint, the loose joint structure in the similar water heating fittings) to seal again and connection forms, and is combining structure.And adopt this constructed products often very easily to occur leaking because of the thread connection part in actual applications because of the hammering wing nut, make troubles and danger to construction operation, and the manufacturing cost height, waste material.As adopt round steel to make monoblock type high pressure straight tube through machining, and processing difficulties, waste of material is very big, and for the high pressure straight tube that certain-length is arranged, its pore can't drill through, so this method is not adopted by domestic manufacturer.
(3) summary of the invention: it is low to the objective of the invention is to solve the high pressure straight tube safety coefficient that adopts in the oil-gas field fracturing complete set of equipments that prior art makes, be prone to leakage, the problem that manufacturing cost is high provides the hot extrusion collection molding technique for pipe end of high-pressure straight pipe in a kind of oil-gas field fracturing complete set of equipments.
Technical scheme of the present invention is to adopt special mode of heating that pipe end is carried out the hot extrusion collection moulding.Technological difficulties are: caliber is little, tube wall is thin, long/directly (3.5: 1) compression ratio is big, and the pipe end unstability is serious, adopts the pipe end inside and outside wall after the common hot extrusion mode moulding very easily to occur folding and scrapping.
Moulding process of the present invention is characterized in that, technical process is: steel pipe blanking → pipe end adopts the mode of temperature gradient curve to heat → scale removal → carry out hot extrusion collection moulding → check with mould to put in storage on the hot-press forging manufacturing apparatus.
The heating-up temperature of pipe end described in the present invention gradient curve starting point is 900 ℃～1050 ℃, and the middle part maximum temperature is 1050 ℃-1200 ℃, and outlet temperature is 850 ℃.
Among the present invention, pipe end adopts the mode of temperature gradient curve to heat and push collection molding technique with mould on the hot-press forging manufacturing apparatus in the described technical process, is to adopt one or many to repeat to add hot extrusion molding.
The present invention is based on following basic principle design: any metal material is in allowing the temperature range of forging, the thermal deformation drag is hurried along with the rising of temperature in the capital reduces; thin-wall steel tube is when hot extrusion; if the temperature of pipe end heating is consistent or a little more than other position; then pipe end is not because of contacting with die cavity, and the temperature short time is interior, and (2-5s) is cold does not get off, and resistance of deformation is little; deform earlier under the effect of thrust, thereby makes phenomenons such as rousing, give out a contract for a project, crumple has appearred in tube end.Under the continuation effect of thrust, then the pipe end after the moulding scraps part with regard to deep wrinkle having occurred.
And used the heating means of temperature gradient curve, the temperature that makes the pipe heated end portion is a little less than pipe heating middle part, and a little more than pipe heating afterbody, then the tube end resistance of deformation is big, thereby thrust is delivered to pipe heating middle part, it is at first deformed, be full of die cavity, then under the further effect of thrust, make the final extrusion modling of pipe end, the product of producing like this has rational metal streamline structure, does not have wrinkle, meet technological requirement fully, meet customer need.
The present invention has realized the moulding of the big compression ratio (more than 3.5: 1) in length/footpath, the tube wall amount of swelling reaches 2.3 times, its technology advanced person, production cost reduces, the constant product quality that adopts the present invention to make, dependable performance, product qualification rate reaching have thoroughly solved the difficult problem that existing assembly type high pressure straight tube is prone to leakage more than 98%.
(4) description of drawings:
Fig. 1 is a high pressure straight tube master cutaway view;
Fig. 2 is pipe end heating-up temperature gradient curve figure of the present invention.
Among the figure: 1-high pressure straight tube small end, 2-high pressure straight tube, the big end of 3-high pressure straight tube, 4-temperature upper limit curve, 5-lowest temperature curve, 6-temperature intermediate curve.
(5) specific embodiment:
" the oil-gas field fracturing complete set of equipments high pressure straight tube 2 of 1502 type L=1000mm; its structure is referring to Fig. 1, and its finished product length overall is 1000mm adopts φ 65 * 11mm seamless pipe to upset and makes; big end (right-hand member among the figure) external diameter φ 110mm, small end (left end among the figure) external diameter is φ 87mm to adopt the present invention to make one 2.
Processing technology is as follows: 1. get the blanking of φ 65 * 11mm seamless pipe, length overall is 1270mm; 2. the big end 3:a. of processing high pressure straight tube will manage the material right-hand member and put into heating furnace heating for the first time, and heat by the upper limit curve 4 of the heating-up temperature gradient curve among Fig. 2, heated length is 330～350mm (total compression length is 160mm), pipe heated end portion (pipe material right-hand member head) temperature is 1050 ℃, pipe heating middle part maximum temperature is 1200 ℃, and pipe heating afterbody temperature is 850 ℃; B. scale removal; C. on the hot-press forging manufacturing apparatus, carry out the hot extrusion molding first time (finishing 75% compression) with mould; D. will manage the material right-hand member and put into heating furnace heating for the second time once more, and heat by the lower limit curve 5 of the heating-up temperature gradient curve among Fig. 2; Heated length is 200～220mm (because of being compressed 120mm), and pipe heated end portion temperature is 900 ℃, and pipe heating middle part maximum temperature is 1050 ℃, and pipe heating afterbody temperature is 850 ℃; E. on the hot-press forging manufacturing apparatus, carry out the hot extrusion molding second time with mould; 3. processing high pressure straight tube small end 1:a. will manage the material left end and put into heating furnace, and heat by the intermediate curve 6 in the heating-up temperature gradient curve zone among Fig. 2.Heated length is 280～300mm (reduction length is 110mm), and pipe heated end portion (pipe material left end head) temperature is 975 ℃, and pipe heating middle part maximum temperature is 1125 ℃, and pipe heating afterbody temperature is 850 ℃; B. scale removal; C. on the hot-press forging manufacturing apparatus, carry out the hot extrusion one-shot forming with mould; 4. check is put in storage.
Claims (3)
1. the hot extrusion collection molding technique for pipe end of high-pressure straight pipe in the oil-gas field fracturing complete set of equipments, it is characterized in that technical process is: steel pipe blanking → pipe end adopts the mode of temperature gradient curve to heat → scale removal → carry out hot extrusion collection moulding → check with mould to put in storage on the hot-press forging manufacturing apparatus.
2. the hot extrusion collection molding technique for pipe end of high-pressure straight pipe in a kind of oil-gas field fracturing complete set of equipments according to claim 1, it is characterized in that: described pipe end heating-up temperature gradient curve starting point is 900 ℃～1050 ℃, the middle part maximum temperature is 1050 ℃-1200 ℃, and terminal point is 850 ℃ of minimum temperatures.
3. the hot extrusion collection molding technique for pipe end of high-pressure straight pipe in a kind of oil-gas field fracturing complete set of equipments according to claim 1, it is characterized in that: pipe end adopts the mode of temperature gradient curve to heat and push collection molding technique with mould on the hot-press forging manufacturing apparatus in the described technical process, is to adopt one or many to repeat to add hot extrusion to be gathered into type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610018715 CN101049615A (en) | 2006-04-05 | 2006-04-05 | Hot extrusion collection molding technique for pipe end of high-pressure straight pipe in fracturing complete sets of equipment in oil-gas field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610018715 CN101049615A (en) | 2006-04-05 | 2006-04-05 | Hot extrusion collection molding technique for pipe end of high-pressure straight pipe in fracturing complete sets of equipment in oil-gas field |
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| Publication Number | Publication Date |
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| CN101049615A true CN101049615A (en) | 2007-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200610018715 Pending CN101049615A (en) | 2006-04-05 | 2006-04-05 | Hot extrusion collection molding technique for pipe end of high-pressure straight pipe in fracturing complete sets of equipment in oil-gas field |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101869928B (en) * | 2010-02-08 | 2012-11-28 | 厦门市育明工程机械有限公司 | Hydraulic steel pipe connector and extrusion forming method and production device thereof |
| CN103386451A (en) * | 2012-05-09 | 2013-11-13 | 雷帮荣 | Forming process of large-diameter piston plug, step shaft or oil cylinder and processing equipment thereof |
-
2006
- 2006-04-05 CN CN 200610018715 patent/CN101049615A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101869928B (en) * | 2010-02-08 | 2012-11-28 | 厦门市育明工程机械有限公司 | Hydraulic steel pipe connector and extrusion forming method and production device thereof |
| CN103386451A (en) * | 2012-05-09 | 2013-11-13 | 雷帮荣 | Forming process of large-diameter piston plug, step shaft or oil cylinder and processing equipment thereof |
| CN103386451B (en) * | 2012-05-09 | 2015-07-08 | 雷帮荣 | Forming process of large-diameter piston plug, step shaft or oil cylinder and processing equipment thereof |
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