CN1190617C - Cylinder shape pipe piece with inner harden layer and production method and equipment - Google Patents
Cylinder shape pipe piece with inner harden layer and production method and equipment Download PDFInfo
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- CN1190617C CN1190617C CNB031119085A CN03111908A CN1190617C CN 1190617 C CN1190617 C CN 1190617C CN B031119085 A CNB031119085 A CN B031119085A CN 03111908 A CN03111908 A CN 03111908A CN 1190617 C CN1190617 C CN 1190617C
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Abstract
The present invention relates to a cylinder-shaped pipe member with a hardening layer on the inner surface, a manufacture method thereof and special equipment. The pipe member has the advantages that the thickness of the wall is thin, the length is long, the hardness of the inner pipe wall and the outer pipe wall is different, and the inner layer is harder than the outer layer and is suitable for being used for conveying materials with a high frictional coefficient. The manufacture method is that the motion mode of a pipe member is controlled by frequency, a suitable quenching temperature range is adopted, the structure of the special equipment is simple, the operation is stable, the quenching temperature, the moving speed of a pipe member and the thickness of the hardening layer can be controlled accurately.
Description
Technical field
The present invention relates to a kind of quenching garden tubular pipe fitting and process for quenching and special device.This garden tubular pipe fitting comprises the concrete delivery pipe that use a kind of building site, but the present invention is not limited to concrete delivery pipe.Use in the quenching operation of the garden tubular pipe fitting that described method and special device thereof are suitable for that bore is big, tube wall is thin, length is long.
Background technique
In the prior art, the large-size pipe that uses in the concrete delivery pipe that the building site is used or other similar engineering technology requires its inboard wall of tube body to have higher hardness, carries the wearing and tearing of coarse-grained material to inboard wall of tube body to slow down; Simultaneously, because body often suffers external impact in transportation or working procedure, thereby the toughness that requires tube wall to have to prevent the crack from producing, promptly tube wall hardness is less than the hardness of its inwall, to improve the shock resistance of tube wall, avoids fracture.In addition, also have the characteristics that bore is big, wall thickness is little, length is long in order to the pipe fitting of delivering concrete, external diameter has 130-150mm usually, more than the reached 200mm that has; Length can reach 2-4 rice or more grow to 7 meters; And wall thickness generally is no more than 5mm.Therefore its quench-hardened case thickness can not be too thick, preferably is no more than the scope of 1/2 wall thickness, and require evenly necessary.Do not seen at present in order to the pipe fitting that satisfies above-mentioned condition that use was arranged.Majority still uses common pipe fitting.
Processing method in order to the garden tubular pipe fitting that satisfies above-mentioned inside and outside wall different hardness quality requirement simultaneously, normally heat-treat improving its hardness tube wall and then keep original than low hardness from the certain thickness zone of outer wall to inboard wall of tube body and from inwall certain thickness zone.Above-mentioned heat treatment method mainly contains two kinds, and the one, adopt the process for quenching of spraying water and cooling off after the flame heating; The 2nd, the process for quenching of water spray (cooling liquid) cooling after the employing electromagnetic induction heating.
The flame heating method is because its flame temperature is difficult for grasp, and overheated easily, heat penetration is difficult to control, the quenching effect instability, thereby only be applied in the bigger pipe fitting heat treatment step of some wall thickness, in the heat treatment of thin-wall pipe, do not appear in the newspapers.
High-frequency electromagnetic induction heat treatment be use at present more a kind of to garden tubular pipe fitting heat-treating process method.Open as the Japanese patent gazette spy that clear 59-77979 number and Japanese patent gazette are special is willing to that flat 7-299997 disclosed method all relates to the method for pipe fitting inner wall being carried out high frequency hardening.The application of the two all is short tubes small-bore and that length is little.
The technological scheme that Chinese patent 92109663.1 discloses a kind of " steel pipe with hardened wear-proof inner wall and processing device ".
This technological scheme is that the conveying material pipeline need use the inwall wear-resistant steel pipe and design in the industry such as generating, coal, thus deducibility its belong to heavy caliber, long garden bobbin spare.The quench-hardened case thickness of this quenching pipe fitting can reach 5mm deeply, and hardness can reach Ge Shi more than 50.Above-mentioned quench-hardened case data are obviously improper for the pipe fitting that wall thickness is no more than 5mm, and the hardness of Ge Shi 50 is low too for the pipe fitting that highly friction loss and wall thickness are very thin for working environment simultaneously.
The device of processing above-mentioned quenching pipe fitting as shown in Figure 6, this processing device connects 19 and 20 two worktable by guide rail 3, chucking platform 7 is wherein arranged on the worktable 19, one end of processed pipe fitting 18 is fixed on the chucking platform 7, motor 8 links to each other with chucking platform 7 by drivign belt, and two cover upper saw pulleys 5 are arranged on the periphery of pipe fitting 18.The gearbox 2 that motor 1 is arranged on the worktable 20 and link to each other with this motor 1, gearbox 2 connects main shaft 6 by coupling 4, there is pipeline 13,14 to be respectively oxygen hose and acetylene tracheae (when using electromagnetic induction heater in the hollow main shaft 6, above-mentioned pipeline 13 and 14 is a cable trunk) and shower 15, its movable joint is drawn at axle top respectively.During operation two worktable 19 and 20 can before and after slide, pipe fitting 18 and main shaft 6 are all rotatable.
First embodiment of this device is to be used for flame heating quenching technical process, but adopts this method to have foregoing number of drawbacks, especially can not be used for processing and the similar thin-wall pipe of aforementioned concrete delivery pipe.
Second embodiment of said apparatus is to adopt the electromagnetic induction heating mode, but there is the following defective that is difficult to overcome in the enforcement of this scheme: at first, one end of processed pipe fitting is fixing by chucking platform 7, if pipe fitting 18 rotations in course of working, then length (generally should be at 3-5 rice owing to pipe fitting, reached at the 6-7 rice that has), its the other end can be swung, be pipe fitting two ends rotation decentraction,, reduce the swing of pipe fitting though upper saw pulley 5 can play the support effect to pipe fitting, but because gap very little (being generally 2-3mm) between electromagnetic induction head and the inboard wall of tube body, even swing is slightly arranged, just might come in contact with tube wall, cause short circuit current.As want to avoid above-mentioned situation to take place, and the gap can be strengthened, but so just load must be increased, also can reduce the pipe fitting travelling speed.These two all can increase energy consumption, strengthens cost of production.If processed pipe fitting 18 and chucking platform are motionless, by main shaft 6 rotation, then it can drive the raceway for wiring 13,14 at rear portion and water pipe 15 and rotates simultaneously and be wrapped on the main shaft 6, and after the quenching operation was finished, counterrotating was to make each pipeline in order again.If pipe fitting is longer, then midway must pipeline of reason.Working efficiency is difficult to improve, and from practical standpoint, is difficult to get the nod.
Secondly, the power motor rotational speed of two worktable is constant, is unfavorable for adjusting rotating speed arbitrarily according to working condition and workpiece situation.Though worktable 20 has adopted gearbox 2 can adjust main axis rotation speed, its regulation range is very limited, and impracticable.
Summary of the invention
The present invention is directed to the deficiency that above-mentioned prior art exists, a kind of garden tubular pipe fitting with internal hardened layer is provided, this garden tubular pipe fitting has body length, thin, the inside and outside different characteristics of hardness of tube wall of tube wall.Described production method and special device thereof with garden tubular pipe fitting of internal hardened layer.Method of the present invention can be quenched from the controllable degree of depth of inner surface of tube body by pipe fitting long to body, that tube wall is thin.Special device of the present invention can make pipe fitting smooth running in quenching process, motion speed adjust at any time, and continuous variation pattern is adopted in the variation of speed.
Garden tubular pipe fitting with internal hardened layer of the present invention, the construction layer composition of this garden tubular pipe fitting is a middle-carbon steel, the certain zone of described pipe fitting from inner surface of tube body to wall thickness is quench-hardened case, beyond this quench-hardened case is non-quench-hardened case, the wall thickness of described garden tubular pipe fitting is 4-6mm, and quench-hardened case thickness is 2-2.5mm, and hardened layer hardness is HRC55-60, non-hardened layer hardness is HRC30-35, and described garden tubular pipe fitting length is 1-7 rice.
Described garden tubular pipe fitting with internal hardened layer, its hardened layer hardness is HRC56-58, garden tubular pipe fitting length is 3-4 rice, wall thickness 4.5-5mm.
Produce described method with garden tubular pipe fitting of internal hardened layer, the quenching technical that employing is carried out high-frequency induction heating and cooled off rapidly by the pipe fitting internal surface, described pipe fitting is horizontally disposed with, inductor extend into the pipe fitting another port from an end of pipe fitting, in quenching process, pipe fitting along continuous straight runs when rotating incessantly moves backward, described inductor with the process of pipe fitting relative movement in institute is heated to Ac from pipe fitting inner wall to being no more than interval, tube wall thickness 1/2 place through the zone
3Point is above, Ac
3Temperature below point+100 ℃ is heated interval temperature at this and drops to Ac
3Begin the water spray cooling before the point, make described pipe fitting be heated interval quench hardening, the rotational speed of described pipe fitting is adjustable, and the adjustment of this rotating speed adopts frequency to adjust mode.
Described production has the method for the garden tubular pipe fitting of internal hardened layer, and its heating-up temperature is Ac
3Point+80-100 ℃.
The rotational speed of described pipe fitting is 7-10Hz, between the inductor occurrence frequency scope 200-250KHz.
Production has the special device of the garden tubular pipe fitting of internal hardened layer, comprise worktable, side at worktable is provided with the high-frequency inductor fixing frame, high-frequency inductor links to each other with the high-frequency inductor fixing frame by a concentric cable, on worktable, whenever keep at a certain distance away and be provided with supporting wheel, be fixed with on the worktable and order about the power motor that the quenching pipe fitting rotates, on the described worktable support is arranged, support bottom and described supporting wheel relative position are provided with live axle, driving wheel is fixed on the live axle, described power motor is a frequency control motor, and described frequency control motor links to each other by drivign belt with live axle.
Described production has the special device of the garden tubular pipe fitting of internal hardened layer, and driving wheel is made up of two or more at least driving wheels, and each driving wheel compartment of terrain is fixed on the live axle, and drivign belt links to each other with live axle.
Described production has the special device of the garden tubular pipe fitting of internal hardened layer, and it is adjustable that an angle and this angle are arranged between supporting wheel and/or the driving wheel.
Production has the special device of the garden tubular pipe fitting of internal hardened layer, and drivign belt is a toothed belt.
Described production has the special device of the garden tubular pipe fitting of internal hardened layer, and frequency control motor is fixed on the top of support.
It is big that garden tubular pipe fitting with internal hardened layer of the present invention has a bore, characteristics such as wall thickness and length are long, because the hardness in inner surface of tube body certain thickness zone reaches 55-60HRC, the requirement of carrying can be satisfied fully, the body material can be saved in a large number such as the bigger Coarse Aggregate of friction ractor such as concrete, water coal slurry.Be high toughness owing to outer surface of tube body has less hardness again, therefore, it reaches the construction site and can tolerate the collision of frequent experience between the spreadable life and be not easy to produce the crack so that fracture in transportation process.Owing to above-mentioned two big characteristics are arranged, thereby body can be very thin, only has about 5mm, saved a large amount of raw material, alleviated body weight, be beneficial to transportation and construction and installation.
Production of the present invention has the method for the garden tubular pipe fitting of internal hardened layer, owing to adopt the frequency speed governing, makes travelling speed steady, and velocity variations keeps continuity, can not produce the jumping characteristic speed change.Adopt the 200-250KHz frequency range, can make the heating-up temperature between quench zone reach necessary requirement rapidly, temperature with exterior domain between quench zone does not then reach the quenching transformation temperature, can guarantee to obtain desirable quench-hardened case thickness, and remaining part then keeps original lower hardness.Selection is no more than body wall thickness 1/2 interval range and reaches quenching temperature, is to have high hardness in order to obtain inboard wall of tube body certain thickness scope, and it is original in low hardness and bigger toughness that the inside certain thickness scope of tube wall then keeps.Select heating-up temperature at Ac
3More than the point, Ac
3Below point+100 ℃, form uniform austenite structure rapidly in can making between quench zone, obtain the martensitic structure of homogeneous after the water spray cooling.Ac
3Point+80-100 ℃ temperature range is the optimum temperature that reaches above-mentioned quenching structure.
The special device that production of the present invention has the garden tubular pipe fitting of internal hardened layer has following advantage:
(1) adopt frequency control motor to drive the driving wheel rotation, as the motive force of quenching pipe fitting advance and retreat, its stable working by belt, rotating speed is even, speed can be adjusted at any time, meets the travelling speed that voltage instability is regularly in time adjusted the quenching pipe fitting, and is unaffected to guarantee the quenching quality.
(2) belt transmission cooperates speed-adjustable motor to be achieved smoothly adjustable-speed, be variation continuously during velocity variations promptly, but not the variation of jump type; Select toothed belt then can avoid belt slippage to cause stall, influence the quenching quality as drivign belt.
(3) adopt driving wheel (driving wheel) and supporting wheel acting in conjunction, order about the rotation of quenching pipe fitting, avoided driving the drawback of the next body swing of pipe fitting rotating band, rotation decentraction fully from the body end by the body position; If adopt (driving wheel) acting in conjunction of two or more driving wheels then effect is better.
(4) will be between driving wheel and/or the supporting wheel form certain angle, promptly the two is not parallel, produce thrust when pipe fitting is rotated and move horizontally voluntarily in angle, and this travelling speed can be adjusted by the rotating speed of speed-adjustable motor.
(5) adopt this equipment and select suitable electrical quantity, can accurately control heating-up temperature, heating time, pipe fitting travelling speed and quench-hardened case thickness.
Description of drawings
Fig. 1 is the cross-sectional schematic with garden tubular pipe fitting of internal hardened layer
Fig. 2 is the garden tubular pipe fitting hardness distribution with internal hardened layer
Fig. 3 is a special device structural representation of producing the garden tubular pipe fitting with internal hardened layer
Fig. 4 is body mother metal and 200 times of metallographs of inwall quench-hardened case
Fig. 5 is 500 times of metallographs of quench-hardened case
Fig. 6 is the structure drawing of device of available technology adopting flame heating or induction hardening
The non-quench-hardened case 112-of 1-high-frequency inductor fixing frame 2-concentric cable 3-support 4-high-frequency inductor 5-driving wheel 6-live axle 7-drivign belt 8-frequency control motor 9-supporting wheel 10-pipe fitting 11-worktable 111-quench-hardened case among the figure
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described in detail.
With the example of build concrete delivery pipe as the garden tubular pipe fitting with internal hardened layer, still described garden tubular pipe fitting with internal hardened layer is not limited to this member in following examples.
Employed concrete delivery pipe in construction engineering, because coagulation penus high strength abrasives, its wearing and tearing to inboard wall of tube body are very strong, in the work progress of some tall buildings, often because body wearing and tearing and the replacing delivery pipe of stopping work of having to midway.Cross quick-wearing in order to prevent tube wall, require inboard wall of tube body hardness should reach more than the HRC55, simultaneously because above-mentioned pipe fitting working environment is very abominable, and often change the job site, thereby transportation, loading and unloading and the collision in this process are inevitable, therefore, require the outer wall of pipe fitting should have lower hardness and high toughness, have certain impact strength to guarantee it.
The preferred embodiment of embodiment's 2 above-mentioned pipe fittings is, hardened layer hardness is HRC56-58, body wall thickness 4.5-5mm, and length is 3 meters.
Fig. 1 is described quenching pipe fitting internal structure schematic representation, shown in figure, a quench-hardened case 112 is arranged in pipe fitting inner wall certain thickness scope, and this quench-hardened case thickness is less than 1/2 of tube wall thickness.Outside the quench-hardened case non-quench-hardened case 111,
The method that embodiment 3 produces above-mentioned pipe fitting is to adopt high-frequency induction hardening technology, promptly carries out after the high-frequency induction heating quenching technical of cooling rapidly by inner surface of tube body, and detailed process is as follows:
A, pipe fitting are horizontally disposed with and high-frequency inductor are stretched to the another port from pipe fitting one end;
B, make garden tubular pipe fitting on one side around the axle center revolution, mobile backward vertically on one side; Meanwhile
C, connect the high-frequency inductor power supply, this moment inductor plate voltage 10-12KV, tank circuit voltage 9-11KV, anode current 12-14A, grid current 8-9A, inductor produce the vibration of 200-250KHz high-frequency electromagnetic, rotating speed of motor is 7-10Hz;
Body is heated to Ac from inboard wall of tube body to the interval that is no more than 1/2 body wall thickness around d, the inductor
3More than the point, Ac
3Temperature below point+100 ℃;
E, water spray cooling.
The quenching pipe fitting is of a size of bore 133mm, wall thickness 5mm, length 3m.
The rotational speed of above-mentioned pipe fitting can be adjusted, and realizes the adjustment of pipe fitting rotational speed by variable-frequency motor by adjusting frequency and then changing motor speed; After other condition was determined, the rotational speed of motor had determined the travelling speed of pipe fitting, and when above-mentioned motor speed was 7-10Hz, the travelling speed of pipe fitting was about 2mm/ second.
When present embodiment adopts electrical quantity among the above-mentioned c, realize the quench-hardened case thickness of described pipe fitting inner wall 2-2.5mm, pipe fitting is approximately 4-5 second heating time, the quenching heating of pipe fitting and about 4 seconds in the time lag of water spray cooling, and induction heating is mainly the conduction type heating.
The pipe fitting of embodiment 4 as use 45Mn2 and similar material, Ac can be selected in its optimum temperature interval
3Point+80-100 ℃.
Pipe fitting after quenching, its hardness profile as shown in Figure 2, from pipe fitting inner wall between less than wall thickness 1/2 in the zone (about 2 millimeter) be quench-hardened case, its hardness is between HRC56-58; Hardness descends gradually afterwards, and to the non-quench-hardened case zone of outer wall, hardness is HRC30-35 at wall thickness 1/2 place.
Fig. 4 is quench-hardened case and non-quench-hardened case metallograph, shows among the figure, and the metallographic structure after quenching becomes the martensitic structure of uniform and delicate, still is the austenite granulation tissue without organizing of quenching.
Fig. 5 is the quench-hardened case metallograph, shows among the figure that metallographic structure becomes uniform martensitic structure after quenching.
During work, pipe fitting 10 is put on the supporting wheel 9 of worktable 11 1 sides, the driving wheel 5 that is fixed on the support 3 closely contacts with body with supporting wheel 9, start frequency control motor 8, motor drives live axle 6 by belt 7 and rotates, and promptly drives driving wheel 5 and rotates, when driving wheel just changes, pipe fitting 3 moves to high-frequency inductor 4 one ends, this moment, motor speed can suitably be transferred soon, got the 50Hz frequency here, when high-frequency inductor 4 when the pipe fitting tail end is appeared, pipe fitting has entered job position, disable motor.Electric machine frequency is adjusted to 7Hz, and sense of rotation restarts for reversing, connect the high-frequency inductor power supply simultaneously, this moment, the movement direction of pipe fitting was to retreat, and the quenching operation begins, along with pipe fitting 10 moves lentamente, when high-frequency inductor withdraws from manage, finished quenching operation to the tube wall inboard.
Embodiment 6 causes stall for fear of belt slippage, influences the quenching quality, and aforesaid drivign belt 7 is selected toothed belt for use.
Claims (10)
1, a kind of garden tubular pipe fitting with internal hardened layer, the construction layer composition of this garden tubular pipe fitting is a middle-carbon steel, the certain zone of described pipe fitting from inner surface of tube body to wall thickness is quench-hardened case, beyond this quench-hardened case is non-quench-hardened case, the wall thickness that it is characterized in that described garden tubular pipe fitting is 4-6mm, and quench-hardened case thickness is 2-2.5mm, and hardened layer hardness is HRC55-60, non-hardened layer hardness is HRC30-35, and described garden tubular pipe fitting length is 1-7 rice.
2, the garden tubular pipe fitting with internal hardened layer as claimed in claim 1 is characterized in that described hardened layer hardness is HRC56-58, and garden tubular pipe fitting length is 3-4 rice, wall thickness 4.5-5mm.
3, a kind of production has the method for the garden tubular pipe fitting of internal hardened layer according to claim 1, the quenching technical that employing is carried out high-frequency induction heating and cooled off rapidly by the pipe fitting internal surface, described pipe fitting is horizontally disposed with, inductor extend into the pipe fitting another port from an end of pipe fitting, in quenching process, pipe fitting along continuous straight runs when rotating incessantly moves backward, it is characterized in that described inductor with the process of pipe fitting relative movement in institute is heated to Ac from pipe fitting inner wall to being no more than interval, tube wall thickness 1/2 place through the zone
3Point is above, Ac
3Temperature below point+100 ℃ is heated interval temperature at this and drops to Ac
3Begin the water spray cooling before the point, make described pipe fitting be heated interval quench hardening, the rotational speed of described pipe fitting is adjustable and the adjustment of its rotational speed adopts frequency to adjust mode.
4, have the method for the garden tubular pipe fitting of internal hardened layer as production as described in the claim 3, it is characterized in that described heating-up temperature is Ac
3Point+(80-100 ℃).
5, have the method for the garden tubular pipe fitting of internal hardened layer as production as described in claim 3 or 4, the rotational speed that it is characterized in that pipe fitting is 7-10Hz, between the inductor occurrence frequency scope 200-250KHz.
6, a kind ofly produce the equipment with garden tubular pipe fitting of internal hardened layer as claimed in claim 1, comprise worktable (11), side at worktable (11) is provided with high-frequency inductor fixing frame (1), high-frequency inductor (4) links to each other with high-frequency inductor fixing frame (1) by a concentric cable (2), on worktable (11), whenever keep at a certain distance away and be provided with supporting wheel (9), be fixed with on the worktable and order about the power motor (8) that the quenching pipe fitting rotates, it is characterized in that support (3) is arranged on the described worktable (11), support (3) bottom and described supporting wheel (9) relative position are provided with live axle (6), driving wheel (5) is fixed on the live axle (6), described power motor (8) is a frequency control motor, and described frequency control motor (8) links to each other by drivign belt (7) with live axle (6).
7, production as claimed in claim 6 has the equipment of the garden tubular pipe fitting of internal hardened layer, it is characterized in that described driving wheel (5) is made up of two or more at least driving wheels, each driving wheel compartment of terrain is fixed on the live axle (6), and drivign belt (7) links to each other with live axle (6).
8, have the equipment of the garden tubular pipe fitting of internal hardened layer as claim 6 or 7 described productions, it is characterized in that it is adjustable between described supporting wheel (9) and the driving wheel (5) an angle degree and this angle being arranged.
9, have the equipment of the garden tubular pipe fitting of internal hardened layer as claim 6 or 7 described productions, it is characterized in that described drivign belt (7) is a toothed belt.
10, have the equipment of the garden tubular pipe fitting of internal hardened layer as claim 6 or 7 described productions, it is characterized in that described frequency control motor (8) is fixed on the top of support (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031119085A CN1190617C (en) | 2003-02-24 | 2003-02-24 | Cylinder shape pipe piece with inner harden layer and production method and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031119085A CN1190617C (en) | 2003-02-24 | 2003-02-24 | Cylinder shape pipe piece with inner harden layer and production method and equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1433942A CN1433942A (en) | 2003-08-06 |
| CN1190617C true CN1190617C (en) | 2005-02-23 |
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ID=27634136
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031119085A Expired - Fee Related CN1190617C (en) | 2003-02-24 | 2003-02-24 | Cylinder shape pipe piece with inner harden layer and production method and equipment |
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|---|---|
| CN (1) | CN1190617C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006083412A (en) * | 2004-09-14 | 2006-03-30 | Ntn Corp | Induction heat treatment device, induction heat treatment method, and wrought product manufactured with the method |
| CN100335662C (en) * | 2005-01-28 | 2007-09-05 | 三一重工股份有限公司 | Production of concrete transporting pipes and special quenching apparatus thereof |
| KR100930733B1 (en) * | 2008-11-19 | 2009-12-09 | 주식회사 티엠시 | A concrete slurry transporting pipe for concrete pump-car |
| JP5839410B2 (en) * | 2011-07-13 | 2016-01-06 | トピー工業株式会社 | Heat treatment system and heat treatment method |
| CN102506267B (en) * | 2011-09-22 | 2015-12-09 | 三一汽车制造有限公司 | A kind of delivery pipe and manufacture method thereof, comprise the pumping machine of this delivery pipe |
| CN103014293B (en) * | 2012-12-20 | 2015-03-04 | 中联重科股份有限公司 | Straight round pipe positioning device and straight round pipe induction quenching equipment |
| CN105648190B (en) * | 2016-01-29 | 2018-12-07 | 宝山钢铁股份有限公司 | A method of improving steel pipe inner wall hardness |
| CN111485081B (en) * | 2020-05-26 | 2022-03-22 | 苏州辽鞍机械有限公司 | Quenching heat treatment method for pin bush |
| CN113618034B (en) * | 2021-07-30 | 2023-05-05 | 江苏徐工工程机械研究院有限公司 | Preparation method of conveying pipe and conveying pipe |
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2003
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| CN1433942A (en) | 2003-08-06 |
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