CN102500687B - Cold bulging method for stainless steel rectangular ring-rolled piece - Google Patents

Cold bulging method for stainless steel rectangular ring-rolled piece Download PDF

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CN102500687B
CN102500687B CN201110376977.XA CN201110376977A CN102500687B CN 102500687 B CN102500687 B CN 102500687B CN 201110376977 A CN201110376977 A CN 201110376977A CN 102500687 B CN102500687 B CN 102500687B
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bulging
rolling part
mill rolling
looping mill
time
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CN102500687A (en
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邹伟
魏志坚
江锦权
韩森霖
谭明明
刘建
刘彦成
奚晓
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AVIC Guizhou Anda Aviation Forging Co Ltd
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Guizhou Anda Aviation Forging Co Ltd
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Abstract

The invention discloses a cold bulging method for a stainless steel rectangular ring-rolled piece, which comprises the following steps of: assembling the cold-rolled stainless steel rectangular ring-rolled piece on the periphery of a bulging block in a bulging machine and starting the bulging machine to make the bulging block radially extrude the ring-rolled piece from the inner circumferential surface of the ring-rolled piece to finish first bulging, wherein the bulging time is 30-40 seconds, the dwelling time is 22-26 seconds, and the bulging deflection is 1.2-1.4 percent; rotating the ring-rolled piece by 45 degrees along a central axis to finish first rotation; carrying out second bulging according to the operation, wherein the bulging time is 30-40 seconds, the dwelling time is 23-27 seconds, and the bulging deflection is 1.3-1.5 percent; rotating the ring-rolled piece again according to a first rotating direction to finish second rotation; and carrying out third bulging according to the operation, wherein the bulging time is 30-40 seconds, the dwelling time is 25-28 seconds, and the bulging deflection is determined according to the difference between the inner diameter size of the ring-rolled piece subjected to the second bulging and the inner diameter size of a final product. The size accuracy of the bulged ring-rolled piece can be up to 1 per thousand of a corresponding size. The ring-rolled piece is manly applied to a cylindrical shell and other rotating body parts used in the fields of nuclear power and the like.

Description

The cold expanding method of stainless steel rectangular looping mill rolling part
Technical field
The present invention relates to a kind of expanding method of ring, particularly related to the cold expanding method of stainless steel rectangular looping mill rolling part.
Background technology
Stainless steel rectangular looping mill rolling part (referring to that longitudinal section is the looping mill rolling part of square-section) adopts after looping mill rolling, and owing to being subject to the impact of rolling mill practice and equipment limitation, its dimensional accuracy is generally not high; The in the situation that only more satisfactory at ring shape of rolling piece and equipment performance being more excellent, its dimensional accuracy just can reach 3 ‰ of corresponding size~5 ‰ (3/1000ths to 5/1000ths), and the looping mill rolling part after rolling is because stress is larger, if control the even defect such as cracking of bad easy generation warpage, distortion in following process operation.
On February 18th, 2009, disclosed Chinese invention patent description CN101367104A disclosed a kind of shroud ring, this process is by peripheral hardware high-pressure pump and make the highly pressurised liquid of its generation by the passage in high pressure cylinder, then via the passage subtracting in power post in mould part, inject fixing upper prod cast and mobile lower prod cast and the enclosure space of retaining ring formation, make retaining ring that plastic deformation occur under the effect of fluid pressure and carry out bulging retaining ring, to reach strengthening retaining ring, improve the object of retaining ring forming accuracy, from this patent specification accompanying drawing, can find out that described retaining ring is rectangle ring.The method is owing to being to lean on the flexible contact of the inner peripheral surface of liquid and ring to carry out cold expanding shape rectangle ring, and ability of its strengthening retaining ring and raising retaining ring forming accuracy is limited; And the method is for the also disclosure in detail of dimensional accuracy how to improve ring by bulging, just broadly draw and can reach the object that improves retaining ring forming accuracy, the method can not solve the low problem of looping mill rolling part dimensional accuracy existing in prior art.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of cold expanding method that adopts bulging piece to realize stainless steel rectangular looping mill rolling part, the method is carried out bulging by double small deformation amount and single compensation bulging to described stainless steel rectangular looping mill rolling part, has obtained the high bulging looping mill rolling part of dimensional accuracy.
For solving the problems of the technologies described above, the cold expanding method of stainless steel rectangular looping mill rolling part of the present invention, its technical scheme comprises the following steps:
Shape expanding machine is provided, and this shape expanding machine is mainly comprised of mandrel slide block, radial slider, bulging piece, workbench and guide rail; Described mandrel slide block is conical and is sleeved in radial slider and coordinates with the taper inner peripheral surface of radial slider, and can in radial slider, move up and down vertically extruding radial slide block; Described radial slider is 12 secter pats that separate, and is arranged on the guide rail of shape expanding machine and can radially moves around along guide rail, is installed with respectively bulging piece on the outer circumference surface of each secter pat, forms a toroidal when each secter pat closes up together with bulging piece; When described mandrel slide block moves down vertically in described radial slider, can make each radial slider radially synchronizing moving diffusion make bulging piece reach the object of bulging ring, when described mandrel slide block moves up vertically in radial slider shape expanding machine can drive each radial slider radially synchronizing moving close up and make bulging piece depart from the ring after bulging; On the workbench of this shape expanding machine, can drive in addition ring deflector roll along central axis rotation on this workbench;
Cold-rolling stainless steel straight-flanked ring rolled piece cover is put into shape expanding machine, make its inner ring surface be enclosed within the outer circumference surface periphery of bulging piece, now, radial slider is in closing up state;
Starting shape expanding machine applies axial tension F to mandrel slide block and it is moved down vertically and make the radially synchronizing moving diffusion of each radial slider along the endoporus conical surface extruding radial slide block of described radial slider, the bulging piece being contained on radial slider outer circumference surface radially pushes this looping mill rolling part from the inner circumferential surface of looping mill rolling part, looping mill rolling part generation dimension of inner and outer diameters expands and wall thickness reduction plastic deformation, completes bulging for the first time; In this Bulging Process, the bulging time of described looping mill rolling part is 30~40s, and the dwell time is 22~26s, and bulging deflection is 1.2%~1.4%;
Shape expanding machine drives mandrel slide block to move up vertically in radial slider, and drive radial slider radially synchronizing moving close up and make bulging piece depart from the looping mill rolling part after bulging, deflector roll on the workbench of startup shape expanding machine makes it drive described looping mill rolling part along 45 ° of central axis rotations, completes the rotation for the first time of looping mill rolling part;
By the operation of above-mentioned bulging for the first time, the looping mill rolling part through after bulging is for the first time carried out to bulging for the second time, in this Bulging Process, the bulging time of described looping mill rolling part is 30~40s, and the dwell time is 23~27s, and bulging deflection is 1.3%~1.5%;
Operation by above-mentioned rotation is for the first time rotated for the second time to the looping mill rolling part through after bulging for the second time, this rotation, and described looping mill rolling part rotates 45 ° in the same way again with direction of rotation for the first time;
By the operation of above-mentioned bulging for the first time, the looping mill rolling part through after bulging is for the second time carried out to bulging for the third time, in this Bulging Process, the bulging time of described looping mill rolling part is 30~40s, dwell time is 25~28s, and bulging amount is definite according to the internal diameter size of looping mill rolling part after bulging for the second time and the gap of final products internal diameter size;
After bulging finishes, the mandrel slide block that moves up, closes up radial slider, takes out the looping mill rolling part after bulging.
The stainless steel that the above-mentioned stainless steel preferred material trade mark is 1Mn18Cr18N.
The axial tension F that described shape expanding machine applies mandrel slide block is calculated as follows definite:
F=ξ×σ 0.2×S
In formula:
ξ---shape expanding machine bulge coefficient, the present invention gets 1.26~1.52;
σ 0.2---the yield strength (MPa) of stainless steel material, 1Mn18Cr18N gets 396MPa~555MPa;
Longitudinal section area (the mm of S---looping mill rolling part 2).
The bulging size of described looping mill rolling part is calculative determination as follows:
D=D 0+d
In formula:
The internal diameter size (mm) of D---looping mill rolling part after bulging;
D 0---the final products internal diameter size (mm) of looping mill rolling part;
D---the springback capacity (mm) of internal diameter size after looping mill rolling part bulging, the present invention gets 5~10mm.
Adopt the stainless steel rectangular looping mill rolling part of cold expanding method bulging of the present invention, its internal diameter size scope is Φ 400mm~Φ 4500mm, and wall thickness is 10mm~200mm, is highly 40mm~750mm.
Compared with prior art, beneficial effect of the present invention is as follows:
The present invention carries out rigidity by the bulging piece on shape expanding machine and stainless steel rectangular looping mill rolling part and contacts direct bulging, can further improve the strengthening effect of bulging to stainless steel rectangular looping mill rolling part, and can obtain needed bulging size and be conducive to improve dimensional accuracy.
The present invention carries out bulging by double small deformation amount and single compensation bulging to described stainless steel rectangular looping mill rolling part, and by selecting the technological parameters such as suitable bulging time and dwell time, can guarantee that stainless steel rectangular looping mill rolling part there will not be spalling phenomenon in Bulging Process, can also make the springback capacity of looping mill rolling part after each bulging be unlikely to too large; In Bulging Process, pass through 45 ° of twice rotating Vortexes of described looping mill rolling part, the vestige that gap in the time of can eliminating bulging piece and radially spread bulging between adjacent bulging piece forms looping mill rolling part inner peripheral surface, is conducive to carrying out smoothly and obtaining the bulging looping mill rolling part that dimensional accuracy is higher of Bulging Process; Because the bulging internal diameter size (D) of looping mill rolling part is the final products internal diameter size (D after bulging by looping mill rolling part 0) and looping mill rolling part bulging after the springback capacity (d) of internal diameter size carry out calculative determination, while adding cold expanding shape, the springback capacity of looping mill rolling part is larger, looping mill rolling part is through still having a small amount of springback capacity after bulging for the second time, therefore, carried out compensating for the third time bulging, bulging amount is determined according to the internal diameter size of looping mill rolling part after bulging for the second time and the gap of final products internal diameter size, so that the size after bulging and final products consistent size; In whole Bulging Process, because bulging piece can be measured the springback capacity of internal diameter size after the situation of change of looping mill rolling part internal diameter size and each bulging in real time, and measurement data is sent in time on the display of shape expanding machine, thereby when bulging the accurate bulging size of control loop rolled piece.In sum, adopt the looping mill rolling part of the method for the invention bulging can obtain the final products size that dimensional accuracy is higher.
In Bulging Process, axial tension F mandrel slide block being applied due to shape expanding machine is by the bulge coefficient (ξ) of shape expanding machine, the yield strength (σ of material 0.2) and the longitudinal section area (S) of looping mill rolling part determine, therefore, can determine the size of axial tension F for the looping mill rolling part of different shape expanding machines and different materials, size, make looping mill rolling part stressed more even more reasonable in Bulging Process, can guarantee carrying out smoothly of Bulging Process, avoid exerting oneself excessive cause spalling or exert oneself too smallly cause swollen motionless phenomenon to occur.
The stainless steel rectangular looping mill rolling part that the trade mark of take is 1Mn18Cr18N is example, the final products size of this stainless steel rectangular looping mill rolling part after bulging after testing, the dimensional accuracy of its internal diameter, wall thickness and height has reached respectively 1 ‰ of corresponding size, and without defects such as distortion, warpages.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is that straight-flanked ring rolled piece is along the profilograph of its center line.
Fig. 2 is the structure diagram of shape expanding machine.
Fig. 3 is the installation schematic diagram of straight-flanked ring rolled piece.
Fig. 4 is the cold Bulging Process schematic diagram of straight-flanked ring rolled piece.
Fig. 5 is the schematic diagram that bulging piece departs from the straight-flanked ring rolled piece after bulging.
The specific embodiment
The cold expanding method of implementing stainless steel rectangular looping mill rolling part of the present invention need to provide the equipment such as shape expanding machine, manipulator.The stainless steel that China's material trademark of take is below 1Mn18Cr18N describes the specific embodiment of the method in detail as example:
The main chemical elements content (percentage by weight) of this alloy is: C content≤0.1%, containing Si≤0.8%, containing Mn amount 17.5%~20.0%, containing P≤0.050%, containing S≤0.015%, containing Cr amount 17.5%~20.0%, containing N >=0.50%, containing Al≤0.025%, containing B≤0.001%, all the other analyze reference.
For implement cold expanding method of the present invention shape expanding machine structure diagram as shown in Figure 2, this shape expanding machine is mainly comprised of mandrel slide block 1, radial slider 2, bulging piece 3, workbench 4 and guide rail 5.Mandrel slide block 1 is conical and is sleeved in radial slider 2 and coordinates with the taper inner peripheral surface of radial slider 2, and mandrel slide block 1 can be driven and in radial slider 2, be moved up and down vertically and extruding radial slide block 2 by the hydraulic cylinder of shape expanding machine; Radial slider 2 is arranged on the guide rail 5 of shape expanding machine and can radially moves around along guide rail 5, radial slider 2 is overlooked direction from Fig. 2 and is seen it is 12 secter pat shapes of separating, on the outer circumference surface of each secter pat, be installed with respectively bulging piece 3, when each secter pat closes up, can form a toroidal together with bulging piece 3; When mandrel slide block 1 moves down vertically in radial slider 2, can make each radial slider 2 radially synchronizing moving diffusion make bulging piece 3 reach the object of bulging ring, when mandrel slide block 1 moves up vertically in radial slider 2 shape expanding machine can drive each radial slider 2 radially synchronizing moving close up and make bulging piece 3 depart from the ring after bulgings, bulging piece 3 has real-time measurement ring internal diameter size and measurement data is sent to the function on the display of shape expanding machine in Bulging Process; In addition, on the workbench 4 of this shape expanding machine, can drive in addition ring deflector roll (not shown) along central axis rotation on this workbench.
The processing step that this alloy straight-flanked ring rolled piece carries out cold expanding shape is as follows:
Step 1: installation.
As shown in Figure 3,1Mn18Cr18N alloy straight-flanked ring rolled piece 10 cover shown in Fig. 1 is put into shape expanding machines, makes its inner ring surface be enclosed within the outer circumference surface of bulging piece 3 peripheral, its bottom surface lie in workbench 4 above, now, radial slider 2 is in closing up state.During installation, the shipment of workpiece mainly completes by Robot actions.
Step 2: bulging for the first time.
As shown in Figure 4, starting shape expanding machine makes its mandrel slide block 1 axially move down along it, mandrel slide block 1 makes the radially synchronizing moving diffusion of each radial slider 2 along its taper surface extruding radial slide block 2 radial slider 2 is interior, the outer circumference surface of the bulging piece 3 in radial slider 2 contacts with the inner circumferential surface of looping mill rolling part 10, and along the inner circumferential surface extrusion ring rolled piece 10 of looping mill rolling part 10, make looping mill rolling part 10 from inner circumferential surface to external peripheral surface, be subject to the radial compression power from bulging piece 3, cause the inner peripheral surface of looping mill rolling part 10 radially to expand, in looping mill rolling part 10 occurs, outside dimension expands, the plastic deformation of wall thickness reduction, looping mill rolling part 10 is by bulging piece 3 bulging for the first time, during bulging, the hydraulic cylinder of shape expanding machine applies axial tension F to mandrel slide block 1, the bulging time of looping mill rolling part 10 is 30~40s, dwell time is 22~26s, the bulging deflection of looping mill rolling part 10 is 1.2%~1.4%.
The described bulging time is the time after looping mill rolling part 10 is finished to bulging by bulging from the beginning; The described dwell time refers to after looping mill rolling part 10 is reached deflection by bulging and no longer deforms and remain to the time that bulging finishes always.
Step 3: rotation for the first time.
As shown in Figure 5, make shape expanding machine drive mandrel slide block 1 to move up vertically in radial slider 2, and drive radial slider 2 radially synchronizing moving close up and make bulging piece 3 depart from the looping mill rolling part 10 after bulgings, start deflector roll on the workbench 4 of shape expanding machine make its driving ring rolled piece 10 on this workbench along central axis clockwise or be rotated counterclockwise 45 °, thereby complete the rotation for the first time of looping mill rolling part 10.
Step 4: bulging for the second time.
The Bulging Process of repeating step 1 makes 3 pairs of looping mill rolling parts of bulging piece 10 carry out bulging for the second time, during bulging, the hydraulic cylinder of shape expanding machine applies axial tension F to mandrel slide block 1, the bulging time of looping mill rolling part 10 is 30~40s, dwell time is 23~27s, and the bulging deflection of looping mill rolling part 10 is 1.3%~1.5%.
Step 5: rotation for the second time.
Repeating step 3, makes the deflector roll driving ring rolled piece 10 of shape expanding machine and direction of rotation for the first time rotate in the same way 45 ° again, thereby completes the rotation for the second time of looping mill rolling part 10.
Step 6: bulging for the third time.
The Bulging Process of repeating step 1 makes 3 pairs of looping mill rolling parts of bulging piece 10 carry out bulging for the third time, during bulging, the hydraulic cylinder of shape expanding machine applies axial tension F to mandrel slide block 1, the bulging time of looping mill rolling part 10 is 30~40s, dwell time is 25~28s, and the internal diameter size of looping mill rolling part 10 and the gap of final products internal diameter size that bulging amount is measured according to bulging piece 3 after bulging are for the second time determined.
After three times bulging finishes, the mandrel slide block 1 that moves up, closes up radial slider 2 and makes bulging piece 3 depart from looping mill rolling part 10, thereby take out looping mill rolling part 10 with manipulator, completes Bulging Process.
Looping mill rolling part 10 is in Bulging Process, and described axial tension F is calculated as follows:
F=ξ×σ 0.2×S
In formula:
ξ---shape expanding machine bulge coefficient, the present invention gets 1.26~1.52;
σ 0.2---the yield strength (MPa) of stainless steel material, the present invention gets 396MPa~555MPa;
Longitudinal section area (the mm of S---looping mill rolling part 10 2);
The computational methods of the bulging deflection of described looping mill rolling part 10 are: bulging deflection=[the central diameter size of looping mill rolling part 10 before (the central diameter size of the front looping mill rolling part 10 of the central diameter size-bulging of looping mill rolling part 10 after bulging)/bulging] * 100%.
The central diameter size of described looping mill rolling part 10=(outside dimension of internal diameter size+looping mill rolling part 10 of looping mill rolling part 10) ÷ 2
For guaranteeing that looping mill rolling part 10 can access the final size of product requirement after bulging, the bulging size of looping mill rolling part 10 calculates as follows:
D=D 0+d
In formula:
The internal diameter size (mm) of D---looping mill rolling part 10 after bulging;
D 0---the final products internal diameter size (mm) of looping mill rolling part 10;
D---the springback capacity (mm) of internal diameter size after looping mill rolling part 10 bulgings, the present invention gets 5~10mm.
The stainless steel rectangular looping mill rolling part that adopts said method bulging, its internal diameter size scope is: Φ 400mm~Φ 4500mm, wall thickness is 10mm~200mm, is highly 40mm~750mm.

Claims (5)

1. a cold expanding method for stainless steel rectangular looping mill rolling part, is characterized in that, comprises the following steps:
Shape expanding machine is provided, and this shape expanding machine is mainly comprised of mandrel slide block, radial slider, bulging piece, workbench and guide rail; Described mandrel slide block is conical and is sleeved in radial slider and coordinates with the taper inner peripheral surface of radial slider, and can in radial slider, move up and down vertically extruding radial slide block; Described radial slider is 12 secter pats that separate, and is arranged on the guide rail of shape expanding machine and can radially moves around along guide rail, is installed with respectively bulging piece on the outer circumference surface of each secter pat, forms a toroidal when each secter pat closes up together with bulging piece; When described mandrel slide block moves down vertically in described radial slider, can make each radial slider radially synchronizing moving diffusion make bulging piece reach the object of bulging ring, when described mandrel slide block moves up vertically in radial slider shape expanding machine can drive each radial slider radially synchronizing moving close up and make bulging piece depart from the ring after bulging; On the workbench of this shape expanding machine, can drive in addition ring deflector roll along central axis rotation on this workbench;
Cold-rolling stainless steel straight-flanked ring rolled piece cover is put into shape expanding machine, make its inner ring surface be enclosed within the outer circumference surface periphery of bulging piece, now, radial slider is in closing up state;
Starting shape expanding machine applies axial tension F to mandrel slide block and it is moved down vertically and make the radially synchronizing moving diffusion of each radial slider along the endoporus conical surface extruding radial slide block of described radial slider, the bulging piece being contained on radial slider outer circumference surface radially pushes this looping mill rolling part from the inner circumferential surface of looping mill rolling part, looping mill rolling part generation dimension of inner and outer diameters expands and wall thickness reduction plastic deformation, completes bulging for the first time; In this Bulging Process, the bulging time of described looping mill rolling part is 30~40s, and the dwell time is 22~26s, and bulging deflection is 1.2%~1.4%;
Shape expanding machine drives mandrel slide block to move up vertically in radial slider, and drive radial slider radially synchronizing moving close up and make bulging piece depart from the looping mill rolling part after bulging, deflector roll on the workbench of startup shape expanding machine makes it drive described looping mill rolling part along 45 ° of central axis rotations, completes the rotation for the first time of looping mill rolling part;
By the operation of above-mentioned bulging for the first time, the looping mill rolling part through after bulging is for the first time carried out to bulging for the second time, in this Bulging Process, the bulging time of described looping mill rolling part is 30~40s, and the dwell time is 23~27s, and bulging deflection is 1.3%~1.5%;
Operation by above-mentioned rotation is for the first time rotated for the second time to the looping mill rolling part through after bulging for the second time, this rotation, and described looping mill rolling part rotates 45 ° in the same way again with direction of rotation for the first time;
By the operation of above-mentioned bulging for the first time, the looping mill rolling part through after bulging is for the second time carried out to bulging for the third time, in this Bulging Process, the bulging time of described looping mill rolling part is 30~40s, dwell time is 25~28s, and bulging amount is definite according to the internal diameter size of looping mill rolling part after bulging for the second time and the gap of final products internal diameter size;
After bulging finishes, the mandrel slide block that moves up, closes up radial slider, takes out the looping mill rolling part after bulging.
2. the cold expanding method of straight-flanked ring rolled piece according to claim 1, is characterized in that: described stainless steel is 1Mn18Cr18N.
3. the cold expanding method of straight-flanked ring rolled piece according to claim 2, is characterized in that: the axial tension F that described shape expanding machine applies mandrel slide block is calculated as follows definite:
F=ξ×σ 0.2×S
In formula:
ξ---shape expanding machine bulge coefficient, gets 1.26~1.52;
σ 0.2---the yield strength MPa of stainless steel material, 1Mn18Cr18N gets 396MPa~555MPa;
The longitudinal section area mm of S---looping mill rolling part 2.
4. the cold expanding method of straight-flanked ring rolled piece according to claim 1 and 2, is characterized in that: the bulging size of described looping mill rolling part is calculative determination as follows:
D=D 0+d
In formula:
The internal diameter size mm of D---looping mill rolling part after bulging;
D 0---the final products internal diameter size mm of looping mill rolling part;
D---the springback capacity mm of internal diameter size after looping mill rolling part bulging, gets 5~10mm.
5. the cold expanding method of straight-flanked ring rolled piece according to claim 1 and 2, is characterized in that: the straight-flanked ring rolled piece of described bulging, and its internal diameter size scope is Φ 400mm~Φ 4500mm, wall thickness is 10mm~200mm, is highly 40mm~750mm.
CN201110376977.XA 2011-11-24 2011-11-24 Cold bulging method for stainless steel rectangular ring-rolled piece Active CN102500687B (en)

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CN108714656A (en) * 2018-03-23 2018-10-30 吴浩 The Thermal expansion method of hot die steel conical ring rolled piece

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CN2659585Y (en) * 2003-11-20 2004-12-01 吉欣(英德)热轧不锈复合钢有限公司 Diameter regulatable expander for hot rolled metal composite pipe
CN2850746Y (en) * 2005-12-16 2006-12-27 张勇 Cylinder enlarging machine
CN201423413Y (en) * 2009-06-23 2010-03-17 山东电力管道工程公司 Self-resetting device of steel ring expansion machine
CN201423412Y (en) * 2009-06-23 2010-03-17 山东电力管道工程公司 Steel ring expansion machine with limit device
CN201728304U (en) * 2010-04-01 2011-02-02 李建伟 Steel ring inflation cirque machine

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