CN113600630A - Drawing method of pipe - Google Patents
Drawing method of pipe Download PDFInfo
- Publication number
- CN113600630A CN113600630A CN202110907424.6A CN202110907424A CN113600630A CN 113600630 A CN113600630 A CN 113600630A CN 202110907424 A CN202110907424 A CN 202110907424A CN 113600630 A CN113600630 A CN 113600630A
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- pipe
- rotating wheel
- drawn
- sleeve
- auxiliary rotating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
- B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
Abstract
The invention provides a drawing method of a pipe, which comprises the following steps: providing a pipe to be drawn; sleeving a sleeve on the outer part of the pipe to be drawn; one end of the pipe to be drawn, which is sleeved with the sleeve, is placed on an auxiliary rotating wheel, and the pipe to be drawn, which is sleeved with the sleeve, is pushed by the auxiliary rotating wheel to enter a drawing die for drawing. The scheme provided by the invention utilizes the auxiliary rotating wheel and the sleeve, so that the deformation of single-pass drawing can be increased, the drawing passes can be reduced, the heat treatment times can be reduced, the drawing efficiency can be improved, and the drawing cost can be reduced.
Description
Technical Field
The invention relates to the technical field of precision metal processing, in particular to a drawing method of a pipe.
Background
At present, aiming at the problems that in the drawing process of a magnesium alloy micro-tube, due to poor plasticity of materials and large friction ratio, the drawing force is large, the tube is easy to break in the drawing process, the deformation of each pass is limited, the number of drawing passes is large, and the number of times of inter-pass annealing is large.
The area where deformation occurs in the drawing process is mainly concentrated in the conical surface area, wall reduction and diameter reduction of the pipe occur, the drawing force, the positive pressure of the conical surface area on the pipe and the friction force between the outer wall of the pipe and a mold are mainly used in the area, and if the drawing process is the drawing process with the core rod, the friction force between the core rod and the inner wall of the pipe is also used. For the drawing of the core rod, the friction force accounts for a large amount of the total drawing force, sometimes the friction force accounts for 60%, and the maximum friction force in the empty drawing process also can reach 40%, so that the drawing force is obviously improved, and the tube breakage is easy to occur in the tube drawing process.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a pipe drawing method, so that the single-pass drawing amount in the drawing process is increased, the drawing passes are reduced, and the drawing efficiency is improved.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a method of drawing a pipe comprising:
providing a pipe to be drawn;
sleeving a sleeve on the outer part of the pipe to be drawn;
one end of the pipe to be drawn, which is sleeved with the sleeve, is placed on an auxiliary rotating wheel, and the pipe to be drawn, which is sleeved with the sleeve, is pushed by the auxiliary rotating wheel to enter a drawing die for drawing.
Optionally, the method of placing one end of the pipe to be drawn, which is sleeved with the sleeve, on the auxiliary rotating wheel includes:
one end of the pipe to be drawn, which is sleeved with the sleeve, is placed on a first auxiliary rotating wheel and a second auxiliary rotating wheel of the auxiliary rotating wheel;
the first auxiliary rotating wheel and the second auxiliary rotating wheel are arranged in parallel.
Optionally, the auxiliary wheel pushes the sleeve to sleeve the pipe to be drawn to enter the drawing die for drawing, including:
the first auxiliary rotating wheel and the second auxiliary rotating wheel of the auxiliary rotating wheel push one end of the pipe to be drawn, which is sleeved with the sleeve, to enter the drawing die for drawing.
Optionally, the drawing method of the pipe further includes:
and one end of the pipe to be drawn, which is pushed out from the drawing die, is clamped by a clamp for drawing.
Optionally, the first auxiliary rotating wheel and the second auxiliary rotating wheel are provided with a hole pattern.
Optionally, a gap channel is arranged at a position where the first auxiliary rotating wheel and the second auxiliary rotating wheel are placed in parallel; the first auxiliary rotating wheel and the second auxiliary rotating wheel of the auxiliary rotating wheel push the end, sleeved with the sleeve, of the pipe to be drawn to enter the drawing die for drawing, and the drawing die comprises:
one end of the pipe to be drawn, which is sleeved with the sleeve, is placed at the gap channel, and the first auxiliary rotating wheel and the second auxiliary rotating wheel push the pipe to be drawn to enter the drawing die through the gap channel.
Optionally, the first auxiliary rotating wheel and the second auxiliary rotating wheel push the pipe to be drawn to enter the drawing die through the gap channel, including:
and the first auxiliary rotating wheel rotates anticlockwise according to a first rotating speed and the second auxiliary rotating wheel rotates clockwise according to a second rotating speed, so that the pipe to be drawn sleeved with the sleeve is pushed to enter the drawing die through the gap channel.
Optionally, the first rotating speed and the second rotating speed are both greater than the drawing speed; and the first rotating speed and the second rotating speed are consistent in size.
Optionally, the sleeve is provided with at least one gap penetrating the whole sleeve.
Optionally, the material strength of the sleeve is higher than that of the material of the pipe to be drawn.
The scheme of the invention at least comprises the following beneficial effects:
according to the scheme, the auxiliary rotating wheel and the sleeve are used in the drawing process, so that the influence of friction force on the pipe can be reduced, the single-pass deformation in the drawing process can be increased, and the drawing passes can be reduced.
Drawings
FIG. 1 is a schematic drawing of the drawing process of the present invention;
FIG. 2 is a schematic cross-sectional view of a sleeved tubing of the present invention;
FIG. 3 is a schematic view of the auxiliary wheel of the present invention.
The reference numbers illustrate: 1. a first auxiliary runner; 2. a second auxiliary runner; 3. a pipe sleeved with a sleeve; 4. drawing the die; 5. a clamp; 6. a void; 7. a pipe to be drawn; 8. a sleeve.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As shown in fig. 1, an embodiment of the present invention provides a method for drawing a pipe, including: providing a pipe 7 to be drawn; sleeving a sleeve 8 on the outer part of the pipe 7 to be drawn; one end of the pipe 7 to be drawn, which is sleeved with the sleeve 8, is placed on an auxiliary rotating wheel, and the pipe 7 to be drawn, which is sleeved with the sleeve 8, is pushed by the auxiliary rotating wheel to enter a drawing die 4 for drawing.
In this embodiment, a sleeve 8 is sleeved on the outer part of the pipe 7 to be drawn, the length of the sleeve 8 should be greater than or equal to the length of the pipe 7 to be drawn, and during the drawing process, the sleeve 8 changes the state of the friction force applied to the pipe 7 to be drawn: changing the dynamic friction between the pipe 7 to be drawn and the drawing die 4 into static friction to ensure that the pipe 7 to be drawn does not break in the drawing process; the static friction is equivalent to the internal force between the sleeve 8 and the pipe 7 to be drawn, has no influence on the overall drawing force, can improve the single-pass deformation in the drawing process, reduces the drawing passes and improves the processing efficiency. When the pipe diameter of the pipe 7 to be drawn is small, the sleeve 8 is sleeved on the outer portion of the pipe 7 to be drawn, which is equivalent to the increase of the overall diameter, the sleeve 8 can be replaced according to the change of the diameter of the pipe 7 to be drawn, and the drawing processing of the alloy pipe with small size is realized under the condition that the existing die is not replaced. Meanwhile, due to the action of the sleeve 8, the taper angle of the conical surface area of the drawing die 4 is reduced, which is beneficial to the deformation of the pipe 7 to be drawn.
Placing one end of the pipe 7 to be drawn sleeved with the sleeve 8 on an auxiliary rotating wheel, and pushing the pipe 7 to be drawn sleeved with the sleeve 8 into a drawing die 4 for drawing by using a driving force generated by the rotation of the auxiliary rotating wheel; meanwhile, the auxiliary rotating wheel can provide certain compressive stress, the stress state of the pipe 7 to be drawn in the conical surface area of the drawing die 4 is changed, and the drawing efficiency is further improved.
In an alternative embodiment of the present invention, as shown in fig. 3, the step of placing one end of the pipe 7 to be drawn, which is sleeved with the sleeve 8, on an auxiliary wheel comprises: one end of the pipe 7 to be drawn, which is sleeved with the sleeve 8, is placed on a first auxiliary rotating wheel 1 and a second auxiliary rotating wheel 2 of the auxiliary rotating wheels; the first auxiliary turning wheel 1 and the second auxiliary turning wheel 2 are placed in parallel.
In this embodiment, the auxiliary runner includes a first auxiliary runner 1, a second auxiliary runner 2; the sizes and the structures of the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2 are completely consistent, and the descriptions of "first" and "second" are only used for distinguishing the auxiliary rotating wheels, and do not limit the sizes and the positions of the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2; placing one end of the pipe 7 to be drawn, sleeved with the sleeve 8, on the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2, and pushing the pipe 7 to be drawn to move towards the drawing die 4 by the rotation of the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2; and the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2 are arranged in parallel, and the pipe 7 to be drawn, which is sleeved with the sleeve 8, is arranged at a parallel position.
In an optional embodiment of the present invention, the step of pushing the to-be-drawn pipe 7 sleeved with the sleeve 8 into the drawing die 4 by the auxiliary wheel for drawing includes: the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2 of the auxiliary rotating wheel push one end of the pipe 7 to be drawn, which is sleeved with the sleeve 8, to enter the drawing die 4 for drawing.
In this embodiment, the pipe 7 to be drawn, which is sleeved with the sleeve 8, passes through the auxiliary rotating wheel before being drawn, and one end of the pipe 7 to be drawn, which is sleeved with the sleeve 8, enters the drawing die 4 to be drawn under the pushing of the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2 of the auxiliary rotating wheel. The first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2 provide driving force which is equivalent to the sleeve 8 which is sleeved with the pipe 7 to be drawn and applies extrusion force, so that the drawing of the drawing die 4 is facilitated.
Optionally, the sleeve 8 is sleeved on one end of the pipe 7 to be drawn, the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2 of the auxiliary rotating wheel push the drawing die 4 to draw, and one end of the drawing die 4 is pushed out and clamped by the clamp 5 to draw.
In an optional embodiment of the present invention, a gap channel is disposed at a position where the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2 are placed in parallel; the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2 of the auxiliary rotating wheel push one end of the pipe 7 to be drawn, sleeved with the sleeve 8, to enter the drawing die 4 for drawing, and the drawing method comprises the following steps: one end of the pipe 7 to be drawn, sleeved with the sleeve 8, is placed at a gap channel, and the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2 push the pipe 7 to be drawn, sleeved with the sleeve 8, to enter the drawing die 4 through the gap channel.
In this embodiment, a gap channel is arranged at a position where the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2 are placed in parallel; when drawing, the end of the pipe 7 to be drawn, which is sleeved with the sleeve 8, is placed at the gap passage, and the pipe 7 to be drawn, which is sleeved with the sleeve 8, is pushed by the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2 to enter the drawing die 4 through the gap passage to be drawn.
Optionally, the first auxiliary runner 1 and the second auxiliary runner 2 are both provided with a hole pattern; during drawing, the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2 with different hole patterns can be selected according to the size of the outer diameter of the pipe 7 to be drawn sleeved with the sleeve 8; meanwhile, the sizes and hole types of the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2 are selected to be consistent, so that the pipe 7 to be drawn can be smoothly pushed into the drawing die 4.
In an optional embodiment of the present invention, the first auxiliary wheel 1 and the second auxiliary wheel 2 push the pipe 7 to be drawn, sleeved with the sleeve 8, to enter the drawing die 4 through the gap passage, and the method includes: and the first auxiliary rotating wheel 1 rotates anticlockwise according to a first rotating speed, and the second auxiliary rotating wheel 2 rotates clockwise according to a second rotating speed, so that the pipe to be drawn sleeved with the sleeve 8 is pushed to enter the drawing die 4 through the gap channel.
In this embodiment, before the pipe 7 to be drawn, which is sleeved with the sleeve 8, is drawn, the pipe enters the drawing die 4 through the gap channel at the parallel position of the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2 of the auxiliary rotating wheel, and the pipe is pushed by the rotation of the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2. The first auxiliary rotating wheel 1 rotates anticlockwise according to a first rotating speed; the second auxiliary rotating wheel 2 rotates clockwise according to a second rotating speed, and the power generated by the relative motion of the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2 pushes the pipe 7 to be drawn to move; meanwhile, the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2 play a roll-pointing role for the pipe 7 to be drawn, which is sleeved with the sleeve 8, and are equivalent to that the pipe 7 to be drawn, which is sleeved with the sleeve 8, is subjected to rolling similar to small deformation before entering the drawing die 4 for reducing the diameter, if the cored bar can also be subjected to wall reduction at the same time, the outer diameter of the pipe 7 to be drawn, which is sleeved with the sleeve 8, at the inlet end for subsequent drawing is reduced, the drawing deformation is reduced, and further the drawing force is reduced.
Optionally, both the first rotating speed of the first auxiliary wheel 1 and the second rotating speed of the second auxiliary wheel 2 are greater than the drawing speed; and the first rotating speed and the second rotating speed are consistent in size. In the drawing process, the first rotating speed and the second rotating speed are both set to be greater than the drawing speed, which is equivalent to the fact that the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2 apply a thrust force or an extrusion force to the pipe 7 to be drawn, which is sleeved with the sleeve 8, and the thrust force or the extrusion force is in the same direction as the drawing force, so that the subsequent drawing force can be reduced, the single-pass deformation can be increased, and the drawing passes can be reduced; meanwhile, the first rotating speed and the second rotating speed are both set to be higher than the drawing speed, the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2 apply a thrust force or an extrusion force to the pipe 7 to be drawn, which is sleeved with the sleeve 8, so that the stress state of the pipe 7 to be drawn, which is partially sleeved with the sleeve 8, in the conical surface area of the drawing die 4 can be changed, the tensile stress state of the local pipe is changed into compressive stress, the deformation of the pipe to be drawn is facilitated, and particularly, the deformation of materials which are difficult to deform, such as magnesium alloy and the like, can promote twinning coordination deformation and the like in tissues; the first rotating speed is the same as the second rotating speed, so that the first auxiliary rotating wheel 1 and the second auxiliary rotating wheel 2 can be pushed at a constant speed to sleeve the pipe 7 to be drawn with the sleeve 8 to move.
In an alternative embodiment of the invention, as shown in fig. 2, the sleeve 8 is provided with at least one void 6 extending through the entire sleeve 8. In this embodiment, the sleeve 8 is provided with a gap 6 penetrating through the whole sleeve, in the drawing process, the gap 6 pushes the pipe 7 to be drawn sleeved with the sleeve 8 through the auxiliary rotating wheel, and the drawing die 4 draws the pipe 7 to be drawn sleeved with the sleeve 8 and contracts in a pressing manner, so that the sleeve 8 is basically not deformed in the drawing process, and the sleeve 8 deforms the pipe 7 to be drawn through the contraction in the gap 6, and the drawing force is not greatly influenced. Optionally, the number and the positions of the gaps 6 are not limited, in this embodiment, preferably, two gaps are provided, and the two gaps are uniformly and symmetrically distributed on the sleeve 8; the size of the gap 6 can be adjusted according to the size and the deformation of the inner diameter and the outer diameter of the pipe 7 to be drawn.
Optionally, the sleeve 8 provided with the gap 6 can be used for pipe rolling or roll die drawing of pipes; optionally, the material strength of the sleeve 8 is higher than that of the pipe 7 to be drawn.
The above is a preferred embodiment of the present invention, and the above embodiment can improve the single-pass deformation in the drawing process, reduce the number of drawing passes, reduce the number of heat treatments, improve the drawing efficiency, and reduce the drawing cost.
It should be noted that modifications and adaptations may occur to those skilled in the art without departing from the principles of the present invention and should be considered within the scope of the present invention.
Claims (10)
1. A method of drawing a pipe, comprising:
providing a pipe to be drawn;
sleeving a sleeve on the outer part of the pipe to be drawn;
one end of the pipe to be drawn, which is sleeved with the sleeve, is placed on an auxiliary rotating wheel, and the pipe to be drawn, which is sleeved with the sleeve, is pushed by the auxiliary rotating wheel to enter a drawing die for drawing.
2. The method for drawing a pipe according to claim 1, wherein placing one end of the pipe to be drawn, which is sleeved with the sleeve, on an auxiliary rotating wheel comprises:
one end of the pipe to be drawn, which is sleeved with the sleeve, is placed on a first auxiliary rotating wheel and a second auxiliary rotating wheel of the auxiliary rotating wheel;
the first auxiliary rotating wheel and the second auxiliary rotating wheel are arranged in parallel.
3. The method for drawing the pipe according to claim 2, wherein the auxiliary wheel pushes the pipe to be drawn sleeved with the sleeve into a drawing die for drawing, and comprises the following steps:
the first auxiliary rotating wheel and the second auxiliary rotating wheel of the auxiliary rotating wheel push one end of the pipe to be drawn, which is sleeved with the sleeve, to enter the drawing die for drawing.
4. The method of drawing a pipe according to claim 3, further comprising:
and one end of the pipe to be drawn, which is pushed out from the drawing die, is clamped by a clamp for drawing.
5. The method of claim 2, wherein the first auxiliary wheel and the second auxiliary wheel are provided with a hole pattern.
6. The method for drawing the pipe according to claim 2, wherein a gap passage is provided at a position where the first auxiliary rotating wheel and the second auxiliary rotating wheel are placed in parallel; the first auxiliary rotating wheel and the second auxiliary rotating wheel of the auxiliary rotating wheel push the end, sleeved with the sleeve, of the pipe to be drawn to enter the drawing die for drawing, and the drawing die comprises:
one end of the pipe to be drawn, which is sleeved with the sleeve, is placed at the gap channel, and the first auxiliary rotating wheel and the second auxiliary rotating wheel push the pipe to be drawn to enter the drawing die through the gap channel.
7. The method of claim 6, wherein the first and second auxiliary wheels push the pipe to be drawn through the gap passage into the drawing die, and the method comprises:
and the first auxiliary rotating wheel rotates anticlockwise according to a first rotating speed and the second auxiliary rotating wheel rotates clockwise according to a second rotating speed, so that the pipe to be drawn sleeved with the sleeve is pushed to enter the drawing die through the gap channel.
8. The method of drawing a pipe according to claim 7,
the first rotating speed and the second rotating speed are both greater than the drawing speed; and the first rotating speed and the second rotating speed are consistent in size.
9. The method of claim 1, wherein the sleeve is provided with at least one void extending through the sleeve.
10. The method of claim 1, wherein the material strength of the sleeve is higher than the strength of the material of the pipe to be drawn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110907424.6A CN113600630A (en) | 2021-08-09 | 2021-08-09 | Drawing method of pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110907424.6A CN113600630A (en) | 2021-08-09 | 2021-08-09 | Drawing method of pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113600630A true CN113600630A (en) | 2021-11-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110907424.6A Pending CN113600630A (en) | 2021-08-09 | 2021-08-09 | Drawing method of pipe |
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| CN (1) | CN113600630A (en) |
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| CN1448230A (en) * | 2002-03-28 | 2003-10-15 | 株式会社神户制钢所 | Apparatus for producing internally grooved tube |
| CN1593802A (en) * | 2003-09-10 | 2005-03-16 | Sms米尔股份有限公司 | Drawing apparatus and method of operating same |
| CN201385052Y (en) * | 2009-03-13 | 2010-01-20 | 湖南西湖电线电缆有限公司 | Double-valve mold core for high-voltage cable |
| CN102133583A (en) * | 2011-05-04 | 2011-07-27 | 北京科技大学 | Die/dieless integrated drawing process and device |
| CN104148438A (en) * | 2014-07-03 | 2014-11-19 | 北京科技大学 | Preparation method of metal layered composite material by multi-head sleeve drawing composition |
| CN105436232A (en) * | 2015-12-08 | 2016-03-30 | 西安诺博尔稀贵金属材料有限公司 | High-quantity hafnium rod manufacturing method |
| CN105772612A (en) * | 2016-05-13 | 2016-07-20 | 北京科技大学 | Preparation method for gold-cladding copper composite wire |
| CN206229845U (en) * | 2016-11-03 | 2017-06-09 | 宁波金田铜管有限公司 | A kind of bimodulus draw-off gear for air-conditioning coil pipe |
| CN109940097A (en) * | 2019-04-30 | 2019-06-28 | 河南时捷机械设备有限公司 | Hollow type nozzle constriction device |
-
2021
- 2021-08-09 CN CN202110907424.6A patent/CN113600630A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1448230A (en) * | 2002-03-28 | 2003-10-15 | 株式会社神户制钢所 | Apparatus for producing internally grooved tube |
| CN1593802A (en) * | 2003-09-10 | 2005-03-16 | Sms米尔股份有限公司 | Drawing apparatus and method of operating same |
| CN201385052Y (en) * | 2009-03-13 | 2010-01-20 | 湖南西湖电线电缆有限公司 | Double-valve mold core for high-voltage cable |
| CN102133583A (en) * | 2011-05-04 | 2011-07-27 | 北京科技大学 | Die/dieless integrated drawing process and device |
| CN104148438A (en) * | 2014-07-03 | 2014-11-19 | 北京科技大学 | Preparation method of metal layered composite material by multi-head sleeve drawing composition |
| CN105436232A (en) * | 2015-12-08 | 2016-03-30 | 西安诺博尔稀贵金属材料有限公司 | High-quantity hafnium rod manufacturing method |
| CN105772612A (en) * | 2016-05-13 | 2016-07-20 | 北京科技大学 | Preparation method for gold-cladding copper composite wire |
| CN206229845U (en) * | 2016-11-03 | 2017-06-09 | 宁波金田铜管有限公司 | A kind of bimodulus draw-off gear for air-conditioning coil pipe |
| CN109940097A (en) * | 2019-04-30 | 2019-06-28 | 河南时捷机械设备有限公司 | Hollow type nozzle constriction device |
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