CN109396397A - All-hydraulic drill three-decker matches the processing method of oil jacket - Google Patents
All-hydraulic drill three-decker matches the processing method of oil jacket Download PDFInfo
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- CN109396397A CN109396397A CN201811601543.3A CN201811601543A CN109396397A CN 109396397 A CN109396397 A CN 109396397A CN 201811601543 A CN201811601543 A CN 201811601543A CN 109396397 A CN109396397 A CN 109396397A
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- oil jacket
- copper alloy
- alloy layer
- matches
- decker
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- 238000003672 processing method Methods 0.000 title claims abstract description 22
- 229910000881 Cu alloy Inorganic materials 0.000 claims abstract description 69
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 67
- 239000010959 steel Substances 0.000 claims abstract description 67
- 238000000034 method Methods 0.000 claims abstract description 38
- 238000005245 sintering Methods 0.000 claims abstract description 28
- 238000005266 casting Methods 0.000 claims abstract description 15
- 238000009750 centrifugal casting Methods 0.000 claims abstract description 11
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 6
- 238000003825 pressing Methods 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 238000010792 warming Methods 0.000 claims description 6
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 5
- 239000010962 carbon steel Substances 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 230000001050 lubricating effect Effects 0.000 claims description 3
- 230000013011 mating Effects 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 238000007373 indentation Methods 0.000 claims 1
- 239000000956 alloy Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 58
- 239000000463 material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 229910000510 noble metal Inorganic materials 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/08—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/04—Centrifugal casting; Casting by using centrifugal force of shallow solid or hollow bodies, e.g. wheels or rings, in moulds rotating around their axis of symmetry
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The present invention provides a kind of processing method of the all-hydraulic drill three-decker with oil jacket, includes the following steps: a, passes through centrifugal casting technique in interior steel bushing inner wall one layer of copper alloy layer of casting；B, outer steel sleeve and interior steel bushing with copper alloy layer are sintered together securely by pressure process sintering process, formed be followed successively by from outside to inside outer steel sleeve, interior steel bushing and copper alloy layer with oil jacket ontology；C, it is finished to obtained in step b with oil jacket ontology, is opening up distributor port and balance hole with this body sidewall of oil jacket, circumferentially process cyclic annular balancing slit in copper alloy layer inner wall, three-decker is made matches oil jacket finished product.Method of the invention can prepare with relatively thin copper alloy layer with oil jacket, copper alloy layer thicknesses can be made to be no more than 1mm, Cu alloy material is substantially reduced because of deflection caused by temperature change, efficiently avoid the case where locking failure occur with oil jacket and main shaft；Meanwhile reducing production cost.
Description
Technical field
The present invention relates to mechanical design fields, and in particular to a kind of all-hydraulic drill three-decker matches the processing side of oil jacket
Method.
Background technique
It is applied to realize on full-hydraulic power head drill for hydraulic chuck of drilling machine at present and matches oil jacket using carbon with oil
The bimetallic structure of steel and copper material.Application No. is 201010574604.9 " bimetal oil distribution sleeve for full hydraulic drilling machine
In processing method " patent, die cast dense structure, high comprehensive performance are exactly first used on vertical centrifugal-casting machine
Copper alloy inner sleeve blank, then use pressure process sintering process by copper alloy inner sleeve blank and the organic soldering of carbon steel matrix, shape
Match oil jacket at bimetallic；This method is due to needing first to process the copper alloy inner sleeve of semi-finished product, then is pressed into carbon steel matrix, because
The copper alloy inner sleeve that this casting obtains cannot be too thin, because casting is too thin, processes and is easily deformed when being pressed, so using
This processing method is obtained thicker with copper alloy inner sleeve in oil jacket, and the thermal expansion system of the steel alloy of copper alloy and drill spindle
Number be it is different, the thermal expansion coefficient of copper alloy is greater than the thermal expansion coefficient of steel alloy, if copper alloy inner sleeve is thicker, work
During work, temperature is affected to the fit dimension of copper alloy inner sleeve and drill spindle, is easy to cause gap that larger change occurs
Change, so that failing with oil jacket and main shaft locking；Meanwhile it preparing thicker copper alloy inner sleeve and needing using more noble metal copper
Material, high production cost.
Therefore, in order to overcome the above patented method preparation with the problems of oil jacket, need to develop a kind of novel knot
Structure matches oil jacket and provides the processing method for matching oil jacket.
Summary of the invention
In view of this, the present invention provides a kind of new to match oil jacket processing method, can be prepared by the processing method
The three-decker on all-hydraulic drill be can be applied to oil jacket, the thickness with copper alloy layer in oil jacket is greatly reduced, effectively keep away
Exempt to fail with oil jacket and main shaft locking.
All-hydraulic drill three-decker provided by the invention matches the processing method of oil jacket, comprising the following steps:
A, by centrifugal casting technique in interior steel bushing inner wall one layer of copper alloy layer of casting；
B, outer steel sleeve and interior steel bushing with copper alloy layer are sintered together securely by pressure process sintering process, shape
At be followed successively by from outside to inside outer steel sleeve, interior steel bushing and copper alloy layer with oil jacket ontology.
Further, further comprising the steps of:
C, it is finished to obtained in step b with oil jacket ontology, is opening up distributor port peace with this body sidewall of oil jacket
Weighing apparatus hole circumferentially processes cyclic annular balancing slit in copper alloy layer inner wall, and three-decker is made matches oil jacket finished product.
Further, the thickness of the copper alloy layer is no more than 1mm, and the interior steel bushing wall thickness is 9~25mm, the outer steel sleeve
Wall thickness >=10mm.
Further, in the step a, centrifugal casting copper alloy layer the specific process is as follows: first by interior steel bushing be fixed on from
Heart casting machine pours in mold, is preheated to 800~810 DEG C, keeps 15min, it is ensured that in-furnace temperature and interior steel bushing temperature tend to one
It causes, the liquid copper alloy that temperature is 1100~1150 DEG C is poured onto mold with the speed of 2.5kg/s then, is started turning
Mold is poured, within the 10s time, revolving speed increases to n r/min, keeps 130~150s；After casting, revolving speed is reduced, until liquid
Copper alloy solidifies completely, can form thin and dense copper alloy layer in interior steel bushing inner wall.
Further, revolving speed n is calculated according to following formula and is obtained:
β × 55200/ n=(γ × r.)1/2,
In formula: n is to pour rotational speed of casting die, unit r/min；γ is copper alloy severe, unit N/m3；β is correction factor,
In: horizontal centrifugal β=1.2~1.4, vertical centrifugal β=1.0~1.5；r.For the inside radius of copper alloy layer, unit m.
Further, after casting, with acceleration for -2~-0.3rad/s2Reduce revolving speed.
Further, in the step b, pressure process sintering connection outer steel sleeve and interior steel bushing the specific process is as follows:
(1) under the premise of eliminating stress and removing removing oxide layer, the interior steel bushing with copper alloy layer is pressed into outer steel sleeve, so
It is placed on the pressurization cushion block in vacuum sintering furnace afterwards, is inserted into the pressurization core of pressing mechanism in interior steel bushing, pressurization core and copper close
Design has small cooperation taper, taper 1:10 between the mating surface of layer gold, then by vacuum-sintering stove evacuation, controls vacuum
Degree is 2~3 × 10-3Pa；
(2) vacuum sintering furnace is warming up to 800 DEG C, keeps the temperature 15min, it is ensured that object temperature tends to one in in-furnace temperature and furnace
After cause, pressing mechanism starts pressurization and gives pressurization core, and the pressure of application is 8MPa, pressurizes after 35min, vacuum sintering furnace is warming up to
900 DEG C, and the pressure applied to pressurization core is risen into 11MPa, after pressure sintering 60min, vacuum sintering furnace is closed, is gradually decreased
The pressure of pressing mechanism is to normal pressure state, and after 30min, workpiece can come out of the stove.
Further, two groups of through-holes are opened up along axial direction with this body sidewall of oil jacket described, every group is two, and each through-hole is along with oil
This body sidewall is covered radially to penetrate through, it is described that the annular groove being connected to corresponding group of through-hole is opened up along axial direction with oil jacket inner body wall；Often
For two through-holes of group using symmetrical as center line with oil jacket body axis, one of them is for the distributor port with oil, separately
Outer one is the balance hole for balance；It is described ring-type balancing slit be machined with it is multiple, along with oil jacket ontology axially be distributed.
Further, the copper alloy layer is the Allen's metal material layer with lubricating and wear-resisting；Interior steel bushing and outer steel sleeve are carbon
Plain steel material.
The present invention also provides using full liquid made from processing method of the all-hydraulic drill three-decker with oil jacket
Drilol press three-decker matches oil jacket.
Beneficial effects of the present invention: a kind of processing side of the all-hydraulic drill three-decker with oil jacket is provided in the present invention
Method can be prepared by this method and match oil jacket with more thin and dense copper alloy layer, make obtained with copper alloy in oil jacket
Thickness degree is no more than 1mm, substantially reduces Cu alloy material because of deflection caused by temperature change, to efficiently avoid matching
There is the case where locking failure in oil jacket and main shaft；Meanwhile the copper alloy layer of preparation is relatively thin, reduces the use of noble metal copper material,
Reduce production cost.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawings and examples:
Fig. 1 is the schematic diagram of centrifugal casting copper alloy layer；
Fig. 2 is the schematic diagram of pressure process sintering outer steel sleeve and the interior steel bushing with copper alloy layer；
Fig. 3 is the structural schematic diagram that all-hydraulic drill three-decker matches oil jacket；
Fig. 4 is the enlarged drawing of the portion A1 ring-type balancing slit in Fig. 3；
Fig. 5 is the main view that all-hydraulic drill three-decker matches oil jacket；
Fig. 6 is the top view that all-hydraulic drill three-decker matches oil jacket；
In figure: 1, liquid copper alloy, 2, pour mold, 3, interior steel bushing, 4, copper alloy layer, 5, outer steel sleeve, 6, vacuum sintering furnace,
7, pressing mechanism, 8, pressurization core, 9, pressurization cushion block, 10, through-hole, 11, cyclic annular balancing slit, 12, annular groove.
Specific embodiment
Embodiment one
All-hydraulic drill three-decker provided in this embodiment matches the processing method of oil jacket, comprising the following steps:
A, by centrifugal casting technique in interior steel bushing inner wall one layer of copper alloy layer of casting, the specific process is as follows:
Interior steel bushing is first fixed on the pouring in mold of centrifugal casting machine, is preheated to 800~810 DEG C, keeps 15min, it is ensured that
In-furnace temperature reaches unanimity with interior steel bushing temperature, is then 1100~1150 DEG C of liquid copper alloy with 2.5kg/s's by temperature
Speed is poured onto mold, is started turning and is poured mold, and within the 10s time, revolving speed increases to n r/min, keeps 130~150s；
After casting, with acceleration for -2~-0.3rad/s2Revolving speed is reduced, until liquid copper alloy solidifies completely, it can be in interior steel
Set inner wall forms thin and dense copper alloy layer；Here revolving speed n is calculated according to following formula and is obtained:
β × 55200/ n=(γ × r.)1/2,
In formula: n is to pour rotational speed of casting die, unit r/min；γ is copper alloy severe, unit N/m3；β is correction factor,
In: horizontal centrifugal β=1.2~1.4, vertical centrifugal β=1.0~1.5；r.For the inside radius of copper alloy layer, unit m is (specific etc.
The thickness of interior steel bushing and copper alloy layer is subtracted in the radius of casting mold cavity)；Copper alloy is cast in interior using centrifugal casting technique
Steel bushing inner wall can prevent stress deformation and hydraulic oil from revealing, avoid locking rotation axis；
B, outer steel sleeve and interior steel bushing with copper alloy layer are sintered together securely by pressure process sintering process, shape
At be followed successively by from outside to inside outer steel sleeve, interior steel bushing and copper alloy layer with oil jacket ontology, the specific process is as follows:
(1) under the premise of eliminating stress and removing removing oxide layer, the interior steel bushing with copper alloy layer is pressed into outer steel sleeve, so
It is placed on the pressurization cushion block in vacuum sintering furnace afterwards, is inserted into the pressurization core of pressing mechanism in interior steel bushing, pressurization core and copper close
Design has small cooperation taper, taper 1:10 between the mating surface of layer gold, then by vacuum-sintering stove evacuation, controls vacuum
Degree is 2~3 × 10-3Pa；
(2) vacuum sintering furnace is warming up to 800 DEG C, keeps the temperature 15min, it is ensured that object temperature tends to one in in-furnace temperature and furnace
After cause, pressing mechanism starts pressurization and gives pressurization core, and the pressure of application is 8MPa, pressurizes after 35min, vacuum sintering furnace is warming up to
900 DEG C, and the pressure applied to pressurization core is risen into 11MPa, after pressure sintering 60min, vacuum sintering furnace is closed, is gradually decreased
The pressure of pressing mechanism is to normal pressure state, and after 30min, workpiece can come out of the stove, and workpiece of coming out of the stove is three-decker with oil jacket sheet
Body；Alloy diffusion layer is formed between interior steel bushing, outer steel sleeve by pressure process sintering process, inside and outside steel bushing is burnt securely
Knot together, prevents from loosening；
C, it is finished to obtained in step b with oil jacket ontology, is opening up distributor port peace with this body sidewall of oil jacket
Weighing apparatus hole circumferentially processes cyclic annular balancing slit in copper alloy layer inner wall, and three-decker is made matches oil jacket finished product.
In the present embodiment, the thickness of the copper alloy layer is no more than 1mm, and the interior steel bushing wall thickness is 9~25mm, described outer
Steel bushing wall thickness >=10mm；Copper alloy layer is relatively thin, substantially reduces Cu alloy material because of deflection caused by temperature change, to have
It avoids to effect and the case where locking failure occurs with oil jacket and main shaft；Meanwhile the copper alloy layer of preparation is relatively thin, reduces noble metal
The use of copper material, reduces production cost；Otherwise it is bad to pour effect no more than 25mm for interior steel bushing wall thickness.
In the present embodiment, two groups of through-holes are opened up along axial direction with this body sidewall of oil jacket described, every group is two, each through-hole edge
With oil jacket, this body sidewall is radially penetrated through, described that the ring being connected to corresponding group of through-hole is opened up along axial direction with oil jacket inner body wall
Slot；For every group of two through-holes using symmetrical as center line with oil jacket body axis, one of them is for matching oil with oil
Hole, another is the balance hole for balance；When with oil, balance hole is blocked.The position of two groups of through-holes is according to specific drilling machine
Depending on structure, and the axis of two groups of through-holes is non-coplanar.It is described ring-type balancing slit be machined with it is multiple, along with oil jacket ontology axially point
Cloth, the ring-type balancing slit are arranged with two annular groove intervals being equipped with oil jacket inner body wall, form three groups of ring-type balancing slits
Group.This structure can form the floating type oil film of perforation under working condition with oil jacket, realize and float at work with oil jacket
Dynamic head main spindle state.It is by prior art processing with distributor port, balance hole, annular groove and the cyclic annular balancing slit on oil jacket
Can, details are not described herein.
In the present embodiment, the copper alloy layer is the Allen's metal material layer with lubricating and wear-resisting；Interior steel bushing and outer steel sleeve
For carbon steel；Ensure that there is enough stiffnesses with oil jacket.
The present embodiment matches the processing method of oil jacket using above-mentioned all-hydraulic drill three-decker, selects vertical centrifugal machine,
Adjustment revolving speed n is 920r/min, prepared copper alloy layer with a thickness of 0.95mm, interior steel bushing wall thickness is 11mm, outer steel sleeve wall
The all-hydraulic drill three-decker that thickness is 25.5mm matches oil jacket.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the scope of the claims of invention.
Claims (10)
1. a kind of all-hydraulic drill three-decker matches the processing method of oil jacket, it is characterised in that: the following steps are included:
A, by centrifugal casting technique in interior steel bushing inner wall one layer of copper alloy layer of casting；
B, outer steel sleeve and interior steel bushing with copper alloy layer are sintered together securely by pressure process sintering process, formed by
Be followed successively by outer steel sleeve, interior steel bushing and copper alloy layer in outside matches oil jacket ontology.
2. all-hydraulic drill three-decker according to claim 1 matches the processing method of oil jacket, it is characterised in that: further include
Following steps:
C, it is finished to obtained in step b with oil jacket ontology, is opening up distributor port and balance hole with this body sidewall of oil jacket,
Cyclic annular balancing slit is circumferentially processed in copper alloy layer inner wall, three-decker is made matches oil jacket finished product.
3. all-hydraulic drill three-decker according to claim 1 matches the processing method of oil jacket, it is characterised in that: the copper
The thickness of alloy-layer is no more than 1mm, and the interior steel bushing wall thickness is 9~25mm, the outer steel sleeve wall thickness >=10mm.
4. all-hydraulic drill three-decker according to claim 1 matches the processing method of oil jacket, it is characterised in that: the step
In rapid a, centrifugal casting copper alloy layer the specific process is as follows: interior steel bushing is first fixed on the pouring in mold of centrifugal casting machine, in advance
Heat keeps 15min to 800~810 DEG C, it is ensured that in-furnace temperature reaches unanimity with interior steel bushing temperature, then by temperature for 1100~
1150 DEG C of liquid copper alloy is poured onto mold with the speed of 2.5kg/s, is started turning and is poured mold, within the 10s time, is turned
Speed increases to n r/min, keeps 130~150s；After casting, revolving speed is reduced, until liquid copper alloy solidifies completely, Ji Ke
Interior steel bushing inner wall forms thin and dense copper alloy layer.
5. all-hydraulic drill three-decker according to claim 4 matches the processing method of oil jacket, it is characterised in that: revolving speed n
It calculates and obtains according to following formula:
β × 55200/ n=(γ × r.)1/2,
In formula: n is to pour rotational speed of casting die, unit r/min；γ is copper alloy severe, unit N/m3；β is correction factor, in which: horizontal
It is centrifuged β=1.2~1.4, vertical centrifugal β=1.0~1.5；r.For the inside radius of copper alloy layer, unit m.
6. all-hydraulic drill three-decker according to claim 4 matches the processing method of oil jacket, it is characterised in that: cast
Bi Hou, with acceleration for -2~-0.3rad/s2Reduce revolving speed.
7. all-hydraulic drill three-decker according to claim 4 matches the processing method of oil jacket, it is characterised in that: the step
In rapid b, pressure process sintering connection outer steel sleeve and interior steel bushing the specific process is as follows:
(1) it under the premise of eliminating stress and removing removing oxide layer, by the interior steel bushing indentation outer steel sleeve with copper alloy layer, then puts
It is placed on the pressurization cushion block in vacuum sintering furnace, is inserted into the pressurization core of pressing mechanism in interior steel bushing, pressurize core and copper alloy layer
Mating surface between design have a small cooperation taper, taper 1:10, then by vacuum-sintering stove evacuation, controlling vacuum degree is
2~3 × 10-3Pa；
(2) vacuum sintering furnace is warming up to 800 DEG C, keeps the temperature 15min, it is ensured that in-furnace temperature reaches unanimity with object temperature in furnace
Afterwards, pressing mechanism starts pressurization to the core that pressurizes, and the pressure of application is 8MPa, pressurizes after 35min, vacuum sintering furnace is warming up to
900 DEG C, and the pressure applied to pressurization core is risen into 11MPa, after pressure sintering 60min, vacuum sintering furnace is closed, is gradually decreased
The pressure of pressing mechanism is to normal pressure state, and after 30min, workpiece can come out of the stove.
8. all-hydraulic drill three-decker according to claim 2 matches the processing method of oil jacket, it is characterised in that: described
Two groups of through-holes are opened up along axial direction with this body sidewall of oil jacket, every group is two, and each through-hole is radially penetrated through along with this body sidewall of oil jacket, institute
It states and opens up the annular groove being connected to corresponding group of through-hole along axial direction with oil jacket inner body wall；Every group of two through-holes are to match oil jacket
Body axis is that center line is symmetrical, one of them is for the distributor port with oil, another is the balance for balance
Hole；It is described ring-type balancing slit be machined with it is multiple, along with oil jacket ontology axially be distributed.
9. all-hydraulic drill three-decker according to claim 1 matches the processing method of oil jacket, it is characterised in that: the copper
Alloy-layer is the Allen's metal material layer with lubricating and wear-resisting；Interior steel bushing and outer steel sleeve are carbon steel.
10. matching the processing method of oil jacket using all-hydraulic drill three-decker described in any claim in claim 1-9
All-hydraulic drill three-decker obtained matches oil jacket.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811601543.3A CN109396397A (en) | 2018-12-26 | 2018-12-26 | All-hydraulic drill three-decker matches the processing method of oil jacket |
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| CN201811601543.3A CN109396397A (en) | 2018-12-26 | 2018-12-26 | All-hydraulic drill three-decker matches the processing method of oil jacket |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113426976A (en) * | 2021-04-10 | 2021-09-24 | 桂林理工大学 | Crack control method for bimetal composite pipe |
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|---|---|---|---|---|
| CN113426976A (en) * | 2021-04-10 | 2021-09-24 | 桂林理工大学 | Crack control method for bimetal composite pipe |
| CN113426976B (en) * | 2021-04-10 | 2022-08-09 | 桂林理工大学 | Crack control method for bimetal composite pipe |
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