CN102528264B - Bimetal vacuum diffusion welding method of hydraulic pump/motor cylinder body - Google Patents
Bimetal vacuum diffusion welding method of hydraulic pump/motor cylinder body Download PDFInfo
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- CN102528264B CN102528264B CN 201110399612 CN201110399612A CN102528264B CN 102528264 B CN102528264 B CN 102528264B CN 201110399612 CN201110399612 CN 201110399612 CN 201110399612 A CN201110399612 A CN 201110399612A CN 102528264 B CN102528264 B CN 102528264B
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- vacuum hotpressing
- plunger hole
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- 238000003466 welding Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000009792 diffusion process Methods 0.000 title claims abstract description 23
- 238000007731 hot pressing Methods 0.000 claims abstract description 93
- 229910000881 Cu alloy Inorganic materials 0.000 claims abstract description 69
- 238000009413 insulation Methods 0.000 claims abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 239000010425 asbestos Substances 0.000 claims abstract description 8
- 239000004744 fabric Substances 0.000 claims abstract description 8
- 229910052895 riebeckite Inorganic materials 0.000 claims abstract description 8
- 238000005245 sintering Methods 0.000 claims abstract description 7
- 239000011159 matrix material Substances 0.000 claims description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 239000007770 graphite material Substances 0.000 claims description 8
- 238000004886 process control Methods 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 abstract 2
- 229910000746 Structural steel Inorganic materials 0.000 abstract 1
- 238000003825 pressing Methods 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 43
- 239000011229 interlayer Substances 0.000 description 5
- 238000000429 assembly Methods 0.000 description 4
- 230000000712 assembly Effects 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 210000004907 gland Anatomy 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 238000005088 metallography Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000010183 spectrum analysis Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
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Abstract
The invention relates to a bimetal vacuum diffusion welding method of a hydraulic pump/motor cylinder body. The bimetal vacuum diffusion welding method comprises the following implementation steps of: (1) manufacturing all parts and assembling: pressing a copper alloy sleeve into each plunger hole, inserting a plunger hole expansion core into a hole of each copper alloy sleeve, placing a spherical surface copper alloy plate on the hemispherical surface at the upper end of a basal body, placing plunger hole heat insulation layers between the plunger hole expansion cores and the copper alloy sleeves, and placing hemispherical surface heat insulation layers between hemispherical surface pressure heads and the spherical surface copper alloy plate; (2) charging into a furnace: respectively placing the hemispherical surface pressure head on the upper surface of each cylinder body component, and laying asbestos cloth between layers of each cylinder body component; (3) sintering: controlling the vacuum degree, the heating-up process and the pressurizing process in a vacuum hot-pressing furnace; and (4) firstly uniformly cooling down, and then naturally cooling to the normal temperature. According to the bimetal vacuum diffusion welding method disclosed by the invention, interatomic mutual diffusion bonding of a copper alloy and carbon structural steel of the basal body can be realized, the structure of the copper alloy is more compact, the anti-friction effect is further improved and the working life is significantly prolonged.
Description
Technical field
The present invention relates to plant equipment manufacturing technology field, relate to the method that the vacuum diffusion welding of a kind of hydraulic pump/motor cylinder body bimetallic connects.
Background technology
In order to improve the service life of hydraulic pump/motor cylinder body, the plunger hole of cylinder body and hemisphere face generally use copper alloy as friction pair material, and namely inner surface and the hemispherical outer surface at the cylinder body plunger hole adheres to the layer of copper alloy as wearing layer.How this wearing layer is combined with the matrix (carbon junction steel) of cylinder body, various ways are arranged at present, but general way has two kinds: the one, and the integrated poured copper alloy of plunger hole and hemisphere face; The 2nd, plunger hole adopts interference fit to press-fit copper alloy cover, hemisphere face cast copper alloy.All there is defective in these two kinds of processes, and are integrated poured owing to gravity segregation occurs easily, cause material chemical composition inhomogeneous, reduced the wearability of material; The casting flaw that occurs when in addition pouring into a mould usually makes and scraps when cylinder body is worked into finishing operation.The method of plunger hole gland because interference fit is physical bond, cylinder body copper sheathing when work often occurs and deviates from phenomenon.
Summary of the invention
The purpose of this invention is to provide the method that the vacuum diffusion welding of a kind of hydraulic pump/motor cylinder body bimetallic connects, solved in the prior art bimetallic hydraulic pump/motor cylinder body be not wear-resisting in conjunction with existing gravity segregation, matrix embrittlement, micro-flaw and plunger hole copper sheathing to deviate from etc. to cause, undercapacity and service life short problem.
The technical solution adopted in the present invention is, the method that the vacuum diffusion welding of a kind of hydraulic pump/motor cylinder body bimetallic connects is implemented according to following steps:
Step 1, earlier make each parts respectively according to the drawing specification, comprise that the matrix of workpiece cylinder body, the copper alloy that will weld overlap and the hemisphere face copper alloy plate, and the plunger hole that is used in the welding process rise core and hemisphere face pressure head, described matrix is carbon junction steel;
Assemble again, namely in each plunger hole of matrix, be pressed into the copper alloy cover of a correspondence, the taper of copper alloy cover is down uncovered, insert the plunger hole core that rises in each copper alloy trepanning from bottom to top, the hemisphere face copper alloy plate is placed on the hemisphere face of matrix upper end, simultaneously in assembling process, rise at plunger hole and to place the plunger hole thermal insulation layer of graphite material between core and the copper alloy cover, between hemisphere face pressure head and hemisphere face copper alloy plate, place the hemisphere face thermal insulation layer of graphite material, the housing assembly that obtains assembling;
Step 3, sintering: the vacuum of controlling all the time in the vacuum hotpressing stove is 1 * 10
1-1 * 10
-2Pa, and carry out intensification, pressure process control in the vacuum hotpressing stove according to following three phases:
3.1) making that in 90-120 minute temperature evenly rises to 600 ℃ from room temperature in the vacuum hotpressing stove, the downward pressure of push-down head reaches 5-8MPa in the vacuum hotpressing stove simultaneously, is incubated 10-15 minute;
3.2) in 60-80 minute, make in the vacuum hotpressing stove temperature evenly rise to 750 ℃ from 600 ℃, the downward pressure of push-down head reaches 8-15MPa in the vacuum hotpressing stove simultaneously, is incubated 10-15 minute then;
3.3) make that in 60-90 minute temperature evenly rises to 850-870 ℃ from 750 ℃ in the vacuum hotpressing stove, the downward pressure of push-down head reaches 15-20MPa in the vacuum hotpressing stove simultaneously, be incubated 60-65 minute then, in the insulating process, the downward pressure of push-down head reaches 20-30Mpa in the vacuum hotpressing stove;
The invention has the beneficial effects as follows, adopt the process of vacuum diffusion welding with matrix (carbon junction steel) integral solder of plunger hole and hemispherical copper alloy and cylinder body, avoided the gravity segregation of pouring technology appearance and the phenomenon of press-offing that gland technology occurs; In addition, the technical process of vacuum diffusion welding is hot pressing welding under vacuum state, and cylinder body plunger hole and hemisphere face copper alloy are had the secondary heat treatment effect, can eliminate casting stress and the microscopic defect of copper alloy, it is finer and close, even to make copper alloy organize, and wearability is further enhanced.
Description of drawings
Fig. 1 is the mounting structure schematic diagram of the vacuum hotpressing stove that relies on of the inventive method;
Fig. 2 is the housing assembly assembly structure schematic diagram in the inventive method;
Fig. 3 adopts bimetallic that the inventive method obtains in conjunction with the energy spectrum analysis figure that locates;
Fig. 4 is that the cylinder body bimetallic of the inventive method preparation is in conjunction with face metallography microscope photo;
Fig. 5 has the cylinder body bimetallic of method preparation now in conjunction with face metallography microscope photo.
Among the figure, 1. hydraulic cylinder; 2. furnace body support; 3. body of heater; 4. push-down head; 5. housing assembly; 6. vacuum pumping opening; 7. electrode interface; 8. lower support seat; 9. support plate, 21. hemisphere face pressure heads; 22. hemisphere face thermal insulation layer; 23. sphere copper alloy plate; 24. plunger hole copper alloy cover, 25. plunger hole thermal insulation layers; The core 26. plunger hole rises; 27. matrix.
The specific embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the method that hydraulic pump/motor cylinder body bimetallic of the present invention vacuum diffusion welding connects, rely on a kind of vacuum hotpressing stove Welding Structure, its structure is, the body of heater 3 of vacuum hotpressing stove is installed by support plate 9 in furnace body support 2, the upper end of furnace body support 2 is provided with hydraulic cylinder 1, has vacuum pumping hole 6 at the body of heater 3 of vacuum hotpressing stove, and vacuum pumping hole 6 is connected with vacuum unit outside the furnace body support 2; The electrode interface 7 of the heater in the body of heater 3 is connected with the electric-control system of vacuum hotpressing stove; Body of heater 3 inside are provided with lower support seat 8 and push-down head 4, push-down head 4 is arranged on the top of lower support seat 8, lower support seat 8 passes body of heater 3 downwards and is fixedly mounted on the base plate of furnace body support 2, push-down head 4 upwards passes body of heater 3 backs by connecting rod and is connected with hydraulic cylinder 1, is used for placing the housing assembly 5 as processing object between lower support seat 8 and the push-down head 4.
The body of heater 3 of vacuum hotpressing stove is connected with the vacuum unit by vacuum pumping hole 6, is used for realizing the vacuum state (1 * 10 of vacuum hotpressing stove
1-1 * 10
-2Pa); Push-down head 4 is connected with the hydraulic cylinder 1 that the vacuum hotpressing stove top arranges by connecting rod, push-down head 4 applies vertical load by the mode to the top to workpiece with lower support seat 8, realize exerting pressure in the cylinder body vacuum welding process, pressure limit is 5MPa-30Mpa, electrode interface 7 is connected the unified Collaborative Control that realizes vacuum hotpressing stove internal temperature, pressure, displacement and vacuum with external electric-control system.
The method that hydraulic pump/motor cylinder body bimetallic of the present invention vacuum diffusion welding connects, specifically implement according to following steps:
Step 1, elder generation make each parts respectively according to the drawing specification, comprise the matrix 27 of workpiece cylinder body, copper alloy cover 24 and the hemisphere face copper alloy plate 23 that will weld, and the plunger hole that is used in the welding process rise core 26 and hemisphere face pressure head 21, it is that cylindrical inner diameter is conical structure that copper alloy cover 24 is processed into external diameter, plunger hole rises by the interior hole shape of core 26 cylindrical shapes and copper alloy cover 24 according to the matched in clearance controlling dimension, and the spheric curvature of hemisphere face pressure head 21 is consistent with hemisphere face copper alloy plate 23;
Assemble according to structure shown in Figure 2 again, namely in each plunger hole of matrix 27, be pressed into the copper alloy cover 24 of a correspondence, the taper of copper alloy cover 24 is down uncovered, each copper alloy overlaps and inserts the plunger hole core 26 that rises in 24 holes from bottom to top, hemisphere face copper alloy plate 23 is placed on the hemisphere face of matrix 27 upper ends, simultaneously in assembling process, in order to prevent that cylinder body and hot-working frock from producing unnecessary welding adhesion, must rise at plunger hole and place the plunger hole thermal insulation layer 25 of graphite material between core 26 and the copper alloy cover 24, between hemisphere face pressure head 21 and hemisphere face copper alloy plate 23, place the hemisphere face thermal insulation layer 22 of graphite material, the housing assembly 5 that obtains assembling.
Step 3, sintering: utilize control system that corresponding vacuum welding parameter is set, the vacuum of controlling all the time in the vacuum hotpressing stove is 1 * 10
1-1 * 10
-2Pa, and carry out intensification, pressure process control in the vacuum hotpressing stove according to following three phases:
3.1) making that in 90-120 minute temperature evenly rises to 600 ℃ from room temperature in the vacuum hotpressing stove, the downward pressure of push-down head 4 reaches 5-8MPa in the vacuum hotpressing stove simultaneously, is incubated 10-15 minute;
3.2) in 60-80 minute, make in the vacuum hotpressing stove temperature evenly rise to 750 ℃ from 600 ℃, the downward pressure of push-down head 4 reaches 8-15MPa in the vacuum hotpressing stove simultaneously, is incubated 10-15 minute then;
3.3) make that in 60-90 minute temperature evenly rises to 850-870 ℃ from 750 ℃ in the vacuum hotpressing stove, the downward pressure of push-down head 4 reaches 15-20MPa in the vacuum hotpressing stove simultaneously, be incubated 60-65 minute then, in the insulating process, the downward pressure of push-down head 4 reaches 20-30Mpa in the vacuum hotpressing stove;
Embodiment 1
Step 1, elder generation make each parts respectively according to the drawing specification, comprise the matrix 27 of workpiece cylinder body, copper alloy cover 24 and the hemisphere face copper alloy plate 23 that will weld, and the plunger hole that is used in the welding process rise core 26 and hemisphere face pressure head 21, it is that cylindrical inner diameter is conical structure that copper alloy cover 24 is processed into external diameter, plunger hole rises by the interior hole shape of core 26 cylindrical shapes and copper alloy cover 24 according to the matched in clearance controlling dimension, and the spheric curvature of hemisphere face pressure head 21 is consistent with hemisphere face copper alloy plate 23;
Assemble according to structure shown in Figure 2 again, namely in each plunger hole of matrix 27, be pressed into the copper alloy cover 24 of a correspondence, the taper of copper alloy cover 24 is down uncovered, each copper alloy overlaps and inserts the plunger hole core 26 that rises in 24 holes from bottom to top, hemisphere face copper alloy plate 23 is placed on the hemisphere face of matrix 27 upper ends, simultaneously in assembling process, in order to prevent that cylinder body and hot-working frock from producing unnecessary welding adhesion, must rise at plunger hole and place the plunger hole thermal insulation layer 25 of graphite material between core 26 and the copper alloy cover 24, between hemisphere face pressure head 21 and hemisphere face copper alloy plate 23, place the hemisphere face thermal insulation layer 22 of graphite material, the housing assembly 5 that obtains assembling.
Step 3, sintering: utilize control system that corresponding vacuum welding parameter is set, the vacuum of controlling all the time in the vacuum hotpressing stove is 1 * 10
1Pa, and carry out intensification, pressure process control in the vacuum hotpressing stove according to following three phases:
3.1) making that in 90 minutes temperature evenly rises to 600 ℃ from room temperature in the vacuum hotpressing stove, the downward pressure of push-down head 4 reaches 5MPa in the vacuum hotpressing stove simultaneously, is incubated 10 minutes;
3.2) in 60 minutes, make in the vacuum hotpressing stove temperature evenly rise to 750 ℃ from 600 ℃, the downward pressure of push-down head 4 reaches 8MPa in the vacuum hotpressing stove simultaneously, is incubated 10 minutes then;
3.3) make that in 60 minutes temperature evenly rises to 850 ℃ from 750 ℃ in the vacuum hotpressing stove, the downward pressure of push-down head 4 reaches 15MPa in the vacuum hotpressing stove simultaneously, be incubated 60 minutes then, in the insulating process, the downward pressure of push-down head 4 reaches 20Mpa in the vacuum hotpressing stove;
Step 1, implement according to the step of embodiment 1;
Step 3, the vacuum of controlling in the vacuum hotpressing stove all the time are 1 * 10
-2Pa, and carry out intensification, pressure process control in the vacuum hotpressing stove according to following three phases:
3.1) making that in 120 minutes temperature evenly rises to 600 ℃ from room temperature in the vacuum hotpressing stove, the downward pressure of push-down head 4 reaches 8MPa in the vacuum hotpressing stove simultaneously, is incubated 15 minutes;
3.2) in 80 minutes, make in the vacuum hotpressing stove temperature evenly rise to 750 ℃ from 600 ℃, the downward pressure of push-down head 4 reaches 15MPa in the vacuum hotpressing stove simultaneously, is incubated 15 minutes then;
3.3) make that in 90 minutes temperature evenly rises to 870 ℃ from 750 ℃ in the vacuum hotpressing stove, the downward pressure of push-down head 4 reaches 20MPa in the vacuum hotpressing stove simultaneously, be incubated 65 minutes then, in the insulating process, the downward pressure of push-down head 4 reaches 30Mpa in the vacuum hotpressing stove;
Embodiment 3
Step 1, implement according to the step of embodiment 1;
Step 3, sintering: utilize control system that corresponding vacuum welding parameter is set, the vacuum of controlling all the time in the vacuum hotpressing stove is 1 * 10
-1Pa, and carry out intensification, pressure process control in the vacuum hotpressing stove according to following three phases:
3.1) making that in 100 minutes temperature evenly rises to 600 ℃ from room temperature in the vacuum hotpressing stove, the downward pressure of push-down head 4 reaches 6MPa in the vacuum hotpressing stove simultaneously, is incubated 12 minutes;
3.2) in 70 minutes, make in the vacuum hotpressing stove temperature evenly rise to 750 ℃ from 600 ℃, the downward pressure of push-down head 4 reaches 12MPa in the vacuum hotpressing stove simultaneously, is incubated 12 minutes then;
3.3) make that in 80 minutes temperature evenly rises to 860 ℃ from 750 ℃ in the vacuum hotpressing stove, the downward pressure of push-down head 4 reaches 18MPa in the vacuum hotpressing stove simultaneously, be incubated 60 minutes then, in the insulating process, the downward pressure of push-down head 4 reaches 25Mpa in the vacuum hotpressing stove;
Step 1, implement according to the step of embodiment 1;
Step 3, sintering: the vacuum of controlling all the time in the vacuum hotpressing stove is 1.5 * 10
-2Pa, and carry out intensification, pressure process control in the vacuum hotpressing stove according to following three phases:
3.1) making that in 110 minutes temperature evenly rises to 600 ℃ from room temperature in the vacuum hotpressing stove, the downward pressure of push-down head 4 reaches 7MPa in the vacuum hotpressing stove simultaneously, is incubated 10 minutes;
3.2) in 70 minutes, make in the vacuum hotpressing stove temperature evenly rise to 750 ℃ from 600 ℃, the downward pressure of push-down head 4 reaches 10MPa in the vacuum hotpressing stove simultaneously, is incubated 15 minutes then;
3.3) make that in 70 minutes temperature evenly rises to 860 ℃ from 750 ℃ in the vacuum hotpressing stove, the downward pressure of push-down head 4 reaches 16MPa in the vacuum hotpressing stove simultaneously, be incubated 60 minutes then, in the insulating process, the downward pressure of push-down head 4 reaches 30Mpa in the vacuum hotpressing stove;
From the bimetallic of Fig. 3 in conjunction with the energy spectrum analysis figure, can be quantitative find out in the cylinder body that the inventive method prepares that each essential element of copper alloy is diffused into the degree of depth and iron atom in the steel and is diffused into the degree of depth in the copper alloy.In Fig. 3, Fe curve and Cu curved intersection place are the bimetallic interface, and abscissa represents diffusion depth among the figure, and ordinate represents the concentration of each atom diffusion.As seen from Figure 3, the degree of depth that Cu, Sn, Ni are diffused in the steel is about 22 μ m, and the degree of depth that Fe is diffused in the copper alloy is about 20 μ m.In between the diffusion region of steel, because the infiltration of each element of copper alloy, carbon junction steel transforms for steel alloy, so bimetallic is in conjunction with the intensity of the face intensity greater than cylinder body matrix material carbon junction steel.
From the bimetallic of Fig. 4 in conjunction with the face gold as the photo as can be seen, on the faying face of copper alloy and carbon junction steel, two kinds of metals fully metallurgy changed; Comparison diagram 5 existing copper alloy gold as in the photo as can be seen, through the copper alloy of vacuum diffusion welding, Pb distributes more even.
Utilize the prepared hydraulic pump of method of the present invention or hydraulic motor cylinders, owing in cylinder body hemisphere face and plunger hole, be respectively charged into hemisphere face copper alloy plate and copper alloy cover, under vacuum state, carry out the HTHP Diffusion Welding, make the matrix (carbon junction steel) of cylinder body and copper alloy wearing layer reach metallurgical binding.So, the bimetallic cylinder body that utilizes vacuum diffusion welding to make, because bimetallic is in conjunction with the intensity height, wearing layer dense structure, chemical composition are evenly distributed, and make the wearability of cylinder body be greatly improved.Through various tests and actual the use, prove that the bimetallic cylinder body that vacuum diffusion welding connects can satisfy hydraulic pump/motor fully in high pressure, high-revolving condition of work, has boundless application value.
Claims (3)
1. the method that connects of hydraulic pump/motor cylinder body bimetallic vacuum diffusion welding is characterized in that, implements according to following steps:
Step 1, elder generation make each parts respectively according to the drawing specification, comprise the matrix (27) of workpiece cylinder body, the copper alloy cover (24) that will weld and hemisphere face copper alloy plate (23), and the plunger hole that is used in the welding process rise core (26) and hemisphere face pressure head (21), described matrix (27) is carbon junction steel;
Assemble again, namely in each plunger hole of matrix (27), be pressed into the copper alloy cover (24) of a correspondence, the taper of copper alloy cover (24) is down uncovered, insert the plunger hole core (26) that rises in each copper alloy cover (24) hole from bottom to top, hemisphere face copper alloy plate (23) is placed on the hemisphere face of matrix (27) upper end, simultaneously in assembling process, rise between core (26) and the copper alloy cover (24) at plunger hole and to place the plunger hole thermal insulation layer (25) of graphite material, between hemisphere face pressure head (21) and hemisphere face copper alloy plate (23), place the hemisphere face thermal insulation layer (22) of graphite material, the housing assembly that obtains assembling (5);
Step 2, shove charge: the housing assembly (5) that step 1 assembles is put into the welded body of heater of vacuum hotpressing stove (3), with the plunger hole of each housing assembly (5) down, hemisphere face is placed on the lower support seat (8) in the vacuum hotpressing stove up, the upper surface of each housing assembly (5) is placed a hemisphere face pressure head (21), area size according to different specification size and lower support seat (8), put 3-7 housing assembly (5) for every layer, put the 3-4 layer altogether, the thick asbestos cloth of place mat 2-2.5mm between layer and the layer;
Step 3, sintering: the vacuum of controlling all the time in the vacuum hotpressing stove is 1 * 10
1-1 * 10
-2Pa, and carry out intensification, pressure process control in the vacuum hotpressing stove according to following three phases:
3.1) making that in 90-120 minute temperature evenly rises to 600 ℃ from room temperature in the vacuum hotpressing stove, the downward pressure of push-down head (4) reaches 5-8MPa in the vacuum hotpressing stove simultaneously, is incubated 10-15 minute;
3.2) in 60-80 minute, make in the vacuum hotpressing stove temperature evenly rise to 750 ℃ from 600 ℃, the downward pressure of push-down head (4) reaches 8-15MPa in the vacuum hotpressing stove simultaneously, is incubated 10-15 minute then;
3.3) make that in 60-90 minute temperature evenly rises to 850-870 ℃ from 750 ℃ in the vacuum hotpressing stove, the downward pressure of push-down head (4) reaches 15-20MPa in the vacuum hotpressing stove simultaneously, be incubated 60-65 minute then, in the insulating process, the downward pressure of push-down head (4) reaches 20-30Mpa in the vacuum hotpressing stove;
Step 4, first uniform decrease in temperature to 150 ℃-180 ℃ are taken out vacuum hotpressing stove with the good housing assembly (5) of welding; Naturally cool to normal temperature again, remove rise core (26) and plunger hole thermal insulation layer of plunger hole and (25).
2. vacuum diffusion welding according to claim 1 connects hydraulic pump or the bimetallic method of hydraulic motor cylinders, it is characterized in that, in the described step 1, it is that cylindrical inner diameter is conical structure that copper alloy cover (24) is processed into external diameter, plunger hole rises by the interior hole shape of core (26) cylindrical shape and copper alloy cover (24) according to the matched in clearance controlling dimension, and the spheric curvature of hemisphere face pressure head (21) is consistent with hemisphere face copper alloy plate (23).
3. vacuum diffusion welding according to claim 1 connects hydraulic pump or the bimetallic method of hydraulic motor cylinders, it is characterized in that, described step 2 relies on a kind of vacuum hotpressing stove Welding Structure, its structure is, in furnace body support (2), by support plate (9) the vacuum hotpressing furnace body is installed, the upper end of furnace body support (2) is provided with hydraulic cylinder (1), body of heater (3) at vacuum hotpressing stove has vacuum pumping hole (6), and vacuum pumping hole (6) is connected with vacuum unit outside the furnace body support (2); The electrode interface (7) of the heater in the body of heater (3) is connected with the electric-control system of vacuum hotpressing stove; Body of heater (3) inside is provided with lower support seat (8) and push-down head (4), push-down head (4) is arranged on the top of lower support seat (8), lower support seat (8) passes body of heater (3) downwards and is fixedly mounted on the base plate of furnace body support (2), and push-down head (4) upwards passes body of heater (3) back by connecting rod and is connected with hydraulic cylinder (1).
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|---|---|---|---|
| CN 201110399612 CN102528264B (en) | 2011-12-05 | 2011-12-05 | Bimetal vacuum diffusion welding method of hydraulic pump/motor cylinder body |
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|---|---|---|---|
| CN 201110399612 CN102528264B (en) | 2011-12-05 | 2011-12-05 | Bimetal vacuum diffusion welding method of hydraulic pump/motor cylinder body |
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| CN114473169B (en) * | 2022-02-28 | 2024-05-07 | 西安东瑞增材科技股份有限公司 | Diffusion welding method for bimetal cylindrical surface-shaped structure wind tunnel electrode |
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| JPS57160586A (en) * | 1981-03-30 | 1982-10-02 | Mitsubishi Heavy Ind Ltd | Local sealing type diffusion welding device |
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