CN112659493A - Multi-metal bar material, screw and preparation method thereof - Google Patents
Multi-metal bar material, screw and preparation method thereof Download PDFInfo
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- CN112659493A CN112659493A CN202011242969.1A CN202011242969A CN112659493A CN 112659493 A CN112659493 A CN 112659493A CN 202011242969 A CN202011242969 A CN 202011242969A CN 112659493 A CN112659493 A CN 112659493A
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Abstract
The invention discloses a multi-metal bar and a preparation method thereof, wherein the multi-metal bar comprises a mandrel, a wear-resistant corrosion-resistant outer layer and a transmission shaft, the wear-resistant corrosion-resistant outer layer axially covers the surface of the mandrel, the wear-resistant corrosion-resistant outer layer is metallurgically bonded with the mandrel, and the end surfaces of the mandrel and the wear-resistant corrosion-resistant outer layer are metallurgically bonded with the end surface of the transmission shaft. The preparation method of the multi-metal bar stock sequentially comprises the following steps: step 1): matching the mandrel with the transmission shaft; step 2): the matched mandrel and the transmission shaft are put into a sheath, and then wear-resistant and corrosion-resistant alloy powder is put into a gap between the mandrel and the sheath; step 3): vacuumizing and degassing a sheath provided with a mandrel, a transmission shaft and wear-resistant and corrosion-resistant alloy powder; step 4): and carrying out hot isostatic pressing treatment on the vacuum-pumped and degassed sheath. The outer layer material of the working part of the invention has high hardness, wear resistance and corrosion resistance, and the inner layer mandrel material has good toughness, so that the screw rod is not only wear resistant and corrosion resistant, but also not easy to break.
Description
Technical Field
The invention belongs to the technical field of plastic forming mechanical parts, and particularly relates to a multi-metal bar, a screw and a preparation method thereof.
Background
As an important high polymer material, the plastic plays an important role in the fields of human daily life and engineering. During the production of plastics, some strongly corrosive substances, such as sulfuric acid, nitric acid, hydrochloric acid, phosphoric acid, etc., are often generated. Meanwhile, in order to improve strength, toughness, breakage resistance and heat resistance of plastic products, a large amount of reinforcement additives, such as ceramic powder, glass fiber and the like, need to be added to the plastic. Therefore, with the improvement of the performance requirements of plastic products, higher requirements are put on the heat resistance, wear resistance, corrosion resistance and the like of the key parts of plastic machinery. The prior widely used materials such as die steel, stainless steel, surface nitriding steel and the like can not meet the use requirements, and in the environment of corrosive medium and added glass fiber, parts such as a screw rod, a charging barrel and the like which are in direct contact with the materials are quickly lost and scrapped, so that the normal operation of injection molding production is seriously influenced, the parts need to be frequently replaced, the production efficiency is low, the cost is high, and the quality of products is poor and unstable. Wear-resistant and corrosion-resistant materials are the inevitable choice for such screws for plastic machines.
If the screw is processed by using an integral wear-resistant corrosion-resistant alloy bar material, on one hand, the cost is high because the alloy material is usually high in price; on the other hand, the hardness of the material is high and reaches more than HRC 60, so that the processing of the external spline of the transmission shaft part becomes very difficult, even cannot be processed, and catastrophic accidents such as fracture and the like are easy to occur in the use process due to high hardness and low toughness. If a common bimetallic bar is used, namely the inner core shaft and the transmission shaft are made of integral alloy steel, the outer layer is made of a wear-resistant and corrosion-resistant material. If the mandrel and the transmission shaft are made of steel with small elastic modulus, lower strength and good plasticity, the transmission shaft can deform in some working scenes with large torque, and the use requirements cannot be met. If the mandrel and the transmission shaft are made of steel with large elastic modulus, high strength and poor plasticity, the wear-resistant layer is easy to crack because the stress between the mandrel and the wear-resistant layer is too large in the production process.
Patent CN102773991 discloses a metal screw and a manufacturing method thereof, the manufacturing method thereof is: putting the screw rod core rod into the sheath, and filling the proportioned raw material powder into the gap between the screw rod core rod and the sheath; putting the whole sheath into a sealed container and vacuumizing; sintering in a sealed container, and finishing the multi-element boride-based cermet layer to obtain the metal screw. The prepared metal screw has high wear resistance, high corrosion resistance and high fracture toughness. But the technology of the invention has the defect that the rigidity, the strength and the toughness of the mandrel material cannot be considered at the same time. If steel with small elastic modulus, low strength and good plasticity is adopted, the transmission part can deform in some working scenes with large torque, and the use requirement cannot be met. If steel with large elastic modulus, high strength and poor plasticity is adopted, the wear-resistant layer is easy to crack because the stress between the mandrel and the wear-resistant layer is too large in the production process.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention aims to provide a multi-metal bar material, a screw and a preparation method thereof.
The technical scheme adopted by the invention for solving the technical problem is as follows:
the utility model provides a many metal bar, many metal bar includes dabber, wear-resisting corrosion resistance skin and transmission shaft, the outer axial cladding of following of wear-resisting corrosion resistance is in the surface of dabber, wear-resisting corrosion resistance skin with the dabber combines for the metallurgy, the dabber with the outer terminal surface of wear-resisting corrosion resistance with the terminal surface metallurgy of transmission shaft combines.
In the multi-metal bar stock, as a preferred embodiment, the material of the mandrel is alloy steel with high toughness and higher strength; the transmission shaft is made of high-strength alloy steel with high hardness and rigidity.
In the multi-metal bar stock, as a preferred embodiment, the material of the wear-resistant and corrosion-resistant outer layer is at least one of an iron-based alloy, a nickel-based alloy, a cobalt-based alloy and a cermet material;
in the multi-metal bar stock, the material of the mandrel is at least one of 45# steel, 40Cr, 35CrMo and 42CrMo steel as a preferred embodiment.
In the multi-metal bar stock, the material of the transmission shaft is at least one of M340, M390, CPM10V, Cr12MoV and 440C steel as a preferred embodiment.
In the multi-metal bar stock, as a preferred embodiment, a groove is arranged on the end surface of the transmission shaft, which is metallurgically bonded with the mandrel, and the end part of the mandrel is arranged in the groove of the transmission shaft; more preferably, the groove is located in the center of the end face of the drive shaft.
In the multi-metal bar stock, as a preferred embodiment, the depth of the groove is 5-10 mm.
A preparation method of a multi-metal bar stock sequentially comprises the following steps:
step 1): matching the mandrel with the transmission shaft;
step 2): the matched mandrel and the transmission shaft are put into a sheath, and then wear-resistant and corrosion-resistant alloy powder is put into a gap between the mandrel and the sheath;
step 3): vacuumizing and degassing the sheath filled with the mandrel, the transmission shaft and the wear-resistant corrosion-resistant alloy powder;
step 4): and carrying out hot isostatic pressing treatment on the vacuum-pumped and degassed sheath to obtain the multi-metal bar stock.
In the above method for preparing a multi-metal bar stock, as a preferred embodiment, in the step 1), the mandrel material is processed into a desired shape and size to obtain the mandrel; and processing the transmission shaft material into a required shape and size to obtain the transmission shaft.
In the above method for preparing a multi-metal bar stock, as a preferred embodiment, in the step 1), the mandrel material is low alloy steel, and preferably, the mandrel is at least one of 45# steel, 40Cr, 35CrMo and 42 CrMo.
In the above method for preparing a multi-metal bar stock, as a preferred embodiment, in step 1), the material of the transmission shaft is at least one of M340, M390, CPM10V, Cr12MoV and 440C alloy steel.
In the preparation method of the multi-metal bar stock, as a preferred embodiment, the step 1) is specifically: a groove is formed in the end face of one end of the transmission shaft, one end of the mandrel is inserted into the groove to be matched, and then the mandrel and the transmission shaft are spot-welded to prevent the mandrel and the transmission shaft from being separated; preferably, the groove is located in the center of the end face of the transmission shaft; preferably, the depth of the groove is 5-10 mm, and the connection strength of the mandrel and the transmission shaft can be well guaranteed due to the depth of the groove; preferably, the spot welding is argon tungsten-arc welding; preferably, the end part side face of the mandrel is in clearance fit with the groove, and more preferably, when the groove is in clearance fit with the mandrel, the clearance between the groove and the mandrel is 0.02-0.1 mm.
In the above method for preparing a multi-metal bar stock, as a preferred embodiment, in the step 2), there is no gap between the transmission shaft and the sheath.
In the above method for preparing a multi-metal bar stock, as a preferred embodiment, in the step 3), the wear-resistant and corrosion-resistant alloy powder is at least one of an iron-based alloy powder, a nickel-based alloy powder, a Co-based alloy powder and a cermet powder; the iron-based alloy is preferably M390 or 10V; the nickel-based alloy is preferably Ni60 or Ni 55; the cobalt-based alloy is preferably stellite 12, stellite 20 or stellite 6; the cermet material is preferably NiWC20 or NiWC 30.
In the above method for preparing a multi-metal bar stock, as a preferred embodiment, in the step 3), the wear-resistant and corrosion-resistant alloy powder is prepared by a gas atomization method; preferably, the wear-resistant and corrosion-resistant alloy powder is spherical or approximately spherical; preferably, the particle size of the wear-resistant and corrosion-resistant alloy powder is less than 1000 microns.
In the above method for preparing a multi-metal bar, as a preferred embodiment, in the step 3), the temperature of the vacuum degassing is 300 to 600 ℃ (for example, 350 ℃, 400 ℃, 450 ℃, 500 ℃, 550 ℃ and the like), and the degree of vacuum reaches 1 × 10-2The holding time after Pa is 2 to 6 hours (e.g., 3 hours, 4 hours, 5 hours, etc.).
In the above method for producing a multi-metal bar stock, as a preferred embodiment, in the step 4), the hot isostatic pressing temperature is 900 to 1200 ℃ (for example, 950 ℃, 1000 ℃, 1050 ℃, 1100 ℃, 1150 ℃ and the like), the pressure is 100 to 150MPa (for example, 110MPa, 120MPa, 130MPa, 140MPa and the like), and the holding pressure time is 2 to 6 hours (for example, 3 hours, 4 hours, 5 hours and the like); if the hiping temperature is too low to achieve a good bond, the hiping temperature is too high to be detrimental to the properties of the resulting multi-metal billet.
The multi-metal bar stock is prepared by the preparation method of the multi-metal bar stock.
A screw is formed by processing the multi-metal bar stock.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention adopts three-metal gradient compounding, the outer layer (hard layer), the mandrel and the transmission shaft are completely metallurgically bonded, and the bonding strength is high. The outer layer material of the working part has high hardness, wear resistance and corrosion resistance, and the inner layer mandrel material has good toughness, so that the screw rod is wear-resistant and corrosion-resistant and is not easy to break.
(2) The mandrel material has low hardness, good toughness and easy processing, so that the internal thread of the screw is easy to process, the processing cost is low, and the processing problem of the internal thread at the end of the screw made of the whole wear-resistant and corrosion-resistant material can be solved.
(3) The transmission shaft part of the invention has moderate hardness and high strength, not only has enough strength, but also is easy to process splines, and can solve the problem that the splines of the whole wear-resistant corrosion-resistant screw and the transmission part of the traditional bimetal wear-resistant corrosion-resistant screw are difficult to process.
(4) The invention adopts the alloy steel with relatively low price as the material of the transmission shaft such as the screw transmission part, thereby reducing the material cost of the screw.
Drawings
FIG. 1 is a schematic structural view of a multi-metal bar of the present invention;
FIG. 2 is a schematic view of an assembly structure of the mandrel and the transmission shaft;
FIG. 3 is a schematic view of a jacket assembly;
FIG. 4 is a photograph of the microstructure of the interface between the cobalt-based alloy and the mandrel at the outer layer, wherein the mandrel is arranged on the left side, and the wear-resistant and corrosion-resistant outer layer is arranged on the right side;
wherein, 1 is a mandrel, 2 is a wear-resistant and corrosion-resistant outer layer, 3 is a transmission shaft, 4 is a sheath, and 5 is wear-resistant and corrosion-resistant alloy powder.
Detailed Description
In order to highlight the objects, technical solutions and advantages of the present invention, the present invention is further illustrated by the following examples, which are presented by way of illustration of the present invention and are not intended to limit the present invention. The technical solution of the present invention is not limited to the specific embodiments listed below, and includes any combination of the specific embodiments.
As shown in fig. 1, the multi-metal composite bar material provided by the present invention is composed of three materials: the middle mandrel 1 is alloy steel with high toughness and high strength, the wear-resistant and corrosion-resistant outer layer 2 is high-hardness iron-based alloy, nickel-based alloy, cobalt-based alloy or cermet material with good wear resistance and corrosion resistance, and the transmission shaft 3 is partially alloy steel with high hardness, high rigidity and high strength. The hard layer, the mandrel and the transmission shaft are in perfect metallurgical bonding, and the bonding strength is high. The outer layer material of the working part has high hardness, wear resistance and corrosion resistance, and the inner layer mandrel material has good toughness, so that the multi-metal bar material is not only wear resistant and corrosion resistant, but also is not easy to break; the transmission shaft has moderate hardness, high toughness, enough strength and rigidity and easy spline machining.
The preparation method of the multi-metal composite bar provided by the invention comprises the following steps:
step 1: the mandrel material is processed into required shape and size according to the product requirement, and can be low alloy steel such as 45# steel, 40Cr, 35CrMo, 42CrMo and the like; processing a transmission shaft material into a required shape and size according to the product requirement, wherein the transmission shaft material can be Cr12MoV, 440C and other alloy steels; a groove is formed in the center of the end face of one end of the transmission shaft, the groove is in clearance fit with one end of the mandrel, the depth of the groove in the end face of the transmission shaft is 5-10 mm, and the clearance of the clearance fit between the groove and the mandrel is 0.02-0.1 mm;
step 2: one end of the mandrel 1 is inserted into a groove on the end face of the transmission shaft 3 for matching, and then the mandrel and the transmission shaft are spot-welded by argon tungsten-arc welding to prevent the mandrel and the transmission shaft from being separated;
and step 3: placing the assembled and spot-welded and fixed mandrel 1 and the transmission shaft 3 into a cylindrical hot isostatic pressing sheath 4 with an opening at one end, and fixing the mandrel 1 and the transmission shaft in the center of the sheath 4;
and 4, step 4: filling wear-resistant and corrosion-resistant alloy powder 5 into gaps between the sheath and the mandrel, and compacting and filling; the wear-resistant and corrosion-resistant alloy powder 5 can be one of iron-based alloy powder, nickel-based alloy powder, Co-based alloy powder and metal ceramic powder; the compaction method can be realized by knocking the outer wall of the sheath or adopting a vibration table for compaction;
and 5: placing the sheath after the charging and the compaction in a degassing furnace for vacuum degassing, wherein the temperature of the degassing furnace is 300-600 ℃, and the vacuum degree reaches 1 multiplied by 10-2Keeping the temperature for 2-6 hours after Pa;
step 6: and placing the degassed and sealed sheath into a hot isostatic pressing furnace for hot isostatic pressing treatment, wherein the hot isostatic pressing treatment temperature is 900-1200 ℃, the pressure is 100-150 MPa, the heat preservation and pressure maintaining time is 2-6 hours, and cooling and discharging to obtain the multi-metal bar.
Example 1
A multi-metal bar material comprises a mandrel 1, a wear-resistant corrosion-resistant outer layer 2 and a transmission shaft 3, wherein the mandrel 1 and the wear-resistant corrosion-resistant outer layer 2 are located at the front section of the multi-metal bar material, the transmission shaft 3 is located at the rear section of the multi-metal bar material, the wear-resistant corrosion-resistant outer layer 2 axially covers the surface of the mandrel 1, one end of the mandrel 1 is located in a groove (the depth of the groove is 5mm) in the center of one end face of the transmission shaft 3, and the mandrel 1, the wear-resistant corrosion-resistant outer layer 2 and the transmission shaft 3 are metallurgically bonded in pairs;
the material of the mandrel 1 is 42CrMo, the material of the transmission shaft 3 is Cr12MoV, the material of the wear-resistant and corrosion-resistant outer layer 2 is iron-based alloy powder, and the mass percentages of the specific chemical components are C: 2.5 percent; v: 10 percent; cr: 25 percent; mo: 1.5 percent; w: 0.5%, Ta: 2 percent; si: 0.7 percent; mn: 0.4 percent; the balance being Fe and minor impurities.
The method takes a 42CrMo material as a mandrel, and comprises the following steps of:
a) a42 CrMo bar stock is processed into a round rod with the diameter of 15mm and the length of 600mm to be used as a mandrel.
b) The Cr12MoV bar stock is processed into a round bar with the diameter of 50mm and the length of 380mm to be used as a transmission shaft, a groove with the diameter of 15mm and the depth of 5mm is processed in the center of one end face, the diameter tolerance of the groove meets the requirement of clearance fit with a mandrel, and the fit clearance meets 0.02-0.1 mm.
c) One end of the mandrel is inserted into the groove on the end face of the transmission shaft for matching, and then the mandrel and the transmission shaft are spot-welded by argon tungsten-arc welding.
d) And putting the assembled and spot-welded and fixed mandrel and the transmission shaft into a cylindrical hot isostatic pressing sheath with an opening at one end, and fixing the mandrel and the transmission shaft at the central position of the sheath.
e) Filling iron-based alloy powder prepared by a gas atomization method into a gap between the sheath and the mandrel, and compacting and filling the gap by using a vibration table (wherein no gap exists between the transmission shaft and the sheath). The iron-based alloy powder comprises the following chemical components in percentage by mass: 2.5 percent; v: 10 percent; cr: 25 percent; mo: 1.5 percent; w: 0.5%, Ta: 2 percent; si: 0.7 percent; mn: 0.4 percent; the balance being Fe and minor impurities.
f) Placing the sheath after charging and compacting in a degassing furnace for vacuum degassing, wherein the temperature of the degassing furnace is 300 ℃, and the vacuum degree reaches 1 x 10-2Keeping the temperature for 2 hours after Pa;
g) and placing the sheath subjected to degassing and sealing welding into a hot isostatic pressing furnace for hot isostatic pressing treatment, wherein the hot isostatic pressing treatment temperature is 1200 ℃, the pressure is 100MPa, the heat preservation and pressure maintaining time is 2 hours, and cooling and discharging to obtain the multi-metal bar stock.
The hardness of the wear-resistant and corrosion-resistant outer layer of the obtained multi-metal bar material is HRC 41. The interface bonding tensile strength of the wear-resistant and corrosion-resistant outer layer and the transmission shaft is 610 MPa.
Example 2
The method takes a 42CrMo material as a mandrel, and comprises the following steps of:
a) a42 CrMo bar stock is processed into a round rod with the diameter of 20mm and the length of 690mm to be used as a mandrel.
b) Processing 440C bar into diameter 55mm, length 420 mm's pole is as the transmission shaft to diameter 20mm, degree of depth 10 mm's recess is processed in the center of an terminal surface, and recess diameter tolerance satisfies carries out clearance fit with the dabber, and the fit clearance satisfies 0.02 ~ 0.1 mm.
c) One end of the mandrel is inserted into the groove on the end face of the transmission shaft for matching, and then the mandrel and the transmission shaft are spot-welded by argon tungsten-arc welding.
d) And putting the assembled and spot-welded and fixed mandrel and the transmission shaft into a cylindrical hot isostatic pressing sheath with an opening at one end, and fixing the mandrel and the transmission shaft at the central position of the sheath.
e) Filling Ni-based alloy powder prepared by a gas atomization method into gaps among the sheath, the core shaft and the transmission shaft, and compacting and filling by using a vibration table. The nickel-based alloy powder comprises the following chemical components in percentage by mass: 1.1 percent; cr: 10 percent; si: 2.5 percent; b: 1.5 percent; w: 15 percent; the balance being Ni and small amounts of impurities.
f) Placing the jacket after the charging and the compaction in a degassing furnace for vacuum degassing, wherein the heat preservation temperature of the degassing furnace is 600 ℃, and the vacuum degree reaches 1 multiplied by 10-2Keeping the temperature for 6 hours after Pa;
g) and placing the sheath subjected to degassing and sealing welding into a hot isostatic pressing furnace for hot isostatic pressing treatment, wherein the hot isostatic pressing treatment temperature is 900 ℃, the pressure is 150MPa, the heat preservation and pressure maintaining time is 6 hours, and cooling and discharging to obtain the multi-metal bar stock.
The hardness of the wear-resistant and corrosion-resistant outer layer of the obtained multi-metal bar material is HRC 63. The interface bonding tensile strength of the wear-resistant and corrosion-resistant outer layer and the transmission shaft is 450 MPa.
Example 3
The method takes a 42CrMo material as a mandrel, and comprises the following steps of:
a) a42 CrMo bar stock is processed into a round rod with the diameter of 30mm and the length of 750mm to be used as a mandrel.
b) The Cr18MoV bar stock is processed into a round bar with the diameter of 65mm and the length of 450mm, the round bar is used as a transmission shaft, a groove with the diameter of 30mm and the depth of 8mm is processed in the center of one end face, the diameter tolerance of the groove meets the requirement of clearance fit with a mandrel, and the fit clearance meets 0.02-0.1 mm.
c) One end of the mandrel is inserted into the groove on the end face of the transmission shaft for matching, and then the mandrel and the transmission shaft are spot-welded by argon tungsten-arc welding.
d) And putting the assembled and spot-welded and fixed mandrel and the transmission shaft into a cylindrical hot isostatic pressing sheath with an opening at one end, and fixing the mandrel and the transmission shaft at the central position of the sheath.
e) Filling the Co-based alloy powder prepared by the gas atomization method into gaps among the sheath, the mandrel and the transmission shaft, and compacting and filling by using a vibration table. The cobalt-based alloy powder comprises the following chemical components in percentage by mass: 1.8 percent; cr: 30 percent; si: 1.5 percent; w: 10 percent; the balance of Co and a small amount of impurities.
f) Placing the sheath after charging and compacting in a degassing furnace for vacuum degassing, wherein the temperature of the degassing furnace is 500 ℃, and the vacuum degree reaches 1 x 10-2Keeping the temperature for 3 hours after Pa;
g) and placing the capsule subjected to degassing and sealing welding into a hot isostatic pressing furnace for hot isostatic pressing treatment, wherein the hot isostatic pressing treatment temperature is 1100 ℃, the pressure is 120MPa, the heat preservation and pressure maintaining time is 3 hours, and cooling and discharging to obtain the multi-metal bar stock.
The hardness of the wear-resistant and corrosion-resistant outer layer of the obtained multi-metal bar material is HRC 60. The interface bonding tensile strength of the wear-resistant and corrosion-resistant outer layer and the transmission shaft is 760 MPa.
The screw rod of the invention can be processed by adopting the multi-metal bar stock obtained in the embodiment 1-3 according to actual needs (structure).
The foregoing embodiments illustrate the principles, principal features and advantages of the invention, and it will be understood by those skilled in the art that the invention is not limited to the foregoing embodiments, which are merely illustrative of the principles of the invention, and that various changes and modifications may be made therein without departing from the scope of the principles of the invention.
Claims (10)
1. The utility model provides a many metal bar, its characterized in that, many metal bar includes dabber, wear-resisting corrosion resistance skin and transmission shaft, the outer cladding of wear-resisting corrosion resistance is in along the axial the surface of dabber, wear-resisting corrosion resistance skin with the dabber is metallurgical combination, the dabber with the outer terminal surface of wear-resisting corrosion resistance with the terminal surface metallurgical combination of transmission shaft.
2. The multi-metal bar stock of claim 1, wherein the wear and corrosion resistant outer layer is at least one of an iron-based alloy, a nickel-based alloy, a cobalt-based alloy, and a cermet material;
the iron-based alloy is preferably M390 or 10V; the nickel-based alloy is preferably Ni60 or Ni 55; the cobalt-based alloy is preferably stellite 12, stellite 20 or stellite 6; the cermet material is preferably NiWC20 or NiWC 30;
preferably, the material of the mandrel is at least one of 45# steel, 40Cr, 35CrMo and 42CrMo steel;
preferably, the material of the transmission shaft is at least one of M340, M390, CPM10V, Cr12MoV and 440C steel.
3. A multi-metal bar stock as claimed in claim 1, wherein the end surface of the drive shaft that is metallurgically bonded to the mandrel is provided with a groove, the end of the mandrel being disposed within the groove of the drive shaft; more preferably, the groove is located in the center of the end face of the drive shaft;
preferably, the depth of the groove is 5-10 mm.
4. A preparation method of a multi-metal bar stock is characterized by sequentially comprising the following steps:
step 1): matching the mandrel with the transmission shaft;
step 2): the matched mandrel and the transmission shaft are put into a sheath, and then wear-resistant and corrosion-resistant alloy powder is put into a gap between the mandrel and the sheath;
step 3): vacuumizing and degassing the sheath filled with the mandrel, the transmission shaft and the wear-resistant corrosion-resistant alloy powder;
step 4): and carrying out hot isostatic pressing treatment on the vacuum-pumped and degassed sheath to obtain the multi-metal bar stock.
5. The method for preparing a multi-metal bar stock as defined in claim 4, wherein in step 1), the mandrel material is processed into a desired shape and size to obtain the mandrel; and processing the transmission shaft material into a required shape and size to obtain the transmission shaft.
6. The method of preparing a multi-metal bar stock as defined in claim 4, wherein in step 1) the mandrel material is a low alloy steel, preferably the mandrel is at least one of 45# steel, 40Cr, 35CrMo and 42 CrMo;
preferably, in the step 1), the transmission shaft material is at least one of M340, M390, CPM10V, Cr12MoV and 440C steel;
preferably, the step 1) is specifically: a groove is formed in the end face of one end of the transmission shaft, one end of the mandrel is inserted into the groove to be matched, and then the mandrel and the transmission shaft are spot-welded to prevent the mandrel and the transmission shaft from being separated; preferably, the groove is located in the center of the end face of the transmission shaft; preferably, the depth of the groove is 5-10 mm; preferably, the spot welding is argon tungsten-arc welding; preferably, the side face of the end part of the mandrel is in clearance fit with the groove, and more preferably, when the groove is in clearance fit with the mandrel, the clearance between the groove and the mandrel is 0.02-0.1 mm;
preferably, in the step 2), there is no gap between the transmission shaft and the sheath.
7. The method of preparing a multi-metal bar stock as set forth in claim 4,
in the step 3), the wear-resistant and corrosion-resistant alloy powder is at least one of iron-based alloy powder, nickel-based alloy powder, Co-based alloy powder and metal ceramic powder;
preferably, the wear-resistant and corrosion-resistant alloy powder is prepared by a gas atomization method; preferably, the wear-resistant and corrosion-resistant alloy powder is spherical or approximately spherical; preferably, the particle size of the wear-resistant and corrosion-resistant alloy powder is less than 1000 microns;
preferably, the temperature for vacuum-pumping and degassing is 300-600 ℃, and the vacuum degree reaches 1 multiplied by 10-2And keeping the temperature for 2-6 hours after Pa.
8. The method of preparing a multi-metal bar stock as set forth in claim 4,
in the step 4), the hot isostatic pressing treatment temperature is 900-1200 ℃, the pressure is 100-150 MPa, and the heat preservation and pressure maintaining time is 2-6 hours.
9. A multi-metal bar stock produced by the method of any one of claims 4 to 8.
10. A screw machined from a multi-metal bar stock as claimed in any one of claims 1 to 3 or claim 9.
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| CN202011242969.1A CN112659493A (en) | 2020-11-09 | 2020-11-09 | Multi-metal bar material, screw and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116329556A (en) * | 2023-03-31 | 2023-06-27 | 中机新材料研究院(郑州)有限公司 | Powder metallurgy preparation method of column product |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116329556A (en) * | 2023-03-31 | 2023-06-27 | 中机新材料研究院(郑州)有限公司 | Powder metallurgy preparation method of column product |
| CN116329556B (en) * | 2023-03-31 | 2024-04-05 | 中机新材料研究院(郑州)有限公司 | Processing equipment and preparation method of column product |
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