CN110977321A - Side surface contact friction surfacing repair method - Google Patents
Side surface contact friction surfacing repair method Download PDFInfo
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- CN110977321A CN110977321A CN201911297782.9A CN201911297782A CN110977321A CN 110977321 A CN110977321 A CN 110977321A CN 201911297782 A CN201911297782 A CN 201911297782A CN 110977321 A CN110977321 A CN 110977321A
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- 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
- B23P6/00—Restoring or reconditioning objects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
- B23K20/1245—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding characterised by the apparatus
- B23K20/1255—Tools therefor, e.g. characterised by the shape of the probe
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Abstract
The invention discloses a side surface contact friction surfacing repair method, which comprises the following steps: s1, preparing a rotating body and a friction head, wherein the rotating body and the friction head are both made of high-strength materials, the rotating body comprises a first cylindrical section, a conical section, a second cylindrical section, a matching section and a screw rod, a plurality of grooves and a plurality of raised grinding surfaces are arranged along the circumferential direction of the end part of the friction head, and then the first cylindrical section of the rotating body is coaxially fixed on a main shaft of a machine tool; fixedly attaching the metal patch to a wear area of the part; s2, starting the machine tool; s3, gradually enabling the rotating friction head to be close to the metal patch on the abrasion area, enabling the grinding surface of the friction head to contact the metal patch, and gradually increasing the lateral pressure of the grinding surface of the friction head pressing the metal patch to form a surfacing layer; s4, gradually moving the friction head along the surface of the metal patch, and then moving the friction head away; and S5, machining the overlaying layer by adopting a machining method. The invention is applied to the technical field of welding.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a side surface contact friction surfacing repair method.
Background
At present, after inner hole channels of metal parts such as bearing bushes and the like operate for a period of time, local abrasion of the surface of an inner side wall often occurs, so that the aperture of a local area is changed, the stable operation of an equipment transmission system is influenced, and the new bush parts are generally required to be replaced so as to ensure the normal operation of the equipment. However, the radial thickness of the worn area is compensated to a certain extent through the repair process, the worn area can be restored to the original aperture size after machining, and the manufacturing cost of the part can be reduced through repair. The existing repair method aiming at the radial thickness compensation of the local wear region of the inner hole channel of metal parts such as a bearing bush and the like mainly comprises the following steps: laser additive, arc build-up welding, thermal spraying, and the like. The repair method of laser material increase adopts a laser heat source to heat and fill metal materials (powder or wire materials) so as to melt the metal materials into liquid and clad on the surface of a wear area, and a new metal layer is formed after cooling, so that the radial thickness of the area is increased. The repair method of arc overlaying adopts an arc heat source to heat a filling metal material (powder or wire material) so as to melt the filling metal material into a liquid state and transfer the liquid state to the surface of a wear area, and a new metal layer is formed after cooling, so that the radial thickness of the area is increased. The repairing method of the thermal spraying is that metal powder is heated and melted by a plasma arc heat source to form molten drops, the metal molten drops are blown to a wear surface at high speed by high-pressure gas and cooled to form a new metal layer, and the radial thickness of the area is increased.
At present, when the radial thickness compensation is carried out on the worn area of the inner side wall of a part with a large depth/diameter ratio by adopting the existing repair methods such as laser material increase, arc surfacing, thermal spraying and the like, two limitations exist: (1) the operational accessibility is poor. When laser vibration material disk is repaired, the distance of a fixed focal length is required to be ensured between the laser emitting head and the heated area of the part, and when the distance between the worn area and the laser emitting head exceeds the focal length, the defocusing phenomenon can occur to the laser heat source, so that the energy density is greatly reduced, the surface metal can not be melted, and the surface repair can not be realized. The welding gun operation of the arc surfacing repair method generally needs a certain operation space, the inner hole channel of the part with the large depth/diameter ratio is often narrow and deep, and the welding gun is easy to interfere with the part and cannot be operated when being operated. Similarly, when thermal spraying repair is performed, an optimal distance needs to be ensured between a heat source and the surface of a part, the operating posture that the droplet injection direction is perpendicular to the repair surface is good, and an inner hole channel of the part with a large depth/diameter ratio is often narrow and deep, so that when the inner wall is repaired, the operation requirement is difficult to meet, and the repair effect is often poor. (2) The organization and performance of the repair area is not high. The repair area of laser additive and arc surfacing is a casting structure formed after metal is melted and solidified, the strength, fatigue and other properties of the structure are low, and the repair area is easy to have defects such as cracks, air holes and the like. The metal layers in the thermal sprayed repair area are generally non-metallurgically bonded, and the bonding strength is low.
Disclosure of Invention
Technical problem to be solved
A side contact friction surfacing repair method can conveniently perform radial thickness compensation on a worn area of the inner side wall of a part with a large depth/diameter ratio, defects such as cracks and air holes are not easily eliminated in the repair process, and the repair area is a fine-grain forged structure and has excellent mechanical properties. The method can effectively solve the problem of repairing the abrasion of the inner side wall of the part with the large depth/diameter ratio.
(II) technical scheme
In order to solve the technical problem, the invention provides a side surface contact friction surfacing repair method, which comprises the following steps:
s1, preparing a rotating body and a friction head, wherein the rotating body and the friction head are both made of high-strength materials, the rotating body comprises a first cylindrical section, a conical section, a second cylindrical section, a matching section and a screw rod which are sequentially arranged along the diameter reduction direction of the rotating body, the friction head is a short column body with a circular cross section, a plurality of grooves and a plurality of raised grinding surfaces are circumferentially arranged along the end part of the friction head, the grooves and the grinding surfaces are arranged in a staggered mode, a slotted hole is formed in the middle of the friction head, the friction head is assembled on the matching section through the slotted hole, and then the first cylindrical section of the rotating body is coaxially fixed on a main shaft of a machine tool;
fixedly attaching the metal patch to a wear area of the part;
s2, starting the machine tool to enable the rotating body to rotate, wherein the rotating body drives the friction head to synchronously rotate, and the rotating speed of the friction head is not lower than 500 r/min;
s3, gradually enabling the rotating friction head to approach the metal patch on the abrasion area, enabling the grinding surface of the friction head to contact the metal patch, gradually increasing the lateral pressure of the grinding surface of the friction head to compress the metal patch, and enabling the friction head to press the metal patch to rotate for a period of time to form a surfacing layer;
s4, gradually moving the friction head along the surface of the metal patch to form a surfacing layer between the metal patch and the wear area, and then moving the friction head away;
and S5, machining the overlaying layer by adopting a machining method.
In a further improvement, the taper of the cone section is 5-60 degrees.
In a further improvement, the length ratio of the conical section to the second cylindrical section is 0.1-10.
In a further improvement, the thickness of the metal patch is 0.05 mm-2 mm.
In a further improvement, in step S3, the lateral pressure is 0KN to 100 KN.
In a further modification, in step S4, the moving speed of the friction head is 0mm/S to 100 mm/S.
In a further improvement, in step S1, the depth of the groove is 0mm to 3 mm.
In a further improvement, the width ratio of the grinding surface to the groove is 0.5-5 along the circumferential direction of the friction head.
In a further improvement, the slot is strip-shaped, and the matching section is flat and matched with the slot.
In a further improvement, in step S1, a resistance spot welding method is used to fixedly attach the metal patch to the worn area of the part.
(III) advantageous effects
Compared with the prior art, the scheme of the invention has the following advantages:
the method has the advantages that: compared with repair methods such as laser material increase, arc surfacing and thermal spraying, the side contact friction surfacing repair method adopts a side contact friction heat generation mode, the heating mode can obtain molten metal (non-molten metal with certain fluidity), and the molten metal can be transited to a wear area through a groove on a friction head, so that a repair area forms a fine-grain forging structure, and the defects of a casting structure formed by solidification of the molten metal, cracks, air holes and the like generated during cooling in the traditional repair method are avoided.
The advantages are two: the side surface contact friction surfacing repair method can select the friction head with the corresponding diameter to be matched with the rotating body with the corresponding length according to the aperture size of the inner hole channel of the part and the depth size of the abrasion position, so that the abrasion area with the narrow channel aperture and the deep abrasion position can be conveniently repaired, and the problem that the inner wall of the channel of the part with the large depth/diameter ratio is abraded and cannot be repaired is solved.
The advantages are three: in the process of repairing the side-face contact friction surfacing, the rotating body drives the friction head to rotate at a high speed, and the friction head bears lateral pressure, and the structural form is similar to a cantilever beam structure. Therefore, according to the stress distribution characteristics of the cantilever beam, a special rotating body with high bending resistance is designed, wherein the cone angle of the conical body section is within the range of 5-60 degrees, and the ratio of the length of the conical body section to the length of the second cylindrical body section is within the range of 0.1-10; according to the requirements of heat generation by side surface contact friction and molten metal conveying requirements, a special friction head for side surface contact friction is designed, and a groove and a grinding surface are circumferentially arranged at the end part of the friction head. The ground surface functions to generate heat by friction, and the grooves function to feed molten or melted metal backward. Calculating friction heat generation efficiency of the grinding surface and input melting or melting efficiency of the groove according to a finite element method, determining that the depth of the groove can be in the range of 0 mm-3 mm, and the width ratio of the grinding surface to the groove can be in the range of 0.5-5.
Drawings
FIG. 1 is a schematic diagram of a side contact friction build-up welding repair process;
FIG. 2 is a schematic structural view of a rotating body;
FIG. 3 is a schematic structural view of the friction head;
fig. 4 is a schematic view of the rotating body and the distribution of the stress during the operation.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Please refer to fig. 1 to 4.
Example 1
A side contact friction surfacing repair method comprises the following steps:
s1, preparing the rotating body 1 and the friction head 2, wherein the rotating body 1 and the friction head 2 are made of high-strength materials (such as low-alloy steel, tool steel, ceramic and the like). The rotating body 1 comprises a first cylinder section 11, a cone section 12, a second cylinder section 13, a matching section 14 and a screw rod 15 which are sequentially arranged along the diameter reduction direction of the rotating body, wherein the diameter of the first cylinder section 11 is larger than that of a large-diameter end of the cone section 12, the diameter of a small-diameter end of the cone section 12 is larger than that of the second cylinder section 13, the diameter of the second cylinder section 13 is larger than that of the matching section 14, and the diameter of the matching section 14 is larger than that of the screw rod 15. The rotator 1 with the shape is designed mainly according to the distribution characteristics of the force borne by the rotator 1 in the working process, so that the rotator 1 is ensured to have high bending resistance in the working process, weight reduction is realized, the stability of the rotator 1 in the working process is improved, and the input power is reduced. Wherein the taper of the conical section 12 is 5-60 degrees, and the length ratio of the conical section 12 to the second cylindrical section 13 is 0.1-10. The friction head 2 is a short column body with a circular cross section, a plurality of grooves 21 and a plurality of raised grinding surfaces 22 are arranged along the circumferential direction of the end part of the friction head 2, the grooves 21 and the grinding surfaces 22 are arranged in a staggered mode, a groove hole 23 is formed in the middle of the friction head 2, the groove hole 23 is in a strip shape, the matching section 14 is in a flat shape matched with the groove hole 23, the friction head 2 is assembled on the matching section 14 through the groove hole 23, the depth of each groove 21 is 0 mm-3 mm, and the width ratio of the grinding surfaces 22 to the grooves 21 is 0.5-5. In order to ensure that the friction head 2 and the rotating body 1 do not slide during operation, the friction head 2 and the matching section 14 of the rotating body 1 are tightly connected through a locking nut. Then the first cylindrical section 11 of the rotating body 1 is coaxially fixed on the main shaft of the machine tool; it is required that the rotating body 1 and the spindle of the machine tool do not slip during high-speed rotation.
Fixedly attaching the metal patch 3 to a wear area of the part; the metal patch 3 is usually made of a material which is the same as or close to the material of the surface area of the part, the thickness of the metal patch 3 is 0.05 mm-2 mm, and the metal patch 3 is fixedly attached to the wear area of the part by adopting a resistance spot welding method. The grinding surface 22 is used for generating heat by contact friction with the surface of the metal patch 3 on the surface of the part, so that the metal patch 3 at the contact friction position and the near surface of the part below are heated to be melted or fused, the groove 21 is used for conveying metal substances in a molten or fused state to the rear, and accumulating and cooling the metal substances at the rear to form a surfacing layer, and the shape of the groove 21 can be triangular, rectangular, trapezoidal, semicircular and the like.
S2, the machine tool is started to rotate the rotary body 1, the rotary body 1 drives the friction head 2 to rotate synchronously, and the direction of the rotation of the friction head 2 is shown by arrow a in fig. 1. The rotating speed of the friction head 2 is not lower than 500 r/min; the suitable rotation rate can be selected depending on the melting point of the material. Generally, when the melting point of the material on the surface of the part is low, a lower rotation rate is selected, and conversely, a higher rotation rate is selected.
And S3, gradually approaching the rotating friction head 2 to the metal patch 3 on the wear area, contacting the grinding surface 22 of the friction head 2 with the metal patch 3, and gradually increasing the lateral pressure of the grinding surface 22 of the friction head 2 pressing the metal patch 3, wherein the lateral pressure is 0-100 KN. The friction head 2 presses the metal patch 3 to rotate for a period of time to form a surfacing layer;
and S4, gradually moving the friction head 2 along the surface of the metal patch 3, wherein the moving speed of the friction head 2 is 0-100 mm/S. Forming a surfacing layer between the metal patches 3 and the wear area, and then removing the friction head 2;
and S5, machining the overlaying layer by adopting a machining method to enable the overlaying layer to reach the final size requirement of the part, and performing surface treatment to enable the overlaying layer to reach the surface requirement of the part.
The present embodiment has the following advantages:
the method has the advantages that: compared with repair methods such as laser material increase, arc surfacing and thermal spraying, the side contact friction surfacing repair method adopts a side contact friction heat generation mode, molten metal (non-molten metal with certain fluidity) can be obtained by the heating mode, and the molten metal can be transited to a wear area through the groove 21 on the friction head 2, so that a repair area forms a fine-grain forging structure, and the defects of a casting structure formed by solidification of the molten metal, cracks, air holes and the like generated in cooling in the traditional repair method are avoided.
The advantages are two: the side surface contact friction surfacing repair method can select the friction head 2 with the corresponding diameter to be matched with the rotating body 1 with the corresponding length according to the aperture size of the inner hole channel of the part and the depth size of the abrasion position, so that the abrasion area with the narrow channel aperture and the deep abrasion position can be conveniently repaired, and the problem that the inner wall of the part channel with the large depth/diameter ratio is abraded and cannot be repaired is solved.
The advantages are three: in the process of repairing the side contact friction surfacing, the rotator 1 drives the friction head 2 to rotate at a high speed, and the friction head 2 bears lateral pressure, and the structural form is similar to a cantilever beam structure. Therefore, according to the stress distribution characteristics of the cantilever beam, a special rotating body 1 with high bending resistance is designed, wherein the taper angle of the conical body section 12 is within the range of 5-60 degrees, and the ratio of the length of the conical body section 12 to the length of the second cylindrical body section 13 is within the range of 0.1-10; according to the requirement of heat generation of side contact friction and the requirement of molten or molten metal delivery, a special friction head 2 for side contact friction is designed, and a groove 21 and a grinding surface 22 are circumferentially arranged at the end part of the friction head 2. The grinding surface 22 functions to generate heat by friction and the grooves 21 function to feed molten or melted metal backward. According to a finite element method, the friction heat generation efficiency of the grinding surface 22 and the input melting or melting efficiency of the groove 21 are calculated, the depth of the groove 21 is determined to be in the range of 0 mm-3 mm, and the width ratio of the grinding surface 22 to the groove 21 is determined to be in the range of 0.5-5.
In this embodiment, the specific implementation manner is as follows: the worn area (the position 50mm away from the upper surface, the axial height 20mm, the circumferential width 20mm and the maximum depth 0.3) of the inner hole channel (the specification: phi 200mm multiplied by the depth 100mm) of the TC4 titanium alloy part is repaired. The diameter phi of a friction head 2 made of ceramic material is 30mm, the height is 25mm, the depth of a triangular groove 21 on the friction head 2 is 1.0mm, the width is 2mm, and the width ratio of a grinding surface 22 to the groove 21 is 2: 1; the first cylindrical section 11 of the rotary body 1 made of tool steel has a specification of Φ 58mm × length 50mm, the taper of the conical section 12 is 30 °, the length is 60mm, and the specification of the second cylindrical section 13 is Φ 25mm × length 60 mm. The specific process is as follows: covering a wear area with a titanium alloy foil (specification of 25mm multiplied by 0.2mm), and fixing by adopting a resistance spot welding method; fixing the part on a workbench of a numerical control drilling machine through a tool, and enabling a damaged surface of the part to be in a vertical state after the part is tightly pressed; assembling the friction head 2 and the rotating body 1 into a whole, and clamping the first cylinder section 11 by adopting a clamping end of a spindle head of a drilling machine; and starting the drilling machine, so that the rotation speed of the friction head 2 is 3200r/min, the friction head gradually approaches the right side of the titanium alloy foil, and the bottom of the friction head 2 approaches the lower line of the foil. When the two contact, gradually increasing the lateral pressure of the contact position through displacement control to make the lateral pressure 20N, and then advancing along the direction indicated by an arrow B in figure 1 with the advancing speed of 5 mm/s; when the friction head 2 travels from one side of the titanium alloy foil to the other side, the operation is ended; repeating the steps for more than three times, and forming a 0.5mm cladding layer in the repair area; and machining the size of the repair area to the original size of the part.
Example 2
In this embodiment, the specific implementation manner is as follows: the worn area (10 mm position from the upper surface, 12mm axial height, 10mm circumferential width and 0.2mm maximum depth) of the inner hole channel (specification: phi 60mm multiplied by 50mm depth) of the 2024 aluminum alloy part is repaired. The diameter phi of a friction head 2 made of tool steel is 30mm, the height is 15mm, the depth of a triangular groove 21 on the friction head 2 is 0.8mm, the width is 1.2mm, and the width ratio of a grinding surface 22 to the groove 21 is 2: 1; the first cylindrical section 11 of the rotary body 1 made of tool steel has a specification of Φ 58mm × length 50mm, the taper of the conical section 12 is 30 °, the length is 60mm, and the specification of the second cylindrical section 13 is Φ 25mm × length 30 mm. The specific process is as follows: covering an aluminum alloy foil (the specification is 15mm multiplied by 12mm multiplied by 0.2mm) on a wear area, and fixing by adopting a resistance spot welding method; fixing the part on a workbench of a numerical control drilling machine through a tool, and enabling a damaged surface of the part to be in a vertical state after the part is tightly pressed; assembling the friction head 2 and the rotating body 1 into a whole, and clamping the first cylinder section 11 by adopting a clamping end of a spindle head of a drilling machine; the drill press is started so that the rotation speed of the friction head 2 is 1000r/min and gradually approaches the right side of the aluminum alloy foil, and the bottom of the friction head 2 approaches the lower line of the foil. When the two contact, gradually increasing the lateral pressure of the contact position through displacement control to make the lateral pressure 15N, and then advancing along the direction indicated by an arrow B in figure 1 at a advancing speed of 10 mm/s; when the friction head 2 travels from one side to the other side of the aluminum alloy foil, the operation is ended; repeating the steps for more than two times to form a 0.35mm cladding layer in the repair area; and machining the size of the repair area to the original size of the part.
Example 3
In this embodiment, the specific implementation manner is as follows: the worn area (position 100mm from the upper surface, axial height 60mm, circumferential width 100mm, and maximum depth 0.1mm) of the inner bore channel (specification: phi 200mm x depth 500mm) of the 304 stainless steel part was repaired. The diameter phi of a friction head 2 made of ceramic material is 80mm, the height is 50mm, the depth of a triangular groove 21 on the friction head 2 is 1.2mm, the width is 2.0mm, and the width ratio of a grinding surface 22 to the groove 21 is 2: 1; the first cylindrical section 11 of the rotary body 1 made of tool steel has a specification of phi 65mm x 50mm in length, the taper of the conical section 12 is 20 ° and the length is 100mm, and the second cylindrical section 13 has a specification of phi 30mm x 80mm in length. The specific process is as follows: covering a wear area with a stainless steel foil (the specification is 15mm multiplied by 12mm multiplied by 0.3mm), and fixing by adopting a resistance spot welding method; fixing the part on a workbench of a numerical control drilling machine through a tool, and enabling a damaged surface of the part to be in a vertical state after the part is tightly pressed; assembling the friction head 2 and the rotating body 1 into a whole, and clamping the first cylinder section 11 by adopting a clamping end of a spindle head of a drilling machine; starting a drilling machine, enabling the rotation speed of a friction head 2 to be 2500r/min, enabling the rotation speed to gradually approach a stainless steel foil, enabling the contact position of the friction head 2 to be as shown in figure 1, to approach the right side edge of the stainless steel foil, enabling the bottom of the friction head 2 to approach the lower side edge of the stainless steel foil, gradually increasing the lateral pressure of the contact position through displacement control when the two contact, enabling the lateral pressure to be 20N, then advancing along the direction shown by an arrow B in figure 1, and enabling the advancing speed to be 8 mm/s; when the friction head 2 moves from one side of the stainless steel foil to the other side, the operation is finished, and a 0.2mm cladding layer is formed in the repair area; then, carrying out second operation, wherein the initial contact position of the friction head 2 is close to the right side line of the stainless steel foil, the bottom of the friction head 2 moves upwards by 40mm, and a 0.2mm cladding layer is formed in a repair area by the same operation parameters; and machining the size of the repair area to the original size of the part.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A side surface contact friction surfacing repair method is characterized by comprising the following steps:
s1, preparing a rotating body and a friction head, wherein the rotating body and the friction head are both made of high-strength materials, the rotating body comprises a first cylindrical section, a conical section, a second cylindrical section, a matching section and a screw rod which are sequentially arranged along the diameter reduction direction of the rotating body, the friction head is a short column body with a circular cross section, a plurality of grooves and a plurality of raised grinding surfaces are circumferentially arranged along the end part of the friction head, the grooves and the grinding surfaces are arranged in a staggered mode, a slotted hole is formed in the middle of the friction head, the friction head is assembled on the matching section through the slotted hole, and then the first cylindrical section of the rotating body is coaxially fixed on a main shaft of a machine tool;
fixedly attaching the metal patch to a wear area of the part;
s2, starting the machine tool to enable the rotating body to rotate, wherein the rotating body drives the friction head to synchronously rotate, and the rotating speed of the friction head is not lower than 500 r/min;
s3, gradually enabling the rotating friction head to approach the metal patch on the abrasion area, enabling the grinding surface of the friction head to contact the metal patch, gradually increasing the lateral pressure of the grinding surface of the friction head to compress the metal patch, and enabling the friction head to press the metal patch to rotate for a period of time to form a surfacing layer;
s4, gradually moving the friction head along the surface of the metal patch to form a surfacing layer between the metal patch and the wear area, and then moving the friction head away;
and S5, machining the overlaying layer by adopting a machining method.
2. A side contact friction weld overlay repair method according to claim 1 wherein the taper of the cone segments is between 5 ° and 60 °.
3. The side contact friction weld overlay repair method according to claim 1, wherein the ratio of the length of the conical body section to the length of the second cylindrical body section is 0.1 to 10.
4. The side contact friction surfacing repair method according to claim 1, wherein the thickness of the metal patch is 0.05mm to 2 mm.
5. The side-contact friction weld overlay repair method according to claim 1, wherein the lateral pressure is 0KN to 100KN in step S3.
6. The side-contact hardfacing restoration method according to claim 1, wherein, in step S4, the speed of movement of the friction head is 0mm/S to 100 mm/S.
7. The side contact friction surfacing repair method according to claim 1, wherein in step S1, the depth of the groove is 0mm to 3mm, and the ratio of the width of the ground surface to the width of the groove is 0.5 to 5.
8. The side contact friction weld overlay repair method according to claim 1, wherein the slot is bar-shaped and the engagement section is flat-shaped to engage with the slot.
9. The side-contact friction weld overlay repair method according to claim 1, wherein in step S1, the metal patches are fixedly attached to the worn areas of the part by resistance spot welding.
10. The method of side contact friction weld overlay repair according to any one of claims 1 to 9, wherein the rotator and friction head are of low alloy steel, tool steel, ceramic or composite material.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1304816A (en) * | 1999-11-24 | 2001-07-25 | 株式会社日立制作所 | Rotary friction welding method |
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