CN108406222B - Repairing method for micro cracks on inner wall of micro deep hole with large depth-diameter ratio - Google Patents
Repairing method for micro cracks on inner wall of micro deep hole with large depth-diameter ratio Download PDFInfo
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- CN108406222B CN108406222B CN201810245083.9A CN201810245083A CN108406222B CN 108406222 B CN108406222 B CN 108406222B CN 201810245083 A CN201810245083 A CN 201810245083A CN 108406222 B CN108406222 B CN 108406222B
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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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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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Abstract
The invention provides a method for repairing micro cracks on the inner wall of a micro deep hole with a large depth-diameter ratio, which comprises the following steps: one end of the micro deep hole with large depth-diameter ratio in the workpiece is sealed by a baffle; processing a radial through hole communicated with the micro deep hole with the large depth-diameter ratio on a workpiece or a baffle close to one side of the baffle; gluing the inner wall of the micropore; a workpiece on one side of the clamping baffle rotates at a high speed, so that a negative pressure state is formed in the inner channel of the micro-deep hole with the large depth-diameter ratio; spraying alloy powder on the workpiece at the end which is not sealed by the baffle through the nozzle, wherein the alloy powder and the glue fully penetrate into the microcracks on the inner wall of the hole under the action of centrifugal force, and the alloy powder is uniformly adhered to the surface of the inner wall of the hole and the microcracks; after the mixture of the alloy powder and the glue is solidified, cladding the inner wall of the micro-deep hole with the large depth-diameter ratio until the alloy powder is completely and uniformly melted, filling micro cracks on the inner wall, and finishing repair; the baffle and the radial through holes are removed. The invention can solve the technical problem that the powder is difficult to coat by the large depth-diameter ratio micro-deep hole cladding.
Description
Technical Field
The invention relates to the field of micro deep hole crack repair, in particular to a method for repairing micro cracks on the inner wall of a micro deep hole with a large depth-diameter ratio.
Background
The shaft metal part is processed by a micro deep hole (the hole diameter is less than 500 mu m) with a large depth-diameter ratio (more than 100), and the following methods can be adopted: electric discharge machining, electrolytic machining, and the like. The electric spark machining mode can realize the machining of the micro deep hole with the large depth-diameter ratio, but can generate the micro cracks of the recast layer on the inner wall of the hole. The electrolytic machining method does not produce a recast layer, but the efficiency is far lower than that of the electric discharge machining method, and efficient porous machining is difficult to achieve. Aiming at the problem of repairing the micro cracks of the recast layer, the recast layer repairing method caused by laser micropore machining in the prior art is disclosed in application number 201510821721.3, but for a micro deep hole with a large depth-diameter ratio, the direct powder spraying is easy to cause orifice blockage, the micro deep hole is difficult to realize, namely the aperture is less than 500 mu m, the depth is more than 50mm, the powder is effectively applied to the whole inner wall, and the effective cladding is difficult to be performed on the whole inner wall with the deep hole being more than 50mm due to the limitation of the laser focal depth.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for repairing micro cracks on the inner wall of a micro deep hole with a large depth-diameter ratio, which can solve the technical problems that the micro deep hole with the large depth-diameter ratio is difficult to be powdered and the micro cracks on the inner wall of the hole are difficult to repair during cladding, and has good application prospect.
The present invention achieves the above-described object by the following technical means.
A method for repairing micro cracks on the inner wall of a micro deep hole with a large depth-diameter ratio comprises the following steps:
s01: one end of the micro deep hole with large depth-diameter ratio in the workpiece is sealed by a baffle; processing a radial through hole communicated with the micro deep hole with the large depth-diameter ratio on a workpiece or a baffle close to one side of the baffle;
s02: gluing the inner wall of the micropore;
s03: a workpiece on one side of the clamping baffle rotates at a high speed, so that a negative pressure state is formed in the inner channel of the micro-deep hole with the large depth-diameter ratio; spraying alloy powder on a workpiece at the end which is not sealed by the baffle plate through the nozzle, sucking the alloy powder at the inlet of the micro-deep hole with a large depth-diameter ratio into the hole and adhering the alloy powder to the inner wall of the hole, fully infiltrating the alloy powder and glue into microcracks on the inner wall of the hole under the action of centrifugal force, and uniformly adhering the alloy powder to the surface of the inner wall of the hole and the microcracks;
s04: after the mixture of the alloy powder and the glue is solidified, cladding the inner wall of the micro-deep hole with the large depth-diameter ratio until the alloy powder is completely and uniformly melted, filling micro cracks on the inner wall, and finishing repair;
s05: the baffle and the radial through holes are removed.
Further, the depth-to-diameter ratio of the large depth-to-diameter ratio micro-deep hole is more than 100.
Further, the diameter of the large depth-diameter ratio micro deep hole is 100-500 μm.
Further, the alloy powder is nickel chromium-chromium carbide composite powder.
Further, the step S02 is specifically to vertically insert the workpiece into a glue pool along the axial direction, and glue is applied to the inner wall of the micro-hole.
Further, in the step S03, the high-speed rotation is that the rotating speed is more than 3000r/min, the diameter of an outlet of the nozzle is 15mm, the pressure in the nozzle is 0.3MPa, and the distance between the nozzle and an inlet of the axial hole of the workpiece is less than 10 mm.
Further, in the step S01, specifically, the baffle plate is hermetically welded in the micro-deep hole with the large depth-diameter ratio at one end, and a radial through hole perpendicular to the micro-deep hole with the large depth-diameter ratio is machined on the workpiece close to the baffle plate.
Further, in the step S01, a baffle plate is welded to one end of the workpiece, a groove communicated with the deep hole with the large depth-diameter ratio of the workpiece is formed in the baffle plate, a radial through hole communicated with the groove is formed in the baffle plate, and the radial through hole is perpendicular to the deep hole with the large depth-diameter ratio.
The invention has the beneficial effects that:
1. according to the method for repairing the micro cracks on the inner wall of the micro deep hole with the large depth-diameter ratio, the alloy powder can be uniformly adhered to the surface of the inner wall of the hole and in the micro cracks by enabling the inner channel of the micro deep hole with the large depth-diameter ratio to form a negative pressure state.
2. According to the method for repairing the micro cracks on the inner wall of the micro deep hole with the large depth-diameter ratio, the inner wall of the micro deep hole is treated by adopting the processes of gluing, self-rotating powder absorption, electric spark cladding and the like, and the alloy powder is used for cladding the micro cracks on the recasting layer, so that the micro cracks are filled, and the effect of strengthening the metallographic structure of the recasting layer is achieved.
3. The method for repairing the micro cracks on the inner wall of the micro deep hole with the large depth-diameter ratio can be suitable for two conditions of large machining allowance and insufficient machining allowance of a workpiece through various structures of the baffle.
Drawings
FIG. 1 is a diagram of the position of a micro-deep hole with a large depth-to-diameter ratio of a workpiece according to the present invention.
Fig. 2 is a front view of the workpiece after step S01 of the present invention.
Fig. 3 is a cross-sectional view of fig. 2.
FIG. 4 is a schematic diagram of the operation of step S03 according to the present invention.
Fig. 5 is a structural view of a baffle of embodiment 1 of the invention.
Fig. 6 is a structural view of embodiment 2 of the baffle of the present invention.
In the figure:
1-a baffle plate; 2-alloy powder; 3-a nozzle; 4-groove.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
A shaft type rotating part made of 304 stainless steel materials is selected as a workpiece, the diameter of the shaft type rotating part is 120mm, the length of the shaft type rotating part is 1500mm, axial hole operation is completed, and as shown in figure 1, no axial allowance is reserved. The depth-to-diameter ratio of the large depth-to-diameter ratio micro-deep hole is more than 100, namely h: d >100, this example is satisfactory. The diameter of the micro deep hole with the large depth-diameter ratio is 100-:
s01: one end of the micro deep hole with large depth-diameter ratio in the workpiece is sealed by a baffle plate 1; processing a radial through hole communicated with the micro deep hole with the large depth-diameter ratio on the workpiece close to one side of the baffle plate 1 or the baffle plate 1; when the axial machining allowance of the workpiece is large, the baffle plate 1 is welded in the micro deep hole with the large depth-diameter ratio in a sealing mode, namely, the baffle plate is sealed in a plug welding hole mode, and a radial through hole perpendicular to the micro deep hole with the large depth-diameter ratio is machined on the workpiece close to one side of the baffle plate 1. When the axial machining allowance of the workpiece is small, as shown in fig. 2 and 3, a baffle plate 1 is welded at one end of the workpiece, and a radial through hole communicated with the micro-deep hole with the large depth-diameter ratio is machined in the baffle plate 1.
S02: gluing the inner wall of the micropore; specifically, a workpiece is vertically inserted into a glue pool along the axial direction, and the inner wall of a micropore is glued.
S03: a workpiece on one side of the clamping baffle 1 rotates at a high speed, so that a negative pressure state is formed in the inner channel of the micro-deep hole with a large depth-diameter ratio; spraying alloy powder 2 to a workpiece at one end which is not sealed by the baffle plate 1 through the nozzle 3, sucking the alloy powder 2 at an inlet of the micro-deep hole with a large depth-diameter ratio into the hole and adhering the alloy powder to the inner wall of the hole, fully infiltrating the alloy powder 2 and glue into microcracks on the inner wall of the hole under the action of centrifugal force, and uniformly adhering the alloy powder 2 to the surface of the inner wall of the hole and the microcracks; the high-speed rotation is that the rotating speed is more than 3000r/min, the diameter of an outlet of the nozzle 3 is 15mm, the pressure in the nozzle 3 is 0.3MPa, and the distance between the nozzle 3 and an inlet of an axial hole of a workpiece is less than 10 mm. The alloy powder 2 is a nickel chromium-chromium carbide composite powder, as shown in fig. 4.
S04: after the mixture of the alloy powder 2 and the glue is solidified, cladding the inner wall of the micropore after the powder is adhered by using special electric spark machining equipment for the micropore until the alloy powder 2 is completely and uniformly melted, filling the microcracks on the inner wall, and finishing the repair;
s05: the baffle 1 and the radial through holes are removed.
Fig. 5 is an embodiment 1 when the axial machining allowance of the workpiece is small, specifically, a blind hole at the same position as the deep hole with the large depth-to-diameter ratio on the workpiece is arranged on the baffle plate 1, and the baffle plate 1 is welded at one end of the workpiece to enable the blind hole to be communicated with the deep hole with the large depth-to-diameter ratio. And processing a radial through hole communicated with the blind hole on the baffle plate 1.
Fig. 6 shows an embodiment 2 when the axial machining allowance of the workpiece is small, specifically, a groove 4 is formed in a baffle plate 1, the baffle plate 1 is welded to one end of the workpiece to enable the groove 4 to be communicated with a micro-deep hole with a large depth-diameter ratio, and a radial through hole communicated with the groove 4 is machined in the baffle plate 1.
The invention provides a manufacturing method and processing steps of 2 baffles 4 of shaft workpieces with different processing allowances, which are characterized in that the inner walls of micro-deep holes are processed by adopting the processes of gluing, self-rotating powder absorption, electric spark cladding and the like, and alloy powder is utilized to clad micro-cracks on a recasting layer, so that the micro-cracks are filled, and the effect of strengthening the metallographic structure of the recasting layer is achieved.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (7)
1. The method for repairing the micro cracks on the inner wall of the micro deep hole with the large depth-diameter ratio is characterized by comprising the following steps of:
s01: one end of the micro deep hole with large depth-diameter ratio in the workpiece is sealed by a baffle (1); processing a radial through hole communicated with the micro deep hole with the large depth-diameter ratio on a workpiece close to one side of the baffle plate (1) or the baffle plate (1); the depth-to-diameter ratio of the micro deep hole with the large depth-to-diameter ratio is more than 100;
s02: gluing the inner wall of the micropore;
s03: a workpiece on one side of the clamping baffle (1) rotates at a high speed, so that a large depth-diameter ratio micro-deep hole inner channel forms a negative pressure state; spraying alloy powder (2) on a workpiece at the end which is not sealed by the baffle plate (1) through the nozzle (3), sucking the alloy powder (2) at the inlet of the micro-deep hole with a large depth-diameter ratio into the hole and adhering the alloy powder to the inner wall of the hole, fully infiltrating the alloy powder (2) and glue into the microcracks on the inner wall of the hole under the action of centrifugal force, and uniformly adhering the alloy powder (2) to the surface of the inner wall of the hole and the microcracks;
s04: after the mixture of the alloy powder (2) and the glue is solidified, cladding the inner wall of the micro-deep hole with the large depth-diameter ratio until the alloy powder (2) is completely and uniformly melted, filling the micro-cracks on the inner wall, and finishing repair;
s05: and removing the baffle (1) and the radial through hole.
2. The method for repairing the micro crack on the inner wall of the micro deep hole with the large depth-to-diameter ratio as claimed in claim 1, wherein the diameter of the micro deep hole with the large depth-to-diameter ratio is 100-500 μm.
3. The method for repairing the micro cracks on the inner wall of the micro deep hole with the large depth-diameter ratio according to claim 1, wherein the alloy powder (2) is nickel-chromium carbide composite powder.
4. The method for repairing the micro cracks on the inner wall of the micro-deep hole with the large depth-diameter ratio as claimed in claim 1, wherein the step S02 is specifically to vertically insert the workpiece into a glue pool along the axial direction and glue the inner wall of the micro-hole.
5. The method for repairing the micro cracks on the inner wall of the micro deep hole with the large depth-diameter ratio according to claim 1, wherein the high-speed rotation in the step S03 is a rotating speed of more than 3000r/min, the diameter of an outlet of the nozzle (3) is 15mm, the pressure in the nozzle (3) is 0.3MPa, and the distance between the nozzle (3) and an inlet of an axial hole of a workpiece is less than 10 mm.
6. The method for repairing the micro cracks on the inner wall of the large depth-diameter ratio micro-deep hole according to any one of claims 1 to 5, wherein in the step S01, a baffle plate (1) is hermetically welded at one end of the large depth-diameter ratio micro-deep hole, and a radial through hole perpendicular to the large depth-diameter ratio micro-deep hole is processed on a workpiece on one side close to the baffle plate (1).
7. The method for repairing the micro cracks on the inner wall of the micro deep hole with the large depth-to-diameter ratio according to any one of claims 1 to 5, wherein in the step S01, a baffle plate (1) is welded at one end of the workpiece, a groove (4) communicated with the micro deep hole with the large depth-to-diameter ratio of the workpiece is formed in the baffle plate (1), a radial through hole communicated with the groove (4) is machined in the baffle plate (1), and the radial through hole is perpendicular to the micro deep hole with the large depth-to-diameter ratio.
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| CN201810245083.9A CN108406222B (en) | 2018-03-23 | 2018-03-23 | Repairing method for micro cracks on inner wall of micro deep hole with large depth-diameter ratio |
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| CN201810245083.9A CN108406222B (en) | 2018-03-23 | 2018-03-23 | Repairing method for micro cracks on inner wall of micro deep hole with large depth-diameter ratio |
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| CN110640404A (en) * | 2019-09-24 | 2020-01-03 | 浙江中包派克奇包装有限公司 | Method for repairing fixed waist-round long slotted hole of slotting tool rest |
| CN110616426B (en) * | 2019-10-16 | 2023-05-05 | 南京先进激光技术研究院 | Laser inner hole cladding head for large-depth-diameter-ratio part and cladding processing system |
| CN111593340B (en) * | 2020-05-08 | 2022-06-07 | 陕西天元智能再制造股份有限公司 | Laser cladding method for inner wall of hydraulic support oil cylinder |
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| CN102747364B (en) * | 2012-06-14 | 2014-03-12 | 燕山大学 | Method for restoring inner bore of gear coupling |
| CN104708267A (en) * | 2015-04-02 | 2015-06-17 | 中国人民解放军军械工程学院 | Repairing method for cannon barrel inner chamber |
| CN105463448B (en) * | 2015-11-23 | 2018-06-01 | 江苏大学 | A kind of restorative procedure of re cast layer caused by laser micropore processing |
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