CN113106221A - Metal surface layer low-temperature mechanical strengthening method and device - Google Patents
Metal surface layer low-temperature mechanical strengthening method and device Download PDFInfo
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- CN113106221A CN113106221A CN202110307653.4A CN202110307653A CN113106221A CN 113106221 A CN113106221 A CN 113106221A CN 202110307653 A CN202110307653 A CN 202110307653A CN 113106221 A CN113106221 A CN 113106221A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/04—Hardening by cooling below 0 degrees Celsius
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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Abstract
The invention discloses a metal surface layer low-temperature mechanical strengthening method and a device, wherein the metal surface layer low-temperature mechanical strengthening method comprises the following steps: carrying out low-temperature treatment on the surface of a workpiece to be subjected to strengthening treatment to form a cooling layer on the surface of the workpiece; the surface of the workpiece is strengthened while maintaining the low-temperature treatment of the surface of the workpiece. The low-temperature mechanical strengthening method can reduce the surface roughness, reduce the surface defects, improve the fatigue strength and prolong the service life, and realize the active control of the metal surface state.
Description
Technical Field
The invention relates to the technical field of surface strengthening, in particular to a low-temperature mechanical strengthening method and device for a metal surface layer.
Background
The surface strengthening technology is one of important ways for improving the fatigue resistance of parts, and is widely applied to the manufacturing process of parts of carrying machines such as aerospace, vehicles, ships and warships due to high efficiency, low cost and no pollution. The principle of the surface mechanical strengthening is that under the continuous or intermittent action of external force, the metal on the surface layer of the material is plastically deformed to form residual compressive stress on the near-surface layer of the workpiece, and work hardening, microstructure change and the like are generated, so that fatigue crack initiation and expansion resistance are improved, and the fatigue life is prolonged.
The surface mechanical strengthening process mainly comprises rolling strengthening, shot peening strengthening, laser shock strengthening and the like, and different strengthening effects are achieved by different process modes. The rolling strengthening can obviously reduce the surface roughness, but has small effect on introducing residual compressive stress; in the shot peening strengthening process, the stress direction of the strengthened material is single, so that the surface plastic deformation is small, and the depth of the formed residual compressive stress layer is shallow; the laser shock peening is to use an absorption layer covered on the surface layer of a workpiece to absorb laser energy to explode, so that the material generates severe plastic deformation, and residual compressive stress with larger depth can be generated, but the surface roughness of the part is not reduced. Therefore, the single surface strengthening treatment has certain limitation on improving the surface performance of the material.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for low-temperature mechanical strengthening of a metal surface layer, which can reduce surface roughness, reduce surface defects, improve fatigue strength and service life, and realize active control of a metal surface state.
The invention adopts the following specific technical scheme:
the invention provides a low-temperature mechanical strengthening method for a metal surface layer, which comprises the following steps:
carrying out low-temperature treatment on the surface of a workpiece to be subjected to strengthening treatment to form a cooling layer on the surface of the workpiece;
the surface of the workpiece is strengthened while maintaining the low-temperature treatment of the surface of the workpiece.
Furthermore, a metal surface layer low-temperature mechanical strengthening device is adopted to carry out low-temperature treatment on the surface of the workpiece to be strengthened;
the metal surface layer low-temperature mechanical strengthening device comprises a fixed support, a low-temperature medium container, a low-temperature medium conveying pipe, a spraying ring, a plurality of nozzles, a strengthening treatment mechanism and a workpiece clamping mechanism;
the fixed bracket is used for supporting the spray ring and the strengthening treatment mechanism;
the low-temperature medium container is used for storing low-temperature medium;
the low-temperature medium conveying pipe is connected between the low-temperature medium container and the spray ring and is used for conveying the low-temperature medium stored in the low-temperature medium container to the internal flow passage of the spray ring;
the spray ring is arranged on the outer peripheral side of the workpiece;
the nozzle is detachably arranged on the spray ring, is communicated with an internal flow passage of the spray ring and is used for spraying a low-temperature medium to the surface of a workpiece;
the strengthening treatment mechanism is used for strengthening treatment on the surface of the workpiece;
the workpiece clamping mechanism is used for clamping a workpiece.
Further, before the surface of the workpiece to be strengthened is processed at low temperature, the method further comprises the following steps:
installing the metal surface layer low-temperature mechanical strengthening device, sleeving the spray ring on the outer peripheral side of the workpiece, enabling the outlet of the nozzle to face the surface of the workpiece, and setting the position and the number of the nozzles according to the shape of the workpiece.
Furthermore, the metal surface layer low-temperature mechanical strengthening device also comprises a flow meter and a control valve which are arranged on the low-temperature medium conveying pipe.
Further, when the workpiece is subjected to the strengthening treatment while maintaining the low-temperature treatment, the strengthening treatment process employs roll strengthening, shot peening, or laser shock strengthening.
Furthermore, the strengthening treatment mechanism comprises a tool rest arranged on the fixed support and a rolling cutter arranged on the tool rest.
Furthermore, the fixed support comprises a lathe bed and a sliding table of the numerical control machine; the spraying ring and the strengthening treatment mechanism are both fixedly arranged on the sliding table;
the workpiece clamping mechanism is a chuck and is fixedly arranged on the lathe bed.
In addition, the invention also provides a metal surface layer low-temperature mechanical strengthening device for executing the metal surface layer low-temperature mechanical strengthening method, which comprises a fixed bracket, a low-temperature medium container, a low-temperature medium conveying pipe, a spraying ring, a plurality of nozzles, a strengthening treatment mechanism and a workpiece clamping mechanism;
the fixed bracket is used for supporting the spray ring and the strengthening treatment mechanism;
the low-temperature medium container is used for storing low-temperature medium;
the low-temperature medium conveying pipe is connected between the low-temperature medium container and the spray ring and is used for conveying the low-temperature medium stored in the low-temperature medium container to the internal flow passage of the spray ring;
the spray ring is an annular tubular part, is provided with an internal flow passage, and is provided with a plurality of outlets communicated with the internal flow passage on the inner peripheral side;
each outlet is detachably provided with one nozzle, and the nozzles are used for spraying low-temperature medium;
the strengthening treatment mechanism is used for strengthening treatment on the surface of the workpiece;
the workpiece clamping mechanism is used for clamping a workpiece.
Furthermore, the fixed support comprises a lathe bed and a sliding table of the numerical control machine; the spraying ring and the strengthening treatment mechanism are both fixedly arranged on the sliding table;
the workpiece clamping mechanism is a chuck and is fixedly arranged on the lathe bed.
Furthermore, the strengthening treatment mechanism comprises a tool rest arranged on the fixed bracket and a rolling cutter arranged on the tool rest;
the low-temperature medium is liquid nitrogen or supercritical carbon dioxide.
Has the advantages that:
according to the metal surface layer low-temperature mechanical strengthening method, the surface of the workpiece is subjected to low-temperature treatment to form a cooling layer, and the surface of the workpiece is subjected to strengthening treatment while being subjected to low-temperature treatment, so that the concept of traditional heating auxiliary strengthening is broken, the cooling layer is constructed on the metal surface layer, the plasticity of surface layer metal is reduced, the hardness is improved, the deformation caused in the strengthening process is reduced, the surface roughness is reduced, the surface defects are reduced, and the service performance of the strengthened part is improved; by utilizing the temperature difference between the surface metal and the internal metal, the metal surface can generate larger residual compressive stress, the residual stress state of the processed surface is effectively improved, the initiation and the expansion of surface cracks are effectively inhibited, the fatigue strength is improved, and the service life is prolonged; the method has the advantages that the cohesiveness of metal materials can be effectively reduced, the damage of the cutter to the surface is reduced, the dependence on the cooling effect of the traditional cutting fluid is eliminated, and the method is economical and environment-friendly; the metal surface layer low-temperature mechanical strengthening method can be widely applied to the technical field of surface mechanical strengthening, and active control of the metal surface state is realized.
Drawings
FIG. 1 is a flow chart of the method for low temperature mechanical strengthening of a metal surface layer according to the present invention;
FIG. 2 is a schematic diagram of the mechanism of forming low-temperature strengthened residual stress on the metal surface layer;
FIG. 3 is a schematic structural diagram of a low-temperature mechanical strengthening device for a metal surface layer during a rolling strengthening process.
Wherein, 1-room temperature metal material, 2-cooling layer before strengthening, 3-cooling layer after strengthening, 4-metal material after recovering room temperature, 5-low temperature medium conveying pipe, 6-spraying ring, 7-spraying nozzle, 8-low temperature zone, 9-rolling cutter, 10-cutter frame, 11-fixed support, 12-workpiece clamping mechanism
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The embodiment of the invention provides a metal surface layer low-temperature mechanical strengthening method and a metal surface layer low-temperature mechanical strengthening device for executing the metal surface layer low-temperature mechanical strengthening method, wherein a flow chart of the metal surface layer low-temperature mechanical strengthening method is shown in fig. 1, a forming mechanism schematic diagram of residual stress of a metal surface layer in a low-temperature strengthening process is shown in fig. 2, and a structure schematic diagram of the metal surface layer low-temperature mechanical strengthening device is shown in fig. 3.
As shown in fig. 1, the method for low-temperature mechanical strengthening of a metal surface layer comprises the following steps:
step S20, low-temperature treatment is carried out on the surface of the workpiece to be strengthened, so that a cooling layer is formed on the surface of the workpiece; cooling the workpiece by carrying out low-temperature treatment on the workpiece, and forming a cooling layer with a certain depth on the surface of the workpiece to be subjected to strengthening treatment in advance; when the workpiece is subjected to low-temperature treatment, the low-temperature treatment can be realized by spraying a low-temperature medium on the surface of the workpiece, the temperature reduction of the workpiece and the depth of a cooling layer are controlled by controlling the flow, the speed and the acting time of the low-temperature medium, and the depth of the cooling layer is ensured to be larger than the depth of a strengthening layer; the temperature reduction range of the surface of the workpiece can be-195-room temperature; the low-temperature medium can adopt liquid nitrogen or supercritical carbon dioxide;
step S30, strengthening the surface of the workpiece while maintaining the low-temperature treatment of the surface of the workpiece; after the cooling layer is formed on the surface of the workpiece, the surface of the workpiece can be strengthened by adopting a rolling strengthening process, a shot peening process or a laser shock strengthening process under the condition of keeping the surface of the workpiece to be subjected to low-temperature treatment, so that the low-temperature strengthening of the surface of the workpiece is realized.
Fig. 2a-2d show the transformation of a metallic material during low temperature mechanical strengthening of the metallic material, wherein: FIG. 2a is a diagram showing the overall state of the room temperature metallic material 1 before the surface layer is mechanically strengthened at a low temperature, wherein the surface roughness of the room temperature metallic material 1 is high, and the crystal grains constituting the room temperature metallic material 1 are indicated by circles, and the crystal grains are in a perfect circle shape; fig. 2b shows the surface layer state of the metal material after the low temperature treatment, the cooling layer 2 before strengthening is formed on the surface layer of the metal material, and the metal surface layer is shrunk due to the low temperature treatment, the shrinkage of the metal surface layer material is limited in the metal material, the residual tensile stress is formed on the surface layer, the arrow extending towards the outer side of the metal material represents the residual tensile stress, and the crystal grains are also influenced by the residual tensile stress; FIG. 2c shows the state of the strengthened metal material, wherein the metal surface layer is still in a low temperature state and forms a strengthened cooling layer 3, the roughness value of the metal surface of the strengthened surface layer is reduced, the metal is plastically deformed to make the crystal grains thin and flat, and a residual compressive stress layer is formed, so that the arrows extending towards the inner side of the metal material represent the residual compressive stress; fig. 2d shows the state of the metal material 4 after the low temperature mechanical strengthening treatment and after the metal material is restored to room temperature, the metal surface layer expands when the metal material is restored to room temperature due to the difference in the temperatures of the inner and outer layers, the inner layer metal restricts the expansion, and the residual compressive stress is further increased to represent the residual compressive stress by arrows extending toward the inner side of the metal material.
According to the metal surface layer low-temperature mechanical strengthening method, the surface of the workpiece is subjected to low-temperature treatment to form a cooling layer, and the surface of the workpiece is subjected to strengthening treatment while being subjected to low-temperature treatment, so that the concept of traditional heating auxiliary strengthening is broken, the cooling layer is constructed on the metal surface layer, the plasticity of surface layer metal is reduced, the hardness is improved, the deformation caused in the strengthening process is reduced, the surface roughness is reduced, the surface defects are reduced, and the service performance of the strengthened part is improved; by utilizing the temperature difference between the surface metal and the internal metal, the metal surface can generate larger residual compressive stress, the residual stress state of the processed surface is effectively improved, the initiation and the expansion of surface cracks are effectively inhibited, the fatigue strength is improved, and the service life is prolonged; the method has the advantages that the cohesiveness of metal materials can be effectively reduced, the damage of the cutter to the surface is reduced, the dependence on the cooling effect of the traditional cutting fluid is eliminated, and the method is economical and environment-friendly; meanwhile, the strengthening method has the characteristics of low cost, high efficiency and wide application range; the metal surface layer low-temperature mechanical strengthening method can be widely applied to the technical field of surface mechanical strengthening, and active control of the metal surface state is realized.
When the surface of the workpiece to be strengthened is treated at low temperature by adopting the method, a metal surface layer low-temperature mechanical strengthening device can be adopted to treat the surface of the workpiece to be strengthened at low temperature; fig. 3 is a schematic structural diagram of a low-temperature mechanical strengthening device for metal surface layer by roll strengthening, and in an actual operation process, strengthening treatment can be performed on the surface of a workpiece by using strengthening treatment processes such as laser shock and shot blasting; when the surface of the workpiece is strengthened by adopting strengthening treatment processes such as laser shock, shot blasting and the like, the structure of the metal surface layer low-temperature mechanical strengthening device illustrated in fig. 3 can be adaptively adjusted according to actual needs to complete the strengthening treatment process; the metal surface layer low-temperature mechanical strengthening device can comprise a fixed support 11, a low-temperature medium container, a low-temperature medium conveying pipe 5, a spraying ring 6, a plurality of nozzles 7, a strengthening treatment mechanism and a workpiece clamping mechanism 12; the metal surface layer low-temperature mechanical strengthening device can adopt a numerical control machine structure; the fixed bracket 11 is used for supporting the spray ring 6 and the strengthening treatment mechanism; the low-temperature medium container is used for storing low-temperature medium, and the low-temperature medium refers to an indirect substance used for providing a low-temperature environment lower than room temperature, such as: liquid ammonia, supercritical carbon dioxide, liquid nitrogen + alcohol, liquid oxygen, liquid nitrogen, liquid neon, liquid hydrogen, liquid helium and the like; the low-temperature medium conveying pipe 5 is connected between the low-temperature medium container and the spray ring 6 and is used for conveying the low-temperature medium stored in the low-temperature medium container to an internal flow channel of the spray ring 6; the spray ring 6 is arranged on the outer periphery side of the workpiece; the spray ring 6 may be an annular tubular member provided with an internal flow passage and provided at an inner peripheral side with a plurality of outlets communicating with the internal flow passage; a nozzle 7 for spraying a low-temperature medium is detachably mounted at each outlet; the nozzle 7 is detachably arranged on the spray ring 6, is communicated with an internal flow passage of the spray ring 6 and is used for spraying a low-temperature medium to the surface of a workpiece; the arrangement of the nozzles 7 is mainly determined according to the type of shape of the piece to be machined, such as: rolling the surface layer of the shaft part at low temperature, sleeving the spraying ring 6 on the outer peripheral side of the part, and uniformly arranging a plurality of nozzles 7 along the circumferential direction; the strengthening treatment mechanism is used for strengthening the surface of the workpiece, and when the workpiece is strengthened by adopting a rolling strengthening process, the strengthening treatment mechanism can comprise a tool rest 10 arranged on a fixed bracket 11 and a rolling cutter 9 arranged on the tool rest 10; similarly, when the shot peening or laser shock peening process is adopted, the peening mechanism comprises parts required by shot peening or laser shock peening; the workpiece holding mechanism 12 is used to hold a workpiece, and the workpiece holding mechanism 12 may be a chuck. The fixed support 11 may include a bed and a slide of a numerically controlled machine tool, i.e., the fixed support 11 is formed by the bed and the slide of the numerically controlled machine tool; the spray ring 6 and the strengthening treatment mechanism are both fixedly arranged on the sliding table; the workpiece clamping mechanism 12 is fixedly mounted on the bed. The sliding table slides along the lathe bed, the nozzle 7 and the strengthening treatment mechanism can be controlled to move along the lathe bed, so that the nozzle 7 and the strengthening treatment mechanism can move relative to a workpiece, the nozzle 7 can carry out all-dimensional low-temperature treatment on the workpiece, the strengthening treatment mechanism can carry out all-dimensional strengthening treatment on the workpiece, and the automatic low-temperature strengthening treatment can be realized by controlling the movement of the sliding table.
By adopting the metal surface layer low-temperature mechanical strengthening device, the workpiece can be subjected to low-temperature treatment by the low-temperature medium sprayed to the surface of the workpiece, meanwhile, the workpiece clamping mechanism 12 clamps or fixes the workpiece, and the strengthening treatment mechanism is adopted to realize low-temperature strengthening treatment under the environment of keeping the workpiece at low temperature.
In the method for low-temperature mechanical strengthening of a metal surface layer, as shown in fig. 1, before the low-temperature treatment of the surface of the workpiece to be strengthened, the method further includes: in step S10, the metal surface layer low-temperature mechanical strengthening device is installed, the spray ring 6 is fitted around the outer periphery of the workpiece, the outlet of the nozzle 7 is directed to the surface of the workpiece, and the position and number of the nozzles 7 are set according to the shape of the workpiece.
The low-temperature mechanical strengthening device for the metal surface layer is arranged, so that the low-temperature strengthening treatment of the workpiece can be conveniently carried out, meanwhile, the adaptability can be adjusted according to different workpieces, and the adaptability and the application range of the low-temperature strengthening treatment process are expanded.
In order to conveniently control the flow, the speed and the action time of the low-temperature medium, the metal surface layer low-temperature mechanical strengthening device can further comprise a flow meter and a control valve which are arranged on the low-temperature medium conveying pipe 5, and the control valve can be a manual control valve or an automatic control valve.
The method for performing low-temperature strengthening on the surface layer material of the magnesium alloy ZK61M by adopting liquid nitrogen spraying and rolling strengthening technology is described as an example:
firstly, installing a metal surface layer low-temperature mechanical strengthening device, wherein as shown in fig. 3, the metal surface layer low-temperature mechanical strengthening device comprises a low-temperature medium conveying pipe 5, a spraying ring 6, a detachable nozzle 7, a rolling cutter 9, a cutter rest 10 and a fixing support 11;
secondly, clamping the magnesium alloy ZK61M bar with the diameter of 110mm on a chuck of a numerical control machine tool, setting the number of nozzles 7 to be 5, setting the spraying angle to be 45 degrees, and setting the distance between the nozzles 7 and the workpiece to be 6 mm; controlling the flow of liquid nitrogen to be 1L/min, and obtaining the liquid nitrogen temperature at the nozzle 7 to be-195 ℃;
and finally, adjusting parameters to run a processing program, enabling the workpiece to start rotating, starting a metal surface layer low-temperature mechanical strengthening device, precooling the workpiece for a period of time, and then performing rolling processing, wherein a rolling cutter 9 applies a radial load to the workpiece, and the load direction of the radial load always points to the center of the workpiece. Along with the operation of a machining program, the tool rest 10 is pushed to the axial direction of a workpiece, the ball of the rolling cutter 9 extrudes the surface of the workpiece to feed along the axial direction, the spray ring 6 is continuously close to the surface to be machined along the axial direction along with the feeding of the cutter and is accurately sprayed to a rolling area, materials are removed while cooling is achieved, and the purpose of low-temperature rolling strengthening of a metal surface layer is achieved.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A low-temperature mechanical strengthening method for a metal surface layer is characterized by comprising the following steps:
carrying out low-temperature treatment on the surface of a workpiece to be subjected to strengthening treatment to form a cooling layer on the surface of the workpiece;
the surface of the workpiece is strengthened while maintaining the low-temperature treatment of the surface of the workpiece.
2. The method for low-temperature mechanical strengthening of a metal surface layer according to claim 1, wherein a low-temperature treatment is performed on the surface of a workpiece to be strengthened by using a metal surface layer low-temperature mechanical strengthening device;
the metal surface layer low-temperature mechanical strengthening device comprises a fixed support, a low-temperature medium container, a low-temperature medium conveying pipe, a spraying ring, a plurality of nozzles, a strengthening treatment mechanism and a workpiece clamping mechanism;
the fixed bracket is used for supporting the spray ring and the strengthening treatment mechanism;
the low-temperature medium container is used for storing low-temperature medium;
the low-temperature medium conveying pipe is connected between the low-temperature medium container and the spray ring and is used for conveying the low-temperature medium stored in the low-temperature medium container to the internal flow passage of the spray ring;
the spray ring is arranged on the outer peripheral side of the workpiece;
the nozzle is detachably arranged on the spray ring, is communicated with an internal flow passage of the spray ring and is used for spraying a low-temperature medium to the surface of a workpiece;
the strengthening treatment mechanism is used for strengthening treatment on the surface of the workpiece;
the workpiece clamping mechanism is used for clamping a workpiece.
3. The method of low temperature mechanical strengthening of a metal skin of claim 2, further comprising, prior to the low temperature treatment of the surface of the workpiece to be strengthened:
installing the metal surface layer low-temperature mechanical strengthening device, sleeving the spray ring on the outer peripheral side of the workpiece, enabling the outlet of the nozzle to face the surface of the workpiece, and setting the position and the number of the nozzles according to the shape of the workpiece.
4. The metal skin cryogenic mechanical strengthening method of claim 3, wherein the metal skin cryogenic mechanical strengthening device further comprises a flow meter and a control valve mounted to the cryogenic media transfer pipe.
5. The method of low-temperature mechanical strengthening of a metal surface layer according to claim 4, wherein when the work is strengthened while maintaining the low-temperature treatment, the strengthening treatment process employs roll strengthening, shot peening, or laser shock strengthening.
6. The method of low temperature mechanical strengthening of metal skins of claim 5, wherein said strengthening mechanism comprises a tool holder mounted to said fixture and a rolling tool mounted to said tool holder.
7. The method for low temperature mechanical strengthening of a metal surface layer according to claim 6, wherein the fixed support comprises a bed and a slide of a numerically controlled machine; the spraying ring and the strengthening treatment mechanism are both fixedly arranged on the sliding table;
the workpiece clamping mechanism is a chuck and is fixedly arranged on the lathe bed.
8. A metal surface layer low-temperature mechanical strengthening device for executing a metal surface layer low-temperature mechanical strengthening method is characterized by comprising a fixed support, a low-temperature medium container, a low-temperature medium conveying pipe, a spraying ring, a plurality of nozzles, a strengthening treatment mechanism and a workpiece clamping mechanism;
the fixed bracket is used for supporting the spray ring and the strengthening treatment mechanism;
the low-temperature medium container is used for storing low-temperature medium;
the low-temperature medium conveying pipe is connected between the low-temperature medium container and the spray ring and is used for conveying the low-temperature medium stored in the low-temperature medium container to the internal flow passage of the spray ring;
the spray ring is an annular tubular part, is provided with an internal flow passage, and is provided with a plurality of outlets communicated with the internal flow passage on the inner peripheral side;
each outlet is detachably provided with one nozzle, and the nozzles are used for spraying low-temperature medium;
the strengthening treatment mechanism is used for strengthening treatment on the surface of the workpiece;
the workpiece clamping mechanism is used for clamping a workpiece.
9. The metal skin cryogenic mechanical strengthening device of claim 8, wherein the fixed support comprises a bed and a slide of a numerically controlled machine; the spraying ring and the strengthening treatment mechanism are both fixedly arranged on the sliding table;
the workpiece clamping mechanism is a chuck and is fixedly arranged on the lathe bed.
10. The metal skin cryogenic mechanical strengthening device of claim 9, wherein the strengthening treatment mechanism comprises a tool holder mounted to the fixed support and a rolling tool mounted to the tool holder;
the low-temperature medium is liquid nitrogen or supercritical carbon dioxide.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114807553A (en) * | 2022-03-30 | 2022-07-29 | 新疆大学 | Ultra-low temperature rolling impression strengthening method and device for surface of austenitic stainless steel plate |
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| CN1732274A (en) * | 2002-12-25 | 2006-02-08 | 新东工业株式会社 | Method of refining metal surface and metal product by the method |
| CN109182725A (en) * | 2018-08-23 | 2019-01-11 | 华中科技大学 | A kind of laser shock peening method based on liquid nitrogen restraint layer |
| CN211889699U (en) * | 2020-03-18 | 2020-11-10 | 济南大学 | Low-temperature rolling device for shaft workpieces |
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2021
- 2021-03-23 CN CN202110307653.4A patent/CN113106221A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1732274A (en) * | 2002-12-25 | 2006-02-08 | 新东工业株式会社 | Method of refining metal surface and metal product by the method |
| CN109182725A (en) * | 2018-08-23 | 2019-01-11 | 华中科技大学 | A kind of laser shock peening method based on liquid nitrogen restraint layer |
| CN211889699U (en) * | 2020-03-18 | 2020-11-10 | 济南大学 | Low-temperature rolling device for shaft workpieces |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114807553A (en) * | 2022-03-30 | 2022-07-29 | 新疆大学 | Ultra-low temperature rolling impression strengthening method and device for surface of austenitic stainless steel plate |
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