Heat flow pulse type ring residual stress homogenization method and device
阅读说明：本技术 一种热流脉冲式环件残余应力均化方法与装置 (Heat flow pulse type ring residual stress homogenization method and device ) 是由 吴琼 薛念普 高瀚君 张以都 于 2020-06-24 设计创作，主要内容包括：本发明提出一种热流脉冲式环件残余应力均化方法,对具有一定压力值的液压油进行加热,实现热流脉冲式复合残余应力均化,设计了一种适用于热流脉冲式环件残余应力均化的装置,具体包括机械模具系统和液压与控制系统。热流脉冲式环件残余应力均化方法,设定输出液压值为周期波动的脉冲液压,并对输出液压油进行加热,实现对零件加载热流温度、液压力、液压脉冲压力的多重载荷作用,利用外力加载进行残余应力的均化。热流脉冲式环件残余应力均化装置,包括机械模具系统和液压与控制系统,机械模具主要作用是实现零件的装夹固定,液压与控制系统进行载荷的输出与控制。与现有技术相比,本发明显著优点有：1)可以实现热流温度、液压力、液压脉冲力多重载荷作用下的残余应力均化；2)能够进行环件径向、轴向与周向三个方向的残余应力均化；3)液压油通过耐温气囊作用于零件上,减少了液体泄漏；4)可以到达高度自动化,进行工艺参数的准确控制；5)残余应力均化效率高,设备成本低,避免了机械式胀形模具交界面的应力差。(The invention provides a residual stress homogenization method of a heat flow pulse type ring piece, which is used for heating hydraulic oil with a certain pressure value to realize heat flow pulse type composite residual stress homogenization and designs a device suitable for the residual stress homogenization of the heat flow pulse type ring piece, and the device specifically comprises a mechanical die system and a hydraulic and control system. The method for homogenizing the residual stress of the heat flow pulse type ring piece is characterized in that an output hydraulic value is set to be pulse hydraulic pressure with periodic fluctuation, the output hydraulic oil is heated, multiple load effects of heat flow temperature, hydraulic pressure and hydraulic pulse pressure loaded on parts are achieved, and the residual stress is homogenized by means of external force loading. The heat flow pulse type ring residual stress homogenizing device comprises a mechanical die system and a hydraulic and control system, wherein the mechanical die system is mainly used for clamping and fixing parts, and the hydraulic and control system is used for outputting and controlling loads. Compared with the prior art, the invention has the following remarkable advantages: 1) the residual stress homogenization under the action of multiple loads of heat flow temperature, hydraulic pressure and hydraulic pulse force can be realized; 2) the residual stress homogenization in the radial direction, the axial direction and the circumferential direction of the ring piece can be carried out; 3) hydraulic oil acts on parts through the temperature-resistant air bag, so that liquid leakage is reduced; 4) the method can achieve high automation and accurately control the process parameters; 5) the residual stress homogenization efficiency is high, the equipment cost is low, and the stress difference of the mechanical bulging die interface is avoided.)
1. A flow pulse type ring residual stress homogenizing method sets an output hydraulic pressure value as a pulse hydraulic pressure with periodic fluctuation, heats output hydraulic oil, achieves multiple loading effects of loading heat flow temperature, hydraulic pressure and hydraulic pulse dynamic loading force on parts, and achieves homogenizing of residual stress through external force loading.
2. The utility model provides a heat flow pulsed ring residual stress homogenization device, includes mechanical die system and hydraulic pressure and control system, and the mechanical die mainly functions realizes the clamping of part and fixes, and hydraulic pressure and control system carry out the output and the control of load. The mechanical die system consists of a supporting inner wall (4), a supporting rod (5), a fastening screw (6) and a core die (7). The hydraulic and control system consists of an integrated hydraulic oil tank (1), a heating device (2), an input oil pipe (3), a temperature-resistant air bag (8), an output oil pipe (10) and a cooling device (11).
3. The flow impulse type ring residual stress homogenizing method as claimed in claim 1, characterized in that in the process, a pulse hydraulic pressure with a certain pressure value is loaded, and the hydraulic oil is heated to form a heat flow pulse hydraulic load loaded on the part, and the heat flow pulse hydraulic load is maintained for a certain time, so that the homogenizing and the reduction of the residual stress in the material are realized. The technological process relates to technological parameters such as an average hydraulic value P, a pulse hydraulic range delta P, an upper critical hydraulic value P plus or minus (delta P/2), a pulse period T, a pressure rise time T1, a pressure maintaining time T2, a hydraulic temperature W and the like.
Technical Field
The invention relates to a residual stress homogenizing method and device for a heat flow pulse type ring piece, and belongs to the field of processing and manufacturing and residual stress control.
Background
Residual stress is the result of a non-uniform elastic or elastoplastic deformation of a material, which is linked to the residual elastic strain present in localized areas of the material. Residual stress has a great influence on the strength, fatigue life, stress corrosion resistance and structural dimensional stability of a metal workpiece. When the object is acted by external force, the acting stress and the residual stress are interacted, so that some parts of the object are in plastic deformation, and the internal stress of the section is redistributed; when the external force is removed, the whole object will deform due to the effect that the internal residual stress tends to be balanced. Therefore, the parts need to be subjected to a residual stress homogenization process as required, and the main homogenization methods include a heat aging method, a vibration aging method, a cold burying method, a bulging method, a heat vibration composite method, and the like. The thermal aging is to utilize the temperature change in the three processes of temperature rise, heat preservation and temperature reduction to rapidly expand and contract the parts and reduce the yield limit of the material, the place with high residual stress can exceed the yield limit, the crystal lattice slides and generates tiny plastic deformation, thereby releasing, reducing and homogenizing the residual stress. The vibration aging is to apply periodic acting force dynamic stress to the material, so that the superposition of the dynamic stress of the component and the internal residual stress is larger than the yield limit of the material, the crystal lattice slides, and tiny plastic deformation is generated, thereby achieving the purpose of releasing the residual stress. The thermal vibration composite residual stress homogenization is to apply a circulating dynamic load to the aging part under a certain temperature condition, and realize the positioning relaxation, reduction and homogenization of the residual stress in the aging part by the composition of thermal and vibration aging. However, the above residual stress homogenization methods all have defects, the thermal aging mode has a long process period, and the requirements on fields and equipment are high; vibratory stress aging does not provide sufficient dynamic stress for large parts.
Disclosure of Invention
Based on the background, the invention provides a residual stress homogenization method for a heat flow pulse type ring piece, which is used for heating hydraulic oil with a certain pressure value to realize heat flow pulse type composite residual stress homogenization and designs a device suitable for the residual stress homogenization of the heat flow pulse type ring piece, and the device specifically comprises a mechanical die system and a hydraulic and control system. The method for homogenizing the residual stress of the heat flow pulse type ring piece is characterized in that an output hydraulic value is set to be pulse hydraulic pressure with periodic fluctuation, the output hydraulic oil is heated, multiple load effects of heat flow temperature, hydraulic pressure and hydraulic pulse pressure loaded on parts are achieved, and the residual stress is homogenized by means of external force loading. The heat flow pulse type ring residual stress homogenizing device comprises a mechanical die system and a hydraulic and control system, wherein the mechanical die system is mainly used for clamping and fixing parts, and the hydraulic and control system is used for outputting and controlling loads.
The heat flow pulse type ring residual stress homogenization method comprises the process as shown in figure 1. In the process, pulse hydraulic pressure with a certain pressure value is loaded, hydraulic oil is heated to form heat flow pulse hydraulic load loaded on the part, the heat flow pulse hydraulic load is maintained for a certain time, and homogenization and reduction of residual stress in the material are realized. The technological process relates to technological parameters such as an average hydraulic value P, a pulse hydraulic range delta P, an upper critical hydraulic value P plus or minus (delta P/2), a pulse period T, a pressure rise time T1, a pressure maintaining time T2, a hydraulic temperature W and the like.
The residual stress homogenizing device of the heat flow pulse type ring is shown in figure 2. The mechanical die system consists of a supporting
The invention has the beneficial effects that:
1. the residual stress homogenization under the action of multiple loads of heat flow temperature, hydraulic pressure and hydraulic pulse force can be realized.
2. The method can be used for homogenizing the residual stress of the ring piece in the radial direction, the axial direction and the circumferential direction.
3. The hydraulic oil acts on the parts through the temperature-resistant air bag, so that liquid leakage is reduced.
4. Can reach high automation and accurately control the technological parameters.
5. The residual stress homogenization efficiency is high, the equipment cost is low, and the stress difference of the mechanical bulging die interface is avoided.
Drawings
FIG. 1 is a schematic process diagram of a heat flow pulse type ring residual stress homogenization method
FIG. 2 is a schematic diagram of a residual stress homogenizing device of a heat flow pulse type ring
In the figure, 1 is an integrated hydraulic oil tank, 2 is a heating device, 3 is an input oil pipe, 4 is a supporting inner wall, 5 is a supporting rod, 6 is a fastening screw, 7 is a core die, 8 is a temperature-resistant air bag, 9 is a workpiece, 10 is an output oil pipe, and 11 is a cooling device.
FIG. 3 is a schematic view of clamping of residual stress homogenizing parts of heat flow pulse type ring
In the figure, 1 is an integrated hydraulic oil tank, 2 is a cooling/heating device, 3 is an output/input oil pipe, 4 is a supporting inner wall, 5 is a temperature-resistant air bag, and 6 is a workpiece.
FIG. 4 is a schematic view of a heat flow impulse type ring residual stress homogenizing mechanical die
In the figure, 1 is an output oil pipe, 2 is a supporting inner wall, 3 is a supporting rod, 4 is a fastening screw, 5 is a core mold, 6 is a workpiece, and 7 is an output oil pipe.
FIG. 5 is a schematic cross-sectional view of a heat flow pulse type ring residual stress homogenizing device
In the figure, 1 is a temperature-resistant air bag, 2 is a support rod, 3 is a core mold, 4 is a fastening screw, 5 is a support inner wall, 6 is a workpiece, and 7 is an input oil pipe.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
Based on the background, the invention provides a residual stress homogenization method for a heat flow pulse type ring piece, which is used for heating hydraulic oil with a certain pressure value to realize heat flow pulse type composite residual stress homogenization and designs a device suitable for the residual stress homogenization of the heat flow pulse type ring piece, and the device specifically comprises a mechanical die system and a hydraulic and control system. The method for homogenizing the residual stress of the heat flow pulse type ring piece is characterized in that an output hydraulic value is set to be pulse hydraulic pressure with periodic fluctuation, the output hydraulic oil is heated, multiple load effects of heat flow temperature, hydraulic pressure and hydraulic pulse pressure loaded on parts are achieved, and the residual stress is homogenized by means of external force loading. The heat flow pulse type ring residual stress homogenizing device comprises a mechanical die system and a hydraulic and control system, wherein the mechanical die system is mainly used for clamping and fixing parts, and the hydraulic and control system is used for outputting and controlling loads.
As shown in fig. 1, the process of the heat flow pulse type ring residual stress homogenization method is shown in a schematic diagram. In the process, pulse hydraulic pressure with a certain pressure value is loaded, hydraulic oil is heated to form heat flow pulse hydraulic load loaded on the part, the heat flow pulse hydraulic load is maintained for a certain time, and homogenization and reduction of residual stress in the material are realized. The technological process relates to technological parameters such as an average hydraulic value P, a pulse hydraulic range delta P, an upper critical hydraulic value P plus or minus (delta P/2), a pulse period T, a pressure rise time T1, a pressure maintaining time T2, a hydraulic temperature W and the like. The increase rate of the hydraulic pressure is controlled by setting the pressure rise time t1, the hydraulic temperature W controls the heat flow temperature of the hydraulic oil, the pulse hydraulic range delta P controls the hydraulic pulse dynamic load, and the average hydraulic value P determines the hydraulic pressure load. Can reach high automation and accurately control the technological parameters.
As shown in fig. 2, the heat flow pulse type ring residual stress homogenizing device is shown schematically. The mechanical die system consists of a supporting
As shown in FIG. 3, the clamping schematic diagram of the residual stress homogenizing part of the heat flow pulse type ring is shown. The
As shown in fig. 4, a schematic view of a heat flow pulsed ring residual stress homogenization mechanical die. The temperature-resistant air bag is rapidly expanded under the action of thermal flow load, in order to avoid the expansion of the air bag to the inner side of the ring piece, the supporting
As shown in fig. 5, the sectional view of the residual stress homogenizing device of the heat flow pulse type ring is schematic. The
The embodiments described above are only preferred embodiments of the invention and are not exhaustive of the possible implementations of the invention. The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It will be appreciated by those skilled in the art that changes in this embodiment may be made without departing from the principles and spirit of the invention, and that such changes and modifications are to be considered as within the scope of the appended claims.
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