35results about How to "Reduce internal residual stress" patented technology

The invention provides a strain gauge which is quick to mount, high in test accuracy, high in resistance to heat and humidity, high in stability and suitable for stress strain test of medium-sized and large-sized metal components, and methods for manufacturing and mounting the strain gauge. The strain gauge comprises a metal base body, an adhesive layer, a resistance strain gauge, a moisture-proof layer, a signal lead and a protective layer, wherein the resistance strain gauge is fixedly mounted on the metal base body by virtue of the adhesive layer; the signal lead is electrically connected with a bonding pad of the resistance strain gauge and is led out; the moisture-proof layer coats the surface of the resistance strain gauge; the protective layer coats the surface of the moisture-proof layer. The manufacturing method comprises the following steps: (a) adhering the resistance strain gauge to the metal base body by virtue of an adhesive; (b) leading the signal lead out of the bonding pad of the resistance strain gauge; (c) forming the moisture-proof layer on the surface of the resistance strain gauge by virtue of a moisture-proof adhesive, wherein the coverage area of the moisture-proof layer is greater than that of the resistance strain gauge; (d) forming the protective layer on the surface of the moisture-proof layer by virtue of a protective adhesive, wherein the coverage area of the protective layer is greater than that of the moisture-proof layer. During mounting, the strain gauge is fused and welded on a measured metal component by virtue of spot welding equipment.

The invention discloses and relates to the technical field of metal heat treatment and particularly relates to a pearlite steel rail production treatment method and a lifting steel lifting and shifting machine thereof. The method comprises the followings steps that a, rolled pearlite steel rails are placed on a lifting steel lifting and shifting machine; b, during conveying of the pearlite steel rails, the lifting steel lifting and shifting machine applies acting force on the steel rails, so that S-shaped bending deformation or circular-arc bending deformation of the pearlite steel rails in the horizontal plane is achieved; c, the pearlite steel rails are conveyed to an inlet of a heat treatment unit; and d, the pearlite steel rails are fed into the heat treatment unit, and a cooling device is arranged in the heat treatment unit and used for cooling the pearlite steel rails in an accelerated mode. The strength and tenacity of the steel rails can be improved through bending deformation,an accelerated cooling medium is applied to the pearlite steel rails through the cooling device, the comprehensive performance of the steel rails is improved, the fatigue damage probability of the pearlite steel rails is lowered, and the overall service lives of the steel rails are prolonged.

The invention provides a heat treatment method and device for reducing internal residual stress of a GH4096 alloy disc ring forging, the device includes a platform base (1), a slewing support (2), a rotary table (3), a reducer (5), a motor (6 ), fan (7), fan support (8), control panel (9), spraying device (11). It can improve the uniformity of the workpiece cooling process, ensure the consistency of the process, and make the performance of the workpiece after heat treatment more stable and the residual stress lower.

The invention discloses an ultrasonic-assisted powder forming method in a fluid environment. Firstly, the powder particles are formed under the action of hydrostatic pressure, so that the density of the powder compact reaches about 80% of its theoretical density, and the hydrostatic pressure is kept applied and introduced Ultrasonic power makes the powder compact further compacted and stress homogenized under the action of ultrasonic vibration. The present invention improves the fluidity and filling performance of powder particles by introducing power ultrasound into the hydrostatic pressure forming process of powder particles, reduces the pressure required for compaction, and can improve the density distribution uniformity of the formed compact at the same time, thereby reducing the powder density. The residual stress of the body compact increases its mechanical properties. At the same time, the viscosity of the fluid medium can be significantly reduced and the fluidity of the fluid medium can be improved by using the mechanical vibration generated when the ultrasonic wave propagates in the oil medium, the ultrasonic cavitation effect, and the thermal effect generated by the medium absorbing the sound wave.

The invention discloses a dynamic pressurized tempering furnace for tempering a saw blade matrix. The dynamic pressurized tempering furnace comprises a furnace body (1), a heating device (2) and a bearing platform (3), wherein the heating device (2) and the bearing platform (3) are both arranged in the furnace body (1); the inner wall of the furnace body (1) is provided with a fire protection layer (4); an oil cylinder (6) is vertical to the top of the furnace body (1) and is arranged in the furnace body (1); the bottom of a piston rod of the oil cylinder (6) is provided with a spherical boss (8); a pressure head (7) is internally provided with a spherical groove (9). The dynamic pressurized tempering furnace also comprises a controller, a display (10) and a temperature sensor (11), wherein the controller is connected with the oil cylinder (6) and the heating device (2). The dynamic pressurized tempering furnace is compact in structure, capable of automatically regulating the angle of the pressure head according to the planeness of a saw blade and convenient for workers to operate. After being subjected to thermal treatment by the dynamic pressurized tempering furnace, the saw blade matrix is uniform in crystalline phase tissue, small in internal residual stress and low in saw blade planeness less than 0.03mm.

The invention proposes a process parameter optimization method for eliminating the residual stress of a ring by a cold rolling method. According to the initial residual stress distribution state of the workpiece, based on the mechanical and kinematic conditions of ring rolling, combined with the final size and mechanical performance requirements of the ring, and considering the capability of the ring rolling process equipment, the residual stress reduction rate and distribution uniformity are taken as Controlling the optimization objective, taking the reduction rate, driving roll speed, friction coefficient, core roll radius and core roll feed speed as the constraints, a comprehensive optimization setting method for the process parameters of the cold rolling method to eliminate the residual stress of the ring is given , the present invention can systematically and comprehensively evaluate the effect of stress relief, formulate process parameters scientifically, efficiently and accurately, and carry out targeted cold rolling to eliminate residual stress on ring parts, greatly improving the effect of residual stress control, Give full play to the technical advantages of cold rolling method to eliminate residual stress of ring parts.

The invention discloses a double-bracing vertical type straightening machine. The double-bracing vertical type straightening machine comprises a drive side rack, a roll collar assembly, an axial adjusting device and a locking device. The double-bracing vertical type straightening machine further comprises an operation side rack and an operation side sliding seat, wherein the operation side sliding seat is fixedly arranged. The lower end of the roll collar assembly is arranged on the drive side rack, the upper end of the roll collar assembly is arranged on the operation side rack, and the operation side rack is arranged on the operation side sliding seat and is matched with the operation side sliding seat along a horizontal line in a sliding mode. The double-bracing vertical type straightening machine further comprises a roller-replacing hydraulic cylinder connected with the operation side rack. According to the double-bracing vertical type straightening machine, the upper end of the roll collar assembly and the lower end of the roll collar assembly are both supported by the racks, a simple-supporting structure is formed to enable the roll collar assembly and the rack to be better in rigidity, the roll collar assembly and the rack are not prone to deforming during a straightening process, the quality of a straightened product can be effectively improved, and internal residual stress of the product can be reduced. When rollers are replaced, the operation side rack can be moved away from the upper end of the roll collar assembly integrally through the roller-replacing hydraulic cylinder, the roller-replacing operation is simple, roller-replacing time is short, and production efficiency and equipment utilization rate can be improved.

The present invention relates to a SiC f / SiC core cladding tube ports CaO‑MgO‑Al 2 o 3 ‑SiO2 2 The glass encapsulation method selects some raw materials with low reactivity, small nuclear radiation decay rate, and no side effects on the nuclear reaction process, and prepares them into glass solder by melting-water cooling method, relying on the fluidity of the glass itself and the SiC f Wetting of / SiC composite materials, realize SiC under the applicable temperature of domestic third-generation SiC fibers (≤1450°C) and under pressure-free conditions f / Encapsulation / joining of SiC composite core cladding tubes. Beneficial effects: the encapsulation / connecting agent raw material is selected from low-activity elements, its nuclear radiation decay rate is small, and it has no side effects on the nuclear reaction process, and can meet the harsh nuclear environment. CMAS glass is selected as the packaging / connecting agent, whose thermal expansion coefficient matches that of SiC / SiC, which can effectively prevent interface cracking caused by thermal mismatch and reduce internal residual stress. In addition, its packaging / connection conditions meet domestic SiC f / SiC composite material requirements.

The invention discloses an ecologic plate oven and an operation method thereof. The ecologic plate oven comprises an oven body, wherein a door is arranged on one side surface; a bracket for placing an ecologic plate, a separation plate and a temperature measuring device arranged in the oven body; gaps for communicating with upper and lower layers of the oven body are arranged at the two ends of the separation plate; a heating device 1 is arranged on the upper layer; an air outlet is formed in the top of the heating device 1, and is connected with an air inlet of an exhaust fan; an air outlet of the exhaust fan is connected to the bottom in the oven body; and the temperature measuring device is connected with a digital display device. The ecologic plate is put in the oven for baking; the baking temperature can be known by the temperature measuring device; the temperature in the oven body reaches an uniform temperature state through the heating device for circularly flowing a hot air flow; the baked ecologic plate can reduce the internal residual stress; the water content is more uniform; the baking effect is good; the service life of the ecologic plate is prolonged; the oven is wholly manufactured by using a molded steel structure as a support, is light in weight, and is easy to be manufactured and carried; and the oven has the characteristics of simple structure, low cost and convenient and simple baking method.