125 results about "Stress relieving" patented technology

The invention relates to the field of metal surface treatment, and discloses a multi-layer vacuum coating method for enhancing the surface of a high-precision metal part, which comprises the following steps: S1, surface treatment: removing surface pollutants and oxide layers through plasma cleaning, and coarsening the surface of a base material through laser etching; s2, coating deposition is conducted, specifically, a metal transition layer and a multi-layer nano hard coating are deposited in an enhanced mode through plasma; s3, depositing a self-lubricating coating: depositing the self-lubricating coating by pulse laser; s4, post-treatment: carrying out ion beam assisted post-treatment; s5, heat treatment: performing low-temperature heat treatment to eliminate stress. Through the plasma enhanced PVD and pulse laser deposition technology, the multi-layer nano coating is deposited under the low-temperature condition, the problem of thermal deformation of a heat-sensitive metal base material caused by a traditional high-temperature process is solved, and it is ensured that the multi-layer coating with high hardness and high compactness can still be formed on the premise that the size precision of the base material is not affected; and therefore, the method can be widely applied to surface treatment of high-precision parts.

The invention relates to a method and a device for eliminating stress of a metal thin strip in heat treatment, which are characterized in that: 1) a large-tension metal thin strip conveying mechanism is arranged in a heat treatment furnace of the metal thin strip, and the metal thin strip conveying mechanism keeps tension of 3-6 tons in a workpiece conveying process; and (2) the tension borne by the workpiece is kept to be 3-6 tons through a tension control mechanism of the large-tension metal thin strip conveying mechanism, so that the internal stress of the workpiece disappears in the conveying process, namely the tension borne by the workpiece in the conveying process is kept to be constant to be 3-6 tons, and the internal stress of the workpiece is eliminated when the workpiece passes through the process section of the heat treatment furnace. The large-tension metal thin strip conveying mechanism comprises an unwinding mechanism, a winding mechanism and a tension control mechanism, and the tension between the unwinding mechanism and the winding mechanism is controlled to be 3-6 tons constantly through the tension control mechanism, so that a large-tension control structure is formed. The device has the characteristics of simple structure, low cost, good stress eliminating effect and the like, and prevents the copper strip from vibrating and the workpiece from deforming.

The invention relates to a method for eliminating residual stress in additive manufacturing of nickel-based superalloy, and relates to the technical field of additive manufacturing materials. According to the main technical scheme, stress relief treatment is carried out in the mode that continuous pulse current treatment is applied to the additive manufacturing nickel-based superalloy, so that at least part of residual stress in the additive manufacturing nickel-based superalloy is eliminated, and the additive manufacturing nickel-based superalloy subjected to stress relief treatment is obtained. According to the method, the residual stress in the additive manufacturing nickel-based superalloy can be effectively reduced. According to the method, the internal structure state of the original alloy is not changed, meanwhile, the method is low in treatment temperature, short in treatment time, more efficient and more energy-saving, and the requirement for green and sustainable development of the current industry is met.

The utility model discloses a non-ferrous metal rolled copper strip stress relieving device which comprises a machining table, an electromagnetic heater is fixedly installed on the upper end face of the machining table through an installation groove, a telescopic groove is formed in the upper end face of the machining table, and a toothed plate is fixedly connected to the inner bottom wall of the telescopic groove through an elastic mechanism. A supporting plate is fixedly installed on the upper end face of the machining table, a moving frame is fixedly connected to the bottom wall of the supporting plate through a lifting mechanism, a reciprocating lead screw is rotatably installed in the moving frame, and a motor connected with the reciprocating lead screw is fixedly installed on the outer wall of the moving frame. By arranging the reciprocating lead screw, the lead screw sleeve, the lower pressing roller and the like, when the lower pressing roller extrudes a copper sheet, the reciprocating lead screw drives the lead screw sleeve to move through the cooperation of the limiting rod, and then the lead screw sleeve drives the lower pressing roller to move through the cooperation of the lower pressing frame, so that the lower pressing roller can roll the heated copper sheet; and deformation of the copper sheet caused by heating in the stress eliminating process is avoided.

The invention relates to 200-series stainless steel with high Cu content and a thin-strip continuous casting preparation method of the 200-series stainless steel. The 200-series stainless steel with the high Cu content comprises the following components in percentage by mass: 0.1-0.15% of C; 0.30% to 0.50% of Si; 14.0% to 15.0% of Cr; 9.0% to 10.0% of Mn; 1.0 to 2.0 percent of Ni; 0.10% to 0.20% of N; 0.2 to 1.0 percent of Cu; s < = 0.005%, P < = 0.020%; and the balance of iron and other inevitable impurity elements. The preparation method comprises the following steps: selecting the raw materials according to the design components, and smelting to obtain molten steel for casting; molten steel obtained through smelting is cast through double-roller thin-strip continuous casting, a stainless steel cast strip is obtained, the cast strip is subjected to pass hot rolling and then water quenching, and a thin strip is obtained; and carrying out heat preservation treatment on the obtained thin strip to eliminate stress, and then carrying out water quenching to obtain a product. The composition is reasonable in design, the process is simple and controllable, and the obtained product is excellent in performance, thinner in thickness and convenient for industrial application.

The invention relates to the technical field of copper material manufacturing and processing, in particular to a flat copper wire straightening device which comprises a workbench, supporting legs are fixed to the corners of the bottom face of the workbench, and the flat copper wire straightening device further comprises a feeding mechanism, a longitudinal straightening mechanism, a transverse straightening mechanism and a stress relieving mechanism which are sequentially installed on the top face of the workbench. The stress relieving mechanism comprises a box fixed to the workbench, a heat insulation plate is arranged in the middle of the box, an inlet and an outlet which are aligned are formed in the two ends of the box respectively, and the heat insulation plate is provided with a through groove. An oil cooler and a control module are mounted on the top surface of the box body; an infrared thermometer electrically connected with the control module is mounted on the side, close to the inlet, of the thermal insulation plate; a first stress relieving mechanism and a second stress relieving mechanism are arranged in the box body and form a cooling oil circulation loop. Through eddy current heating of the first stress relieving mechanism and flexible pressure maintaining cooling of the second stress relieving mechanism, the internal stress of the flat copper wire is eliminated, secondary springback is avoided, the straightness stability is improved, and the machining requirement of a high-precision motor winding is met.

The invention belongs to the technical field of cable twisting, and particularly relates to a conductor surface treatment device and method for cable manufacturing, and the conductor surface treatment device for cable manufacturing comprises a feeding mechanism, a destressing part, a cooling mechanism, a cooling mechanism, a storage mechanism, a diversion mechanism and a disturbance mechanism; the feeding mechanism comprises a carrying table, a supporting cylinder and a material guiding disc, a through hole for a wire to pass through is formed in the outer wall of the material guiding disc, and the material guiding disc is rotationally installed on the carrying table through the supporting cylinder. The destressing part is used for heating the wire; the cooling mechanism is used for cooling the heated wire; the storage mechanism comprises a storage box used for storing cooling liquid and a transfer box. The cooling mechanism comprises a heat exchange plate and an exhaust pipe, the heat exchange plate is fixedly mounted on the inner wall of the storage box, and the exhaust pipe is arranged on one side of the heat exchange plate; the flow guide mechanism comprises a control pump, a conveying pipe and a filter cover, and the transfer box is connected with the storage box through the conveying pipe; through cooperation of the structure, the cable production quality and efficiency are improved, and the equipment maintenance period is prolonged.

The invention relates to intelligent cutting equipment for metal plate manufacturing, which relates to the related field of metal processing, and comprises a rack and a support frame fixed on the rack, and further comprises a plurality of driven conveying rollers rotationally mounted on the rack, the two sides of the supporting frame are each rotationally provided with two driving conveying rollers used for conveying a metal plate body, the two driving conveying rollers are connected through a gear set, the cutting assembly is installed on the supporting frame, the metal plate body is cut through the cutting assembly, and the stress relieving assembly is installed on the supporting frame; the stress eliminating assembly is used for eliminating residual stress of the metal plate body, the cutting slag cleaning mechanism is installed on the supporting frame and located at the bottom of the metal plate body, and iron slag adhering to the cutting position when the metal plate body is cut is cleaned through the iron slag cleaning mechanism, so that follow-up secondary operation is avoided.

The invention discloses a preparation method of a high-strength corrosion-resistant copper alloy wire. The preparation method comprises the following steps: (1) preparing composite powder; (2) preparing pretreatment powder; (3) sensitization treatment and activation are carried out, surface chemical copper plating is carried out on the activated powder, and copper plating powder is obtained; (4) weighing copper powder, nickel powder, silicon powder and copper-plated powder, heating and melting, adding the copper-plated powder into the melt, casting and molding, heating to eliminate stress, cooling, and drawing into a copper alloy wire by using a wire drawing machine; and the copper alloy wire is subjected to heat preservation for 30 min at the temperature of 220 DEG C, then the temperature is increased to 300 DEG C, heat preservation aging is conducted for 3 h, furnace cooling is conducted to 200 DEG C or below after heat preservation is completed, then the copper alloy wire is taken out and subjected to air cooling to the normal temperature, and the high-strength corrosion-resistant copper alloy wire is obtained. The copper alloy casting prepared through the method has high tensile strength, and the prepared copper alloy wire is high in self-corrosion potential and shows good strength and corrosion resistance.

The application discloses a nickel-plated steel strip lead processing method and belongs to the technical field of metal material surface treatment. The method aims to solve the problems of poor plating layer adhesion, large internal stress and easy peeling of the existing nickel-plated steel strip lead. The process steps include: S1, steel strip oil removal treatment; S2, composite activation treatment: the oil-removed steel strip is immersed in a composite activation solution containing sodium citrate to remove the surface oxide layer and form an active adsorption film; S3, nickel plating: the activated steel strip is immersed in a sulfate plating solution containing saccharin and 1,4-butynediol as composite additives for electroplating to form a low-stress and high-density nickel plating layer; S4, post-treatment: cleaning and drying; S5, slitting and packaging. The application cooperates sodium citrate activation with a plating solution system containing stress relieving agents, significantly improves the adhesion between the substrate and the plating layer, reduces the internal stress of the plating layer, and the obtained product has no peeling and falling of the plating layer after repeated bending, low porosity and excellent comprehensive performance, and is particularly suitable for the manufacturing of high-performance electronic component leads.

A method for manufacturing a non-oriented electrical steel sheet includes a step of performing hot rolling on a steel material having a predetermined chemical composition, a step of performing first cold rolling, a step of performing process annealing, a step of performing second cold rolling, and a step of performing any one or both of final annealing and stress relief annealing. A final pass of finish rolling is performed in a temperature range equal to or higher than an Ar1 temperature, the steel sheet is held for 2 hours or less in a temperature range lower than an Ac1 temperature in the final annealing, and the steel sheet is held for 1200 sec or more in a temperature range equal to or higher than 600° C. and lower than the Ac1 temperature in the stress relief annealing.

The invention relates to the technical field of welding, and discloses a steel furniture frame welding device which comprises a welding table, a welding frame is fixed to the welding table, a welding assembly is arranged on the welding frame, first electric push rods are arranged on the two sides of the welding frame correspondingly, and piston rods of the first electric push rods are sleeved with first guide blocks; the first guide block is connected with an adjusting assembly, a first spring is connected between the first guide block and a piston rod of the first electric push rod, and a cross movable frame is installed on the adjusting assembly. During heat treatment, the welding seam can be uniformly heated, so that deformation, cracking or performance reduction of the workpiece is prevented, the dimensional stability and mechanical performance of the workpiece are improved, the stress relieving effect is improved, cooling can be conducted again through the air blowing spray head after stress relieving is completed, and welding slag and oxide on the welding seam can be conveniently cleaned through the cleaning assembly.

The utility model discloses a thermal aging destressing device for pipe fittings, which belongs to the technical field of thermal aging destressing for pipe fittings, and adopts the technical scheme that the thermal aging destressing device comprises a heating furnace and three furnace doors, the front side of the heating furnace is fixedly connected with a support frame, and the top of the support frame is provided with an adjusting mechanism and a fixing mechanism; the rear side of the heating furnace is fixedly communicated with a cooling frame; the adjusting mechanism comprises a first supporting plate, a first adjusting frame, two second supporting plates, six auxiliary pads, a second adjusting frame, six auxiliary columns and a third adjusting frame, and the problems that due to the fact that specifications of existing pipe fittings are different, temperature distribution in a heating furnace may be uneven during heating destressing, and if the cooling speed is too high, the temperature distribution is not uniform are solved. In the prior art, a large temperature gradient can be formed in the pipe fitting, then thermal stress is generated, and the newly generated stress may counteract residual stress eliminated by thermal aging treatment, and even causes the problems of deformation or cracking of the pipe fitting and the like.

The invention discloses a testing machine chuck used for a material deflection test and deflection test equipment. The testing machine chuck used for the material deflection test comprises a base, a clamping device and a clamping device, the clamping block is arranged on the base in a sliding mode, the clamping block comprises an arc-shaped lower clamping part which extends out of the base, and the clamping block eliminates stress concentration through the lower clamping part; and the driver is used for driving the clamping block to press the sample. The deflection test equipment comprises the testing machine chuck for the material deflection test. At the lower end of the joint of the sample and the clamping block, the testing machine chuck for the material deflection test adopts the arc-shaped lower clamping part to form an arc transition surface, so that stress concentration is avoided, and the problems of local damage, accelerated fatigue failure, brittleness increase, bearing capacity reduction and the like caused by the stress concentration are effectively improved; and the probability that the sample is pinched off is greatly reduced.

The invention discloses a preparation method of a bimetal composite seamless tube casting blank, which is characterized in that an outer-layer hollow material is used as a mold, an inner-layer solid material is solidified in the outer-layer hollow material, and the temperature of stainless steel or nickel-based alloy steel liquid is controlled to be 10-50 DEG C above the melting point of the outer layer. The outer layer is firstly heated to 600-700 DEG C in the solidification process, the temperature of the outer layer is controlled to 900-1050 DEG C in the solidification process, the hollow material wall part of the outer layer is melted and does not flow in the solidification process, and the inner layer and the outer layer are solidified and compounded to prepare the composite pipe blank. In the solidification, accumulation and rising process of the inner-layer solid material, the molten and compounded part at the lower part is subjected to heat preservation so as to be slowly cooled, namely, the stress is eliminated in the compounding process. And the stress is eliminated again after compounding is completed, so that the structure is homogenized, and cracks caused by poor toughness of the high-strength outer layer are overcome.

Described herein is a method of manufacturing an aluminium alloy rolled product of a heat-treatable aluminium alloy, comprising: semi-continuous casting a heat-treatable aluminium alloy into a rolling ingot; homogenizing of the rolling ingot to a peak metal temperature (PMT) and whereby said aluminium alloy has a specific energy associated with a DSC signal less than 2J / g in absolute value; hot rolling of the rolling ingot in multiple hot rolling steps into a hot rolled product having a final rolling gauge of at least 1 mm, whereby the hot rolled product during at least one of the last three rolling steps has a temperature less than 50° C. below PMT; quenching of the hot rolled product at final rolling gauge from hot-mill exit temperature to below 175° C.; optionally stress relieving and ageing of the quenched and optionally stress relieved hot rolled product.

The invention relates to the technical field of metal processing, and provides a decoiler cutting device for hot-rolled coil plate processing, which comprises a workbench and a control panel, a decoiler machine is mounted on one side of the workbench, a moving frame is mounted on one side of the decoiler machine, a cutting frame is mounted on one side of the moving frame, and a stress relief structure is arranged at the top end of the moving frame. Through cooperative use of the fixing columns and the hinge rods, the knocking rods are driven to knock the edge of the hot-rolled coil plate in a reciprocating mode, periodic dynamic stress vibration loads can be applied to the edge of the coil plate through continuous knocking vibration, and after dynamic stress and edge residual stress static stress are superposed, the edge of the coil plate is subjected to dynamic stress vibration; the stress state of the local area exceeds the yield strength threshold value of the material, microcosmic plastic deformation is triggered, and the deformation enables the originally locked residual stress to be released, so that the residual stress at the edge of the rolled plate is eliminated, the cutting quality is not easily influenced by the residual stress at the edge in the subsequent cutting process, and the cutting quality is improved. Therefore, the effect of eliminating stress is achieved.

The invention relates to the technical field of production equipment of ultrathin metal materials (such as stainless steel, titanium alloy, copper alloy and aluminum alloy), and the production thickness can reach 0.01 mm. The invention particularly discloses a stress relief annealing production line for the ultrathin metal materials. The stress relief annealing production line comprises an unwinding mechanism, a stress relief furnace, a heat dissipation furnace, a winding mechanism and a double-tension control system. The double-tensioning-force control system comprises a first tensioning mechanism, a second tensioning mechanism and a control mechanism, the first tensioning mechanism is used for adjusting the tensioning force of the coiled material before the coiled material enters the destressing furnace, the second tensioning mechanism is used for adjusting the tensioning force of the coiled material before the coiled material enters the heat dissipation furnace, and the control mechanism is used for controlling the tensioning force of the coiled material after the coiled material enters the heat dissipation furnace. The second tensioning mechanism is used for adjusting the tensioning force of the coiled material discharged from the destressing furnace, the control mechanism is electrically connected with the first tensioning mechanism and the second tensioning mechanism, and the control mechanism controls the tensioning actions of the first tensioning mechanism and the second tensioning mechanism. The method has the advantages that the heat treatment process of the ultra-thin metal material is conducted smoothly, and therefore the production quality of the ultra-thin metal material can be improved.

The utility model provides an aluminum material cold extrusion device, which relates to the technical field of aluminum material cold rolling devices, and comprises a base and a cold rolling mechanism, one end of the base is rotatably connected with an aluminum coil, one side of the aluminum coil is provided with a limiting roller, the other side of the limiting roller is provided with an auxiliary roller, a mounting rack is arranged above the auxiliary roller, and the mounting rack is connected with the cold rolling mechanism. Stress of an aluminum material before cold rolling is detected through an ultrasonic probe, a hydraulic supporting column drives a pressure plate to press downwards, stress is eliminated through extrusion pressure, microwaves are emitted through a microwave probe, eddy current is formed in the aluminum material, stress of the aluminum material is eliminated, and the aluminum material can be subjected to cold rolling by adjusting the power of the microwave probe. According to the device, stress is accurately treated, liquid nitrogen is sprayed out of a spray head to rapidly cool the aluminum material, the internal structure of the aluminum material is prevented from being damaged by high temperature, and the device is provided with multiple stages of destressing assemblies, so that the internal stress of the aluminum material is eliminated, the risks of deformation and cracking are reduced, the stability of the aluminum material is improved, and follow-up cold rolling treatment operation is facilitated.

The invention discloses a tool clamp for flange pipe fitting welding, and relates to the technical field of flange pipe fitting welding, the tool clamp comprises a hollow carrier plate and a pipe fitting body mounted on the upper surface of the hollow carrier plate, and further comprises a spherical hammer which is arranged on the upper surface of the hollow carrier plate and can knock the welding seam position of the pipe fitting body, the driving mechanism is arranged in the middle of the upper surface of the hollow carrying plate, used for being connected with the spherical hammer and capable of controlling the spherical hammer to move along a set path, and the driving mechanism can drive the spherical hammer to track the welding gun in real time, so that just-molten melt permeates into the deep layer of a welding seam of the pipe fitting body, and synchronous fixing is achieved through the outer fixing plate and the inner fixing rod; a spherical hammer tracks a welding gun to knock a welding seam in real time and timely eliminates stress; an inner fixing rod is switched into a dynamic positioning mode in the knocking process; the pipeline is released at the knocking moment; a permeation space is created for melt;

The invention discloses a gas turbine blade heat dissipation coating structure and a coating forming method, the coating structure comprises a fixing layer, a bonding layer and a surface layer which are sequentially arranged outwards from the surface of a blade base body, the fixing layer is a first multi-component alloy deposited through electroplating, the physical properties of the blade base body and a heat dissipation coating are matched, stress is eliminated, and the connecting effect is achieved; the bonding layer contains ceramic nanofibers and a second multi-component alloy, the ceramic nanofibers are subjected to polarizable modification treatment and have high thermal conductivity and thermal expansion coefficient matching performance, the surface layer is an extension part of the ceramic nanofibers, the curvature radius of the tip end is small, and therefore the heat radiation effect is enhanced; the thermal stress of the heat dissipation coating and the blade base body in the wide temperature range is effectively eliminated, the thermal radiation coefficient of the surface of the blade base body is enhanced through radiation heat exchange of the high-temperature-resistant ceramic nanofiber tips, the working temperature of the blade base body is remarkably reduced, and the fatigue resistance of the surface of the blade base body is improved.

According to the thin film deposition method provided by the invention, the annealing treatment at 650 DEG C is performed on the first thin film deposited on the surface of the wafer boat and the surface of the furnace tube each time at the preset temperature, so that the stress of the first thin film on the surface of the wafer boat and the surface of the furnace tube tends to 0, and the stress accumulation can be effectively eliminated. Depositing and annealing are repeated until the films on the surface of the wafer boat and the surface of the furnace tube are deposited to a first preset thickness, a second film is deposited on the first film on the surface of the wafer boat and the surface of the furnace tube which are deposited to the first preset thickness, the stress of the second film is opposite to that of the first film, and the effect of neutralizing the stress is achieved; and the second thin film is polycrystalline silicon with higher roughness, so that the adhesive force of thin film deposition on the surface of a subsequent wafer boat and the surface of a furnace tube is improved. The principle is simple, the thin film stress on the surface of the wafer boat and the surface of the furnace tube obtained through repeated operation is reduced, the adhesive force is improved, and the expected maintenance frequency is reduced.

The present application relates to the technical field of ship welding, and particularly relates to a ship welding residual stress elimination auxiliary tool and a stress elimination device. The ship welding residual stress elimination auxiliary tool comprises a fixing plate for fixing an ultrasonic impact gun, the fixing plate is provided with a fixing hole, the fixing plate is provided with two supporting rods, the supporting rods are uniformly and spacedly arranged around the axis of the fixing hole, and the supporting rods are slidingly arranged on the fixing plate; the supporting rods have threaded sections, and the abutting portions of the supporting rods are located on the same side of the fixing plate; the auxiliary tool adjusting mechanism comprises a driving wheel rotatingly arranged on the fixing plate, the driving wheel is internally provided with a threaded hole threadedly matched with the threaded section of the threaded rod; and an adjusting knob is in transmission connection with the driving wheel. Thus, the problem that the pressing force relies on the experience of workers when the workers hold the ultrasonic impact gun to work, thereby affecting the stress elimination effect and increasing the occupational health risk of the workers is solved.

The application discloses a heat treatment method of low-carbon high-chromium heat-resistant steel large-size continuous casting billets, which comprises the following steps: slow cooling process, the low-carbon high-chromium heat-resistant steel large-size continuous casting billets are slowly cooled and pit-cooled or furnace-cooled to 100-150 DEG C; tempering process, the low-carbon high-chromium heat-resistant steel large-size continuous casting billets slowly cooled to 100-150 DEG C are put into a furnace, heated to 765+ / -10 DEG C at a heating speed less than 100 DEG C / h, kept for 14-16 hours, then furnace-cooled to <=500 DEG C, and out of the furnace for air cooling to room temperature. The application directly carries out tempering after slow cooling of the casting billets instead of conventional annealing, not only significantly shortens the furnace time, but also greatly saves energy and effectively reduces production cost, thus breaking through the annealing+tempering stress relieving heat treatment process mechanism in the field, and effectively solving the technical problems of high production cost and long annealing furnace time in the prior art.

The invention discloses non-oriented silicon steel for a driving motor and a manufacturing method of the non-oriented silicon steel. The non-oriented silicon steel comprises the following chemical components in percentage by weight: less than or equal to 0.0025% of C, 2.7-3.2% of Si, 0.25-0.50% of Mn, less than or equal to 0.010% of P, 0.65-0.80% of Als, less than or equal to 0.0025% of S, less than or equal to 0.0020% of N, less than or equal to 0.0020% of Ti, 0.015-0.035% of Cu and the balance of Fe and inevitable impurities. The production method comprises the production steps of molten steel smelting, continuous casting, heating, rolling, normalizing pickling, cold rolling, annealing, stamping flaking and stress relief annealing. By adjusting alloy elements and combining process design, on the premise that the excellent magnetic performance of the material is guaranteed, the mechanical performance is improved by adopting a solid solution strengthening principle, deterioration of the magnetic performance in the sheet manufacturing process is eliminated through solid solution and stress relief annealing, the magnetic performance of the iron core is improved, and the mechanical performance of the product is improved.

The invention provides a production process of an elbow expansion bolt, which relates to the technical field of bolt production and realizes efficient production and quality improvement of the elbow expansion bolt through the steps of multi-station cold heading forming, high-precision thread rolling, gradient heat treatment, environment-friendly electroplating, intelligent detection and the like. An ML08 material wire is adopted to synchronously complete head pre-forming, bent part forming and rib position pressing through a three-station cold header, the key size is controlled in cooperation with a Cr12MoV alloy steel mold, stress is eliminated through gradient heat treatment staged heating, the rod strength is improved to 8.8 grade, a zinc-nickel alloy coating is adopted for environment-friendly electroplating in combination with ultrasonic pickling, the coating thickness is larger than or equal to 8 micrometers, and the thickness of the coating is larger than or equal to 8 micrometers. No white rust exists in 72 hours of salt spray test, no red rust exists in 120 hours of salt spray test, and intelligent tail cutting is combined with visual positioning and magnetic powder inspection, so that the tail precision and no crack defect are ensured. Gradient heat treatment realizes mechanical property optimization, environment-friendly electroplating enhances corrosion resistance, and intelligent detection guarantees product consistency.

The invention relates to the technical field of stress relieving devices, and discloses a device and method for relieving welding residual stress of a super-thick non-ferrous metal part, the device comprises an explosion tank and a hardening container, and explosion impact is generated in the explosion tank to conduct residual stress relieving on a metal workpiece in the hardening container; a guide channel is formed in the hardening container, a self-adaptive channel is formed in the guide channel, the self-adaptive channel can be adjusted in a user-defined mode so as to correspond to the welding seam shape of the metal workpiece, a conduction channel for explosive impact to pass through is formed in a gap between the two sets of flexible clamping plates, and the explosive impact is conducted to the welding seam of the metal workpiece through the conduction channel. A directional conduction channel is formed through the gaps of the flexible clamping plates, shock wave energy is efficiently focused on a welding seam, stress is accurately eliminated, energy scattering is avoided, the anti-explosion stability is achieved, the flexible clamping plates made of metal woven materials have the impact resistance and the flexible deformation capacity, the sealing performance of the channel is maintained under high-pressure explosion, and energy leakage is prevented.

The application relates to the technical field of metal plate composite technology and discloses a preparation process of a Kovar alloy-copper composite plate, which comprises the following steps: a preparation process of an Invar alloy-copper composite plate, which comprises the following steps: s1, taking one Invar alloy plate and two copper plates; s2, immersing the Invar alloy plate into liquid copper after the Invar alloy plate is heated to 250-300 DEG C; s3, positioning the two copper plates and the Invar alloy plate to form a group of initial composite plate materials; s4, heating the whole in a heating furnace, the heating temperature is 700-850 DEG C, and the heating time is 20-40 min; s5, taking out and cooling to 500-650 DEG C, and then performing hot rolling; s6, performing stress relieving annealing on the composite blank; s7, naturally cooling to normal temperature after annealing, and cold rolling to form an Invar alloy-copper composite plate with a preset thickness. The Invar alloy-copper composite plate prepared through the process is more stable and not easy to separate between the plates, the composite plate has the physical properties of the Kovar alloy and good thermal conductivity.

Processing method for avoiding burning of titanium alloy bushing coated with TiN by PVD, belongs to the technical field of bushing production. The method comprises the following steps: S1: pretreatment; S2: numerical control rough machining; S3: bench work and stress relief; S4: numerical control semi-finishing and grinding; S5: numerical control finishing; S6: inspection and treatment. The present application increases the stress relief process before the finishing process, releases the stress generated during the rough machining of the part, and avoids the deformation of the workpiece caused by stress release during finishing or PVD TiN coating process, resulting in size out-of-tolerance. Adjust the marking process sequence of the workpiece, which can effectively prevent the high-precision size of finishing from deforming due to external force during the marking process, resulting in size out-of-tolerance.

This invention relates to the field of heat treatment methods and discloses a quenching and tempering heat treatment process for 42CrMo1 steel based on end-quenching value control. The process includes steps 1: pre-quenching and tempering preparation (related end-quenching value preset), 2: quenching treatment (core end-quenching value control step), 3: tempering treatment (stress relief and microstructure stabilization), 4: post-quenching and tempering quality verification (related end-quenching value feedback), and 5: finished product identification and archiving. This process achieves a balance between hardenability and quenching cracking risk, reducing the scrap rate through "precise control of Ti element + synergistic optimization of main alloy composition." It avoids excessive hardenability caused by excessive main alloy composition and refines grains and improves hardenability through Ti element, reducing the quenching cracking rate from 16.8% to below 3%. Out of 925 steering knuckles, only 30 were scrapped due to quenching cracking (cracking rate 3.25%). Furthermore, by reducing the stirring frequency (from 20Hz to 18Hz), the cracking rate in subsequent batches was further reduced to around 1%, completely solving the problem of "hardenability versus cracking." The core contradiction.