177 results about "Cold formed" patented technology

The invention relates to a 1100MPa-grade high-strength tool steel wire rod and a manufacturing method thereof, the wire rod adopts a middle-carbon Nb-V-containing chemical component design, after a steel billet is rolled and spun into the wire rod according to the spinning temperature of more than or equal to 860 DEG C, online molten salt semi-quenching isothermal treatment is performed, the wire rod is controlled to be subjected to front-section molten salt treatment, and then the steel wire rod is subjected to hot rolling and hot rolling to obtain the 1100MPa-grade high-strength tool steel wire rod. According to the method, the steel wire rod enters a bainite phase region from a high-temperature austenite state at the cooling speed of more than or equal to 30 DEG C / s to form a structure taking quenched bainite as a main component, and then is subjected to rear-section molten salt heating isothermal tempering and toughening destressing treatment, and finally is subjected to roller way slow cooling to prepare the steel wire rod with a microscopic structure comprising tempered bainite and ferrite, so that the material cost can be reduced, and the production efficiency is improved. The method has the advantages that martensite brittle structures are effectively avoided, the structure state of the hot-rolled wire rod is controlled, the plasticity and cold working performance of the wire rod are improved, the tensile strength of the product can reach 980-1030 MPa, the percentage reduction of area is 61%-66%, and the product can be directly machined into tool parts after cold forming.

The present invention discloses a stamping die system for preparing a sensor housing, comprising a feeding mechanism, a stamping mechanism for stamping materials, and a pushing mechanism for pushing materials to the stamping mechanism; the feeding mechanism comprises a vibration plate for holding materials, and a feeding channel, which are interconnected; the feeding channel is connected to the pushing mechanism, and the vibration plate provides a vibration force to transport the materials to the pushing mechanism through the feeding channel; when the pushing mechanism pushes the materials to the stamping mechanism, the stamping mechanism stamps the materials. The stamping die system of the present invention uses a cold forming process to process the sensor housing, which not only avoids technical problems such as frequent tool breakage in traditional machining methods, but also has high machining efficiency.

A cold formed beam formed from a single sheet of steel having an upper member and a lower member (e.g., square, rectangular, other shape) separated by a web. The web may include stamped apertures and / or embossments around at least a portion of the stamped apertures. The cold formed beam may include beam connections that operatively couple the ends of the steel sheet used to form the beam to a portion of the beam (e.g., the web). The beam connections may by interference connectors formed from deformation of two or more layers of beam (e.g., clinching, or the like). Among other benefits, forming the cold formed beam from a single sheet, stamping of the web, and / or the using deformation connections (e.g., clinching, or the like) of the ends of the sheet allows for the pre-coating (e.g., galvanized, painting, or the like) of the sheet before the forming.

The invention relates to a 1150MPa-grade high-strength carbon tool steel wire rod and a manufacturing method thereof.The 1150MPa-grade high-strength carbon tool steel wire rod comprises, by mass, 0.57%-0.62% of C, 0.38%-0.47% of Si, 0.53%-0.63% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.015% of S and the balance Fe and inevitable impurities, after the wire rod is rolled and spun, online molten salt isothermal toughening treatment is conducted on the wire rod, the wire rod is controlled to enter a sorbite phase region from a high-temperature austenite state, and the steel wire rod is subjected to high-temperature annealing treatment; the method comprises the following steps of: preparing a steel wire rod of which the microscopic structure comprises tempered sorbite, ferrite and fused sorbite, forming a structure mainly comprising fine lamellar spacing sorbite, carrying out isothermal tempering, and finally slowly cooling through a roller way, so that the steel wire rod of which the microscopic structure comprises tempered sorbite, ferrite and fused sorbite can reach the tensile strength of 1050-1100MPa and the percentage reduction of area of 45-50%, and can be applied to the application fields of manufacturing carbon tool steel and the like. And therefore, a tool part can be directly processed after cold forming.

The invention relates to a 1150MPa-grade high-strength tool steel wire rod and a manufacturing method thereof, the wire rod adopts a high-Cr medium-carbon component design, after a steel billet is rolled and spun into the wire rod, on-line molten salt low-temperature quenching isothermal treatment is performed, the wire rod is controlled to be subjected to front-section molten salt treatment firstly, the wire rod enters a lower bainite phase region from a high-temperature austenite state at a cooling speed of more than or equal to 35 DEG C / s, and the steel wire rod is subjected to high-temperature quenching isothermal treatment at a cooling speed of more than or equal to 35 DEG C / s; the method comprises the following steps: quenching bainite to form a structure taking the quenched bainite as a main part, then carrying out rear-section molten salt heating isothermal tempering and toughening destressing treatment, and finally carrying out roller bed cover opening slow cooling to prepare the wire rod with a microscopic structure comprising tempered bainite and ferrite, so that the initiation of an abnormal brittle structure can be inhibited, the structure state of the wire rod is effectively controlled, and the toughness performance matching of the wire rod is improved; the tensile strength is 1050-1100 MPa, and the percentage reduction of area is 59%-64%, so that the alloy can be directly processed into parts after cold forming.

The invention discloses a production method of an economical easy-to-form rare earth Ti microalloyed 700MPa-grade girder steel belt. The production method comprises the following steps: a steelmaking process; in the controlled rolling air cooling process, the heating temperature of the plate blank is controlled to be 1240-1270 DEG C, and the soaking time is controlled to be 20-30 min; 3 + 3 six-pass rolling is adopted for rough rolling of the plate blank, and the rolling reduction of the first pass is increased and controlled to be 35-40 mm; the temperature of an intermediate billet is controlled to be smaller than or equal to 980 DEG C, the thickness of the intermediate billet is controlled to be 55-60 mm, and the finish rolling temperature is controlled to be 830-860 DEG C; the cooling speed is controlled to be 15-30 DEG C / s, and the coiling temperature mainly considers the optimal TiC precipitation temperature and is controlled to be 590-620 DEG C; the performance of the steel strip meets the conditions that the yield strength is larger than or equal to 600 MPa, the tensile strength ranges from 700 MPa to 880 MPa, the ductility is larger than or equal to 14%, and the steel strip has good cold formability and meets the use requirements of customers.

The invention discloses a production method of high-toughness NM450 wear-resistant steel. The steel comprises the following chemical components in percentage by weight: 0.19%-0.20% of C, 0.25%-0.45% of Si, 1.10%-1.20% of Mn, less than or equal to 0.010% of P, less than or equal to 0.002% of S, 0.65%-0.70% of Cr, 0.020%-0.025% of Nb, 0.014%-0.020% of Ti, 0.070%-0.090% of Alt, 0.0014%-0.0020% of B, less than or equal to 0.00015% of H, less than or equal to 0.0045% of N, less than or equal to 0.0015% of O and the balance of Fe and inevitable impurities. The process comprises the steps of converter smelting, LF refining, VD vacuum degassing, continuous casting, heating, rolling and heat treatment, the thickness of the produced NM450 wear-resistant steel plate ranges from 6 mm to 25 mm, the surface hardness ranges from 420 HBW to 480 HBW, the yield strength is larger than or equal to 1200 MPa, the tensile strength is larger than or equal to 1400 MPa, the elongation is larger than or equal to 14%, the requirement for 6a diameter 90-degree cold bending is met, the impact Akv at the temperature of-20 DEG C is larger than or equal to 60 J, the impact Akv at the temperature of-40 DEG C is larger than or equal to 40 J, the toughness performance is matched, the bending cold forming performance is excellent, and the welding performance is good.

The application discloses a high cold formability austenitic stainless steel cold-rolled plate and a production method thereof, and solves the technical problem of poor cold formability of the austenitic stainless steel cold-rolled plate. The high cold formability austenitic stainless steel cold-rolled plate comprises the following components in percentage by mass: C: 0.035-0.045%, Si: 0.25-0.3%, Mn: 2-3%, Cr: 14-14.5%, Ni: 9-9.5%, N: 0.17-0.20%, Cu: 1.3-1.6%, Mo: 0.5-0.7%, and the rest is Fe and inevitable impurity elements. The production method of the high cold formability austenitic stainless steel cold-rolled plate comprises smelting, refining, slab continuous casting, cold rolling, heat treatment and coiling. The application can improve the cold forming performance of the cold-rolled plate, and meanwhile, guarantees that the microstructure performance of the cold-rolled plate is stable after forming.

According to the NM450 wear-resistant steel suitable for the polar working condition and the production method thereof, low-cost component design is adopted, and the process steps comprise smelting, refining, continuous casting, heating, rolling and heat treatment; the steel-making process and harmful elements are strictly controlled to improve the purity of molten steel so as to improve the internal quality of the steel plate, and a strict rolling, quenching and low-temperature tempering heat treatment process is adopted. The NM450 wear-resistant steel plate which is high in toughness adaptability, high in wear resistance and excellent in cold forming performance comprehensive performance is developed, the thickness ranges from 6 mm to 30 mm, the surface hardness ranges from 450 HBW to 480 HBW, the core hardness ranges from 440 HBW to 465 HBW, and the core hardness reaches 95% or above of the surface hardness; the yield strength is not less than 1200 MPa, the tensile strength is not less than 1400 MPa, and the elongation is not less than 13%; the impact AKV at-50 DEG C is greater than or equal to 60J, and the impact AKV at-60 DEG C is greater than or equal to 40J; the bending angle is 90 degrees, the bending diameter D is 6a, and the cold bending result is intact.

The invention relates to a Cu-containing low-alloy high-strength steel with a yield strength of 1100MPa and a manufacturing method thereof. The chemical components of the steel are C: 0.015%-0.050%, Si: 0.85%-0.95%, Mn: 0.45%-0.65%, P≤0.010%, S≤0.005%, Cr: 0.85%-1.00%, Ni: 2.30%-2.70%, Cu: 2.25%-2.65%, Zr: 0.105%-0.180%, Mo: 0.15%-0.30%, Alt: 0.195%-0.295%, Ni / Cu ratio is controlled at 1-1.2, and the remainder is Fe and impurities. Through the synergistic effect of elements such as Cu, Al, Mn, Ni, Si, Mo, and Zr, the "offline quenching + high temperature tempering" process is adopted to form the dispersion precipitation of Cu-containing nano-metastable phase and the precipitation of Zr and / or Mo carbides, combined with solid solution strengthening, so that the produced steel plates have excellent high strength, excellent low-temperature toughness, welding performance and cold forming performance.

The utility model belongs to the field of single crystal furnace manufacturing, particularly relates to a high-strength cold forming composite end socket for a single crystal furnace, and aims to solve the problems that the conventional end socket for the single crystal furnace is difficult to simultaneously meet the requirements of high temperature resistance, high pressure resistance and mechanical strength, a furnace body and the end socket are inconvenient to align when the end socket is mounted, and the cost is high. In order to solve the problem that the welding position of the end socket is not accurate due to the fact that the welding position of the end socket is not accurate, the utility model provides the following scheme that the end socket comprises an end socket body, a plurality of connecting lugs which are uniformly distributed are welded on the circumference of the end socket body, and chamfers are arranged on the sides, close to the end socket body, of the connecting lugs. The sealing head body is made of various materials and used for installing and positioning the sealing head body, so that the sealing head body is more convenient and faster to install, the sealing head body not only has excellent high-temperature resistance and corrosion resistance, but also has the characteristics of high strength, high toughness, wear resistance and oxidation resistance, the service life of the sealing head is greatly prolonged, and the safety of the sealing head is greatly improved.

This invention discloses a method and apparatus for preparing metal ingots based on melt flow-limited stacking casting and rapid cooling forming, relating to the field of metal forming technology. This method is based on continuous or intermittent advancement of melt flow-limited bottom casting, layer-by-layer reciprocating stacking, and layer-by-layer relay rapid cooling forming. It can achieve continuous rapid cooling forming of the molten metal, refining grains, and by limiting atomic diffusion, achieve layer-by-layer freezing-type rapid solidification forming with uniform atomic distribution in the molten metal, reducing component segregation. It can also simultaneously achieve the relay upward movement or reduction of casting defects such as shrinkage cavities and porosity layer by layer. The flow-limiting guide nozzle is equipped with a liquid outlet and a parallel and similarly shaped anti-oxidation coolant spray nozzle, located at the bottom of a crucible with a filter to reduce inclusions. This invention can simultaneously and rapidly reduce and coordinately control defects such as coarse grains, shrinkage cavities, porosity, component segregation, and inclusions during the solidification of the molten metal in a short process, achieving short-process, high-quality manufacturing of metal ingots, especially large metal ingots (including amorphous ingots).

The invention discloses a method for preparing a clad plate strip by adopting a hot continuous rolling process and the clad plate strip. The method sequentially comprises the steps of plate blank heating, rough rolling, clad blank preparation, clad rolling, controlled cooling and coiling, wherein a plate blank is subjected to surface polishing after being subjected to rough rolling and dephosphorization, then is subjected to preliminary covering and welding with a to-be-covered plate strip to form a covering blank, and then enters a finishing mill group to be subjected to covering rolling; the surface polishing of the plate blank, the preliminary covering of the to-be-covered coil and the welding are all carried out in an atmosphere protection cover, and N2, CO2 or a mixed gas of N2 and CO2 is introduced into the atmosphere protection cover; the plate blank is made of carbon steel; and the plate strip to be covered comprises titanium, copper or stainless steel. According to the invention, the hot continuous rolling process is adopted to produce the clad plate strip on line, the clad plate strip integrates the excellent characteristics of corrosion resistance, electric conduction, heat dissipation and beauty of the clad layer and high strength of the substrate, and the cost is lower and the application range is wider to the greatest extent; the product has the characteristics of corrosion resistance, good heat dissipation performance, easiness in cold forming processing, attractive appearance and no coating.

The present invention relates to a 1100MPa grade high-strength tool steel wire rod and a manufacturing method thereof. The wire rod is designed with a chemical composition of medium carbon and Nb-V. The steel billet is rolled and spun into wire rod at a spinning temperature of 860°C or higher. The wire rod is then subjected to an online molten salt semi-quenching isothermal treatment. The wire rod is controlled to first undergo a front-end molten salt treatment so that the wire rod enters a bainite phase region from a high-temperature austenite state at a cooling rate of 30°C / s or higher, forming a structure mainly composed of quenched bainite. The wire rod is then subjected to a rear-end molten salt heating isothermal tempering and toughening stress relief treatment. Finally, the wire rod is slowly cooled on a roller to form a wire rod with a microstructure including tempered bainite and ferrite. The method can reduce material cost, effectively avoid martensitic brittle structure, control the microstructure of the hot-rolled wire rod, improve the plasticity and cold working performance of the wire rod, and achieve a product tensile strength of 980-1030MPa and a cross-sectional reduction rate of 61%-66%, so that the product can be directly processed into tool parts after cold forming.

This invention discloses an electric field-assisted spline cold forming method and machine tool; this invention belongs to the technical field of machining and metal plastic forming equipment; it aims to solve the problems of high load, rapid mold wear and poor forming quality in the cold forming of splines of difficult-to-deform materials such as high-strength alloy steel and titanium alloy; the positive terminal of the pulse power supply forms a circuit with the workpiece through the center and the negative terminal through the brush, so that the high-frequency pulse current flows directly through the cold forming deformation zone, inducing the electroplastic effect, reducing the yield strength of the material and improving plasticity; on this basis, the symmetrically arranged cold forming tools apply radial force to the workpiece as the spindle rotates, and the spline teeth are formed by the axial feed and rotation of the workpiece; this method deeply couples electric field softening with mechanical forming, fundamentally reducing the forming load, extending the mold life and improving the spline dimensional accuracy and surface quality.

This invention discloses a method for producing easily formable ultra-high strength steel plates for engineering machinery, belonging to the field of metal material processing technology. This invention employs a medium-carbon + multi-element microalloying system, and through converter steelmaking + refining, continuous casting, billet heating, two-stage controlled rolling, and quenching + tempering heat treatment, produces ultra-high strength steel plates with a thickness of 5-20 mm. The resulting steel plate has a matrix structure of ultra-fine-grained lath martensite with an effective grain boundary size of 1.2-1.5 μm, a yield strength ≥1500 MPa, a tensile strength ≥1800 MPa, an elongation >10%, an impact energy >50 J at -40℃, and meets the requirements of D=6a and 180° bending without cracking. It possesses ultra-high strength, excellent low-temperature toughness, and cold formability, and can be directly used for forming key load-bearing structural components of engineering machinery. The process is simple and highly adaptable to industrial applications.

The invention relates to a method for producing a cylindrical metal connector, wherein the connector comprises a tubular body with two internally hollow cylindrical areas joined by an intermediate area with a polygonal outer edge. The method is characterised in that the metal connector is produced from a single tubular metal element by means of a step of cold forming using a first tubular expansion tool intended to be in contact with the side wall of the tubular metal element, the first tool being provided with a section comprising a plurality of radially expandable segments shaped to provide the form of the polygonal intermediate section, each segment having a protruding edge. The segments are expanded by the action of a punch, such that, when the punch moves towards the first tool, as the punch is inserted into the first tool, the segments expand towards the side wall of the tubular body to be shaped, thereby forming the intermediate area with a polygonal edge.

The invention provides a method for preparing a high-performance surface modified titanium filter through titanium waste recovery, and relates to the technical field of filter preparation. The method sequentially comprises the steps of titanium raw material hydrogenation, micron-sized titanium hydride powder preparation, porous titanium filter cold forming die preparation, titanium filter compact preparation, porous titanium filter preparation and high-performance surface modification titanium filter surface modification. The filter prepared from the titanium waste has the advantages of long service life, high filtering precision, short production flow and low production cost; the problems that an existing filter used for filtering titanium tetrachloride is short in service life, prone to perforation and breakage, insufficient in filtering precision and high in cost are solved. The preparation technology of the filter has no special limitation on raw material components, can meet the requirements under different production environments and conditions, and has wide applicability.

The present disclosure relates to designing of steel composition for line pipe steel to be used for sour environment. The developed steel of the present disclosure exhibits enhanced tensile properties in accordance with API 5L PSL-2 specification for X-65 grade steel, along with superior hydrogen induced cracking resistance with crack length ratio (CLR) of less than 10%, crack thickness ratio (CTR) of less than 5%, crack sensitivity ratio (CSR) of less than 2%. The developed steel is designed such that it is readily hot / cold formed and welded to form linepipe tubes to be used for the transportation of natural gas or crude oil, especially of sour grade. The present disclosure also provide a method of manufacturing the said steel having the composition of the present disclosure.

The present disclosure relates to multilayer, multibarrier, cold formable blister laminate. The present disclosure further relates to a compact blister pack made by cold forming of the multilayer, multibarrier, cold formable blister laminate. The laminate of the present disclosure incorporates or interlace mechanical cum impact strength enhancing materials, desiccant materials or both mechanical cum impact strength enhancing and desiccant materials. The laminate of the present disclosure has enhanced deep draw formability as well as is capable of yielding cold formed blisters of compact size along with improved mechanical and impact strength for cavities with large dimensions without any rupture after forming and at the same time providing requisite ultra high barrier with use of desiccant interlacing when required, against adverse environmental impact. The laminate of the present disclosure can be used for packaging of various products having large dimensions and which are fragile as well as sensitive or highly sensitive to moisture, temperature, and light.

The invention discloses a corrosion-resistant and high-performance aluminum alloy cable material as well as a preparation method and application thereof, and relates to the technical field of aluminum alloy preparation. The component formula of the conductor is Al-xMg-ySi-zNi-mCe-nSc-qY, x is larger than or equal to 0.05 and smaller than or equal to 0.3, y is larger than or equal to 0.6 and smaller than or equal to 1.4, z is smaller than or equal to 0.35, m is larger than or equal to 0.01 and smaller than or equal to 0.2, n is larger than or equal to 0.03 and smaller than or equal to 0.2, q is larger than or equal to 0.04 and smaller than or equal to 0.1, iron is a main impurity element in the alloy, and the content of the iron is not larger than 0.1%. The aluminum alloy cable material with excellent mechanical properties (the tensile strength is larger than or equal to 122 MPa, and the elongation is larger than or equal to 14%), electrical properties (the conductivity is larger than or equal to 62% IACS) and corrosion resistance (the maximum IGC depth is smaller than 100 micrometers) is prepared by adopting the technological method of flame direct injection smelting, synchronous water quenching pull casting, cold forming machining and non-isothermal aging synchronous heat treatment, and the aluminum alloy cable material is suitable for aluminum alloy cables. The method is short in technological process, good in cable quality, high in corrosion resistance and wide in application prospect.

The invention relates to a method for producing a steel sheet component, in which a steel sheet blank is cut from a hot-rolled and cold-rolled flat steel strip coated with a zinc-based coating, and the steel sheet blank is at least partially heated to a temperature above Ac3 and then formed and quench-hardened in the hot state in a press hardening tool, or a steel sheet blank is cold-formed into a steel sheet preform part, the steel sheet preform part is quenched and hardened in a forming and hardening tool, the heating speed is set in a temperature range of 420 DEG C to 530 DEG C, so that the silver coloring coefficient S is greater than 1, and the heating is carried out at a heating speed which varies with the holding time of the furnace, and the heating speed is related to the thickness of the zinc layer.

This invention provides an electroslag welding apparatus and a welding method thereof. The electroslag welding apparatus includes a workpiece body and a power source. A slag pool is disposed within the workpiece body, and a molten pool is disposed below the slag pool. Metal slag in the slag pool accumulates below the molten pool after passing through it, forming a weld. A liquid-cooled forming slider is disposed around the periphery of the molten pool. The height of the molten pool increases with the accumulation of the weld, and the height of the liquid-cooled forming slider also increases with the molten pool. Furthermore, a first conductive path is provided between the slag pool and the positive electrode of the power source, a second conductive path is provided between the weld and the negative electrode of the power source, and a third conductive path is provided between the liquid-cooled forming slider and the negative electrode. The electroslag welding apparatus provided by this invention can solve the problem of poor weld formation quality in the prior art.

Steel flat product for cold forming consisting of a steel substrate coated with a protective coating, wherein the protective coating consists of an inner Al-Si-containing and an outer alkaline earth oxide and / or transition metal oxide-containing layer, and wherein the steel substrate has a composition containing (in wt.%): - up to 0.09 carbon - up to 0.3 silicon - up to 0.9 manganese - up to 0.025 phosphorus - up to 0.02 sulfur - up to 0.1 aluminum - up to 0.14% titanium and / or niobium - up to 0.001 boron, and possibly - further alloying elements selected from the group up to 0.01 N, up to 0.15 Cu, up to 0.15 Cr, up to 0.15 Ni, up to 0.025 Mo, and / or up to 0.05 Sn, and - Residual iron and unavoidable impurities.

The object of this invention is to provide a high-strength hot-rolled flat steel product and a method for producing such a flat steel product, thus achieving a combination of high strength with high local cold formability and high economy in terms of steel. This is achieved through a high-strength hot-rolled flat steel product with high local cold formability, having a tensile strength Rm of at least 760 MPa, a yield strength ratio of at least 0.8, and a porosity of at least 30%, advantageously at least 40%, particularly advantageously at least 50%, at least 10%, preferably at least 16%, an elongation at break of at least 0.12, advantageously at least 0.17, and a ratio of local cold formability to overall cold formability of at least 5 and at most 13, and a microstructure consisting of more than 50% (by volume) bainite, no more than 10% (by volume), advantageously no more than 5% (by volume) carbon-rich microstructure such as martensite, retained austenite, pearlite, etc. The steel has a ferrite-based microstructure and the following chemical composition (wt%): C: 0.04–0.08; Si: 0.1–0.6; Mn: 1.0–2.0; P: maximum 0.06; S: ​​maximum 0.01; N: maximum 0.012; Al: not more than 0.06; Ti: not more than 0.18 and / or Nb: not more than 0.08; Mo: not more than 0.35; Ti+Nb greater than 0.06, wherein carbon and nitrogen exist in excess of stoichiometry according to the following formula: 1.0 < (C / 12 + N / 14) / (Ti / 48 + Nb / 93 + Mo / 96), the remainder being iron, including unavoidable steel-related elements.

The invention provides a bolt manufacturing method. The bolt manufacturing method comprises the steps that S1, a preset type of alloy material is formed into a bolt blank through warm upsetting machining; s2, grinding and thread rolling are conducted on the bolt blank to manufacture a bolt; s3, the bolt blank is subjected to solution treatment; s4, aging treatment is conducted on the bolt blank; and S5, the bolt blank is subjected to rolling treatment, and the bolt is manufactured. The defects of traditional hot and cold forming are avoided through warm upsetting machining, and the material utilization rate and the product stability are improved; the dimensional precision and the surface quality are ensured through grinding and thread rolling; various properties are improved through solid solution and aging treatment, and the reliability and safety of connecting parts are guaranteed; and the surface hardness and fatigue strength are enhanced through rolling treatment, the service life is prolonged, and the maintenance cost is reduced.

The invention is applicable to the technical field of rivet nut manufacturing, and provides a cold forming die and a cold forming process for a hardware bushing of an automobile door system, a first station performs full-closed forward extrusion deformation on a preformed part h to form a preformed part a; the second station turns over the preformed part a, forward extrusion is carried out to stretch a large hole in the rivet pressing end to form a thin wall, and a preformed part b is formed; upsetting forming of straight teeth is completed through forward extrusion at a third station, first-time forming of a rim and a tooth-shaped part is completed, and a preformed part c is formed; the two ends of the fourth station are extruded at the same time, head outer diameters are upset, and a preformed part d is formed; the two ends of the fifth station extrude upset heads at the same time and stretch inner holes at the two ends at the same time to form a preformed part e; upset heads are extruded at the two ends of the sixth station at the same time, end face large horn mouths are upset at one time through backward extrusion when inner holes are stretched at the two ends, and a preformed part f is formed; and when an inner hole of the preformed part f is punched into the seventh station, waste in the middle of the preformed part f is squeezed out instantly, and a finished part g is formed. Therefore, the efficiency is improved, and the cost is reduced.

The invention provides an electroslag welding device and a welding method thereof.The electroslag welding device comprises a workpiece body and a power source, a slag pool is arranged in the workpiece body, a molten pool is arranged below the slag pool, and metal slag in the slag pool is accumulated below the molten pool to form a welding seam after passing through the molten pool; a liquid cooling forming sliding block is arranged on the periphery of the molten pool; wherein the height of the molten pool is increased along with accumulation of the weld joints, and the height of the liquid cooling forming sliding block is increased along with the molten pool; moreover, a first conductive path is arranged between the slag bath and the positive electrode of the power supply, a second conductive path is arranged between the welding seam and the negative electrode of the power supply, and a third conductive path is arranged between the liquid cooling forming sliding block and the negative electrode. According to the electroslag welding device, the problem that in the prior art, the welding seam forming quality is poor can be solved.