37results about How to "Reduce fire times" patented technology

A method for machining TC4-DT titanium alloy large-specification slab forged piece comprises the following steps: billet forging, intermediate forging, high-low circulating forging, inverting upsetting forging and shaping forging. The method is characterized in that: the large-specification forging stock is adopted for integral forging according to the method; compared with a prior-art small-specification forging blank repeated upsetting forging technique, at a state that the upsetting deformation blank height-to-diameter ratio is restricted, single weight of the forged piece is greatly improved and reaches up to above one ton; according to the deformation role in metal pressure machining, appropriate forging starting temperature and forging finishing temperature are selected, and the technical parameters are reasonably matched; the metal sufficiently deforms in a transverse direction in the forging process; forming penetration efficiency is improved; actual deformation amount and deformation uniformity of the large-specification forged piece are increased; and capability of the product for satisfying the requirement is ensured. The method further has the following advantages: capability of realizing full mechanical operation in the forged piece production process, reduced manual operation arbitrainess, large forging pressure, reduced times of heating, high batch quality consistency, high ultrasonic flow detection grade, and greatly reduced production period.

The invention discloses a method for refining carbide of a flat-bottom type bearing ring, and relates to the field of refining of carbide of all bearings, in particular to the method for refining the carbide of the flat-bottom type bearing ring, which comprises the following steps of: heating a bearing bar, carrying out cross piercing pipe type forging, forging into a pipe, carrying out air cooling and heat preservation for 1-3 hours, and then carrying out furnace cooling to room temperature; the cross piercing pipe is cut at the room temperature, the cut sample is subjected to axial closed rolling forming forging at the room temperature, and a bearing ring semi-finished product is obtained; and the bearing ring semi-finished product obtained after axial closed rolling forming forging is machined to the required size, and a flat-bottom type bearing ring finished product is formed. In the pipe forming step, annealing is used for replacing an original cooling mode, the hardness is reduced, the cutting performance is improved, the structure is adjusted, and preparation is made for next-step room-temperature cutting. And compared with a traditional machining process, the annealing process after forging is omitted, the heating number is reduced, the cost is reduced, and the time is saved.

The invention relates to a method for forging 500-Kg-level GH3230 high-temperature alloy. According to the method, as the initial forging temperature is increased to 1200+ / -10 DEG C, the problems that as the transferring time is excessively long, the initial forging temperature is excessively low, and the forging interval is reduced accordingly are solved, the crack possibility is greatly reduced due to the increasing of the initial forging temperature, and a follow-up damage repairing step is avoided; meanwhile, the forging interval between the initial forging temperature and the final forging temperature is increased by 180 DEG C to 210 DEG C; as the forging interval is increased, the one-time pressing amount is greatly increased, and the heating number is effectively decreased accordingly; meanwhile, as the end of a forge piece is wrapped by heat preservation cotton, the temperature of the end of the forge piece is lower than the temperature of the end which is not wrapped by the heat preservation cotton due to the heat insulation effect of the heat preservation cotton, the time when the end, wrapped by the heat preservation cotton, of the forge piece is in the high temperature state is short accordingly, and the problem that as the end of the forge piece is not deformed, grains are thick and large can be solved.

The invention relates to a forming method that combines free forging and pulse current assisted extrusion to improve the microstructure uniformity of titanium alloy rods, including heating titanium alloy ingots to T1 temperature for A upsetting deformation treatment, A upsetting deformation treatment After the end, the titanium alloy ingot is air-cooled to room temperature, and then the titanium alloy ingot is heated to T3 temperature for B upsetting and drawing deformation treatment. After the B upsetting and drawing deformation treatment, the titanium alloy forging rod is obtained and the titanium alloy forging rod is quickly blown and cooled. To room temperature, the obtained titanium alloy forging rods are sequentially subjected to A extrusion deformation treatment, B extrusion deformation treatment and C extrusion deformation treatment on the pulse current assisted extrusion equipment, and C extrusion deformation treatment is air-cooled to room temperature to obtain titanium alloy. Alloy bars. By combining free forging and pulse current assisted extrusion compounding, a homogeneous and high-strength titanium alloy bar is prepared, and the microstructure uniform distribution and mechanical properties of the bar are improved to meet the performance requirements of aerospace fasteners.

The invention relates to an upsetting method of a battery pole piece roller, and belongs to the technical field of roller forging. According to the upsetting method of the battery pole piece roller, the battery pole piece roller comprises a roller body and a roller neck integrally formed at the two ends of the roller body, the diameter of the roller body is larger than that of the roller neck, andthe roller body is manufactured with a local upsetting method; during discharging, oddments are reserved at the root of the joint of the roller body and the roller neck; during upsetting, by means ofdrain caps, under the effect of inner holes of the drain caps, the reserved oddments flow, and the root of the roller body is formed; and an original roller body root blank flows to angles of the roller body, the angles are formed, and protrusions are generated. By means of the reserved oddments, the oddments flow during upsetting, it can be promoted that the edges finally deform to form right angles, large rounded angles are prevented from being formed, and normal product procedures are guaranteed. Compared with a traditional method, by means of the technological method, raw materials can besaved, the production cost can be reduced, and the utilization rate of the materials can be increased; and the heating number during upsetting can also be reduced, thus, the machining time is reduced, and the efficiency of overall machining is improved.

The invention provides a single axis extruding device and method for forming double nozzles simultaneously, and belongs to the field of manufacturing of thick-walled pipelines with nozzles. The device comprises an extruder with a lifting oil cylinder and an extruding machine. The extruding machine comprises an upper ejector rod, a lower ejector rod, an extruding barrel and an extruding barrel jacket. The extruding device is mounted on the extruder. The lifting oil cylinder drives the extruding barrel jacket to move in the vertical direction. The extruding barrel is tightly hooped through the extruding barrel jacket and moves along with the extruding barrel jacket. According to the single axis extruding device, metal in blanks flow through extrusion of the upper ejector rod and the lower ejector rod. When extrusion is started, a cavity is filled with the metal, and the blanks and the extruding barrel move together through friction force; and after bulging is completed, the metal on the upper nozzle flows to the upper nozzle, the metal under the lower nozzle flows to the lower nozzle, and the speed of the metal between the upper nozzle and the lower nozzle is zero relative to that of the blanks. The extruding device can direct form pipeline inner holes and nozzle inner holes, the structure strength at the nozzles is improved, the metal mechanical and structural properties are improved, and the material utilization rate is increased.

The invention discloses a process for performing non-oxidation technical transformation on a common medium-frequency forging furnace. The technical scheme adopted by the invention has the technical points that the common medium-frequency forging furnace consists of a nitrogen making machine, a nitrogen storage tank, a pipeline, a pressure gage, a circular ring-shaped air passage, more than four branch air passages and a furnace door, wherein the branch air passages are led to a hearth from the circular ring-shaped air passage, and the furnace body not only is normally closed but also automatically opens. Non-oxidation protection is performed on a to-be-heated workblank by nitrogen in the hearth, and the non-oxidation protection is also performed on the to-be-heated workblank by the nitrogen in a closed transporter from after the to-be-heated workblank is discharged from the furnace to before the to-be-heated workblank enters a forging die. The nitrogen can be charged to both ends from the middle of the hearth, also can be charged to the middle from both ends of the hearth, and also can be charged to the center of the hearth from one third of both ends of the hearth. The air passage can be integrated two sets of air passages and also can be an integrated single air passage. The air passage is made of a refractory material and is manufactured by using a special manufacturing process. The process has the application that the high-temperature non-oxidation technical transformation is performed on the medium-frequency forging furnace, and the goals that the energy is saved, the consumption is reduced and the cost is reduced are achieved.

The invention relates to a method for forging and pressing a semi-coupler with a large section and a high height-diameter ratio by using a 31.5 MN of oil press. A forging process route comprises the following steps of: upsetting; drawing; locally upsetting and forming by using a drain cap which is 1640 mm in outside diameter phi, 1100 mm in inside diameter phi and 310 mm in thickness; and thermally treating after forging: after forging a forged piece and air-cooling the forged piece till the surface temperature is 350+ / -10 DEG C, putting the forged piece in a thermal treatment furnace, controlling the temperature of the treatment furnace at 450-500 DEG C, after keeping the temperature for 3 h, cooling to 280+ / -20 DEG C with the furnace and keeping the temperature for 6 h, carrying out first super-cooling treatment, then raising the temperature to 650+ / -10 DEG C and keeping the temperature for 6 h, then raising the temperature again to 890+ / -10 DEG C, keeping the temperature and carrying out austenitizing treatment, lifting off a trolley, air-cooling through a fan, carrying out normalization treatment, air-cooling the forged piece till the surface temperature is 350+ / -10 DEG C and putting the forged piece in the furnace, cooling the furnace to 260+ / -20 DEG C and keeping the temperature for 7 h, carrying out second super-cooling treatment, raising the temperature to 650+ / -10 DEGC and keeping the temperature for 40 h, tempering, carrying out diffusion hydrogen and white point resistant treatment, cooling the forged piece with the furnace till the temperature is less than or equal to 250 DEG C, and taking out the forged piece from the furnace. The method disclosed by the invention is simple in process, fewer in heating frequency and lower in energy consumption. The quality of the forged piece can be obviously ensured.

The invention provides an upsetting stretching method of an annular billet preformed through a hollow ingot, relates to an annular billet upsetting stretching process, and aims at solving the problem of difficult axial upsetting of the annular billet in the prior art. The method specifically comprises the following steps: positioning a lower cushion ring on a worktable of a pressing machine; positioning a mandrel on the lower cushion ring; sleeving the annular billet with a mandrel cylinder bod; positioning the upper cushion ring on the upper end surface of the annular billet; arranging a hollow connecting rod on an upper cushion ring; downwards pressing a sliding block of the pressing machine to enable upsetting deformation of the annular billet; removing the hollow connecting rod and the upper cushion ring; removing the mandrel and the upset annular billet from an upsetting station to a stretching station; synchronously slightly pressing and rotating the upset annular billet through an upper stretching anvil and a lower stretching anvil so as to adjust the position relation; stretching the upset annular billet through the upper stretching anvil and the lower stretching anvil until an upset and stretched product is obtained. With the adoption of the method, a process of repeatedly upsetting and stretching the annular billet can be achieved; the heating number can be reduced, and moreover, the process is simplified; in addition, the product performance can be improved, and the production efficiency can be improved.

The invention relates to a forging processing method of titanium alloy rods, in particular to a method for improving the microstructure uniformity of titanium alloy large-size rods. Its characteristic is that it includes the following steps: Step 1: Heat and keep the titanium alloy large-size bar at 40-60°C below the β transformation temperature for 2-4 hours, and then take it out of the furnace for forging after the holding time is up; Step 2: Use a wide flat anvil for forging , the amount of each reduction is 60-80mm, the full anvil is fed, after forging a stroke, rotate 180° for flat square forging, continue to feed the full anvil for one stroke, wait until the end of the forging stroke, rotate 90°, continue to fill the anvil Send another stroke for forging, and then rotate 180° until the forging of this stroke ends, and continue to feed forging with a full anvil for one stroke, thus transitioning from flat square forging to square forging. The present invention has the following advantages: 1) The technological process is short and the fire times are few. Only 1 to 2 fires are needed, and the technological process is obviously shortened, which is beneficial to reduce costs.

The invention relates to the field of profile forging of large forgings, and discloses a forming method and a forming device for large long-axis cross-shaped forgings. The prefabricated blank of this forming method does not need to be forged into a square section, which reduces the difficulty of the prefabricated blank, and adopts the method of segmented material division and forging and pressing simultaneously. Cross-shaped, compared with the traditional way of splitting the whole section and then pulling out, it requires fewer fires. It can use one fire to complete the steps that were completed in the previous two-fire forging. The forging efficiency is high and the pull-out can be reduced. The disadvantages of asymmetry and uneven shape caused to the forging during the long process.

The invention belongs to a forging method, and relates to a forging method for precisely controlling the bending and forming of a hook-shaped forging. Through forging billet design, free forging and membrane bending forging are combined, the designed forging billet is placed on the open end surface of the upper end of the die membrane, and the forging billet is bent and forged by pressing down the forging equipment to drive the pressure roller, and then the forging billet is placed On the open end face of the second upper end of the membrane, the positioning punch is driven by the forging equipment to bend the forging billet for a second step. When the forging billet touches the bottom surface of the membrane cavity, the bending forging is completed; the size of the base of the membrane and the size of the cavity Determined according to the shape and size of the bent forging. Through the above-mentioned design of the forging blank and the use of the special film, the precise bending and forming of the hook forging is completed, which ensures the integrity of the forging fiber streamline, reduces the number of fires for free forging, and improves the comprehensive performance of the forging.