53results about How to "Eliminate repetitive processes" patented technology

The invention discloses a spinning technique which comprises the steps that (1) compacted raw cotton is loosened into small cotton blocks or cotton bundles for convenient mixing and impurity removal, most impurities, defects and short fibers which are not suitable for spinning are removed from the raw cotton, and the raw cotton with different ingredients are mixed thoroughly and uniformly; (2) cotton rolls which have been processed by scotching are carded, purified and mixed into cotton bars through processes such as a licker-in, cylinders and flats, and a doffer, and the cotton bars are transmitted into a bobbin; (3) cotton neps, impurities and fiber defects in fibers are removed, and the fibers are further separated; (4) the 6-8 cotton bars are combined, and uneven long segments of the cotton bars are improved; and (5) rough yarns are drafted and fine-drawn into a demanded fineness and are then twisted, and fine yarns with a certain twist degree and strength are formed and wound on the bobbin.

The invention discloses a machining technique for an impeller of a ventilator. The machining technique includes the following steps: 1) material preparation; 2) rear disc positioning: fixing a rear disc on a platform; 3) point welding of vanes; 4) checking: checking if the perpendicularity of the vanes, the size of the vanes, and an outer circle of the vanes meet a drawing; 5) point welding of a front disc: performing point welding after alignment and compression; 6) checking: checking if the rotary direction and the size of the vanes meet the demands; 7) welding: firstly welding fillet weld joints between the vanes and the rear disc, secondly welding fillet weld joints between the vanes and the front disc, and performing symmetrical welding to ensure the flatness of the rear disc; 8) hub riveting; 9) shape correcting; 10) vibration aging processing; 11) lathing; 12) checking; 13) balancing; and 14) surface coating: clearing oil stains, excessive metal, burrs, and rust on a fan, performing surface coating according to the demands, and meeting the demands of products; the machining technique is simple, can avoid repeated processes, improve the working efficiency and the properties of all aspects, prolong the service life of the impeller of the ventilator, and enhance the market competitiveness.

The invention discloses a hot-dip galvanizing technology. The hot-dip galvanizing technology is characterized by comprising steps as follows: 1) degreasing; 2) pickling; 3) preparation of a dip plating aid; 4) drying and preheating; 5) hot-dip galvanizing; 6) arrangement: workpiece arrangement after plating mainly includes removal of surface residual zinc and zinc nodules and is mainly completed by the aid of a special vibrator for hot-dip galvanizing; 7) passivation: passivation is performed by the aid of chromate such as 80-100 g / L of Na2Cr2O7 and 3-4 ml / L of sulfuric acid; 8) cooling: water cooling is adopted, but the temperature cannot be too low or too high, and the temperature is generally not lower than 30 DEG C and not higher than 70 DEG C. The hot-dip galvanizing technology is simple, multiple repeated procedures are avoided, the working efficiency is improved, and the galvanizing effect is good.

The invention discloses a production machining process for an automobile half shaft. The process is characterized by including the following steps that (1) materials are selected and sheared, and meanwhile working allowance is determined, so that subsequent machining operation is facilitated; (2) die forging is carried out on the half shaft on an air hammer, and a swing grinder is used for swing-grinding of a cap; (3) the half shaft is subjected to shot blasting; (4) a blank rod is straightened, and the perpendicularity is guaranteed; (5) the small end is roughly turned, and rough turning and finish turning are carried out through a hexagonal capstan lathe or a profile lathe; (6) a large hole is turned, end face flattening is a key procedure for increasing the half shaft production line productivity, and end face milling through a plunge-cut method is good; (7) the large end is subjected to rough turning and finish turning, and the small end is subjected to finish turning; (8) a spline is subjected to cold rolling; and (9) thermal treatment is carried out on the half shaft, heating is started until the set temperature of an electric furnace reaches 840-860 DEG C, chlorine gas is led to the furnace for clearing the furnace for about 30 min, the protective atmosphere is led into the furnace, heat preservation is conducted for 60 min, cleaning is conducted with half-quenching oil at the temperature of 30-80 DEG C, tempering is carried out at the temperature of 550-650 DEG C, heat preservation is conducted for 120 min after tempering, and discharging is conducted after cooling.

The invention discloses a nitridation process for a worm gear. The nitridation process is characterized by comprising the following steps: (1) clamping a to-be-nitrided worm gear on a special tool, hoisting the to-be-nitrided worm gear to a preheated cleaning pool for cleaning via a crane, then directly putting the cleaned to-be-nitrided worm gear into a preheating furnace with a temperature of 300 DEG C, carrying out preheating for 2 h, then heating the preheating furnace to 480 DEG C and carrying out preheating for 2 h; (2) carrying out nitridation which refers to filling of mixed gas consisting of ammonia gas and nitrogen and comprises two phases, wherein in the first phase, the worm gear is maintained at a temperature of 510 to 520 DEG C for 10 h and an ammonia decomposition rate is 18 to 25%, and in the second phase, the worm gear is maintained at a temperature of 510 to 520 DEG C for 10 h, the ammonia decomposition rate is 30 to 50% and cooling in furnace to 200 DEG C and air cooling out of the furnace are successively carried out; and (3) after completion of nitridation, hoisting the worm gear to a post-nitridation cleaning pool for cooling via the crane, then hoisting the worm gear to a hot-water cleaning pool for cleaning in 8 to 10 min, maintaining the worm gear in the hot-water cleaning pool for 10 min and then hoisting the worm gear in the air so as to allow the worm gear to be rapidly dried. The nitridation process is simple, omits a plurality of repeated procedures, improves work efficiency and enables the overall performance of the worm gear to be greatly improved.

The invention discloses a crankshaft machining process which is characterized by including the steps of machining blanks by an end face milling and centering special machine, feeding and detecting the blanks on line, then successively machining the blanks by a thrust journal cylindrical turning special machine or numerical control lathe, a thrust journal cylindrical grinding machine, a main journal rough-machining special machine or numerical control lathe, a two-end journal rough machining special machine or numerical control lathe, a connecting rod journal rough-machining universal device with eccentric fixture, special machine, an external milling or internal milling machine, an oil hole machining universal device or special machine, a intermediate cleaning machine, a heat treatment special machine or special tooling, a straightening special machine, a thrust surface grinding special machine, a journal grinding special machine, a special machine or machining center for machining threaded holes and positioning pin holes at two ends, a key milling universal device or special machine, a dynamic balancing special machine, a flaw detection special machine, a polishing special machine, a cleaner, and finally discharging and inspecting products. The crankshaft machining process is simple. As multiple repeated procedures are omitted, work efficiency is improved.

The invention discloses a spindle box gear heat treatment technology. The technology comprises blanking, blank forging, normalization, rough machining, hardening and tempering, fine finishing (gear hobbing), high frequency induction heating quenching, low temperature tempering and grinding. The technology has simple processes, is free of many repeated processes and improves work efficiency.

The invention discloses a heat treatment process for bearing steel. The heat treatment process is characterized by comprising the following steps: 1) normalizing: as for a chromium bearing steel normalizing process, after a workpiece is thoroughly heated, the workpiece is maintained at the temperature for 40 to 60 min, cooling is rapidly carried out, and spheroidizing annealing is immediately carried out after normalizing; 2) spheroidizing annealing: the workpiece is heated to 900 to 920 DEG C before annealing, the temperature of the workpiece is maintained for 2 / 3 to 1 h before normalizing, and heat preservation time depends on the size of the workpiece, uniformity of a heating furnace, a charging method, a charging amount and uniformity of an original structure before annealing; 3) quenching: quenching temperature of Cr15 steel is in a range of 820 to 860 DEG C, a critical oil quenching diameter is 25 mm, an oil quenching manner is used, the heating and heat preservation time of Cr15 steel is longer than the heating and heat preservation time of alloy tool steel, the heating coefficient of a salt bath is 0.8 to 1.5 min / mm, and the heating coefficient of an air furnace is 1.5 to 2 min / mm; and 4) tempering: tempering is carried out at a low temperature of 460 + / - 10 DEG C for 2 to 4 h. The process provided by the invention is simple, omits a great number of repeated procedures and has improved work efficiency.

The invention discloses a pouring technology for bearing alloy. The pouring technology comprises the steps of 1, fully stirring alloy liquid before pouring, leaving the alloy liquid to stand for 2-4 minutes and clearing dross, wherein the pouring temperature of tin-antimony alloy ranges from 400 DEG C to 440 DEG C; 2, preheating all pouring tools to 150-200 DEG C before pouring and taking out dies preheated to 270-300 DEG C; 3, in the pouring process, guaranteeing that the temperature of the inner surfaces of the dies is always higher than the temperature of a steel shell bearing bush surface because the temperature decides the condensation direction of the liquid alloy; 4, for completing the pouring process, placing a die base on a platform before pouring, immediately pouring molten babbitt metal into an iron ladle preheated to 270-300 DEG C for carrying out casting after preparation work is completed, controlling the speed to be low at the initial stage of pouring, gradually increasing the speed and cooling the alloy through quenching and slow cooling after pouring is completed.

The invention discloses an electrostatic spraying process. The process is characterized by comprising the following steps that (1) pretreatment is carried out, specifically, deoiling, derusting, phosphorization and passivation are carried out; (2) a layer of powder coating is evenly sprayed to the surface of a workpiece through the electrostatic adsorption principle, and falling powder is recovered through a recovery system and then screened and reused; and (3) high-temperature curing is conducted, specifically, the workpiece coated with the powder coating is pushed into a curing oven and heated to a preset temperature, generally 185 DEG C, then heat preservation is conducted for 15 minutes, and a finished product can be obtained after the workpiece is taken out of the oven and cooled. According to the process, the method is simple, multiple repeated procedures are omitted, and work efficiency is improved.

The invention discloses a heat treatment process for 20CrMnTi gear steel. The heat treatment process for the 20CrMnTi gear steel is characterized in that the process includes the following steps that (1) blanking is performed, (2) forging is conducted, (3) normalizing is carried out, specifically, the heating temperature is 920 to 950 DEG C, heat preservation is performed for two to three hours, and then air cooling is performed; (4) machining is conducted; (5) cleaning is carried out; (6) carburizing is performed, specifically, gas carburizing is performed, the heating temperature is 900 to 920 DEG C, the heat preservation time is calculated according to 0.15 to 0.2 mm / h, and the heating temperature does not exceed 920 DEG C; (7) quenching is conducted, specifically, the heating temperature is 860 to 900 DEG C, heat preservation, oil cooling and vertical quenching into oil are performed in sequence, a large part is quenched into oil firstly, up-and-down movement is conducted after quenching into oil, and proper horizontal movement cooperates so as to improve the cooling speed of a workpiece; (8) tempering is performed, specifically, the heating temperature is 500-650 DEG C, heat preservation is performed for two hours, and then oil cooling is conducted; and (9) cleaning is carried out. The gear steel fabricated through the process is high in strength, good in tenacity and high in fatigue resistance.

The invention discloses a stainless steel passivating technique. The stainless steel passivating technique comprises the following steps that deoiling is conducted, and deoiling and rust removal are conducted before processing; rinsing is conducted, and a deoiling agent is cleaned away; activating is conducted, KM0206 serves as activating liquid, and parts subjected to machining such as welding or rolling or heat treatment are subjected to acid pickling before passivating so that oxide skin can be completely removed and metallic matrices can be exposed; rinsing is conducted, and the activating liquid on the surfaces of the parts is cleaned away; passivating is conducted, the parts are soaked in stainless steel passivating liquid for over 30 minutes at the normal temperature, and preferably, soaking is conducted for 60 minutes; rinsing is conducted, the passivating liquid left on the surfaces of the workpieces is cleaned away; neutralizing is conducted, and caustic soda flakes with the concentration being 5% are used for neutralizing; rinsing is conducted, and neutralizing liquid left on the surfaces of the workpieces is cleaned away; pure water is put into use, and due to the fact that impurities are contained in ordinary tap water, impurities and water stains can be removed through the pure water; and drying is conducted, and the workpieces are dried through a drying oven at the temperature being lower than 180 DEG C or aired.

The invention discloses a coating technology which is characterized by comprising the steps that (1) coating production is organized and arranged according to coating production plan list, a material requisition list is filled, and used materials are received; (2) each position is arranged to check equipment and check whether a workshop environment can satisfy operational requirements; (3) a coating head operator adjusts a scraper gap according to requirements of a coated product, locks the position of the scraper, installs a filter net and loads the materials; (4) a coating team leader sets a temperature according to technological requirements of the coated product, and air exhaust is started preferentially; (5) an upper coating base film is installed, and front and rear unreeling tensions are adjusted to satisfy technologically required values; (6) when a temperature of a drying oven required by the coating technology is reached, the materials are filtered, a machine is switched on, and coating is started; (7) an operator monitors surface quality of the coating at the machine tail constantly and makes adjustment in time; and (9) when the coating operation is started, the speed shall be changed slowly, and the speed can be slowly accelerated to a technologically stipulated speed when thickness and the surface quality are qualified. The coating technology method is simple and has the advantages that a lot of repeated processes are omitted; and working efficiency is increased.

The invention discloses a casting core manufacturing process. The casting core manufacturing process is characterized by comprising the following steps that (1) an operator of a workshop gets a qualified core box from a mold warehouse according to related procedures and cleans the core box and gives the core box back in time after use; (2) molding sand is prepared, specifically, sand for molding of a brake disc includes facing sand and floor sand; according to the matching of the facing sand, quartz facing sand includes quartz sand and argil at the ratio of 5:1, and pulverized coal facing sand includes quartz sand, argil and pulverized coal at the ratio of 5:1:(1-3); the granularity and strength of the facing sand need to be guaranteed during mixing, and the matching ratio needs attention during mixing of the floor sand; and (3) a cavity needs to be cleaned thoroughly before core setting. The casting core manufacturing process is simple, many repeated procedures are omitted, and the work efficiency is improved.

The invention discloses a steel wire surface treatment process. The process comprises the following steps that (1) acid pickling is conducted, steel wires are soaked in a hydrochloric acid tank for about 15 min at a room temperature, and in this process, hydrochloric acid in the hydrochloric acid tank is stirred continuously with the steel wires so as to accelerate acid pickling to achieve the effect that no oxidized scales are generated; (2) the steel wires are washed with high-pressure water; (3) the steel wires are subjected to phosphorization; (4) the steel wires are washed with high-pressure water, residual phosphating solutions are stopped from entering a saponification tank, and in the process, a valve of a phosphorization tank is closed, and a valve of the saponification tank is opened; and (5) the steel wires are subjected to saponification, the saponification temperature is 75-85 DEG C, and the saponification time is 2-5 min. The surface of each steel wire subjected to saponification is provided with a milk-white film.

The invention discloses a harmless salt bath nitrocarburizing technology. The technology comprises 1, cleaning, 2, workpiece preheating to a temperature of 300-350 DEG C, 3, salt bath nitridation: carrying out salt bath nitridation at a temperature of 525-580 DEG C and carrying out thermal insulation for 70-180min, 4, oxidation: carrying out oxidation at a temperature of 350-400 DEG C and carrying out thermal insulation for 5-10min, 5, polishing: carrying out mild mechanical polishing, comminution or vibration finish machining to obtain desired surface roughness, 6, secondary oxidation: carrying out secondary oxidation at a temperature of 350-400 DEG C, 7, cleaning and 8, immersion in oil. The technology has simple processes, is free of many repeated processes, improves work efficiency and improves workpiece performances.

The invention discloses a manufacturing process for a fuel oil tank. The manufacturing process for the fuel oil tank is characterized in that the manufacturing process comprises the following steps of 1, plate processing and blanking; 2, box body splice welding; 3, derusting and cleaning; 4, penetrant inspection; 5, oil tank sealing and blocking; 6, spray testing; and 7, interior oil coating. According to the manufacturing process for the fuel oil tank, the machining efficiency is improved, the yield is increased, and the production cost is reduced; technical effects unexpected by technical personnel in the field are achieved, the long-term design stereotype is overcome, and a novel design and machining idea is provided; and compared with the prior art, a better machining effect is achieved.

The invention discloses a surface treatment process for a wire rod. The surface treatment process is characterized by comprising the following steps: 1) acid pickling, wherein the density of a hydrochloric acid pool is no less than 120; 2) water scrubbing and swinging twice to three times; 3) flushing with high pressure water so as to totally remove residual acid; 4) phosphatization, wherein the total acidity of a phosphatization pool is 120 to 180 points, free acid is 10 to 20 points, total zinc amount is 40 to 60 g / L, temperature is greater than 65 DEG C, and phosphatization time is 2 to 10 min; 5) flushing with high pressure water; 6) saponification, wherein the temperature and pH value of a saponification pool is no less than 85 DEG C and 8 respectively; and 7) natural drying. The process provided by the invention is simple, omits a plurality of repeated procedures and improves work efficiency.

The invention discloses a sand box molding process. The sand box molding process comprises the following steps that 1, molding is conducted, specifically, (1) when molding is conducted through an iron sand box, the sand box is positioned through positioning pins and smoothly put onto a mold plate; (2) when molding is conducted, molding sand must be screened through a screen and then is added into the sand box; (3) air hole pricking is conducted, and not less than two air holes are pricked per 100*100 square millimeters; and (4) a layer of sand with the thickness being 10-20 mm is paved on the mold placing ground and scraped to be uniform through a sand scraping toothed plate, a lower leaf is smoothly put on the sand, and after loose face sand on the surface is blown off through a bellow, smooth box closing is conducted; and 2, box closing is conducted, specifically, (1) whether male pin bodies and female pin bodies of the sand box in each furnace are misplaced or not is checked to prevent mismatch; (2) a core needs to be carefully checked before core setting, and after core setting is conducted, the core is blown again through air; and (3) when box disengaging is conducted, the sand box needs to be lightly smashed to prevent mismatch and sand dropping, and if the sand box cannot be disengaged easily, the inner wall of the sand box is appropriately coated with a thin layer of release agent. According to the sand box molding process, the process is simple, a lot of repetitive processes are omitted, and the working efficiency is improved.

The invention discloses a processing technology of a plate spring. The processing technology is characterized by comprising the following steps of (1) performing blanking, firstly cutting a block of large steel plate into bar-shaped steel strips, and then cutting the steel strips into steel blocks of different required lengths; (2) performing alignment; (3) performing punching: punching center holes and end holes, and finally fixing the steel blocks of different lengths together, so as to prevent displacement and be convenient for fixation and mounting; (4) performing edge cutting: removing large burrs, and then performing bending, lug scrolling, and lug coating; (5) performing shaping; (6) performing heating, wherein heat treatment is performed on a general plate spring at about 1100 DEG C; (7) performing forming; (8) performing quenching and tempering; (9) performing shot blasting; and (10) spraying paint and performing drying so as to prevent the surface of the plate spring from being subjected to an oxidation reaction with air and moisture outside, and alleviate corrosion velocity of the plate spring. The technological method is simple, and many repeated working procedures are omitted, so that the working efficiency is improved.

The present invention discloses a resin sand casting process, the resin sand casting process is characterized by comprising the following steps, to be more specific, 1) preparing, to be more specific, whether waste sand in a molding machine is cleaned up is checked, a switch is clicked, whether equipment operation is abnormal is checked, and whether each equipment is abnormal is checked according to the process opposite to the technical process; 2) distributing boxes; 3) molding; 4) drawing from a mold; 5) spraying paint and flow coating; 6) setting a core and closing a box; and 7) casting and knocking the box, to be more specific, a 0.5T casting ladle is used for casting, a thick-walled casting is casted with a first packet of molten iron, casting time and a gap between the sand boxes are grasped, when in casting, a wooden stick is used for igniting exhaust at a gas outlet and a riser, 12 hours after the casting, the box is opened, when the box is knocked, a special casting riser is left after shot blasting and sand removal, and after 1 / 3 of the root of the riser is rubbed off by a grinding wheel plate, the special casting riser is knocked down, in the manner, peeling off can be prevented, and when a casting water nozzle is cleaned up, the casting is not allowed to be damaged when the casting is provided with burrs. The casting process is simple, many repetitive processes are eliminated, and work efficiency is improved.

The invention discloses an iron piece chemical nickel plating process. The process is characterized by comprising the steps of: 1) degreasing: heating a 5%-10% degreasing powder to 65-70 DEG C and soaking for 5-10 min; 2 ) washing with water; 3) pickling and activating; 4) washing; 5) chemical plating: rinsing the workpiece, heating to 85-90 DEG C and conducting plating for 10-20 min; 6) washing: washing in a water tank, or rinsing with tap water, and washing off the plating liquid on the workpiece; 7) passivating by a 5% potassium dichromate[ dichromate or chromic anhydride for 1-3 min, wherein the discoloration of the coating is prevented, and the passivation solution is at room temperature, and does not need heating; 8) washing: cleaning the remaining passivation solution on the workpiece; 9) washing by pure water to prevent the watermark and other residues on the workpiece, and heating the pure water to 80-100 DEG C; and 10) drying by an oil-free air compressor air gun, or stoving. The process is simple, eliminates a lot of repetitive processes, and improves work efficiency.

The invention discloses a stainless steel casting purification process. The stainless steel casting purification process is characterized by comprising the following steps: 1) shot blasting: a Q326 track type shot blasting machine is adopted; a 0.3 mm stainless steel shot is used; and redundant sand and scales are removed; 2) flushing: a lifting basket, a water gun and running water are used; 3) acid washing: in an acid washing tank, acid washing liquid is prepared by 10% of nitric acid, 5% of hydrofluoric acid and 85% of water; the acidifying time is 30-60 minutes; and the temperature is 40-60 DEG C; 4) flushing: the lifting basket, the water gun and hot water of 40-60 DEG C are adopted; 5) shot blasting: the Q326 track type shot blasting machine is adopted; and the 0.3 mm stainless steel shot is used; 6) flushing: the lifting basket, the water gun and the running water are used; and 7) purification: purification water is used in a purification tank for cleaning; purification liquid is prepared by 10% of nitric acid, 5% of hydrofluoric acid and 85% of water; the acidifying time is 15-30 minutes; and the temperature is 40-60 DEG C. The purification process is simple, saves multiple repeated procedures, improves the working efficiency, and is excellent in purification effect.

The invention discloses a concrete surface sand blasting process, which is characterized by comprising the following steps of base layer cleaning: before the sand blasting, dust on the wall surface of the base layer needs to be firstly cleaned; small holes are repaired; and if a release agent exists on the surface of the base layer, the release agent needs to be cleaned up and brushed by a steel wire brush; wall surface moisturizing: after the base layer is cleaned up, the wall surface is sufficiently wetted through water spraying, and the depth is about 3mm; and the wall surface needs to be in an inner wet state before the sand blasting; material preparation: a sand blasting material needs to be prepared according to the mixture ratio of powder to sand being 1 to (1.5-2.0); a special sand blasting glue is added; and the mixture is uniformly stirred; sand blasting construction: the pressure of an air compressor during the construction is not smaller than 8MPa; and maintenance. The sand blasting process has the advantages that the steps are simple; many repeated work procedures are omitted; and the work efficiency is improved.

The invention discloses a magnetic steel heat treatment technology. The magnetic steel heat treatment technology comprises 1, casting blank annealing: putting a casting blank into a high temperature furnace at power of 26KW, carrying out furnace heating to a temperature of 11000 DEG C, carrying out thermal insulation for 1-2h and carrying out furnace cooling, and 2, product heat treatment: a, middle temperature preheating, b, high temperature solid solution, c, magnetic field air quenching or magnetic field air cooling, d, low temperature preheating: carrying out demagnetization on a product subjected to solid solution and air quenching, putting the product into a stainless steel small box, feeding the stainless steel small box with the product into a box-type resistance furnace, carrying out preheating at a temperature of 600-6500 DEG C and carrying out thermal insulation for greater than or equal to 20-30min, e, magnetic field isothermal treatment, f, multistage ageing and tempering and g, cooling to a temperature of about 2000 DEG C or less after tempering and then discharge. The magnetic steel heat treatment technology has simple processes, is free of repeated processes and improves work efficiency.

The invention discloses a production process of tungsten carbide, which is characterized in that it comprises the following steps: batching → mixing → carbonization → ball milling → screening → batching → inspection. The production process of the tungsten carbide is simple, eliminating many repetitive processes and improving work efficiency.

The invention discloses a low-pressure casting process. The process is characterized by comprising the following steps that (1) tools and materials are prepared, a mold coating agent is fully stirred before being used, whether ventilation of a mold baking device is uniform is checked, the air leakage phenomenon in the position of a connector is avoided, whether a spray gun leaks must be checked firstly, and sealing gaskets, filter screens and high-temperature-resistant lubricating oil are prepared; (2) a mold is prepared; (3) molten aluminum is prepared, and according to the requirements for the molten aluminum, the measured hydrogen density of the molten aluminum is not smaller than 2.45 g / cm<3>, the temperature of the molten aluminum is controlled according to requirements of a low-pressure production operation instruction, complete slagging-off must be conducted before and after the molten aluminum is added into a holding furnace, the storage time of the molten aluminum in the holding furnace is not longer than 4 h, and use of the molten aluminum is prohibited if the storage time is longer than 4 h; and (4) the mold opening temperature is required to reach 380-450 DEG C, the mold is closed for temperature uniformizing for 3-6 min, and the mold is opened into 3 pieces for making pouring rejected products, so that the temperature is balanced, and the mold temperature is increased. The low-pressure casting process is simple, multiple repeated procedures are omitted, and work efficiency is improved.

The invention discloses a thermal treatment process for a weld of an intermediate-diameter alloy pipeline. The thermal treatment process is characterized in that the process includes the following steps of (1) preparation before welding, (2) preheating before welding and (3) welding; in the step of welding, firstly, thermocouples are symmetrically arranged on the two sides of the weld edge of the welded pipeline, when thermal treatment is carried out, a rectangular heating piece is unfolded and surrounds the weld for a circle, a 16# iron wire is used for binding the rectangular heating piece, and a heater is attached to the pipeline wall; secondly, as for the weld in the horizontal fixed position, the heat preservation thickness of the lower portion should be slightly larger than that of the upper portion, the temperature is increased to a heating temperature and is basically uniform, constant-temperature time starts to be calculated when the temperature difference is smaller than 50 DEG C, and in the cooling process, operation is conducted. The thermal treatment process is simple, multiple repeated procedures are omitted, and work efficiency is improved.

The invention discloses a pouring technology for castings. The pouring technology is characterized by comprising the steps of 1, preparing; 2, pouring and 3, production safety protecting; in the preparing step, whether casting ladles are dried, whether sprue mouths are smooth and flat, whether slag collection agents are prepared completely, whether slag removing tools are prepared and whether products needing chilling block addition are prepared completely are inspected before pouring everyday; in the pouring step, a first molten iron ladle discharged from a furnace is used for pouring unimportant castings, waste castings replace chilling blocks, the slag collection agents are uniformly scattered over molten iron of each casting ladle, a slag remover removes slag on the sprue mouths, and the height from ladle spouts to sprue cups is generally controlled to be within 150-200 mm; in the production safety protecting step, workers need to wear labor protection appliances before working, need to operate safely and reliably in the ladle pouring process, do not fill the casting ladles with too much molten iron when receiving the molten iron, need to concentrate on the pouring process without glancing at feeder heads, need to move gently with carefulness and discretion when handling weights and shifting boxes and need to clear sites after pouring is completed. The pouring technology has the advantages that the method is simple, a plurality of repeated processes are eliminated, and the work efficiency is improved.