22 results about "Gray iron" patented technology

The anti-deformation casting technology comprises the following steps that S1, a mold is pretreated, specifically, a, a thick-wall area and a thin-wall area are recognized according to a casting three-dimensional model, and a high-heat-conduction material insert is embedded into the mold corresponding to the thick-wall area; a low-heat-conduction material insert is embedded into the mold corresponding to the thin-wall area; b, a casting mold is preheated to 180-250 DEG C, and an anti-burnt-on sand coating is evenly sprayed on the inner surface of the mold; s2, low-pressure mold filling pouring is conducted, specifically, molten metal liquid is injected into a mold in a low-pressure mold filling mode; s3, solidification and vibration aging treatment, wherein the thick-wall area of the casting is solidified to 50%-70%; and S4, demolding treatment is conducted, specifically, the casting is demolded, and the casting is transferred into an argon protection heat preservation furnace after demolding. Through the synergistic effect of differential cooling control, stepped pressurization solidification and directional vibration aging, micro plastic deformation can occur in the casting, residual stress is homogenized, the dimensional stability of the gray iron casting is further improved, and deformation of the gray iron casting is reduced.

The invention provides high-phosphorus wear-resistant gray cast iron and a production method thereof, and belongs to the technical field of high-phosphorus wear-resistant gray cast irons.The production method comprises the following steps that raw materials are inspected; smelting is conducted, specifically, waste steel, gray iron foundry returns, pig iron, a carburant and ferrophosphorus are sequentially put into an electric furnace to be melted; nickel, chromium and copper are sequentially added into the electric furnace, and the molten iron is quenched and tempered, so that the final components of the molten iron meet the requirements; molding: preparing a casting mold; a casting ladle is preheated, meanwhile, an inoculant is placed at the bottom of the casting ladle, then molten iron is poured into the casting ladle, and the inoculant is added along with flow in the process that the casting ladle conducts casting into the mold; box opening: the box is opened after the temperature is reduced, and the formed high-phosphorus wear-resistant gray cast iron is obtained; and performing heat treatment: performing high-temperature annealing on the high-phosphorus wear-resistant gray cast iron, and inspecting the casting to obtain a final finished product. According to the technical scheme, the purpose of improving the abrasion resistance and the mechanical performance of the gray cast iron is achieved.

The utility model discloses a gray iron piece vortex machining clamping tool, which comprises a first clamping tool and a second clamping tool, the first clamping tool comprises a first vertical chuck, a first clamping jaw, a first mounting plate and a first backer, and the second clamping tool comprises a second vertical chuck, a second clamping jaw, a second mounting plate and a second backer. A working procedure workpiece is placed on the first backer, the clamping rod is pressed into the clamping groove downwards, the first clamping jaw applies pressure towards the inclined lower portion to the working procedure workpiece to fix the working procedure workpiece, after front face machining of the working procedure workpiece is finished, the working procedure workpiece is transferred and placed on the second backer, the position of the second clamping jaw is adjusted, and the working procedure workpiece is clamped by the second clamping jaw. The overall structure and operation are simple, the tool remodeling cost is low, the remodeling time is short, the machining procedures can be simplified conveniently, the size precision of the procedure workpieces is stable, and the equipment input cost and the labor cost are effectively reduced.

The invention belongs to the technical field of cast iron plating, and particularly relates to a gray iron ductile iron laser cladding interlayer composite material and a preparation method thereof.The interlayer composite material comprises, by weight, 7-10 parts of alloy powder, 0.5 part of boron nitride, 4-6 parts of ceramic powder, 2 parts of flexibilizer, 0.4 part of yttrium oxide and 0.5-1.5 parts of PMMA. A porous ceramic coating is deposited on a gray iron matrix through a plasma spraying process to buffer thermal tension and prevent the risk of gray iron cracking, and then a laser cladding layer comprising a fusion layer and a barrier layer is plated based on a laser cladding process, so that gray iron and ductile iron are matched in thermal expansion, corrosion and brittle rupture are avoided, and the bonding strength and integrity of the bimetallic plate are guaranteed.

The invention discloses a gray iron casting alloy, a brake drum and a casting method of the gray iron casting alloy, and the gray iron casting alloy comprises the following chemical components in percentage by mass: 3.5%-3.55% of C, 1.8%-2.0% of Si, 0.85%-0.9% of Mn, 0.08%-0.12% of S, less than or equal to 0.12% of P, 0.29%-0.34% of Cr, 0.18%-0.2% of Cu and the balance of Fe and inevitable impurities. Wherein the mass ratio of Mn to S is (7.5-10.6): 1, and the mass ratio of Si to C is (0.51-0.56): 1. The gray iron casting alloy does not contain rare elements, and is low in cost and excellent in thermal fatigue performance, and the brake drum cast by using the alloy is excellent in thermal fatigue performance, long in service life and high in casting process inclusiveness.

The utility model discloses an automobile die based on ductile iron and gray iron composite casting technology, which relates to the technical field of automobile dies and comprises an upper die fixing plate and a lower die fixing plate, an upper die is arranged below the upper die fixing plate, a lower die is arranged on the lower die fixing plate, and a closed forming cavity is formed between the upper die and the lower die when the upper die and the lower die are clamped. A placement groove is formed in the lower mold, guide supporting structures are arranged on the two sides of the lower mold respectively, a positioning key groove is formed in the placement groove, an injection molding channel is formed in the lower mold and communicates with the forming cavity, and a heat conduction groove is formed in the upper mold and communicates with and wraps the upper portion of the forming cavity.

A method of refurbishing a steel-shell brake drum that includes superheating a worn-out brake drum until the worn-out brake drum is glowing hot. The worn-out brake drum includes a steel shell and a worn-out, gray-iron layer bonded to an inside surface of the steel shell. The method further includes centrifugal casting additional molten iron to the gray-iron layer to increase the radial thickness of the gray-iron layer.

The invention relates to a friction brake body (1) for a wheel brake (8) of a motor vehicle, having a base body (5) which is manufactured from grey cast iron. The base body (5) has at least one friction contact surface (2, 3) with a wear protection layer (6, 7), and the wear protection layer (6, 7) has a stainless steel matrix with hard material particles. According to the invention, the wear protection layer (6, 7) has a plurality of agglomerates (13) of hard material particles (12), and the agglomerates (13) are infiltrated by the stainless steel matrix.

The utility model provides a gray iron casting cleaning machine which comprises a box body, a rotating door arranged in the box body, a cleaning mechanism arranged in the box body, and a moving mechanism arranged in the box body. According to the gray iron casting cleaning machine, a double-head motor drives an extension sleeve to be connected with an extension rod to rotate towards one side, so that a transmission piece drives a rotating rod to be connected with a rotating disc to rotate towards one side, and then a vibration block, a vibration hole, a filter box, a reset groove, a reset block and a reset spring are matched, so that the filter box vibrates; the shot materials falling into the filter box are filtered, the filtered shot materials can be discharged through the guide box, large chippings can fall into the filter box to be stored, small chippings can enter the collecting box to be stored, and therefore the shot materials in the chipping box are separately stored, the filter box is prevented from being blocked, and meanwhile the shot materials in the chipping box can be collected. And later unified treatment is also facilitated.

The invention relates to the technical field of gray iron casting polishing, and particularly discloses a positioning and polishing structure for gray iron castings, which comprises a base, blanking parts are fixedly connected to two sides of the base, polishing parts are fixedly connected to the middle parts of the side surfaces of the two blanking parts, and a transmission part is fixedly connected to the inner side of the base; the collecting component is used for collecting chippings generated during grinding, and positioning components are fixedly connected to the two sides of the top of the collecting component; the positioning part comprises a positioning frame, a second driving part is fixedly connected to the side face of the positioning frame, three positioning shafts are evenly arranged on the side, away from the second driving part, of the positioning frame, one ends of the two positioning shafts located on the two sides are slidably connected with the positioning frame, and the end, close to the positioning frame, of the positioning shaft located in the middle is fixedly connected with the output end of the second driving part. The end, away from the positioning frame, of the positioning shaft is fixedly connected with a clamping mechanism. According to the device, gray iron castings of different shapes and sizes can be adaptively adjusted, and the device is high in universality, high in flexibility and high in automation degree.

A method of refurbishing a steel-shell brake drum that includes superheating a worn-out brake drum until the worn-out brake drum is glowing hot. The worn-out brake drum includes a steel shell and a worn-out, gray-iron layer bonded to an inside surface of the steel shell. The method further includes centrifugal casting additional molten iron to the gray-iron layer to increase the radial thickness of the gray-iron layer.

The invention relates to a brake disc (12) for a motor vehicle, said brake disc comprising a main body (20) made of a gray cast iron alloy and comprising a coating (22), wherein the coating (22) comprises different concentrations of hard materials in different regions.

The application provides a feeding process of a gray iron flywheel structure and belongs to the field of gray iron flywheel casting. The bottom surface of a sprue cup is connected with a vertical sprue, the two ends of the bottom of the vertical sprue are connected with horizontal sprues, a casting is installed on the horizontal sprues, a top cold riser is installed on the top of the casting, an internal cold riser is installed on the inner ring of the casting, and a local drop surface is arranged on the inner ring of the casting. The application solves the problem that the inner ring of the flywheel cannot sequentially solidify and shrinkage remains in the prior art, the top cold riser supplements liquid to the casting, the outer ring of the flywheel is fed, thereby reducing the insufficient casting and shrinkage deformation of the top of the flywheel, the internal cold riser design can specifically feed the inner ring of the flywheel, and the local drop surface enables the inner ring of the flywheel to sequentially solidify when solidifying. Through the above process, the inner ring of the flywheel is sequentially fed and solidified when self-solidifying, internal shrinkage remains are avoided, and it is ensured that the inner ring of the flywheel has no shrinkage remains.

According to the positioning polishing table for the gray iron casting, an internal partition plate is arranged in an external working box body, an auxiliary rotating groove is formed in the top face of the internal partition plate, a detection auxiliary mechanism, a cooling treatment mechanism, a material fixing mechanism and a cleaning mechanism are all arranged in the external working box body, and a first universal driving motor is arranged at the bottom of the internal partition plate; the circular rotating disc is arranged in the auxiliary rotating groove, connecting supporting columns are arranged at the two ends of the top of the circular rotating disc, and a material bearing plate is arranged at the top ends of the two connecting supporting columns. An auxiliary rotating groove is formed in the top face of the inner partition plate, a precise rotating track is provided for the circular rotating disc, it is ensured that the circular rotating disc is kept stable in the rotating process, shaking and deviation are reduced, and therefore the material fixing accuracy and the grinding precision are improved, movement of materials in the rotating process is more stable and controllable, and the grinding efficiency is improved. And high-quality grinding operation can be realized.

This invention relates to the field of lost foam casting technology and provides a method for solving the porosity problem in gray iron casting. A necked ceramic tube is added to the lower end of the sprue, utilizing its "liquid seal-stabilized flow" characteristics to keep the pouring cup continuously filled. When molten iron flows in, the flow velocity at the neck increases, reducing the chance of gas entrapment and maintaining a stable molten iron level in the pouring cup, preventing air from entering the mold cavity. Venting is enhanced by adding a dedicated venting pipe to the bottom of the mold: a foam sprue is connected to the bottom slag discharge channel, covered with a paper ceramic tube, and then a steel pipe is fitted over the paper ceramic tube, with sand tightly packed between the paper ceramic tube and the steel pipe. Isolated bosses are connected to the main mold using foam material, enabling continuous molten iron filling. Through the synergistic effect of these three elements, this invention effectively controls porosity defects in gray cast iron parts, significantly reducing customer complaints and demonstrating significant engineering application value.

The invention consists of a gray cast iron comprising carbon, silicon, vanadium, manganese, nickel, chromium, molybdenum, copper, sulfur, phosphorous, tin and titanium, wherein: the percentage by weight of carbon is from 3.70 to 3.90%; the percentage by weight of silicon is from 1.30 to 2.10%; the percentage by weight of vanadium is from 0.10 to 0.15%; the percentage by weight of manganese is from 0.60 to 0.90%; the percentage by weight of nickel is from 0.05 to 0.50%; the percentage by weight of chromium is from 0.20 to 0.35%; the percentage by weight of molybdenum is no more than 0.10%; the percentage by weight of copper is no more than 0.35%; the percentage by weight of sulfur is less than 0.10%; the percentage by weight of phosphorous is less than 0.10%; the percentage by weight of tin is less than 0.10%; the percentage by weight of titanium is no more than 0.01%; the remainder by weight being iron.

The utility model discloses a shot blasting device for gray iron castings, which comprises a treatment box, a left channel shell fixedly connected to the left surface of the treatment box, a left motor fixedly connected to the upper surface of the left channel shell, a left auger fixedly connected to the output end of the left motor, and a right channel shell fixedly connected to the right surface of the treatment box, the upper surface of the left channel shell is fixedly connected with a left motor, the upper surface of the right channel shell is fixedly connected with a right motor, the output end of the right motor is fixedly connected with a right auger, the right surface of the left channel shell and the left surface of the right channel shell are both provided with inlets, the right surface of the left channel shell and the right surface of the right channel shell are both provided with outlets, and the front inner wall and the rear inner wall of the treatment box are fixedly connected with flow guide plates. The lower surface of the flow guide plate is connected with a conveying pipe, the end, away from the flow guide plate, of the conveying pipe is fixedly connected with an impeller head, the front inner wall and the rear inner wall of the treatment box are fixedly connected with mounting plates, the front inner wall and the rear inner wall of the treatment box are fixedly connected with filter plates, and the left inner wall and the right inner wall of the treatment box are slidably connected with collecting bins.

The invention discloses an all-steel pulley for an elevator, which relates to the technical field of elevator transmission parts and comprises a steel spoke supporting surface, a working surface and a metal bearing chamber, the working surface is annular, and the working surface is fixedly arranged on the outer ring of the steel spoke supporting surface in a sleeving manner; the metal bearing chamber is fixedly connected with the steel spoke supporting surface through a stretching, spinning, riveting or welding process, and the steel spoke supporting surface, the working surface and the metal bearing chamber are all made of steel. The working face is made of steel materials, has better toughness and strength compared with gray iron and steel, can effectively bear impact loads caused by frequent starting, stopping and operation vibration of an elevator, greatly reduces the risk of breakage of the pulley in the using process, prolongs the service life of the pulley, and provides reliable guarantee for long-term stable operation of the elevator.

A brake disc includes at least one friction surface consisting of a base body. The base body can be made from gray cast iron. At least one coating is applied on at least parts of the friction surface. The coating contains at least tungsten chromium carbide 2C and nickel-chromium NiCr. The coating may further contain tungsten carbide WC. The production of the brake disc according to the disclosure is also described herein. The coating has excellent oxidation resistance and good wear resistance even at high temperatures of up to 800° C.

The utility model relates to the technical field of casting models, and discloses a split bottom pouring type model for casting ductile iron and gray iron, which comprises a working table, an open slot is formed in the top of the working table, and a first two-way screw rod is rotatably connected to the right side of the working table; and the left end of the first two-way lead screw penetrates through the open groove and is rotationally connected with the left side of the interior of the open groove, a first driving bevel gear is fixedly connected to the outer side of the first two-way lead screw, and a fixing frame is fixedly connected to the top of the workbench. According to the utility model, by rotating the first bidirectional screw rod, the first driving bevel gear can be driven to rotate, the first driven bevel gear can rotate along with the first driving bevel gear, and the second driving bevel gear can rotate along with the second driving bevel gear, so that the second driven bevel gear can be driven to rotate; at the moment, the first two-way lead screw and the second two-way lead screw can rotate at the same time so that the clamping plates can move towards the two sides, and upper and lower dies of different sizes can be detached and replaced easily.

The invention discloses a manufacturing method of a metal / nonmetal all-material composite high-end numerical control machine tool. Relates to marble, a carbon fiber composite material, gray iron and other materials, and adopts lattice and other hollow lightweight structures. The lathe bed is made of marble materials and is good in shock absorption performance, good in heat stability, small in internal stress, not prone to deformation and high in precision. Structural members such as a stand column, a cross beam and a spindle box are fused with a three-dimensional weaving technology, fused deposition modeling and an automatic laying technology and are made of carbon fiber composite materials, and stress caused by movement is reduced while rigidity is guaranteed. Structural members such as the workbench are cast by adopting HT300 or HT600 through a multi-material composite sand mold additive and subtractive manufacturing technology, the strength is high, the abrasion resistance is good, the stress is low, and the precision and the bearing capacity are high. The application of the carbon fiber composite material can reduce the weight of the machine tool structural member, improve the performance and reduce the manufacturing and test cost. The manufacturing method has the characteristics of low stress, high reliability, high precision and long service life.

The invention discloses a preparation method of a high-carbon-equivalent, high-strength and low-stress machine tool gray cast iron piece, and belongs to the technical field of gray cast iron casting. According to the method, the specific inoculant is adopted, the gray cast iron molten iron is subjected to inoculation treatment for at least two times, scrap steel, pig iron and recirculated iron are used as main materials, the carbon equivalent is increased to 3.9% or above and is close to the eutectic point 4.23%, meanwhile, a small amount of alloy is used as an auxiliary material, the number of A-type graphite of the prepared gray cast iron reaches 95% or above, the pearlite content reaches 95% or above, and the structure uniformity is good. According to the method, the gray iron casting can obtain excellent A-type graphite and the quantity of the A-type graphite while the cost is not increased; and meanwhile, the gray iron casting has the properties of high and uniform hardness, high tensile strength, low stress and the like, the tensile strength value of the gray iron casting is larger than or equal to 250 Mpa, and the stress value is smaller than or equal to 50 Mpa.