12 results about "Gray iron" patented technology

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 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.

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.

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.

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 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.

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.