259results about How to "Reduce the amount of machining" patented technology

The invention provides a rotary forging method for large disc type work pieces and a forging device. The method comprises preparing a forging die, preparing blanks, pre-forging a shunt slot, positioning the blanks and carrying out rotary forging in steps. Based on the method, the invention also provides a forging device which can realize relative rotation of an upper forging die and a lower die, and the local forming process for the disc type work pieces can be carried out through rotary forging of the upper forging die and the lower die. In order to control metal flow in the forging process, the procedure of pre-forging the shunt slot is added prior to the rotary forging. Moreover, the upper forging die with a special structure is adopted to overcome the warpage of the work pieces during rotary forging. The forming method has the advantages of low forming load, simple dies and low processing cost, and can greatly reduce the manufacturing cost of existing large disc type work pieces.

A sand shell mold for manufacturing the blank of a vehicle braking disc belongs to the field of manufacturing of car accessories, and comprises an upper mold and a lower mold; the junction surface between the upper mold and the lower mold is a poured parting surface of the braking disc; the upper mold comprises an upper mold plate and an upper cavity; the lower mold comprises a lower mold plate and a lower cavity; the lower mold plate is positioned at the periphery of the lower cavity; the lower cavity is formed inside the lower mold plate; the lower cavity is the same as a part below the parting surface of the braking disc in shape; and the size of the lower cavity is equal to the size of the part below the parting surface of the braking disc and the thickness of a sand shell. The sand shell mold has the characteristics that the production of the blank of the braking disc can be realized efficiently, materials and labors are saved, the mechanical processing capacity is reduced, casting flaws are reduced, the yield is improved, and the automatic production is easy to realize.

A cement grouting reinforcement connector comprises connecting reinforcements, a connecting sleeve and cement mortar; and the abutted ends of the two connecting reinforcements are combined into a connection body by the connecting sleeve and hardened cement mortar full of the gap of the connecting sleeve. The outer surface of the connecting sleeve and the inner wall of the sleeve are respectively provided with continuous or discontinuous grooves or bosses. The connector has the following advantages that a seamless steel pipe, a forged steel cylinder or a stamped steel cylinder which has high strength and stable property is used as the connecting sleeve, and the grooves in the outer surface of the connecting sleeve and the bosses on the wall of the inner holes are formed by using a rolling-pressing or rotary-pressing method. The raw material dosage is greatly reduced by the improvements of the structure and the material of the sleeve; and the cutting processing amount is greatly reduced by the improvement of the machining technique of the sleeve, and therefore, the cost of the sleeve is reduced and the production efficiency is increased; and the economic and technical indexes of the connector exceed those of the known cement grouting reinforcement connectors.

The invention provides a powder metallurgy injection molding process, belonging to the technical field of powder metallurgy. The powder metallurgy injection molding process comprises the following steps of: 1), mixing metal powder and a bonding agent according to a ratio; 2), feeding: putting a mixture of the metal powder and the bonding agent into a pre-designed and manufactured mould cavity; heating to 120-140 DEG C under the protection of ammonia gas to carry out warm pressing molding; and in a molding process, vibrating the mould cavity; 3), degreasing: after de-molding, heating a molded product to 250-300 DEG C; and 4), sintering: sintering at a vacuum state, wherein the sintering temperature is 850-1000 DEG C and the heat-preservation time is 1-2.5 hours. The invention provides a pulse periodic vibration mixing method aiming to solve the technical problems of defects of the prior art that the agitation is not uniform and the product stability is poor; and the disadvantages of poor mobility and mixing performance of raw materials in an injection molding process are overcome, the product density is high and the distribution is uniform.

The invention belongs to a cooling casting blank or casting mould device and relates to a water cooling channel for a large beam blank continuous casting crystallizer,,and particularly to a copper plate cooling device for a beam blank continuous casting crystallizer. The copper plate cooling channel is characterized in that: a web water gap, a R angle water gap, a bevel water gap, a flange inner angle water hole and a flange top water hole are formed on a broadside copper plate according to the characteristics of the copper plate shape and heat face heat flux; the water gaps without corners are distributed uniformly, and the water gaps at R angle are dense, and few water holes are arranged at concave corners; and a cooling water tank is arranged outside a narrow side copper plate. The copper plate cooling channel has the advantages that cooling water channels are arranged in areas, the number of cooling water channels is reduced, water gap diameter is reduced, and processing quantity is reduced; the water gaps are arranged reasonably, temperature peak value at the R angle is eliminated, the temperature gradient is reduced, the cooling strength of the flange top is weakened, the overall temperature of the copper plate tends to be uniform, the working environment of the copper plate and blank heat transmission condition are improved, the cooling effect is good, and water is saved; deformation and abrasion of the copper plate are reduced, and service life is prolonged; the surface quality of blanks is remarkably improved, the cogging yield is improved, and continuous casting production can be performed smoothly.

The invention discloses a blank-making rolling method for a synchronous sliding sleeve of an automotive transmission using circular steel as a blank material. The method comprises the steps of cutting, heating, upsetting, punching a blind hole and pre-forming, punching a wad and pressing an end face, performing ring rolling forming, shaping, normalizing, performing impeller blasting and the like, wherein the key point is that a rolling wheel used in the step of the ring rolling forming is provided with an annular groove corresponding to a blank of the synchronous sliding sleeve of the automotive transmission. By applying ring rolling process to the blank of the synchronous sliding sleeve of the transmission, the subsequent machining amount is reduced to the greatest extent, the material consumption is reduced and the service life of the finished product is prolonged.

The invention relates to a truck and motor coach magnesium hub rotary-swaging forming method. The method utilizes certain temperature and pressure and adopts rotary-swaging forming to enable magnesium alloy to be formed according to a predetermined die shape. The method comprises the technological steps of blank preparation, blank preheating, extrusion (pre-machining), blank pre-heating, rotary-swaging forming, heat treatment, machining, paint spraying and forming. Magnesium alloy automobile hubs produced by means of the method is high in finished product rate and stable in mechanical property, follow-up machining can be decreased, and machining amount and energy consumption can be reduced. By means of the method, large-sized hubs can be produced, and hub weight can be decreased.

The invention discloses a strip-shaped jacketed oil-heat roller, which comprises an inner pipe, an input shaft, an end cover, a partition plate, an inner cylinder, an outer cylinder, a strip, an inner ring plate, a ventilating pipe, a supporting shaft and a connecting pipe, wherein the input shaft is a hollow shaft, the jointing end of the input shaft and the connecting pipe is provided with a left radial hole and a right radial hole, and the inner pipe is inserted into the inner hole of the input shaft and connected with a step by crossing the left radial hole to form a bidirectional independent channel. The jointing end of the supporting shaft and the connecting pipe is provided with an axial blind hole channel which is communicated with the radial holes. The inner cylinder is connectedwith the input shaft and the supporting shaft through the inner ring plate, the baffle plate and the end cover; and a strip-shaped groove consisting of the strip is arranged in a jacket between the inner cylinder and the outer cylinder, and is communicated with an oil inlet cavity, an oil return cavity and the bidirectional independent channel through oil inlets at two ends of the wall of the inner cylinder and an oil return hole at one end of the wall of the inner cylinder. The strip-shaped jacketed oil-heat roller ensures that the error of a temperature on the surface of the roller is less than 5 DEG C through bidirectional equivalent heat exchange, thereby improving product quality. The invention is suitable for being matched with various specifications of rollers.

The invention relates to the technical field of application of amorphous alloy, in particular to a mobile phone shell and an amorphous alloy reinforcement block thereof and a manufacturing method of the amorphous alloy reinforcement block. The reinforcement block is the amorphous alloy reinforcement block made of zirconium-based amorphous alloy, copper-based amorphous alloy, titanium-based amorphous alloy, nickel-based amorphous alloy, palladium-based amorphous alloy or iron-based amorphous alloy. The reinforcement block is 400-600 in hardness, 1000-3000MPa in strength and 2-3% in elastic limit, and is non-corrosive on the surface after 500-2000h salt spray test. Amorphous-alloyed alloy ingot is adopted in the method to manufacture the amorphous alloy reinforcement block through a die casting molding method, a melt spinning method, a suction casting method, a rapid discharge molding method, a continuous casting method or a thermoplastic molding method. The amorphous alloy reinforcement block manufactured by the method has the advantages of high strength, high hardness, high elasticity and anti-corrosion, and the situation that a mobile phone is bent when the mobile phone shell is highly stressed can be avoided.

The invention discloses a small abnormal-shape combined forging and ring-rolling process which comprises the following process steps of inspecting a blank, cutting and grinding a rounded corner, upsetting and punching, conducting reversed ring-rolling, conducting ring-rolling on an abnormal shape, reeling, cutting in a back-to-back manner, inspecting the process, treating thermally, inspecting hardness, testing performances, machining, and finally inspecting, marking and packaging. The small abnormal-shape combined forging and ring-rolling process has the beneficial effects that the small abnormal-shape combined forging and ring-rolling process is provided, the quantity of machining is small, the stock utilization is high, the production efficiency is high, the streamline of a material can be prevented from being damaged, the product percent of pass is high, and the process can also be used to manufacture a small abnormal-shaped forged ring.

The invention discloses a combined powder metallurgy hollow camshaft cam material and a preparation method, belonging to the technical field of camshafts for internal combustion engines like automobile engines. The alloy components of the camshaft material comprise 1.5-3% of C, 3-7% of Cr, 0.5-1.5% of Mo, 0.3-0.6% of P, 1-3% of Cu, 0.05-1.5% of Si, 0.05-1.5% of Mn, 0.01-1.5% of Ti, and the balance of Fe. The powder is pressed into a cam sheet, the mandrel adopts a seamless steel tube, the cam sheet and the seamless steel tube are in clearance fit, and the cam sheet and the steel tube are assembled and then are sintered. The green body of the cam is directly assembled with the steel tube and then is sintered. In sintering, the powdery material shrinks and is densified and also forms metallurgical bonding with the steel tube, so that the bonding strength is high, the performance is reliable, the prepared cam has advantages of high torque, small stress, light weight and good abrasion resistance.

The surface hardening treatment process for piston rod of great power low speed diesel engine includes continuous surface heating to 900-940 deg.c in an intermediate frequency inducing heater of the quenching apparatus, quenching through spraying water, tempering through heating to 200-270 deg.c, and rotating the piston rod while heating in the inducing heater and spraying water. The present invention has high quenching efficiency, environment friendship, homogeneous heating and quenching, and capacity of reaching required surface hardness, quench hardened layer depth and micro structure.

The invention discloses a rotary module of a wheelchair. The rotary module is used for making a seat of the wheelchair to rotate relative to a wheelchair body of the wheelchair. The rotary module comprises a rotating shaft, a rotating body, a gear, a base and a gear driving unit, the upper end of the rotating shaft is fixed to the bottom of the seat, the rotating body and the gear are arranged onthe rotating shaft, the base is arranged on the wheelchair body, and a supporting sleeve is arranged on the base; the seat is connected with the supporting sleeve in an inserted mode through the rotating shaft, the rotating body on the rotating shaft is assembled on the supporting sleeve, and the gear on the rotating shaft meshes with the gear driving unit and is rotationally connected with the wheelchair body. The seat on the wheelchair can be combined with and separated from the wheelchair body in an inserted connection mode, so that transportation and carrying of the wheelchair are facilitated. Mechanical connection and electric connection of the wheelchair and the wheelchair body are achieved through inserted connection of the wheelchair and the wheelchair body in a one-time mode; mechanical connection is rotational connection so that the driving mode of the wheelchair can be changed through rotation of the seat to adapt to different passing conditions, and the operability of the wheelchair is greatly improved; meanwhile, the overall size of the wheelchair is greatly reduced by the adoption of the base of the sectional material structure, the structure is compact, and the machining amount of wheelchair production is greatly reduced.

Provided is an engine turbine disc optimizing manufacturing process and device based on heat-resisting alloy in the technical field of engine part manufacturing technologies. GH4145 workblanks are preheated and then are subjected to primary extrusion, secondary extrusion is performed by independently reducing the temperatures of a male die and a female die, accordingly knots formed on the surfaces of the workblanks are eliminated, and a turbine disc forge piece is manufactured. The dies are made of cheap nickel base alloy and are of closed structures free of flash gutters, the die forging force is reduced, and precious metal is saved. Compared with the prior art by which work can performed under vacuum or inert gas shielding condition, the engine turbine disc optimizing manufacturing process and device can manufacture a high-quality turbine disc with double hubs in the air in a constant-temperature die forging mode ad has the batch production condition while improving the metal utilization rate and reducing mechanical machining allowance.