3321results about "Extrusion dies" patented technology

A method and apparatus for manufacturing a honeycomb compact-body molding die having material feed bores for supplying material therethrough and slit recesses formed in a polygonal lattice pattern to mold the material in a compact body with a honeycomb shape are disclosed. The slit recesses are formed on a recess forming surface of the molding die using an electrode having electrode segments, formed in a lattice pattern corresponding to shapes of the slit recesses each of which has a wall thickness of 0.1 mm or less, to generate an electrical discharge between the molding die and the electrode to form the slit recess on the molding die. When the electrode is worn by a given amount, an apical end cut-off processing step is executed to cut off an apical end of the electrode using a dress plate to expose a new apical end formed with an electrical discharge surface.

The invention relates to a method for shaping the vehicle hub and relative device. Wherein, it comprises following steps that casting blank; uniform processing; pre-shaping blank; compressing; compressing the front rim; expanding opening and folding the edge at the back rim. The invention is characterized in that: the casting blank via pre-shaping is made into hollow blank; the concave and convex moulds in the compressing step and the compressing front rim step are integrated, while the convex mound contains core axle; the compressing step compresses the hollow blank in the mould via core axle to obtain the cylinder element whose bottom has holes; the step that compressing front rim uses metal diversion to stuff and shape; the step that expanding opening and folding the edge of back rim uses integrated convex mould and separated concave mould to expand opening, fold edge an shape the back rim. The invention can simplify the process, reduce device number, reduce the shaping force, reduce the energy consumption, and reduce the producing cost. The invention is mainly used to produce aluminum and magnesium alloy hub.

The invention relates to a press forming method of magnesium alloy automobile wheels and a die thereof, the working procedures of the press forming method comprise: blanking-continuous upsetting-backward extrusion-machinery adding-forward extrusion-flaring-thermal treatment-ultimate machinery adding-superficial treatment; the press forming die comprises: a backward extrusion die, a forward extrusion die and a flaring die; the method of the invention can directly form magnesium alloy or aluminium alloy automobile wheels of various shapes, which solves the problem of hard forming of flanges of wheels and reduces the forming force, which particularly suitable for the magnesium alloy of low plasticity with hexagonal close packed lattice, three-direction compressive stress acquired from forward extrusion is beneficial to improve the plasticity of the material; the formed wheel has the advantages of high size precision and surface precision, good comprehensive mechanical property and simple die structure, which improves the quality of the product, simplifies technical process, decreases die frock and equipment and reduces production cost.

Embodiments of the present invention include composite articles comprising at least a first region and a second region and methods of making such articles. The first region may comprise a first composite material, wherein the first region comprises less than 5 wt. % cubic carbides by weight, and the second region may comprise a second composite material, wherein the second composite material differs from the first composite material in at least one characteristic. The composite article may additionally comprise at least one coolant channel. In certain embodiments, the first and second composite material may individually comprise hard particles in a binder, wherein the hard particles independently comprise at least one of a carbide, a nitride, a boride, a silicide, an oxide, and solid solutions thereof and the binder comprises at least one metal selected from cobalt, nickel, iron and alloys thereof. In specific embodiments, the first composite material and the second composite material may individually comprise metal carbides in a binder, such as a cemented carbide.

The invention belongs to extrusion forming technologies for non-ferrous metal materials and relates to a precise extrusion forming process of a thin-wall long pipe-shaped part blank with a flange. The forming process comprises two steps of primary backward extrusion and secondary forward extrusion, wherein in the step of primary backward extrusion, a primary backward extrusion convex mould (6) is utilized to match with a primary backward extrusion concave mould to together with a piece pusher (11) as an auxiliary for obtaining a primary backward extrusion pipe blank (17) with a web; a secondary forward extrusion convex mould consisting of a forward extrusion convex mould (14) and a mandrel (13) and a secondary forward extrusion concave mould (15) are utilized to carry out the secondary forward extrusion; and the secondary forward extrusion convex mould is placed into a primary backward extrusion pipe blank (18) and moves downwards to extrude the primary backward extrusion pipe blank (18) to obtain a secondary forward extrusion pipe blank (19) so as to finish a secondary forward extrusion process. The internal quality, the size precision and the material utilization rate of the produced thin-wall long pipe-shaped part blank with the flange are greatly improved; and meanwhile, the production efficiency is improved, and the production cost is reduced.

A method of processing a billet of metallic material in a continuous manner to produce severe plastic deformation. The billet is moved through a series of CSPD dies in one operation to efficiently produce a billet characterized by a controlled grain structure. The long billets of metal stock are moved along the processing path through the CSPD dies with plural sets of pinch rolls which grip the billet and push it into the entry channel of the dies. Other sets of pinch rolls pull the billet from the exit channel of the dies.

The invention relates to a rare-earth magnesium alloy seamless thin wall tubule hot-extrusion method and its specialized mold. The method includes: machine-tooling after casting ingot homogenization treatment into a hollow blank, performing pre-extrusion in the mold, extrusion molding after die change, and performing solid dissolving aging treatment for further improving the tube dynamics performance. The invention relates to a special mold, including an upper and a lower die holders, a thermal insulation sleeve, a squeezing barrel, a male die and a concave die, wherein, the concave die is composed of a pre-extrusion concave die and a shaping concave die, one of the pre-extrusion concave die and the shaping concave die is selected and interchangeable with the other, and is fixed on the lower die holder through a squeezing barrel. The invention can extrude a rare-earth magnesium alloy seamless thin wall tubule with the external diameter of 5-10mm and internal diameter of 4-8mm, which has features of high material utilization, small extruding force, high products dimensional precision, good surface accuracy, good dynamics performance and the like features. The inventive mold simultaneously has advantages of simple structure, easy operation, low cost, long life and so on.

A reciprocated extrusion die for preparing the L-shaped channels of superfine materials belongs to the machine processing field. The invention comprises an upper part and a lower part; the lower part comprises a lower bottom plate, a slide plate, a cavity die and a cavity die cushion block; the upper part comprises a guide plate, a convex die, a convex die fixing plate, a convex die cushion block, an upper bottom plate, a spring and a discharge bolt; wherein, the cavity die is composed by connecting an inner ring and an outer ring; the squeezing die cavity of L-shaped channels is arranged in the cavity die; the outer ring is connected with the bottom plate; the cavity die cushion block is arranged between the inner ring and the lower bottom plate; the slide plate is arranged on the cavity die cushion block; the upper end of the convex die passes through the central hole of the convex die fixing plate and is fixed; the lower end passes through the central hole of the guide plate; the convex die fixing plate is connected with the bottom plate; the convex die cushion block is arranged between the convex die and the upper bottom plate; and the guide plate is connected with the upper through a discharge bolt which passes through the spring in the hole of the convex die fixing plate. The extrusion die has the simple structure, the high grain refining capacity and the convenient operation and realizes continuous production.

The invention relates to a device and a method for preparing fine-grained material by directly extruding a continuous variable cross section, which relate to a device and a method for preparing fine-grained material. The invention solves the problems of the traditional fine-grained material preparation methods that the procedures are complicated, the process requirements are high, the texture orientation is significant, the defects of folds and material interface superposition are easy to occur in processing and preparation and the preparation methods are difficult to be implemented in production. A primary transition die cavity, a secondary transition die cavity and a core die cavity of the preparation device of the invention are combined to form an axial corrugated extrusion cavity of the continuous variable cross section; the preparation method of the invention comprises the following steps: the preparation device is assembled; an ingot is arranged in a female die, a punch head is put it, a punch head is put in, the die orifice on a core die extrusion end is closed, the punch head descends, the ingot is extruded form a primary transition die orifice and a secondary transition die orifice, the punch head continues to descend, and the ingot is upset and deforms; and the closure is removed, the punch head continues to descend, and the ingot is extruded and formed. The invention requires simple equipment and few production procedures, and is easy to be implemented and popularized in production.

The invention discloses an inner transverse bar extrusion die for a cylindrical component. The inner transverse bar extrusion die comprises an upper die base, a wedge, a left convex die, a right convex die, a left convex die fixing plate, a right convex die fixing plate, a hydraulic cylinder of a left push-pull fixing plate, a hydraulic cylinder of a right push-pull fixing plate, a concave die, a stopper, a lower die base, a thrust bearing plate, a steel ball bearing bracket, a steel ball, a spring and a rotating device, wherein the left and the right convex dies are mounted on the upper die base and can slide left and right, the opposite side walls of the left and the right convex dies are slopes, and the wedge is embedded between the slope of the left convex die and the slope of the right convex die; the concave die is fixed on the lower die base through the stopper, and the upward and downward floatation of the concave die is realized on the lower die base through the spring. According to the inner transverse bar extrusion die provided by the invention, the separable convex dies and the floating type concave die are adopted, a workblank is vertically pressed down by the convex dies and driven to rotate by the concave die, a cylindrical wall is formed in a way that the workblank spirally flows upwards in the twisting process, cylinder fibers are spirally distributed and diagonally arranged, isotropy is realized, and the lateral and longitudinal comprehensive performance of the extruded component is improved.

The invention relates to a method for preparing a magnesium alloy section through continuous angle rotation shearing, extrusion and shaping and a mould. The method comprises the following steps: (1) a magnesium alloy blank material is subjected to homogenization treatment; (2) a mould of an extrusion mould with a plurality of angle rotation and molding is preheated; and the inside of a mould passage is evenly coated with lube; (3) an extrusion cylinder is heated to a temperature of between 175 and 325 DEG C; and (4) the homogenized blank material is heated to a temperature of between 200 and 350 DEG C; the extrusion ratio of the extrusion mould is between 4 and 100; and the magnesium alloy blank material is subjected to unidirectional extrusion at an extrusion speed of between 3 and 6 m / min so that the magnesium alloy blank material is subjected to compression and extrusion with high extrusion ratio and equal passage extrusion with a plurality of angle rotation. The magnesium alloy material prepared through the method has an ultrafine crystal grain structure, has the advantages of substantially improving the plasticity, low temperature superplasticity and high strain speed of the magnesium alloy material and has high yield stress.

The invention relates to an equal-passage variable-cross-section extruding mold and an extrusion forming method for pipes. The equal-passage variable-cross-section extruding forming is adopted, so the extruding forming of the pipes is formed through the twisting shearing deformation and the upsetting deformation on the cross section, and the combination of various deformation modes in one extruding process is realized. The pipe walls are in a strong three-direction press stress state through being limited by die cavities and polyurethane foam filling agents, in the deformation stage of circle-ellipse-circle and ellipse twisting change, materials enter twisting shearing deformation zones of the metal transition regions, the material internal tissues generate rotation and shearing stress under the effect of the shearing stress, the orientation of the material tissue structure is caused, i.e. a new tissue structure is formed, and the material tissue structure under the same deformation degree is improved. The mold and the method have the advantages that deformation degree higher than that of the traditional forming process can be obtained, the strain distribution and the stress distribution inside the pipes are improved, residue casting tissues of the pipes can be favorably crushed, the forms and the distribution of inclusions are changed, and the internal tissue defects of the pipes are eliminated.

The invention discloses a circular channel and corner based extruding and moulding mold and a circular channel and corner based extruding and moulding method of a magnesium alloy cup-shaped component. The mold mainly adopting a combined die, and the combined die comprises a U-shaped lower die and a T-shaped upper die; the middle part of the T-shaped upper die is provided with a long l-shaped cavity; the T-shaped upper die is arranged on the U-shaped lower die; and the cross section of the cavity of a formed rotor is shaped like a Chinese character 'shan'. A blank is put in the l-shaped cavity in the middle of the T-shaped upper die, the upper end of the blank is extruded by a male die, the metal on the lower end of the blank is deformed by upsetting to flow radially, and while being further deformed by upsetting, the metal is backwards extruded and deformed to flow axially along the wall of a female die, so that the cylindrical wall of the cup-shaped component is formed. By adopting the circular channel and corner based extruding and moulding mold, the magnesium alloy can be greatly improved in forming capacity and significantly refined and compacted in structure, the performance anisotropy of the magnesium alloy cup-shaped component can be reduced, and the manufacturing process of the high-performance magnesium alloy cup-shaped component can be shortened.

The invention discloses a method and a die for the forward extrusion and variable diameter bending extrusion of magnesium alloy semi-solid billets. The preparation method comprises a predeformation process and an isothermal spheroidizing heat treatment process, wherein in the predeformation process, uniform deformation of large deformation amount is realized by the die for the forward extrusion and variable diameter bending extrusion; cutting a magnesium alloy bar stock which is subjected to large deformation by a fixed size; heating the magnesium alloy bar stock cut by the fixed size at the temperature of between 520 and 580 DEG C under the protection of argon, and keeping the temperature of the obtained magnesium alloy bar stock for 10 to 30 minutes; and processing a bending extrusion angle of the die to be over 90 degrees. The method has the advantages of small predeformation resistance, large and uniform deformation, safety, reliability and no three-waste pollution. The grains of the prepared magnesium alloy semi-solid billets have fine size, are uniform and have a shape close to that of a sphere. The method solves the problem that the conventional SIMA method cannot continuously prepare the large-size semi-solid billets and meets the requirements of the semi-solid thixoforming workpieces for large-scale continuous production.

A preparation method of a magnesium alloy variable-section cylindrical member by composite extrusion deformation is characterized in that the method comprises the following steps: firstly, orderly performing homogenization pretreatment and hot extrusion deformation of an AZ80 magnesium alloy blank; preparing a variable-section cylindrical force-bearing member by forward and backward composite extrusion; finally performing turning and heat treatment to obtain a magnesium alloy variable-section cylindrical member. Compared with the prior art, the invention has the following advantages that the invention can prepare large-size cylindrical members; the material grain is fine; the mechanical properties are high; and the procedures are simple.

The invention relates to a continuous extrusion machining device used for a magnesium alloy sheet strip with a weak basal texture and an extrusion machining method. The device comprises an extrusion system mainly composed of a pressure motor, an extrusion telescopic head, a male die and a female die, and multiple inclined steps gradually getting close to the axis of a die cavity are arranged at the two sides below the upper middle portion in the die cavity of the female die and are distributed asymmetrically. In the extrusion machining process, a magnesium alloy blank is placed in the die cavity of the female die and extruded by the descending male die, and as the male die descends continuously, the magnesium alloy blank is gradually thinned to form a magnesium alloy sheet with the weak basal texture. Due to step-by-step grain refinement and basal texture weakening, extrusion force in the extrusion process is greatly reduced, the average grain size of the magnesium alloy is greatly reduced compared with that of a magnesium alloy extruded normally, and the (0002) basal texture is reduced to 8.2 from 27.6 compared with that of a sheet obtained through normal extrusion.

The present invention relates to semi-solid forming technology, and is especially semi-solid multi-blank extruding process and apparatus for forming double-layer composite pipe. The technological process includes the following steps: pre-heating the mold to 200-300 deg.c and establishing temperature control system, setting the induction heated blank into the extruding mold, and extruding at regulated speed and stroke to obtain the required composite pipe. The new extruding process for making composite pipe has short procedure, low power consumption and high product quality.

The invention mainly discloses a multidirectional extrusion molding process and a multidirectional extrusion molding die for an aluminum alloy shell parts with branches. The die mainly comprises driving radial outer sleeves, two split female dies, and a vertical male die. The split female dies are vertically symmetrical to each other and are fixed on a stroke mechanism and can move horizontally; and a model cavity which has a part shape is formed in each split female die. The driving radial outer sleeves are sleeved outside the split female dies; and the inner die surfaces of the driving radial outer sleeves are in fit with the outer die surfaces of the split female dies. The invention also discloses the molding process implemented by using the die. The process comprises the following steps of: performing multidirectional extrusion on the aluminum alloy shell part blank with branches by using the multidirectional extrusion die, placing the blank in a die cavity of the die, and forming the aluminum alloy shell part with branches at one time under the continuous action. The invention effectively overcomes the problems of the conventional manufacturing processes, such as the extrusion molding process, a casting process, a welding process and the like, and the die has a simple structure and a high forming property.

The invention discloses a combined plastic forming method of an automobile hub and a matching forming mold of the automobile hub. The method comprises the following steps of: 1, forming the automobile hub by using light-alloy blanks through a set of forming mold at two steps under the condition of constant temperature, wherein the forming mold is provided with a split lower mold, two upper extrusion male molds and two upper bulging male molds, and the upper extrusion male molds and the upper bulging male molds are sequentially matched with the split lower mold; 2, matching the blanks in the mold by using the upper extrusion male molds and the upper bulging male molds during forming; 3, pre-forming a spoke part of the hub and the lower part of a rim by adopting an extrusion process; 4, forming the upper part of the rim into a hollow pipe blank; and 5, matching the upper bulging male molds with the lower mold and forming a pre-formed part formed in the step 1 into the hub through the extrusion process. Equipment disclosed by the invention has a simple structure, the deformation resistance of each-step process is lower, the mold size and the equipment tonnage are effectively reduced,the production efficiency is improved, and the production cost is lowered.

The invention provides a swelling pressure composite forming method for a large-section-difference special-shaped section pipe fitting and relates to a forming method for a large-section-difference special-shaped section pipe-shaped part. The swelling pressure composite forming method comprises the main steps that 1, the perimeters and the equivalent diameters of a plurality of cross sections on the to-be-formed large-section-difference special-shaped section pipe fitting are determined, and the structure of a swelling pressure composite forming mold and the inner cavity size and initial position of a side extrusion mold are determined; 2, an equal-diameter circular-section pipe blank with a certain length is cut and put into the swelling pressure composite forming mold; 3, the equal-diameter circular-section pipe blank is filled with a pressure medium with a certain pressure through a pressure medium inlet, and a variable-diameter circular-section pipe blank is obtained through swelling; 4, the side extrusion mold is driven to extrude the variable-diameter circular-section pipe blank, and the large-section-difference special-shaped section pipe fitting is obtained; and 5, the pressure is released, and after the swelling pressure composite forming mold is opened, the formed pipe fitting is taken out. The swelling pressure composite forming method is used for forming large-section-difference special-shaped section pipe fittings.

The invention discloses a two-step plastic forming method for a wheel hub of an automobile. The method adopts two sets of molds to perform extrusion forming on a blank in two steps under isothermal conditions, and comprises the following steps: 1, placing the blank into a extrusion forming mold, and forming a wheel spoke part firstly and pre-forming front and rear wheel rim parts of a wheel felloe at the same time by adopting an extrusion mode; and 2, placing a preformed part into a flaring mold to perform one-time flaring forming on the front and rear wheel rim parts of the wheel felloe. Compared with the prior art, the method has the characteristics of low forming force, less equipment investment, low production cost, high forming quality, and the like. At the same time, the invention also discloses the extrusion forming mold and the flaring mold which are matched with the method.

The invention relates to a composite forging inner / outer same set process of small-medium size British system conical bearing sleeved columns, belonging to the technical field of the forging of British system conical bearing rings, and mainly solving the problems that a traditional British system conical ring forging process cannot realize the simultaneous production of an inner ring and an outer ring and the charging cost in the heterogenic set forging production is increased. The composite forging inner / outer same set process is characterized by comprising the following steps of: (1) heating a GCr15 steel charge segment with the weight of 0.320-1.200kg and the diameter of phi35-phi50 on a medium frequency induction furnace to 1050 DEG C, and then placing the heated charge segment on a pressure machine for upsetting, combined extrusion for forming, and sleeve separating to separate the heated charge segment into an outer bearing sleeve blank and an inner bearing sleeve blank; (2) carrying out ring rolling on the outer sleeve blank on a broking machine, and directly cooling or cooling into an outer bearing sleeve forged piece after finishing diameter on the pressure machine; and (3) placing the inner sleeve blank on the pressure machine for upsetting, extruding, and perforating, cooling and then forming a same set British system conical bearing inner sleeve forge piece. The invention is mainly applied to the manufacture of the forged piece of the same type of medium and small size British system conical bearing inner / outer rings.

The invention discloses a manufacturing process of an aluminum alloy rim of a large vehicle, which relates to the manufacturing process of the rim. The manufacturing process of the aluminum alloy rim of the large vehicle comprises the steps of: A) blanking; B) prefabricating blank by swinging and grinding on a swing grinding machine; C) punching on a press; D) pre-forging by backward extrusion on the press through a backward extrusion mold; E) final forging on the press again; F) flaring and cutting edges; G) spinning on a spinning machine through a spinning wheel; H) performing thermal treatment; I) machining; and J) performing surface treatment. With adoption of a technique that combines swinging and grinding, backward extrusion and spinning, the manufacturing process not only improves the product quality, but also reduces the investment on the swing grinding device. The process has the advantages of being long in service life of mold, low in product cost, low in energy consumption during production process, and good in labor environment, and is suitable for mechanical automation and popularization.

A multifunctional vibration extrusion die based on electro-hydraulic servo driving comprises a lower female die and an upper male die. The multifunctional vibration extrusion die further comprises an upper hydraulic cylinder and at least three lower hydraulic cylinders. The upper hydraulic cylinder and the lower hydraulic cylinders are respectively connected with a high-pressure hydraulic valve. The upper hydraulic cylinder comprises an upper cylinder body and an upper piston. The upper cylinder body is provided above an inner hole of a male die bush. The upper piston is fixedly connected with the male die. The male die is equipped below the inner hole of the male die bush slidably in a vertical direction. The male die bush is fixedly connected with a vibration tray. The lower hydraulic cylinders are symmetrically equipped at the bottom of the vibration tray. Each lower hydraulic cylinder comprises a lower cylinder body and a lower piston. Each lower cylinder body is fixedly connected with a lower die base. Each lower piston is fixedly connected with the vibration tray. The multifunctional vibration extrusion die based on electro-hydraulic servo driving according to the invention effectively reduces a vibration process in a forming process and reduces requirement to the extrusion equipment.

The invention relates to a reciprocating extruding device and a machining method of a reinforced magnesium alloy tube, belongs to the field of plastic machining of nonferrous metals. The reciprocating extruding device comprises an upper extruding ring, a lower extruding ring, an upper fixed extruding rod, a lower fixed extruding rod, an extruding cylinder mold and a necking region, wherein the extruding cylinder mold is divided into an upper mold cavity and a lower mold cavity by the necking region, and a heating sleeve is arranged on the outer wall of the extruding cylinder mold; the upper extruding ring and the lower extruding ring are respectively arranged at the peripheries of the upper fixed extruding rod and the lower fixed extruding rod and are respectively arranged in the upper mold cavity and the lower mold cavity, the upper extruding ring and the upper fixed extruding rod are connected with an upper hydraulic stretching cavity, and the lower extruding ring and the lower fixed extruding rod are connected with a lower hydraulic stretching cavity. The reciprocating extruding device has the beneficial effects that the tensile strength of the magnesium alloy tube machined by virtue of the reciprocating extruding device can reach 500MPa, and an extruding mold is simple in structure and strong in operability of extrusion deformation and can realize continuous extrusion deformation, so that the production cost is relatively low, and the production efficiency is high.

The invention discloses a microplastic shaping method and device of microelement in the microplastic piece preparing and shaping technical domain, which comprises the following parts: laser heating system, microshaping system, loading system, control system and assembling platform, wherein the flat-top laser beam emitted by laser is loaded on the surface of microelement surface through transmittable terrace die, which utilizes laser to do non-contact heating of working piece and heat conductivity; the heat work piece material is below recrystallizing temperature for shaping temperature scale; the terrace die does feeding movement towards female die through microdriving system; the loading system combines the microdriving system to realize loading action for microblank to finish microplastic shaping. The invention reduces the deformation resistance of material at non-contact heating on the upper surface of working piece through laser, which increases the evenness of material fluidity for batching manufacturing of microelement to realize automation manufacturing easily.

The invention discloses a chipless forming method for a gear stick and a section gear through hot extrusion by utilizing an alloy steel horizontal type backward extruder, solving the problems that the existing gear cutting process has more working procedures, low efficiency, large metal loss, more operators for machine tool processing and high production cost and the like by utilizing the chip processes of lathing, milling, drilling, inserting and grinding. The method comprises the following steps: an inner cooling combined type double-conical surface gear squeezing die, a recipient and a floating pecker combined mandril are adopted by taking the producing principle of alloy steel thick wall special seamless steel tubes as an example; scale-free heating is rapidly carried out on the blank; lubricating warm-extrusion molding is carried out; center punching, shaft hole slotting and tooth surface extrusion are finished at a time; and the finished product of the gear stick is directly produced, then is subject to waste heat annealing, slicing by wire-electrode cutting and heating process to be manufactured into a finished product. Compared with a chip gear-cutting molding method, the invention has simplified working procedure, few labor, high efficiency, less metal loss, high gear strengthen and reduces the production cost, and then tooth surface precision reaches the standard. The method of the invention is a significant technological innovation of straight tooth and oblique tooth cylindrical gear process technologies.

A method of forming a composite article by injecting at least two composite materials comprising metal carbides into a mold to form a green compact is disclosed. The composite materials may be metal powders comprising a binder metal, a hard particle. The composite material may further comprise a plastic binder. The two different composite materials are injected into the mold to form the green compact. Additionally, the composite materials may be injected through a die before entering the mold. In a specific embodiment, the die forms at least one internal channel within the green compact.

The invention relates to an extrusion forming method for a wheel hub of an automobile, and an extrusion piece for the wheel hub is formed by adopting work division procedures isothermally. The method comprises the following steps: a biscuit which has the same outside dimension as the outside dimension of the wheel hub to be formed is taken, and is subjected to processing and forming through forward extrusion, combined extrusion and a flaring procedure in sequence, wherein the forward extrusion forms a wheel arm and enables the rest metal to be gathered evenly in the peripheral positions of the wheel arm preliminarily; the combined extrusion pre-forms a barrel-shaped wheel rim and the upper and the lower wheel flanges of the wheel rim; and the flaring process enables the wheel rim to be formed. The invention further relates to three sets of moulds, which include a forward extrusion and forming mould, a combined extrusion and forming mould and a wheel rim flaring mould. The technical proposal of the invention can reduce the forming force, save the investment of the equipment and the mould, lower the production cost, and improve the quality of forming products.