36results about How to "Reduce extrusion load" patented technology

A control device for a vehicular opening / closing body is provided with a duty ratio calculator (78), which calculates a duty ratio when power supplied to a door drive motor (48) allowing an opening / closing body to open / close is subjected to duty control based on a result of adding first second multiplication values, the first multiplication value being obtained by multiplying a speed difference between a target opening / closing body speed and an actual opening / closing body speed by a negative proportional gain, and the second multiplication value being obtained by multiplying an integral value of the speed difference by an integral gain.

The invention discloses a forging method of a high-speed train axle box body. The forging method comprises the following steps that 1, blank blanking is conducted, wherein a blank is a cylindrical extrusion bar, and the blank with the set length is obtained through sawing blanking; 2, transverse flattening upsetting is conducted, wherein transverse flattening upsetting is conducted on the blank to obtain a prefabricated blank; 3 the prefabricated blank is extruded to obtain a pre-forging piece, wherein the pre-forging piece sequentially comprises an end corresponding to the shape of the axle box body, a middle and a rod portion in the length direction, and volume distribution of the pre-forging piece is matched with that of the axle box body; 4, final forging piece molding is conducted, wherein the pre-forging piece is placed in a final forging mold to be subjected to final forging, and a final forging piece is obtained. Volume distribution of the pre-forging piece is well matched with that of the final forging piece, an extrusion process is adopted in pre-forging piece molding, no flash is generated, the pre-forging piece is stably positioned in a final forging mold cavity, and therefore it can be guaranteed that the final forging piece is well molded.

An ethylene-α-olefin copolymer comprising monomer units derived from ethylene and monomer units derived from an α-olefin having 3 to 20 carbon atoms, having a density (d) of 860 to 950 kg / m3, having a melt flow rate (MFR) of 0.01 to 100 g / 10 min, having a bimodal molecular weight distribution, and having a single melting peak measured by a differential scanning calorimeter (DSC).

An object of the present invention is, in a thermoplastic elastomer composition in which a modified rubber is dispersed and filled in an ethylene-vinyl alcohol copolymer matrix in order to improve the low-temperature durability of the ethylene-vinyl alcohol copolymer, to reduce the extrusion load during extrusion molding thereof into a film without deteriorating the low-temperature durability. The present invention is a thermoplastic elastomer composition comprising an ethylene-vinyl alcohol copolymer (A) and a modified rubber (B) dispersed in the ethylene-vinyl alcohol copolymer (A), wherein the modified rubber (B) has an acid anhydride group or epoxy group and is dynamically cross-linked by a compound (C) having at least two amino groups. This thermoplastic elastomer composition can be suitably used in the production of an inner liner of a pneumatic tire.

The invention discloses an internal rolling extrusion forming device and a forming method for a metal cylindrical part, and relates to the technical field of metal extrusion forming. The device includes: a main gear box for driving a workpiece to be formed to rotate; It includes a second housing, an outer die holder and an outer rolling die, the outer die holder is set on the second housing, the outer rolling die is rotatably arranged on the outer die holder, and the outer rolling die is set on the outside of the workpiece to be formed The inner rolling die assembly includes a fixed seat, a mandrel and an inner rolling die, one end of the mandrel is rotatably arranged on the fixed seat, the inner rolling die is arranged on the other end of the mandrel, and the inner rolling die is nested in the Inside the forming workpiece; the guide rail, the first shell, the second shell and the fixing seat are arranged in sequence along the length direction of the guide rail, and one end of the guide rail is fixedly connected with the fixing seat, and the second shell and the first shell can be slidably set on the rail. The device can meet the requirement of isotropy in the microstructure and mechanical properties of the metal cylinder.

The invention relates to a metal alternative extrusion forming device and method and relates to a labor-saving extrusion forming device and method. The device and method solve the problems that according to an existing extrusion forming device and method, needed energy consumption is large, flowing uniformity is poor, and the material utilizing rate is low. According to the scheme of the device, an extrusion container is arranged on a base, a core die is arranged at the bottom of the extrusion container, blanks are arranged in the extrusion container and located above the core die, and one end of a first punch and one end of a second punch are arranged in the extrusion container and abut against the upper end faces of the blanks. According to the scheme of the method, the core die, the blanks, the first punch and the second punch are sequentially placed in the extrusion container; the second punch is fixed, the first punch moves downwards by the distance of L, and metal on the lower side of the first punch is extruded and deformed and is sequentially extruded and formed; then the first punch is fixed, the second punch moves downwards by the distance of 2L, and the blanks below the second punch are made to be extruded and formed. According to the acting sequence, the first punch and the second punch alternatively move downwards for loading till the blanks are totally extruded. The device and method are used for metal forming.

The invention discloses a three-dimensional variable-curvature sectional material online bending and forming device pulled by a robot initiatively. The three-dimensional variable-curvature sectional material online bending and forming device comprises a horizontal extruding machine, a quenching device, a guiding device, the initiatively-pulling robot, a cutting robot and a transfer robot; the quenching device is arranged on the outlet side of the horizontal extruding machine and is used for controlling the temperatures of all cross sections of an extruded sectional material; the guiding device is arranged in the quenching device and is used for straightening and positioning on the extruded sectional material; the initiatively-pulling robot is arranged on the discharging side of the quenching device and is used for pulling the extruded sectional material to achieve the three-dimensional variable curvature; the cutting robot is used for cutting the variable-curvature sectional material output by the initiatively-pulling robot; and the transfer robot is used for sending the cut variable-curvature sectional material output by the cutting robot into an extruding and conveying roller bed. By means of the three-dimensional variable-curvature sectional material online bending and forming device, the defects that by means of an existing extruding and bending integrated method, the required extruding load is high, the stress of the cross sections of the sectional material is uneven, and surface scratches are generated are overcome, bending and forming quality of a product is improved, and the material utilization rate is increased.

The invention provides a streamlined self-bending extrusion die and a design method thereof, relating to the technical field of dies, comprising the following steps: designing the boundary control curve on one side of the die cavity section based on a sine function; designing the boundary control on both sides of the die cavity cross section The curve is asymmetrical; based on the boundary control curves on both sides, a smooth transition is made to obtain the surface control function of the cavity; a working belt structure is added behind the cavity of the extrusion die, and the wall surface of the working belt structure is parallel to the extrusion direction; The streamlined cavity of the compression mold can make the material flow unevenly during the extrusion process and then obtain the self-bending extrusion profile. The flow of the streamlined cavity is closer to the real material flow path, and the streamlined adaptable mold can reduce the extrusion load, The local damage of the mold is reduced; the technical problems of springback, wrinkling and section deformation during the bending process of the profile in the prior art are alleviated, and the technical problems of reducing the load during extrusion are alleviated.

The invention discloses a method for preparing titanium alloy nano materials through warm extrusion of a herringbone channel mold. The method is characterized in that through the herringbone central axis, the herringbone channel mold is rotated by 120 degrees, and then subsequent-pass extrusion is carried out; repeated plastic deformation of the titanium alloy nano materials can be achieved, and finally, large deformation is accumulated; the nano titanium alloy materials are obtained; in each pass extrusion process, the rotating direction of the herringbone mold is changed, and uniform severe plastic deformation of the titanium alloy can be achieved; and the grain size is uniform, and refined nano grains are equiaxed grains with large grain boundary angles, and the mechanical property of the blocky nano titanium alloy is further improved, and on the premise that the high density is ensured, the high strength and the good toughness are high.

The invention relates to a sectional material self-bending forming extrusion die, and relates to the technical field of dies. The sectional material self-bending forming extrusion die is used for solving the technical problem that the cross section deformation is easily caused when the outer side surface of a sectional material is subjected to large stress in the prior art. The sectional materialself-bending forming extrusion die comprises an upper die and a lower die connected to the upper die; and due to the fact that the area covered by an inner contour line of the upper half part of a flow guide cavity is larger than the area covered by the inner contour line of the lower half part of the flow guide cavity, and the area covered by an inner contour line of the upper half part of an extrusion cavity is larger than the area covered by the inner contour line of the lower half part of the extrusion cavity, the metal amounts flowing into the upper sides of the flow guide cavity and theextrusion cavity is more than those flowing into the lower sides correspondingly, so that a blank is pre-deformed firstly during extrusion, the extrusion load on the outer side surface of the sectional material can be reduced, and extrusion molding is facilitated.

The invention relates to a method for realizing synthermal extrusion of an aluminium alloy material, which aims at obtaining a high-property extruded aluminium alloy product with a uniform structure property along the length direction. The method provided by the invention comprises the following steps: selecting an extruding device and computing the size of an extrusion billet according to a type and a specification of a target product; determining a maximum allowable temperature T1 and a heating temperature T0 of the billet of the extruded aluminium alloy product according to the production experience and the information data, so as to determine an allowable extrusion temperature rise deltaT; and determining an extrusion speed Vj and a heating temperature Tc of an extruding cylinder according to the extrusion flowing deformation characteristics and the balanced heat flow and temperature characteristics of metal. According to the invention, the technical parameters are utilized, so that the synthermal extrusion production can be realized under the uniform heating temperature of the billet and the constant extrusion speed, without reforming the existing extrusion production equipment or increasing any auxiliary equipment; uniform-speed and constant-pressure extrusion can be realized under the constant-temperature (synthermal extrusion) condition; and extrusion load can be reduced and energy consumption of the production can be reduced through reasonably matching the extrusion speed and the heating temperature of the billet.

An extruding and rolling composite forming device and an extruding and rolling composite forming method of an integral panel skin with ribs belong to processing forming devices and processing forming methods of the integral panel skin with the ribs, and aim at solving the problems that the manufacturing cycle is long, the material utilization rate is low and the forming accuracy is hard to guarantee when an existing integral panel skin with ribs utilizes roll forming and bending forming and the problems that special equipment is needed and the cost is high when peen forming and creep age forming are utilized. The extruding and rolling composite forming device of the integral panel skin with the ribs includes a punch, an extruding container, two cylindrical rollers and two driving mechanisms, wherein two sides of the lower end of a chamber is provided with the two cylindrical rollers, the axes of the two cylindrical rollers are on the same plane, the horizontal distance of the centers of the section circles of the two cylindrical rollers to the vertical center line of the chamber is the same, the side surface on the outer periphery of at least one of the two cylindrical rollers is provided with a plurality of grooves, and each of the cylindrical rollers is connected with one driving mechanism capable of driving the roller to rotate. The extruding and rolling composite forming device and the extruding and rolling composite forming method of the integral panel skin with ribs are applicable to the forming of the integral panel skin with ribs.

The invention discloses a rotating pipe shaping and pulling device and method, and relates to the field of pipe production equipment. The device comprises a pulling sleeve arranged on a rotating pipein a sleeving manner; the two ends of the pulling sleeve are sleeved with hooping devices; a key groove is formed in the outer wall of the pulling sleeve; the key groove is fixedly connected with a rotating wheel through a key; the rotating wheel meshes with a driving wheel; one end of the driving wheel is connected with a motor through a driving shaft; the rotating wheel and the driving wheel arearranged on a transmission box body through bearings; the pulling sleeve penetrates through the rotating wheel and the transmission box body; friction blocks are evenly arranged on the inner wall ofthe pulling sleeve; and the friction blocks make contact with the outer wall of the rotating pipe. With the adoption of the shaping and pulling method of the rotating pipe shaping and pulling device,spiral pulling of the pipe in the axial direction is realized, and the pulling efficiency is improved.

The invention discloses a small diameter thin wall deep blind hole part extrusion mold which combines extrusion and stretching working procedures into one mold and is applied to molding of small diameter thin wall blind hole parts with large deformation quantity, extrusion ratio and long diameter ratio. The small diameter thin wall deep blind hole part extrusion mold structurally comprises an upper mold plate, a lower mold plate, a lower mold core, guiding position-limiting components, a mold cavity with a heating function and a punch head, wherein a pull mold angle arranged inside the mold cavity makes materials be capable of flowing out of a deformation area in the reverse extrusion process to reduce the contact area with the mold, so that load of the mold in the reverse extrusion process is reduced, the key problem that the small-diameter punch head has short life in the extrusion process is solved, the mold cavity acts as a pull mold to be used in the ascending process, and the stretching materials are normalized to the standard size. According to the small diameter thin wall deep blind hole part extrusion mold, by means of the manner that a reverse extrusion mold and a stretching mold are combined into one mold, the molding efficiency of small diameter thin wall deep blind holes can be effectively improved, and the material use ratio is high; and meanwhile, produced products have low residual stress, the fabrication cost is low, the mold is convenient to maintain and operate, and the small diameter thin wall deep blind hole part extrusion mold has wide application value.