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 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 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.