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

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).

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 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.

The invention relates to an extrusion device for shortening a blank friction flow path, which is suitable for continuous extrusion equipment. The extrusion device is characterized in that a blank friction flow path shortening device constituted by a wrap angle adjusting mechanism and an auxiliary blank gripping mechanism is arranged on a frame, and the wrap angle adjusting mechanism comprises a gripping wheel position adjusting component and an extrusion cavity position adjusting component; and the auxiliary blank gripping mechanism comprises a bending guide roller I, a bending guide roller oil cylinder I, a bending guide roller II and a bending guide roller oil cylinder II, so that the blank friction flow path can be shortened and the rotational angle of a blank can be reduced. According to the extrusion device disclosed by the invention, by adjusting the positions of a gripping wheel and an extrusion cavity, the blank flow path can be shortened, and the rotational angle of the blank can be reduced, so that the extrusion device can further reduce the extrusion load and deformation temperature of metal, not only save energy, but also prolong the service life of a tool and a mold; and particularly, the control of the deformation temperature can be realized by adjusting the blank flow path, which is very beneficial to preparation of high-performance nonferrous metal extruded products with fine-grained structures.

The invention provides a variable-channel corner self-bending extrusion die and a design, manufacturing and extrusion method thereof, and relates to the technical field of dies. The method comprises the following steps: 1, a symmetric streamlined extrusion die is designed based on a sine function; 2, a central axis of a die cavity of the symmetric streamlined extrusion die is distorted and deformed at a certain plane; 3, a cavity wall surface equation for the variable channel corner self-bending extrusion die is established; 4, a work strip structure is added behind the die cavity of the variable channel corner self-bending extrusion die; and 5, after metal flows through the variable channel corner self-bending extrusion die, the extrusion speed is controlled to be linearly distributed, sothat a bending part is directly extruded, the outer side surface of a profile is reduced or the cross-section deformation is avoided, and the flow of the metal in the extrusion process is smoother and the extrusion load becomes low; and he technical problems of rebound, wrinkling and cross-sectional deformation during bending processing of profile in the prior art is solved, and the technical problem of load during extrusion is solved.

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.

An ethylene-α-olefin copolymer, wherein the ethylene-α-olefin copolymer has a density of 860 to 950 kg/m³ and a melt flow rate of 0.01 to 100 g/10 min, wherein in a molecular weight curve measured by gel permeation chromatography, the molecular weight of the copolymer providing the highest peak exists within the range of 10,000 to 20,000, wherein the height of the peak at a molecular weight of 177,000 is 5 to 30% where the height of the highest peak is 100%, wherein a characteristic relaxation time of the copolymer satisfies a relation represented by formula (1), and wherein the ethylene-α-olefin copolymer exhibits more than one melt peak observed by a differential scanning calorimeter.

40.2×MFR^−0.606<τ<71.8×MFR^−0.175  (1)

The invention provides a streamline self-bending extrusion die and a design method thereof, and relates to the technical field of dies, and the design method comprises the following steps: designing a boundary control curve on one side of the cross section of a die cavity based on a sine function; designing boundary control curves on the two sides of the section of the die cavity to be asymmetric; performing smooth transition based on the boundary control curves on the two sides to obtain a curved surface control function of the mold cavity; arranging a working belt structure is behind a die cavity of the extrusion die, wherein the wall surface of the working belt structure is parallel to the extrusion direction; by means of the streamline die cavity of the extrusion die, non-uniform flowing can occur in the material extrusion process, then a self-bending extrusion profile is obtained, flowing of the streamline die cavity is closer to a real material flowing path, the streamline adaptive die can reduce extrusion loads, and local damage to the die is reduced; the technical problems of resilience, wrinkling and section deformation during bending processing of the profile in the prior art are relieved, and the technical problem of load reduction during extrusion is solved.

The invention discloses a conveying structure used for triangular magnesium pipe sintering equipment. First telescopic air cylinders arranged symmetrically on guide rails on the two sides drive circular-arc-shaped first conveying clamps to synchronously clamp a doughy irregular mixture, the circular-arc-shaped inner surfaces extrude the doughy irregular mixture into a partially regular mixture, and the extruding load of an extruder can be decreased; and after a moist triangular magnesium pipe with the inverted triangle shaped section, extruding formed by the extruder, is cut into triangular magnesium pipe sections, second telescopic air cylinders on the two sides drive second conveying clamps to clamp the triangular magnesium pipe sections through slope surfaces adapting to the two side surfaces of the triangular magnesium pipe in shape, size and angle, so that the triangular magnesium pipe sections are conveyed to a subsequent dryer, first flexible pads and second flexible pads do notscrape or damage the surfaces of the triangular magnesium pipe sections which are not fixing formed yet, the supporting and clamping effect is good, and conveying is stable and reliable.