284results about How to "Improve straightness" patented technology

The invention discloses a low-welding crack sensitivity steel board and manufacturing method, which comprises the following parts: not more than 0.07% C, 0.15-0.40% Si, 1.00-1.60% Mn, not more than 0.015% P, not more than 0.010% S, not more than 0.30% Cu, not more than 0.50% Ni, not more than 0.30% Cr, not more than 0.30% Mo, not more than 0.08% V, not more than 0.08% Nb, 0.010-0.020% Ti, not more than 0.003% B, Fe and inevitable impurity. The invention is characterized by the following: (1)displaying lower welding crack sensitivity component with Pcm not more than 0.20%; (2)mating the strength and flexibility reasonably with fitful yielding ratio; (3)making the price and property of the steel board superior to the congeneric import product; (4)making the maximum breadth of steel board to 4000mm; (5)simplifying the technique to ensure higher flatness without quenching water.

The invention discloses a double-flexible-grinding-head magnetorheological polishing device. In the device, a vertical gantry of a bed body and an X-axis are both fixed on a horizontal base; a worktable is fixed on a sliding block of the X-axis; a Y-axis is fixed on a horizontal beam of the vertical gantry; and a first Z-axis and a second Z-axis are arrangedon the Y-axis in parallel. A large flexible grinding head is installed on the first Z-axis; and a small flexible grinding head is arranged on the second Z-axis. A high-flow circulation system connected with the large flexible grinding head and a low-flow circulation system connected with the small flexible grinding head are arranged on a trolley. A control cabinet is arranged at the rear part of the vertical gantry; and a circulation system cabinet and a cleaning system are arranged at the side surface of the vertical gantry. The double-flexible-grinding-head magnetorheological polishing device provided by the invention has the advantages of high accuracy, high rigidness, high stability and high dynamic property. The double-flexible-grinding-head magnetorheological polishing device not only can be used for processing of large-caliber phase elements, but also can be used for high-accuracy processing of large-caliber planar optical elements within the range of full caliber. The optimal matching of the processing efficiency and the processing accuracy can be realized.

The invention discloses a method for manufacturing an aluminum alloy hollow section for a sedan bumper, relates to a method for manufacturing an aluminum alloy hollow section, and aims to solve the problem that domestic limousine bumpers are low in tensile strength and non-proportional extension strength and dependent on import. The method comprises the following steps of: 1, preparing alloy melt; 2, casting an alloy cast rod; 3, cutting the cast rod off; 4, turning the cast rod to remove oxide; 5, performing homogenizing annealing; 6, heating a cast ingot; 7, extruding; 8, pre-straightening;9, quenching; 10, straightening; 11, aging; and 12, cutting according to length to obtain the aluminum alloy hollow section for an automobile bumper. The straightness and size of the hollow section prepared by the method completely meet the standards of imported bumpers, and the hollow section has high comprehensive mechanical properties. The method can be used for processing and manufacturing sections for limousine bumpers.

The invention provides a wear resistant cast iron roll collar used for aligning a steel rail and a preparation method, which belong to the technical field of steel rail processing. The prior wear resistant cast iron roll collar used for aligning the steel rail has the defects of easy occurrence of cracks, complicated manufacture process and the like in quenching process. The method is to compound a wear resistant outer layer with a magnesium iron inner layer into an integral roll collar by centrifuge casting, wherein the wear resistant outer layer comprises the following ingredients in weight percentage: 3.0 to 3.4 percent of C, 1.5 to 2.0 percent of Si, 1.2 to 1.6 percent of Mn, 0.2 to 0.4 percent of Nb, 0.03 to 0.06 percent of RE, 0.03 to 0.06 percent of Mg, 2.5 to 3.0 percent of Ni, 0.4 to 0.6 percent of Mo, 0.8 to 1.2 percent of Cu, 1.5 to 1.8 percent of Cr, 1.0 to 1.4 percent of V, 0.03 to 0.08 percent of B, 0.002 to 0.005 percent of Te, 0.01 to 0.03 percent of Ba, less than or equal to 0.06 percent of P, less than 0.03 percent of S, and the balancing being Fe. The invention has the advantages of high hardness of the roll collar, good wear resistance, simple production process and low production cost.

The invention discloses a steel plate for engineering machinery and a production method of the steel plate. The steel plate comprises the following chemical constituents by mass percent: 0.05-0.09% of C, 0.05-0.30% of Si, 1.5-2.0% of Mn, 0-0.025% of P, 0-0.005% of S, 0-0.07% of Nb, 0.08-0.15% of Ti, 0.10-0.30% of Mo, 0.015-0.06% of Als, 0.0010-0.0030% of Ca, 0-0.006% of N, and the balance of Fe. The steel plate is 3.0-8.5 mm in thickness. The steel plate disclosed by the invention is produced by advanced ultra fast cooling equipment and a 2250-mm wide flat steel thermal treatment line, which is unique at home, high in surplus of strength and ductility, excellent in impact toughness, low in postwelding strength loss rate, particularly low in anisotropism and unevenness, excellent in bending performance, and suitable for manufacturing the suspension arm for a crane and other engineering machinery and vehicles.

The invention belongs to the field of electric fluid dynamics spray printing, and discloses a complex surface circuit conformal spray printing method and equipment. The equipment comprises a spherical motor module, a translation module and a conformal spray printing module. The translation module drives the spherical motor module to move in an X-axis direction and a Y-axis direction in a plane; the conformal spray printing module comprises a spray head part and an electric signal part; the spray head part moves up and down so as to realize a freedom degree of a Z-axis direction; the electric signal part applies voltage on an ink fluid and an electrode ring in an ink cartridge; the spherical motor module rotates around the X-axis direction, the Y-axis direction and the Z-axis direction so as to realize six-degree-of-freedom motion of an object to be spray-printed; a curve surface base plate is grounded, so that the electric potential of the object to be sprayed-printed is zero; and the voltage applied in the ink fluid is higher than the voltage applied in the electrode ring, so that a gradient electric potential difference is formed on the ink fluid, the electrode ring and the object to be spray-printed. Through the complex surface circuit conformal spray printing method and the equipment provided by the invention, a conformal patterning electric spray-printing process of a complex surface is realized, an application range of the electric spray-printing process is improved, the manufacturing cost is reduced, and the printing accuracy is improved.

The invention belongs to the field of rolling of metal composite plates, and particularly relates to a method for smoothing continuous ply rolling of metal-based composite plates. The method comprisesthe steps of rolling a blank by using a two-roll mill with corrugated rolls on the top and the bottom to obtain a corrugated composite plate of which the upper surface and the lower surface are corrugated; carrying out annealing treatment; heating or cooling the annealed composite plate to a required temperature according to process requirements; and rolling and flattening the composite plate byusing a two-roll mill or four-roll mill with common flat rolls on the top and the bottom to obtain a corrugated flattened composite plate of which the upper surface and the lower surface are planes. During first-pass rolling through the corrugated rolls, rolling force changes in a stepped manner, thus, large stress can be generated at a position of a trough of a rolled piece, metallurgical bondingof metals is promoted and is gradually diffused towards two sides, during second-pass rolling through the flat rolls, the original wave crest position with small stress can generate peak stress againdue to increasing of rolling reduction, and metallurgical bonding on a whole contact surface is promoted again.

The invention relates to super-thick EH36 steel for an offshore wind power pipe pile. The super-thick EH36 steel for the offshore wind power pipe pile comprises the following chemical components in percentage by mass: .015 to 0.18 percent of C, 0.15 to 0.30 percent of Si, 1.40 to 1.60 percent of Mn, less than or equal to 0.0070 percent of P, less than or equal to 0.0030 percent of S, 0.050 to 0.070 percent of Nb, 0.015 to 0.030 percent of V, 0.08 to 0.020 percent of Ti, 0.030 to 0.050 percent of Al, 0.15 to 0.40 percent of Ni, 0.10 to 0.20 percent of Cr, and the balance of Fe. A production process flow comprises the following steps: performing converter operation, performing LF refining, performing vacuum degasifying, performing Ca treatment, performing continuous casting, dehydrogenizing, rolling, performing air cooling, performing high-temperature hot straightening, and normalizing. According to the production process flow, the super-thick EH36 steel of 90 to 120 mm for the offshore wind power pipe pile, which is high in unit weight, high in strength, high in impact toughness, small in thickness tolerance and high in straightness and does not have a surface defect is obtained.

The invention mainly discloses a fabric cutting table with a cleaning device. Its technical proposal includes a workbench and a support frame. Both sides of the workbench are provided with chip falling grooves. The workbench is provided with a cleaning device. The cleaning device includes The driver, the chip suction pipe and the cleaning brush are respectively located on the left and right sides of the workbench. The driver is connected to the chip suction pipe. The driver drives the chip suction pipe to move back and forth on the workbench. The chip suction pipe is connected to the chip suction pump through the connecting pipe. The outlet end of the chip suction pump is connected with the first collection box, the bottom of the chip suction pipe is uniformly provided with chip suction holes, the cleaning brush is detachably connected with the chip suction pipe, and the bottom surface of the cleaning brush is provided with bristles. The invention has a simple structure, and through the joint action of the chip suction pipe and the cleaning brush, it is convenient to remove waste cloth and broken threads on the workbench, greatly improving the cleaning speed and efficiency, reducing the amount of manual labor, and saving manpower.

The invention discloses a hot rolling method for a wide and thin size high-strength cold-rolled base plate for an automobile. After continuous casting billets are assembled in a heating furnace in a hot state, the Cu accumulation amount of iron oxide scales and steel substrates is reduced by adopting high-temperature preheating and high-temperature rapid heating technologies; after rough rolling, the thickness of an intermediate billet is reduced, a heat holding cover is used for reducing temperature drop and temperature differences of all parts, so that the finish rolling entry temperature of the intermediate billet is increased; and loads of all racks for finish rolling are reduced, and the stability of finish rolling is improved. In the process from finish rolling to steel belt coiling, a controlled rolling and controlled cooling technology is adopted, so that the cold-rolled base plate has excellent uniformity between the shape and the structure property. According to the method, the cold-rolled base plate with the thickness of 1.5-2.5 mm and the width of 1650-2000 mm can be obtained; the convexity degree of a steel belt is controlled to be in a range between 45-15 mu m and 45+15 mu m; the straightness is controlled to be 30I; the thickness accuracy is in a range between -30 mu m and +30 mu m; the structure property of different edges of the head, the middle, the tail of the steel belt is uniform; and the yield and the production efficiency of the wide and thin size high-strength cold-rolled base plate can be increased and improved, so that the cold-rolled base plate meeting the requirements of the actual product quality and the performance is provided for steel plates with the grade of 450-590 MPa for automobile covering parts.

The invention discloses a roller with flexibly adjustable roller type curves. A plurality of groups of electric heating temperature control expansion rods are mounted inside a through hole of a roller body by means of stationary fit, and the electric heating temperature control expansion rods generate radial expansion deformation and form internal expansion driving force by directly using inductance heat (or resistance heat), so that the roller body is driven to radially deform. A heat-insulation distance ring is mounted between each two electric heating temperature control expansion rods, so that heat flow is directionally and radially conducted, and the expansion rods drive the roller body to radially deform. When different current is supplied to the groups of electric heating temperature control expansion rods respectively, a roller profile can be segmentally adjusted. Therefore, various continuously variable high-level roller type curves can be generated to flexibly adjust strip shapes. The roller has the effects of compensating roller wear and eliminating local high shape waves.

The invention relates to a steel-aluminum compound rail production line belonging to production equipment of devices for supplying power for rail transit. The steel-aluminum compound rail production line is characterized by adopting a steel-aluminum composite host 1 and a shaping machine 2, a plurality of conveying mechanisms 4 and a traction machine 3 are arranged in front of and behind steel-aluminum composite host 1 and the shaping machine 2 so as to form a steel-aluminum composite rail production line. The host 1 consists of a pre-compounding group 5, a main compounding group 6, a repeated compounding group 7, a vertical regulating mechanism 8 and a horizontal regulating mechanism 9. Rollers on the production line rotate at same linear speed, a stainless steel tank 29 of more than or equal to 15 meters long is put in a trough of an aluminum section 27 to be pressed vertically and horizontally and force a support lug to be deformed, and the steel and the aluminum are compounded into a whole as conductive steel-aluminum compound rail 22. The steel-aluminum compound rail production line has high automation level, good product linear speed and fast production, is firm for compounding of the stainless steel and aluminum, and can produce steel-aluminum compound conductive rails of different varieties and different sections.

The present invention provides a pneumatic tire by which workability when molding a tire and tire durability performance can be enhanced without increasing tire weight when providing a reinforcing layer formed by aligning a plurality of monofilament steel wires and embedding this plurality of monofilament steel wires in rubber. The pneumatic tire of the present invention includes a reinforcing layer formed by aligning a plurality of monofilament steel wires and embedding said monofilament steel wires in rubber. Each of the monofilament steel wires is provided with twisting around an axis thereof, and a wire surface twisting angle θ with respect to an axial direction of the monofilament steel wires is not less than 1°.

The invention discloses a precision measuring device based on circularity cylindricity and a measuring method thereof, and relates to an industrial large size external diameter and internal diameter measuring technology field, especially relates to precision measuring device based on the circularity cylindricity and the measuring method thereof. The precision measuring device comprises a measuring device body, which comprises a base (1) and a control platform (13) disposed on the base. The upper part of the control platform is provided with a control panel (12), a gas floatation main shaft (6), and a gas flotation vertical column guide rail (10). The upper part of the gas floatation main shaft is provided with an aligning leveling working bench (7), and the front part of the gas floatation vertical column guide rail is horizontally provided with a horizontal guide rail (11). The front end part of the horizontal guide rail is provided with a sensor support (9), and a sensor (8) is connected with the horizontal guide rail by the sensor support. A lower computer (3) is connected with the precision measuring device by a USB and Ethernet, and is used to feed information back to an upper computer. A computer display (4) is used for real-time display. The precision measuring device is not limited by an industrial computer, and has advantages of high precision, easy operation, stable transmission, and high transmission efficiency.

The invention aims at the defects of low processing efficiency and low machining precision when a gear shaft is upset in the prior art, and provides a gear shaft forming method and die adopted by the same. The die comprises a stamping die and a main die, wherein a stamping die cavity matched with the outer surface shape of a gear of the gear shaft is formed in the stamping die; a main die cavity matched with the outer surfaces of a shaft lever part and a spline part of the gear shaft is formed in the main die; the upper end of the stamping die cavity is coaxially communicated with a front bar beating hole; and the lower end of the main die cavity is coaxially communicated with a rear bar beating hole. During the upsetting, a reverse strong beam is used for forming the gear in the stamping die cavity and forming the spline and the shaft lever in the main die cavity. With the adoption of the method and the die, not only can the gear teeth and the spline be formed once, but also the obtained gear shaft has high grades in straightness and precision, and the production efficiency is also improved.

The high precision tungsten plate producing process is especially suitable for producing high precision shielding tungsten plate for CT machine. The production process includes coating the blank tungsten plate with graphite emulsion of 15-20 wt% concentration, rolling after homogeneous heating, electrolytic polishing and pressurizing flattening. The said process is suitable for production of high precision tungsten plate with thickness deviation within 0.01 mm, flatness within 0.005 mm, lower surface roughness and sizes 0.203x146.05x257.05 mm.

A light guide plate for a backlight. The light guide plate includes: a light source unit for generating light; a light guide plate proximate to the light source unit and including an upper surface and a lower surface; and a light emission pattern configured to diffuse a portion of the light directed toward an image display panel, and a first straight pattern configured to channel the light along a direction substantially parallel to a direction of propagation of the light generated by the light source unit, both the light emission pattern and the first straight pattern being disposed on one of the upper surface and the lower surface of the light guide plate, in which the first straight pattern has peaks and valleys formed in alternating and repeating manner in a direction substantially perpendicular to a direction of propagation of the light generated by the light source unit.

The invention relates to a part of a thin-film solar cell manufacturing device, in particular to an EVA film hob cutting device of a thin-film solar cell. The EVA film hob cutting device comprises a knife rest which is used for installing a cutting knife, wherein the bottom of the knife rest is fixedly connected with a slide block, the slide block is mutually matched and positioned with a fixed linear guide track under the slide block, the slide block and the knife rest can move along the linear guide track, an upper knife shaft, a lower knife shaft and a rubber wheel shaft are arranged on the knife rest, one of the upper knife shaft, the lower knife shaft and the rubber wheel shaft is a driving shaft driven by an electric motor, the other two shafts are synchronously driven by the driving shaft through a driving mechanism, the ends of the same sides of the upper knife shaft and the lower knife shaft are respectively provided with an upper hob and a lower hob which can rotate along the upper knife shaft and the lower knife shaft, the edges of the upper hob and the lower hob are provided with interlaced and bonded parts, at least one rubber rolling wheel is arranged on the rubber wheel shaft, and the bottom of the rubber rolling wheel is pressed on the top surface of the linear guide track. The EVA film hob cutting device can automatically cut an EVA film of a thin-film solar cell and has high automation degree and high machining precision.

The invention provides a flax fiber and tencel fiber blended yarn and a preparation method thereof. The flax fiber and tencel fiber blended yarn comprises 35 to 40 weight percent of flax fiber and 60 to 65 weight percent of tencel fiber, wherein the twist degree of the blended yarn is 21.32 to 23 T/inch; the average strength of the blended yarn is 300 g; and the elongation percentage of the blended yarn is 14.1 percent. The flax fiber and tencel fiber blended yarn combines moisture absorption, perspiration, antibacterial effect and the like of the flax fiber and the healthy environmentally-friendly characteristic of the tencel fiber, has the advantages of natural environmental friendliness, cooling performance and antibacterium, and can be applied to clothing fabrics and other industries.

The invention discloses a metal powder tube forming die and a metal powder tube preparation method. A high-temperature resistant glass tube is used as a rigid die for pressing, the glossiness, the roundness and the linearity of product surfaces are greatly improved, pressing pressure is reduced, so that the porosity of a metal powder filter tube is greatly improved, the fluid infiltration capacity of a die tube is increased, and a filter die tube blank is filled with high-temperature resistant aluminum oxide ceramic balls serving as internal supports. Therefore, adverse consequences such as collapse and deformation of a powder tube caused by non-uniform contraction in the contraction process during sintering are greatly reduced, and the yield of products is improved. Besides, as the aluminum oxide ceramic balls are placed into the filter die tube blank to serve as the internal supports, the placement mode of the die tube blank in a furnace can be improved, the blank can be horizontally placed in the furnace and can also be vertically placed and sintered, and the requirement for furnace types is relaxed.

The invention relates to a planetary inclined roll rotary hub straightening machine, comprising a rotary hub, a first power driving device for driving the rotary hub to rotate, at least two groups of straightening rollers arranged in the rotary hub and a second power driving device for driving the rotation of the straightening rollers. An upper straightening roller and a lower straightening roller of every group of the straightening rollers are symmetrically arranged at the two sides of a rotating axis and the straightening rollers are inclined in certain angle corresponding to the rotating axis. A structure combining the straightening rollers which can autorotate with the rotary hub which can implement revolution is adopted. Therefore, previous driven straightening rollers in the rotary hub are changed into driving straightening rollers. The rotating speeds of the rotary hub and the straightening rollers are matched to eliminate the puppet rotating phenomenon of straightened roundwood. The contact and the compression bending state of the straightening rollers and the straightened roundwood are improved, and the straightness is improved. The straightening rollers driven by a hydraulic motor clamp the straightened roundwood tightly and roll around the straightened roundwood to ensure the roundness. The planetary inclined roll rotary hub straightening machine is very beneficial to the straightening of super-long thin wall pipes.

The composite material box body structure for storage and transportion box of missile is characterized by that said box body structure possesses the shallow arched single shell plate structure with longitudinal reinforcement member and transverse reinforcing rib and correspondent symmetrical layer-spread form, its four-side base plate of said box body structure is made up by using four-side small arch degree and shallow arched shell plate and four-corner cylindrical shell plate which are smoothly connected togher, along the length direction of base plate of box body the transverse reinforcing ribs are uniformly-spaced and placed, two ends of said box body adpots the all-composite material flange flanges which are connected with box body base plates together and formed into one body, so that said box body structure possesses high specific strength.

The invention provides an improved main frame of an offshore net cage. The main frame consists of a floating pipe, and is characterized in that the floating pipe is a hollow elliptical pipe with a horizontal long axis and is prepared by processing a round pipe with relative draught of 10%-20%, and the relative draught refers to the percentage of the ratio of the amount of draught to the blank diameter before flattening. The improved main frame for the offshore net cage is reasonable in structure, high in operability, saved in cost, steady in connection, and improved in stability, anti-typhoon capability and risk prevention capability; and the main frame is mainly used for improving the strength and improving the wind and wave prevention level on the premise of not changing the overall size of an existing main frame, promoting offshore net cage culture to deep open sea areas, and realizing safe culture production in open sea areas with water depth of 20-60m.

The invention relates to a plastic processing method for a magnesium alloy capillary tube, which comprises the following steps: heating a magnesium alloy casting billet to 100-300 DEG C, pre-heating a rod extrusion die to 300-450 DEG C, performing extrusion, controlling the extrusion ratio to be 10-25 and controlling the extrusion speed to be 20-30mm/s; intercepting a magnesium alloy rod with the length of 10-50mm after annealing, and processing into a tube blank; placing the tube blank into a divided flow extrusion die for extrusion under the conditions that the extrusion temperature is 100-300 DEG C, the extrusion ratio is 16-64 and the speed of a punch head of the extrusion die is 20-30mm/s, and getting the capillary tube with the wall thickness of 0.1-0.5mm and the length of 300-1000mm; and then performing destressing annealing treatment and getting the magnesium alloy capillary tube. The process is simple, the cost is low, the processing efficiency is high, the manufactured magnesium alloy capillary tube has good surface quality, the tube wall thickness is uniform, the flatness is ideal, structure is uniform, the mechanical properties are higher, and the plastic processing method can be used for manufacturing a stent in blood vessel.

A light source device includes a light source section that emits laser beam, a member reducing light quantity unevenness of the laser beam, a diffusion member that is provided in a traveling optical path of the laser beam between the light source section and the member reducing light quantity unevenness and diffuses the laser beam, a detection element that detects a physical characteristic of the diffusion member and outputs a state detecting signal, and an abnormal state determiner that determines an abnormal state of the diffusion member based on the state detecting signal.

The invention provides a protection cable skinning knife which comprises a handheld cylinder. A tightening mechanism is arranged on the upper end of the cylinder. The tightening mechanism comprises a ring with an internal thread and a tightening cylinder with an external thread. The ring sleeves the tightening cylinder, and is in matching connection with the tightening cylinder through the internal thread and the external thread. The tightening cylinder is composed of a number of tensioning bars, and extends outward along the upper end of the cylinder to form a cone with tapering bore. The axes of the tightening cylinder and the cylinder are superimposed. Two rod-shaped tools are symmetrically arranged on the upper end of the tightening cylinder, and a tool tip is arranged on the upper end of each tool. A tool rod is arranged on the lower end of each tool. The tool rods and the tensioning bars are hinged. An arc-shaped part is arranged on the front end of each tool tip. An arc-shaped notch with an outward opening is arranged below each arc-shaped part. An arc-shaped blade is formed on the inner side of the upper part of each arc-shaped notch. The arc-shaped blades of two tools are inwardly corresponding. According to the invention, a cable skinning effect is improved; skinning time can be greatly reduced; when skinning is carried out, a cable core wire can be effectively protected from being scratched; the whole protection cable skinning knife sleeves a cable; and the protection cable skinning knife has the advantages of easy use and time and effort saving.

The invention discloses a method for producing a checkered steel plate by applying a CSP (Cast Steel Plate) process. In the method, a rotating furnace for smelting, an LF (Low-Frequency) refining furnace and CSP continuous casting and rolling equipment are applied, and a controlled rolling and controlled cooling process is adopted. The checkered steel plate produced by applying the CSP process has the advantages of high strength, good forming property and accurate thickness precision, convexity, straightness and width of plate; and in addition, the product of the checkered steel plate has more uniform and stable property and higher longitudinal and horizontal precision.

The invention relates to a four-point-bending over-bending straightening process method for large shaft tube parts and is characterized in that two lower dies are arranged on a workbench of a forming press, two upper dies are connected to a beam of the forming press, and a shaft tube part is placed among the two upper dies and the two lower dies under the beam of the forming press; the distance between the two lower dies is determined by calculation, the distance between the two upper dies is determined by calculation, and the positions of the upper dies above the lower dies, and the rolling reduction of the two upper dies are determined by calculation; the distance between the two upper dies and the distance between the two lower dies are respectively adjusted to the expected position; then, the shaft tube part is pressed, after the pressing is finished, the upper dies move upwards along with the beam of the forming press; and whether the straightness of the shaft tube part meets requirements or not is inspected, if not, the steps are repeatedly carried out until the requirements are met. The four-point-bending over-bending straightening process method for the large shaft tube parts has the advantages that the finally-finished shaft tube part is deformed uniformly and realizes smooth transition, and the straightness of the parts better meets the requirements; residual stress existing in the parts is smaller, and the distribution of the residual stress is uniform; and meanwhile, the forming cycle is shortened, and the working efficiency is improved.

The invention discloses a section steel straightening device, which comprises a straightening roll system, wherein the straightening roll system is arranged on a body; an output end of the straightening roll system is also provided with a rolling and straightening roll system; the rolling and straightening roll system comprises at least one pair of upper and lower rolling and straightening rolls and at least one pair of left and right rolling and straightening rolls; the upper and lower rolling and straightening rolls are symmetrically arranged on the upper and lower sides of a pass steel wire and a roll gap I for passing through section steel is formed between the two rolls; and the left and right rolling and straightening rolls are symmetrically arranged on the left and right sides of the pass steel wire and a roll gap II for passing through the section steel is formed between the two rolls. According to the section steel straightening device and a section steel straightening method, lateral bending of straightened section steel can be effectively improved, and the length of a straightening blind zone of a main bend of the section steel is reduced, so that the section size of the section steel is better, the flatness is higher, the residual stress is smaller, and particularly height difference existing in rail level of the straightening blind zone and a straightening zone can be effectively reduced and the yield of a steel rail is increased when the steel rail is straightened.

The invention discloses a cultivation method of high-bole sinojackia xylocarpa, belonging to a plant cultivation method. The method comprises the following steps: (1) carrying out fix planting on annual sinojackia xylocarpa in soil in spring, fully watering root fixing water, and carrying out intertillage weeding management; (2) hilling to 10-15cm in depth after the leaves of the sinojackia xylocarpa fall in winter and before nursery-grown plants bud in early spring; (3) pruning and cutting back in the second-year spring and summer; (4) carrying out water and fertilizer management after pruning in the step (3) and before the end of July; and (5) pruning and cutting back again after the leaves of the sinojackia xylocarpa fall in autumn and before the sinojackia xylocarpa sprouts in the next spring. According to the invention, through twice reshaping and pruning, the growth advantages of the trunk of the sinojackia xylocarpa seedling is enhanced, the height and straightness of the trunk are increased, good crown type is cultivated, the clump bushwood shaped tree shape formed by natural growing of the sinojackia xylocarpa is changed, and the ornamental value of the sinojackia xylocarpa is greatly improved.