36results about How to "Improve ovality" patented technology

The invention discloses a waste heat recovering and utilizing system and method of a plastic pipe production line. The waste heat recovering and utilizing system comprises a heat recovering device arranged at an extrusion molding core mould, wherein the heat recovering device is connected with a raw material preheating bin; the heat recovering device comprises a heat recovering hole connected in from the core mould and connected with the center of an extruded plastic pipe. The waste heat recovering and utilizing method disclosed by the invention comprises the following steps: obtaining the temperature of the center of the plastic pipe of the extrusion core mould; sucking the heat by adopting a negative pressure fan; conveying the heat to the raw material preheating bin and other heat utilizing occasions; detecting the temperature in the core mould in real time, regulating a working parameter of the negative pressure fan; and detecting the temperature in the raw material preheating bin in real time so as to regulate inlet air heat. According to the waste heat recovering and utilizing system and method, high-temperature air is sucked from the interior of the plastic pipe and the sucked heat is used in production. Because the inner wall of the plastic pipe is effectively cooled, the difference of the temperatures inside and outside the plastic pipe is balanced, and no cracks are easily formed. Because the cooling speed of the plastic pipe is relatively high, the delivery speed of the pipe is high, and the yield is increased. Meanwhile, heat energy is recycled, so that the energy consumption is reduced.

The invention relates to a method for rolling high-precision titanium alloy pipes. A prepared titanium alloy pipe billet is rolled in a combination way of two rollers and three rollers, and the rolling method adopts single feeding and double slew. The value Q of two-roller rolling is 0.4-2, the value Q of multiple-roller rolling is 0.4-9, and the amount of clearance is 0.2-2mm. The rolled finished pipe is processed in a way of outer surface grinding and inner surface honing to obtain the titanium alloy pipes, wherein the outer surface roughness Ra is less than or equal to 0.6 micrometers, the inner surface roughness Ra is less than or equal to 0.2 micrometers, the outside-diameter size tolerance is less than or equal to 0.04mm, the inside-diameter size tolerance is less than or equal to 0.03mm, and the wall-thickness size tolerance is less than or equal to 3 percent of a nominal wall thickness. Compared with the prior art, the method has the advantages that the size tolerance precision of the obtained products is relatively high, and the inside and outside surface quality is relatively good.

A method for making an optical fiber preform having an ultimately low PMD (Polarization Mode Dispersion) through improvement of ovality is provided. This method has several collapse steps for collapsing an optical fiber preform having a clad / core deposition layer formed in a preform tube in which a rate of collapse is 0.01-0.06 mm / min at each collapsing step. By using this method, ovality and PMD of the optical fiber preform may be improved.

The invention discloses a wire drawing system for drawing a steel wire. The wire drawing system comprises a wire drawing machine, a guide roller frame and a rotary wire drawing device which are arranged in sequence, the wire drawing machine comprises a pay-off rack, the pay-off rack comprises a machine base and a pay-off channel arranged on the machine base, one end of the pay-off channel is connected with the wire drawing machine, and a bearing cover plate is arranged at a port of the other end of the pay-off channel; a pay-off roller is arranged on one side of the bearing cover plate; the guide roller frame comprises a machine base, a fixed box body arranged on the machine base and a guide roller set, the guide roller set is arranged in the fixed box body, and a steel wire passing opening is formed between guide rollers in the guide roller set; the rotary wire drawing device comprises a base and a box body arranged on the base, a barrel is arranged in the box body, a wire drawing cavity and a wire drawing die are sequentially arranged in the barrel body, the barrel body is sleeved with a worm gear, and the worm gear is connected with a worm. The rotating service life is prolonged, the workload of machine maintenance workers is reduced, the maintenance cost is reduced, the stopping maintenance time is shortened, and the working efficiency is improved.

The invention discloses a limiting device for heat treatment of a double-layer-structure welding assembly and a clamping method. The limiting device comprises an outer disc, an inner disc, a chassis,a centering shaft and a pressing plate, wherein the outer disc, the inner disc and the chassis are all disc parts with center holes and are assembled on the centering shaft; the peripheral surface ofthe outer disc is a first annular outer cylindrical surface; the first annular outer cylindrical surface is tightly attached to the inner surface of an outer layer structure of the double-layer-structure welding assembly; the peripheral surface of the inner disc is a second annular outer cylindrical surface; the second annular outer cylindrical surface is tightly attached to the outer surface of an inner layer structure of the double-layer-structure welding assembly; the pressing plate is connected with the upper end surface of the chassis through a first bolt; and an outer layer mounting edgeand an inner layer mounting edge of the double-layer-structure welding assembly are positioned between the pressing plate and the upper end surface of the chassis. The limiting device is adopted forclamping, so that the concentricity of the inner layer mounting edge and the outer layer mounting edge after heat treatment is guaranteed, the ovality of the inner layer mounting edge and the outer layer mounting edge is controlled, the concentricity of the inner layer mounting edge, the outer layer mounting edge and a large-end outlet section is guaranteed, the workload of calibration is reducedprior to turning, and the assembly requirements are met.

The invention relates to the technical field of die processing, and in particular, relates to an aluminum alloy large round tube die including an upper die and a lower die which are connected with each other; the middle of the upper die is provided with a tongue core, and the tongue core is arranged from a feed end of the upper die to a discharge end of the upper die; the tongue core is a frustumstructure having a spherical bulge at one end, and the spherical bulge is located at one side, close to the feed end of the upper die, of the tongue core; the other side, close to the discharge end ofthe upper die, of the tongue core includes a cylinder extending out of the upper die; the center of the end face of the cylinder is provided with a U-shaped through-hardening hole; the cylinder is provided with a first work zone and a second work zone successively along the direction from the feed end of the upper die to the discharge end of the upper die, and the cross section of the tongue corealong the direction from the feed end of the upper die to the discharge end of the upper die is step-like. The aluminum alloy large round tube die has the beneficial effects that the aluminum alloy large round tube die can effectively reduce the extrusion force, improves the strength of the die, improves the production efficiency, reduces the consumption of the die, and solves the problems of hard alloy ellipses and weld joints.

The invention relates to a machining process of a high-strength steel coil pipe. The machining process of the high-strength steel coil pipe sequentially comprises the following steps of blanking, edgemilling and beveling, pre-bending, three-roller type plate rolling machine roller bending, straight seam welding and ring welding; before the plate rolling machine roller bending is carried out, theresilience of a steel plate is measured firstly, then the pipe coiling diameter is calculated when an actual pipe forming is carried out, the total lower displacement amount of an upper working rolleris calculated in the pipe coiling forming process, the pass displacement of the upper working roller is determined, and the pipe coiling machining is completed through a plurality of plate rolling; the pass displacement of the upper working roller is gradually decreased, and the first-pass displacement amount accounts for 50% or above of the total lower displacement amount, and the first three pass total displacement finishes 90% or above of the total lower displacement amount, and the upper working roller is basically in place when at least the antepenultimate pass is carried out. Accordingto the process, the displacement of the working roller can be effectively controlled, so that a high-strength steel plate with a proper size can prepare a dredging pipe with good straightness on a plate rolling machine, the gap of a pipe body does not exceed 3 mm at the end of the plate rolling, and welding can be carried out without circle rolling is performed, and the ovality of the pipe body isless than or equal to 2 mm.

The invention belongs to the technical field of seamless steel tube multi-roll straightening, and specifically relates to a setting method of super large diameter seamless steel tube straightening roll flattening rate. The method comprises the following steps: solving maximal elastic-plastic flattening rate delta m and maximal elastic flattening rate delta t of a steel tube; according to a corresponding relation between wall thickness and the maximal allowed flattening rate of the steel tube, solving the maximal allowed flattening rate delta a of the steel tube; comparing the maximal elastic-plastic flattening rate delta m with the maximal allowed flattening rate delta a, taking a smaller value of the delta m and the delta a as flattening rate delta 2 of an intermediate roll, wherein flattening rate delta 1 of an entrance roll is equal to k1 delta 2, and flattening rate delta 3 of an exit roll is equal to k2 delta 2; according to a principle of satisfying actual flattening rate of a thin wall tube and a thick wall tube, determining actual flattening rate of each pair of straightening rolls, and realizing an aim of differentiated adjustment for straightening roll flattening rate bymeans of a pressing down system. The method, by setting the straightening roll flattening rate, can effectively improve ovality of the straightened steel tube and improve product straightening precision. The method is used for setting straightening roll flattening rate.

The present invention discloses a limited device and clamping method for the heat treatment of double -layer structure welding composition. The limit device includes the outer disk, inner plate, chassis, attentive shaft, and pressure plate.The disk, and the three are assembled on the heart axis.The outer surface of the outer disk is a first ring -shaped outer cylinder, and the inner surface of the inner surface of the outer structure of the first ring -shaped outer cylinder and the double -layer structure welding is tight;The outer surface of the inner structure of the inner structure of the second ring -shaped outer cylinder and the double -layer structure welding is tight; the upper end of the chassis is set with a pressure plate connected by the first bolt, and the outer installation edges of the outer layer of the double -layer structure welding component areThe inner layer is installed between the upper end of the pressure plate and the upper end of the chassis.The restriction device of the present invention is used for the installation of the installation of the inner and outer layers of the inner and outer layers of the inner and outer layers of the inner and outer layers.A pre -school volume to ensure assembly requirements.

The invention discloses a precise plastic forming method for a deep cup-shaped thin-walled part. Composite spinning forming process is used for processing. First calculate the size of the sheet blank with a large thickness, then use deep drawing and spinning to obtain thick-walled shallow cup-shaped parts, use flow spinning to obtain thin-walled deep cup-shaped parts, and use trimming and spinning to trim the mouth of the part and use The lathe cuts the bottom thickness of the part, resulting in a precisely formed, thin-walled, deep cup-shaped part. Compared with the stamping and deep-drawing forming process and the cutting process method, the forming method of the present invention effectively reduces the number of tooling and improves the quality indicators such as processing efficiency and part forming accuracy.

The invention relates to an aluminum-coated plate strip for kitchen ware and a production method thereof, the aluminum-coated plate strip comprises at least one layer of aluminum strip and at least two layers of steel strips, the upper and lower surfaces of the aluminum strip are coated with the steel strips, and the steel strips comprise the following chemical components in percentage by weight: 0.0015-0.005% of C, 0.001-0.005% of Si, 0.25-0.50% of Mn, less than or equal to 0.012% of P, less than or equal to 0.006% of S, 0.001-0.005% of Al, 0.004-0.012% of N, 0.0005-0.002% of B, 0.01-0.05% of O, 0.01-0.03% of V, 0.01-0.03% of Mo and the balance of Fe and inevitable impurities; and meanwhile, N is greater than or equal to 1.4 B + 0.6 Al, and V-1. 93 (N-1. 4B-0.6 Al) is greater than or equal to 3.65 C. The aluminum-coated plate strip not only has the strength of steel, but also has the characteristics of good heat dissipation and portability of aluminum, and also has good aluminum coating and drawing properties, the tensile strength of the aluminum-coated plate strip is greater than or equal to 320 MPa, the elongation is greater than or equal to 28%, the strength is not obviously reduced after nitriding treatment, the nitriding treatment requirement in kitchen ware production is met, and the aluminum-coated plate strip can be used for producing and processing novel kitchen ware such as a frying pan.

The invention discloses a preparation process of an anti-CO2-corrosion oil well pipe with a steel grade of less than 150ksi produced by a CPE unit. The process comprises the following steps: smelting each component by virtue of a converter according to the mass percentage proportion of each component, and performing continuous casting and continuous rolling on molten steel which is smelted by the converter to prepare a pipe billet, wherein the pipe billet comprises the following components in percentage by mass: 0.13-0.23% of C, 0.11-0.41% of Si, 0.8-1.0% of Mn, 5.0-6.0% of Cr, 0.05-0.45% of Mo, 0.02-0.04% of Al and the balance of Fe and inevitable impurities, and the total mass percentages are 100%. A steel pipe rolled by virtue of the process disclosed by the invention is good in surface quality and high in size precision, the anti-collapse performance of a pipe body can be effectively improved, the improvement of the anti-CO2-corrosion performance of the steel pipe can also be facilitated, the mechanical performance of the steel pipe can reach less than 150ksi, and the steel pipe is suitable for mining application of deep wells and ultra deep wells.

The invention provides a production method of an anticorrosion wear-resistant stainless steel HFW welding pipe with an outer diameter of 108-660.4mm, According to the method, the welding pipe is molded and sized by adjusting molding and sizing four-roll rigid rack equipment, oval precision of the welding pipe is up to + / -0.2mm and straightness of the welding pipe is up to 0.2mm / m; welding spots are protected by argon in a high frequency welding process of the welding pipe; a heat treatment temperature control range of welding seams of the welding pipe is between 800-900 DEG C, the welding seams and heat affected zone parts are subject to normalizing heat treatment and heat preservation time is 30-60s; pipe body positions at two sides of the welding seams are cooled by circulating water during air cooling, temperature is transferred to the welding seam positions of the pipe body of the welding body, overhigh temperature of the welding seams before the welding seams enter a water cooling section is prevented, and welding quality is not affected by structural transformation. The production method has the beneficial effects that the welding pipe produced by the method has better anticorrosion performance and magnetic conductive property, the straightness and ovality of the welding pipe are improved by 30%, equipment fault rate is reduced to 0.3% from 3%, service life is doubled, and the length of a one machine conveyor belt is improved to 6000m from 3000m.

A sintering apparatus for prefabricatnig the loosen optical fibre rod is composed of sintering quartz pipe with gas inlet and cover, heating unit with casing, insulating material and heater, moving controller, position sensor, gas supplying unit, temp sensor with heating driver, and controller.

The invention belongs to the technical field of multi-roller straightening of seamless steel pipes, and in particular relates to a method for setting the flattening amount of straightening rollers of super-large-diameter seamless steel pipes, comprising the following steps: calculating the maximum elastic-plastic flattening amount δ of steel pipes m and the maximum elastic flattening amount δ t ; According to the corresponding relationship between the wall thickness of the steel pipe and the maximum allowable flattening amount, the maximum allowable flattening amount δ of the steel pipe is obtained a ;Maximum elastoplastic flattening amount δ m and the maximum allowable flattening amount δ a For comparison, the smaller value of the two is used as the flattening amount δ of the intermediate roller 2 , the flattening amount δ of the entrance roller 1 =k 1 δ 2 , the flattening amount δ of the exit roller 3 =k 2 δ 2 ;According to the principle that the actual flattening amount of the thin-walled pipe and the thick-walled pipe meets the principle, the actual flattening amount of each pair of straightening rollers is determined, and then the purpose of differential adjustment of the flattening amount of the straightening rollers is realized by means of the pressing system. The invention can effectively improve the ellipticity of the steel pipe after straightening and improve the straightening precision of products by setting the flattening amount of the straightening rollers. The invention is used for setting the flattening amount of the straightening roller.

The invention relates to an unclear root welding process for a fan tower tube section. The specific steps include: S1, groove opening of the ring seam of the tube section; S2, a positioning ovality adjusting device; S3, grouping two adjacent tube sections ; S4, inner groove welding; S5, outer groove welding; S6, remove the outer locking mechanism. The invention has the following advantages: before the grouping, the ovality adjusting device is used to complete the rounding treatment of the two cylinder sections, so as to improve the accuracy of the grouping, at the same time, the welding quality is ensured, the operation steps of the spot welding of the grouping are omitted, and the internal stress concentration is avoided. Improve overall weld strength.

The invention discloses a steel pipe end rounding machine, which comprises a body, wherein two sections of rails are symmetrically arranged on the body; a driving vehicle is arranged on the rail; rotating rollers are arranged between the two sections of rails; a steel pipe is arranged between two rotating rollers; a fixing seat is arranged on the driving vehicle; a lower adjusting cylinder is arranged on the fixing seat; a piston rod of the lower adjusting cylinder is arranged at the lower end of a die bracket; the lower part of the die bracket is provided with a lower rounding die; the upper end of the die bracket is provided with a tension cylinder; a piston rod of the tension cylinder is connected with an upper rounding die; the upper rounding die is arranged on a lifting sliding rack; and the lifting sliding rack is arranged on the die bracket. The steel pipe end rounding machine is ingenious in structure and reasonable in design, and the function of improving the ovality of the pipe end of the steel pipes of different lengths and specifications.

The invention discloses a preparation method of a MgB2 multi-core superconducting wire. The preparation method comprises the following steps of 1, mixing magnesium powder and boron powder to uniform and loading the mixture into a sleeve, obtaining a single-core wire through performing a plurality of times of first drawing; 2, performing dimension fixing, cutting, straightening and pickling on thesingle-core wire, then assembling the single-core wire and a Cu / Nb composite rod with the same dimension into an oxygen-free copper pipe, thereby obtaining a copper pipe assembly; 3, successively performing a plurality of times of second drawing, a plurality of times of roller mold stretching and a plurality of times of third drawing on the copper pipe assembly; and 4, performing sintering processing on the copper pipe assembly after the third drawing, and finally obtaining the MgB2 multi-core superconducting wire. According to the preparation method, a process in which drawing and roller moldstretching are combined is utilized, thereby settling problems of core wire blocking layer rupture, core breakage and wire breakage caused by non-uniform deformation between core wires in the machining process of the MgB2 multi-core superconducting wire, improving product quality of the MgB2 multi-core superconducting wire and ensuring high superconducting performance of the MgB2 multi-core superconducting wire.