33results about How to "Improved Wall Thickness Accuracy" patented technology

The invention discloses a method for preparing a composite pipe by expanding a secondary pouring dual-metal pipe billet. The secondary pouring dual-metal pipe billet is manufactured by the following steps: by adopting an evaporative pattern casting process, pouring to obtain an inner-layer thin-walled high-alloy corrosion-resistant pipe billet, and by adopting a sand casting method, pouring to obtain an outer-layer carbon steel pipe billet, thereby obtaining the dual-metal pipe billet. The expanding process is characterized by comprising the following steps: by adopting the dual-metal pipe billet prepared by secondary pouring, performing three-roller hot-rolling expanding deformation, thereby obtaining the dual-metal composite pipe. According to fusion of the inner and outer layers of metals in the casting process and plastic deformation in the hot-rolling expanding process, the dual-metal composite pipe with good metallurgical bonding property can be obtained. According to the dual-metal composite pipe disclosed by the invention, the high-precision inner-layer metal surface is obtained by virtue of the evaporative pattern casting process, and the inner-layer metal thickness is controllable; and moreover, due to the three-roller hot-rolling expanding process, high-strength metallurgical bonding among the inner and outer layers of metals is realized, the inner-layer surface precision is high, the ellipticity is high, and the wall thickness precision is high.

The invention discloses a method for manufacturing a cylinder barrel for a hydraulic cylinder. According to the method, a hot rolled coil plate serves as a raw material, and the method comprises the following steps that (1) a coiled plate is cut into strip steel; (2) the strip steel forms a welded pipe by ERW welding; (3) tempering heat treatment is carried out on the welded pipe; (4) cold reduction is performed on the welded pipe; (5) precise straightening is performed on the welded pipe; (6) nondestructive detection is performed on the welded pipe; (7) the fixed ruler of the welded pipe is cut off; and (8) finish machining is performed on the inner surface and the outer surface of the welded pipe. According to the method, the outer diameter and the wall thickness of the ERW welding pipeare fully utilized, the material with high precision and tempering heat treatment is high in strength and toughness, the high-precision and high-precision high-surface finish is achieved, the efficiency is high, the straightness and the roundness of the steel pipe are improved precisely, the straightness and the roundness of the steel pipe are improved, the reliability of the cylinder barrel is improved without damage detection, the outer circle machining allowance is small when the multi-stage cylinder is used, the efficiency is high, and the high concentricity of the welded pipe and the machining allowance of scraping and rolling of an inner hole are small and high in precision and efficiency.

The invention discloses a preparation method for a bimetal metallurgy composite pipe of a three-layer structure. The method includes the steps that firstly, a thin-walled high alloy anti-corrosion pipe blank on the inner layer and a thin-walled high alloy anti-corrosion pipe blank on the outer layer are prepared through pouring according to a lost foam casting method; then, an interlayer carbon steel pipe blank is prepared through pouring and EPS modeling with the high alloy pipe blanks on the inner layer and the outer layer as mold cores, and a stainless steel/carbon steel/stainless steel bimetal composite pipe blank of a three-layer structure is obtained; and the bimetal composite pipe of the three-layer structure is manufactured by conducting three-roller hot rolling expanding deformation on the obtained bimetal pipe blank of the three-layer structure. The high-accuracy metal surfaces on the inner layer and the outer layer are obtained according to the lost foam casting method, and the metal thickness of the inner layer and the outer layer can be controlled. The resistance to three-roller hot rolling expanding deformation is small. The three layers of metal are combined through high-strength metallurgy. The surfaces on the inner layer and the outer layer are high in accuracy, good in ovality and high in wall thickness accuracy.

The invention discloses a large-width aluminum alloy ribbed plate, a production method thereof and an extrusion perforating needle, and belongs to the field of aluminum alloy material processing. Theproduction method of the large-width aluminum alloy ribbed plate comprises the steps that an aluminum alloy ribbed pipe is manufactured through casting, preheating and extrusion, cutting and flattening are conducted after quenching, then heat treatment is conducted, and the ultra-wide, high-strength and high-corrosion-resistance large-width aluminum alloy ribbed plate used for a ship body is obtained. In addition, an extrusion perforating needle is provided for extrusion, and compared with extrusion of an aluminum alloy solid cast ingot, the performance can be further improved. According to the production method, the welding pass of friction stir welding adopted in order to achieve large-width aluminum alloy ship plate batch production in the prior art can be avoided, the number of weld joints is reduced, the overall strength and sealing performance of a ship are greatly improved, the production cost is reduced, and the production efficiency is improved.

The invention belongs to the technical field of metal press working (steel rolling), and relates to a steel rolling process for rolling deformation of a seamless steel pipe slant mill, so that a rolling deformation process is comprehensively improved, the deformation stability is improved, and problems in a skew-rolling seamless steel pipe production process are solved, that is, a rolling process method, equipment and technology are provided for overcoming quality defects of spiral ducts in the inner surface of a steel pipe and improving the quality. The core scheme is that a slant mill foreground and background mandrel adopts the full-supporting rolling process, equipment and technology. During skew-rolling deformation, the rolling mandrel is limited and clamped at an inlet of the slant mill and an outlet end at the same time in the rolling process, the mandrel is completely in a controlled and retrained state in the rolling process, and radial displacement of the mandrel in the skew-rolling process is reduced to the maximum extent. The effect of improving the rolling stability is achieved through cooperation of skew-rolling roller form design and rack novel structural design, the spiral ducts in the skew-rolling inner surface are eliminated or decreased to the maximum extent, and the quality of steel pipe products is improved. The skew-rolling process level of the seamless steel pipe is increased, and application and development of a skew-rolling process are promoted.

The invention belongs to the technical field of aeroengine hollow turbine blade investment precision casting, and particularly relates to a hollow turbine blade wall thickness deviation reverse regulation and control method based on ceramic core positioning compensation. The method comprises the following steps: 1) acquiring data of inner and outer contour points of an actual hollow turbine blade;2) carrying out three-dimensional iterative registration on the outline points of the blade and a design model; 3) calculating the pose drift amount of the ceramic core in the precision casting process; 4) calculating the reverse offset of the ceramic core; 5) reversely biasing the ceramic core design model; and 6) adjusting the size of the wax mold ceramic core positioning element. The problem that the wall thickness size of an existing aero-engine hollow turbine blade is out of tolerance seriously is solved. From the perspective of ceramic core pose regulation and control, the spatial poseof a ceramic core in a wax pattern is changed by adjusting the size of a ceramic core positioning element in the wax pattern mold, then a core shift wax pattern is formed, and finally the purposes ofimproving the position matching relation between a shell and the ceramic core and achieving accurate control over the wall thickness precision of the hollow turbine blade are achieved.

The invention relates to the field of steel pipe production, in particular to a plug for punching of large-hole series medium- and thick-wall capillaries. The outline of the plug consists of a punching section, an expanding section, a rolling section, a circling section and a reverse cone section. The front end surface of the plug adopts a flat head design, and a bar inserting hole is formed on the tail end of the plug; connection between the front end surface of the plug and the punching section is realized through arc transition, wherein the arc radius is R2, and the arc radius of the outline of the punching section is R3; the expanding section and the rolling section are cones, wherein the taper of the expanding section is a2, and the taper of the rolling section is a1; the outline of the reverse cone section is an arc of which the arc radius is R1; and the circling section is a cylinder.

The invention discloses a process for improving the wall thickness accuracy of a medium-thick wall pipe, comprising the following steps: S1, steel pipe casting: selecting a suitable steel ingot and melting the steel ingot and pouring the melted ingot to produce a pipe blank; S2, piercing machine correction: setting a keyway of a connecting sleeve at the top of a piercing machine as a semicircularkeyway; S3, cold centering machine punching detection: detecting punching of a perforator; S4, coefficient modification: changing the frame speed and tension coefficient of the hole type to 0.05+/-0.01; S5, centerline adjustment: ensuring that the rolling centerline of the piercing machine is consistent with the centerline of a piercing trolley, so that the force applied to the pipe blank during piercing is uniform. Through head technical modification, the system specification of the centering hole and the optimization of the tension coefficient of the sizing mill, the yield of the medium-thick wall pipe with the wall thickness of 16 to 35 of 273 pipes can be stabilized at 93 percent or more.

The invention relates to the technical field of seamless steel pipe perforation, in particular to an ejector rod of a seamless steel pipe perforating machine. The ejector rod comprises a hollow conical ejector head, a cylindrical connecting rod with an internal cylindrical hollow cavity, a connecting section, a three-roller guiding apparatus and a cooling water pipe, wherein the connecting rod is connected with the ejector head by virtue of a bolt, the connecting section is connected with the connecting rod by virtue of a bolt, the three-roller guiding apparatus is installed at the outer side of the connecting section, the connecting section consists of a first connecting section, a second connecting section, a combination of N third connecting sections and the second connecting section and a tail rod section, which are successively connected with one another. The connecting section of a traditional ejector rod is divided into a plurality of sections, a bearing is installed on the second connecting section, so that the second connecting section and the third connecting section can be increased according to a perforating length, and the dynamic unstable contact between the ejector rod and a guiding rod when in rolling can be effectively solved.

The invention relates to an online continuous roller hole pattern misplacement detection instrument and method. The online continuous roller hole pattern misplacement detection instrument comprises an upper hole pattern template and a lower hole pattern template which are provided with part cambered surfaces corresponding to continuous roller hole patterns and jointly form the continuous roller hole patterns. The instrument is characterized in that contact faces of the upper hole pattern template and the lower hole pattern template adopt a form that a slider is matched with a slideway, a zero position mark is arranged at the center of one of the hole pattern templates, the other hole pattern template is provided with a reference graduated ruler mark corresponding to the zero position mark, and multiple through holes convenient for hand-holding are distributed in faces of the upper hole pattern template and the lower hole pattern template. The instrument is simple in structure, reliable in use and simple to operate; hole pattern misplacement is adjusted and eliminated according to measured misplacement numeric value, so that the problem that existing continuous roller hole pattern misplacement is less prone to being timely found and dealt is solved, wall thickness accuracy of continuously rolled steel pipes is improved greatly, defective product rate is lowered remarkably, and production cost is saved.

The invention discloses a complex component machining residual wall thickness self-adaptive compensation method based on coordinate origin translation, and belongs to the technical field of measurement-machining integration. According to the method, on an open type numerical control platform, wall thickness data of a component is measured through an ultrasonic thickness measuring device, a machining target curved surface related to the residual wall thickness is reestablished, inclusiveness analysis is completed, coordinate origin translation amount calculation is conducted, and machining compensation is completed through machining code origin correction. According to the method, the defects of an existing residual wall thickness compensation method are overcome, the machining requirement that the residual wall thickness and the profile tolerance of the complex component are restrained at the same time is met, the machining precision is improved, the labor intensity is reduced, and self-adaptive compensation of the machining residual wall thickness of the complex component is achieved.

The invention belongs to the technical field of hot-rolled seamless steel pipes, and particularly relates to an asymmetric roller for a sizing and reducing machine. The asymmetric roller comprises oval rollers, and is characterized in that the oval hole type center lines of the oval rollers do not coincide with the center axis of the roller, and the oval hole type center lines of all the oval rollers deviate towards one side of the center axis of the roller by the distance E1. According to the asymmetric roller, on the premise that an original longitudinal rolling sizing and reducing unit is not changed, the traditional symmetric roller hole type design is changed, and through the bilateral asymmetry on the hole type design, a steel pipe bears a couple function in the sizing and reducing process; and the couples applied by all the rollers to the steel pipe are all in the clockwise direction or all in the anticlockwise direction, the steel pipe slightly rotates in the sizing and reducing process, the thickened segments of racks are staggered, the effect that the thickened segments of the racks are stacked in the same area is avoided, the inner square phenomenon of the steel pipe iseliminated, and the wall thickness precision of the steel pipe is greatly improved.

The invention provides a mica pipe manufacturing method which comprises the following steps: gluing mica paper to obtain mica glued paper; rolling the mica glued paper into a tubular shape to obtain a mica reel pipe; rubbing the mica reel pipe to obtain the mica reel pipe with uniform wall thickness; heating the mica reel pipe obtained after rubbing so that the mica reel pipe can be cured; cooling the heated mica reel pipe to obtain a tubular mica reel pipe; and processing the tubular mica reel pipe into the mica pipe. According to the mica pipe manufacturing method, the production difficulty of the mica pipe can be reduced.