71results about How to "Improve internal and external surface quality" patented technology

The invention discloses a method for preparing metal micro-nano hollow spherical powder. The method comprises the main contents of: correspondingly immersing a tool electrode and a workpiece electrode into a working fluid, wherein a gap required by spark discharge is kept between the tool electrode and workpiece electrode; and switching on a pulse power supply to enable the tool electrode and the workpiece electrode to generate spark discharge to be molten and gasified, and meanwhile implementing supersonic vibration on the working fluid between the tool electrode and the workpiece electrode during the spark discharge process, so that the working fluid in the gap generates micro-bubbles, and molten and gasified metal materials of the tool electrode and the workpiece electrode are attached and sedimentated on the surfaces of the micro-bubbles to form metal micro-nano hollow spheres. By adopting the method disclosed by the invention, the prepared metal micro-nano hollow spherical powder has high degree of hollowness, the particle diameter ranges from 20 nanometers to 100 micrometers, the wall surface is not larger than 1 micrometer, and the proportion of the hollow spheres is high. The micro-nano hollow sphere exhibits special outstanding performances in terms of physics, chemistry, electromagnetics and photology, and can be widely applied to the fields of chemistry, metallurgy, material, aerospace and the like.

The invention discloses a spinning forming process of an extra-high-voltage shielding cover. A computer digitally controlled spinning machine is adopted to integrally process a plate material into the extra-high-voltage shielding cover. The spinning forming process comprises the following steps of blanking, preliminary spinning, inner hole turning, drawing and spinning, primary edge turning, trimming, secondary edge turning and polishing cleaning. The extra-high-voltage shielding cover produced by adopting the process is light in weight, small in thickness and high in material utilization rate. The welding processing is not needed, a welding device is not needed, all of processing can be finished only through one spinning machine, operation is simple and convenient, and the processing cost is reduced. A unique inner-turnup bending and spinning process is adopted, edges of workpieces are wrapped inside the workpieces, direct contact between the workpiece edges and the outside environment is avoided, the corrosion resistance is improved, and the service life is prolonged.

The invention discloses a large-diameter thin-wall cupronickel tube short process production method and belongs to the technical field of metal materials. Specific to the problems that large-scale extrusion equipment up to 5000 tons is needed to produce large-diameter thin-wall cupronickel tubes through a traditional technique of semi-continuous casting solid ingot casting, punching, extruding, acid pickling, drawing and annealing, the finished product rate is low and the cost is high, the invention provides a method for producing the large-diameter thin-wall cupronickel tubes. Hot and cold combination casting horizontal continuous casting is adopted to producing large-size cupronickel tube blanks, and then a hole enlargement or/and hole shrinkage drawing is adopted to machining and forming the large-diameter thin-wall cupronickel tubes. The method has the advantages of being small in equipment investment, short in technical process, free of acid pickling and the like. The outer diameter of horizontal continuous casting tube blanks is 110-350 mm, the wall thickness is 5-30 mm, the elongation coefficient of hole enlargement drawing pass is 0.80-1.0, and the elongation coefficient of hole shrinkage drawing pass is 1.1-1.5; the outer diameter of machined products is 100-320 mm, and the wall thickness is 3-20 mm.

The invention relates to a technology forming method of a small and medium-sized unmanned aerial vehicle composite material outer wing. The method comprises the following steps of forming mold manufacturing, front edge silicon rubber core mold manufacturing, film bag body manufacturing, outer wing front edge manufacturing, and outer wing main body manufacturing; after surface treatment is correspondingly carried out on bonding areas corresponding to the outer wing front edge and a main body front beam surface, and structure double-sided adhesive tapes with the same shape as that of the bondingareas are tore to remove isolation paper on one sides, the adhesive surfaces are adhered to the bonding areas of the outer wing front edge, then solating films on the other sides of the structural adhesive tapes are tore, and the outer wing front edge is horizontally embedded into a boss of the corresponding position of the outer wing main body through a positioning groove at the left end of theouter wing front edge so as to obtain a composite material integral structure outer wing product. According to the technology forming method, the problem of limitation of multiple curing forming, andthe uniformity of the product quality and the thickness are improved.

The invention provides a manufacturing method of a seamless steel pipe for a long pipe trailer gas cylinder with a diameter of 920mm, and belongs to the manufacturing technology of large diameter seamless steel pipes. The manufacturing method comprises the steps that the chemical composition of seamless steel pipe materials is optimized, and the hardenability of the composition is improved; afterusing a 820 cross rolling mill to pierce, a waste pipe is rolled, a jacking type hot expanding unit is used for expanding the diameter, a hydraulic type straightening machine and a six-roll straightening machine are used for two-step straightening and rounding, and a precision cold drawing unit is used for two cold pullout. According to the manufacturing method of the seamless steel pipe for the long pipe trailer gas cylinder with the diameter of 920mm, the manufacturing cost is low, the material utilization rate is high, and the mode of production is flexible; and moreover, the phi 920mm seamless steel pipe manufactured by the method has high geometric accuracy, good internal and external surface quality, good hardenability and high comprehensive performance, and the range of the actual weight of a finished product exceeding the theoretical weight does not exceed 7.5%.

The invention belongs to the technical field of molding of resin-based composites and relates to an RTM (resin transfer molding) mold for partition type rotating structure composite parts. The mold comprises an upper mold, a lower mold, a middle partition combined type inner mandrel, an upper partition inner mandrel, an outer mold and moving sliders. During mold assembly, the middle partition combined type inner mandrel is placed into a positioning groove of the lower mold firstly, then the upper partition inner mandrel is placed on the middle partition combined type inner mandrel, the outer mold is placed on the bottom surface of the lower mold, the moving sliders are placed on the periphery of the outer mold, the upper and the lower mold are assembled oppositely, the gap between the upper mold and the lower mold is reduced gradually under the fastening effect of bolts, and the moving sliders move in plane to enable the outer mold to be placed in a theoretical position under the action of lateral inner mold surfaces of the upper mold and the lower mold. By design of the combined steel inner mandrels, the mandrels can be prevented from falling out of the inner cavities of the semi-closed partitions, and dimensional accuracy of the inner mold surfaces and flanges of the rotating structure is guaranteed.

The invention discloses a forming method of a cavity type composite material part with a lateral edge and a convergence hole. The forming method comprises the following steps: laying a prepreg piece on the outer surface of a male die (1) to form a material layer; taking the pre-compacted material layer off from the male die (1), putting the material layer into a combined female die (4) in a way with the opening of the material layer directed upwards, sequentially putting a soft die (2) and a core die (3) into the cavity of the material layer; packaging the combined female die (4) and the material layer into a vacuum bag and further performing compacting; sending the combined female die (4) and the material layer into an autoclave to enable the material to be solidified for formation; after solidifying for formation is completed, opening the combined female die (4) and taking out the solidified and formed finished product of the part. Since a laying method characterized by the combination of the male die (1) and the female die (4) is adopted and the problem of unloading of the core die is solved by adopting the soft die, parts of same kind can be smoothly formed.

The invention belongs to the technical field of glass pipe manufacturing, and particularly discloses equipment for inner overflow and outer overflow down-draw molding of a glass pipe, and a design method thereof. A purpose of the present invention is to solve the problem of how to produce a glass pipe with excellent surface quality and small thickness deviation. The equipment comprises an inner overflow device and an outer overflow device, wherein the inner overflow device comprises a first annular material supply barrel, a cylindrical core part and an inner overflow disc, and the outer overflow device comprises a second annular material supply barrel, a cylindrical core part and an outer overflow disc. According to the present invention, the flow rate of the glass liquid outflowing from the outlet can be uniformly distributed through the first narrow channel formed in the inner overflow device, the overflow is performed by using the inner overflow disc, the flow rate of the glass liquid outflowing from the outlet can be uniformly distributed through the second narrow channel formed in the outer overflow device, and the glass liquid is subjected to overflow by using the outer overflow disc, such that the good surface characteristic is formed so as to mold the glass pipe with excellent inner and outer surface quality and small thickness deviation.

The invention discloses a numerical control two-roll rolling machine provided with two flexible rolls and belongs to the technical field of machine manufacturing of rolling machines. Aiming at the problem that cylinders have scratches on surfaces when being rolled by the conventional two-roll rolling machine, the numerical control two-roll rolling machine adopts two polyurethane rubber rolls, the diameter of the upper rubber roll is smaller than that of the lower rubber roll, the hardness of a polyurethane rubber layer of the upper rubber roll is higher than that of a polyurethane rubber layer of the lower rubber roll, when a cylinder is rolled, the outer surface quality of a cylindrical part can be better, movement of a lower rubber roll lifting hydraulic cylinder is controlled through hydraulic servo under the condition that the upper rubber roll is not replaced, the distance between the upper rubber roll and the lower rubber roll is changed, cylinders with different diameters in a certain range and multi-curvature cylinders can be rolled, a structure-optimized unloading device is adopted and assisted by automation control, formed ends are prevented from being rolled together with tail ends when sheets are rolled by automatically lifting a cross beam, automatic unloading is realized, the rolling precision is further improved, and the automation degree is further increased.

The invention provides a processing method for improving quality of an inner surface of an austenite stainless steel tube. The method comprises the following step: successively carrying out solution treatment, straightening, pulling of a fixed mandrel and aftertreatment on a rolled austenite stainless steel insertion tube to obtain the austenite stainless steel tube with the high-quality inner surface. The processing method is simple in process, easy to implement, high in production efficiency and low in energy consumption; and the austenite stainless steel tube processed by the method is good in quality of the inner surface and the outer surface, even in structure and excellent in mechanical property; the yield of one-time detection in nondestructive test reaches 90% or above; and therefore, the processing method can be widely applied to the processing industry of stainless steel thin-walled slender tubes.

The invention provides a large-diameter thin-wall seamless tube rotation extrusion forming method. A tubular product blank with D0 and d0 as the external diameter and the internal diameter generates rotational motion with an angular velocity of omega and axial motion with a leftward speed upsilon under the action of a core rod and is sequentially subjected to extrusion deformation of an extrusion wheel and correction deformation of a shape correction wheel to obtain a high-precision tubular product with D and d as the external diameter and the internal diameter, wherein a circular passage is formed in the center of the extrusion wheel; the extrusion wheel is mounted on a right permanent seat through an extrusion wheel thrust bearing and an extrusion wheel antifriction bearing; the extrusion wheel thrust bearing bears axial thrust when the tubular product deforms; the extrusion wheel antifriction bearing ensures that the extrusion wheel can be driven to rotate when the tubular product forms; the shape correction wheel is mounted on a left permanent seat through a shape correction wheel thrust bearing and a shape correction wheel antifriction bearing; the shape correction wheel thrust bearing bears axial thrust when the tubular product deforms; and the shape correction wheel antifriction bearing ensures that the shape correction wheel can be driven to rotate when the tubular product forms. The large-diameter thin-wall seamless tube rotation extrusion forming method inherits the advantages of the three-dimensional pressure stress state forming of the extrusion process.

The present invention relates to one kind of variable wall thickness metal barrel and its making process. The variable wall thickness metal barrel is suitable for use in aviation, aerospace, weapon, chemical, petroleum and other fields. The variable wall thickness metal barrel has thick wall bottom part, middle transition part and thin wall upper part connected successively to form one integral. It is made with equal wall thickness tube and through rotary extrusion. The product of the present invention has novel structure, high surface quality, high size accuracy and reasonable making process.

The invention belongs to the surface treatment field and particularly relates to a surface treatment process for stainless steel. According to the surface treatment process, the surface quality of stainless steel equipment can be improved. The surface treatment process comprises the following steps: (A) pretreatment: firstly polishing the stainless steel surface, removing welding slag and spatter, removing oil stain and oxides on the surface and in a weld joint by virtue of acid pickling paste, and finally, removing internal and external impurities with clean water; (B) dipping the stainless steel into acid pickling passivation liquid until a silver white passivation film is formed on the surface and the color is uniform; (C) dipping the stainless steel into neutralizing liquid; and (D) soaking the stainless steel with clean water so as to remove surface-adhering solutions and impurities, and drying. The surface treatment process has the advantages that the surface color of the stainless steel is uniform and good in consistency, the surface quality of the stainless steel is high, furthermore, the service life of equipment or a part can be prolonged, the cost is low, the efficiency is high, and the like.

The invention relates to the field of manufacturing of dies, in particular to an autoclave die for improving the surface quality of a workpiece and a method. The autoclave die for improving the surface quality of the workpiece comprises a die body, a frame, a pressing plate, a pressing block, a demoulding bolt and a fastening bolt, wherein an annular groove is formed in the periphery of the workpiece on the die body, and the frame is embedded in the annular groove and provided with a demoulding bolt hole and a fastening bolt hole. According to the autoclave die, the die body guarantees the inner surface quality of the workpiece, and the frame, the pressing plate and the pressing block guarantee the outer surface quality of the workpiece. Accordingly, the autoclave die guarantees the roughness of the inner and outer surfaces of the workpiece and is simple in structure and low in cost.

The invention discloses a method for manufacturing a martensitic stainless steel continuous casting billet extruded seamless pipe. The method comprises the following steps of firstly, preparing a martensitic stainless steel continuous casting billet; secondly, peeling and segmenting the surface of the continuous casting billet; thirdly, drilling the continuous casting billet and processing a bellmouth on the end face; fourthly, cleaning and preheating the continuous casting billet; fifthly, carrying out induction heating and lubricant rolling on the continuous casting billet; sixthly, addinga lubricant to the bell mouth and expanding the hole; seventhly, carrying out induction heating again, adding lubricant inside and rolling the continuous casting billet with lubricant outside; and eighthly, preparing a tool and a mold and performing extrusion molding. According to the extrusion method for the martensitic stainless steel continuous casting billet provided by the invention, the rawmaterial is the continuous casting round billet, the defects of loose center, shrinkage holes and the like of the continuous casting billet are removed through outside peeling and inside drilling, thecenter quality of the continuous casting billet is improved through hole expanding, and the martensitic stainless steel seamless pipe is produced through an extrusion process. The seamless steel pipeproduced in the invention is low in manufacturing cost and good in inner and outer surface quality, and the size of the steel pipe can meet the requirements of customers.

The invention discloses a large-scale hollow profile extrusion forming method and device with a small-opening die utilized. The method includes the steps that inflation is conducted on a blank piece extruded from a die head through compressed air, a layer of narrow-seam-shaped air cushion with the same shape as the hollow shape of a product is formed in the blank piece, the blank piece is tightly attached to the inner wall of a vacuum shaping sleeve under further expansion of the air cushion, the hollow pipe product is formed under the synergistic effect of the air cushion and vacuum shaping, and the purpose that large-section hollow profiles are prepared continuously through the small-opening die is achieved. The device comprises an extrusion machine, the die head and a vacuum cooling shaping device which are sequentially connected. An inflation device is arranged in the die head and comprises a core rod, an air inlet pipe and an inner cold-air plug. The air inlet pipe is arranged in the middle of the core rod. The rod portion of the inner cold-air plug is arranged in the air inlet pipe. The head portion of the inner cold-air plug is arranged in a space between the die and the vacuum cooling shaping device. A blank forming runner is formed between the outer wall of the core rod and the die head. The method and device are simple in principle and easy to operate and control, and meanwhile the obtained product is wide in use range.