30results about How to "Improve internal surface quality" patented technology

The invention discloses a method for preparing welded stainless steel pipes for boilers, which belongs to the technical field of welded stainless steel pipe manufacturing. The key points of the technical solution include steel strip unwinding, forming, welding, inner bead leveling, outer bead grinding, and heat treatment , Shaping and cutting, wherein the above-mentioned processes are carried out continuously in sequence, and the heat treatment adopts a brilliant heat treatment furnace. The welded stainless steel pipe processed by the method of the invention has the advantages of stable quality, low manufacturing cost and good surface quality, and is used for manufacturing pipes for boiler heat exchangers and condensers.

The invention discloses a reverse sealing process of a seamless gas cylinder, and relates to the technical field of gas storage cylinder closing process; the invention comprises the following steps: A, rotary wheel design; B, ferrule design; C, clamping workpiece; D , the adjustment of the workpiece; E, the preheating of the workpiece; F, the closure of the workpiece; The feature of thickening, combined with the advantages of smooth and smooth inner and outer surfaces of the positive closing, greatly improves the production efficiency and product quality, and realizes a technological breakthrough.

A starting material to be extruded made of a high alloy comprising, in mass %, Cr: 20 to 30% and Ni: more than 22% and 60% or less is heated to a temperature predetermined according to the contents of Mo and W and is subjected to a hot-extrusion process, the heating temperature T (° C.) satisfying a relationship of Formula (1), (2), or (3), which is expressed in terms of the average cross-sectional area A (mm2) of the starting material to be extruded, the extrusion ratio EL (−), and the extrusion speed V (mm / s). As a result, a high-alloy seamless tube can be produced without generating cracking and / or seam flaws.When 0%≦Mo+0.5W<4%: T≦1343−0.001322×A−1.059×EL−0.129×V  (1)When 4%≦Mo+0.5W<7%: T≦1316−0.001322×A−1.059×EL−0.129×V  (2)When 7%≦Mo+0.5W: T≦1289−0.001322×A−1.059×EL−0.129×V  (3)

The invention discloses a method for treating inner pit defects inside a continuous rolling carbon steel tube or a low-alloy steel tube. The method comprises the following steps: pickling by using an acid liquid which is prepared from the following components in parts by volume for the first time: 10-15 parts of 33% technical hydrochloric acid, 1-3 parts of nitric acid and 20 parts of water, subsequently performing grinding wheel polishing on the continuous rolling carbon steel tube with inner pit defects or inner pit areas of the low-alloy steel tube, and further pickling for a second time by using another acid liquid which is prepared from the following components in parts by volume: 10-15 parts of 33% technical hydrochloric acid and 20 parts of water, wherein the concentration of FeCl2 in the acid liquids for pickling is controlled to be 35-75g / L each time. By adopting the method of twice pickling and once grinding wheel polishing, the inner pit defects distributed in the inner surfaces of the continuous rolling carbon steel tube and the low-alloy steel tube are eliminated, the quality of the inner surfaces of cold-drawn steel tubes is improved, and the purpose of completely eliminating oxidized iron skin on inner surfaces of steel tubes is achieved.

The invention provides surface processing equipment. The surface processing equipment comprises a cantilever, a tool rest and a drive mechanism, wherein the cantilever is of a cuboid shape with a hollow inner cavity and is provided with a first end capable of extending into a deep cavity and a second end opposite to the first end; the tool rest is rotatably mounted at the first end through a mounting shaft and used for mounting a tool; the drive mechanism is fixedly connected with the second end to support the cantilever and is used for driving the tool rest to rotate. Compared with the prior art, the surface processing equipment has the advantages that the cantilever which can extend into a deep cavity is arranged between the drive mechanism and the tool rest, so that the processing equipment can directly process the inner surface of the deep cavity; a work piece to be processed need not be segmented, a connecting process is avoided, simple processing process is achieved, and the processed inner surface is high in quality; the cantilever is of the cuboid shape with the hollow inner cavity, so that the stability of the cantilever is enhanced, the cantilever is less prone to shaking during the inner surface processing of the deep cavity, and the inner surface processing quality can be further improved.

The invention discloses a pipe pulling and drawing lubricating device, and further discloses a pipe pulling and drawing machining method. The pipe pulling and drawing lubricating device comprises an oil supplying mechanism arranged on a chain broaching machine and a lubricating pipe connected with the oil supplying mechanism. The oil supplying mechanism comprises an oil box for storing lubricatingoil, an oil injecting pipe connected with the lubricating pipe and an oil injecting pump connected to the position between the oil box and the oil injecting pipe. The lubricating pipe is composed ofa flat and straight steel pipe, a sealing plate arranged at one end of the flat and straight steel pipe and a connecting rod mounted on the end face of the sealing plate and used for being connected with a pulling and drawing core head. The flat and straight steel pipe is composed of an oil injecting section, a clamping section and a connecting section. The pipe pulling and drawing machining method comprises the steps of 1, preparation of a to-be-pulled-drawn pipe blank, 2, mounting of a pulling and drawing external mold and the to-be-pulled-drawn pipe blank, 3, mounting of the lubricating device and the pulling and drawing core head, and 4, lubricating and pulling-drawing of the to-be-pulled-drawn pipe blank. According to the pipe pulling and drawing lubricating device, the purpose that the lubricating oil is continuously injected into the pipe blank can be achieved, the phenomena that adding of the lubricating oil is uneven, and the local lubricating oil of the inner wall of a pipe is absent cannot occur, and the quality of the inner surface of the pipe after being pulled and drawn is improved.

The invention relates to an omnidirectional multi-functional disk type elongating mill, the diameters of an upper and a lower guide disk are increased; the lifting of the upper guide disk adopts a turbine, a worm and a leading screw device; the lifting of the lower guide disk adopts a standard spiral elevator; and the axial direction adjustment is realized by the standard spiral elevator; the positive direction location, lateral direction location and upper and lower direction location are realized by a hydraulic cylinder. The axial direction adjustment of the roller is realized by the standard spiral elevator; the radial direction is adjusted by the combination of a non-standard spiral elevator and the hydraulic cylinder; the locking device adopts the hydraulic cylinder and an adjusting wedge mechanism. Guide bushes of an outlet and an inlet port adopt the upper-pressing and lower-locking of the hydraulic cylinder. The reliability is increased by adopting the hydraulic system; the enlarged diameters of guide disks can improve the locking condition of the roller, the elongation coefficient is increased, screw threads in the steel tube are reduced after rolling, and the variety of products is enlarged; gaps of the axial direction and radial direction of the guide disks and the roller are reduced, and the stability of the rolling is strengthened; the structure of the side pressure oil cylinder of the roller is simple, and the running is reliable; the guide bushes of the outlet and inlet port adopt the upper-pressing and lower-locking device to realize the double-assurance.