34results about How to "Low roundness" patented technology

The invention discloses a polylactic acid toughened material for 3D printing, which comprises polylactic acid and the following components in percentage by mass (on the basis of polylactic acid): 5-25% of toughener, 0.5-2.0% of lubricant, 0.5-2.0% of oxidized polyethylene wax, 0.3-1.0% of white oil, 5-25% of low-melting-point resin-coated inorganic powder and 0.3-0.9% of antioxidant. The material prepared by the technical scheme has the advantages of favorable toughness, high extrusion forming regularity and favorable line roundness. The printing proves that the product has the advantages of low shrinkage, no edge lifting, no cracking, high cooling speed and favorable appearance and has wide printing application range.

The invention discloses an extensible and retractable inner supporting tool. One end of a left-handed screw is installed in a screw installation hole in the plane geometric center of a supporting plate, and the left-handed screw is in rotating fit with the screw installation hole. A left-hand thread at the other end of the left-handed screw is installed in a threaded hole in the center at one endof a sleeve. One end of a right-handed screw is installed in a screw installation hole in the plane geometric center of the other supporting plate, and the right-handed screw is in rotating fit with the screw installation hole. A right-hand thread at the other end of the right-handed screw is loaded in a threaded hole in the center at the other end of the sleeve. The extensible and retractable inner supporting tool has extending and retracting functions; in a shortened state, the extensible and retractable inner supporting tool can be put into a shell and then extends to support a cylinder, rigid restraining to the cylinder is achieved, and the welding deformation is reduced; and by means of stress relief annealing heat treatment through the belt tool, deformation stress is eliminated, andtherefore the cylinder circular degree after welding is guaranteed, and the circular degree of the shell is reduced to 2.5 mm from 10 mm.

A carbon containing masking layer is patterned to include a plurality of container openings therein having minimum feature dimensions of less than or equal to 0.20 micron. The container openings respectively have at least three peripheral corner areas which are each rounded. The container forming layer is plasma etched through the masking layer openings. In one implementation, such plasma etching uses conditions effective to both a) etch the masking layer to modify shape of the masking layer openings by at least reducing degree of roundness of the at least three corners in the masking layer, and b) form container openings in the container forming layer of the modified shapes. Capacitors comprising container shapes are formed using the container openings in the container forming layer. Other implementations and aspects are disclosed.

A slow-releasing kurarinol micropill is composed of a pill core containing kurarinol (20-90%) and prepared by rounding method, and a coated slow-release film prepared by fluidized-bed coating method.

The invention relates to a tool and method for correcting the shape of a composite cabin section and belongs to the technical field of composite component curing deformation. In the method, the shape of the composite cabin section is corrected by using the tool at set temperature so as to reduce the problems that the deformation of a composite component causes product scrap, or too-concentrated stress on the following processing and assembly and the like.

The invention discloses a grinding and removing device for a spigot of an adjustable galvanized plate end cover. The grinding and removing device comprises a base, clamping devices, an inner gear disc, a rotating motor and a grinding device, wherein the clamping devices are arranged on the left side and the right side of the inside of a lifting table, the inner gear disc is fixedly welded to the lower side of a sliding strip through a connecting rod, a connecting shaft is arranged at the center wheel core of a second gear in an interference fit mode, and a grinding device is arranged at the lower end of the connecting shaft. According to the grinding device, the end covers with different diameters can be clamped, so that the universality of the device is greatly improved, and the purchasing cost of equipment is saved; a grinding head on the grinding device is driven to carry out planetary rotation, and the spigot in the end cover is ground, so that compared with manual grinding, the grinding speed of the grinding and removing device is higher; the intensity of grinding each spigot can be the same, the degree of roundness of the end cover caused by different grinding strength is avoided, and the single-machine noise of a motor during final assembly is guaranteed.

Provided is a large-diameter tube assembling and lifting tool. The large-diameter tube assembling and lifting tool comprises two arc-shaped inclasping pieces and two lifting pieces used for connecting the at least two arc-shaped inclasping pieces. The arc radiuses of the arc-shaped inclasping pieces are equal to the radius of a tube. The two lifting pieces are arranged on the extension line of the diameter of the tube, and a lifting hole is formed in each lifting piece. The lifting holes are used for connecting a lifting rope in a penetrating mode. Due to the fact that a circular ring is used to lift the large-diameter tube, gravity stressed by the large-diameter tube assembling and lifting tool can be evenly distributed on the circular ring, and therefore pressure on each portion of the tube is roughly equal. Thus, the phenomenon that circular degrees of the tube are reduced caused by uneven stress in the process of lifting can be avoided.

The invention provides a tire assembly drum, capable of suppressing the abrasion between side ends of a combination die. The tire assembly drum comprises a first and a second combination die which are assembled alternately in a circumferential direction and can move between a shrinking state and an expanding state by aid of an expanding unit. The expanding unit comprises a cone-shaped sliding body which is capable of being guided to move in an axis direction and is provided with a guiding face at the inner end in the axis direction, a first and a second moving piece which are capable of being guided to move in and out in a radial direction and are provided with a first and a second combination die at the outer end in the radial direction. The guiding face consists of a first oblique face connected to a first moving piece in a snap-fit, a second oblique face which inclines differently from the first oblique face and is connected to a second moving piece in a snap-fit. At the time of expanding, the first combination die reaches to the expanding position earlier than the second combination die. At the time of shrinking, the first combination die moves from the expanding position towards the inner side in a radial direction later than the second combination die.

The invention discloses a titanium concentrate grinding aid, which is characterized by comprising the following steps: adding 25-30% of glycerol by mass ratio in a reaction container, adding 50-60% triethanolamine by mass ratio, adding about 15% of mixture of neutralized formic acid and sodium dodecanesulphonate, then mixing and stirring, wherein the stirring speed is 400-500rotation/minute and the stirring time is 1.5-2 hours, and obtaining the titanium concentrate grinding aid. The mass ratio of glycerol to triethanolamine to neutralized formic acid to sodium dodecanesulphonate is 4: 8: 1: 1. Addition of the grinding aid can solve the problem of electrostatic interaction generated during the grinding process of titanium concentrate, so that good grinding effect is reached, and power consumption is saved.

The invention discloses a casting system and casting method of a cylinder barrel. The casting system comprise a casting mold cavity and a pouring system, wherein the casting cavity comprises a cylinder barrel cavity body, a through hole is axially formed in the cylinder barrel cavity body, the cylinder barrel cavity body is composed of a cylinder barrel head part and a middle body part, the diameter of the cylinder barrel head part is larger than that of the middle body part, a radial protruding block is arranged on the cylinder barrel head part, and a supporting fixing hole and an oil passagehole are formed in the protruding block; the pouring system comprises a sprue, a transverse runner and an inner sprue, the sprue vertically communicates with the transverse runner, the two ends of the transverse runner communicate with the inner sprue through risers, and the inner sprue communicates with a convex block of the casting cavity; and the supporting fixing hole is filled with a first sand core, and an axial through hole of the cylinder barrel cavity body is filled with a second sand core. The casting system has the advantages that parts with the wall thickness of a casting are notprone to shrinkage and loosening defect generating, particularly, the casting defect is not easy to occur among the supporting fixing hole, the oil passage hole and the inner surface of the cylinder barrel, and a chill structure cannot be easily generated in parts with the thin wall thickness.

The invention discloses a feed for artificial culturing of leiocassis longirostris. Raw materials of the feed comprise, in parts by weight, 18-26 parts of millet, 5-10 parts of cicada pupa powder, 2-8 parts of kelp powder, 1-5 parts of mulberry leaf powder, 30-40 parts of an adhesive, 1-5 parts of baikal skullcap roots, 1-2 parts of dandelion herbs, 1-2 parts of immature flower of Japanese honeysuckle, 0.5-1.2 parts of coptis roots, 0.15-0.35 part of EM bacteria, 0.2-0.6 part of lecithin, 0.1-0.3 part of beta-carotene, and 0.5-1 part of a phagostimulant. The feed for artificial culturing of the leiocassis longirostris provided by the invention can obviously raise the surviving rate of the leiocassis longirostris, improve economic benefits of the artificial culturing, and significantly decrease the generation of bacterium infection and diseases such as fatty liver in a culturing process. The feed improves the quality of the leiocassis longirostris, and contains no antibiotic.

The invention relates to a high precision cotton spinning ring which uses low hardness steels as a base and process for preparation, wherein the steels whose rockwell hardness is equal or lesser than 65 is minutely processed into the ring base according to a needed shape of a ring, a high hardness wear resistant layer is coated on the ring base, the thickness D of the high hardness wear resistant layer is equal or greater than 1micron and is equal or lesser than 30 micron. The process for preparation is that the steels are orderly processed into ring blank through blanking, then the ring blank is processed into the ring base whose spherical degree is lower than 40 micron and smoothness is lower than 10 micron through rough turning and finish turning, and then a product is obtained through the surface hardening wear-resistant treatment of the ring base. The invention overcomes technology bias, both is capable of observably improving the precision of the cotton spinning ring, and meets the requirements of high hardness wear resistance lubrication of the surface of the cotton spinning ring. The process for preparation not only has simple process and very easiest operation, but also observably reduces the manufacturing cost, and prolongs the service life of the cotton spinning ring.

The invention belongs to the technical field of spinning forming, and relates to a method for reducing deformation residual stress of a straight cylinder part in a powerful spinning process, which comprises the following specific steps of: firstly selecting a blank material meeting processing requirements, then carving spiral dents at different intervals on the inner wall of the blank material by combining a spinning thinning rate and a pass ratio, and finally forming the spiral dents on the inner wall of the blank material. The straightness deviation of the spinning straight cylinder part is controlled within 0.2 mm, the roundness deviation is controlled within 0.03 mm, and the subsequent machining efficiency is improved by more than 50%; the hardness value of a spinning forming workpiece is reduced by about 15%, high-quality spinning can be achieved, meanwhile, the residual stress in the spinning forming workpiece is reduced, and the use performance is improved.

The invention discloses a fixed shaft type outer rotor brushless motor, comprising a permanent magnet rotor, a winding stator, a fixed shaft and a shell. The fixed shaft is fixedly arranged. The winding stator is fixed to the fixed shaft. A bearing is arranged between the fixed shaft and the shell. The permanent magnet rotor is fixed to the inner wall of the shell, and surrounds the winding stator. The permanent magnet rotor drives the shell to rotate when rotating. By using the fixed shaft type outer rotor brushless motor, the requirement on the roundness, smoothness and concentricity of themotor output shaft can be reduced. Moreover, the fixed shaft type outer rotor brushless motor is of high reliability and lower cost.

The invention discloses a feed for improving leiocassis longirostris flavor, which is prepared from, by weight, 4-8 parts of guar gum sodium carboxymethylcellulose composite, 40-50 parts of high gluten flour, 16-20 parts of maltose, 4-8 parts of bacteriostat system, 1-3 parts of hawthorn, 2-4 parts of Amomum tsao-ko, 30-50 parts of germinated brown rice powder, 16-22 parts of earthworm powder, 10-16 parts of seaweed meal, 4-8 parts of pine needle meal, and 3-3.6 parts of intestinal tract promoter. The feed has advantages of improving immunity and survival rate of leiocassis longirostris, obviously improving the survival rate, increasing economic benefit of artificial cultivation, effectively inhibiting lipoxidase activity, reducing generation of aldehydes material, and greatly decreasing stink odor of leiocassis longirostris; meanwhile, the leiocassis longirostris excrement is few and water body is not polluted.