33results about How to "Reduced machinability" patented technology

One aspect of the invention relates to a process for the preparation of polymers P having amide groups and ester groups, wherein, in a first step, a homopolymer or copolymer P1 of (meth)acrylic acid is mixed with a monohydroxy compound E at a temperature of up to 200 °C, resulting in the formation of anhydride groups in addition to ester groups. In the second step, the anhydride groups formed in the first step are reacted with monoamine compound A at a temperature significantly lower than 100 °C. Another aspect of the invention relates to the polymer obtained according to the process, the use of the polymer in a hydraulic composition, and the hydraulic composition before and after hardening by water.

The invention discloses a high-difficulty steel core wire electrode and a manufacturing method thereof. The high-difficulty steel core wire electrode comprises a core material, a middle clad layer and an outer clad layer. The core material is prepared from raw materials including, by weight, 30-54 parts of iron, 30-55 parts of carbon, 1.5-2.4 parts of tin, 4-9 parts of chromium, 1-3 parts of manganese, 2-5 parts of molybdenum, 1.3-5.1 parts of nickel, 2.3-5.4 parts of silicon, 3-6 parts of tungsten, 3-4 parts of vanadium, 2-6 parts of phosphorus, 5-10 parts of sulphur and 12-15 parts of heat conducting filler. The steel core wire electrode is a composite wire and is composed of the steel core, the middle red copper clad layer and the outer brass clad layer. At the normal temperature, the steel core and a brass wire almost have the same tensile strength, but with the increase of temperature, the tensile strength of the brass wire is rapidly reduced, and the tensile strength of the steel is higher than that of the brass wire. The red copper layer is wrapped outside the steel core to improve the electric conductivity, and the outer brass layer plays a role in improving the washing performance.

The invention discloses a heat treatment method of steel. The heat treatment method of the steel comprises the following steps of (1) annealing, specifically, after a steel part is heated to enable the temperature to be Ac3+30-50 DEG C or Ac1+30-50 DEG C or below Ac1, the steel part is slowly cooled along with the furnace temperature; (2) normalization; (3) quenching; (4) tempering, specifically,the quenched steel part is heated again to enable the temperature to be below Ac1, and the steel part is cooled in the air or oil or hot water or water after heat preservation is accomplished; (5) hardening and tempering; (6) aging, specifically, the steel part is heated to enable the temperature to range from 80 DEG C to 200 DEG C, the heat preservation is conducted for 5-20 hours, and the steelpart is taken out and cooled in the air along with a furnace; (7) cold treatment; (8) flame heating surface quenching; (9) induction heating surface quenching; (10) carburization; (11) nitridation; and (12) nitrocarburizing. The hardness, the wear resistance, the fatigue strength and the corrosion resistance of the surface of the steel part are improved, the cutting machining performance is improved, and the smoothness of the machined surface is improved. The deformation and cracks formed in the quenching process are reduced, and the good comprehensive mechanical properties are obtained.

The invention discloses a gas-liquid separator. The gas-liquid separator is used for a refrigerating system. The gas-liquid separator comprises a cylinder, an inlet pipe fixedly connected with the upper end of the cylinder and an outlet pipe fixedly connected with the lower end of the cylinder and further comprises a gas guide element; the gas guide element further comprises a baffle, a folding side located at one end of the baffle and a bottom plate located at the other end of the baffle; the baffle is located above the outlet pipe and shields a gas inlet of the outlet pipe, the folding side is fixedly connected with the inner wall of the cylinder, and the bottom plate is fixedly connected with the side wall of the gas inlet end of the outlet pipe. The gas guide element is formed by machining of a steel plate, the machining technology is simple, liquid can be effectively prevented from entering the outlet pipe, liquid hammer to a compressor is avoided, and the separator can replace a positioning device to a play a role in fixing the outlet pipe.

The invention relates to free-cutting corrosion-resistant steel and a preparation method thereof. The free-cutting corrosion-resistant steel comprises the following components in percentage by mass: 0.015 to 0.024 percent of C; 0.4 to 0.5 percent of Si; 1.2 to 1.3 percent of Mn; 0.24 to 0.3 percent of S; 0.02 to 0.03 percent of P; 1.5 to 1.75 percent of Mo; 19 to 20 percent of Cr; 0.03 to 0.08 percent of Ca; 0.01 to 0.02 percent of Mg; 0.02 to 0.05 percent of Al; 0.012 to 0.03 percent of Te; and the balance Fe and impurities. The method comprises the following steps of uniformly mixing free-cutting steel, a ferrochrome mixture and slag charge, and completely melting at high temperature to obtain a melt; and adding tellurium into the melt, conducting heat preservation treatment, and cooling to obtain the free-cutting corrosion-resistant steel. The free-cutting corrosion-resistant steel disclosed by the invention has the optimal component proportion, and has the comprehensive optimal free-cutting performance and corrosion resistance.

The invention discloses a hole machining tool with an independent drill tip in the center. The hole machining tool comprises a tool body and the drill tip. The drill tip comprises an inner drill tip body and an outer drill tip body independent of each other. The outer drill tip body is arranged on the tool body. The inner drill tip body is mounted in the center of the outer drill tip body to forma core of the outer drill tip body. The cutting depth of the inner drill tip body is larger than that of the outer drill tip body. The drill tip is composed of the inner drill tip body and the outer drill tip body, the inner drill tip body is cut into a workpiece successively in a layered manner in the cutting depth direction, after the inner drill tip body is cut into the workpiece stably, the outer drill tip body is cut into the workpiece, the time that the drill tip is cut into the workpiece is prolonged, and the stability that the drill tip is drilled in the workpiece is greatly improved;due to the fact that the inner drill tip body is independent relative to the outer drill tip body, the inner drill tip body can have a small drill tip vertex angle, the outer drill tip body can have alarge drill tip vertex angle, the situation that the tool cut-in process is too fast and consequently a cutting edge is excessively extruded by cutting scraps can be avoided by means of the small drill tip vertex angle of the inner drill tip body, and stability generated when the drill tip is cut into the workpiece is improved; and the inner drill tip body can be mounted on the outer drill tip body in a batched interchanging manner and a flexible combination manner, and the inventory of the hole drilling tool is greatly reduced.

The invention discloses an optical system, a camera module and electronic equipment. The optical system includes: a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof; the object-side surface and the image-side surface of the second lens are respectively a convex surface and a concave surface near the circumference, the object-side surface of the third lens is a convex surface near the optical axis, and the image-side surface of the third lens is a concave surface near the circumference; the fourth lens, the fifth lens, the sixth lens and the seventh lens have refractive power; the object side surface of the fifth lens is a concave surface near the circumference; the sixth lens element has an object-side surface being concave in a paraxial region thereof. The object side surface and the image side surface of the seventh lens are respectively a concave surface and a convex surface near the circumference; the optical system satisfies the relationship 0.242 mm <-1 > < (TTL/ImgH)/f < 0.261 mm <-1 >. According to the optical system provided by the embodiment of the invention, good imaging quality can be considered while miniaturization design is realized.

The invention discloses a hole-machining tool with an independent drill tip in center. The hole-machining tool with the independent drill tip in center comprises a tool body and the drill tip, the drill tip comprises an inner drill tip and an outer drill tip which are independent from each other, the outer drill tip is arranged on the tool body, the inner drill tip is arranged at the center of theouter drill tip in a penetrating mode and is arranged on the tool body, and the cutting depth of the inner drill tip is larger than the cutting depth of the outer drill tip. The drill tip is composedof the inner drill tip and the outer drill tip, the inner drill tip and the outer drill tip sequentially cut into a workpiece in a layered mode along the cutting depth direction, the inner drill tipcuts into the workpiece stably and then the outer drill tip cuts into the workpiece, so that the time for the drill tip to cut into the workpiece is prolonged and the stability of the drill tip duringdrilling into the workpiece is greatly improved; due to the fact that the inner drill tip is independent from the outer drill tip, the inner drill tip is provided with a small drill tip angle, the outer drill tip is provided with a large drill tip angle, the tool can be prevented from drilling excessively fast in the cut-in process, so that excessive extrusion to cutting edges by cut chips can beprevented, and the stability of the tool during cutting into the workpiece is improved; and the inner drill tips can be interchanged in batches, flexibly combined and installed on the outer drill tip, so that the inventory of hole drilling tools is greatly reduced.

Fibers of diverse materials find widespread use in inorganic binder compositions to improve the properties of the final cured composite materials. When using high amounts of fiber in inorganic binderslurries, problems arise due to the loss of workability because of unevenly distributed fiber content. The fibers according to the invention allow the use of large amounts of fiber without loss of workability and are particularily useful to control the rheology of the composite slurry mixtures. The fibers according to the invention are bicomponent fibers comprising a first hydrophobic polymer anda second hydrophilic polymer, and are obtained by: - uniaxially stretching a sheet of a first polymer; - oxidizing one side of a sheet of said first polymer; - coating the oxidized side of a sheet ofsaid first polymer with said second polymer; - drying the resulting bicomponent substrate; - cutting the dried bicomponent substrate into fibers of desired dimensions.

The invention provides a production method for manufacturing a vehicle-mounted concrete tank, and relates to the technical field of metallurgy manufacturing. Raw materials include, by mass percent, 0.15%-0.18% of C, 0.10%-0.20% of Si, 3.35%-4.50% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.010% of S, 0.20%-0.40% of Cu and the like. The method comprises the following machining steps including the slab heating procedure, the high-pressure descaling procedure, the controlled rolling procedure and the curling procedure. According to the provided production method for manufacturing the vehicle-mounted concrete tank, the high manganese content is adopted, so that a matrix structure of a produced steel plate contains a large amount of metastable state austenite, and the characteristics that plasticity is good, and machining forming is easy are achieved. After the surface of the steel plate is subjected to impacts, the surface austenite can be converted into a hardmartensitic structure, accordingly, very high hardness and abrasion resisting performance are achieved, the steel plate is suitable for the later usage environment in which continuous friction with concrete exists, and the service life is prolonged.

The invention relates to a chromium-iron-aluminum alloy with the surface rich in aluminum. Raw materials of the iron-chromium-aluminum alloy are ingot iron, chromium metal and aluminum nitride powder.In the preparation process of the iron-chromium-aluminum alloy, after the ingot iron, the chromium metal and 1/3 of aluminum nitride powder are subjected to primary smelting in a medium-frequency induction furnace, slag is removed; 1/3 of aluminum nitride powder is secondarily added into molten steel obtained after slag removal for secondary smelting; after smelting, an iron-chromium-aluminum alloy ingot is obtained through casting; the iron-chromium-aluminum alloy ingot is buried in the remaining 1/3 of aluminum nitride powder to be placed into a vacuum induction furnace for ternary smelting; the temperature is controlled to range from 2,100 DEG C to 2,300 DEG C, and the smelting time is controlled to range from 30 min to 50 min; and then fast cooling is carried out till the temperatureranges from 1,000 DEG C to 1,100 DEG C, constant-temperature sintering is carried out for 30 min to 50 min at the temperature, and the iron-chromium-aluminum alloy with the surface rich in aluminum isobtained after cooling. The quick life value of a wire made of an iron-chromium-aluminum alloy material high in aluminum content ranges from 150 h to 200 h at the temperature being 1,300 DEG C, the service life is long, and application of the iron-chromium-aluminum alloy can meet the requirements of special industries.

The invention provides a dental root canal treatment instrument, which can improve the flexibility, the machinability and/or the fracture resistance of the dental root canal treatment instrument. In a dental root canal treatment instrument (100), the cross-sectional shape at a first longitudinal direction position on the tip side is configured from an arcuate part (111) and first linear parts (112), and the number of linear parts constituting the cross-sectional shape closer to the base end side than the tip side is formed so as to increase.