33results about How to "Reduce the roughness of the machined surface" patented technology

The invention relates to a laser cutting device and a laser head thereof. The laser head comprises an air inlet ring, a first rectifier tube, a second rectifier tube and an air nozzle. An annular groove is formed in the inner side of the air inlet ring, and air inlet holes communicated to the groove are formed in the outer side of the air inlet ring; ventilation holes are formed in the side wall of the first rectifier tube, the first rectifier tube is sleeved with the air inlet ring, and the ventilation holes are communicated with the groove; an air flow passage is formed inside the second rectifier tube, and the second rectifier tube comprises a first end and a second end which are opposite; the second rectifier tube is sleeved with the first rectifier tube, and a rectifying passage is formed between the first rectifier tube and the second rectifier tube; and an air outlet gap is formed between the first rectifier tube and the first end, and the air flow passage and the rectifying passage are communicated through the air outlet gap. Due to two times of rectifying, the airflow distribution evenness of cutting air can be improved, and the intensity of turbulence can be reduced, so that the influence of the pneumatic optical effect on a laser path is reduced, the stability of the quality of laser beams is guaranteed, the roughness of the machined surface is reduced, and the perpendicularity of cut lines is improved.

A low-carbon sulfur free-cutting steel containing C: more than 0.02% and less than 0.20%; Si: more than 0.10% and less than 1.5%; Mn: 0.8-2.2%; P: 0.005-0.25%; S: more than 0.40% , less than 0.8%; O: <0.010%; N≤0.025%; Ca: 0.0003~0.005%, the balance is composed of Fe and impurities, among which Al<0.005%, Mg<0.0003%, Ti≤0.002%, Zr ≤0.002%, REM<0.0003%, satisfying "2.0<Mn / S<4.0" and "0.0005≤10Ca×Si≤0.050", compared with the existing Pb-free Low-carbon free-cutting steel has a smaller surface roughness than low-carbon free-cutting steel, and is also excellent in chip disposability. The low carbon sulfur free cutting steel may also contain one or more of Te≤0.05%, Bi≤0.15%, Sn≤0.5%, and / or Cr≤2.0%, Mo≤0.5%, V≤0.3%, Nb≤ One or more of 0.3%.

The invention relates to an electrolytic machining method and device for the nozzle hole of a fuel injector of a diesel engine, which comprises the following steps: 1) pre-processing a cylindrical or forward tapered through hole on the workpiece of the fuel injector; The nozzle workpiece is set in an electrolyte circulation device, a tool electrode is clamped on an electrode feeding mechanism, the positive pole of an electrolytic machining power supply is connected to the nozzle workpiece, the negative pole is connected to the tool electrode, and the The electrolytic processing power supply, the electrode feeding mechanism and the liquid pump of the electrolyte circulation device are connected to an industrial computer through the drive circuit; 3) Start the liquid pump to inject the electrolyte into the through hole of the nozzle workpiece, and the electrolyte flows back from the liquid tank to the electrolysis 4) Turn on the electrolytic machining power supply, and the industrial computer controls the electrode feeding mechanism to drive the tool electrode to make a feeding movement, and at the same time controls the electrical signal parameters of the power supply, and performs electrolytic machining on the through hole until the through hole is completely closed. Processed into an inverted tapered nozzle hole with a circular arc transition zone; 5) Turn off the electrolytic machining power supply and liquid pump, and reset the tool electrode. The invention can be widely used in the processing of spray holes with various shapes.

The invention discloses a cutting fluid and a preparation method thereof. The preparation method comprises the steps of mixing trimethylolpropane fatty acid ester, ternary polycarboxylate, sebacic acid, triethanolamine, guerbet alcohol, ethylene oxide cyclohexylamine and benzotriazole at the ratio, adding to water, stirring evenly, heating, reacting for a certain period of time to form a transparent solution and a solid without particles and preparing a water-soluble cutting fluid complex agent; and adding fatty alcohol-polyoxyethylene ether and starcide BK into the water-soluble cutting fluid complex agent, stirring at a uniform sped at room temperature for a certain period of time until the solution is transparent, adding graphene oxide, further stirring at a uniform sped at the room temperature till the solution is semitransparent, thus obtaining the cutting fluid containing the graphene oxide. The cutting fluid is green, environment-friendly and pollution-free in components and good in lubricating property.

The invention relates to a neodymium compound containing soft grinding material fixing grinding tool for polishing a sapphire wafer. Preparation raw materials of the neodymium compound containing softgrinding material fixing grinding tool comprise, by mass percent, 40%-60% of nanosilicon dioxide, 20%-40% of a binder, 10%-15% of a curing agent, 5%-10% of a neodymium compound and the balance deionized water. The invention provides a manufacturing method of the neodymium compound containing soft grinding material fixing grinding tool for polishing the sapphire wafer. The curing agent is added into the deionized water and is stirred to be dissolved, and then the binder, nanosilicon dioxide, the neodymium compound and the like are added and stirred uniformly; and the prepared materials are subjected to hot press forming in a mold, after demolding, thermocuring is completed, the upper end face and the lower end face are subjected to finishing, the flatness and parallelism of the upper end face and the lower end face of the grinding tool are guaranteed, and the neodymium compound containing soft grinding material fixing grinding tool is obtained. The removal rate of the sapphire wafer can be improved, roughness can be reduced, the processing efficiency can be improved, and the production cost can be reduced.

The invention relates to a quenched steel test piece, a process detecting method, a design method and a vehicle door milling method. A process design method for milling a multi-hardness spliced quenched steel mold with high speed solves the problem of process design collision caused by coorelation of multiple evaluation indexes in the prior art through a method of using a test piece for detecting and comprehensively evaluating. The detecting method uses the surface curvature of the test piece and the hardness change feature to detect a milling cutter, and solves the problem of difficult guarantee of the product surface quality. The test piece has the characteristics of multi-curvature change and multi-hardness part combination, and reduces the problem of damage of a mold profile caused by damage of the milling cutter. Through the difference between the rotating speed and the feeding speed, the vehicle door concave mold milling method shortens the machining time, reduces the cutter number, reduces the machined surface roughness, and improves the machining precision.

The invention discloses a turning processing method of silicon carbide whisker-reinforced aluminum-based composite materials, and relates to a turning processing method of composite materials. The invention adopts a single crystal diamond turning tool or a polycrystalline diamond blade. Before turning, the corresponding diamond blade is assembled on the On matching tool holders; turning silicon carbide whisker reinforced aluminum matrix composites under the action of lubricating fluid and coolant. The invention uses kerosene as lubricating and cooling fluid to reduce the formation of scales and reduce the roughness of the machined surface. Through the combination of specific parameters, the cutting residual stress is reduced and the service performance of components is improved.

The invention discloses a bismuth-containing free-cutting pre-hardened plastic mold steel and a preparation method thereof. The chemical composition of the mold steel is as follows according to mass percentage: C: 0.32-0.40%, Si: 0.15-0.30%, Mn: 1.50-1.70 %, Cr: 1.70~2.00%, Ni: 0.85~1.15%, Mo: 0.25~0.40%, P≤0.015%, S≤0.005%, V: 0.05~0.10%, Bi: 0.05~0.15%, and the balance is Fe; its preparation method includes: smelting and casting into ingots according to the set chemical composition, forging the ingots into forging billets after high-temperature homogenization treatment, performing offline normalizing treatment to refine grains after forging, and finally undergoing quenching and tempering heat treatment, A uniform structure with a hardness of 32-48HRC is obtained. The bismuth-containing easy-cutting pre-hardened plastic mold steel of the present invention, through reasonable chemical composition design, adds bismuth element to replace the traditional easy-cutting elements sulfur and lead. It solves the thermal embrittlement phenomenon and the anisotropy caused by sulfur, and at the same time solves the problem that lead is harmful to the human body and pollutes the environment.