15results about How to "Excellent machinability" patented technology

The invention relates to the field of metal material casting, and discloses a production method of green sand as-cast high-plasticity nodular cast iron QT800-5, which comprises the following steps: preparing pig iron, waste steel and foundry returns, and using auxiliary materials such as a silicon carbide pretreating agent, a high-temperature graphitization carburant, a rare earth magnesium silicon iron nodulizing agent, a silicon barium nucleating agent and a silicon strontium nucleating agent to prepare the green sand as-cast high-plasticity nodular cast iron QT800-5. The purity and component stability of molten iron are ensured; in the smelting process, purification and adjustment are carried out through temperature control and segmented addition of auxiliary materials, then spheroidizing is carried out through a pouring method, and the microscopic structure of a casting is optimized through ladle-to-ladle inoculation and stream inoculation; the final casting has excellent mechanical properties including the tensile strength larger than or equal to 800 MPa, the yield strength larger than or equal to 480 MPa, the elongation larger than or equal to 5% and the matrix pearlite content larger than or equal to 80%. The production process disclosed by the invention is simplified, is suitable for large-scale industrial production, and has a wide application prospect in lightweight application requiring high-strength and high-plasticity materials.

The invention discloses a high-uniform high-mirror-polishing performance mold steel and a preparation method thereof, which belongs to the technical field of tool and die steel, and solves the problems of serious carbide segregation and poor organizational uniformity in the prior art plastic mold steel. The components of the high-uniform high-mirror-polishing performance mold steel include, by mass percentage: C: 0.10% to 0.30%, Si: ≤1%, Mn: ≤1%, Cr: 10.0% to 14.0%, Ni: 0.2% to 2.0%, Mo: 0.5% to 1.0%, V: 0.005% to 1.00%, N: 0.15% to 0.50%, and the remainder is Fe and unavoidable impurities. The high-uniform high-mirror-polishing performance mold steel of the invention has good uniformity, excellent cutting performance, and excellent corrosion resistance.

The utility model discloses a lead-free environment-friendly copper alloy bar for a valve, which comprises a lead-free copper alloy bar body, a hollow hole is arranged at the center of the lead-free copper alloy bar body, a plurality of inclined planes are arranged on the surface of the lead-free copper alloy bar body at equal intervals, an anti-corrosion paint layer is arranged on the surface of the lead-free copper alloy bar body, and the anti-corrosion paint layer is arranged on the surface of the lead-free copper alloy bar body. The lead-free copper alloy bar has the advantages that through the arrangement of the hollow holes, the weight of the lead-free copper alloy bar body is reduced, meanwhile, enough strength is kept, meanwhile, resistance and thermal resistance are reduced, and the electric conduction efficiency and the heat conduction efficiency are improved; the copper alloy material is low in cost, low in cost and free of lead and chromium, meets international environmental protection standards, reduces potential hazards to the environment and human bodies, keeps high strength, high toughness and good machinability of a traditional copper alloy, and is suitable for manufacturing various valve parts.

The invention belongs to the related field of ultra-precision machining technology, and discloses an ultrasonic free track vibration cutting device for efficiently manufacturing a complex microstructure of a difficult-to-machine material, which comprises a signal generator, a power amplifier and an ultrasonic vibration cutting unit, wherein the signal generator is used for outputting three paths of independent initial driving signals of low-frequency bending vibration, low-frequency longitudinal vibration and high-frequency longitudinal vibration; the power amplifier is used for performing gain amplification on the three paths of electric signals and then inputting the electric signals into the ultrasonic vibration cutting unit; the ultrasonic vibration cutting unit is used for generating bending vibration in the cutting direction and longitudinal vibration after superposition in the cutting depth direction and correspondingly driving a tool to achieve cutting machining in a free track. According to the invention, a single bending vibration mode and a plurality of longitudinal vibration modes can be coupled, so that the vibration track is changed from a single elliptical track to any controllable complex curved surface track, and the method is particularly suitable for manufacturing the surface of a functional microstructure of a material difficult to machine.

The present invention provides a crescent-shaped cutting edge cemented carbide milling cutter and a parameter design method thereof, and relates to the technical field of milling cutter design. The milling cutter of the present invention comprises a front cutter head, a peripheral blade portion and a shank portion, and the peripheral blade portion is provided with a plurality of crescent-shaped peripheral blades spirally extending toward the front cutter head, the front cutter head is provided with a plurality of crescent-shaped cutting edges, and the crescent-shaped cutting edges and the crescent-shaped peripheral blades are transitioned by circular arcs in pairs. The present invention ensures that the milling cutter has relatively excellent cutting performance through the arrangement of the crescent-shaped cutting edges and the crescent-shaped peripheral blades, and the arrangement of the circular arc transition between the crescent-shaped cutting edges and the crescent-shaped peripheral blades ensures the smoothness of the milling cutter when cutting metal workpieces.

The invention relates to the field of valve bodies, in particular to a machining process of a stop valve body, which comprises the following steps: annealing, stably putting the valve body into an annealing furnace, setting the temperature of the annealing furnace at 680-750 DEG C, keeping for 1-2 hours to ensure that the temperature is uniform, slowly cooling in the furnace or slowly cooling in slag outside the furnace, taking out the valve body after cooling, and detecting the quality of the valve body. The valve body is placed in a heating furnace, the valve body is heated to 850-950 DEG C, heated to the critical temperature interval of steel and heated to the target temperature, the temperature is kept for 15-30 min, then the valve body is taken out of the furnace and naturally cooled to the room temperature, the internal stress of the material is eliminated through annealing, and the material is prevented from deforming or cracking in subsequent machining; and the annealed material has good plasticity and toughness, subsequent secondary machining is facilitated, the strength and hardness of the material can be remarkably improved through normalizing, the mechanical performance of the material is improved, the strength and hardness of the obtained material are higher, and the normalized valve body material is more uniform in grain and more refined in structure.

The invention belongs to the technical field of valve rod guide sleeve fixing device manufacturing, and particularly relates to an auxiliary mounting device for valve rod guide sleeve inner hole honing, which comprises a base and a middle block, a first through hole is formed in the center of the base, a second through hole is formed in the middle block, the middle block is fixed on the upper surface of the base through a first bolt, and the first through hole and the second through hole are coaxial; the inner diameter of the first through hole is larger than that of the second through hole, and at least two screw holes are axially formed in the upper surface of the middle block around the second through hole; according to the product characteristic that the four unthreaded holes are formed in the large outer circle of the valve rod guide sleeve, the auxiliary mounting device for honing the inner hole of the valve rod guide sleeve is designed, so that when the auxiliary mounting device is used, the valve rod guide sleeve is locked on the middle block in the mode that second bolts penetrate through at least two unthreaded holes in the valve rod guide sleeve in a penetrating mode; and the valve rod guide sleeve can be honed conveniently through a horizontal turning procedure before honing and a vertical honing machine.

The present invention relates to a calcium silicate glass ceramic and a preparation method thereof. The calcium silicate glass ceramic has the following composition in weight percent: SiO 2 55~75, CaO13~22, Al 2 O 3 4~12, ZnO1~8, MgO / BaO1~8, alkali metal oxides 1~8, Li 2 O<1, colorant 0.5-1.5. The main crystalline phase of the calcium silicate glass ceramic is β calcium silicate (CaO.SiO 2 ), the restoration can be used directly after cutting and polishing, without the need for secondary sintering; it is more suitable for use as intra-crown restorations, inlays, high onlays, inlay crowns, veneers, etc. Moreover, the calcium silicate glass ceramic component in this invention does not contain or only contains trace amounts of Li, has low cost, and has good application prospects.

The invention relates to a copper-zinc alloy comprising: 66.0% to 73.0% by weight of Cu, 1.5% to 2.5% by weight of Si, 0.01% to 0.15% by weight of P, at most 0.1% by weight of Pb, the balance being zinc and unavoidable impurities.

The invention discloses a CrMnTi gear steel and a production method thereof, belonging to the field of gear steel bar steel. The gear steel comprises: C: 0.18%-0.22%, Si: 0.20%-0.30%, Mn: 0.90%-1.10%, S: 0.010%-0.020%, Cr: 1.00%-1.20%, Mo: 0.10%-0.20%, Ti: 0.040%-0.065%, Al: 0.020%-0.040%, B: 0.0020%-0.0040%, N: 0.010%-0.016%, Mg: 0.0035%-0.0065%, Ca: 0.0040%-0.0080%, and the balance is Fe and unavoidable impurities. The gear steel of the invention has good machinability.

The utility model discloses a planing cutter cylinder and a food processor with the planing cutter cylinder, and belongs to the field of food processing tools. The planing cutter cylinder comprises a cutter cylinder body, a plurality of planing holes distributed in a staggered mode are formed in the cylinder wall of the cutter cylinder body, planing blades are embedded in the sides, corresponding to the planing holes, of the cutter cylinder body, and the portions, protruding out of the planing holes, of the planing blades are fracture type flat blades. The fracture type flat blade is provided with a cutting edge protruding out of the outer cylinder wall of the cutter cylinder body, and the planing blade embedded in the cutter cylinder is high in strength and long in service life; and the fracture type flat blades corresponding to the planing holes have the cutting-in effect similar to teeth on food materials, the planing efficiency is high, not only can rhizome food materials be cut, but also hard food materials such as ice cubes can be cut and broken, the good cutting performance on different food materials is achieved, and the food material processing range is wider. The utility model further discloses a food processer with the planing cutter cylinder, the planing cutter cylinder is arranged on the food processer, so that the food processer has the functions of shaving ice, crushing and the like, and the requirements of consumers for making food such as ice food at home are met.

The invention discloses a silicon bronze alloy product and a preparation method thereof, and relates to the technical field of silicon bronze alloy products. Comprising the following steps that raw materials including 3.0%-3.5% of Si, 1.0%-1.5% of Mn, smaller than or equal to 0.1% of Fe, smaller than or equal to 0.05% of Ni, smaller than or equal to 0.02% of Zn, smaller than or equal to 0.02% of Pb and the balance Cu are mixed, and a mixture is obtained; casting the mixture to obtain a cast ingot; the cast ingot is subjected to high-temperature annealing at the temperature of 700-750 DEG C, and a blank is obtained; performing thermal deformation treatment and cold deformation treatment on the blank, and performing low-temperature annealing at 250-300 DEG C to obtain a silicon bronze alloy product; the microstructure of the silicon bronze alloy product comprises a copper matrix and a second phase distributed on the copper matrix, and the second phase comprises a Ni2Si phase, a Mn2Si phase and a Fe3Si phase. The silicon bronze alloy with high strength, high elasticity, excellent wear resistance and corrosion resistance and good processability can be produced by strictly regulating and controlling the ratio of the materials and optimizing the preparation process.

The present invention discloses an automatic trimming device for a gate in a lamp injection molding process, which belongs to the field of lamp production, and includes a frame, a mounting frame is provided above the frame, a grinding wheel is provided in the mounting frame, a servo motor for driving the grinding wheel to rotate is installed on the mounting frame, a mechanical arm for adjusting the angle of the grinding wheel is provided on the frame, the mounting frame is connected to the arm end of the mechanical arm, and further includes: a scraping mechanism provided on the mounting frame, and when the grinding wheel is working, the scraping mechanism is used to remove dust on the surface of the grinding wheel. The present invention can remove dust impurities adhering to the surface of the grinding wheel by setting the scraping mechanism while the grinding wheel is working, so as to avoid dust accumulation on the surface of the grinding wheel, so as to make the grinding effect of the grinding wheel uneven, thereby affecting the size and shape of the gate, and causing the product to fail to meet the specification requirements, and the surface of the grinding wheel can be blown by the setting of the blowing part, and the removal effect of the scraping mechanism can be improved by the airflow.

This utility model provides a fabric cutting device for an overlock sewing machine based on a composite cutter. The fabric cutting device includes a movable upper fabric cutting blade, a fixed lower fabric cutting blade, and a cutting blade driving mechanism. The upper fabric cutting blade includes an upper blade base and an upper blade shearing part fixed at the lower end of the upper blade base. The lower end of the upper blade shearing part is provided with an upper blade edge and an upper blade guide limiting part extending downward from the tail of the upper blade edge. The upper blade shearing part is made of cemented carbide. The lower fabric cutting blade includes a lower blade edge at the top. The hardness of the material of the lower fabric cutting blade with the lower blade edge is lower than that of the upper blade shearing part. During the process of the cutting blade driving mechanism to engage the upper and lower fabric cutting blades, the upper blade guide limiting part is close to one side of the lower fabric cutting blade, and at least a portion of the part of the lower fabric cutting blade that is close to the upper blade guide limiting part is made of cemented carbide. This application effectively extends the service life of the upper and lower fabric cutting blades, reduces the operating cost, and improves the fabric cutting effect.

The application discloses a cerium-containing austenitic free-cutting steel and a preparation method thereof. The cerium-containing austenitic free-cutting steel contains, in percentage by mass, 0.1-0.4% of C, 1.5-2.0% of Mn, 0.1-0.3% of Si, 6.0-8.0% of Ni, 15.0-17.0% of Cr, 0.1-0.2% of Mo, 0.1-0.5% of S, 0.001-0.3% of Ce, and the rest is Fe and inevitable impurities. The cerium element is reasonably added in the austenitic free-cutting steel, the morphology, size, length-width ratio and distribution of sulfides in the free-cutting stainless steel are effectively controlled and improved, the free-cutting stainless steel has not only good cutting performance, but also very good mechanical properties.