162 results about "Machinability" patented technology

The present invention relates to the technical field of other processing of metals. Disclosed are a free-machining titanium material and a preparation process therefor. The free-machining titanium material comprises: a matrix component group and free-machining component groups, wherein at least one of the free-machining component groups is added to the matrix component group; the matrix component group comprises the following components in percentage by mass: 0-1.0% of Fe, 0-0.08% of N, 0-0.02% of H, 0-0.50% of O, 0-8.0% of Al, 0-15.0% of V, and the balance being titanium and inevitable impurities; and the free-machining component groups are an RE element and S element group, a Cu element and S element group, a Zr element group, a C element group, a B element group, and an Mg element group, respectively. The preparation process involves producing the described free-machining titanium material by using any one of the following three methods: vacuum arc remelting, vacuum floating melting, and powder metallurgy. The present invention solves the technical problem of how to further improve the machinability of titanium materials.

The thin-gauge ultrahigh-strength non-oriented silicon steel comprises the following chemical components in percentage by mass: less than or equal to 0.002% of C, 3.1%-4.0% of Si, 0.3%-0.7% of Mn, less than or equal to 0.01% of P, less than or equal to 0.001% of S, 0.5%-1.2% of Als, 0.01%-0.08% of Sn, less than or equal to 0.002% of N, less than or equal to 0.001% of Ti, less than or equal to 0.002% of Nb, less than or equal to 0.002% of V and the balance of Fe and inevitable impurities, and Sieq is equal to [wSi] + 2 [wAl]-0.5 [wMn]. According to the technical scheme, trace alloy elements do not need to be added, the alloy smelting difficulty can be reduced, the smelting production cost is saved, meanwhile, the means of increasing deformation structures and improving the content of silicon, aluminum and manganese elements are adopted, and the material has the advantages of being high in strength, high in electromagnetic performance and excellent in machinability at the same time.

Provided are a lithium disilicate glass-ceramic green body, a preparation method therefor, and a use thereof. The lithium disilicate glass-ceramic green body comprises a lithium disilicate main crystal phase, crystal size in the lithium disilicate glass-ceramic blank being between 50 and 400 nm, and the proportion of the area of crystal grains having a length greater than 350 nm to the total area being less than 30%. The present disclosure, by means of controlling the internal crystal size of the lithium disilicate glass-ceramic green body to be below 400 nm, enables same to be directly machined without damaging the machining equipment, and combines the advantages of high strength, machinability and direct coloration. This can reduce the waiting time for patients to receive dental restorations, solve the problem of patients being unable to know the color of all-ceramic dentures before fabrication, and overcome a bottleneck for all-ceramic denture restoration materials for same-day delivery. It has great significance for achieving preoperative color matching and rapid restoration in clinical practice.

The present application provides a kind of big coil easy cutting steel and its production process, component: C≤0.09%, Si≤0.005%, Mn:0.90~1.65%, P:0.04~0.09%, S:0.30~0.50%, Al≤0.030%, N≤0.0060%, O≤0.0140%, the balance is Fe and inevitable impurities.Compared with prior art, the present application controls LF furnace refining process activity oxygen range, cooperates with suitable big coil production process parameters, including soaking temperature, soaking time, opening rolling temperature, coiling temperature, controls coiling temperature range=J±15℃, J=(4×Mn / S+LF activity oxygen)+800℃.In this temperature interval, the final product sulfide spindle is properly controlled when coiling.The final surface quality is excellent, the product rod sulfide spindle rate is high, C-shaped scrap accounts for more than 90%, and the cutting performance is excellent.

This invention relates to the field of alloy technology, specifically disclosing a microalloyed copper alloy tube and its preparation process. The copper alloy tube is composed of the following components by mass percentage: Ni 0.05%-0.15%, Sn 0.05%-0.15%, Fe 0.01%-0.1%, P 0.02%-0.04%, with the balance being Cu and unavoidable impurities. The mass ratio of Sn to Ni is controlled between 0.5 and 3. It possesses a single face-centered cubic α-phase crystal structure, with an isometric grain ratio ≥85% in the microstructure and an average grain size of 10-20 μm. The preparation process achieves a three-dimensional strengthening effect of solution treatment, precipitation, and grain refinement. The product exhibits a tensile strength of 250-270 MPa, an elongation after fracture ≥45%, and a yield strength ratio of 0.32-0.36, combining high strength, low yield strength ratio, excellent machinability, and corrosion resistance. It is energy-efficient and easily mass-produced.

The utility model relates to the technical field of grinding, in particular to an agglomerated abrasive wire product and a grinding tool, the agglomerated abrasive wire product comprises an installation base body layer and a grinding layer, and the grinding layer and the installation base body layer are of an integrated structure; the grinding layer is provided with a plurality of grinding material base bodies, each grinding material base body comprises grinding material aggregates and a brittle medium base body, and the brittle medium base bodies and the grinding material aggregates are of an integrated structure. The utility model mainly aims to provide an agglomerated abrasive wire product which aims to prevent grinding scraps from being adsorbed on the outer surface of agglomerated abrasives and among the agglomerated abrasives, maintain the cutting performance of the abrasives and improve the grinding quality and efficiency.

This invention discloses a method for preparing a large round billet for continuous casting of forged cold-rolled roll sleeves, comprising: controlling the composition system, wherein the chemical composition of the raw material steel is: C: 0.65-0.75%, Si: 0.25-0.40%, Mn: 0.35-0.50%, P≤0.020%, S≤0.020%, Cr: 1.90-2.10%, Ni: 0.30-0.45%, Mo: 0.20-0.40%, V: 0.05-0.10%; and controlling the continuous casting process parameters, wherein the superheat is controlled within a certain range. The casting temperature is maintained between 15 and 35°C, the casting speed is kept stable at 0.24 ± 0.01 m / min, the crystallizer water flow is controlled at 3700 L / min, and the secondary cooling water flow in the crystallizer is controlled at 0.12 L / Kg. During continuous casting, a 200 A / 2.5 HZ electromagnetic stirring of the casting flow and a 500 A / 1.2 HZ strong end electromagnetic stirring are used. The heat treatment process parameters for the continuously cast round billets are controlled as follows: red-charging annealing of the continuously cast round billets, furnace charging temperature ≥ 400°C, heating rate ≤ 100°C / h, holding at 730°C for ≥ 15 h, furnace cooling to 400°C, and air cooling upon exiting the furnace. This invention ensures the hardness and wear resistance of the cold-rolled roll sleeves while improving toughness and machinability, avoiding surface cracking and internal cracking of the roll sleeves during the casting and forging processes, ultimately achieving high-efficiency production and long service life of the roll sleeves.

The invention relates to the technical field of steel production, in particular to a steel plate for an intermittent drive motor, which comprises the following chemical components in percentage by mass: less than or equal to 0.003% of C, 0.50-1.50% of Si, 0.5-1.5% of Mn, 0.02-0.06% of P, less than or equal to 0.001% of S, less than or equal to 0.002% of N, 0.05-0.15% of Mo and 0.20-1.00% of Als. And the balance of Fe and inevitable residual elements. The electromagnetic performance requirement can be met, the mechanical strength machining performance can be considered, the operation efficiency and reliability of the intermittent drive motor are improved, and the production cost is reduced.

A crescent-edge hard alloy milling cutter and a parameter design method thereof relate to the technical field of milling cutter design. The crescent-edge hard alloy milling cutter includes a front cutter head, a peripheral blade portion, and a shank portion, where a plurality of crescent peripheral blades extending helically toward the front cutter head are provided on the peripheral blade portion; a plurality of crescent cutting blades are provided on the front cutter head; and the crescent cutting blade and the crescent peripheral blade are in arc transition in pairs. With the design of the crescent cutting blade and the crescent peripheral blade, the crescent-edge hard alloy milling cutter has excellent cutting performance. Moreover, the crescent cutting blade and the crescent peripheral blade are in the arc transition, ensuring smoothness of the milling cutter to cut a metal workpiece.

The invention provides a silver-nickel-titanium electric contact material and a preparation method thereof. By adopting a nickel-titanium alloy material as a main additive, the welding resistance of the electric contact material is improved while the good machinability of the material is maintained. NiTi is introduced as a main additive to be added into an Ag matrix to improve the fusion welding resistance of the material, meanwhile, a small amount of trace copper is also added to mainly improve the wettability of the material, and the C powder and the titanium carbide powder improve the fusion welding resistance of the material. In addition, a powder metallurgy process is adopted, material proportion is easy to control, process flow is short, and cost is low. The rapid plasma electric spark sintering speed is high, the time is short, and the material density is high.

The application provides a thick-gauge cutting blade steel 75Cr1 open flat and a production method thereof, compared with the prior art, the application optimizes a conventional transverse cutting plate production process, especially for thick-gauge 12-20mm, high-strength 75Cr1, by means of a hot coil direct sheath annealing intermediate process, plasticity is improved, and cutting property is improved; in the transverse cutting process, by means of ''small deformation straightening'' and a non-edge cutting process, excellent thick-gauge cutting blade steel 75Cr1 open flat is generated. The application judges whether the hot-rolled strip steel is subjected to sheath annealing before transverse cutting according to the size of the critical value Agt of the hot-rolled strip steel and the size of the critical value A 临 of fracture occurring in the straightening process, selects the sheath annealing process according to the need, and saves the cost. In addition, the annealing process designed in the application can improve the microstructure and performance of the product, so that the product performance of the thick steel plate meets the requirements.

The application belongs to a kind of shell processing method, aiming at the technical problems of low machining precision and easy deformation during the processing of hemispherical shell, provides a kind of hemispherical shell and its processing method, by optimizing the structure shape of raw material blank, the material blank consumption is reduced by about 10%, in the processing process, the clamping position is close to the processing position by optimizing the process clamping step, so that the machining process can increase the rough machining cutting amount, and the clamping positioning can be repeated, the positioning accuracy is improved, the production process is easy to operate, according to the material and cutting performance of the hemispherical part, by using the processing technology and tooling, the machining deformation of the hemispherical part is greatly reduced, and the qualified rate of batch production is effectively improved.

The invention provides a high-conductivity free-cutting copper alloy material and a preparation method thereof, and belongs to the technical field of alloy smelting. The preparation method of the high-conductivity free-cutting copper alloy material comprises the following steps: (1) smelting: heating and melting cathode copper, and covering with crystalline flake graphite in the melting process; and boron-copper alloy deoxidation, high-purity tellurium and high-purity iron powder are added. A graphite bell jar is used for adding. The temperature is increased to 1200-1250 DEG C, and heat preservation is conducted for 15-30 min so that alloy elements can be homogenized; adjusting the furnace temperature to 1170-1190 DEG C, and casting into an ingot through a high-purity graphite mold; (2) hot extrusion forming; (3) pickling and hydraulic drawing; and (4) straightening and sizing to obtain the required copper alloy material. According to the copper alloy material, at the room temperature (25 DEG C), the conductivity is larger than or equal to 90% IACS, the machinability is 80% or above higher than that of an HPb63-3 material in the same state, and the tensile strength is larger than or equal to 350 MPa when the cold machining deformation is 50%.

The invention relates to the technical field of drill point design, and particularly discloses a drill point cutting performance evaluation method and device.The drill point cutting performance evaluation method comprises the steps that a drill point three-dimensional model is controlled to conduct drilling simulation on a machined part three-dimensional model according to the main shaft rotating speed and the feeding speed in machining parameters, and drilling parameters in the drilling simulation process are obtained; evaluating the drill point according to the obtained drilling parameters so as to obtain an optimal drill point suitable for the processed workpiece; compared with a method for directly drilling a solid plate by adopting multiple drill needles to determine which drill needle has a relatively ideal drilling effect, the method for evaluating the cutting performance of the drill needle provided by the embodiment of the invention has the advantages that the efficiency of selecting the optimal drill needle suitable for the processed workpiece is higher, the test period is greatly shortened, a real probe does not need to be adopted, the cost is lower, and the method is suitable for popularization and application. And the test result is not influenced by the environment.

The application provides a design method of an adaptive milling cutter with adjustable curvature, and relates to the technical field of cutter design and manufacturing. The application defines a cutter radius and a fillet radius, constructs a transition curve from a peripheral edge part to an end edge bottom part through a Bezier curve, establishes a cutter rectangular coordinate system, determines a Bezier curve parameter equation based on control point coordinates, calculates a curvature and a change rate, and then finds a control parameter combination that makes a target function value maximum by discretizing the control point coordinates, calculating the target function value and optimizing and solving, so as to realize accurate regulation and control of the cutter curvature, optimize a blade edge geometric shape, and improve the adaptability and cutting performance of the cutter under complex machining conditions.

The present application relates to large ring piece detection technical field, especially to a kind of portable detection method and instrument of large ring piece flatness and machining allowance, the method includes first establishing the workpiece coordinate system being fixed with ring piece, and based on the coordinate system, the circumferential thickness distribution is quickly obtained, the upper end surface profile curve is generated, the defects types such as whole inclination, local concave-convex or periodic wave deformation are diagnosed synchronously by real-time analysis to profile curve, then, different fine scanning strategies are adaptively triggered according to the diagnosis result, to obtain corresponding high-precision topographic data, finally, the end surface flatness error and global minimum machining allowance are calculated by fusing multi-source data, and the process machinability of ring piece is directly judged accordingly.The present application realizes closed loop from rapid detection, intelligent diagnosis to process decision, solves the problems of low efficiency, inaccurate defect judgment, detection and machining decision disjointedness in large ring piece field detection.

This invention discloses an environmentally friendly copper alloy with excellent comprehensive performance. Its composition includes: Sn: 3-5 wt%, Ni: 0.3-1.5 wt%, P: 0.03-0.3 wt%, S: 0.2-0.6 wt%, Al: 0.005-0.3 wt%, with the balance being Cu and unavoidable impurities. The microstructure of this copper alloy comprises Cu₂S phase and Ni₃S₂ phase, with the Cu₂S and Ni₃S₂ phases accounting for 1-6% of the total area. In the sulfides of the copper alloy microstructure, the Ni₂S phase accounts for more than 10% of the total area. This copper alloy is lead-free and possesses good machinability, mechanical properties, hot working properties, and corrosion resistance. This invention also discloses the preparation method and applications of this copper alloy.

This invention provides a steel with excellent machinability, capable of suppressing cracks during hot working and melt cracks during high-frequency quenching, and exhibiting excellent fatigue strength when used as a component in mechanical structures. The steel contains, by mass percent, C: 0.20–0.50%, Si: 0.01–0.80%, Mn: 0.50–2.00%, P: less than 0.030%, S: 0.010–0.095%, Cr: 0.01–1.30%, V: greater than 0.200% and less than or equal to 0.300%, Bi: 0.0051–0.1500%, and N: 0.0030–0.0200%, and satisfies the following formula (1). In the steel, the number density of fine Bi particles is 80–8000 particles / mm. 2 The number density of coarse Bi particles is 10 particles / mm. 2 Below. 0.80≤C+(Si / 10)+(Mn / 5)-(5S / 7)+(5Cr / 22)+1.65V≤1.50(1).

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 relates to a low-cost high-yield-strength free-cutting titanium alloy and a preparation method thereof. The low-cost high-yield-strength free-cutting titanium alloy comprises the following chemical components in percentage by mass: 0.25%-0.32% of Fe, 0.27%-0.34% of O, 0.80%-0.90% of Cu, 0.25%-0.35% of S, 0.35%-0.45% of La, 0.75%-0.85% of Ce, 0.10%-0.20% of C, 0.12%-0.15% of B and the balance of Ti and inevitable impurities. Wherein the Fe, the Cu and the S are added in the raw material mixing process in the form of matte. The steel plate is prepared by adopting the processes of vacuum consumable smelting, hot rolling cogging and hot continuous rolling. When the consumable electrode is prepared through vacuum consumable smelting, the size and distribution uniformity of rare earth sulfide in a cast ingot can be improved by adding Fe, Cu and S into low-cost matte and changing a material distribution structure. The hot continuous rolling process comprises the three stages of rough rolling, intermediate rolling and finish rolling, the intermediate rolling and finish rolling temperature meets the grain refinement requirement, and the finish rolling and finish rolling temperature meets the yield strength stability requirement. Compared with the prior art, the steel has excellent free-cutting performance, high yield strength and homogeneity, and the preparation cost is remarkably reduced.

This invention discloses an aerospace aluminum rod with good ductility and low impurity content, and its preparation method, belonging to the field of metal material processing technology. The aerospace aluminum rod has an aluminum content ≥99.5%, an iron content of 0.20%-0.25%, a silicon content ≤0.04%, and a hydrogen content ≤0.22 ml / 100g Al. By precisely controlling the Fe content within the preferred range of 0.20%-0.25%, combined with multi-stage refining and purification, precise temperature-controlled casting, and surface quality control, this invention significantly reduces the impurity content of the aluminum rod, refines the grain structure, and improves its machinability and ductility. It achieves excellent processing performance, producing 200,000 meters of continuous 0.361mm ultrafine single wire without breakage, making it suitable for the large-scale production of high-end aluminum alloy wire bundles in photovoltaic, new energy vehicle, and other fields.

This invention provides a low-cost production process for low-C mold steel plates. The chemical composition of the steel plate, by weight percentage, is C=0.31%~0.41%, Si=0.2%~0.4%, Mn=1.3%~1.7%, Cr=1.5%~2.0%, Mo=0.20%~0.35%, Nb=0.10%~0.30%, P≤0.010%, S≤0.005%, with the remainder being iron and unavoidable trace chemical elements. The manufacturing process employs differential temperature rolling, with two-stage water cooling pre-cooling of the cast billet before rolling; the initial rolling temperature is 870±30℃, and the final rolling temperature is 820±30℃; after rolling, it is ultra-rapidly cooled to 500℃, with an initial cooling temperature of 780~800℃, a reddening temperature of 500~550℃, and then air-cooled to room temperature. The resulting mold steel plate exhibits excellent uniformity in cross-sectional hardness, with a hardness difference between the core and the edge of HRC≤2.0, tensile strength≥1150MPa, and transverse impact energy≥35 J. It also possesses excellent wear resistance, impact resistance, and good machinability.

Provided is stainless steel for a cutting tool, the stainless steel for a cutting tool having superior workability than in the past.　The stainless steel for a cutting tool has a composition comprising, by mass, 0.41-0.50% of C, 0.10-0.40% of Si, 0.1-1.5% of Mn, Ni and Cu alone or in combination such that Ni + Cu = 0-0.50%, 11.5-12.3% of Cr, Mo and W alone or in combination such that Mo + W / 2 = 0-0.30%, and 0.04-0.12% of N, with the balance made up by Fe and unavoidable impurities, the stainless steel for a cutting tool being characterized by having a hardness of 190 HV or less at room temperature.

The utility model belongs to the technical field of reamers, particularly relates to a double-inner-cooling-hole hard alloy reamer used for cutting, and aims to solve the problems that an existing single-inner-cooling-hole reamer is limited in cooling effect and difficult to meet some high-precision and high-efficiency machining, the following scheme is provided: the double-inner-cooling-hole hard alloy reamer comprises a reamer body, a reamer holder and a mounting head, the double-channel structure is adopted, the flow of a cooling medium is greatly increased, the heat dissipation area is greatly increased, heat in the cutter body can be taken away more quickly, the cooling effect is more remarkable than that of a single channel, the first inner cooling branch channel, the inner cooling branch pipe and the second inner cooling branch channel extend to the outer side of the cutter body, and the cooling effect is better. The cooling medium can be directly guided to cutting areas such as the cutting edges, especially near the first cutting edge and the second cutting edge, the parts generate most heat in the cutting process, targeted efficient cooling can be achieved, tool abrasion can be reduced, the service life of the cutting edges can be prolonged, the cutting performance of the cutting edges can be improved, and the requirements for high-precision and high-efficiency machining are met.

Provided is a tool head in a head replaceable cutting tool configured on the basis of a novel idea so as to allow external measurement to be easily performed, while allowing cutting performance to be maintained. The tool head in the head replaceable cutting tool has a substantially cylindrical shape, and can be fastened to a shank held on a machine tool, and moreover includes an insert mounting seat on which a cutting insert is to be detachably mounted, the tool head further including a point, a line, or a surface that defines a reference surface from which a cutting edge of the cutting insert has a predetermined length to a predetermined portion thereof.

The invention discloses a double-tooth sun gear machining method and an inner hole allowance determining method, and relates to the technical field of gear machining. The machining method of the double-tooth sun gear sequentially comprises the steps of blank forging, semi-finish turning, outer circle tooth A hobbing, inner hole and two end face coating of an anti-seepage agent, carburizing, quenching, shot blasting, finish turning, inner hole tooth B rough gear shaping machining, inner hole tooth B fine gear shaping machining, outer circle tooth A grinding machining, burn inspection, magnetic powder inspection, tooth part precision detection and bench work. The inner hole allowance is determined by adopting test bars with the same material and the same process, and accurate reservation is realized through quantitative calculation by detecting the radial hardness distribution rule of the test bars. The core technology is a combination method of differential seepage prevention, test bar allowance quantification and staged machining, the machinability of inner hole and end face seepage prevention is ensured before carburization, the performance is ensured through normal hardening of outer teeth, hardened layer residues and material waste are avoided through precise allowance, and the bearing performance of the inner teeth is ensured.

This invention relates to a method for producing low-density, high-strength, and high-toughness protective steel plates from continuously cast billets, belonging to the field of metallurgy. The steel plate is an Fe-Mn-Al-C series austenitic low-density steel plate with an austenitic matrix supplemented by dispersed fine precipitated carbides, achieving high strength and high toughness, thus meeting the requirements for ballistic protection. The steel plate has a production thickness of 6-12 mm, a width of 1600-3000 mm, and a density of 6.75-7.05 g / cm³. 3 It has a density 7.85 g / cm³ higher than that of conventional steel. 3 The steel plate exhibits at least a 10% reduction in weight, good machinability and weldability, and excellent ballistic protection performance. A 6mm thick steel plate meets the NATO AEP STANAG 4569 standard Level I ballistic protection requirements, while a 12mm thick steel plate meets the NATO AEP STANAG 4569 standard Level II ballistic protection requirements. Production process: smelting—continuous casting—slow cooling—rolling—heat treatment—finishing—inspection—warehousing.

Provided are a non-quenched and tempered steel wire rod with improved machinability and impact toughness and a method for manufacturing the same. The non-quenched and tempered steel wire rod according to the present disclosure includes, in percent by weight (wt%), 0.3% to 0.5% of C, 0.4% to 0.9% of Si, 0.5% to 1.2% of Mn, 0.02% or less of P, 0.01% to 0.05% of S, 0.015% to 0.05% of sol.Al, 0.1% to 0.3% of Cr, 0.007% to 0.02% of N, and the remainder including Fe and inevitable impurities, has a microstructure in which an average thickness of the pearlite layer in a L cross-section, which is parallel to a rolling direction, is 30 µm or less, an average grain size of ferrite is 20 µm or less, and Relational Expressions 1 to 5 are satisfied. 20≤Mn / S≤70 1.4≤Al / N≤7 0.7≤Mn+Cr≤1.4 0.2≤C / Mn≤0.7 0≤Mnc / Mnf≤3.

This invention discloses a corrosion-resistant free-machining brass alloy, its preparation method, and its applications. The corrosion-resistant free-machining brass alloy is composed of the following components by mass percentage: Cu: 58.0~62.5%, Si: 0.3~1.2%, Ni: 0.1~0.5%, Mn: 0.3~0.7%, B: 0.005~0.025%, with the balance being Zn and unavoidable impurity elements, wherein the total content of unavoidable impurity elements is <0.3%. The brass alloy of this invention possesses excellent machinability, corrosion resistance, and mechanical properties, and is lead-free, meeting environmental protection requirements and satisfying the needs of various fields for brass alloy materials.