200results about How to "Guaranteed geometric tolerance" patented technology

The invention discloses a machining method for a valve body. The valve body to be machined is horizontally clamped on a workpiece revolving platform of machining equipment by using a clamping clamp, and a plane to be machined of the valve body is adjusted to be perpendicular to the workpiece revolving platform of the machining equipment, so that an intersection point of a central axis of the plane to be machined of the valve body is overlapped with a revolving center of the workpiece revolving platform, and the machining method requires that an extension line of a central axis of a cutter revolving body of the machining equipment is intersected with that of the revolving central axis of the workpiece revolving platform; and after a machining part is machined, a next machining part can be machined every time when the workpiece revolving platform is turned for an angle. The invention also discloses the clamping clamp and the machining equipment for realizing the machining method. According to the machining method, the clamping clamp and the machining equipment, all machining can be finished with one person and one machine, so that the aims of reducing the clamping frequency, increasing the machining efficiency, reducing investment in human resources and reducing manufacturing cost of a product are fulfilled. The machining method can also be used for machining a part with a plurality of machining surface perpendicular to the same reference planes, and has broad universality.

The invention discloses a method for processing key grooves of a shaft, which comprises the following steps that: two V-shaped iron blocks are fixed on a worktable of the common milling machine; a workpiece shaft to be processed is put into V-shaped grooves of the two V-shaped iron blocks; a connecting disc is arranged on one end face of the workpiece shaft to be processed, and an alignment block is fixed with the connecting disc, so that two alignment surfaces of the alignment block are vertical or parallel to the radius direction of the key grooves to be processed; the workpiece shaft and the alignment block are aligned, and the workpiece shaft and the two V-shaped iron blocks are pressed on the worktable by pressing plate bolts and pressing plates; and the key grooves on the same bus are processed by an end milling cutter in rough and fine modes, a workpiece is rotated 90 or 180 degrees, and the processes are repeated so as to process the key grooves on a plurality of buses of the workpiece shaft. By the method, the form and position tolerance of a product is ensured, a few parts are used, the structure is simple, and the workpiece is conveniently, quickly, safely and reliably clamped.

The invention relates to a thin-wall aluminum alloy material tube-shell part cutting processing heat treatment process which comprises the following steps: carrying out quenching and aging solution treatment by adopting a blank; improving the cutting property of a material; relieving stress by adopting aging heat treatment after rough machining; carrying out semi-finishing, and then carrying out the aging heat treatment to further relieve machining stress so as to ensure the stress inside a machined part is completely released; after turning is completed, carrying out low-temperature heat treatment for stabilizing machining size for the last time. Practices indicate that the heat treatment process method can be used for achieving the purposes of eliminating the machining deformation of the part and stabilizing the machining size and ensuring that the size accuracy and form and location tolerance of the part meet the technical requirements.

The invention discloses a bonnet support processing method and clamp and processing equipment for a bonnet support. The bonnet support processing method includes fixing a bonnet support through the special clamp to enable the central line of the bonnet support to be coaxial with the processing equipment; cutting a flange plane and an end face of a valve rod nut through the processing equipment; changing a cutter, rough-boring or fine-boring a valve rod nut hole, assembling a seal seat and a gland box; changing a cutter to enable the cutter to be coaxial with the processing equipment, rotating a rotation disc at 180 degrees, and finish-milling a thread of the valve rod nut; changing a cutter to enable the cutter to be coaxial with the processing equipment, rotating the rotation disc at 180 degrees, and drilling a flange hole; rotating the rotation disc at 90 degrees, and drilling an eyelet bolt hole and a lubrication hole of the valve rod nut on the support; changing a cutter, rotating the rotation disc at 90 degrees, scraping reversely and facing the back end face of the flange hole; and after finishing processing the back end face of the flange hole, disassembling the bonnet support. By the bonnet support processing method, processing on components can be finished through being clamped only once, and product processing accuracy and quality are improved.

The invention relates to a technique for embedding a stainless steel tube in a large-size aluminum alloy casting blank, belonging to the technical field of casting. The technique comprises the following steps: manufacturing a wood mold with a pipe chase according to a drawing, and putting the wood mold into a sand box to manufacture inner and outer sand molds; halving the pipe chase according to the distribution and position characteristics of the pipe chase in the inner sand mold; inserting a connecting rod, of which the upper and lower ends are penetrated by binding wires, into the inner sand mold via a fraction distance point, connecting the upper end of the connecting rod to the sand box, and connecting the lower end of the connecting rod to a water pipe; closing the box, and casting; after the solution becomes solidified and cooled, removing the connection between the upper end of the connecting rod and the sand box to discharge; and cleaning by removing the exposed part of the binding wire at the lower end of the connecting rod, and taking out the connecting rod to produce the stainless steel tube embedded casting blank, wherein the connecting rod is preserved for later use. The invention is mainly used for casting home appliance mold casting blanks, has the advantages of low production cost and high casting blank yield, enhances the service performance of the molds, and greatly prolongs the service life of the molds.

The invention relates to a drill hole accurate positioning method in mechanical drilling process, including the following steps: 1) the datum plane of a plate is selected, two cylindrical pins with the same diameter of a drill head and a standard gauge block are selected as measuring pieces; 2) distance l2 between a hole a and one side of the plate is determined; 3) distance l1 between the hole a and the other side of the plate is determined; 4) the cylindrical pin in a drill fixture of a drilling machine is replaced into the drill head, and drilling is carried out on the positioning points, thus completing drilling of the hole a; 5) the center of a hole b is determined; 6) drilling of the hole b is completed according to the central position of the hole b. The invention is applicable to processing of general machine tool, operation is easy, side hole with high accuracy is processed, and high accuracy drill hole positioning by side and side hole as well as hole pitch is realized, so that processing accuracy thereof can be almost close to the processing accuracy of a numerical control machine and form and position tolerance is ensured to be within the processing requirement.

The invention relates to the machining technology for a steering gear, in particular to the machining technology for a rotary blade type hydraulic steering gear, comprising a machining procedure for an inside hole of a cylinder body and a sealing surface at the lower end of the cylinder body, a machining procedure for a sealing groove on the sealing surface at the lower end of the cylinder body, a machining procedure for appearance of a stationary blade and a machining procedure for the stationary blade and a connecting hole of the cylinder body, a combination machining procedure for the cylinder body, the stationary blade and a copper sleeve, a machining procedure for an inside conical hole of a rotor and a machining procedure for an incomplete arc surface of the rotor. The machining procedures of the invention can greatly improve the machining accuracy and efficiency of each main part of the rotary blade type hydraulic steering gear, lower the production cost, as well as improve the working efficiency and the product quality.

The invention relates to an automatic grinding and polishing machine for engine crankshafts. The automatic grinding and polishing machine comprises a front body and a rear body. A motor and a transmission adjusting device are sequentially disposed at the left end of the front body. An output shaft of the motor is connected with the transmission adjusting device. A tail positioning device is disposed at the right end of the front body. A crankshaft spindle polishing device is disposed between the transmission adjusting device and the tail positioning device. A first air cylinder is disposed on the crankshaft spindle polishing device. A crankshaft spindle clamp controller which is connected with the first air cylinder is further disposed on the front body. A crankshaft connecting rod polishing device and a crankshaft connecting rod clamp controller which are connected are disposed on the rear body. A second air cylinder is disposed on the crankshaft connecting rod polishing device. By the automatic grinding and polishing machine which is simple to operate and high in work efficiency, crankshaft spindles and crankshaft connecting rods can be polished simultaneously, quality requirements of crankshaft polishing can be guaranteed, and consistency of the spindles and the connecting rods can be increased.

The invention discloses a process for repairing a piston ring groove. The process includes the following steps of firstly, cleaning away carbon deposits and greasy dirt in the piston ring groove; secondly, roughly machining the ring groove before fusion covering so that mesh-shaped lines can be produced, and conducting measuring and grouping on the size of the ring groove in the rough machining process; thirdly, spreading fusion covering materials; fourthly, melting the fusion covering materials through a laser device, wherein a piston uniformly rotates in the process, and meanwhile lasers are controlled through programs so that the irradiation angle and the irradiation range can be ensured and the covering materials and base materials on the same plane can be evenly and effectively combined; fifthly, placing the piston in a well type electric furnace to be heated after laser melting is conducted, and conducting thermal insulation; sixthly, conducting turning on the ring groove; seventhly, conducting fine machining on the ring groove; eighthly, conducting fluorescent magnetic particle flaw detection on the repaired part of the ring groove so that the piston cracking in the fusion covering process can be prevented from being put into use. The piston ring groove which is repaired can completely replace a newly-manufactured piston, the service life of the product is prolonged, and obvious social benefits and economic benefits are achieved.

The invention relates to a low rudder supporting axle processed tooling and the main body of the processed tooling is a face plate provided with a central hole at the center thereof. The innovation points lie in: the upper part of the face plate is connected with a counterweight block, and the lower part thereof is provided with an angle iron; the angle iron is provided with two mutually-perpendicular right-angle planes, a first right-angle plane is connected with the face plate, and the other one is arranged at one side close to the central hole of the face plate and is provided with an installation hole and a positioning hole; and the positioning hole is internally connected with a positioning pin. The invention has the advantages that a base of the lower rudder supporting axle is fixedon the right-angle plane in which the angle iron faces the central hole of the face plate after being processed into a right-angle groove, the positioning pin is used for extending into the groove ofthe lower rudder supporting axle to position the bottom surface thereof and the groove, thus determining processing standard of the cylinder axis end surface of the lower rudder supporting axle and ensuring geometric tolerance among the cylinder axis, the bottom surface and the groove.

The invention provides a method for processing an eccentric inner hole. For processing the eccentric inner hole on a long-axis component, at least one eccentric sleeve is sleeved on the long-axis component, and the shared rotating shaft of the eccentric sleeve and the long-axis component is on the same axis with the rotating shaft of the eccentric inner hole. The method for processing the eccentric inner hole aligns the rotating shaft of the eccentric inner hole by adopting the eccentric sleeve, so that positions of the eccentric sleeve and the eccentric shaft can be corrected easily, and form and position tolerance of the eccentric inner hole of the long-axis eccentric component can be ensured. The method for processing the eccentric inner hole is simple and easy to implement and low in cost.

The invention belongs to the field of aluminum alloy production technologies, and relates to a technology capable of reducing generation of coarse grains on the surface of a vehicle extrusion-forged bar. An aluminum alloy is prepared from the raw materials in percentage by weight: 1.07-1.12% of Si, less than or equal to 0.1% of Fe, 0.01-0.04% of Cu, 0.62-0.65% of Mn, 0.88-0.93% of Mg, 0.15-0.18% of Cr, less than or equal to 0.03% of Zn, 0.02-0.05% of Ti, less than or equal to 0.03% of a single impurity, less than or equal to 0.1% of an impurity total, and the balance of Al, wherein the ratio of the Mg to the Si is 0.79-0.87. An aluminum alloy cast ingot prepared through the formula is subjected to solid solution heat treatment after extrusion, on-line water spray quenching treatment and stretch straightening, each technological parameter is controlled seriously, after an aluminum alloy extrusion bar is subjected to 545 DEG C*1 h solid solution heat treatment, the section has no the coarse grains, and the surface has no the coarse grains; and after the bar is forged, the thickness of a coarse grain layer of the section is less than or equal to 3 mm, and mechanical performance after170 DEG C*8.5 h can reach: the yield strength RP 0.2 is greater than or equal to 320 Mpa, the tensile strength Rm is greater than or equal to 360 Mpa, and the elongation percentage A is greater than or equal to 10%.

The invention relates to a hole machining fixture for irregular thin-wall cavity parts. The fixture comprises a fixture main body, a top pressing module, a support nail and a middle pressing module; workpieces are positioned in a cavity of the fixture main body; the top pressing module is arranged at the top of the fixture main body; the top pressing module butts against the upper end surfaces ofthe workpieces; through holes are uniformly formed in the cylindrical surface of the fixture main body; the middle pressing module penetrates through the through holes to butt against the side surfaces of the workpieces; the support nail is arranged on a base of the fixture main body; and a screw cap of the support nail butts against the bottoms of the workpieces. The hole machining fixture for the irregular thin-wall cavity parts is provided with the support nail capable of adjusting the heights of the workpieces at the bottom, is provided with the middle pressing module for centering and positioning the workpieces at the middle part, is provided with the top pressing module for axially locking the workpieces at the top, can effectively and stably control the deformation of holes, guarantees the aperture size tolerance and the form and location tolerance, achieves wide application range, and guarantees the part quality in the use process.

The invention discloses a method for machining a centering roller bearing inner ring with an oil hole on the inside diameter. The machining process route is as follows: roughly grinding end surfaces, roughly grinding inside and outside diameters, roughly grinding the inside diameter, roughly grinding roller tracks, tempering, finely grinding the end surfaces, finely grinding the roller track on one side, finely grinding the inside and the outside diameters, finely grinding the inside diameter, finely grinding the roller track on the other side, and super-grinding the roller tracks. The method can guarantee geometric tolerances of the bearing so that the bearing can meet the national standards.

The invention provides a supporting tool for machining and a method for machining a tensioning sleeve by using the supporting tool. The supporting tool comprises a base and a supporting body, an installing groove is formed in the end face of the base, the supporting body is inserted behind the installing groove, the supporting body and the installing groove are connected through screws, a threadedthrough hole is formed in the center shaft and at the position of a center axis where the base and the supporting body connect, and a groove is formed in the supporting body and corresponds to the threaded through hole. In the machining process, the supporting tool internally supports the interior of the tensioning sleeve intermediate, the tensioning sleeve intermediate is changed into a workingstate from a natural state to be further machined, the deformation direction and the deformation amount can be effectively controlled, the deformation range is reduced, so that the dimensional precision and the form and location tolerance of the tensioning sleeve can be accurately controlled; and the concentricity, the coaxiality and the circular runout precision of the tensioning sleeve under theworking state can be ensured, the production cost is effectively reduced, and the using effect of the tensioning sleeve is improved.

The invention discloses a novel dynamometer. The novel dynamometer comprises a front vertical plate, the rear side of which is provided with a rear vertical plate matched with the front vertical plate. The front vertical plate and the rear vertical plate are localized by positioning pins, and are connected together. An opening is formed between the front vertical plate and the rear vertical plate, and a brake is erected on the opening. The brake is erected between the front vertical plate and the rear vertical plate by a rotating shaft. The brake comprises a rotor disposed on the outer part of the rotating shaft in a sleeved way, and a stator matched with the rotor is disposed on the outer part of the rotor in a sleeved way. The front end of the rotor is fixedly provided with a rotor end cover. The rotor end cover is connected with a rotor cup, and the rotor cup is disposed on the outer part of the rotor. One end of the rotating shaft is extended out of the front vertical plate in a penetrating way, and the other end is disposed in the rear vertical plate. The end of the rotating shaft disposed in the rear vertical plate is connected with a code disc. The novel dynamometer is advantageous in that heat dissipation performance is better, and operation is more stable; during the operation of the dynamometer, hot air is led to the outside the first time, and a rapid cooling effect is achieved, and therefore the stable and normal operation of the dynamometer is guaranteed.

The invention relates to an automobile shifting fork automatic manufacturing combined machine tool, and mainly aims to solve the problems of difficulty in making a form and location tolerance between positioning reference surfaces as well as between the positioning reference surfaces and positioning reference holes be up to a design standard, low machining efficiency, high labor intensity, difficulty in controlling the product quality and high machining cost in the conventional automobile shifting forks. The automobile shifting fork automatic manufacturing combined machine tool is characterized in that a first upper plane milling power head (3), a second upper plane milling power head (4), a side plane milling power head (5), a round table end face milling power head (6), a drilling power head (7) and a reaming power head (8) are arranged in sequence from left to right above a bed body (1). The positioning reference surfaces and the positioning reference holes of an automobile shifting fork are machined through one-time clamping, so that the form and location tolerance between the positioning reference surfaces as well as between the positioning reference surfaces and the positioning reference holes of the automobile shifting fork are effectively ensured, the production efficiency is increased, the product quality is enhanced, a high degree of automation is achieved, and the demands of a large-scale automatic production line are met.

The invention relates to a manufacturing method for a large-specification high-precision iron core. According to the manufacturing method, a stamped and formed iron core sheet is subjected to high-temperature heat treatment firstly; then the surface of the iron core sheet is coated with glue; next, the iron core sheet is laminated into a stator iron core or a rotor iron core; the manufacturing method comprises the main steps of annealing heat treatment before lamination, an iron core gluing process, a process of die mounting and fixing, a baking process, and a laminating process; the laminating process is applicable to iron core sheets with or without heat treatment requirement, particularly an iron-nickel alloy type iron core sheet which normally requires heat treatment at a temperature of greater than 1,000 DEG C; and by adoption of the gluing and laminating ways in the manufacturing method, the lamination of the large-specification stator iron core or rotor iron core is realized, and the geometrical tolerance of the iron core can be well ensured.

The invention discloses a clamp for finish-turning inner and outer circles of an open circular ring work piece. The clamp comprises a clamp body, an inner pressing ring and an outer pressing ring. The end surface, opposite to a rotating shaft, of the clamp body is provided with a first positioning end surface vertical to the axis of the rotating shaft. The inner pressing ring is fixed to the end surface, opposite to the rotating shaft, of the clamp body, is concentric with the rotating shaft, and comprises an inner hole positioning segment and a first end surface positioning segment. The first end surface positioning segment is provided with a second positioning end surface vertical to the axis of the inner pressing ring. The outer circle of the inner hole positioning segment is concentric with the inner pressing ring, and matches an inner hole of a compressed blank. The outer pressing ring comprises an outer circle positioning segment and a second end surface positioning segment. The second end surface positioning segment is provided with a third positioning end surface vertical to the axis of the outer pressing ring. An inner hole of the outer circle positioning segment is concentric with the outer pressing ring, and matches the outer circle of the compressed blank which is finish-turned. According to the invention, the verticality between the inner and outer circles and the end surfaces, the size precision of the inner and outer circles, and the form and location tolerance can be guaranteed. The invention also discloses a finish-turning method by the use of the clamp, and another clamp for finish-turning the inner and outer rings of the open circular ring work piece.

The invention relates to a digital controlled lathe for processing an engine crank shaft connecting rod. The lathe comprises a lathe base, a four-shaft linkage system controller, a first servo motor, a front rotating machine body, a turntable, a turning machine surface guide rail, a turning machine surface guide sleeve, a first lead screw, a lead screw fixing element, a cutter frame guide rail, a cutter fixing seat, second servo motors, a cutter handle, turning cutters, a second lead screw, a transmission shaft, a back following machine body and a turning machine surface. The servo motors are controlled to rotate by the four-shaft linkage system controller, so the turning machine surface is indirectly driven to leftwards and rightwards move, the axial processing dimension of the crank shaft connecting rod is realized, the two front and back second servo motors are controlled to rotate so that the front and back turning cutters are indirectly driven to forwards and backwards move, and the radial processing dimension of the crank shaft connecting rod is realized. The digital controlled lathe has the advantages that a digital controlled operation system is adopted for replacing an original hydraulic system, the operation is simple and convenient, the work efficiency is high, the processing dimension consistency is improved, and the equipment fault repair rate and the processing cost are reduced.

The invention discloses a method for machining an ultra-large roller. A vertical lathe is used for machining a bearing installing position located at one end of a roller shaft, a roller body is arranged outside the roller shaft in a sleeved mode, a boring mill is used for welding a reference block in the center of the side portion of the roller body, the upper reference face and the lower reference face of the reference block and the center of the roller shaft are symmetrically arranged, the vertical reference face of the reference block is perpendicular to the upper reference face and the lower reference face, the boring mill is used for machining a slewing bearing installing position at the other end of the roller body, and taper plates and a connector are correspondingly welded to the two ends and the top of the roller body. The coaxiality of the two ends of the roller is guaranteed, machining investment is reduced, and the application range is widened.