43results about How to "Accurate dimensional accuracy" patented technology

This invention provides a casting method characterized by comprising the step of fixing a core to an upper mold to provide an upper mold assembly, the step of pouring a minimized amount of molten metal necessary for providing a cast product into a concave in a lower mold, the step of moving the upper mold assembly at a predetermined first speed and lowering the upper mold assembly to a predetermined height just above the surface of the molten metal in the concave, the step of varying the lowering speed of the upper mold assembly from the first speed to the predetermined second speed to further lowering the upper mold assembly from the predetermined height, the step of detecting information about the state of the upper mold assembly in such a state that the upper mold assembly has been superimposed on or lowered toward the lower mold, and the step of stopping of the lowering of the upper mold assembly after the detection that the state information has reached predetermined state information. The core is fixed to the upper mold depending upon a frictional fitting relationship between mechanical means, an adhesive, and a core-side fitting protrusion and the concave fitting part, or the engagement relationship between a core-side engaging projection and molding sand to be tamped down.

A rotary lobe pump comprises a pump body having a driving means and an outer casing, and an insert that can be replaced. The replaceable insert comprises a housing formed of a plastic material and having an inlet port, an outlet port and internal surfaces defining a pumping chamber. The replaceable insert also includes a pair of lobed rotors arranged for rotation within the pumping chamber. The housing includes apertures through which the lobed rotors may be rotationally driven, so that the lobed rotors mesh together for pumping a fluid from the inlet port to the outlet port.

An object is to provide a roller lifter which can maintain a proper dimensional accuracy of an outer diameter. A shaft (25) rotatably supporting a roller (30) is inserted through a pair of opposed portions (21) and swaged to be fixed. A cylindrical portion (61) is disposed to be fixed at a relative position to the opposed portions (21). Upon rotation of a cam (90), the cylindrical portion (61) is reciprocated via the roller (30). The roller lifter (10) includes a first member (20) in which the shaft (25) is swaged to be fixed to the opposed portions (21) and a second member (60) separate from the first member (20) and couplable via a coupling member to the first member (20). The second member (60) includes at least the cylindrical portion (61).

The invention relates to a lever arm detection platform. The lever arm detection platform comprises a platform base, the platform base is in a rectangular shape and provided with four supporting legs at the bottom; the upper surface of the platform base is a plane, and the position of one side of the upper surface of the platform base is provided with a supporting circular platform; the center of the supporting circular platform is provided with a threaded hole; a supporting piece is arranged in the threaded hole; a locking nut is arranged on the lower part of the supporting piece; the position of the other side of the upper surface of the platform base is provided with a positioning lug boss butted with a lever arm; the center of the positioning lug boss is provided with a positioning pin butted with a central hole of the lever arm; the upper part of the positioning pin is provided with a compression nut; and the distance between the center of the supporting circular platform and the center of the positioning lug boss is equal to the distance between the center of the central hole of the lever arm and the center of one of reamed holes. The lever arm detection platform provided by the invention can fast and accurately measure the dimension accuracy of the lever arm and judge whether the lever arm is qualified or not.

The invention discloses a sleeve protecting core. The sleeve protecting core comprises a core body, wherein the core body is successively and coaxially provided with a core first part, a core second part, a core third part, a core forth part, a core fifth part and a core sixth part from left to right, wherein the periphery of the core fifth part is provided with a first groove in an annular manner, and four second grooves are uniformly distributed in the periphery of the core fifth part; the length directions of the second grooves are parallel to an axis of the core body, the second grooves are formed in a way that one end, which is close to the core sixth part, of the core fifth part extends towards the core forth part and can not run through the core fifth part. The sleeve protecting core has high dimensional precision and can be used for many times. The invention also discloses a processing method of the sleeve protecting core, the processing method can enable the sleeve protecting core in a stamping mould to be accurate in precision, the productive process is qualified once, and the product rejection rate is low.

The invention discloses a central shaft cutting-off mechanism for an eight-shaft spring forming machine, which belongs to spring machining mechanical equipment. The mechanism is formed by combining a computer closed loop technology with a central shaft and cutting-off integrated design; all machining processes of a central shaft mechanism and a cutting-off mechanism of the spring forming machine are controlled by computer programs; parameters corresponding to springs of different models are set in a computer; and when a spring of a certain size is required to be machined, intelligent operation and data control can be realized only by inputting a corresponding parameter. The mechanism improves the performance and the reliability of a machine, has high sensitivity, quick response and high dimensional accuracy, reduces manual operation capacity, improves working efficiency, is safely and conveniently operated, and reduces energy source consumption. In the mechanism, central shaft and cutting-off integration is realized, so that a spring steel wire is not provided with a tail hook after being cut off; therefore, the mechanism has high product machining accuracy, and improves product quality and production efficiency.

The invention relates to a cutting tool for finishing workpieces, comprising at least one insert (13) for preliminary machining with a geometrically defined cutting edge (15) and at least one insert (13) for final machining with a geometrically defined Define the cutting edge (23) of the blade (21). The tool is characterized in that the insert (13) for preliminary machining is a part of a preliminary machining stage (3) and the insert (21) for final machining is a part of a final machining stage (5), and a The interface (9) provided between the processing stage (3) and the final processing stage (5) is provided with a first planar surface (27) and a second planar surface (29), which are respectively arranged on the preliminary processing stage (3) and the final processing stage (5), and has a device (11) to ensure the coaxiality between the preliminary processing stage (3) and the final processing stage (5).

The invention discloses a method for performing a measurement to the size of the triangle truss type spud leg and the local precision during the process of constructing a jack up drilling platform, wherein, the large scale truss type spud leg segmenting data detecting method of the invention comprises the detecting procedures that: the main size of the spud leg is detected; the main size of the spud leg comprises a spud leg segmenting length (L1), a spud leg segmenting height (H1), a distance from a gear rack plate to a spud leg (Z1, Z2 and Z3), and a gear rack plate space (B1, B2, B3); the levelness of the gear rack plate and the crown of the gear rack plate end face are detected; the middle point (P5) of an end part gear rack central line is fetched to detect the same face degree of the gear rack plate. The invention has the advantages that the invention is convenient and advisable and has high detection precision, under the support of a high precision instrument, the exact dimensional accuracy, a tolerance and a derivation can be obtained, thereby guiding a construction process, guaranteeing the quality of the final drilling platform, reducing the possibility of the platform damage, and ensuring the safety of an offshore operation.

The invention discloses a welding mold of electric mover, which comprises mold working table, mold convex block, mold base, card groove, connection block, back plate, side plate, fixing groove, extrusion block, resistant Thermal anti-skid pad, pressure box, first partition, extrusion rod, side hole, moving plate, buffer pad, ball, baffle, threaded column, first self-locking nut, fixed frame, second self-locking nut, threaded hole , a second partition, a gasket, a first spring plate, a second spring plate and a reinforcement plate, the mold base is welded to the bottom of the mold workbench, and a slot is provided at one end of the mold base, and the mold base Both sides of the workbench are welded with side plates, and the surface of the mold workbench is welded with mold convex blocks. The motor mover assembly welding mold uses wire cutting to process the required steel plates for assembly and welding, and the dimensional accuracy of the processed parts is The high error is small, and the secondary processing after welding can ensure the required verticality, parallelism, and more accurate dimensional error.

The present invention relates to a continuous rotary extrusion forming method for a waney metal-plate rotary extrusion belt pulley with the outer wheel circle being provided with a V-shaped groove, and comprises the procedures of feeding, extension, shape correction, perforation, edge cutting, distribution and rotary extrusion forming; at the rotary extrusion forming procedure, a pre-forming wheelwith a small-diameter U-shaped groove and a large-diameter U-shaped groove is used to perform the rotary extrusion on the Y-shaped cup-shaped belt pulley roughcast of an edge belt after the distribution procedure, and then a forming wheel with a small-diameter V-shaped groove and a large-diameter V-shaped groove is used to perform the forming rotary extrusion so as to be made into a formed wheelof a waney metal-plate rotary extrusion belt pulley; the value range of M and N is: M is more than or equal to 1 and is less than or equal to 10, and N is more than or equal to 1 and less than or equal to 10. The belt pulley that is produced with the forming method hereinabove has good dynamic and static balancing performance, and guarantees the size requirements when simultaneously driving two elements; the jumping consistence of the circle of the V-shaped groove surface is good; at the same time, the processing method also has the advantages of long service life of the distributing wheel andthe forming wheel, simple processing procedures and short processing period.

The invention provides a variable camber thin-walled part hoop flow forming device and method, and relates to the forming device and method of a variable camber thin-walled part with the axis as a space curve. The forming device and method solve the problem that a split forming method and a combined welding method are used for forming the variable camber thin-walled part with the axis as the space curve. According to the forming device, the shape of a mold cavity is a variable cross-section channel with the mold cavity axis as a space curve, the shapes of the cross sections of a section mold cavity from the inlet end to the closed end are sequentially a circular shape, a wide and short axis oval shape, a narrow and short axis oval shape, a kidney shape and a crescent moon shape, a core mold is arranged in the section mold cavity, a plurality of load injecting holes are formed in the side wall of the core mold, and a plunger is arranged in a soft mold cavity. The forming method comprises the steps that first, landing edge design is conducted on plate blank; second, the positions of the load injecting holes are designed; third, tubular plate blank is arranged between the core mold and a section mold; fourth, a visco-elastic plastic soft mold is injected into the soft mold cavity; fifth, the plunger is pushed to inject the visco-elastic plastic soft mold into the core mold cavity; sixth, the variable camber thin-walled part is taken out. The variable camber thin-walled part hoop flow forming device and method are used for forming the variable camber thin-walled part.