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

The invention discloses a cubic boron nitride grinding wheel with low-temperature and high-strength microcrystalline glass ceramic binder. The cubic boron nitride grinding wheel consists of a matrix, a binding course and a grinding wheel block. The grinding wheel block is a cubic boron nitride grinding wheel block, and adopts the following raw materials (according to the weight percentage of the content): 45 to 80 percent of cubic boron nitride abrasive, 0 to 20 percent of corundum, and 20 to 35 percent of ceramic binder; the ceramic binder is the microcrystalline glass ceramic binder, and the raw material composition and the weight percentage content is as follows: 40 to 70 percent of SiO2, 5 to 25 percent of B2O3, 2 to 5 percent of Al2O3, 2 to 15 percent of Na2O, 2 to 5 percent of K2O, 2 to 4 percent of MgO, 2 to 4 percent of CaO, 1 to10 percent of Li2O, 2 to 5 percent of ZrO2 and 2 to 5 percent of Sb2O3. The invention provides a high efficiency grinding tool which has the advantages that the using linear speed of the grinding wheel can be 160 m/s, the process precision is high, the service life is long, the environment pollution is avoided, and the high efficiency grinding tool can be matched with a high speed high efficiency numerical control crankshaft grinder and is mainly used in the grinding machining of car crank shafts and various numerical control.

In a solenoid valve, a desire valve stroke width may be set, and a flow rate may be returned to an original flow rate even when that the flow rate is changed. A solenoid valve includes a drive portion having a bobbin including a slidable hole formed there through, a fixed iron core disposed with in the bobbin and a movable iron core disposed to be slidable within the slidable hole, and a valve function portion having a valve body extending from the movable iron core and disposed in a leading end of a valve shaft passing through the fixed iron core and a valve seat with which the valve body is brought into close contact and from which the valve body is separated. In the solenoid valve, a predetermined gap width is formed between the valve body and the valve seat, when the solenoid valve is not energized, to open the valve, and the movable iron core is drawn to the fixed iron core when the solenoid valve is energized to close the valve. A valve stroke width may be adjusted by screwing a flow rate adjusting screw from an outer side in a rear end of the solenoid valve to bring the leading end into contact with a rear end surface of the movable iron core when the valve is opened, thereby adjusting a protrusion amount of the screw in the leading end of the slidable hole.

The invention provides a method for manufacturing a frame of a bicycle. The method comprises the following steps of: (1) manufacturing frame fittings, wherein the frame fittings comprise frame pipes and joints, the frame pipes comprise an upper pipe, a back upper fork, a back lower fork, a lower pipe and a middle pipe which are all made of aluminum alloy, and the joints comprise a head pipe joint, a middle pipe joint and a five-way joint which are all made of magnesium alloy; (2) processing surfaces of the frame fittings; (3) molding the frame pipes and the joints by gluing; (4) grinding and polishing the frame; and (5) performing baking finish on the surface of the frame. The whole frame utilizes the gluing molding technology so that the frame has beautiful appearance, better streamline form, and higher size precision; furthermore, the deformation and stress concentration caused by welding in the traditional manufacturing method are eliminated.

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.

The invention discloses a female die for stamping of automobile parts. The female die comprises a female die body. The female die body comprises a female die first part, a female die second part and a female die third part, wherein the female die first part, the female die second part and the female die third part are coaxially arranged in sequence from left to right. The outer diameter of the female die first part is larger than that of the female die second part, and the outer diameter of the female die second part is larger than that of the female die third part. A first middle hole is formed in the center of the female die first part, and the depth of the first middle hole is larger than the axial thickness of the female die first part. A second middle hole which is coaxial with the first middle hole and communicated with the first middle hole is formed in the center of the female die third part, and the diameter of the first middle hole is larger that that of the second middle hole. The female die has high dimensional precision, and can be used repeatedly and guarantee manufacturing precision and assembly precision of the automobile parts which are manufactured through the female die. The invention further discloses a machining method of the female die. By means of the machining method, the dimensional precision of the female die in a stamping die is high, the female die can be qualified at a time through the production process, and the product rejection rate is low.

The invention provides a high-accuracy numerical control eight-axle helical compression spring former. The former comprises a machine tool body, an alignment mechanism, a press feeding mechanism, an upper reducing mechanism, a pitch mechanism, a mandril, a middle reducing mechanism, a lower reducing mechanism, a computer control box, an upper cut mechanism and a lower cut mechanism. The former isdesigned by combining machinery, the computer closed ring technology and pneumatic technology, the whole machine tool realizes intelligent operation, and eight-axle data control is realized, so that the performance and reliability of the former are improved along with high sensitivity, quick response and accurate dimension accuracy, the manual operation amount is reduced, the working efficiency is improved, the operation is safe and convenient, and energy consumption is saved. In the former, 'mandril-cut' integration is realize to ensure that no tail hook exists in cutting, and a three-axle design is adopted for the reducing mechanism to ensure that the product has high processing accuracy, and the product quality and production efficiency are improved.

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 reciprocating-type T-shaped cutting head, comprising a T-shaped fixed cutting head, a T-shaped movable cutting head and a drive block for driving the T-shaped movable cutting head. Both the T-shaped fixed cutting head and the T-shaped movable cutting head are provided with two rows of cutting gears; the T-shaped fixed cutting head is provided with a positioning raised line; and the T-shaped movable cutting head is provided with a positioning chute adapted to the positioning raised line. The cutting head provided by the invention operates reliably, can shave long beard effectively and is beneficial for shaving short beard from the root by other cutting heads, thereby improving the shaving efficiency and saving the shaving time for users.

The invention discloses a tungsten steel push rod. The tungsten steel push rod comprises a cylindrical push rod body, wherein the push rod body comprises a first push rod part, a second push rod part and a third push rod part which are arranged coaxially from left to right; a groove is annularly formed around the axis of the push rod body outside the first push rod part; four first planes are uniformly distributed on the periphery of the second push rod part in an annular form; four second planes are uniformly distributed on the periphery of the third push rod part in an annular form; a first threaded hole is formed in the center, far away from the second push rod part, of the third push rod part, and extends into the first push rod part from the third push rod part, but does not penetrate through the first push rod part; a second threaded hole is formed in one of second arc surfaces along the axial direction which is perpendicular to the push rod body, and extends into the first threaded hole. The invention also discloses a machining method for the tungsten steel push rod. By the machining method, the size precision of the tungsten steel push rod is accurate, the production process is qualified at one time, and product obsolescence rate is low.

The invention provides reducing mechanisms for an eight-axis spring forming machine, and belongs to springing machining mechanical equipment. Each reducing mechanism comprises a servo motor, a support, a nut, a ball screw, a sliding block base, a sliding block, a reducing cutter holder, a reducing cutter, a front wallboard, concave V-blocks and convex V-blocks. In the invention, the reducing mechanisms are designed by combining a computer closed-loop technology with a reducing three-axis design; machining procedures of the reducing mechanisms for the spring forming machine are controlled by computer programs, thus realizing intelligent operation, improving performance and reliability of the machine, achieving high sensitivity and fast response speed as well as accurate dimensional accuracy, reducing manual operation amount, improving operating efficiency, ensuring safety and convenience in operation and saving energy consumption; combinations of the convex V-blocks and the concave V-blocks at 70 degrees are respectively utilized as guide rails of the sliding block and the sliding block base, which reliably and stably ensures dimensional accuracy of external diameter and shape accuracy of the spring to be machined; and by utilizing the three-axis design, the machining accuracy of the product is high, thus the product quality and production efficiency are improved.

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 mini-type sliding block. The mini-type sliding block comprises a fixing mechanism, returning mechanisms, sealing mechanisms and separation mechanisms, wherein the returning mechanisms are clamped at two sides of the fixing mechanism; the sealing mechanisms are fixedly connected with two ends of the returning mechanisms; the separation mechanisms are fixedly connected withone side, far away from the corresponding returning mechanism, of the sealing mechanisms; the fixing mechanism is composed of a first connection hole, a mounting frame, a first roller path, a connection clamping groove, a guide rail groove and a fixed plate. The mini-type sliding block is compact in structure, and convenient and simpler to process; a grinding technology adopts a special tool jigto clamp, so that the precision and perpendicularity of the sliding block are improved; the size precision of a product is more accurate and the product is very smoothly matched with a plastic part; automation can be realized on a mounting part, so that a lot of manpower and material resources are save and the labor cost is reduced; a steel ball is changed into a nylon material from a previous metal roller path; nylon has a self-lubrication condition so that the collision and friction between the steel ball and a metal wall is reduced, the service life of the product is relatively increased and the utilization cycle of a user is prolonged; the production cost is reduced.

The invention provides a spiral upper cone casting mold and process, and belongs to the technical field of casting. The spiral upper cone casting mold comprises a mold core forming portion used for manufacturing blade mold cores, and a wax mold forming portion used for accommodating a plurality of wax cores and used for manufacturing a spiral upper cone wax mold. According to the spiral upper conecasting mold, the spiral upper cone wax mold is divided into a plurality of equal portions, then the blade mold cores with the upper portions provided with forming grooves matched with spiral upper cone blades in shape are manufactured through the mold core forming portion, the blade mold cores are placed in the wax mold forming portion according to the shape of a spiral upper cone, then wax liquid is injected into the wax mold forming portion, and the spiral upper cone wax mold is formed through one-time injection molding. The circumstance that the spiral upper cone is divided into multipleportions, and then all portions of the wax mold are spliced to form a complete spiral upper cone wax mold is avoided, the size precision between all the portions of the spiral upper cone is more accurate, and meanwhile, the deformation amount of the wax mold is reduced.