41results about How to "Solve Dimensional Accuracy Issues" patented technology

The invention discloses a numerically-controlled processing method of a nozzle housing piece. According to the method, a numerically-controlled machining/milling combined processing center is adopted and comprises two main shafts and an on-line measurement device; the workblank of the nozzle housing piece is a die-forged part, and the die-forged part is made of a nickel-based high-temperature alloy. The method comprises the following steps: designing a nozzle housing processing path; performing polishing treatment on the die-forged part to remove burrs from the die-parting face and end-face die-drawing taper; coarsely machining the tail part of the work piece; performing numerically-controlled machining/milling on the whole work piece; performing numerically-controlled fine machining of the head part of the work piece; cleaning and marking the work piece; and inspecting. The method provides the reasonable designs of processing path and processing method of the work piece as well as the processing positioning reference of the work piece, and completes the processing of the inner cavity, the outer circle, the lateral adapter, the positioning pin and other parts of the nozzle housing piece within one-step loading process. The method solves the problem that the die-forged part has a complex structure and a thin wall and has strict requirements for dimensional precision and positional precision; and overcomes the defects of long processing period, low production efficiency and poor dimensional precision and positional precision.

The invention provides a thermal deformation error compensation method for a dry-cutting numerically-controlled gear hobbing machine tool and workpieces. According to the invention, while thermal deformation error compensation is carried out on the dry-cutting numerically-controlled gear hobbing machine tool by virtue of a thermal deformation error compensation system for the numerically-controlled machine tool, the thermal deformation errors of workpieces machined by the dry-cutting numerically-controlled gear hobbing machine tool are compensated by virtue of the same compensation system. The thermal deformation error compensation method comprises the following steps: firstly, establishing a thermal deformation error model for the workpieces and a thermal deformation error model for the dry-cutting numerically-controlled gear hobbing machine tool, integrating said error models in an online compensator, and during machining of the dry-cutting numerically-controlled gear hobbing machine tool, processing the temperature data obtained through measurement of temperature sensors by virtue of the online compensator to obtain error compensation values; secondly, conveying the compensation values to a machine tool numerically-controlled system; and finally, carrying out coordinate offset by virtue of the numerically-controlled system, thus realizing thermal deformation error compensation for the dry-cutting gear hobbing machine tool and the workpieces.

The invention relates to a motor end cover which comprises a metal heat dissipation piece (1) and an injection moulding piece (2), wherein the injection moulding piece comprises a bearing chamber (21) positioned at the center and a positioning clamp opening (22) positioned at the periphery; and the metal heat dissipation piece (1) is embedded between the bearing chamber (21) and the positioning clamp opening (22). The invention has the advantages of simple manufacture, lower cost, higher precision, light weight, high stability and easy heat dissipation.

The invention discloses an assembly welding method of a fan-shaped block welding assembly. By using a clamp positioning adjustable structure, welding deforming control is achieved, gap coping of blades and inner-and-outer templates is convenient, and specifically, the bottom face of a T-shaped plate is positioned through a T-shaped plate right positioning sliding seat, and the side faces of the T-shaped plate are positioned through a T-shaped plate side face positioning block; the T-shaped plate and the positioning sliding seats on the two sides of the T-shaped plate are stored in a fixed base body structure which is composed of a bottom plate, a left angle seat and a right angle seat, the positions are well adjusted, and pressing and fixing are conducted by using an upper face pressing plate and side face pressing plates; and the bottom face and an outer arc of a runner plate are positioned by using a runner plate right positioning sliding seat. The assembly welding method of the fan-shaped block welding assembly has the advantages that (1), machining efficiency is improved; and (2), the economic benefits are improved.

The invention provides a method for testing a dielectric constant and a loss angle tangent parameter of an antenna cap material. The method comprises the steps of: setting a testing waveguide length according to a testing frequency band, connecting the testing waveguide to a network analyzer, calibrating the network analyzer, testing an initial phase and a standing wave; placing a test block with wavelength of odd number times of that of a half waveguide or any length, measuring the phase and the standing wave by using the network analyzer; and scanning the dielectric constant of the material by using a parameter scanning function of an Ansoft HFSS (High Frequency Structure Simulator), setting the dielectric constant of the material to be 3.3-3.4 and the step length of the material to be 0.01, and obtaining a scanning simulation result of the phase. By adopting the invention, accurate testing of the dielectric constant and the loss angle tangent parameter of the antenna cap material is effectively improved, and the dielectric constant and the loss angle tangent (tan delta) parameter of a dielectric material can be obtained. The invention has the advantages of increasing working efficiency and reducing correlation of the testing precision and the size of a sheet to be tested.

The invention discloses an additive hot-pressing inflatable composite forming method for a topological structure wallboard, belongs to the technical field of precision sheet metal processing, and solves the defects of poor integrity, difficulty in appearance precision control or higher cost in existing technical processing. The forming method comprises the following steps of step 1, determining positions of reinforcing ribs and a topological structure of a topological structure wallboard blank required by hot-pressing forming; step 2, preparing the topological structure wallboard blank by an additive; step 3, manufacturing a hot-pressing forming die of the topological structure wallboard; step 4, placing the topological structure wallboard blank in a cavity of a hot-pressing forming die, and performing hot-pressing forming on the topological structure wallboard blank; and step 5, forming a closed cavity between the topological structure wallboard blank and an upper die, communicating the closed cavity with an external gas source through a vent hole, and performing ventilation and pressurized correction on the closed cavity in order to enable a curved surface part between the reinforcing ribs of the topological structure wallboard to form a smooth curved surface. According to the method, the surface quality of parts is improved.

The invention discloses an automatic loading, unloading, shaping and installing integrated robot for an IGBT chip. The automatic loading, unloading, shaping and mounting integrated robot can realize automatic mounting of the IGBT chip, can effectively solve the problem that the size precision of the chip after pin shearing, bending and forming is affected due to chip positioning errors of two machining procedures of pin shearing and bending. The robot comprises a rack, a tray used for placing an IGBT module; an automatic chip discharging machine used for outputting the chips in the chip material pipe one by one; a chip shaping station comprising a chip pin shearing and bending device, wherein the chip pin shearing and bending device is used for carrying out pin shearing and bending on the pins of the chips so as to realize pin shearing and bending of the pins of the chips; and a chip mounting station used for carrying the chip which passes through the chip shaping station and is subjected to pin cutting and bending of the chip pins to the IGBT module on the tray.

The invention discloses a magnetoelastic grinding burn detection method for an acid-corrosion-resistant steel gear to solve the problems that acid corrosion detection influences the size precision androughness of a gear and the defect distinguishing degree of acid corrosion detection of an existing acid-corrosion-resistant steel gear is not the same as that of a conventional steel gear. Before ato-be-detected gear part is detected, an acceptance standard calibration value and a warning value are determined according to a contrast gear part and a gear defect part, a detector is directly adopted to detect the grinding burn defect without damage during the subsequent detection of the to-be-detected gear part, and the to-be-detected gear part does not need to be subjected to acid corrosion.

The invention provides a processing center spindle inner bore checking fixture. The checking fixture comprises a checking sleeve and a go/no-go gauge matched with the checking sleeve, wherein the front end of the checking sleeve extends into the spindle inner bore; an outer edge is arranged at the rear end of the checking sleeve; a through hole is arranged on the side wall of the checking sleeve; and a ball is mounted in the through hole. The checking fixture provided by the invention has a simple structure, can accurately and quickly check whether the processed center spindle inner bore is qualified, and improve the processing precision of the center spindle inner bore.

The invention discloses a vertical compression type horizontal die-casting machine and a die-casting method thereof and belongs to the field of metal die-casting. The vertical compression type horizontal die-casting machine comprises a supporting mechanism, an injection mechanism and a die locking mechanism, wherein the die locking mechanism comprises a movable die base, a fixed mounting plate, head plates arranged on the fixed mounting plates, tail plates arranged on the movable die base, pull rods hinged between the head plates and the tail plates and crankshaft rods connected with the pullrods and the head plates. When the movable die base instantly retreats and the included angle between the two pull rods is approximately horizontal, the vertical compression type horizontal die-casting machine transmits original backward push force of the movable die base to the T-shaped crankshaft rods, torque is greatly reduced, and the rebound effect is further reduced further through pressurestabilization of a gas resistor. A one-way valve is arranged at a feed port, and the vertical compression type horizontal die-casting machine conducts accurate feeding to prevent the situation of non-uniformity of the solution injection amount. The problems that a movable die base is likely to instantly retreat and the size precision of die cast parts is affected in the die-casting process of an existing die-casting machine are solved.

The invention discloses a vehicle, a handrail for the vehicle and a control method for the handrail. The handrail comprises a base, a body which is arranged on the base and can rotate when collected between a first position close to the roof of the vehicle and a second position for holding, and a hydraulic energy storage assembly which is arranged on the base and is connected with the body, wherein when the body rotates from the first position to the second position under holding force, the hydraulic energy storage assembly can supply damping force to prevent the body from rotating from the first position to the second position; and when the body rotates from the second position to the first position, the hydraulic energy storage assembly can supply resetting force to drive the body to return to the first position. According to the handrail disclosed by the invention, the body can be closely fitted to the roof of the vehicle under a condition that the handrail is not used, and the phenomenon that the body cannot be reset can be avoided; and furthermore, the steadiness of rotation of the body between the first position and the second position can be also guaranteed, and the phenomenon that the body is collided with the roof is avoided.

The invention discloses an engine dry cylinder liner machine body foam model. A water jacket sand core is arranged at a water jacket part between an engine cylinder liner and a machine body; and multiple fixed support clamps are arranged in a machine body foam model at the outer side of the water jacket sand core. The invention further discloses a manufacturing method of the engine dry cylinder liner machine body foam model; the fixed support clamps are put in corresponding positions in a mold for preparing the foam model; magnets are put at the outer side of the mold for sucking the fixed support clamps; and a foam material is added for preparing. When an evanescent mode is used for casting a dry cylinder liner machine body of an engine, the fixed support clamps are inlaid in the foam model, so that the phenomenon of shifting the sand core in the casting can be effectively prevented, and the product pass percent is improved.

The invention discloses a working method for a foam cutting machine using a thermal cutting technology. The working method comprises the following working steps of firstly, placing a foam body to be cut on a base plate of the machine, enabling the foam body to be abutted against a width positioning plate, connecting a power supply and turning on a switch; secondly, adjusting a potentiometer knob on a panel to enable a resistance wire to cut and fuse foam when the resistance wire is not subjected to the thrust basically; thirdly, adjusting the positioning plate according to the size required to be cut, taking the leftward-offset distance as the size of the foam to be cut with the resistance wire as a zero graduation during adjustment and then screwing down the positioning plate; and fourthly, pushing the foam forwards at constant speed, wherein the stress condition of the resistance wire is displayed by the brightness of an LED (Light Emitting Diode) on the panel in real time. According to the working method disclosed by the invention, due to the adoption of the mode, quick cutting of small-size foam can be realized; an incision is smooth and no foam and chip or noise is generated in work; and a cutting size aligning device is simple and practical in structure and low in cost and solves the problem of the dimensional precision of finished products.

The invention discloses a preparation method of a wear-resistant steel plate. The preparation method comprises the following steps: 1) mixing, 2) sintering, and 3) casting heating and crystallization. Compared with the prior art, the preparation method has the following advantages: with the adoption of a special raw material ratio, the produced wear-resistant steel plate is high in performance index, good in glossiness and stability, and high in overall density and surface density, and is not prone to break, and the dimensional precision, production efficiency, die life and cost problems of the existing precision protection steel plate are solved.

A punching head structure comprises a fixed plate, two clamping structures, an ejection structure, a punching structure and a control unit, wherein a through hole is formed in the middle of the fixedplate, and a first supporting piece and two second supporting pieces are arranged on the two sides of the through hole respectively; each clamping structure comprises an inner support block, a plurality of sliding rods, a first elastic element and a clamping block; the ejection structure comprises an ejection block, an ejection rod and a first pushing mechanism; the punching structure comprises asecond pushing structure, a guide sliding plate, two guide sliding shafts, a pushing plate, a plurality of second elastic elements, a pressing plate and a plurality of punching blades; and the controlunit is connected with the first pushing mechanism and the second pushing structure and controls the opening and closing of the first pushing mechanism and the second pushing structure. By utilizingthe punching head structure, the problem that at the present stage, a metal part is extremely prone to deformation due to clamping by a chuck of a lathe, and consequently the size precision, shape precision and position precision of a workpiece are affected is solved.