34results about How to "Efficient precision machining" patented technology

The invention discloses a spiral bevel gear cutting machine tool and a gear cutting method. The gear cutting machine tool comprises a cutting tool system, a workpiece system, a machine tool body and a numerical control system, wherein the cutting tool system comprises an XZ working table, an X-axis lead screw, a Z-axis lead screw, a short shaft, a tool base revolving drum, a tool base, No.1 milling cutters, a milling cutter shaft, No.2 milling cutters, a gear shaft and a correcting wedge. The rotating centre line of the tool base revolving drum and the rotating centre line of the short shaft are collinear; the right end surface of the tool base revolving drum is fixedly connected with an annular flange plate at the left end of the tool base by the correcting wedge; the right end of the tool base is provided with the milling cutter shaft; the rotating centre line of the milling cutter shaft and the rotating centre line of the short shaft are intersectant; and both ends of the milling cutter shaft are provided with the No.1 milling cutters, the No.2 milling cutters or grinding wheels. The left end surface of the tool base is provided with a drive motor; the drive motor is meshed with a bevel gear on the milling cutter shaft by the gear shaft; and the rotating centre line of the output shaft of the drive motor and the rotating centre line of the milling cutter shaft are vertically intersectant. The invention also provides a method for processing helical bevel gears by utilizing the machine tool.

The invention discloses a molding grinding wheel for grinding small-hole threads of hard and brittle materials and belongs to the technical field of machinery manufacturing. The molding grinding wheel is characterized in that the axial section included angle alpha of the disc-shaped molding grinding wheel is determined by the formula alpha=alpha0 Dalpha, wherein the alpha0 is the thread standard thread angle, the Dalpha is the grinding wheel axial section profiling quantity Dalpha corresponding to the minimum thread profile error deltamin; the diameter DS of the disc-shaped molding grinding wheel is determined by the formula DS=d0+zetah0, wherein the h0 is the height of the thread profile, the d0 is the diameter of a cutter bar, and the zeta is a correction factor; and the diameter of the cutter bar d0 is determined by the formula d0=lambdah0, wherein the lambda is a proportionality coefficient. A composite plating process is adopted to enable diamond or cubic boron nitride (CBN) micro powder grains to be solidified on the surface of a base body of the disc-shaped molding grinding wheel. The molding grinding wheel has the advantages that the problems of severe abrasion, breakage, low efficiency and failure of drying process of screw tap tools for processing the small-hole threads of hard and brittle materials are solved, chips discharge is smooth, coolants are not needed to add, and precise and efficient process of the small-hole threads of the hard and brittle materials is achieved.

The invention provides a magnetic toughening method for inhibiting machinery damage of hard and brittle materials and belongs to the technical field of quality control of machinery process. Accordingto the method, a hard and brittle material is immersed in a clamping mold filled with a magnetorheological fluid, and then the magnetorheological fluid infiltrates into pores, cracks and other defectson the surface layer of the hard and brittle material and liquid-state encapsulation is formed around workpieces; and during machining, a controllable magnetic field is applied such that the magnetorheological fluid is affected by the magnetic force to generate a magnetorheological effect and a high-viscosity elastic film having high yield strength is formed. Thereby, the magnetorheological fluidin the defects on the surface layer of the hard and brittle material is solidified to form a hole-sealed toughening mechanism. The magnetorheological fluid around the material is solidified to form three-dimensional circumferential compressive pre-stress encapsulation, and impact vibration and energy applied by cutters such as a grinding wheel, etc. on the workpieces can be absorbed, and it is helpful for inhibiting the cracks from extending in the deep radial direction or towards side edges. Thereby, defects such as cracks, surface fracture, breaking of edges, etc. are reduced, and machiningquality is improved.

The invention discloses a large-sized bridge type gantry mixed machining machine tool which is characterized by comprising a base (1), a working corridor (2), a machine tool body (3), an X-axis feeding system (4), a cross beam (5), a Y-axis feeding system (8), a slide carriage (7), a square ram (11), a Z-axis feeding system (12), a C-axis feeding system, an A-axis feeding system, an actuation mechanism interface (13) and an actuation unit library (15). By combination of a modern additive manufacturing process and a milling process, efficient and precision machining of a large-size die is realized, and the efficiency is 10 times or much higher than that of machining with a conventional die, but the cost is only 30 percent of that of a conventional process; and the large-sized bridge type gantry mixed machining machine tool meets a customization requirement and intelligence and flexibility requirements in the future and has good prospect. The large-sized bridge type gantry mixed machining machine tool replaces a conventional casting die, can quickly make a response to a demand of a client, and saves the die investment by 60 percent or above.

The invention discloses a sharp knife device capable of changing knives. The sharp knife device capable of changing the knives comprises a base, a linear motor, a slide part, a grating ruler used for detecting sliding displacement of the slide part, and a drive assembly for driving the slide part to rotate, wherein the slide part comprises a fixed part and a slide part; the fixed part can be rotatably mounted on the base; the drive assembly can drive the fixed part of the slide part to rotate; when the fixed part rotates, the slide part rotates along with the fixed part; one end of the slide part can be rotatably connected onto an output shaft of the linear motor; the other end of the slide part is fixedly equipped with a knife disc; the motion direction of the output shaft of the linear motor is parallel to or superposed with the slide direction of the slide part; and two knives are mounted on the knife disc. The sharp knife device capable of changing the knives provided by the invention also can guarantee part processing precision after changing the knives.

The invention belongs to the field of numerical control machining of gears and relates to an equal-arc-length slotting method of non-circular gears. Through the equal-arc-length slotting method of the non-circular gear, a workbench, gear blanks, a main shaft and a gear slotting cutter are used, wherein the workbench is used for driving the gear blanks to rotate; the main shaft drives the gear slotting cutter to rotate; a gear slotting cutter divided circle is tangent to a gear blank section curve and is capable of purely rolling; the gear slotting cutter moves along an X-axis direction in the plane to form the gear blank section curve; the gear slotting cutter moves along a Z-axis direction to form the whole-tooth depth of the gear blanks; the gear slotting cutter or the gear blanks are also capable of additionally rotating; the gear blanks also carry out equal-arc-length movement relative to a machine tool in the end surfaces of the gear blanks; other shafts are linked relative to the machine tool. The equal-arc-length slotting method is capable of slotting internally-meshed non-circular straight gears and bevel gears and is also capable of slotting externally-meshed non-circular straight gears and bevel gears; the gear blanks are also capable of additionally rotating during slotting the bevel gears; through the equal-arc-length slotting method, the purpose of processing the non-circular gears with high efficiency and high accuracy can be achieved; compared to other methods, the machining efficiency is highest under the requirement of same accuracy.

The invention belongs to the technical field of precision machining, and particularly relates to a polishing pad self-finishing polishing device and a using method thereof. The polishing pad self-finishing polishing device comprises a shell, a finishing module, a polishing module, a polishing disc, a transmission shaft, a driving module, a polishing pad and a controller; the shell is placed horizontally; the finishing module is installed at the right end of the upper side of the shell; the polishing module is located at the left end of the upper side of the shell; the polishing disc is located at the upper part of an inner cavity of the shell and used for containing the polishing pad; the polishing pad adheres to the upper side of the polishing disc; the upper end of the transmission shaft is connected with the polishing disc, and the lower end of the transmission shaft is connected with the driving module; the driving module is used for driving the polishing disc to rotate; the controller is used for controlling work of each module. According to the polishing device, the finishing module, the polishing disc, the polishing module and the transmission shaft are matched to work, so that high-flatness polishing can be carried out on a workpiece, the surface quality of the polished workpiece is effectively improved, and then efficient and precise machining of the workpiece is realized.

A free curved surface precision machining tool for precision-machining a surface to be machined with the lower end in contact therewith by rotation around an axis x. It includes a drum-shaped tool having a rotation axis x orthogonal to the axis z and rotationally driven around the rotation axis x. This drum-shaped tool has a convex machining surface in the form of an arcuate rotary body obtained by rotating an arc of a radius r with the center at the intersection O between the axis z and the rotation axis x around the rotation axis x. The convex machining surface contacts the surface to be machined to precision-machine the latter, while the convex machining surface is rotated around the orthogonal axis x so as to disperse the machining position of the convex machining surface.

The invention provides a flexible grinding device for soft and brittle materials. The flexible grinding device comprises a grinding disc and a workpiece fixing device. A grinding pad is arranged on the grinding disc, and the grinding disc and the grinding pad can rotate; the workpiece fixing device is arranged above the grinding disc and used for clamping a to-be-ground workpiece, and the to-be-ground workpiece is driven by the workpiece fixing device to rotate; the lower end of the to-be-ground workpiece is in contact with the grinding pad and generates relative friction with the grinding pad in the rotating process, so that the grinding effect is achieved; the workpiece fixing device comprises a connecting body, a liquid bag and a clamping mechanism, and the liquid bag is in contact with a to-be-ground workpiece; a vibration rod is fixedly arranged above the connecting body, piezoelectric ceramics are arranged on the vibration rod, and the piezoelectric ceramics vibrate in the radial direction. The high-efficiency and high-quality grinding of soft and brittle materials can be realized, the surface quality of a ground workpiece is improved, the efficient precision machining of the workpiece is further realized, and meanwhile, the high-efficiency and high-quality grinding device is simple in structure, convenient to operate and use and high in practicability.

The invention relates to a cleaning device for precision machining powder of an advanced ceramic green body. The cleaning device comprises a material collecting pipe, a material falling barrel, a material collecting bag, a connecting pipe, a suction device and a motor; the material collecting pipe is connected with a feeding port of the material falling barrel, and the suction port end of the material collecting pipe is arranged on the side of a ceramic green body finishing tool obliquely and fixedly, and can be moved along the tool for suction; the material collecting bag is connected with adischarging port of the material falling barrel, and the suction device is connected with the material falling barrel through the connecting pipe, and can be used for vacuumizing the material fallingbarrel; and the suction device is driven by the motor. According to the cleaning device, real-time mechanical cleaning of powder in precision machining procedures of the advanced ceramic green body can be achieved, and the cleaning efficiency and safety are improved; the precision machining effect of the green body is improved, and reliable auxiliary technical support is provided for precision machining of the advanced ceramic green body so that large ceramic components are produced more efficiently; and meanwhile the cleaning device benefits recycling of ceramic powder.

The invention discloses a ceramic rod grinding method which comprises the following ceramic rod manufacturing steps: step 1, manufacturing of a ceramic rod; step 2, a stage of rough machining of the ceramic rod; step 3, a stage of finish machining of the ceramic rod; and step 4, chemo-mechanical polishing. According to the manufacturing steps of the ceramic rod grinding method, a technical schemefor the efficient precision machining process of a hard rod can be achieved; the high-quality hard ceramic rod which is manufactured by adopting equipment involved in the ceramic rod grinding method through batch machining can reach the roundness of 0.05 micrometers, the ceramic rod diameter variation of 0.10 micrometers and the surface roughness of Ra 5 nm; compared with the efficiency of a conventional free abrasive grinding machining method, the machining efficiency of the ceramic rod grinding method can be improved by 2 times; and the efficient and high-precision grinding machining of a hard precision ball can be preliminarily achieved.

The invention discloses a processing method for grinding a circular ring end surface through a grinding rod with large slenderness ratio and weak rigidity. The processing of the circular ring end surface is divided into three steps of grinding a coaxial hole at the circular ring end surface of a bottom hole, removing the hole wall of the coaxial hole, and finish-machining the circular ring end surface of the bottom hole. In the coaxial hole processing process, the distance Z4 to Z3 between the hole bottom of the coaxial hole and the left end surface of a workpiece is measured through a probe and is differed from the nominal dimension L between the circular ring end surface of the bottom hole on a workpiece drawing and the left end surface of the workpiece; when L-Z4+Z3 is smaller than or equal to 30mum, the hole wall of the coaxial hole is removed, and finally the circular ring end surface of the bottom hole is finish-machined; and the distance between the circular ring end surface ofthe bottom hole and the left end surface of the workpiece is measured through the probe until meeting the tolerance requirement of the drawing dimension, so that grinding processing is accomplished. According to the method provided by the invention, the occurrence of the problem that according to a traditional workpiece self-rotating grinding processing method, the chattering unstability of the grinding rod caused by the functions of axial and radial grinding forces causes fast falling or local crushing of grinding wheel abrasives is avoided, the processing efficiency and the service life of agrinding wheel are improved, the rejection rate is reduced, and automation can be easily realized.

The invention discloses an electrolytic machining method, a cathode for electrolytic machining and an electrolytic machining device. The method comprises the steps that a part serves as an anode, an electrolyte is introduced into an internal structure from a surface port of the part, the electrolyte makes contact with the inner wall of the internal structure for a reaction, then the electrolyte flows out of the other surface port of the part and continues to flow through the cathode arranged at the other surface port, an electrolytic machining loop is formed, and the internal structure of the part is treated; the disclosed cathode is provided with an electrolyte collection container, and the collection container is provided with an electrolyte collection port and an electrolyte outflow port; and the electrolytic machining device comprises the cathode and an electrolyte tank. According to the method, a workpiece is machined and formed on the basis of an oxygen electrode metal electrochemical dissolution principle, the efficient and precise machining problem of internal structure metal parts such as titanium alloy and high-temperature alloy manufactured through laser additive manufacturing is effectively solved, and the metal workpiece internal structure surface high in precision and good in surface quality can be effectively machined.