134results about How to "Improve surface integrity" patented technology

A method and apparatus for improving the surface finish and/or surface integrity of a workpiece formed or shaped with a tool increase the surface hardness of the workpiece during forming or shaping of the workpiece. A method and apparatus for forming or shaping a workpiece also increase the surface hardness of the workpiece during forming or shaping of the workpiece with a tool, as do a method and apparatus for manufacturing a finished part or product from a workpiece. In some embodiments, an expanding jet of cryogen may be jetted to a surface of a workpiece and a tool from a nozzle, wherein the cryogen is at least partially separated into a condensed phase portion and a vapor portion within a downstream portion of the nozzle.

The invention provides a low-damage processing method of film holes in a single crystal high-pressure-turbine hollow blade of an aircraft engine. The low-damage processing method comprises the following steps: wiping the surface of the blade through degreasing cotton with absolute alcohol; transferring into a drying box to dry; arranging a clamp on a machine table, and aligning; assembling the dried blade on the clamp and locking; presetting scanning system parameters; scanning the blade; saving axis moving coordinate value of each hole to be processed under an automatically-generated machine coordinate system as a *.xls file; importing and generating a hole position file; performing compensative correction on the deviation value of a focus position of the hole to be processed; and setting the optimized laser processing technological parameters through a main processing interface. With the adoption of the low-damage processing method, the processed hole is outstanding in quality; a remelting layer, microcacks and recrystallization can be avoided after the single crystal material is processed, so that subsequent processing can be saved, and as a result, the fatigue life and the processing cycle of the blade can be prolonged and improved; the ablation threshold of the single crystal material can be effectively reduced; the recrystallization of the single crystal material can be avoided.

The invention relates to a controllable and high-precision experimental device for researching a grinding mechanism. The experimental device is characterized in that structures on a base body are distributed in a manner of forming a 120-degree mutual difference; an upper T-shaped slide block and a lower T-shaped slide block are relatively arranged in a slide groove of the base body; a diamond tool is in precise clearance fit with the lower T-shaped slide block; a round-mouth clamp is arranged on the base body and is adjacent to the upper T-shaped slide block; an axial spiral micrometer dial (with the resolution ratio of 1 micron) is arranged above the upper T-shaped slide block and is matched with the round-mouth clamp; three radial spiral micrometer dials (with the resolution ratio of 10 microns) are distributed on the base body in the manner of forming the 120-degree mutual difference. A new thought for researching the grinding mechanism is proposed by a single abrasive particle, double abrasive particles and multiple abrasive particles in an all-directional manner based on controllable and high-precision properties of the device; the device is particularly used for researching an influence rule on a surface forming mechanism and a material removing mechanism by different axial distances and radial distances between the adjacent abrasive particles. The controllable and high-precision experimental device for researching the grinding mechanism is simple in structure, convenient to operate, strong in practicability and high in testing precision, and a researching method is novel and unique.

The invention discloses an electrochemical deburring processing method for turbine disc mortises, which comprises the following steps of: positioning and clamping parts of a processed turbine disc (10) on a clamp; connecting the turbine disc (10) with the positive pole of a power supply (12), and connecting a stationary cathode (4) with the negative pole of the power supply (12); feeding flowing electrolyte between a mortise of the turbine disc (10) and the stationary cathode (4), switching on the power supply so as to begin to carry out electrochemical deburring processing, and controlling the corresponding processing time; and switching off the power supply, turning over the turbine disc (10), and repeating the steps so as to process the other side of the turbine disc (10), wherein in the process of processing, requirements on the processing voltage, the processing current, the electrolyte compositions, the electrolyte concentration, the electrolyte pressure P, the electrolyte temperature T, the processing clearance delta and the processing time are required. The clamp for positioning and clamping parts of the processed turbine disc (10) is specifically a part of a special device for electrochemical deburring processing of turbine disc mortises. The method disclosed by the invention is high in processing efficiency, good in processing effect and low in cost, and has great economic values.

The invention discloses a laser and electrolytic combined machining method. The method at least comprises the following steps that a tool electrode and a workpiece to be machined are connected with the negative electrode and the positive electrode of a power supply correspondingly; lasers and an electrolyte are coupled and transmitted to a machining area of the workpiece to be machined through thetool electrode; and laser and electrolytic combined machining is carried out after the power supply is switched on, and the tool electrode is fed to the workpiece to be machined so as to obtain a target machining structure. Meanwhile, the invention provides a laser and electrolytic combined machining device. The method and device are beneficial to high-efficiency machining of large-depth-to-diameter-ratio micro-structures such as deep-small holes with good surface quality and high precision.

The invention relates to a technique and a method for the finishing processing of gears, in particular to the lapping processing of hypoid gears and spiral bevel gears which have complicated tooth shapes and hard tooth surfaces. The lapping processing method comprises the steps as follows: (1) a pair of gears that need going through lapping processing and comprise a driving gear and a driven gear are assembled together in a way of meshing transmission, the driven gear is driven by the driving gear to carry out rotation movement; (2) preset brake torque is applied on the driven gear; (3) high frequency vibration is applied on the driving gear and/or the driven gear. Highly efficient but low cost lapping processing can be carried out by the method to various gears with the hard tooth surfaces, particularly small modulus gears so as to improve the meshing precision of the gears and reduce vibration and noise in transmission.

A preparation method for yttrium gadolinium europium oxide red fluorescent powder applicable to a 3D PDP (Plasma Display Panel) comprises the steps as follows: a rare earth oxalate coprecipitation body is prepared by adopting a coprecipitation method, rare earth metal oxide is balanced and dissolved in nitric acid or chlorhydric acid to form a rare earth metal salt solution; an oxalic acid solution or a carbonate solution is prepared and added into the rare earth metal salt solution to obtain rare earth metal oxalate or a carbonate precipitate; the carbonate precipitate is filtered and isolated, dried and burned to obtain a rare earth oxide coprecipitation body; the coprecipitation body is oxidized and burned to form a yttrium gadolinium europium oxide red fluorescent powder burned body; the rare earth oxide coprecipitation body is added with a cosolvent and is loaded in an aluminum oxide crucible and is burned under high temperature in an oxidizing furnace; after burned, the rare earth oxide coprecipitation body is shattered after burning to obtain a yttrium gadolinium europium finished product; and finally, the yttrium gadolinium europium oxide red fluorescent powder is obtained according to a downstream treatment process. The fluorescent powder prepared according to the method has the advantages of high lighting brightness, good color purity, complete crystal morphology, small powder center particle size, simple manufacturing method and low production cost, and is suitable for industrial production.

A microchip with capillaries and method for making same is described. A sacrificial material fills microchannels formed in a polymeric substrate, the filled microchannels are covered by a top cover to form filed capillaries, and the sacrificial material is removed to form the microcapillaries. The sacrificial material fills the microchannels as a liquid whereupon it becomes solid in the microchannels, and is liquefied after the top cover is applied and affixed to remove the sacrificial material. The top cover may be solvent sealed on the substrate and of the same or different material as the substrate. The top cover may also be an in situ applied semipermeable membrane.

The invention discloses a bamboo ceramic grinding wheel, a preparation method and application thereof. The bamboo ceramic grinding wheel is prepared by obtaining a blank grinding wheel by the following raw materials through mixing, mold feeding, hot press molding and stripping, and roasting the blank grinding wheel; and the raw materials comprise 20 to 30 percent of phenolic resin, 20 to 30 percent of abrasive particles, and 40 to 60 percent of bamboo charcoal powder according to the mass ratio. The bamboo ceramic grinding wheel is used for ELID grinding, and can ensure that the processed surface has better quality. Compared with the prior art, the invention introduces bamboo charcoal into the raw materials; the bamboo charcoal has rich resources and is environment-friendly; and the bamboo charcoal contributes to the grinding due to the fact that the bamboo charcoal has a microporous structure. The grinding wheel has simple preparation; and the bamboo ceramic grinding wheel ensures that processed surfaces have extremely high surface integrity and cleanliness, has high processing efficiency, can process hard-to-cut materials such as cohesive materials, soft materials and the like, provides a new way for grinding processing, and is environment-friendly and pollution-free.

The invention provides a self-adaption sorting system and method based on computer vision and machine learning. The system is composed of an article classification decision making module, an article information estimating module, a base, a camera, a variable-force suction cup, a flexible mechanical gripper and touch sensors. The system is simple in structure, low in manufacturing cost, stable andreliable in working, good in universality and interchangeability and suitable for multiple working environments. By arranging the variable-force suction cup and the flexible mechanical gripper, the self-adaption sorting system is suitable for fruit self-adaption sorting grading and other multiple production occasions and has the high application value.

The invention discloses a grinding tool with high tangential grinding force and low normal grinding force, and belongs to the technical field of efficient and precise grinding of materials difficult to machine. In order to solve the problems that in traditional grinding machining, the high tangential grinding force and the low normal grinding force cause low material removal rate, grinding tool and workpiece damage and deformation, grinding vibration, grinding wheel blockage, poor workpiece surface integrity, frequent grinding burning and the like, the novel grinding tool is provided; and a similar body armor principle is used, abrasive particles generate a constellation effect under impulse loads, the tangential grinding force instantly increases, and the normal grinding force instantly decreases. The novel grinding tool is composed of three parts including a matching ring, a base ring and an abrasive material layer with the abrasive particle constellation effect. The abrasive material layer is bonded to the base ring through a heat bonding method, the base ring is assembled to the matching ring, and therefore the novel high-precision high-self-sharpening grinding tool is manufactured. According to the grinding tool, high-efficiency, high-precision and high-surface-integrity grinding machining of the difficult-to-machine materials such as crisp and hard materials or aerospace composite materials can be achieved with the high tangential grinding force and the low normal grinding force.

The invention discloses a machining method for an aluminum alloy turbine blade of an aero-engine, and belongs to the technical field of machining for turbine blades of aero-engines. The machining method comprises the following steps: casting the aluminum alloy turbine blade, carrying out film hole machining through a machining method of ultrafast laser annular cutting and spiral scanning, and removing a remelted layer through abrasive particle flow machining and a melted layer removal solution. According to the machining method disclosed by the invention, the film hole machining is carried outthrough the machining method of ultrafast laser annular cutting and spiral scanning, so that the heat effect can be greatly reduced and the surface integrity is improved, the machined film hole has few burrs, grooves and micro-cracks, and the maximum thickness of the remelted layer is not greater than 25[mu]m. Abrasive particles uniformly grind the surface or the corners of a channel under a pressure effect, so that allowance can be removed, the effects of deburring, chamfering and polishing can also be acted, the remelted layer can also be effectively reduced, a hole diameter increment is controlled to be 0.02mm to 0.04mm, and the remelted layer and the micro-cracks can be effectively controlled. The remelted layer is further removed through the remelted layer removal solution, so that no remelted layer residue at the inlet-outlet of the film hole can be achieved.

The invention discloses a laser processing method for air film holes of a high-pressure turbine guide blade, and belongs to the field of aviation engine manufacturing. Through a method of automatic programming combined with manual animation teaching programming, the surface of a part is dotted using a theoretical coordinate value, teaching and recording back of a processing program is completed through manual animation, the influence of the casting surface difference of the turbine blade and rotating shaft motion errors of a machine tool on the air film hole location is reduced, and the location degrees of the air film holes of the high-pressure turbine hollow blade are guaranteed.

The invention discloses a blade surface roll-polishing finishing method adopting a distributed protection measure, and belongs to the technical field of machine part surface finishing. The method is characterized in that a blade and a blade basin protection device or blade back protection device are fixed to a fixture at a certain space angle, and the fixture is connected to a spindle; in the machining process, the spindle swings around the axis of the spindle, and the blade is machined in a work bin which contains machining media such as roll-polishing blocks and polishing liquid and rotates around the axis of the work bin. By means of the method, the blade finishing efficiency and uniformity can be effectively improved, the blade root machining effect can be improved, intake and exhaust sides can be prevented from being excessively polished, deformation of the blade in the machining process can be effectively reduced, and the blade can be protected.

The invention discloses a size correcting method for aeroengine high-temperature alloy disc shaft abrasion, in particular to a thermal spraying size correcting coating technology for an aeroengine nickel-base alloy disc shaft part. The method comprises the specific steps that (1) before a coating is sprayed, the part is subjected to oil removing treatment; (2) the non-coating area of the part is protected; (3) the part is subjected to sand blowing treatment; (4) ultrasonic spraying of a NiCrFeMo coating is carried out on an area after sand blowing; and (5) the sprayed coating is subjected to machining, so that the surface roughness of the coating is consistent with the surface roughness of the part. The bonding strength of the size correcting coating prepared by the method and the base alloy is greater than 69 MPa, the porosity of the size correcting coating is less than 1%, the oxygen content is less than 0.5%, and the hardness is HV0.3435.

The invention provides a machining method of a remelted-layer removed gas film hole for an aero-engine turbine blade, and belongs to the technical field of aero-engine turbine blade machining. The machining method comprises the steps that a turbine blade composite cooling structure is designed, gas film hole machining is conducted through an ultrafast laser circumferential cutting and spiral scanning machining method, abrasive flow machining is conducted, and a remelted layer is removed through a remelted layer removal solution. According to the machining method of the remelted-layer removed gas film hole for the aero-engine turbine blade, the ultrafast laser circumferential cutting and spiral scanning machining method is adopted for gas film hole machining, the thermal effect can be greatly reduced, the surface integrity is improved, the machined gas film hole is few in burr, groove and microcrack, and the maximum thickness of the remelted layer is not greater than 25 [mu]m; abrasiveparticles evenly conduct grinding on the surface or a corner of a channel under action of pressure, not only can the allowance be removed, but also the effects of burr removing, chamfering and finishing are achieved, the remelted layer can also be effectively reduced, the aperture increment is controlled to be 0.02 mm-0.04 mm, and the remelted layer and microcracks can be effectively controlled; and the remelted layer is further removed by adopting the remelted layer removal solution, and the effect that no remelted layer residual occurs in an inlet and an outlet of the gas film hole can be achieved.

A blade milling-polishing integrated molding method comprises the following steps: step 1, clamping and fixing a fan blade through a clamp I, carrying out milling processing, measuring the fan blade by utilizing a measuring tool after the milling processing is finished, and recording the widths of size out-of-tolerance areas on air inlet edges and air outlet edges; step 2, polishing and partitioning the fan blade according to the measuring results obtained in step 1 and the structure of the fan blade; step 3, carrying out programming and selecting polishing parameters, setting the polishing step pitch, and carrying out polishing track simulation by utilizing motion simulation software; and step 4, fixing the fan blade by utilizing a clamp II, precisely polishing all areas of the fan bladein a force control manner, and effectively removing knife marks and knife vibration characteristics by adjusting the use sequence of polishing tools and abrasive grains. Consequently, the overall processing efficiency can be effectively improved and the overall processing cost can be reduced. Furthermore, the final fan blade processing quality can be guaranteed and the surface roughness grade canbe improved.

The invention relates to an auxiliary cold extrusion machining device with large diameter and inner thread based on an electromagnetic vibration exciter. The auxiliary cold extrusion machining device is characterized by comprising a base (4), a fixing plate (7), a torsional vibration plate (3) and an electromagnetic vibration exciter (5), wherein the base (4) is arranged on a machine tool slide carriage (8); the fixing plate (7) is arranged on the base (4) and equipped with an adjustable length to the machine tool slide carriage (8); one end of the fixing plate (7), which is far away from an extrusion tap fixture (1), is provided with a stretching screw (6); the fixing plate is also provided with at least one guide slot (9); the torsional vibration plate (3) is arranged on the fixing plate (7) through a connection bolt (10) which has a guide function and penetrates through the guide slot (9) on the fixing plate (7); one end of the torsional vibration plate (3) abuts against a torsional vibration rod (2) arranged on the extrusion tap fixture (1), and the other end abuts against the stretching screw (6); and the electromagnetic vibration exciter is fixedly arranged on the trosional vibration plate (3) and drives the torsional vibration plate (3) to vibrate synchronously. The invention has the advantages of simple structure, flexible operation and convenient realization and is beneficial to improving processing quality, prolonging the service life of cutters and reducing production cost.