92 results about "Abrasive flow machining" patented technology

The invention discloses a special clamp for abrasive flow polishing of a narrow flow passage closed impeller flow passage. The special clamp comprises an upper mold, a lower mold, a floating lock and a gasket support plate, wherein the upper mold and the lower mold form a cylindrical cavity; the inner diameter of the cylindrical cavity is greater than the diameter of the impellers; the gasket support plate is a round disc having the diameter as the same as the diameter of the impellers; the floating lock consists of an upper round disc and a lower round disc and a double-head stud and a bolt which are used for connecting the two round discs; the mounted floating lock can move between the gasket support plate and the lower mold; the impellers are arranged on the gasket support plate, and are fastened by the upper mold and the lower mold; and the upper mold and the lower mold are positioned through seam allowance, and are fixed by the bolts. The clamp for abrasive flow machining of the narrow plow passage closed impellers can be used for fixing the impellers and can guide abrasive materials to flow through the surface of the impeller flow passage, and keep a given pressure so as to grind and polish the internal part of the impeller flow passage, form a circular loop and realize reciprocating flow of the abrasive materials.

The invention discloses a flexible coupling module type blisk abrasive flow machining polishing clamp. The flexible coupling module type blisk abrasive flow machining polishing clamp comprises an upper flow distributing plate, an outer sleeve, a lower flow distributing plate, restraining modules, a center shaft and a locating pin. Each restraining module is composed of restraining sub-modules, wherein the number of the restraining sub-modules is identical with that of blades of the turbine blisk. Gap flow channels are formed between the restraining sub-modules and the blades of the turbine blisk. Each restraining sub-module on the corresponding gap flow channel and the surface of the corresponding blade of the turbine blisk are provided with coupled curved surface shapes. The sections, in the direction perpendicular to the curved surface of the blades, of the gap flow channels are identical and have the same width. In the polishing process, abrasive materials flow into the gap flow channels between the restraining sub-modules and the blades of the turbine blisk along a flow distributing channel of the upper flow distributing plate. Double layers of flow guide plates enable the abrasive materials to be continuous and stable when the abrasive materials enter the gap flow channels. In the abrasive flow machining polishing process, the inner surface of each gap flow channel which the abrasive materials pass through always keeps the same distance away from the surface of the corresponding blade, and the surface quality of the blades is guaranteed to be uniform. The combined clamping manner is adopted by the restraining modules, and turbine blisks of different types and sizes can be polished.

The invention relates to an abrasive flow machining numerical simulation research method based on molecular dynamics. According to the method, numerical simulation researches are carried out on a machining course by taking a single abrasive grain as a tool. Specifically, the method comprises the following steps: (1) carrying out abrasive flow machining course simulation researches on the basis of molecular dynamics; (2) establishing an abrasive micro-cutting molecular dynamic model; (3) discussing the influence of related parameters on energy change in the machining course and analyzing the quality of a machined surface; and (4) exploring the influence of abrasive machining on an abrasive crystal structure at a micro-scale. According to the method disclosed by the invention, by researching and analyzing a single-abrasive micro-cutting process in the abrasive flow machining course by virtue of a molecular dynamics method, atomic displacement in a Newtonian layer of a workpiece during the abrasive micro-cutting process can be calibrated; and the method can be used for achieving molecular dynamic simulation of abrasive grains and pointing out that bond angle of an abrasive grain can be changed in the course of machining the abrasive grains, so as to lay a theoretical foundation for the subsequent researches on the deformation of the abrasive crystal structure in the abrasive flow machining course.

A method and apparatus is presented. A structure having an interior channel is formed using additive manufacturing equipment. A viscous media containing abrasive particles is sent through the interior channel using abrasive flow machining equipment to form a desired surface roughness for the interior channel.

An apparatus and method for abrasive flow machining the orifice (18) of a workpiece (20) by using an abrasive media (15) whereby the apparatus (10) is capable of passing media (15) through the orifice (18) at a predetermined pressure and at a constant flow rate. In the alternative, the apparatus (10) is capable of passing media (15) through the orifice (18) at a fixed flow rate by using variable pressure upon the media (15) through the orifice (18).

A method of treating an interior surface of a workpiece (5); said method comprising providing a workpiece (5) having an interior passage (11) defined at least partly by said interior surface to be treated, said passage (11) having an inlet section and an outlet section; providing in said interior passage (11) at least one deflecting object (6), said deflecting object (6) having an outer surface, whereby a space is formed between said outer surface of said at least one deflecting object (6) and said interior surface of said workpiece (5); providing an abrasive fluid (3) in said space, such that said space is substantially filled with said abrasive fluid (3); and effecting flow of said abrasive medium (3) through said interior passage (11) from said inlet portion to said outlet portion.

The present invention incorporates at least one thermoplastic or elastomeric polymer in abrasive flow machining media either as the sole or as one of the polymeric constituents. The presence of thermoplastic polymer imparts a greater elastomer characteristic (elasticity, compression resistance, increased relaxation times) as contrasted with traditional media. Enhanced elastomeric characteristics enable more uniform abrasive machining. In a particularly preferred embodiment, silicone- or polyorganosiloxane-based medium contains elastic silicone rubber particles dispersed therethrough to achieve increased relaxation times comparable to those attainable with the inclusion of a thermoplastic polymer.

The invention relates to the technical field of fluid and solid two-phase fluid and abrasive material flow machining in mechanical engineering and discloses a two-phase fluid abrasive particle sliding speed measuring device for viscoelastic fluid abrasive particles. The measuring device comprises a rack, a material pushing cylinder installed on the rack, a material pushing piston installed on the material pushing cylinder, a charging barrel installed on one side of the material pushing cylinder, a hydraulic cylinder providing power for the material pushing piston, material extruding round pipes fixed to the rack and located at the bottom of the material pushing cylinder, a movable workbench installed on the rack and located below the material extruding round pipes, first motors pushing the movable workbench to move up and down, a chuck installed on the movable workbench and used for clamping a cylindrical sample, and a second motor driving the chuck to rotate.

A method and apparatus are disclosed for abrading the inner surface at the intersection region of a branch outlet with the wall of a body having a passageway. Using abrasive flow machining, it is possible to abrade the intersection region to provide a smooth transition between the wall and the branch outlet.

A tool for use during the abrasive flow polishing of an airfoil cluster in an abrasive flow machine is described. The tool may comprise a body and prongs extending from the body. Each prong of the tool may be configured to insert between an adjacent pair of airfoils of the airfoil cluster to create at least one channel therebetween. The channel may allow the flow of an abrasive media therethrough.

The invention discloses a non-traditional machining method of a RV cycloid gear. The method comprises following steps: metal round blank material is selected as raw material and is subjected to normalizing and low-speed wire cutting and slicing; a via hole of the workpiece is processed using a cycloid as the reference; the workpiece is subjected to stress relief annealing and quenching; then the workpiece is subjected to drawing temper, finishing and abrasive flow polishing. According to the method of the invention, low-speed wire cutting is adopted to process gear cycloid and abrasive flow is adopted to polish cycloid gears; after processing, the surface roughness of the cycloid gears is low and the dimensional accuracy is high. Compared to the traditional rough turning-fine turning-gear hobbing-gear shaving-gear grinding process, the production efficiency is significantly improved, and the high cost of high accuracy machine tools required in rough turning-fine turning-gear hobbing-gear shaving-gear grinding process; the method has good production prospect.

The invention provides an abrasive flow deburring precision machining device. The abrasive flow deburring precision machining device comprises an upper abrasive flow shell, a lower abrasive flow shell, a workpiece clamping tool, an upper abrasive flow oscillating piston, a lower abrasive flow oscillating piston, an upper oscillator, a lower oscillator and an abrasive flow feeder. According to the abrasive flow deburring precision machining device, an airtight space is formed among the upper abrasive flow shell, the workpiece clamping tool and the lower abrasive flow shell; flowing of an abrasive flow is achieved through the circulating flowing performance achieved through the abrasive flow feeder by means of the upper oscillator and the lower oscillator; the upper oscillator and the lower oscillator oscillate in opposite directions at the same frequency, in this way, the movement intensity and the movement speed of the abrasive flow are increased, and the deburring capacity is improved; meanwhile, the workpiece clamping tool is only used for being abutted against and fixing a workpiece, and the fixing method is simple and reliable; various special-shaped parts can be clamped; machining efficiency can be guaranteed; in addition, impacting deburring machining of the workpiece by the abrasive flow is not affected. The abrasive flow deburring precision machining device is simple in structure and convenient to use, and abrasive flow machining cost is greatly reduced.

The invention discloses an abrasive flow flexible clamp. The abrasive flow flexible clamp comprises an upper end cover, a cylinder sleeve and a lower end cover; the cylinder sleeve is an annular cylinder, and the upper end cover and the lower end cover are arranged at the upper end and the lower end of the cylinder sleeve correspondingly; a to-be-machined part is located in the cylinder sleeve andarranged on the lower end cover, material passing holes are formed in the upper end cover and the lower end cover, and the material passing hole in the lower end cover is in communication with a to-be-machined hole system in the to-be-machined part; and when abrasive flow machining is conducted on the to-be-machined part, abrasive is fed into the to-be-machined hole system of the part from a lower fluid abrasive cylinder through the material passing hole in the lower end cover, after the abrasive flows out of the to-be-machined hole system and is led out of an upper fluid abrasive cylinder through the material passing hole in the upper end cover, and after the abrasive in the lower fluid abrasive cylinder flows out completely, the abrasive collected in the upper fluid abrasive cylinder isreversely guided so as to machine the to-be-machined hole system, and the process is repeated. According to the abrasive flow flexible clamp, a pump body inclined hole can be rapidly extruded, protruding burrs on the edges of crossed holes are removed, the pump body machining quality is improved, and the pump body cleanliness requirement is met.

The invention discloses a size-variable clamp for abrasive flow machining of a valve block through hole. The size-variable clamp comprises a bottom plate, a cover plate, side plates, angle plates, a supporting plate and a variable washer. The bottom plate comprises a center threaded hole, four positioning holes, four trapezoidal sliding grooves and four fixed threaded rods; the cover plate comprises a center flowing channel and four through holes; each side plate comprises two flowing channel through holes and a trapezoidal sliding rail; each angle plate comprises two sliding grooves matched with the corresponding side plates, four semi-circular holes matched with the flowing channel through holes of the corresponding side plates, an internal partition plate and an external fastening auxiliary plate; the supporting plate at the bottom comprises a threaded rod, a bearing and four positioning rods; and the variable washer is formed by four movable angle sliding blocks in a matched mode.The size-variable clamp is designed specific to abrasive flow machining of the valve block through hole, the innovation point of the size-variable clamp lies in that the size of the clamp can be changed, through hole parts inside regular hexahedrons of different sizes can be machined, mounting is convenient, the machining efficiency is high, and the roughness of an inner hole is significantly reduced.

A combined fixture for grinding material flow processing for cross-section-variable special-shaped channels is characterized in that the combined fixture comprises a workpiece exterior fixture and aninner-hole guide mandrel; the workpiece exterior fixture comprises a fixing and supporting block (1), an outer fixture base (2), an upper cover support ring (3), a workpiece base (4), a base gasket (5), an upper cover plate (6) and an upper fixture cover (7); the outer fixture base (2) is fixed to a workbench of a grinding material flow processing machine tool; the workpiece base (4) is mounted onthe outer fixture base (2) through the fixing and supporting block (1) to enable a grinding material channel to be formed between the outer fixture base (2) and the workpiece base (4); a workpiece isfixed to the workpiece base (4) through a limiting groove; the upper cover support ring (3) is mounted between the outer fixture base (2) and the upper fixture cover (7); the inner-hole guide mandrel(8) is located at the center of the workpiece and fixed to the workpiece base (4). The combined fixture has the advantages that the reasonable fixture is provided for reducing surface roughness of the special-shaped channels by grinding material flows, and has a reasonable design, a simple structure and an obvious effect.

The invention relates to a machining fixture of an irregularly-shaped straight slot and a machining method. The machining method includes the steps that firstly a large part of allowances of the irregularly-shaped straight slot are removed by using a wire-cut machining method, and the machining allowance of the irregularly-shaped straight slot is reserved to be 0.01mm to 0.05 mm; parts of the irregularly-shaped straight slot are clamped on the fixture; once again the parts of the irregularly-shaped straight slot and the fixture are integrally mounted on an abrasive flow machine tool, the rest of the machining allowances of the irregularly-shaped straight slot are removed by using an abrasive flow machining mode; and finally the parts of the irregularly-shaped straight slot are dismounted from the fixture and the abrasive flow machine tool, the parts of the irregularly-shaped straight slot are inspected and put in storage after being washed. By using the technical scheme provided by the machining method, the machining method by combining fast wire cut with abrasive flow grinding machining together is used, firstly the large part of machining allowances are removed through fast wire cut , rough machining and forming are conducted, and then forming is completed through the abrasive medium grinding mode, so that the roughness of the surface around the irregularly-shaped straight slot is improved greatly, the machining cost is reduced, and the machining accuracy and the machining quality are improved.

The invention discloses abrasive flow machining equipment for a cylinder-shaped workpiece. The abrasive flow machining equipment comprises an equipment assembly and a working box arranged in the equipment assembly, and the working box is internally provided with a first extrusion working cavity and a second extrusion working cavity arranged below the first extrusion working cavity. The abrasive flow machining equipment is mainly used for the cylinder-shaped workpiece, the effect that the inner wall and the outer wall of the cylinder-shaped workpiece are polished at the same time can be achieved through abrasive flow, after polishing is completed, the redundant abrasive flow is extruded into one cavity for secondary utilization, after the abrasive flow is extruded, a water pump is lifted tothe inner wall of the cylinder-shaped workpiece to flush the interior of the cylinder-shaped workpiece, and meanwhile part of water flows outside the outer side of the cylinder-shaped workpiece through a gap, meanwhile a whole polishing cavity shakes, the inner wall, the outer wall and the gap of the cylinder-shaped workpiece are effectively cleaned, and the problems that when abrasives are extruded out of a workpiece, part of the abrasives remain in the gap, the cylinder-shaped workpiece needs to be taken out to for removing of the abrasives, procedures are complex, meanwhile, traditional abrasive flow polishing cannot achieve simultaneous polishing of the inside and the outside, and the polishing efficiency is low are solved.

The invention discloses a clamp for polishing of auto-rotation abrasive flow of a rotator workpiece and a design method thereof. The clamp comprises a clamp base and moulds, wherein the moulds are uniformly distributed in the clamp base in a layered manner, both an upper cover plate and a lower cover plate of the clamp base are provided with a plurality of runner through holes, the clamp base is used for positioning the moulds and supporting pressure of an external machine tool, each mould comprises an upper runner plate and a lower runner plate which are oppositely fastened to form a runner for storing a workpiece to be machined, and the upper runner plates and the lower runner plates are made of materials with low hardness. An untight clamping mode is proposed, movement of the workpiece is limited by setting sizes of the runners of the moulds and inclination angles of wall surfaces, and the clamp solves the problem that a machined workpiece needing complete polishing has no clamping points. Compared with a non-eccentric rotation abrasive flow machining method, the design method has the advantages that surface machining uniformity is improved, and surface roughness and production cost are reduced.

The invention discloses a clamp for hydraulic cylinder abrasive flow machining. The clamp comprises a base, a bottom plate, a convex ball base, a rotating base, a hydraulic cylinder clamping base, a spiral disc, a rotation rod, an upper fixed base and an upper cover base; when abrasive flow finish machining is carried out a hydraulic cylinder, the hydraulic cylinder can be rapidly clamped, duringclamping, a connecting pin only needs to be detached, the upper fixed base is taken down, an outer lock sleeve of an axial connecting assembly is drawn out, a first connecting clamping ring and a second connecting clamping ring are separated, the upper cover base and the hydraulic cylinder clamping base are separated, the hydraulic cylinder is fixed into the hydraulic cylinder clamping base, the axial connecting assembly is mounted, the upper fixed base is positioned, the connecting pin is connected, abrasive flow media are led in, the rotating rod and the rotating base are started, and rotatein the opposite directions, the abrasive flow media can achieve impact machining on the surface of the hydraulic cylinder under rotation of the spiral disc, machining efficiency is high, and the finish machining of the surface of the hydraulic cylinder can be comprehensively achieved.

The invention relates to a low-cost and high-efficiency machining method for cycloid gears. The method is characterized by comprising the following process steps that (1) round metal billets are selected as raw materials; (2) the round billets are subjected to normalizing treatment; (3) the round billets are subjected to gear broaching; (4) the billets are subjected to phosphating and saponifying treatment in sequence; (5) the billets are subjected to oil film lubrication and extrusion machining; (6) annealing is carried out; (7) the step (4) and (5) are repeated; (8) auxiliary holes of the billets are machined with a cycloid as the benchmark; (9) quenching treatment is carried out; (10) tempering treatment is carried out; (11) workpieces are subjected to finishing machining; and (12) polishing treatment is carried out. According to the method, the cycloid gears are subjected to extrusion machining for two times through the oil film lubrication and extrusion technology; the cycloid gears are subjected to polishing treatment through abrasive flow machining technology; the machined cycloid gears are low in surface roughness and high in dimensional accuracy; and the machining efficiency of the cycloid gears is remarkably improved, and the machining cost is reduced.