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1361results about How to "Cutting stability" patented technology

Multi-axis curved surface type numerically-controlled method for machining complicated curved surface part

The invention discloses a multi-axis curved surface type numerically-controlled method for machining a complicated curved surface part. According to the method disclosed by the invention, the axis of a cutter can be arranged according to the directions of longitude and latitude normal lines for forming a curved surface, an inclined angle is adjusted to generate a cutter path, and the machining efficiency and the part surface smoothness can be improved. The numerically-controlled method can be realized by the following technical scheme: a part is fixed in a rotary center of a five-shaft machine tool; a curved surface is reconstructed according to the curvature change, the normal line direction of the curved surface and a machining path; a space change of an axis vector of the cutter is controlled by adjusting the front inclined angle and the side inclined angle of a cutter shaft of a flat-bottom end mill so that the cutter always keeps that a cutter tip participates in curved surface cutting in the five-axis continuous cutting process; a curved surface projection machining manner is adopted in the programming process so that the mill can carry out multi-axis linked milling machining according to the curvature change of the curved surface; the axis of the cutter is similar with a relatively small front inclined angle alpha overlapped to the normal line direction of the cutter path and a side inclined angle is set as 0; the axis of the cutter is kept vertical to the direction of the machining path to implement a five-axis linked machining numerical control procedure.
Owner:四川泛华航空仪表电器有限公司

Construction process of double-wall steel cofferdam for construction of pier bearing platform in main river water of Yellow River

ActiveCN102251530ASolve the water stop problemReasonable designFoundation engineeringDouble wallCofferdam
The invention discloses a construction process of a double-wall steel cofferdam for construction of a pier bearing platform in main river water of the Yellow River. The construction process comprises the following steps of: 1, determining the structure and the size of a cylindrical double-wall steel sleeve box used in the construction of the bearing platform in the water; 2, measuring and paying off; 3, performing cofferdam construction: gradually lowering the cylindrical double-wall steel sleeve box to a preset position by adopting hoisting equipment, and fixing the bottom of the cylindrical double-wall steel sleeve box lowered in place by adopting a supporting fixer; 4, sealing the bottom; 5, constructing drilled piles at the bottom of the bearing platform; 6, gradually pumping water, performing underwater digging, and gradually cutting a steel protecting canister; 7, constructing the bearing platform; and 8, constructing pier columns on the upper part of the bearing platform. The process is reasonable in construction step design, convenient in construction, low in construction cost and short in construction period; and integrated construction of the bearing platform and the drilled piles is realized, meanwhile, the sinking operation of the double-wall steel sleeve box can be simply, conveniently and efficiently finished with high quality, and multiple defects in the construction of the conventional double-wall steel sleeve box cofferdam are overcome.
Owner:中铁二十局集团第二工程有限公司

Torch-flame cutting process for super-thick steel plates

The invention discloses a torch-flame cutting process for super-thick steel plates, which includes steps of utilizing a numerical-control torch-flame cutting machine for torch-flame cutting of the super-thick steel plates, placing a to-be-cut steel plate on the numerical-control torch-flame cutting machine while keeping the surface of the to-be-cut steel plate perpendicular to a cutting torch of the numerical-control torch-flame cutting machine and keeping the distance from the cutting torch to the surfaces of the to-be-cut steel plates ranging from 10mm to 30mm; setting cutting speed, preheating time, preheating oxygen pressure, cutting oxygen pressure and dimethylmethane pressure of the numerical-control torch-flame cutting machine; regulating flame strength of the cutting torch by utilizing the right-angle position formed between the surface of the to-be-cut steel plate and the lateral side thereof as an initial cutting point, enabling the secondary flame to be longer enough to reach the bottom of the to-be-cut steel plate, preheating the initial cutting point for a preset preheating time before initial cutting, and then turning on cutting oxygen, moving the cutting torch forwards when slag flows downwards along edges, and finally increasing moving speed of the cutting torch when the slag is discharged from the bottom until completing the normal cutting operation. The torch-flame cutting process for the super-thick steel plates is capable of guaranteeing quality of cut surfaces, is simple and stable, is safe in use and meets production requirements.
Owner:CITIC HEAVY INDUSTRIES CO LTD

Processing method of ferrous metal super-finishing surface

The invention relates to a processing method of a ferrous metal super-finishing surface, and the processing method is characterized in that: the end of a ferrous metal workpiece is directly cut by a diamond cutter on a precision or super-precision numerical control lathe; an excitation device is arranged to drive the cutter to vibrate ultrasonically, a spray device is arranged and carbon containing cutting fluid is prepared; and in processing, the diamond cutter cuts in the composite state of ultrasonic vibration and the protection of the carbon containing cutting fluid, so that the coupling of the cutter in physical and chemical wear reduction principles is realized, and the wear when the diamond cutter cuts ferrous metal is effectively reduced. According to the processing method of the ferrous metal super-finishing surface, rough cutting, half-precision cutting and final cutting procedures are carried out through an artificial polycrystalline diamond cutter, a chemical vapor deposition (CVD) thick film diamond cutter and a natural monocrystalline diamond cutter, so that the whole process is completed on the same set of equipment; the surface of the workpiece is nitrided before final cutting, so that the wear of the natural diamond cutter is further reduced; the method has good operability, the high-precision and high-efficiency processing with lower cost to the ferrous metal super-finishing surface is realized, and the method can be widely applied to aerospace, optics, mould industry and other fields.
Owner:TSINGHUA UNIV

Numerical control tooth grinder for spiral bevel gear

The invention relates to a numerical control curve-tooth bevel gear grinder, which comprises a lathe bed, and is characterized by also comprising an upright post, a grinding wheel main shaft box, a workpiece main shaft box, an electric turntable, a grinding wheel correcting mechanism and a numerical control system. The lathe bed in the horizontal direction is provided with linear guide rails vertical to each other, the upright post and a bed saddle are arranged on the linear guide rails respectively, and an upright post automatic moving mechanism is arranged between the bottom of the upright post and the lathe bed; one lateral surface of the upright post is provided with the linear guide rail and the grinding wheel main shaft box, and the same side of the upright posts close to the top is provided with a moving mechanism for driving the grinding wheel main shaft box to move; and the bed saddle is provided with the electric turntable which is provided with the workpiece main shaft box on which the grinding wheel correcting mechanism is arranged. The numerical control curve-tooth bevel gear grinder has the advantages that the grinder simplifies the prior mechanical transmission, shortens adjusting time of a machine tool, has compact and reasonable structure, accurate processing with high accuracy, high automation degree to remarkably improve processing efficiency, and has low manufacturing cost to relieve economic burden of enterprises.
Owner:TIANJIN NO 1 MACHINE TOOL WORKS

Pipe fitting pinching mechanism

The invention discloses a pipe fitting pinching mechanism, and belongs to the field of pipe machining conveyance mechanical equipment. The pipe fitting pinching mechanism comprises a translation base, a translation motor, a translation support, a pipe clamping support, a lifting push plate, lifting air cylinders, pipe clamping plates, a pipe bearing plate and a plate clamping mechanism. The translation support is arranged on translation guide rods in a sliding mode in the horizontal direction. The pipe clamping support is vertically arranged at the upper side of a fixed rotating shaft. The lifting push plate is arranged on lifting guide rods in a sliding mode in the vertical direction. Arc-shaped plate push surfaces are symmetrically arranged at the two sides of the lifting push plate correspondingly. The pipe clamping plates are symmetrically arranged at the two sides of the pipe clamping support separately. The pipe bearing plate is horizontally arranged at the upper side of a pipe bearing supporting rod. The plate clamping mechanism is arranged on the pipe clamping support and located at one side of a lifting clamping groove. The pipe fitting pinching mechanism is reasonable in structural design, pipe fittings of various sizes and dimensions can be clamped and fixed firmly, the pipe fittings can be stably rotated and adjusted synchronously in the translation process of the pipe fittings, and the production and use needs are met.
Owner:浙江绿康农产品配送有限公司

Novel jig saw

The invention discloses a novel jig saw which comprises a head and a motor arranged in the head. A first driving wheel in linkage with a motor shaft extension end of the motor is eccentrically hinged with one end of a first connecting rod; and the other end of the first connecting rod is hinged with a first reciprocating rod on which a first saw blade is fixed. The novel jig saw is characterized by further comprising a second driving wheel in linkage with the motor shaft extension end; the second driving wheel is eccentrically hinged with one end of a second connecting rod; and the other end of the second connecting rod is hinged with a second reciprocating rod on which a second saw blade is fixed. The novel jig saw is also provided with a linear limiting mechanism which keeps a certain gap between the first reciprocating rod and the second reciprocating rod and can move linearly; the first saw blade and the second saw blade are respectively clamped on the inner side surfaces close to each other at the lower parts of the first reciprocating rod and the second reciprocating rod; and the linear reciprocating motion of the first saw blade is opposite to the linear reciprocating motion of the second saw blade. As the parts are symmetrically designed, the jig saw operates stably, is easy to operate and has relatively high working efficiency.
Owner:NINGBO LUTZ TOOLS CO LTD
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