65results about How to "Prevent overcut" patented technology

The invention provides a piling machine, which comprises drilling equipment for drilling, punching equipment for punching and a drilling turnplate device arranged on a chassis, wherein the drilling turnplate device comprises a drilling turnplate which is driven by hydraulic pressure and is expandable; a punching transmission device comprises a cross beam arranged on a tower and a pulley block arranged on the cross beam; the cross beam is divided into a front movable cross beam and a rear fixed cross beam; the front movable cross beam is hinged with the rear fixed cross beam and can rotate around the point of intersection between the front movable cross beam and the rear fixed cross beam; the pulley block comprises a front guide pulley arranged on the front movable cross beam and a rear guide pulley arranged on the rear fixed cross beam; and the punching equipment comprises a hydraulic jacking device for jacking a punching steel rope in the punching transmission device. The piling machine realizes drilling and punching functions, improves working efficiency and shortens construction period.

The present invention discloses an inter-harmonics control method in a wind power collection station. The method comprises that an inter-harmonic signal extraction module carries out spectral analysis on a tie line current from the wind power collection station to a main network, calculates frequency fc of a harmonic component with the maximum amplitude, and extracts inter-harmonic signals in a tie line voltage and each wind power farm current; a wind power farm that is allowed to be cut in the collection station is determined according to the tie line inter-harmonic current, the inter-harmonic voltage, and the wind power farm inter-harmonic current; absolute values of difference values between the fc and a set of characteristic frequencies are calculated, and a minimum value dfmin among the absolute values is solved; and a sub-round and level-to-level cutting module cuts each wind power farm that is allowed to be cut in a series of rounds and level by level according to the tie line inter-harmonic current, the dfmin, and the wind power farm inter-harmonic current. According to the method disclosed by the present invention, the tie line between the wind power collection station and the main network, and each wind power farm can be monitored simultaneously, the relatively large inter-harmonic current existing in the power grid can be online monitored in real time, and whether there is an inter-harmonic generation source in the wind power collection station can be online determined in real time.

The invention discloses a method for smoothing a machining route of a five-axle machining cutter. The method comprises the steps of obtaining a discrete attitude vector and a position vector of a five-axle machining cutter on a unit spherical surface; obtaining a transformation quaternion according to the discrete attitude vector; carrying out parameter interpolation optimization of the transformation quaternion in the quaternion space by the least square method so as to obtain optimized unit quaternion; obtaining the optimized discrete attitude vector that is located on the unit spherical surface according to the optimized unit quaternion; carrying out the interpolation optimization of the position vector by adopting the least square method; obtaining the smooth machining route by the interpolation-optimized position vector and the optimized discrete attitude vector; and inputting the smooth machining route into a five-axle numerically-controlled machine tool so as to realize the machining of workpieces. According to The method disclosed by the invention, the interpolation of the discrete attitude points on the unit spherical surface can be conducted to form a continuous smooth trace, and the cutting is conducted practically by the smooth trace to enhance machining precision.

The invention discloses an optimizing method for a five-axis numerical control machining singular region cutter location point.A cutter shaft destination vector in a neighbourhood of the cutter shaft destination vector is optimized to obtain the optimized cutter shaft vector, so that the included angle theta between the projects, on a plane with the polar axis as a normal vector, of a cutter shaft start vector and the cutter shaft destination vector is the smallest to reduce the motion quantity of a first rotating shaft of a machine tool, and the cutter track in a singular region is optimized.By the adoption of the optimizing method, reliability of machining accuracy can be improved, program calculation is simple, the machining time is greatly shortened, and machining efficiency is improved.

The invention relates to the technical field of plate cutting, in particular to a method for cutting a hard plate with a flat edge, which uses a flat edge knife to cut an edge at a corner, wherein the flat edge of the flat edge knife is aligned with a required cut piece, The convex edge is aligned with the unnecessary pieces, and the vertical rake face is aligned with the cutting corner to start cutting; use the flat edge to cut the other side at the corner, wherein the flat edge is aligned with the required pieces , the convex edge is aligned with the unnecessary pieces, and the vertical rake face is aligned with the cutting corner to start cutting; repeat the above steps until all the corners are cut, and use the flat blade cutter to cut the middle straight section Until all the straight sections are cut, wherein, the flat edge of the flat edge cutter is aligned with the required pieces, and the convex edge is aligned with the unnecessary pieces. This cutting method will not squeeze the required pieces, avoid changes in the internal structure and properties of the material, and avoid white edges. The straight edge knife and the flat edge reverse knife realize the cutting at the corners and avoid overcutting.

The invention provides a method for machining a variable cross-section dovetail blind groove of a composite material, and belongs to the technical field of machining. The method includes the steps that a rough machining tool, a semi-finishing tool and an insert block are manufactured; the rough machining tool is used for removing the large allowance to form a rectangular cross-section groove; the semi-finishing tool is used for conducting transverse cutting feed from the outer side of the cross section of the rectangular cross-section groove, the tangent line of the maximal turning circle of the tool is located on the groove bottom face contour line of the variable cross-section dovetail blind groove, the allowances of the blind end face and the two side faces of the rectangular cross-section groove are removed, and accordingly a variable cross-section dovetail blind groove workblank with the allowance being reserved at the blind end included angle position is formed; and the insert block is embedded into the variable cross-section dovetail blind groove workblank, the allowance at the blind end included angle position of the variable cross-section dovetail blind groove is removed and a workpiece with the variable cross-section dovetail blind groove can be obtained. By the adoption of the machining method provided by the invention, overcut of the blind end is avoided; the tool durability is effectively improved, and production cost is reduced; and corner chipping happening in the machining process of the workpiece dovetail groove is prevented.

The invention discloses a processing method for avoiding cutter interference. The processing method is used for developing and processing a low-pressure turbine case weld assembly and comprises the following steps: at first, calculating a proper transformation angle of the taper slot of a part and measuring the deformation of the part to ensure that the allowance is to be processed; then, adoptingan end mill to carry out layered rough mill processing, and according to the processing parameters of the part, reserving 0.2mm allowance for the single side of finish machining; and finally, according to the specific requirements of the taper slot, selecting a proper end mill to carry out finish-milling processing by adopting a correct angle to ensure related size requirements. The processing method effectively ensures the processing quality of the part and effectively solves the problems about cutter interference, low processing efficiency and not-in-place processing caused by part deformation to ensure the processing quality of the part.

The invention discloses an electric remover for fractured pipe joints, which comprises a supporting seat, tension devices, a cutting device, a feed regulation device, a driving device and a tail stand, wherein the tree groups of tension devices fix the supporting seat on a pipe connector in an inner-bracing tensioning manner; radial feed regulation and circumferential rotation regulation of saw blades in the cutting device are realized through the feed regulation device; the driving device drives the saw blades to perform reciprocating motion so as to cut a fractured pipe joint. According to the electric remover for the fractured pipe joints, the manner of cutting before removing is adopted, so that the damage to the inner thread of an original pipe joint is extremely low, and damage caused by repair is avoided; moreover, the motor is adopted for driving the saw blades to perform reciprocating cutting, which saves both time and labor and realizes rapid removing and repairing of the fractured pipe joint; besides, the feed regulation device can realize feed control and regulation of the saw blades, to further determine the cutting position and depth and avoid over cutting, therefore the electric remover for the fractured pipe joints has the characteristics of being compact in structure, simple and rapid in operation and control, and capable of easily removing the fracture pipe connector and the like.