364 results about "Rooted tooth" patented technology

The invention discloses a quenching and tempering method in tooth punching process of a gear with a medium-hard tooth surface. The method comprises the following steps of: machining of a gear blank: roughly turning and drilling the gear blank after forging and normalizing treatments; rough turning and heat treatment of a tooth shape: roughly hobbing the gear to form the tooth shape; releasing needed grinding amount according to a tooth thickness; then quenching and tempering at medium and high temperature, wherein the heating process of the quenching is under the protection of a carbon potential atmosphere; and carrying out shot blasting after the heat treatment; finish machining of the tooth shape: firstly, finely machining a tooth shape assembling standard of the gear by semi-finish turning and accurate grinding; and then finely machining the tooth shape of the gear by tooth grinding. The gear manufactured by the method disclosed by the invention has the advantages that the hardness of the tooth surface and the tooth root is improved, the hardness of the quenched and tempered tooth surface ranges from about HB340-370, thereby solving the problem that the medium-hard gear hobbing tool with tooth surface hardness higher than HB320 is difficult to machine. As a process of hobbing before the heat treatment is adopted in the method, the hobbing efficiency is greatly improved and the tool loss is reduced.

The invention discloses a tooth modeling method based on dental crown and tooth root characteristics. The tooth modeling method includes the following steps that 1, tooth basis information is determined; 2, the average curvature and the gaussian curvature at a top point of a triangular mesh are determined; 3, the computational processes of the average curvatures and the gaussian curvatures at all the top points of continuous triangular meshes of multiple segmentations of a dental crown are completed; 4, the type of the dental crown is extracted; 5, whether the tooth type is single or not is judged; 6, a tooth model of the single-root tooth is established; 7, the tooth model of the multi-root tooth is established. According to the tooth modeling method, a dental crown model of a single tooth is obtained through a laser three-dimensional scanner, the dental crown and tooth roots are separated, the type of the tooth is determined according to the characteristics of the dental crown, the corresponding tooth root model is established, and the tooth modeling method is high in accuracy, small in calculation quantity, visible, rapid, effective and low in cost.

A stator assembly adapted for use in an electric motor. The assembly includes a stator core having an annular rim and a plurality of teeth extending radially inward from the rim. The stator core has an outer diameter, a root tooth diameter and an inner diameter. Each tooth has a root, a neck extending inward from the root, a head opposite the root, and a length measured from its root to its head. The neck has a width. Each adjacent pair of teeth define a slot having an area. The assembly also includes a winding having aluminum and/or copper wrapped around at least three teeth of the stator core. The stator core and winding have four, six or eight magnetic dipoles. The stator core outer diameter is in a range from about 5.1 inches to about 5.9 inches. The stator core inner diameter is less than about 3.0 inches.

The invention relates to a quantitative calculation method for the meshing stiffness of a gear with a minor defect. In order to describe the influence of a typical gear fault on the time-varying stiffness characteristic, a meshing stiffness energy method calculation model is firstly introduced, wherein five kinds of elastic strain energy, which refers to bending, shearing, radial compression, contact and base deformation, are respectively considered, and five corresponding stiffnesses are further formed. The quantitative calculation method is based on the energy method, the influences of case crush, tooth root crack and tooth breakage on the stiffness distribution are discussed one after another. Aiming at spalling defects, the influences of spalling length (in the meshing direction) and spalling width (in the tooth width direction) on a stiffness distribution curve is researched, and the quantitative relationship between the spalling size and the stiffnesses degradation is obtained. In the aspect of flexural fatigue crack, the change rule of the stiffness curve along with the crack depth, and the quantitative relationship between the stiffness curve and the crack depth are discussed. In the aspect of broken gear tooth, the influence of missing of a single tooth on the stiffness distribution is discussed. By adopting the quantitative calculation method, the actual meshing situation can be really reflected, the complexity and computation in the process of solving can be lowered.

The invention relates to a gear and a method for designing and machining the same. The gear is particularly characterized in that each of tooth crest curved surfaces and tooth root curved surfaces is a part of a convex ring surface or a concave ring surface, each of the tooth crest curved surfaces and the tooth root curved surfaces of the involute gear with the concave and convex ring surfaces is a part of a ring surface, an arc circularly rotates around an axis of the gear to form the ring surface, a tooth profile curve of the end section of each gear tooth is an involute, and the teeth are synchronously distributed around a center point of the tooth width. By the aid of the gear, three gear transmission forms can be realized, the gear not only can be used for driving of parallel axes, but also can be used for driving of intersecting axes with small axial intersect angles, high axis deflection installation errors are permitted when the gear is used for driving of parallel axes, the axial intersect angles are allowed to dynamically change when the gear is used for driving of intersecting axes, transmission ratio can keep constant when the gear is used for driving of parallel axes and driving of intersecting axes, and the gear teeth are not interfered with each other. By the aid of the method for designing the gear, the involute gear with the ring surfaces is divided into a plurality of tiny tapered involute gears, geometric parameter design of the involute gear with the ring surfaces is carried out, and a process of the method is carried out simply, conveniently and feasibly.

The invention relates to a five-axis side milling method for a planar double-enveloping worm, which includes the processing steps of selecting a side milling cutter, determining side milling process parameters, roughing the bottom surface of a worm tooth root by means of five-axis linkage, roughing tooth surfaces on two sides of the worm by means of side milling, performing quenching heat treatment, finishing the bottom surface of the tooth root by means of five-axis linkage and finishing the tooth surfaces on the two sides of the worm by means of five-axis linkage side milling. The five-axis side milling method is characterized in that a side milling tool path is completely generated according to a tooth surface meshing contact line of the worm, a roughing side milling tool path is generated by offsetting the contact line along the normal direction of the tooth surfaces by the distance of roughing allowance, and a finishing side milling tool path is generated by completely overlapping a tool side blade with the tooth surface contact line. The five-axis side milling method effectively solves the problem of uneven roughing allowance of the planar double-enveloping worm, and finishing efficiency and tooth surface processing accuracy are improved.

The invention provides a universal clamp device for total-length finish milling of turbine blades. By adoption of the universal clamp device for total-length finish milling of the turbine blades, the problems that a traditional total-length finish milling clamp is poor in universality and high in tool cost can be solved. The universal clamp device for total-length finish milling of the turbine blades comprises a base plate. A blade crown positioning and pressing assembly is fixedly mounted at one transverse end of the base plate, and a blade root tooth-form positioning assembly and a blade root tooth-form pressing assembly are arranged at the other end of the base plate. The universal clamp device for total-length finish milling of the turbine blades is characterized in that a universal base plate is fixedly mounted on the base plate, and key grooves which are perpendicularly staggered in the transverse direction and the longitudinal direction and connected to be distributed in a latticed mode are formed in the universal base plate; and the root tooth-form positioning assembly and the blade root tooth-form pressing assembly are connected with the key grooves in the universal base plate in an assembled mode through positioning keys, and by adjusting the positions of the positioning keys in the key grooves in the universal base plate, the universal clamp device can adapt to positioning clamping of turbine blades with different air duct lengths.

The invention relates to a speed reducer of sugar maker with rigid tooth surface, and relative rigid tooth surface treatment, wherein it comprises: the I gear axle, I large gear, II gear axle, II large axle, III gear axle, and III large gear are made from high-strength alloy steel; the rigidity of tooth surface is HRC58-62; the treatment comprises: machining the blank, and rolling tooth on it; immerging carbon, checking the depth of carbon layer and the metal structure, quenching, and tempering at low temperature to form the rigid tooth surface; then strengthening the tooth root, and refining it; abrading the tooth to form high-accuracy rigid tooth surface, whose accuracy level is not lower than six level of ISO1328 standard. And the invention has the advantages that: since all gears have rigid tooth surfaces, the abrasion resistance and load ability of gear are improved to reduce or avoid point corrosion, and prolong the service life, reduce the weight and reduce the volume.

The invention discloses a precision forming method for a straight/helical tooth cylinder gear with corners easy to fill and a die. During a closed die forging upsetting stage, a cylindrical blank is manufactured into an intermediate process part with lower corners not tidy enough in an upsetting mode; a volume protruding relative to a tooth outline is reserved near each lower corner of the intermediate process part; during an ejection-out stage, a lower convex die moves upwards, due to the function of a lateral wall conical surface of a concave die, the lower corners, not tidy enough, of the intermediate process part are deformed again, the protruding volumes transfer towards the lower corners, and forming of the lower corners is completed. According to the structure of the concave die, the conical surface with the bottom surface outline larger than the gear tooth top outline is used for expanding a concave die cavity near each lower corner, a cylindrical die cavity of the corresponding portion becomes a big-end-down prism-frustum-shaped die cavity, and the tooth root and the parts far away from the lower corners still keep the cylinder die cavity. By means of the precision forming method for the straight/helical tooth cylinder gear with the corners easy to fill and the die, the problems that according to traditional cylindrical gear precision forming, the gear tooth corners are not full enough, forming force is large, the structure of the die is complex, the service conditions are bad, the service life of the die is short, and the requirements for motions of equipment are complex are solved.

The invention discloses a non-full-symmetry involute gear, a gear cutting hob special for the same, and a machining method of the non-full-symmetry involute gear. The method includes five steps which include: preparing a gear blank which can be used for hobbing, selecting the gear cutting hob special for the non-full-symmetry involute gear, and the like. The axial tooth profile of the gear cutting hob comprises a left tooth profile and a right tooth profile, wherein the left tooth profile comprises linear segments HI, IJ and KL and an arc-shaped segment JK, and the right tooth profile comprises linear segments PO, ON and ML and an arc-shaped segment NM. The end face tooth groove tooth profile of the non-full-symmetry involute gear comprises an involute segment AB, an involute segment EF, a tooth groove left tooth root curve BG and a tooth groove right tooth root curve GE. The non-full-symmetry involute gear has the advantage that the left side and the right side of the teeth of the gear can have different tooth root bending strength. The gear cutting hob can obtain different involute starting points of the a left tooth face and a right tooth face and different tooth root curve curvature radiuses while the left tooth face and the right tooth face of the gear are allowed to have different grinding amount, and defects such as grinding bosses are avoided favorably.

The invention belongs to the technical field of nondestructive detection of a steam turbine for a nuclear power station, particularly relates to an ultrasonic phased array detection method for fir type blade roots of a nuclear main turbine and aims to adopt an ultrasonic phased array detection technology to overcome the defects of small space between blades, complicated blade root structure, signal identification difficulty and the like of conventional ultrasonic detection in a state that blades of a low-pressure rotor of the nuclear main turbine are not dismounted. Four scanning modes are adopted for cross scanning to realize full-area coverage of first tooth roots of the blades and partial coverage of second and third tooth roots, and the defects are accurately quantified, so that the accident of breakage of the blade roots of the blades of the nuclear main turbine is prevented. The method is characterized by comprising steps of system calibration, detection starting and display judgment and quantification. The method has the advantages as follows: ultrasonic detection is carried out without dismounting and mounting of the blades, and the maintenance time is shortened; the four scanning modes are adopted for cross scanning and mutually complemented, and full-area coverage detection of the first tooth root parts of the fir type blade roots is realized; fan-shaped scanning and deep focusing can be realized.

A stator arrangement for an axial-flow machine includes a stator having stator teeth circumferentially distributed concentrically and axially separated from a rotor by an air gap. The stator teeth have two axially-opposite end portions and a tooth core therebetween. Each tooth core is wound with at least one coil winding. The first end portion facing the rotor forms a tooth tip having a tip cross-sectional area larger than the core cross-sectional area. The second end portion, turned away from the rotor, forms a tooth root, having a root cross-sectional area, which is joined to a reflux plate. The tooth tip of each stator tooth as well as the reflux plate respectively has at least one recess for at least one tooth securing device, and each stator tooth is securely joined by the at least one tooth securing device to the reflex plate in at least axial direction.

The invention relates to an arc cycloid harmonic tooth profile, a generation method and device thereof and a storage medium. The method comprises the steps that a flexible gear coordinate system is established; according to the shape tooth profile parameters of a flexible gear tooth top arc, a flexible gear common tangent, a flexible gear tooth bottom horizontal cycloid and a flexible gear tooth root transition arc, corresponding flexible gear tooth profile coordinates are determined correspondingly; a corresponding flexible gear tooth profile is determined according to the flexible gear toothprofile coordinates and preset harmonic transmission parameters, and rigid gear tooth profile points are determined according to the flexible gear tooth profile; and parameter fitting is performed onthe rigid gear tooth profile points, and a corresponding rigid gear tooth profile curve equation is determined. The flexible gear tooth top adopts arc curves, so that the tooth profile bearing capacity is ensured; the flexible gear tooth bottom adopts a flat cycloid curve, so that the gear tooth meshing conjugate interval and the tooth root bending fatigue strength are increased; sharp point contact and tooth profile interference of the flexible gear in the engaging-in and engaging-out processes are reduced by adopting a tooth root transition arc; and the actual meshing condition is considered, a conjugate rigid gear curve is solved by utilizing a harmonic drive envelope conjugate theory, and complete conjugation is ensured.

The invention relates to a flow-constant cam pump rotor profile and a generation method thereof. A main profile of a rotor adopts an involute (CD), a tooth root part and a tooth crest part are formed by arc sections (AB and EF), transition curves are high stage curves (BC and DE) connecting the involute and the arc sections, five sections of curves are connected end to end to form one fourth of the rotor profile, and the entire cam pump rotor profile can be obtained according to a symmetry principle. The generation method of the cam pump rotor profile comprises the steps of: (1) determining a base radius, applying a geometric formula of a figure to elicit the arc radiuses of the high stage curves (BC and DE) of the tooth root and the tooth crest according to the rotor meshing principle, and thereby obtaining the main involute (CD) under the condition of the given pressure angle; and (2) applying the high stage curves (BC and DE) in the joint parts of the arc curves and the involute from the optimized aspect, so as to connect the curves end to end.

The invention provides a plastic cone gear which can increase the fatigue resistance strength of a dedendum and basically does not affect the impact resistance performance of the dedendum; the plastic cone gear is characterized in that a meshing pendant group circular conical surface is worked out by taking rbd as a radius, a first occurrence surface is tangent to the meshing side base conical surface, and a line segment AD is a tangent line of the first occurrence surface and the meshing side base conical surface. When the first occurrence surface purely rolls without slipping along the meshing side base conical surface, the locus of a point A is a meshing side tooth profile curved surface of the plastic cone gear. A non-meshing side base conical surface is worked out by taking rbc as a radius, a second occurrence surface is tangent to a non-meshing side base conical surface, and a line segment BC is a tangent line of the second occurrence surface and the non-meshing side base conical surface. When the second occurrence surface purely rolls without slipping along the non-meshing side base conical surface, the locus of a point B is a non-meshing side tooth profile curved surface of the plastic cone gear. The wheel gear reference circle modulus and tooth depth modulus of the plastic cone gear are unequal; and the design method of big tooth addendum coefficients is adopted.

The invention discloses a motor inner stator with adjustable outer diameter, which is characterized in that a stator iron core is formed by overlapping a plurality of stator iron core stamping pieces in annular integral structures, tooth pieces of the stator iron core stamping pieces are correspondingly overlapped to form unit tooth blocks of the stator iron core, connecting bodies of the stator iron core stamping pieces are correspondingly overlapped to form connecting parts among the unit tooth blocks, the tooth root part of each unit tooth block forms a main yoke part of the stator iron core, each connecting part is bent towards the circle center of the stator iron core and is in an ear shape so as to form a secondary yoke part, the edge of a stator bracket corresponds to the tooth root of each unit tooth block and forms a through slot with each connecting part, a plurality of limiting supporting bosses are arranged at the through slots, and the through slots and the stator iron core are buckled into a whole by using the limiting supporting bosses. According to the inner stator, the coiling difficulty is reduced, the diameter of the motor stator is changed by controlling the degree of shrinking and combining degrees of the stator iron core under a condition that the motor stator iron core stamping piece mold is not changed, and only the size of the brocket is changed, thereby being adapted to stators with different diameters and greatly reducing the production cost of a motor.

The invention provides a large straight gear geometric parameter measurement system and method based on machine vision, and the method comprises the steps: firstly adjusting a camera to a proper position, and enabling the camera to clearly shoot a needed picture; calibrating the camera to obtain an internal reference matrix and a distortion vector of the camera; preprocessing the shot tooth profile local image, wherein the preprocessing comprises distortion correction, image filtering and threshold segmentation; extracting a tooth profile edge local image by using an edge extraction algorithm, and further finely positioning the edge by using a sub-pixel method to obtain a sub-pixel edge; then, extracting key angular points of the tooth profile by using an angular point extraction algorithm, and determining a sub-pixel center of the tooth profile according to the angular points; according to the sub-pixel center, obtaining a gear root circle radius and an addendum circle radius under the pixel coordinate; and through pixel equivalent calibration, obtaining a real root circle radius and an addendum circle radius of the gear, thereby calculating a modulus and a reference circle radius of the gear, and completing measurement of geometric parameters of the large straight gear. According to the method, the measurement automation degree of the geometric parameters of the large straight gear is higher, the function of integrating monocular camera calibration, image processing, parameter measurement and calculation can be achieved, the input cost is low, and the engineering application value is high.

The invention relates to a control method for heating a weathering steel gear, and belongs to the technical field of gear production. The technique uses the characteristic that different frequency currents have different penetration depths to divide the teeth of the gear to be heated into three different heating areas, and uses three single-frequency power supplies to synchronously switch on current of three different frequencies, which are respectively high, medium and medium frequencies, to a circular coil, so as to heat the operation parts including the tooth top, tooth side and tooth rootof the gear to be heated. Meanwhile, the temperature monitoring of the tooth top, tooth side and tooth root is carried out in real time, the temperature difference of the respective parts is calculated, and the power supply heating power regulation corresponding to the respective parts is carried out based on the temperature difference feedback of the respective parts to realize high-precision gradient heating control of the gear to be heated. The temperature difference is controlled within the temperature accuracy, the production cost is reduced under the condition of meeting the requirementsof production quality, and the best economic benefit can be achieved for the enterprise.