460 results about "Centerless grinding" patented technology

Methods of fabricating medical vascular catheters adapted to be inserted into a blood vessel from an incision through the skin of a patient for introducing other devices or fluids for diagnostic or therapeutic purposes and particularly methods for fabricating such catheters with catheter bodies having catheter sections of differing flexibility are disclosed. Such catheter bodies having a proximal catheter body end and a distal catheter body end and formed of a proximal section and at least one distal section that have differing flexibilities are formed in a process comprising the steps of: (1) forming a continuous tubular inner jacket preferably of an inner liner and a reinforcement layer; (2) forming initial layer segments having an initial layer thickness along the length of the inner jacket from a material of first durometer hardness, whereby each initial layer segment is separated by a separation distance: (3) forming a final layer of a material of second durometer hardness with a second layer thickness over the tubular inner jacket along the separation distances and over and/or against the proximal and distal initial layer ends of the initial layer segments to form a continuous catheter body tubing; (4) severing the continuous catheter body tubing into catheter body lengths including a proximal catheter section formed of the material of second hardness and a distal catheter section of the material of first hardness; and (5) completing the catheter fabrication at the proximal catheter body end and the distal catheter body end. Centerless grinding of the catheter body or body tubing, formation of Intermediate catheter body sections, distal soft tips, and discontinuities in the reinforcement layer formed prior to step (2) are also disclosed.

Organic bonded abrasive tools, having controlled microstructures, comprise a relatively low volume percentage of abrasive grain and a relatively low hardness grade, but are characterized by the excellent mechanical strength and efficient grinding performance of much harder grade, lower porosity tools, especially in versatile grinding processes, such as centerless grinding. A method for centerless grinding with these tools is provided. Methods for making the abrasive tools utilizing agglomerated abrasive grain are described.

The invention discloses a mirror finished stainless steel bearing and a process technology thereof, which comprise molding of an inner ring and an outer ring of a bar stock, turning operation, heat treatment, plane centerless grinding, coarsely grinding the channels of the inner and the outer rings, heat treatment, finely grinding the channels of the inner and the outer rings, heat treatment, grinding the channels of the inner and the outer rings, assembly and pressing fit a dust cap. The mirror finished stainless steel bearing and the process technology thereof are characterized in that: 9Cr18 stainless steel is adopted as the bar stock; liquid casting passivation is carried out before fine grinding of the channels of the inner and the outer rings; uniform burnishing treatment with a waxing machine is carried out to the inner ring surface, the two end surfaces and the two chamfers of the inner ring and the outer ring surface, the two end surfaces and the two chamfers of the outer ring after grinding the channels of the inner and the outer rings; the dust cap and a retainer adopt material of stainless steel 304, coated with a vacuum ion coating and colored into golden. The mirror finished stainless steel bearing of the invention has strong corrosion resistance and long service life and can be widely used in special environment, such as food machinery, chemical dyeing, marine equipment, pharmaceutical industry, assembly line of IT industry, etc.

A centerless grinder for grinding an elongated workpiece includes a grinding wheel having a working surface with a plurality of raised areas extending circumferentially around at least a portion of the working surface. A platform is provided having an elongated top surface for supporting the workpiece substantially adjacent to the working surface of the grinding wheel and a front surface with a plurality of lateral grooves for receiving the raised areas on the working surface of the grinding wheel such that movement of the platform toward the working surface into a working area adjacent to the grinding wheel enables the raised areas to pass into the lateral grooves and grind the workpiece. The centerless grinder further includes a first spindle and collet in front of the working area and a second spindle and collet behind the working area, for grinding both ends of an elongated workpiece without removing the workpiece from the grinder, and a wire spool assembly for grinding wire stock directly from the wire spool.

The invention provides a machining and manufacturing method and application of heat-resistant titanium alloy Ti60 wires. The method comprises the steps that Ti60 titanium alloy ingot castings are smelted by adopting a vacuum consumable smelting technology; the smelted Ti60 titanium alloy ingot castings are forged into rods by adopting a free forging technology; the Ti60 titanium alloy rods are finish-forged into thick rod blanks by adopting a finish forging technology; the Ti60 titanium alloy thick rod blanks are rolled into straight strip wire blanks by adopting a hot rolling technology; surface treatment is conducted on Ti60 titanium alloy annealing wire blanks, and pre-oxidation oxidation film hanging treatment is conducted after defects on the surfaces of the wire blanks are removed; continuous high-temperature drawing deformation is conducted on the Ti60 titanium alloy wire blanks obtained after surface treatment by adopting a straight wire drawing machine; the drawn wires are straightened by adopting electric heating tension; and annealing heat treatment is conducted on the straightened wires, and finally centerless grinding is conducted. According to the machining and manufacturing method and application of the heat-resistant titanium alloy Ti60 wires, through combination of different heat machining and heat treating technologies, different matching combinations of the tensile strength, the plasticity and the shearing strength can be obtained, and the heat-resistant titanium alloy Ti60 wires can be used for manufacturing advanced aerospace fasteners such as rivets, bolts and nuts and are used in the temperature range of 600-650 DEG C.

In one aspect of the present invention, an outer diameter (O.D.) centerless grinding machine for use in grinding a diamond workpiece has a grinding wheel positioned parallel to a regulating wheel which is adapted to press a cylindrical workpiece into the grinding wheel as the regulating wheel rotates. Electronic equipment may be adapted to adjust a pressure of the regulating wheel against the grinding wheel. Also, a carrier may be adapted to house the workpiece, the carrier being attached to a translation mechanism adapted to move the carrier between the wheels such that the workpiece is in contact with both wheels.

The invention aims at providing a centerless grinding machine device. The centerless grinding machine device comprises a grinding wheel, a guiding wheel, a workpiece, a layer board, a machine body, a grinding wheel dresser, a guiding wheel dresser, a guiding wheel feeding mechanism, a grinding wheel feeding mechanism, servo motors, mechanical arms and a control cabinet. The workpiece is borne by the layer board. The grinding wheel and the guiding wheel are located on the two sides of the layer board respectively. The grinding wheel feeding mechanism is used for controlling feeding of the grinding wheel. The guiding wheel feeding mechanism is used for controlling feeding of the guiding wheel. The mechanical arms are located on one side of the grinding wheel and one side of the guiding wheel. The mechanical arms are controlled by CNC to grab the workpiece to finish feeding and discharging operation. The centerless grinding machine device has the beneficial effects that the feeding devices are driven through the servo motors, and automatic dressing and automatic compensating of a centerless grinding machine are achieved; the mechanical arms are controlled by CNC to carry out automatic feeding and discharging, the auxiliary time in the machining process is greatly shortened, and the labor intensity of workers is relieved; and the labor cost is reduced, and the machining precision and the productive efficiency are improved.

The invention discloses a high self-sharpening resin binder diamond centerless grinding wheel, comprising a basic body and an abrasive layer. The abrasive layer is made by raw materials in the following parts by weight, 15-25 parts of resin powders, 10-35 parts of micron-order boron carbide, 45-65 parts of polycrystalline diamond, 1-5 parts of FeCrAl alloy fibers, and 1-2 parts of a wetting agent. Compared with a conventional resin binder diamond centerless grinding wheel, the high self-sharpening resin binder diamond centerless grinding wheel is advantaged by high self-sharpening, few grinding wheel dressing frequency, and high durability, and working efficiency is improved. In addition, an improved mixing process is high in efficiency and mixing homogeneity is good, and volume production can be realized, and production efficiency is improved. A mixing process comprises respectively performing dry ball milling by using the abrasive and a binder, and filling the wetting agent to mixing in a machine in a three-dimensional manner, so that mixing efficiency and mixing uniformity effect are improved.

A centerless grinding machine for conical rollers comprises a grinding wheel mechanism, a composite base, a guide plate and guide frame mechanism and a guide wheel mechanism. The grinding wheel mechanism is fixed onto a machine body, the composite base matches with the machine body through a MV guide rail, and the guide plate and guide frame mechanism is arranged on the composite base by a cross roller guide rail through a guide plate and guide frame base. The cross roller guide rail is also adopted on a sliding rail in a grinding wheel dressing part of the grinding wheel mechanism, a grinding wheel spindle adopts a double-support ceramic bearing bush, and the end portion of a grinding wheel dressing pen is provided with a King Kong pen point. The grinding wheel dressing part, the composite base and the guide plate and guide frame base are driven by servo motors, and each servo motor and driving motor are under servo control through a electrical control cabinet. The centerless grinding machine is high in degree of automation, fine in accuracy and consistency of grinding machining, convenient to adjust, mount and maintain, high in grinding efficiency, and lower in equipment failure rate, maintenance load, and maintenance cost.

The invention relates to the field of machining of centerless grinding machines, in particular to a machining process of a loading and unloading conveying device and step shaft sleeves of a centerlessgrinding machine. The centerless grinding machine comprises a grinding machine base, a grinding wheel, an adjusting wheel and a workpiece bracket; the loading and unloading conveying device comprisesa control cabinet, a feeding mechanism, a discharge bin, a loading and unloading conveying mechanism, a loading and unloading clamping mechanism and a pushing device; the control cabinet is electrically connected with the feeding mechanism, the loading and unloading conveying mechanism and the loading and unloading clamping mechanism; the feeding mechanism takes the charge of tidily placing the step shaft sleeves in sequence; the loading and unloading conveying device is an operating procedure of supporting the loading and unloading clamping mechanism, so that the step shaft sleeves are smoothly loaded and unloaded on the grinding machine, and the manual loading time is saved; through cooperation of the pushing device and the discharge bin, full-automatic grinding is realized, so that thelabor intensity of operators is effectively reduced; and a loading clamping hand and an unloading clamping hand can once clamp at least two step shaft sleeves, so that one half of the machining timeis saved, the labor productivity is improved, and the batch production is achieved.

The invention discloses a stepless grinding and polishing device. The stepless grinding and polishing device comprises a main shaft and a revolution plate connected to the lower section of the main shaft. A plurality of grinding head installation positions are arranged on the revolution plate. A stepless grinding head is arranged in each grinding head installation position. Each stepless grinding head comprises a grinding head fixing base with a shaking space. Grinding blocks are connected with the lower ends of grinding wheel shafts. The middle sections of the grinding wheel shafts are provided with spherical motion pairs, wherein the spherical motion pairs are located in the shaking spaces, and gaps are reserved between the spherical motion pairs and the peripheral walls of the shaking spaces. The upper sections of the grinding wheel shafts are connected with the grinding head fixing bases in an elastic mode. In the working process, the grinding method that revolution and free rotation are integrated and the grinding blocks can rotate in all directions in the free rotation process is achieved for the stepless grinding heads, and therefore the surface of a plate to be machined can have a certain profiling function, the surface of the plate can not be easily pressed and damaged, the rough grinding and polishing effects are good, and work efficiency is high. The stepless grinding and polishing device is suitable for machining surfaces of building ceramics, stone materials and decorative plates.

A special numerical-control grinding and milling machine for cams with arc-shaped surfaces comprises a machine body, a crossbeam is arranged on the machine body along an X-direction, an X-direction slide plate is disposed at the front end of the crossbeam, a workpiece spindle box and a tailstock are oppositely arranged on the X-direction slide plate along the X-direction, a workpiece spindle is arranged in the workpiece spindle box, a Y-direction slide plate is disposed on one side, which is positioned on the X-direction slide plate, of the machine body along a Y-direction, a rotating table is arranged on the Y-direction slide plate, a cutter spindle box is arranged on the rotating table, and a cutter spindle is disposed in the cutter spindle box. When the special numerical-control grinding and milling machine is used, a grinding wheel or milling cutter mounted on the cutter spindle can rotate around the axis of the cutter spindle and simultaneously can swing around the central axis of the rotating table in a reciprocating manner along with rotation of the rotating table. Accordingly, the grinding wheel or milling cutter is equivalently used as a roller of a driven plate of a cam shaft with an arc-shaped surface. Simultaneously, the workpiece (the cam with the arc-shaped surface) is driven by the workpiece spindle to rotate in the process, and an inner groove of the cam with the arc-shaped surface can be continuously ground and milled only by means of rotation of the workpiece spindle and rotation of the rotating table during processing.

The invention relates to a grinding machine, in particular to a circular saw blade flank center-less grinding machine and the method thereof to centre-less grinding of the circular saw blade flank. A saw blade feeding operating platform which can be moved from side to side is arranged on one side at the upper part of the machine seat of the grinding machine, a saw blade supporting bracket is arranged on the operating platform, a core axle for suspending the saw blade is arranged on the saw blade supporting bracket, a driving wheel and a motor which rotate with the blade with in a fricative way are installed on the two sides of the saw blade on the operating platform; an abrasion wheel and a back wheel which are provided with independent driving motors and respectively arranged on the both side of the saw blade are installed on the other side of the upper part of the machine seat side by side, axial lines of the two wheels are paralleled, and kept parallel with the plane of the saw blade, the rotating speed of the back is lower than the rotating speed of the abrasion wheel, and clearance which can be grinded, adjusted, and installed into the saw blade is arranged between the two wheels. The invention extends the rod center-less grinding principle, the double side grinding can be finished through a double-face alternate grinding method, and clamped and fixed through the floating of the saw blade, on the basis of ensuring the processing efficiency and processing precision, the production cost can be saved, the energy consumption can be saved, and the processing cot of the saw blade can be decreased.

The invention relates to a bar centerless grinding technology and a special knife board adjusting device thereof; the bar centerless grinding technology comprises the following steps of: firstly carrying out rough machining on a bar so as to enable the workpiece allowance to be between 0.3mm and 0.5mm, the roundness error is below 0.10mm and the straightness accuracy is within 1mm/m; the bar centerless grinding technology and the special knife board adjusting device thereof disclosed by the invention can efficiently eliminate or reduce the original roundness error of a bar blank, thereby controlling the roundness error of a workpiece finished product, improving the product percent of pass and saving the production cost; the whole process flow is simple in process and easy to operate; and the special knife board adjusting device is simple in structure, and convenient to debug and maintain.

The invention relates to a guide wheel modifier, specifically relates to a guide wheel modifier for a centerless grinding machine and belongs to the technical field of bearing processing and centerless grinding. The guide wheel modifier comprises a modifier body, a horizontal moving mechanism and a vertical moving mechanism, and the horizontal moving mechanism and the vertical moving mechanism are arranged on the modifier body. The manufacture structure of the guide wheel modifier for the centerless grinding machine is simple, investing processing costs are much lower than those of an old guide wheel modifier, height adjustment and horizontal moving of a diamond pen are flexible by means of a bidirectional adjustable mechanism, and more importantly, the problem of frequent maintaining in the past is solved; and the operation is convenient, an operator can master work methods after the operator is slightly trained and guided, work efficiencies are greatly improved, and subsidiary work time is reduced.

The invention belongs to the technical field of machining of medical titanium alloy materials and particularly relates to a preparation method of a titanium alloy bar of a universal resetting screw seat. The chemical ingredients of titanium alloy comprise, by mass percentage, 5.9%-6.4% of Al, 3.9%-4.4% of V, 0.15%-0.22% of Fe, 0.09%-0.13% of O, not larger than 0.05% of C, not larger than 0.005% ofH, not larger than 0.01% of N and the balance Ti. The preparation method comprises the steps that firstly, a round bar blank is obtained through the procedures of smelting, forging, and rolling; thena beta single-phase section homogenization annealing treatment process is adopted to obtain a homogeneous fine-grained acicular martensite structure, an electrifying straightening and hyperbolic straightening combined process is used for straightening, the electrifying straightening temperature is controlled to be less than 780 DEG C, and a balanced residual stress state is obtained; and finally,stress relief annealing and centerless grinding are conducted to obtain the finished bar. The preparation method of the titanium alloy bar of the universal resetting screw seat can produce a medicalTi-6Al-4V alloy bar basically free of stress, the Ti-6Al-4V alloy bar has excellent fatigue life, and a qualified raw material is provided for manufacturing of universal resetting screw seats of orthopedic medical instruments.

The invention provides a novel centerless grinding device for a pole blank. The novel centerless grinding device for the pole blank comprises a grinding mechanism and a feeding mechanism, wherein the feeding mechanism comprises a material storage box and a conveyer, the material storage box is open and oblique, the conveyer comprises a conveyer belt, the bottom wall of the material storage box is provided with a propping plate, the upper end of the propping plate is oblique, and an oblique guide plate is arranged between the upper edge of the lowest box side wall and the conveyer belt. Therefore, the novel centerless grinding device for the pole blank breaks through the construction form of tradition centerless grinding device, the propping plate props the pole blank to be higher than the upper edge of the lowest box side wall, the pole blank rolls to the oblique guide plate and further rolls to the conveyer belt, and then is conveyed to the grinding mechanism by the conveyer belt for grinding; when material at the lower end of the material storage box reduces, the material at the higher end automatically rolls to supplement; compared with prior art, the feeding mechanism of the novel centerless grinding device for the pole blank can feed the grinding mechanism organically and continuously, and the whole device has high degree of mechanization, much smoother grinding, high efficiency and strong practicability.

The present invention pertains to a centerless cylindrical grinding machine with a grinding wheel and a regulating wheel that can be laterally displaced toward a work piece that can be held between these wheels, and with a rest blade for supporting the work piece that is realized rigid in the vertical direction and arranged and dimensioned such that a rotational axis of the work piece and a rotational axis of the grinding wheel lie in a common plane, wherein a height adjustment of the rotational axis of the regulating wheel beyond the plane is kinematically decoupled from the lateral displacement of the regulating wheel and can be varied in order to position the regulating wheel on the supported work piece.

The invention belongs to the technical field of machining equipment, and relates to a centerless grinding machine, in particular to a feeding and discharging device for a centerless grinding machine for performing plunge-cut grinding on bearing rollers. The feeding and discharging device comprises a grinding frame, wherein a transverse guide track is fixed on the upper portion of the grinding frame; a sliding plate is slidably arranged on the guide track; a first cylinder is arranged on the top of the grinding frame; a piston rod of the first cylinder is connected to the sliding plate; a guiding cylinder is arranged on the sliding plate; a piston rod of the guiding cylinder faces the vertical direction; the lower end of the piston rod of the guiding cylinder is fixedly connected with a mechanical arm; the mechanical arm is provided with two support arms; and a discharging sucker and a feeding sucker are respectively arranged on mounting workstations of the two support arms.

The invention discloses a method for preparing a polycrystalline raw bar material for a molybdenum-niobium alloy monocrystal. The method comprises the following steps: after mixing FMo-1 powder and FNb-1 powder by a material mixer, pressing powder into a blank bar and sintering the blank bar at high temperature into a sintering bar; welding the obtained sintering bar into an electrode, smelting the electrode in an electron beam smelting furnace twice, preparing a molybdenum-niobium alloy cast ingot, extruding and processing the molybdenum-niobium alloy cast ingot after processing by a machineon an oil press directly into a molybdenum-niobium alloy polycrystalline bar material, aligning the molybdenum-niobium alloy polycrystalline bar material and carrying out shot blasting; and heating the molybdenum-niobium alloy polycrystalline bar material under the atmosphere of argon gas, forging and then preparing the polycrystalline raw bar material for the molybdenum-niobium alloy monocrystalline by centreless grinding. The invention has simple technique and low cost, the total content of impurity elements in the prepared polycrystalline raw bar material does not exceed 500ppm, the bar material has uniform tissues and does not have the defects of cracks or air holes and the like, and the straightness of the polycrystalline raw bar material is not greater than 1mm/m.