49results about How to "Avoid out of tolerance" patented technology

The invention relates to a clamp mechanism for processing a piston pin hole of a compressor, and belongs to the technical field of frock clamps. The clamp mechanism comprises a substrate, a cam shaft, a cam shaft control device, a pair of spherical pair lifting gears and a spherical pair hold-down gear, wherein the bottom of the substrate is provided with a cam cavity; the upper part of the substrate is provided with a workpiece seat; the workpiece seat is provided with a workpiece cavity; the bottom of the workpiece cavity is provided with a cutter through hole; both ends of the cam shaft are rotationally arranged on the substrate; the middle part of the cam shaft corresponds to the inside of the cam cavity; the cam shaft control device is linked with an end part of the cam shaft; the pair of spherical pair lifting gears corresponding to each other is arranged on the workpiece seat of the substrate and corresponds to both sides of the workpiece cavity; lower parts of the pair of spherical pair lifting gears extend into the cam cavity, are in contact with the cam shaft and are actuated by the cam shaft; and the spherical pair hold-down gear is linked with upper parts of the spherical pair lifting gears. The clamp mechanism for processing the piston pin hole of the compressor not only guarantees to reliably clamp a piston to avoid the piston moving about, but also avoids damaging the piston and avoids the deformation of a clamped position of the piston, and has convenient operation.

The invention discloses a bending stamping die, which comprises an upper cover plate, an upper die holder, an upper base plate, a punch fixed plate and an upper equal-altitude limit block which are connected sequentially and a lower equal-altitude limit block, a lower die plate, a lower base plate and a lower die holder which are connected sequentially, wherein a lower forming block is arranged on the middle part of the lower equal-altitude limit block; a positioning needle is arranged on the middle part of the lower forming block; a stripping sleeve passes through the middle parts of the upper base plate and the punch fixed plate; the stripping sleeve is connected with a stripping block arranged on the middle part of the upper equal-altitude limit block; and a forming punch corresponding to the lower forming block is arranged on the punch fixed block. The shape of a lower die is consistent with that of a part, a male die is subjected to resilience appropriately, and materials are pressed by a spring, so that the part is formed at one time. Therefore, out-of-tolerance caused by repeated bending is prevented, an error is reduced and labor and time are saved.

The invention belongs to the precise investment casting technology and relates to a method for controlling aero-engine hollow guide blade upper edge plate cavity wall thickness. The method is characterized in that the hollow guide blade upper edge plate wax pattern cavity wall thickness is changed to control casting cavity wall thickness, the front edge of the core body (3) of a ceramic core (7) is allowed to tilt towards a non-runner face, and the included angle alpha of the lower surface (11) of the core body (3) and the runner face (10) of a hollow guide blade upper edge plate wax pattern is allowed to range from 0 degree 30 minutes to 1 degree. By the method, hollow guide blade upper edge plate casting wall thickness evenness at hollow parts is guaranteed, design drawing requirements are satisfied, oversize and scrap are avoided, production yield is increased, and production cost is lowered.

The invention discloses a system for debugging a half-speed steam turbine protection system of a nuclear power plant. The system for debugging the half-speed steam turbine protection system of the nuclear power plant comprises a simulation machine and a valve debugging device, wherein the simulation machine is connected with the steam turbine protection system and used for simulating multiple operating parameters of a steam turbine and sending the multiple operating parameters of the steam turbine to the steam turbine protection system, so that protection action of the steam turbine protection system is tested; and the valve debugging device is connected with a main steam valve of the steam turbine and used for simulating a control signal of the steam turbine protection system to the main steam valve, and whether action of the main steam valve is matched with action of the steam turbine protection system or not is tested by testing opening and closing of the main steam valve. The invention further discloses a method for debugging the half-speed steam turbine protection system of the nuclear power plant. By adoption of the system and method for debugging the half-speed steam turbine protection system of the nuclear power plant, the risks of machine tripping and reactor tripping can be lowered, and the safety and reliability of the system are improved.

The invention discloses a batching control method and system of a concrete batching plant. The batching control method of the concrete batching plant comprises the following steps: sensing the first weight value of materials in a weighing hopper of the concrete batching plant when a first closing instruction is given, wherein the first closing instruction is used for controlling a rough weighing door or/and a fine weighing door of the concrete batching plant to close; sensing the second weight value of the materials in the weighing hopper of the concrete batching plant when the rough weighing door or/and the fine weighing door of the concrete batching plant is/are closed, and starting a fine weighing pulse batching manner; computing the material difference value between the second weight value and the first weight value; computing and updating a current first threshold according to the material difference value and a preset fine weighing pulse frequency or according to the first threshold and the preset fine weighing pulse frequency, wherein the first threshold is the weight threshold of materials giving the first closing instruction in the batching process of concrete. The batching control method and system of the concrete batching plant can be used for realizing automatic and precise batching.

The invention relates to the field of boring machines, in particular to a rolling mill stand boring machine. The rolling mill stand boring machine comprises a boring head mechanism, a workbench and a machine body, wherein the workbench can move on the machine body, a protective cover is arranged on the machine body, the boring head mechanism is fixed on the machine body and comprises eight boring heads, shafts III, shafts II and a shaft I, the boring heads correspond to plum blossom holes of a rolling mill stand in a one-to-one mode, one boring head is arranged on each shaft III, every two shafts III are linked with one shaft II through gears, the four shafts II are linked with the shaft I through gears, the shafts III and the shafts II are distributed symmetrical to the shaft I, a boring tool is arranged on each boring head, the boring tools are distributed according to fixed angles, and the boring tools on the same diagonal line are distributed symmetrical to the axial center of the shaft I. By the adoption of the scheme, precision machining of the eight semicircular plum blossom holes of the rolling mill stand is achieved.

The invention belongs to a numerical control turning technology, which relates to a method for judging correctness of a cutter compensation value input to a numerical control turning machine tool. The method for judging correctness of the cutter compensation value input to the numerical control turning machine tool is characterized by comprising the steps of: determining a cutter compensation value range of each feed line of a part to be machined; compiling a machining program according to a central difference and an imagined tool nose in light of size of the part to be machined; storing the cutter compensation value range in X-axis and Z-axis directions to the machining program; inputting the special cutter compensation value to a cutter abrasion storage area; and adding a cutter compensation value judgment module in an initial part of the machining program. According to the method for judging correctness of the cutter compensation value input to the numerical control turning machine tool provided by the invention, the product which is overproof or rejected caused by a mistaken input cutter compensation value is avoided, undulation of product quality is reduced, and the product cost is lowered.

The invention discloses a tooth profile detection mold, a measurement method, an evaluation standard and a coping method. The tooth profile detection mold comprises a tooth crest fitting edge, a firstmeasurement reference edge and a second measurement reference edge, a tooth profile measuring method and an evaluation standard are stipulated, the standard tooth pitch is set to be P0 +/-T0, and when the interval G is smaller than or equal to T0, the tooth profile can not be ground; when the interval G is larger than T0, the tooth profile needs to be ground; when the distance P is out of tolerance slightly, the meshing surface of the detected rack attached to the lower portion of the tooth profile detection die is ground; when one tooth below is ground, the distance of the subsequent tooth surface below is small and out of tolerance, and grinding should be conducted downwards and smoothly; when the distance P is too large, the meshing surface of the detected rack attached to the upper portion of the tooth profile detection die is ground; and when the upper tooth is ground and the distance of the subsequent tooth surface at the upper part is too large and out of tolerance, the grinding is upwards and smoothly carried out. The pitch precision can be effectively improved, the problems of lifting load out-of-tolerance, sudden change and the like caused by pitch out-of-tolerance and pitch sudden change are controlled, and the transmission precision is improved.

Disclosed is a double-sided turning cutting tool clamping mechanism and method for thin-wall uniform-thickness parts. A tool clamping main body of the double-sided turning cutting tool clamping mechanism is connected with a machine tool cutter frame. A cutting tool installing hole is formed in the lower part of the tool clamping main body. Upper turning tools and lower turning tools in the cuttingtool installing hole are installed parallelly and tool noses of each upper turning tool and the corresponding lower turning tool are opposite. The upper turning tools and the lower turning tools arefixed through tool fastening bolts. The upper part of a feeler block installing frame is connected with the tool clamping main body and a feeler block is fixedly installed at the lower part of the feeler block installing frame. Turning tool separation distance adjusting cushion blocks are installed between the upper turning tools and the lower turning tools. The tool clamping main body below the lower turning tools is provided with a tool height trimming bolt. The double-sided turning method includes the steps that the tool clamping main body is connected with the machine tool cutter frame; the feeler block is installed; the lower turning tools are installed to make the tool noses of the lower turning tools abut against tool setting points; the upper turning tools are installed and the turning tool separation distance adjusting cushion blocks are placed between the upper turning tools and the lower turning tools to make the tool noses of the upper turning tools abut against tool setting points; the tool fastening bolts are tightened; the feeler block installing frame and the feeler block on the feeler block installing frame are dismounted; and a turning-lathe is started to conductsynchronous turning of the upper and lower end surfaces of the parts.

The invention discloses bearing ring automatic machining equipment. The equipment structurally comprises a controller, an operating console, a body, a tool, a soft claw disc mounting base and a soft claw disc. The operating console is arranged at one end of the top end surface of the body, and the soft claw disc mounting base is mounted at the other end of the top end surface of the body. The soft claw disc is movably mounted on the soft claw disc mounting base. The controller and the tool are mounted on the portion, located at one side of the operating console, of the body in parallel. The tool is located between the soft claw disc mounting base and the controller. The soft claw disc is composed of a claw, a sliding base, a claw body and a motor. The motor is located under the claw body. According to the bearing ring automatic machining equipment, through cooperation of the claw, the claw body, the motor and the like, on the one hand, a circular truncated cone is made to rise and fall continuously by means of forward and reverse rotating of the motor, meanwhile, the contact area is further increased through uniform three-point force application and an L-type structure and a piston of the claw, the clamping stability and the adjusting convenience are improved, and it is guaranteed that no single plane inner diameter/outer diameter variation deviation occurs when an extra-large thin-wall bearing is machined.

The invention belongs to the technical field of double-layer tablet pressing in the pharmaceutical machinery industry and particularly relates to a double-layer tablet press. The double-layer tablet press comprises a first layer metering component, a first layer prepressing component and a second layer metering component, wherein the first layer prepressing component comprises a prepressing cylinder, an upper prepressing wheel and a lower prepressing wheel; a piston rod of the prepressing cylinder faces downward and is connected with an adjusting base below the piston rod; the lower prepressing wheel is arranged on a cylinder body of the prepressing cylinder; the second layer metering component comprises a metering track and a metering cylinder; the end part of a piston rod of the meteringcylinder is connected with the metering track; the end close to the lower prepressing wheel, of the metering track is provided with an inclined guiding table; and the cylinder body of the prepressingcylinder in the first layer metering component is connected with a cylinder body of the metering cylinder in the second layer metering component to form a whole body. The invention further provides amethod for preparing double-layer tablets by adopting the double-layer tablet press. By use of the method disclosed by the invention, synchronous adjustment of first layer prepressing and second layer metering in the preparation process of the double-layer tablets can be realized, the adjusting difficulty is reduced, the production efficiency and the finished product rate are improved, and the operating safety of equipment is also improved.

The invention relates to a fiber reinforced ceramic matrix composite heat-resistant plate and a preparation method thereof, the back of the heat-resistant plate is provided with a boss, the boss is provided with a groove, the groove is provided with an internal thread, the groove is in threaded connection with a stud, and the length of the stud is greater than the depth of the groove. The groove is formed in the boss, the internal thread is machined in the boss, in the preparation process, after the boss is connected with the stud, the ceramic matrix is filled in the gap between the stud and the thread by repeating the dipping-curing-cracking procedure in the step (6), the boss and the stud are fixedly connected into a whole to serve as a connecting piece, and compared with a connecting method that the boss is machined to be provided with the external thread, the height and the thickness of the boss are reduced, and the problems that the core of the boss is not compact and low in strength are solved.

The invention discloses a stacked oil-cooler vacuum brazing clamp, belongs to a vacuum brazing clamp, and aims at providing the vacuum brazing clamp capable of efficiently improving the brazing qualification rate. The vacuum brazing clamp comprises a positioning assembly and a pressing assembly, wherein the positioning assembly is composed of a supporting block (7), a positioning pin (8) and threestep-shaped supporting shafts (5), wherein the supporting block (7) and the positioning pin (8) are fixed on the surface of lower channel steel (6), the step-shaped supporting shafts (5) are fixed onthe surface of lower channel steel (6), and the three supporting shafts (5) are distributed in a triangular manner; and the pressing assembly is composed of upper channel steel (1) supported on the three supporting rods (5), studs (12) which upwards penetrate through the upper channel steel and are connected with nuts, pressing plates (9) which are fixed at the lower ends of all the studs (12) and springs (2) which are positioned between the pressing plates and the upper channel steel (1) and arranged on the corresponding studs (12). The vacuum brazing clamp for an oil cooler is simple in structure and convenient to operate.

The invention discloses a thin-wall sealing ring machining system and method. The machining method comprises the steps that a blank is obtained, the outer circumferential face is subjected to rough turning, and a large end face clamping edge and a small end face clamping edge are formed; the inner peripheral surface near the large end surface is roughly turned to form an axial step near the small end surface of the inner peripheral surface; axial steps, close to the small end face, of the outer side and the inner circumferential surface of the small end face clamping edge are clamped, and a large end face groove and a small end face groove are roughly turned; two axial end faces of a part are clamped, and a large end face boss and a small end face boss are milled; finish turning is carried out on a process standard; the finish turning is carried out to a target size; and the part is divided into two parts through linear cutting. According to the method, a stable treatment procedure is canceled, the part machining period is shortened, the process route is optimized, and all shapes, positions and sizes are machined in one procedure; by adjusting the machining sequence of numerical milling and numerical turning, the situation that after numerical milling machining, the size of the numerical turning procedure is deformed, and consequently parts are out of tolerance is effectively prevented; and a feeding mode of the numerical turning program is optimized, and deformation of the part is reduced.

The invention belongs to the field of machining, and relates to a method to make a standard surface roughness by boring an aluminum alloy. The method includes that (1) the selected machine tool is a machining center machine tool, which has a high-precision linear motion guide rail, a precise spindle bearing, a ball screw and a highly efficient servo drive motor; (2) a mallet is used for alignment when a machining member is clamped and positioned; (3) a through hole boring cutter is an ordinary boring cutter with a cutting edge angle of 45-75 degrees, and the selected blade is a blade made of dedicated boring aluminum material; (6) a process scheme includes the procedures of rough boring, semi-fine boring and fine boring; and (8) rough and finish machining are conducted, with the allowance of <phi>0.1mm prior to finish machining, machining <phi> 80H7, rotating speed S500, and feed F16; and the machining <phi> 88F7, rotating speed S500, and feed F16.

The invention relates to a cylindrical mirror and coded disc glass bonding device and method based on non-coplanar marking lines, and belongs to the technical field of photoelectric detectors. According to the cylindrical mirror and coded disc glass bonding device, the upper surface of a base serves as an XOY plane of a measurement system coordinate system, a coordinate axis perpendicular to the XOY plane serves as a Z axis of the measurement system coordinate system, and a two-dimensional moving platform is located on the upper surface of the base and can move in the X-axis direction and theY-axis direction of the measurement system coordinate system; a code disc cylindrical mirror bonding die is located on the two-dimensional moving platform and used for stacking a code disc and a cylindrical mirror, and the position of the code disc or the cylindrical mirror relative to the two-dimensional moving platform can be adjusted in the X-axis direction and the Y-axis direction of a coordinate system of the measuring system; the stand column is vertically installed on the base, a microscope optical system and a CCD camera are installed on the stand column, the microscope optical systemis used for imaging the stacked coded disc and cylindrical mirror, and a lens of the CCD camera is aligned with an ocular lens of the microscope optical system and used for carrying out photoelectricconversion on an image formed by the microscope optical system and uploading the image to a computer.

The invention discloses a device for welding and assembling installation seats on an aero-engine combustor diffuser case. The device comprises a base and six kinds of supporting base assemblies which are fixedly arranged on the base and used for positioning the six kinds of installation seats on the diffuser case correspondingly. Each installation supporting base assembly comprises a supporting base body fixed to the base, a supporting pin, a lock screw, a baffle and a jacking screw, wherein the supporting base body is provided with a pin hole matched with the supporting pin, and a threaded hole which is matched with the lock screw to form a lock thread pair so that the supporting pin can be fixed into the pin hole; the supporting pin is provided with a matching section matched with an installation hole of the corresponding installation seat; the baffle is fixed to the end of the supporting pin through a threaded structure, located in the wall surface of the diffuser case and provided with no less than two threaded holes matched with the jacking screw; and the installation seats to be welded and assembled are positioned on supporting and positioning structures of the supporting pins through the jacking screws. The device provided by the invention is accurate and reliable in positioning, and the problem that hands are burnt is solved.