48results about How to "Meet tolerance requirements" patented technology

The invention belongs to aerospace product machining technology equipment and particularly discloses a positioning support device for stir friction welding of a storage box cylinder section circular seam. A central shaft disk is arranged above a rotating base seat, a support ring is arranged in the center of the central shaft disk, a top ring is arranged above the central shaft disk, a connecting disk is arranged above the central support ring, long support rods are arranged outside the connecting disk, a short support rod is connected with the rear end of each long support rod, and internal threaded holes are arranged in two ends of left end and right end of a double-stud structure of an adjusting sleeve and respectively connected with the long support rods and the short support rods; the rotating base seat is a perpendicular long positioning rod and a pressing rod, and a pressing plate is arranged above the pressing rod; and a perpendicular short positioning rod is installed between the short support rods and the rotating base seat. Due to the cyclic structure which is formed by the long support rods and the short support rods is adopted, products on a cylinder section can be positioned and supported, positioning error is effectively reduced, and tolerance requirements of welding can be met, and at the same time, parameters in the welding process are stable, internal stress and deformation are small, and positioning support device is further favorable for preventing weldments from being pierced through by a stirring needle.

The invention discloses a mould for a multilayer multi-way hydraulic valve and a casting process thereof. The casting process comprises: cleaning a mould, adjusting the mould, selecting a shell mold and a sand core material, then entering a manufacturing and molding working procedure, and finally casting and mold stripping. The process matched with the mould for the multilayer multi-way hydraulic valve adopts a method with the shrinkage characteristic of the process to control shrinkage amount of a casting, namely controlling the shrinkage amount of the casting by placing a plurality of layers of asbestos cloth at a sand core head of a main flow passage of the casting, finely adjusts the tolerance of the dimension of the casting by adjusting the layer number of the asbestos cloth, smoothly solves the problem of requirement on the dimensional precision of a CAT casting, and is a casting process which can manufacture the multilayer multi-way hydraulic valve with higher precision requirement and stable quality.

The invention provides a device and a method for restraining extra-high-voltage main transformer no-load closing electromagnetic transient problems. The device comprises a transformer circuit breaker and a control module, the transformer circuit breaker comprises a main contact, a closing resistor and an auxiliary contact, the auxiliary contact is serially connected with the closing resistor and then parallelly connected with the main contact, the value of resistance of the closing resistor is determined according to resonant overvoltage, excitation inrush current, voltage sag, energy consumption of the closing resistor within a preset range when a no-load main transformer is closed, the control module controls the auxiliary contact to connect when the transformer circuit breaker is closed, so that the closing resistor is serially connected into a loop, and the control module controls the main contact of the transformer circuit breaker to close after a preset period of time, so that the closing resistor is short-circuited. The value of resistance of the closing resistor in the transformer circuit breaker is selected in terms of the resonant overvoltage, the excitation inrush current, the voltage sag and the energy consumption of the closing resistor, and closing and space-variant requirements of a transformer in an extra-high-voltage power transmission system are met.

The invention relates to a drilling platform pile leg segmented closing technology. The drilling platform pile leg segmented closing technology mainly includes the steps of hoisting and closing an offshore pile leg after platform pile pitching positioning is completed, wherein the hoisted pile leg is segmented into five segments from bottom to top before closing, the five segments include a first pile leg segment, a second pile leg segment, a third pile leg segment, a fourth pile leg segment A and a fourth pile leg segment B, the first pile leg segment, the second pile leg segment and the third pile leg segment are closed by a floating crane, and the fourth pile leg segment A and the fourth pile leg segment B are closed by a crawler crane. The drilling platform pile leg segmented closing technology has the advantages that a pile leg structure is constructed by three large segments and two small segments according to the pile leg closing method, and by means of reasonable switching between the floating crane and the crawler crane, workload is reduced and closing period is shortened by about two months.

The invention discloses an existing railway line mileage lofting method based on an aerial survey technique. The method comprises the following steps of extracting of discrete point coordinates, forward projecting of the coordinates, complete railway mid-line generating, line mileage valuating, backward projecting of the coordinates and mileage lofting. According to the existing railway line mileage lofting method, accumulation of manual measurement errors and occurrence of gross errors are weakened, labor input is reduced, the working efficiency is improved, and train operation accidents caused when railway signals are disturbed by a steel rule are avoided; traditional existing line on-line operation can be replaced, the error tolerance requirement of railway mileage measurement can be met, and the mileage lofting precision can meet the standard requirement of 1/2,000.

The invention relates to a calculating method for the compensation quantities of hull segments. The calculating method comprises the following steps that the maximum positive value E of the main dimension standard tolerance of a hull is obtained and distributed to all parts of the hull; the maximum positive value of the main dimension standard tolerance of all the parts of the hull is obtained; the maximum positive value of the main dimension standard tolerance of all the parts of the hull is decomposed to the segments of all the parts of the hull, and the standard tolerance maximum positive values of the segments of all the parts of the hull are determined; difference values of the closure opening welding clearance and welding shrinkage allowance of the segments of all the parts of the hull are calculated; the difference values of the closure opening welding clearance and welding shrinkage allowance of all the parts of the hull are compared with the standard tolerance maximum positivevalues of the segments of all the parts of the hull, and the compensation quantities of the segments of all the parts of the hull are determined according to the comparing result. According to the calculating method for the compensation quantities of the hull segments, through the requirement for combining the main dimension standard tolerance of the hull with the functional clearance set out according to the performance requirements of a ship, the increased compensation quantities during segmented manufacturing are determined by calculation, the hull manufacturing precision is improved, andmaterial waste is avoided.

The invention discloses a blind hole machining method. The blind hole machining method includes the following steps that the size of a circle is determined according to the size of a blind hole, the position of the center of the circle is determined on a material with a laser machine, and meanwhile the length distance between a laser head of the laser machine and plastics is determined; the size of a light spot on the material by a laser is adjusted to enable the radius of the light spot to be equal to the size of the blind hole; machining is performed by the laser machine, and a preliminary hole of a straight segment of the blind hole is machined; a broach is used, and the straight segment is drawn in the preliminary hole; a milling cutter is used for machining a conical portion of the bottom of the blind hole, a reamer is used for reaming edges, and the tolerance is 1-3mm. According to the blind hole machining method, the steps for machining the blind hole are simple, the quality of the blind hole is good, the bottom is smooth, in addition, the requirement for the tolerance can be met, and the quality of the blind hole is improved.

The invention relates to a powder metallurgy sintering method of a non-magnetic steel structural component. A powder metallurgy sintering device is adopted for carrying out sintering. The powder metallurgy sintering method comprises the following steps that a green body of the non-magnetic steel structural component is obtained; the powder metallurgy sintering device is provided with a tray used for containing the green body, and sand is laid at the bottom of the tray so as to form a placing sand layer; and the green body is placed on the placing sand layer to be sintered, and the non-magnetic steel structural component is obtained. According to the powder metallurgy sintering method, size changes generated before and after non-magnetic steel structural component sintering can be reduced, and the tolerance of the non-magnetic steel structural component can meet the market requirement.

The invention relates to burr removing through a laser and provides a method for removing burrs of plastic parts through a laser. The burrs on the surface of the plastic parts are removed through coordination of a laser system and a CCD positioning system, after debugging and correction are conducted, the outlines of the plastic parts are sectioned in sequence through a simple figure, the compensation values between the plastic parts subjected to burr removing through the laser and clean plastic parts are determined, and the burrs of the plastic parts in batches are removed by the laser system according to the compensation values. According to the method for removing the burrs of the plastic parts through the laser, the plastic parts are sectioned through the simple figure, the compensation value of burr removing through the laser system in each section is determined, burr removing of the plastic parts in large batches can be conducted through coordination of the laser system and the CCD positioning system, the tolerance requirement of the plastic parts obtained after the burrs are removed can be met, labor is reduced, cost is reduced, burr removing can be conducted on the plastic parts in large batches, and the efficiency and quality of burr removing are very high.

The invention discloses a shape trimming method for a honeycomb sandwich floor part. The shape trimming method for the honeycomb sandwich floor part comprises the following steps that a horizontal worktable is customized; the honeycomb sandwich floor part is fixed to a special auxiliary tool which is shared by shape machining, positioning and inspection; and a trimming cutter, with a bearing and a cylindrical milling cutter, dedicated to the honeycomb sandwich floor part is clamped on a trimmer, the posture of the trimmer is adjusted, a retainer ring of the trimmer is attached to the upper surface of the part, the trimming cutter is ensured to be perpendicular to the horizontal worktable, the trimmer is horizontally moved along the edge of the part to trim the shape of the part, and after machining, the auxiliary tool is used for inspecting the shape of the part. According to the shape trimming machining method for the honeycomb sandwich floor part, the cost is greatly reduced, the efficiency is greatly improved, and the design tolerance requirement is met. The shape trimming device for the honeycomb sandwich floor part has the same beneficial effects.

The invention belongs to the technical field of aerospace surface treatment and particularly relates to an electropolishing method for a cylindrical stainless steel thin-wall corrugated pipe. The electropolishing method comprises the following steps that 1, degreasing treatment is conducted on a stainless steel corrugated pipe blank; 2, acid pickling treatment is conducted on the corrugated pipe degreased in the step 1; 3, the corrugated pipe obtained after acid pickling in the step 2 is clamped; 4, electropolishing treatment is conducted on the corrugated pipe clamped in the step 3; 5, passivating treatment is conducted on the corrugated pipe obtained after electropolishing in the step 4; and 6, after electropolishing, the surface is cleaned with distilled water and is dried through blowing. According to the shape of the compensator corrugated pipe, a special clamping tool and an inner cathode are prepared, meanwhile technological parameters are adjusted again, and electropolishing production is conducted with special bath solution. The electropolishing method is used, the inner and outer surfaces of the polished corrugated pipe are good in glossiness, the thickness and roughnessmeet tolerance requirements, and the surfaces are free of pit or spot phenomenon.

The invention discloses a control valve of a carbon tank. The carbon tank comprises an upper cover and a shell, wherein the upper cover is provided with a Laval pipe shaped through hole; the shell is internally provided with a magnetic tank, a coil framework, a coil, a contact pin, a magnetic core, armature iron and a valve seat; and the magnetic tank is internally provided with a cavity. The coil framework, the coil and the contact pin are mounted in the cavity; the coil framework is provided with a hollow shaft; the coil is wound at the periphery of the hollow shaft of the coil framework; the contact pin is fixed on the coil framework; a copper line of the coil is electrically connected to one end of the contact pin; the magnetic core is located in the hollow shaft of the coil framework and is fixed with the magnetic tank by screw threads; the armature iron and the valve seat are respectively arranged on the coil framework; a through hole with a radial section is arranged at the center of the valve seat; and a spring is arranged between the magnetic core and the armature iron. By adopting the Laval pipe structure, the control valve of the carbon tank, disclosed by the invention, can overcome a difference of pressures at two ends of the control valve of the carbon tank and realize a relatively steady gas flow.

The invention relates to a multi-angle adjustable lower mold assembly. The multi-angle adjustable lower mold assembly comprises a lower mold and driving parts, the center of the upper part of the lower mold is used for placing a part to be plastically packaged, the driving parts are longitudinally arranged and mounted at the lower part of the lower mold, the number of the driving parts is two or above, and each driving part can independently drive the lower mold to move up and down so as to adjust the part to be plastically packaged on the lower mold at multiple angles. The plurality of driving parts capable of working independently are directly connected to the lower mold to drive the lower mold to move and are arranged at different positions, the position of the mold is finely adjusted in different directions, and in a plastic packaging press, when the plurality of the driving parts are driven to synchronously move and independently move to realize plastic packaging mold closing, the thickness dimension of a plastic package body meets the tolerance requirement after the part to be plastically packaged is subjected to plastic package in different directions.

The invention provides a width measuring tool for a groove in a hole. The width tolerance of an oil groove in a workpiece hole can be measured simply and conveniently, the measuring efficiency is high, and the processing quality of the oil groove in the workpiece hole is guaranteed. The measuring tool comprises a measuring gauge provided with a through hole, a movable measuring rod is arranged in the through hole and connected with an operation handle through a long slot, and measuring heads with different diameters are arranged at two ends of the measuring rod.

The invention relates to a die with an ejector sleeve ejection structure. A template, a die block, a fixing plate, an inlaying needle, an ejector sleeve, an elastic block and an elastic piece are included. The fixing plate is fixed to the template or fixed to the bottom of the die block. The first end of the inlaying needle is connected with the fixing plate, the ejector sleeve is movably in cup joint to the inlaying needle, and a protruding block is arranged at the first end of the ejector sleeve. The ejector sleeve movably penetrates through the die block, and the second end of the inlayingneedle and the second end of the ejector sleeve lead to the forming area. A groove is formed in the first end of the elastic block and matched with the protruding block and comprises a stop wall located on side, close to the second end of the ejector sleeve, of the protruding block. The elastic block movably penetrates through the die block, and the second end of the elastic block leads to the contact area. The first end of the elastic piece is connected with the template or the fixing plate, and the second end of the elastic piece is connected with the first end of the elastic block. The sideface, away from the second end of the ejector sleeve, of the protruding block is connected with the second end of the elastic piece or connected with the groove. During die stripping, the appearanceface and boss glue position tolerance are not influenced.

The invention relates to a steering gear trapezoidal copper bar detection gauge. The steering gear trapezoidal copper bar detection gauge is characterized in that an inspection gauge, a left gauge anda right gauge are combined together for measurement, a comparative measurement method is adopted for calibrating the left gauge, the right gauge and the inspection gauge, the dimensions of the inspection gauge are strictly designed according to a dimensional tolerance range of a steering gear trapezoidal copper bar, and the steering gear trapezoidal copper bar can be measured after confirming that the upper planes of the left gauge and the right gauge coincide with graduated lines on the inspection gauge, and the steering gear trapezoidal copper bar between the upper planes of the left gaugeand the right gauge is regarded as a qualified product, otherwise, regarding the steering gear trapezoidal copper bar as an unqualified product. The steering gear trapezoidal copper bar detection gauge is a convenient, quick and precise measuring tool, shortens the measurement time, and provides a combined detection tool for combined production.

The invention discloses a method and system for detecting the influence of combustion chamber machining parameters on emission based on big data, and the technical scheme is that the method comprises the steps: constructing a diesel engine combustion model, selecting different piston combustion chamber processing parameters for simulation calculation, and obtaining a simulation result; analyzing the simulation result to obtain the influence rule of the change of each parameter on the NOx emission consistency; calculating a key parameter processing threshold according to the rule; obtaining key machining parameter data, and determining the machining parameter distribution range through a big data tool; the method comprises the following steps: firstly, constructing a diesel engine combustion model, calculating and obtaining an influence rule of each parameter on emission, and processing collected processing data based on the emission rule and in combination with a big data theory to obtain a processing parameter tolerance threshold so as to detect the processing quality of the diesel engine combustion chamber.

The invention discloses a card bearing platform applied to an intelligent card slot milling machine and the intelligent card slot milling machine, and belongs to the technical field of intelligent card manufacture, wherein the bearing platform includes a bearing plate and a bottom seat. The bearing plate is provided with an upper surface used for placing the card. The bottom seat is located belowthe bearing plate. A gap is between the bottom seat and the bearing plate. The bearing plate is connected with the bottom seat through a universal swing mechanism. According to the card bearing platform applied to the intelligent card slot milling machine, the card on the slot milling machine can be made to obtain stable and accurate clamping, the slot milling precision of the card can be ensuredto meet requirement, and meanwhile, the production efficiency of the slot milling machine can also be improved.