72results about How to "Reduce processing stress" patented technology

The invention discloses a chemical mechanical polishing solution for processing a surface of a sapphire or carborundum wafer for an LED (Light Emitting Diode) substrate slice. The chemical mechanical polishing solution comprises the following raw materials by weight: 2 to 30% of grinding material, 0.01 to 5% of chelating agent, 0.01 to 10% of surface active agent, 0.01 to 10% of dispersing agent, 0.1 to 20% of oxidant and the balance of deionized water. The preparation method comprises the steps as follows: preparing a grinding material-silica sol; then, sequentially adding the chelating agent, surface active agent, dispersing agent, oxidant and deionized water to the obtained silica sol along with agitating; and continuously uniformly agitating to obtain the chemical mechanical polishing solution for processing the surface of the sapphire or carborundum wafer for the LED substrate slice. The chemical mechanical polishing solution disclosed by the invention can not bring damage, scratching and corrosive pits to the surface of the LED substrate and has no pollution to the environment; the raw materials are cheap, and the cost is low; and the chemical mechanical polishing solution is suitable for industrial production.

The invention discloses a method for turning middle and small thin-wall element, wherein the invention uses auxiliary clamper on general turning machine, first based on the outer diameter of element, produces a slim sheath with same diameter and middle slim as auxiliary clamper, machines the blank of object element, then puts the draw-in gear into the inner hole of slim sheath, puts them together into three-claw positioning clamping disc of turning machine, clamping and machining roughly and finely, and since the invention uses slim sheath as auxiliary clamper, the long-disc claw can obtain uniform dispersed clamping force on the surface of object element, to reduce unit clamping force, reduce vibration and deformation or the like. And the invention improves efficiency via transferring thin-wall element on three-claw automatic positioning clamping disc.

The making process of circular polarization maintaining fiber includes deposition process to make core rod and stress rod with preserved coating, machining mechanically the matched sides of the core rod and the stress rod to reach the matching interval requirement, machining mechanically the inner hole of quartz casing for fitting the combined cross section of the core rod and the stress rod, setting the machined core rod and stress rod into the quartz casing for matching tightly to constitute prefabricated rod for circular polarization maintaining fiber, drawing, cleaning, and re-drawing to form fiber. The making process has high precision, high product quality and powerful adaptability, and is suitable for mass producing circular polarization maintaining fiber product.

Aiming at solving the problem of the failure of the product for the volume of the head part is too big, the weight is too heavy, the temperatures of the disk part and the second hot point are too high because the heat capacity is a little higher when an engine operates, the diameter of the second hot point is too small, the mechanical strength of the second hot point is poor, the heat transfer distance between the head part and the rod part is too far, the cooling of the second hot point is poor, the strength of the neck part is poor and the like existing in the present B series engine valve. The invention provides a gas inlet valve and a gas outlet valve of the engine and a process for manufacturing the same. The process has the advantages of improving the structure of the gas valve, optimizing the machine procedure, reducing the processing stress and improving the processing precision.

The invention discloses a common-reference detection and machining method of an off-axis three-mirror aspheric optical system. The method includes: firstly, machining of a main reflecting mirror and a third reflecting mirror are respectively performed until the RMS value of the full-aperture interference detection surface shape of each single reflecting mirror is greater than 1 / 10[Lambda], wherein Lambda refers to the laser interferometer operating wavelength; secondly, according to design parameters, an integrated backboard used for fixing the main reflecting mirror and the third reflecting mirror is designed and machined; thirdly, the main reflecting mirror and the third reflecting mirror are fixedly arranged on the integrated backboard, common-reference detection of the main reflecting mirror and the third reflecting mirror is performed, and the surface shapes of the main reflecting mirror and the third reflecting mirror are respectively obtained; fourthly, based on the surface shapes of the main reflecting mirror and the third reflecting mirror, which are obtained by common-reference detection, ion beam machining of the main reflecting mirror and the third reflecting mirror fixed on the integrated backboard is performed according to the design requirement; and fifthly, common-reference detection of the main reflecting mirror and the third reflecting mirror after ion beam machining is performed until the design requirement is satisfied. According to the method, the complicated assembling and adjusting processes of the off-axis three-mirror aspheric optical system can be avoided.

An objective of the invention is to provide a sealing method which has high reliability and practicability and is used between the high-temperature thermal-collecting tube hard glass and the metal. The method adopts one or more than one transition glass joint to do transition sealing, the expansion factor of the hard glass, transition glass joint and the kovar which are sealed in sequence gradually increases, the difference value of the expansion factor of the adjacent two sealing pieces is (6- 11)* <-7> / DEG C; when the adjacent two sealing pieces are sealed the heating temperature of the sealing area is 500-1500 DEG C, and the temperature is kept for 5-30min; from the hard glass to the kovar the heating temperature of each sealing area is 50-300 DEG C; and the hard glass, transition glass joint and the kovar which are executed with sealing are done with stress-relieving annealing.

A display substrate includes a base substrate, a switching element, a gate line, a data line and a pixel electrode. Each of the gate line and the data line includes a first metal layer, and a second metal layer directly on the first metal layer. The switching element is on the base substrate, and includes a control electrode and an input electrode or an output electrode. The control electrode includes the first metal layer and excludes the second metal layer, and extends from the gate line. The input electrode or the output electrode includes a second metal layer and excludes the first metal layer. The input electrode extends from the data line. The pixel electrode is electrically connected to the output electrode of the switching element through a first contact hole, and includes a transparent conductive layer.

The invention discloses a method for turning a large-diameter precision complex molded surface thin sheet part and belongs to the technical field of machining. The method comprises the following steps that (1), it is ensured that the part leakage length is greater than or equal to a half of the width of the whole part, and the molded surface of the outer side of the first surface of the part is turned, namely a half of the molded surface of the outer side of the first surface of the part; (2), the molded surface of the inner side of the first surface of the part is turned, and smooth adaptation connection between a connection knife and the molded surface is noticed; (3), the molded surface of the outer side of the second surface of the part is turned, namely one third of the molded surface of the outer side of the first face of the part; (4), turning of part of the molded surface of the middle of the second surface of the part is finished under the state that the inner side and the outer side are compressed at the same time; and (5), machining of the molded surface of the left of the second surface is finished, smooth adaptation connection between the connection knife and the molded surface is noticed, and the whole machining process is finished. The technical bottleneck of turning of thin-walled sealed washers of high-precision, novel-structure and precision complex molded surfaces is effectively solved, and the far-reaching significance is achieved for improvement of the manufacturing technical level of a new generation of engines.

The invention discloses an impeller locking device for a centrifugal compressor, and belongs to the field of compressors. The impeller locking device comprises an impeller, a main shaft, a base, a keyand a locking nut. An impeller keyway is arranged on the inner wall of the shaft hole of the impeller, and a main shaft keyway corresponding to the impeller keyway is arranged on the outer surface ofthe main shaft, and the radial cross sections of the impeller keyway and the main shaft keyway are smooth curves. The main shaft includes a threaded end and a shoulder end, wherein the threaded end is provided with an external thread, the shoulder end is provided with a shoulder, and the base is provided with a seat body and hydraulic jacks. The middle part of the seat body is provided with an action ring applying force on the locking nut, and the hydraulic jacks are symmetrically disposed on both sides of the seat body. The top end of each hydraulic jack is fixedly provided with a top blockacting on the outer ring of the impeller, and the inner part of the locking nut is provided with an internal thread matched with the external thread. The impeller locking device has the advantages ofmore convenient locking, less damage to the locking nut and improvement of the strength of the impeller.