36results about How to "Stable flatness" patented technology

The present invention is a wafer polishing method including simultaneously polishing both surfaces of a wafer by pressing and rubbing the wafer, while holding the wafer with: a lower turn table having a flat polishing-upper-surface rotationally driven; an upper turn table having a flat polishing-lower-surface rotationally driven, the upper turn table being arranged with facing to the lower turn table; and a carrier having a wafer-holding hole for holding the wafer, wherein the polishing is performed while measuring a thickness of the wafer through a plurality of openings provided between a rotation center and an edge of the upper turn table or the lower turn table, and switching a polishing slurry with a polishing slurry having a different polishing rate during the polishing of the wafer. As a result, there is provided a wafer polishing method that can manufacture a wafer having a high flatness and a high smoothness at high productivity and high yield.

Disclosed is a unique and improved substrate holding technique in accordance with an aspect of which there is provided a substrate holding system having a chuck for vacuum attraction and electrostatic attraction of a substrate, and including a ring-like rim for carrying a substrate thereon, a plurality of first protrusions disposed inside the rim, for carrying the substrate thereon, and a plurality of second protrusions disposed inside the rim, for carrying the substrate thereon, wherein a substrate carrying surface area of at least one first protrusion is smaller than a substrate carrying surface area of at least one second protrusion and wherein a smallest interval of the first protrusions is smaller than a smallest interval of the second protrusions.

The invention relates to a method for machining automobile engine large chain wheels. The method is characterized by including the following steps that uncoiling, straightening, and fine blanking are performed to form parts, wherein multiple taper holes are formed in the circumferential direction of each part, a shaft hole is formed in the center of each part, and the shape of each part is in a tooth shape; whether hard scratches exist on the surfaces of the parts or not is checked, then the products without the scratches are selected for cleaning, and it is guaranteed that residual water drops, corrosion and fine blanking oil do not exist; the parts are installed in a double-end-face grinding machine for surface coarse grinding; chamfering machining is performed on the two faces of tooth parts of the parts; burrs generated by the chamfering machining are removed; high-frequency quenching heat treatment is performed; shot blasting machining is performed; single-face accurate grinding is performed on the surfaces of the parts; the parts are placed into the double-end-face grinding machine again for surface accurate grinding; countersink milling machining is performed on the shaft holes formed in the centers of the parts; burr removal is performed; demagnetization is performed; cleaning, packaging and warehousing are performed. The method not only can meet the requirements for size precision and position precision of the products, but also enables the machining technology of the parts to be in the simplest and optimal state, and machining cost is reduced.

A micro channel structure includes a substrate, a supporting layer, a valve layer, a second insulation layer, a vibration layer and a bonding-pad layer. A flow channel is formed on the substrate. A conductive part and a movable part are formed on the supporting layer and the valve layer, respectively. A first chamber is formed at the interior of a base part and communicates to the hollow aperture. A supporting part is formed on the second insulation layer. A second chamber is formed at the interior of the supporting layer and communicates to the first chamber through the hollow aperture. A suspension part is formed on the vibration layer. By providing driving power sources having different phases to the bonding-pad layer, the suspension part moves upwardly and downwardly, and a relative displacement is generated between the movable part and the conductive part, to achieve fluid transportation.

The invention discloses a special clamp for CNC machined groove. The clamp comprises a bottom frame and a clamp main board, wherein the bottom frame is delta-shaped; one side of the raised part in the middle of the bottom frame extends outward to form a supporting plate; the clamp main board is arranged on the side surface of the other side of the raised part; the clamp main board is T-shaped; the clamp also comprises three fixing units and three positioning units; the fixing units specifically comprise press blocks and M10 fixing screws; the press blocks are fixed on the bottom frame through the M10 fixing screws; each positioning unit specifically comprises two positioning pins. The clamp has the advantages that the integrated design and the positioning mode of the clamp are adjusted, positioning of holes and shapes are integrated in the clamp, three machining processes are accomplished on one clamp, the positioning mode of the holes is accomplished through the two positioning pins at opposite angles, the planeness stability of workpieces is properly controlled, the difficulty in machining of the groove is solved, and the machining precision and the production efficiency are improved.

A semiconductor device fabrication method according to the invention comprises the steps of: (1) exposing a silicon layer by removing a portion of an insulating layer above a projected part of the silicon layer, the insulating layer covering the silicon layer; and (2) chemically and mechanically polishing the exposed silicon layer with a polishing slurry for the silicon layer while protecting the silicon layer with the remaining of the insulating layer.

The invention relates to a ratproof butterfly optical cable and a preparation method thereof. The ratproof butterfly optical cable comprises a sheath I, a sheath II, an optical fiber, and reinforcing members. Each of the sheath I and the sheath II is provided with two symmetrical flanks and a groove formed between the flanks. The optical fiber is disposed in the center of the ratproof butterfly optical cable, and a number of optical fiber cores is 2n, and n is a positive integer. The reinforcing members are disposed in the sheath II, and are symmetrically disposed on the two sides of the optical fiber. The preparation method comprises steps of S1, material drying and mixing, S2, sheath forming, S3, cable cooling, and S4 finished product take-up. The ratproof butterfly optical cable and the preparation method have advantages of good ratproof effect, low costs, and small stimulation.

The invention relates to the technical field of switch cabinets, in particular to a GCS low-voltage draw-out type switch cabinet with moisture-proof performance, which comprises a supporting structure, a sealing structure, a storage structure, an accommodating structure, a protection structure and a transmission structure, the arrangement of the sealing structure facilitates the sealing of the supporting structure, and the arrangement of the supporting structure facilitates the adjustment of the flatness of the accommodating structure in the same direction, thereby greatly improving the installation efficiency and quality of the accommodating structure. The protection structure can abut against the storage structure, the storage structure can be protected conveniently through the protection structure, misoperation of a rotary knob in the storage structure is effectively prevented, meanwhile, the storage structure is conveniently limited, and the stability of the storage structure is improved; and the transmission structure is conveniently driven through the protection structure, so that the transmission structure drives the storage structure to abut against the accommodating structure, the sealing performance between the storage structure and the accommodating structure is better, and the moisture-proof performance is greatly improved.

A manufacturing method of micro channel structure is disclosed and includes steps of: providing a substrate; depositing and etching to form a first insulation layer; depositing and etching to form a supporting layer; depositing and etching to form a valve layer; depositing and etching to form a second insulation layer; depositing and etching to form a vibration layer, a lower electrode layer and a piezoelectric actuating layer; providing a photoresist layer and depositing and etching to form a plurality of bonding pads; depositing and etching to from a mask layer; etching to form a first chamber; and etching to form a second chamber.

The invention discloses a stress relief stamping die, a stress relief stamping method and a metal plate stamping part. The stress relief stamping die is used for stamping a convex hull on a plate bodyof a metal plate and comprises a male die and a female die, the male die comprises a pressing head protruding towards the female die, the female die comprises a forming cavity corresponding to the pressing head, the forming cavity and the pressing head are matched to form the convex hull, the male die comprises a step surrounding the periphery of the pressing head, and the female die comprises astep groove surrounding the periphery of the forming cavity. The step surrounding the periphery of the pressing head is arranged on the male die, and the step groove surrounding the periphery of the forming cavity is arranged on the female die, so that during stamping, a circle of externally convex step part can be formed on the periphery of the convex hull of the metal plate stamping part, so that the internal stress between the convex hull and the plate body is sheared, the deformation of the plate body caused by relief of the internal stress is effectively limited, the stability of the flatness is guaranteed, and the stable operation of equipment is facilitated.

The invention provides a modelling quality control method of a decorative surface. The method comprises the following steps of A) examining and verifying construction drawings, finding out a circle centre of a surface model, decomposing an irregular surface into a plurality of circles, and determining the circle centre, a radius, an arc length and a positioning coordinate; B) decomposing and optimizing the surface model by using computer aided design (CAD), wherein field sizes and paying-off is required to be in accordance with the designed drawings strictly; using a computer to assist the paying-off, so that precision can be ensured; and C) inspecting and checking quality for nodes constructed on a cambered surface, and reducing unnecessary dimensional deviations. The flatness of the cambered surface is ensured, and firmness and construction quality are ensured. By the method disclosed by the invention, the stability and firmness of the steel structure foundation of the surface model, and the flatness and radian of the cambered surface meet the specified requirements. Impression effects meet a predetermined aim, the percent of pass is above 95%, and secondary rework is avoided.

The invention relates to a forming mold, a vulcanizing machine and a rubber part forming method. The forming mold is used for forming a rubber part with a framework and comprises a first mold plate, a second mold plate and a forming body; the second mold plate is arranged below the first mold plate; the forming body is provided with a through hole which is communicated up and down, and the inner wall of the through hole is provided with a plurality of grooves; in the mold closing state of the forming mold, the forming body integrated, and the through hole, the grooves, the first mold plate and the second mold plate form a cavity which is used for containing injection raw materials; and in the demolding state of the forming mold, the forming body is split so as to be separated from a finished product. The rubber part with convex ribs can be formed, the structure is simple, the forming cost is reduced, operation is convenient, and the production efficiency is improved.

A single-use means for preparing a beverage from an infusible product, containing a bendable sheet-like base with a designated bend line, and a moisture-permeable bag for brewing a product, wherein the bag has an upper portion attached by one side to the sheet-like base, and an unattached lower portion, wherein the sheet-like base and the bag are designed and mutually arranged such that the sheet-like base can cover a vessel containing a liquid, in which the bag is immersed during the brewing of a product, and such that the product can be squeezed after brewing by bending the sheet-like base and pressing the bag from two opposing sides using the bent sheet-like base, wherein to allow more careful squeezing of an infusion from the product in the bag after brewing, the region in which the attached side of the upper portion of the bag is attached to the sheet-like base is situated along a line that intersects the bend line of the sheet-like base, wherein the line along which the attachment region of the bag is situated substantially coincides with the bend of the bag in its suspended state on the base during use.

The embodiment of the invention provides an assembly system, an adsorption jig and an assembly method for a battery cover, and relates to the field of part assemblies. The assembly system comprises the structure that a base jig comprises a placing area used for placing the battery cover; the adsorption jig comprises a target area and a power mechanical part, wherein the target area imitates the battery cover; and the adsorption jig is driven by the power mechanical part to press and correct the battery cover on the base jig. The battery cover is pressed and corrected in the base jig through the adsorption jig, the condition that the flatness of the battery cover can be kept stable after hot press molding is ensured, the problem that the flatness of the battery cover rebounds and deviates from edge finding positioning of a middle frame, so that a gap exists in the whole machine is solved, and the edge finding positioning accuracy of the battery cover is improved.