96results about How to "Improve hole position accuracy" patented technology

A laser machining method and a laser machining apparatus superior in hole position accuracy and hole quality. An outgoing beam outputted as short pulses is shaped by a pulse shaping unit so as to form a #1 branch beam. The #1 branch beam is supplied to a portion to be machined, so as to machine the portion. In this case, the #1 branch beam may be controlled to synchronize with the outgoing beam. When a piece to be machined is made from a metal material and at least one of an organic material and an inorganic material, the metal material is machined with a laser beam shaped to have a pulse width not shorter than 100 ns, and at least one of the organic material and the inorganic material is machined with a laser beam shaped to have a pulse width shorter than 100 ns.

To provide a far more practical drilling tool that is capable of drilling holes having good hole position accuracy and hole wall roughness using a small-diameter drill of 0.4 mm or less. A drilling tool in which helical chip-evacuating flutes (2) are formed in the outer circumference of a tool main body (1), wherein the chip-evacuating flutes (2) have a first helical region (3) with a first helix angle +- 1 and a second helical region (4) with a second helix angle +- 2 greater than the first helix angle +- 1 , being provided on the tool base side of the first helical region (3); the tool main body 1 has a first taper region (6) with a first web taper and a second taper region (7) with a second web taper smaller than the first web taper, being provided on the tool base side of the first taper region (6); and a portion (8) where the first taper region (6) and the second taper region (7) are connected in a row is located more toward the tool base side than the portion (5) where the first helical region (3) and the second helical region (4) are connected in a row.

The invention relates to the technical field of capacitor preparation, in particular to a fully automatic nailing and winding integrated machine. The automatic nailing and winding integrated machine comprises a foil conveying mechanism, a needle conveying mechanism, a nailing mechanism, a winding mechanism and a cutting mechanism, and the nailing mechanism only needs to move the mold assembly to be movable in the first direction And the movement of the molds on the mold assembly in the second direction can complete the nailing of the guide pins and the foil strips without changing the positionof the foil strips, omitting the foil-rolling wheel, and avoiding the foil-feeding wheel during the transmission process The error caused by the change of the tension improves the precision of the hole position of the first nailing hole and the second nailing hole, ensures the quality of the nailing, and improves the yield of the automatic nailing and winding machine.

The invention relates to a structure for connecting a swing arm lining with a sub vehicle frame. The inner framework of the swing arm lining is flat; the two ends of the swing arm lining are protruded out of a middle rubber body and a lining outer pipe; a bolt hole is formed in each of the two ends of the swing arm lining; a through hole is formed in a sub vehicle frame; a threaded casing pipe is arranged in the sub vehicle frame; the bolt holes, the through hole and the threaded casing pipe are communicated with one another; a sink which is toward the inner side is formed in the part, corresponding to each of the middle rubber body and the lining outer pipe, on the sub vehicle frame; the swing arm lining is fixedly connected with the sub vehicle frame in the way that a bolt is matched with the threaded casing pipe. In the technical scheme, due to the fact that the sub vehicle frame is flatly stuck to the inner framework, abnormal sound caused when the inner framework of the swing arm lining moves in the manner of being relative to a gear-starting structure is avoided, and the promotion of NVH (Noise Vibration and Harshness) is benefited; due to the fact that secondary welding of the frame is not required, the rigidity of a mounting part is high, and meanwhile, the mounting space is saved; due to the fact that the sub vehicle frame is molded by drilling and casting a complete plate, the drilling precision is high, and the production is easy to control; due to the fact that the threaded casing pipe is adopted, the assembling process is simple.

The present invention relates to an entry sheet for drilling use, which exhibits excellent hole position accuracy even when transported at ambient temperature for a long time and/or stored under a thermal environment having a higher temperature than in Japan, more specifically to an entry sheet for drilling use for a laminated board or a multi-layered board comprising a metallic support foil and a layer of water-soluble resin composition formed on at least one surface of the metallic support foil, wherein the water-soluble resin composition comprises a water-soluble resin, a water-soluble lubricant and a linear unsaturated fatty acid salt, the layer of water-soluble resin composition is formed by cooling from a cooling start temperature of 120° C. to 160° C. to a cooling end temperature of 25° C. to 40° C. within 60 seconds at a cooling rate of not less than 1.5° C./sec, the water-soluble resin composition has a degree of crystallinity of not less than 1.2, the layer of water-soluble resin composition has a standard deviation σ of surface hardness of not more than 2, and a surface hardness of not less than 8.5 to not more than 25 N/mm².

The invention discloses a benchmark selection method for minimizing hole position errors of large component group hole machining, which comprises the following steps of: 1) determining the type of a numerical control machine tool, and establishing a topological structure of the numerical control machine tool; 2) establishing a theoretical pose model of a tool nose point in the movement process; 3)establishing a hole site error model; 4) establishing a hole site average error model of group hole machining; and 5) obtaining the machining reference of the corresponding component group holes. According to the method, different benchmark selection principles are provided for aircraft component framework and skin group hole machining, the position precision of framework or skin group hole machining can be effectively improved, and meanwhile a more scientific and reasonable method is provided for selection of a large component group hole machining benchmark; by calculating the average valueof the hole site errors of a certain point in the space points and the hole sites of the group holes, the reference with the minimum hole site error is deduced, and the method is more scientific and reasonable; the method can also be applied to other numerical control machining fields and is suitable for wide popularization and application.

The invention belongs to the field of manufacturing process of printed circuit boards and particularly discloses a manufacturing method of ultralarge line-card type printed circuit boards with large layer number and high alignment degree. The manufacturing method includes steps of (1) providing an inner substrate; (2) punching pressed positioning holes; (3) pressing; (4) drilling holes; (5) electroplating; (6) paving outer liners; (7) printing in solder resist; (8) forming. The manufacturing method solves the problems of poor interlayer alignment and low accuracy of hole sites and patterns of finished products of the ultralarge line-card type printed circuit boards with high alignment degree and successfully develops ultralarge line card type products with large layer numbers and high alignment degree. The manufacturing method is simple and feasible, interlayer alignment and hole site accuracy of the ultralarge line-card type printed circuit boards with large layer number and high alignment degree can be greatly improved, and product demands are met.

The invention discloses a formation method for an irregularly-shaped hole of a printed circuit board. The formation method comprises the steps of drilling at least two first pre-drilling holes in an Ahole reservation position; drilling at least two second pre-drilling holes in a B hole reservation position; respectively drilling remaining parts at the reservation positions according to the shapesand the sizes of the A hole and the B hole so that the A hole and the B hole intersect and the irregularly-shaped hole is formed. According to the formation method for the irregularly-shaped hole ofthe printed circuit board, provided by the invention, hole formation can be prevented, and the hole accuracy of the irregularly-shaped hole can be improved.

The invention discloses an environment-friendly light sound insulation pad which is of a three-layer structure comprising a sound absorbing layer, a sound insulation layer and an elastic layer in sequence from top to bottom. The elastic layer makes contact with a car body metal plate. The invention further discloses a production method of the environment-friendly light sound insulation pad. The production method comprises the steps that the sound insulation layer is cut, and arc discharge processing is carried out on the sound insulation layer; the sound absorbing layer is heated; a semi-finished blanket is placed on a lower die of a sucking, foaming and punching integrated die to be positioned; the sound insulation layer is heated in a radiation mode; the sound insulation layer is sucked to the semi-finished blanket placed on the lower die of the sucking, foaming and punching integrated die; the surface skin of the sound insulation layer is heated and molten, an upper die and the lower die are closed, isocyanate and premixed polyether polyols are poured to the sound insulation layer, and the sound insulation layer forms the elastic layer; after die opening, the product is taken out. By the adoption of the structure, the weight of a single environment-friendly light sound insulation pad is reduced, the whole sound insulation level of the single environment-friendly light sound insulation pad is improved, the noise in the whole car is lowered, the product hole site precision is high, and the environment-friendly light sound insulation pad has the advantages of being low in odor intensity, low in VOC discharge and the like.

The invention relates to a nano niobium aluminum yttrium nitride/amorphous silicon nitride dual-phase ultra-hard coating and a deposition method thereof. The ultra-hard coating is of a four-layer structure, wherein the innermost layer is a pure niobium bonding layer, and thickness of the innermost layer is 0.05-0.5 micron; the secondary inner layer is a niobium nitride transition layer, and the thickness of the secondary inner layer is 0.05-1 micron; the secondary outer layer is a gradient layer, component of the niobium nitride is gradually reduced from inside to outside, and components of the niobium aluminum yttrium nitride/the silicon nitride are gradually increased, the thickness of the secondary outer layer is about 0.1-1.0 micron, and concentration on a stress interface can be prevented; and the outermost layer is composite wear-resistant layer of the niobium aluminum yttrium nitride/the silicon nitride, the thickness of the composite wear-resistant layer is 1-10 microns. The total thickness of the coating is 1.2-12.5 microns. Binding force of the coating and a hard alloy matrix reaches 70-105 N, hardness of the coating is 40-60 GPa, friction coefficient of the coating is 0.20-0.55, antioxidant temperature of the coating is 750 DEG C or higher, and service life of a coated micro drill or milling cutter is prolonged by 4-8 times compared with that of an uncoated micro drill or milling cutter.

The invention discloses a processing process for connecting pipes. The processing process comprises the following steps of 1, material preparation: an aluminum pipe is sawed and cut into small sections of aluminum pipes on a sawing machine according to the drawing dimension; 2, finish turning: the end surface, the excircle and the inner hole of the aluminum pipes are subjected to finish turning on a numerically controlled lathe according to the drawing dimension; 3, finish milling: the side edge, the positioning hole and the side hole of the aluminum pipes are subjected to finish milling according to the drawing dimension; 4, deburring: all burrs of workpieces are removed; and 5, surface treatment: the workpieces are treated by yellow chromate. Through the adoption of the mode, the processing process can reduce the processing difficulty of the connecting pipes, the production efficiency is improved, and a special tooling is used, so the processing precision is improved, and the qualified rate of products is improved.

The invention relates to a hot extrusion die and a hot extrusion overall forming method of a special-shaped square pipe, and belongs to the fields of an extrusion forming technology and a special-shaped material manufacturing technology. The problem that in the prior art, the special-shaped square pipe cannot be prepared with a hot extrusion overall forming method is solved. The hot extrusion overall forming method of the special-shaped square pipe includes the steps that 1, a blank is heated and broached; 2, the broached blank is heated at a second time; 3, the blank is subjected to hot extrusion through the hot extrusion die of the special-shaped square pipe; and 4, the special-shaped square pipe obtained after hot extrusion forming is air-cooled to room temperature, and the surface quality and the mechanical performance of the special-shaped square pipe are checked. The prepared special-shaped square pipe is good in surface quality and high in dimensional precision, all performanceindexes meet the design requirements through physical and chemical analysis and mechanical performance testing, and the overall quality meets the industrial use requirements.

The invention discloses a cover plate for PCB drilling. The cover plate comprises an original cover plate and an adhesive resin layer on the back of the original cover plate. According to the cover plate for PCB drilling, the back of the original cover plate is added with the adhesive resin layer, accordingly, the cover plate can be firmly attached to the surface of a to-be-drilled PCB plate in the using process, a clearance between the cover plate and the to-be-drilled PCB plate is prevented from being produced, and the cover plate and the to-be-drilled PCB plate are integrally formed. Burr to be appeared on the surface of the PCB plate is transferred to be on the surface of the cover plate, and the clearance between the cover plate and the PCB plate is prevented from being produced; accordingly, the hole position precision is improved, the chip discharging effect is improved, and meanwhile the cover plate is inhibited from moving relatively on the surface of the PCB plate.

The invention discloses a PCB-drilling micro-bit, comprising an base line at the bottom of the groove and two side lines respectively arranged at both sides of the groove and smoothly connected with the base line, which is characterized in that: a spiral winding groove is arranged on the prismatic face; the cross-section profile vertical to the spiral line of the groove is U-shaped with wide bottom on the whole; wherein, the base line is a straight line segment or a circular arc line segment with large curvature radius; the two side lines are respectively straight line segment or circular arc line segment with small curvature radius. Optimally, Helix angle of the groove is 42 to 45 degrees. The invention has the advantages of having bigger space for removing chips and bigger core radius synchronously through optimizing the groove, not decreasing the width of the groove with the groove becoming shallower, having more reasonable groove amplitude ratio of the rear part in the drill bit, improving the quality of drill wall, the hole accuracy, lowering rod-breaking performance synchronously; by increasing the helix angle to 42 to 45 degrees, the invention improves the dust exhausting ability of the drill bit and the quality of hole wall.

An entry sheet for drilling comprising: a metallic foil; and a layer of a resin composition on at least one surface of the metallic foil, the resin composition comprising a polyolefin resin (A) and a water-soluble resin (B), wherein a content of the polyolefin resin (A) is 25 parts by mass or more and 50 parts by mass or less based on 100 parts by mass of the total of the polyolefin resin (A) and the water-soluble resin (B), a content of the water-soluble resin (B) is 50 parts by mass or more and 75 parts by mass or less based on 100 parts by mass of the total of the polyolefin resin (A) and the water-soluble resin (B), and the water-soluble resin (B) comprises a high-molecular-weight water-soluble resin (B-1) having a weight average molecular weight of 2×10⁵ or higher and 1.5×10⁶ or lower.

The invention discloses a waterborne polyurethane coating for coated aluminum sheets and a preparation method of the waterborne polyurethane coating. The waterborne polyurethane coating comprises thefollowing components: 10-50 parts of water-soluble polyurethane resin, 5-40 parts of hot-melt resin, 2-30 parts of lubricating resin, 0.15-0.5 part of an adhesion promoter, 0.001-0.005 part of a PH regulator, 0.15-0.4 part of a defoaming agent, 0.06-0.3 part of a humectant and 20-80 parts of a solvent. The preparation method at least comprises the following steps: preparing a solvent according toan alcohol-water ratio of 8:2-3:7; sequentially stirring the water-soluble polyurethane resin with the hot-melt resin, the lubricating resin, the adhesion promoter, the PH regulator and the humectantin the solvent with a certain proportion until the materials are complete dissolved, slowly adding the defoaming agent, and continuing carrying out stirring for 30 minutes or more to prepare the waterborne polyurethane coating for the coated aluminum sheets. The waterborne polyurethane coating provided by the invention is applied to the coating of aluminum sheets, and the coating layers of aluminum sheets coated with the waterborne polyurethane coating provided by the invention have the effects of buffering, positioning, heat dissipation and lubrication, can solve the drilling processing problems of micro holes and dense holes, increase the hole-location accuracy, increase the drilling lamination number, improve the production capacity, avoid the quality problems such as hole plugging, film falling of the aluminum sheets, and the like, and has the advantages of good environmental resistance and convenient storage.

The invention discloses a turn-to-turn insulation manufacturing method for a rotor of an inner air-cooled steam-turbine generator. According to the technical method, turn-to-turn filler strip long holes and circular holes are formed automatically through special equipment, thereby realizing high accuracy and high production efficiency. After bonding, the first pass yield of a product is high, and the defects of low efficiency, damages to copper wires, production of metal burrs and the like in an original machining process are overcome.