118 results about "Grit blasting" patented technology

A method and apparatus are disclosed for selective removal of a conformal coating from the solder balls of grid array packages such that the benefits of the coating are realized. An ancillary benefit of the invention is improved process-ability of the grid array package by improving the mechanical containment of the solder during the reflow process and improved electrical isolation between the individual solder attachment points. For example, a method for coating a ball grid array is provided, which includes coating the ball grid array with a thin layer of parylene. Next, the solder ball side of the part is butter smeared or squeegeed with a water soluble coating and assembled wet. A mask having holes in the same pattern as the balls in the grid, and a thickness that is about 80% of the height of the balls, is applied to the solder ball side of the part. This side of the part is then butter smeared again with the water soluble coating, and the entire assembly is allowed to dry. At this point, about 20% of each parylene-coated solder ball protrudes higher than the surface of the mask. The solder ball side of the part is then grit blasted with an abrasive material. The extent that the abrasive material removes the parylene coating from the solder balls is limited by the mask and the layer of water soluble coating. Therefore, the grit blasting removes the parylene coating from only the protruding areas (e.g., about top 20%) of the solder balls. Water is then used to remove the water soluble coating, and the parylene coated part is baked to remove moisture. Thus, a parylene coated ball grid array (or column grid array) is provided that is highly impervious to moisture, has a very high dielectric strength, and thereby improves the electrical performance and reliability of the surface mounted part.

A pre-stressing and grit-blasting technique for shaping a double-curvature plate wall used as the thick jacket of large airplane features that a pre-stressing fixture unit is used to pre-bend a plate longitudinally and transversely and fix it for applying a pre-stress to it while the grits are blasted onto said plate for obtaining a needed shape.

The invention discloses a sand dredger filling construction method of a soft soil foundation embankment. The sand dredger filling construction method comprises the steps of: (1) cleaning the surface of an embankment dredger filling field; (2) measuring and lofting, and setting an elevation mark of the dredger filling construction in a dredger filling region; (3) performing the dredger filling work in a manner of segmenting and layering, to be specific, forming a cofferdam, establishing plastic water discharge plates, building construction roads, distributing grit blasting pipe lines, dredger-filling the embankment, constructing a drain opening, and constructing water collecting wells; and (4) performing stability observation and settlement observation on the dredge-filled sand land of the embankment. The sand dredger filling construction method disclosed by the invention has the advantages of solving the flatness problem of road area at coastal tidelands, rivers, fishponds and the like, performing roadbed filling of municipal administration by fully making use of the characteristics of abundant fin sand resource in the local area, reducing exploitation usage amount of the land resource, decreasing construction cost while guaranteeing construction quality of the roadbed, being simple, convenient, feasible, efficient and practical, increasing working efficiency, saving cost and creating conditions for advanced construction of the next procedure.

The present invention relates generally to a new method for improving the reliability of cooling designs using thermal paste to cool chips in semiconductor modules and structure thereof. More particularly, the invention encompasses a structure and a method that uses surface chemistry modification of the inside of the thermal cooling caps where it contacts thermal paste. The internal surface of the cap is modified by embedding particles that have the same chemical composition as one or more of the solids used in the thermal paste. The particles may be embedded in the cap by casting, grit blasting, or pressing the particles permanently into the surface.

The invention relates to a precise forging method for a CoCrMo alloy artificial joint. The method comprises the following steps: carrying out blanking and blank making so as to obtain a forging blank material; subjecting the blank material to forging and correction; and finally, carrying out polishing and grit blasting so as to obtain a CoCrMo alloy artificial joint forging. The invention has the following advantages: an appropriate forging temperature range for the CoCrMo alloy artificial joint is determined for the first time, remelting and heat preservation are carried out after forging and correction, so the CoCrMo alloy forging has god strength matching with plasticity.

The invention belongs to the technology of high temperature surface protection, and particularly relates to a preparation method of a high-temperature abradable sealing coating. The high-temperature abradable sealing coating comprises a bonding bottom layer, an oxygen barrier layer, a thermal insulation layer, and an abradable surface layer; the abradable surface layer comprises the following components by weight: 80%-95% of ZrO2, 5%-15% of polyester, and 0.5-5% of hBN; spraying powder is prepared by a high-energy ball milling method and is kept in reserve; before spraying of a workpiece surface, the workpiece surface is pretreated by grit blasting, and then each layer is prepared respectively by thermal spraying technology. The coating deposition efficiency is high, and the cost is low. Meanwhile, the coating has high thermal insulation performance, antioxidation performance, and abradability; the thermal cycle life of the coating at 1150 DEG C is up to more than 150 cycles, and the thermal shock life at 1150 DEG C is up to more than 1000 shocks; the structure-abradable sealing coating has a service temperature of up to 1200 DEG C.

The present invention relates to the technical field of metal surface treatment, in particular to a stainless steel surface treatment method, which includes the steps of: S1: performing shot blasting treatment on the stainless steel surface to be treated; S2: performing sandblasting treatment on the stainless steel surface after shot blasting treatment ; S3: Electrolytic polishing is performed on the surface of the stainless steel after sandblasting. The steps of shot blasting, sand blasting and electrolytic polishing are used to treat the surface of stainless steel, which can overcome the defects such as spots and cracks on the base material that are difficult to handle in the stainless steel products of the prior art section steel, and the defects such as fingerprint resistance in the prior art .

The invention relates to a processing technique for a straight bevel gear and aims to provide a molding process for a straight bevel gear in order to improve the forging processing precision and processing efficiency of the bevel gear. The molding process comprises the following steps: (1) tooth die modeling includes rough forging tooth die modeling and finishing tooth die modeling; the pitch circle chordal tooth thickness of the rough forging tooth die is slightly smaller than that of the finishing tooth die, and the tooth whole depth of the rough forging tooth die is larger than the tooth whole depth of the finishing tooth die; the single tooth profile volume of a 0.992 rough forging tooth equals to the product of the single tooth profile volume of the finishing tooth die and 1.008; (2) the warm forging plastic forming is carried out; (3) hot forging edge cutting is carried out; (4) rough forged pieces are subjected to normalization, surface grit blasting and phosphorous saponification; (5) cold accurate alignment plastic forming is carried out. The processing technique for the straight bevel gear has the advantages that the quantity of raw materials is saved, the technological requirements on blank processing are lowered; the production cycle is reduced, and the cost is reduced; the product quality is stable, the product precision is high, the mechanical performance is good, the tonnage of required equipment is small, and the cost is low.

The effects of sputter re-deposition are reduced by macroscopically roughening the non-sputter areas of the sputter target. The macroscopic roughening is obtained by forming a macroscopic trough pattern in the non-sputter areas of the sputter target. A variety of patterns may be used for the trough pattern. In addition to macroscopically roughing the non-sputter areas of the sputter target, microscopic roughening of the trough patterns may be performed using conventional shot, bead or grit blasting techniques.

A modular, rotisserie type multifunctional tooling fixture assembly is disclosed. The disclosed tooling fixture assembly comprises a positioning ring having a plurality of anchor members configured or adapted to retain a plurality of workpieces to be processed, and a retaining base defining a plurality of retaining members configured to be in locking engagement with the anchor members of the positioning ring and retain a plurality of workpieces in a fixed orientation. The tooling fixture assembly has utility in various coating related processes, including coating and grit blasting operations.

The invention discloses a bidirectional injection moulding method of stator rubber of screw drilling tools, which belongs to the technical field of stator rubber injection of screw drilling tools andcomprises the following steps: grit-blasting; washing and drying; brushing adhesive; assembling a mould core into an internal hole of a steel pipe; putting a stator and an injection moulding mould inan oven and heating; carrying out vacuum negative-pressure rubber injection from two ends to the center of the stator; sealing the stator and putting the stator in a vulcanizing boiler to carry out vulcanization; taking out the stator and cooling; disassembling screw nuts, end caps and shims used for positioning on two ends of the stator, and pushing the mould core out of the rubber layer of the internal hole of the stator so as to be disengaged. The rubber injection method from two ends to the center of the stator prevents rubber from pressing the mould core to cause linear deformation of themould core, fundamentally eliminates the wrapping extent and the core shift of the rubber layer hole in the internal hole of the stator, greatly prolongs the service life of the stator, reduces air bubbles in the rubber layer of the stator and defects on the surface, such as pits, flow marks and the like and increases the qualification rate. The method overcomes the defects of low speed and longtime of rubber injection.

The invention belongs to the technical field of mining, and particularly relates to a sublevel-open-stoping-method pressure-relief stoping method for a high-dipping medium-thick ore body. The method achieves pressure-relief type stoping by means of the steps that a cut parvis is formed through blasting in groups, and then the ore body is divided into three subsections in the vertical direction of the ore body; the ore body is divided into a plurality of stopes in each subsection, and each stope is divided into I-VI rows of grouped concentrated blasting subareas to conduct blasting in groups; broken ores are formed after blasting is conducted, a route for transmitting hanging wall stress to heading wall through the ore body is cut off, and pressure-relief grooves in stair shapes are formed in the vertical direction of the ore body. In addition, through multi-group concentrated blasting, a hole-by-hole millisecond blasting detonation technology is adopted, disturbance and damage to rock mass caused by multi-group blasting of traditional operation are reduced, the blasting efficiency is enhanced, the stope room stoping period is shortened, and the ore production efficiency is enhanced.

The invention provides a metal tube taking a plastic tube as a liner and a manufacturing method of the metal tube. The metal tube taking a plastic tube as a liner comprises a metal tube and a plastic composite tube stock; the plastic composite tube stock is formed by an outer layer hot melting adhesive layer and an inner layer plastic tube; plastic composite tube stock is manufactured online, the inner wall of the metal tube is subjected to sand blasting and shot blasting or grit blasting after being polished, the plastic composite tube stock is pulled into the well-processed metal tube, and the two ends of the plastic composite tube stock are sealed and inflated and are placed in a sealed steam room or baking room to be heated, such that the metal tube and the plastic composite tube stock are adhered fixedly, and trimming and spraying are performed. The invention further comprises a manufacturing method of the metal tube taking a plastic tube as a liner. The sealed steam room or baking room is adopted for heating, the product quality is stable, and percent of pass is high; a plurality of or even different models and types of tube stocks can be heated simultaneously, the total heating time is less, the production efficiency is high, the energy consumption cost for product heating can be saved, plants and production devices for production can be saved more, and investment cost is reduced.

A method for making cylinder liners and cast engine blocks having cylinder liners having a strong mechanical bond with the engine block. The method includes providing a cast metallic cylinder liner having an outer surface of the cylinder liner. The surface of the cylinder liner is preferably machined to remove surface effects or defects present from the casting process. Grit particles are directed at the outer surface of the cylinder liner with a grit blasting device at a predetermined angle of contact at a sufficient velocity to form cavities on the outer surface. The cavities that are formed have a geometry capable of forming a mechanical bond with the casting material of the engine block.

The invention discloses a plasma spraying method for improving the endurance feature of welded structures in the invention, applied to a plasma spraying process in spraying coat on the surface of brazing seam, which is comprised the following steps: a. gritting blasting in the brazing seam of specimen; b. plasma spraying bound substratum on the surface of the brazing seam for 0.03mm to 0.07mm in thickness, the materials of which is selected form Ni/AL, Ni/Cr or McrALY, wherein the M is a transient metal as Fe, Ni, Co or NiCo; c. spraying plasma powder on the brazing seam surface as face coat for 0.8mm to 1.2mm in thickness. The invention improves the endurance feature of the welded structure in such a way of plasma spraying coats of a low elasticity modulus in the weld joint, with which the shape of the cross section can be improved, the stress concentration there can be lower and the endurance strength of the welded structure can be advanced; (b) comparing to the welding specimen, the endurance strength of the invented plasma spraying specimen increases 25.9 percent, while flame spraying specimen increases only 9.7 percent.

A glass grit blasting technology for increasing the stress corrosion resistance of the welded seam between stainless steels includes such steps as cleaning the surface of the welded seam, blasting the glass grits onto the welded seam by a blasting gun driven by compressed air and with an inclination by 70-100 deg.C, cleaning the surface of welded workpiece, and detecting the residual stress by X-ray diffractometer.

The invention relates to a plastic surface treatment technique which comprises the following steps: plastic degreasing, plastic swelling, plastic surface coarsening, primary grit blasting, spraying treatment, hole sealing treatment, secondary grit blasting (carrying out grit blasting on the plastic surface by using a high-pressure spray gun and a sand material), and water washing and drying. The treatment technique is simple, shortens the treatment time, and enhances the high-temperature oxidation resistance and corrosion resistance of the plastic; and the plastic has higher surface smoothness and is beautiful.

The invention relates to a method for preparing porous titanium and tporous titanium alloy, which is characterized in that the preparing steps are as follows: Ti powder or Ti alloy powder is baked in an oven; grit-blasting coursing pretreatment is performed on the surface of a flat shape matrix or the surface of a club-shaped matrix; the cold spraying method is used to spray the prepared Ti powder or the Ti alloy powder on the matrix; and then a coating layer gained in step three is put in a vacuum heat treatment furnace for heat treatment. The invention has the characteristics of simple technology, short production cycle and low cost. The porosity of the porous titanium and the porous titanium alloy prepared by the method is distributed evenly with good controllability. The porosity of the porous titanium and the porous titanium alloy prepared by the method can be changed in the range of between 5 and 50 percent, and the intensity can be changed in the range between 30 and 75 MPa according to the porosity. The controllability of the method is good and the production efficiency is high, which is favorable for industrialization.

The invention provides a processing method for a TC4 titanium alloy spiral groove screw tap. The method comprises the working procedures of blanking, rough turning, finish turning, milling, benching, heat treatment, grit blasting, surface treatment, external grinding working procedure, thread grinding, cutter grinding, relief grinding, laser carving, and the like. In the thread grinding working procedure, a tail of a spiral groove is used as a grinding benchmark, threads are at least fed for three times to grinding and processing, the threads are relief grinded to meet the requirement, and annealing is strictly prevented; in the relief grinding working procedure, different relief grinding manners are adopted according to the actual demands of the production, one manner is that a 0.5-1mm of allowance is kept during relief grinding of a dorsal horn, and another manner is that only the about 0.1mm of allowance is kept during relief grinding of the dorsal horn. Through the adoption of the method disclosed by the invention, the accuracy requirement of the spiral groove screw tap based on the TC4 titanium alloy materials can be effectively ensured, the production efficiency is greatly improved, and even more, the processing problem that a spiral tooth back is a curve tooth surface is perfectly solved.