34results about How to "Increase the brazing area" patented technology

A heat exchanger has a tank communicated with tubes at longitudinal-direction ends of the tubes. A first plate member of the tank has a core plate portion connected with the tubes and two side wall portions facing each other, which are constructed of a metal plate material. The second plate member of the tank has an opposite wall portion facing the core plate portion and two cap portions facing each other, which are constructed of a metal plate material. The core plate portion has a protrusion-shaped cross section in the longitudinal direction of the tubes. The first plate member and the second plate member are integrated by brazing. An inner surface of one of the plate members contacts an end surface of other of the plate members, and a fillet is formed between an extension portion of the one plate member and a shear droop of the other plate member.

A stacking-type, multi-flow, heat exchanger includes a plurality of heat transfer tubes and fins stacked alternately, a tank formed at an end of the heat transfer tubes, and an end plate provided at an end of the tank. The heat exchanger has a projecting portion provided to a surface of an outermost tube plate, a raised portion with an opening formed through the projecting portion, and an engaging portion and a closing portion provided integrally to the end plate for engaging the raised portion and for closing an opening of the raised portion. A positional shift of the end plate at the time of temporary assembling may be prevented, and the brazing properties and the pressure resistance of the tank end portion may be increased.

A flat tube making platelike body 15 is in the form of a single metal plate in its entirety and comprises two flat wall forming portions 17, 18 having the same width, a connecting portion 16 for interconnecting these portions 17, 18, side wall forming portions 9, 10 projecting from the respective flat wall forming portions 17, 18 and each formed integrally with one side edge of the flat wall forming portion opposite to the connecting portion 16, and first and second reinforcing wall forming portions 11, 12 integrally formed on each of the flat wall forming portions 9, 10. The first reinforcing wall forming portions 11 are butted against the respective second reinforcing wall forming portions 12 in pairs when the metal plate is folded into a hairpin form at the connecting portion 16. The first reinforcing wall forming portions 11 are given a smaller thickness than the second reinforcing wall forming portions 12 on the other flat wall forming portion 18 butted against the respective portions 11. The platelike body 15 gives an enhanced brazing joint strength to the reinforcing wall forming portions in fabricating a flat tube, and improved pressure resistance to the flat tube to be fabricated.

A heating device includes a high-frequency electrode embedded substantially in parallel with a heating surface of a ceramics base in the vicinity of the heating surface. A conducting hole toward this high-frequency electrode is formed in a back face of the ceramics base. This high-frequency electrode has a trapezoidal cone-like concave section toward the conducting hole at a region opposed to the conducting hole.

The invention relates to the technical field of workpiece machining, and discloses a machining method of a thin-wall complex cavity. The method comprises the following steps that S1, a workpiece is split into multiple layers according to an internal flow channel structure, and each layer becomes an independent cavity; S2, each cavity is split into a base plate and a cover plate, a runner groove isformed in each base plate, the cover plates matched with the runner grooves are machined, and chamfers are machined at the corners of the tops of the cover plates; S3, the cover plate and the base plate of each cavity are cleaned and polished and assembled, and brazing filler metal is injected into brazing seams along the chamfers of the cover plates; S4, each cavity is put into a vacuum furnacefor vacuum brazing; S5, the surface of each cavity is subjected to finish machining; S6, the cavities are cleaned and polished and assembled into a workpiece, and brazing filler metal is injected intoweld joints; S7, the workpiece is put into the vacuum furnace for vacuum brazing; and S8, finish machining is conducted on the workpiece after brazing. A thin-wall complex cavity workpiece is machined through the vacuum brazing method, simultaneous welding of a plurality of independent complex cavities and overall welding of the workpiece are achieved, and the requirements for the size and precision of the workpiece are met.

The invention discloses a manufacturing method of a wind tunnel heater with a special-shaped air pipe. The manufacturing method comprises the following operation steps: a liquid nozzle, the special-shaped air pipe, an air pipe and a shell are machined; the liquid nozzle, the special-shaped air pipe and the air pipe are sequentially assembled at the assembling positions of the shell; a first partition plate is machined, and a flow collecting groove used for conducting flow dividing on brazing filler metal is formed in the first partition plate; the first partition plate penetrates through the liquid nozzle, the special-shaped air pipe and the air pipe and is assembled on the shell to obtain an assembly component; the assembly component is placed in a vacuum brazing furnace to be subjected to vacuum brazing to obtain a primarily brazed component; a second partition plate is machined, the second partition plate is assembled on the first partition plate and the shell, and then a special-shaped air pipe reinforcing ring, an air pipe reinforcing ring and a liquid nozzle reinforcing ring are assembled on the second partition plate; after assembling is completed, a cover plate groove is machined, a cover plate is assembled into the cover plate groove to obtain a heater component; and the heater component is subjected to vacuum brazing. By adjusting the brazing structure, the welding difficulty is reduced, and the product quality is guaranteed.

The invention discloses a titanium metal thermos cup and a manufacturing method thereof. The manufacturing method comprises the following steps: before vacuum brazing and sealing, adopting a vacuum high-temperature hot working mode to clean the whole titanium cup body of the back cover or double titanium metal; after cooling, performing vacuum brazing sealing again. The main production steps include: semi-finished cup body and back cover production, complete cup body or bottom seal cleaning treatment, brazing sealing, and surface treatment. The manufacturing method of the invention solves theproblem of low qualified rate of brazing seal, complex brazing structure, high technical difficulty of manufacturing process, poor reliability and the like of the prior technical scheme, and obtains the same or better sealing performance, reliability and heat preservation effect as stainless steel thermal cup, and the brazing sealing structure is simple.

The invention relates to the field of spacecraft machining, and discloses a machining method of an injector partition plate cavity. The machining method of the injector partition plate cavity comprises the following steps that A1, a fan-shaped groove and a wedge-shaped vertical groove are cutted on the inner circumference of an annular body; an upper cover plate, a lower cover plate and a wedge-shaped insert are machined, the upper cover plate and the lower cover plate is assembled at the fan-shaped groove, finish machining is carried out on the wedge-shaped insert, the wedge-shaped insert is assembled at a vertical groove, and vacuum brazing is carried out to obtain a partition plate cavity body assembly: A2, a ring groove piece is assembled at the inner circumference of the partition plate cavity body assembly, and fixing and brazing are achieved; wire cutting, assembling and brazing are performed on a hollow plate and a corrugated plate to obtain a partition plate; an adapter is wire cutted and assembled with the partition plate to obtain a honeycomb assembly: A3, the upper end of the wedge-shaped insert and the upper end of the annular groove piece are milled to form a sinking table surface, and a compensation block is finish-milled; a square groove is milled in the middle of a reinforcing plate, and brazing filler metal grooves are milled in the two sides of the square groove and the outer end face of the reinforcing plate; the partition plate cavity body assembly, the reinforcing plate, the honeycomb assembly and the compensation block are assembled, fixed and brazed; and finish machining is carried out after discharging, and argon arc welding is carried out on a water connector at a water inlet hole to obtain an injector partition plate cavity.

The invention discloses a brazing method for improving the connecting strength of PDC and a steel matrix. The brazing method comprises the following steps that the drill bit steel matrix and a PDC hard alloy section are pretreated; the pre-treated PDC hard alloy section is subjected to laser etching treatment, then cobalt plating and nickel plating are carried out on the PDC hard alloy section insequence, so that the PDC hard alloy sections form a cobalt-nickel composite coating; a tooth hole is machined in the drill bit steel matrix, and the circumferential surface of the tooth hole is subjected to wire drawing treatment and then washed with acetone; the circumferential surface of the PDC hard alloy section coated with the cobalt-nickel composite coating and the circumferential surface of the tooth hole after wire drawing treatment are coated with elemental boron and nickel-cerium alloy mixed powder; after a brazing filler is placed on the bottom of the tooth hole coated with the elemental boron and the nickel-cerium alloy mixed powder, the PDC hard alloy section is placed into the tooth hole, and then a brazing filler is placed between the PDC and the circumferential surface ofthe tooth hole to obtain a brazing assembly; and the brazing assembly is placed in a resistance furnace for heating, the temperature is cooled to room temperature along with the furnace, then the assembly is taken out, and the high-strength connection of the PDC and the steel matrix is completed. According to the brazing method, the strength of the braze welding head and the service life of the PDC drill bit are prolonged.

The present invention relates to hard alloy brazing plate and bore bit. The brazing plate has a brazing plate body and locating fins in the same height on two sides of the body to ensure the brazing plate body fixed in the center of the slot for homogeneous brazing seam, high brazing seam strength, the homogeneous elimination of the high temperature stress of the hard alloy brazing plate during the brazing, stable performance, homogeneous strength and no cracking. Or, the brazing plate has symmetrical inward notches on two sides to raise the raise the radial shock resistance and wear resistance of the brazing plate and ensure the homogeneous radial wear. The bore bit with the hard alloy brazing plate embedded in the fixing slot has high product quality, and long service life of driving length up to 800-900.

The invention relates to a brazing method for a tungsten carbide die punching head and a steel base. According to the brazing method, the big square block brazing face of the steel base is machined and divided into 3*3mm<2> small blocks at intervals, the width of a groove between every two small blocks is preferably 3mm, and the depth of the groove is preferably 2mm; when the tungsten carbide die punching head is brazed on the steel base, the heating temperature of a whole workpiece is smaller than 650 DEG C; high-frequency heated areas are controlled, and after brazing is finished, the workpiece is cooled slowly so that internal stress of the brazing face can be reduced. The brazing method has the advantages that in the process of brazing, the size of the small blocks is very small, and therefore the strain difference of steel and tungsten carbide in the areas is very small; the process of brazing cooling is very balanced, cooling is performed from the edge of each small block to the inside, and due to the small area of each small block, synchronous cooling is basically achieved. Therefore, the stress of the whole brazing face can not be superposed, and the internal stress of brazing is reduced below 10% of the internal stress of the big square block brazing face. In the follow-up machining process, the workpiece can not be cracked and scrapped.

The invention discloses an overall welding method of a complex rectangular spraying pipe. The overall welding method comprises the following steps that according to the design requirement of the complex rectangular spraying pipe to be machined, four components of the spraying pipe are manufactured respectively and then subjected to vacuum brazing; the four components comprise a left side assembly,a right side assembly, an upper portion assembly and a lower portion assembly, wherein the left side assembly and the right side assembly are symmetrical, and the upper portion assembly and the lowerportion assembly are symmetrical; foil-like brazing filler metal is overspread on a first stainless steel base plate, one face, provided with a cooling channel, of a first copper plate faces the foil-like brazing filler metal, and after a tool carries out pressing, vacuum brazing is carried out to obtain the left side assembly and the right side assembly; a cambered surface of a second stainlesssteel base plate is a combination face, the foil-like brazing filler metal is overspread on the cambered surface, then the attachment cambered surface of the second copper plate faces the foil-like brazing filler metal, and after the tool carries out pressing, vacuum brazing is carried out to obtain the upper portion assembly and the lower portion assembly; and all the components are assembled into a rectangular structure, paste-like brazing filler metal is laid on connecting seams, and after pressing, vacuum brazing is carried out to obtain the rectangular spraying pipe overall assembly. According to the method, the parts are machined and subjected to brazing firstly, then overall brazing is carried out, and therefore the machining difficulty is reduced.

The invention discloses a novel intercooler main blade. The novel intercooler main blade comprises an intercooler body, a cooling pipeline, a first intercooler main blade body, an air pipeline, a second intercooler main blade body and an intercooler pipeline. The cooling pipeline is inlaid in the intercooler body. The first intercooler main blade body and the second intercooler main blade body are connected to the two sides of the intercooler body correspondingly. The air pipeline is arranged in the intercooler body. The two ends of the air pipeline are connected with the first intercooler main blade body and the second intercooler main blade body correspondingly. The intercooler pipeline is arranged in the intercooler body. The novel intercooler main blade is of a U-shaped structure through inward flanging. The contact area between the intercooler main blade bodies and the intercooler pipeline is increased. Accordingly, the brazing area is increased, and the connecting strength between the intercooler main blade bodies and the intercooler pipeline is enhanced.

The present invention discloses a main board of an EGR (exhaust gas recirculation) cooler; a set or multiple sets of through holes matched with a cooling pipe are formed in the main board, wherein a turnup is arranged around the main board; and flanges perpendicular to a main board plane are arranged around the through holes and are less than the main board in thickness. Contact area between the main board and the cooling pipe is able to be increased by the flanges to increase braze welding area, so that the main board and the cooling pipe are firmly welded, a deformation failure caused due toexcessive concentration of local stress is avoided, and the EGR cooler is prolonged in service life. The flanges are directly arranged on the through holes of the main board instead of increasing parts, thus the manufacturing cost is not increased on the premise of solving welding fastness. The flanges are less than the main board in thickness, so that a water channel between adjacent flanges isable to be widened, thereby facilitating medium circulation.

The invention relates to an automobile all-aluminum intercooler which comprises a core and air chambers connected to the two ends of the core. The core comprises a main sheet and side boards connectedwith the main sheet. The main sheet comprises a main sheet body and a turned edge structure arranged on the periphery of the main sheet body, and the turned edge structure is in fixed and attached connection with assembly connecting faces of the air chambers. Compared with the prior art, the automobile all-aluminum intercooler has the advantages of being high in product quality, high in percent of pass, simple in assembly process, capable of saving manpower and material resources, beautiful in appearance, high in economic benefit and the like.

The invention discloses a manufacturing method of a coiled pipe heat exchanger core. The manufacturing method comprises the following steps that coiled pipes, an upper plate, a cover plate, an oil collecting plate and a plurality of partition plates are machined respectively, and lap joints are machined on the upper plate and the cover plate; an assembly tool with a guide cone is inserted into an opening in the upper end of each coiled pipe, a lower plate and the plurality of partition plates penetrate through the guide cones to be assembled on the coiled pipes under the guidance of the assembly tools, and the positions between the lower plate and the partition plates are positioned through positioning tools; the to-be-brazed positions of the coiled pipes and the upper plate are coated with brazing filler metal; the cover plate is assembled on the upper plate, the oil collecting plate and connectors are welded into an oil collecting plate assembly, and the oil collecting plate assembly is assembled on the coiled pipes through the assembly tools; the to-be-brazed positions of the coiled pipes and the oil collecting plate assembly are coated with brazing filler metal; and brazing tools are additionally arranged on the periphery of a heat exchanger core body assembly, and the heat exchanger core body is placed in a vacuum brazing furnace to be subjected to vacuum brazing. According to the manufacturing method, by designing the assembly tools, the positioning tools and the brazing tools, the manufacturing difficulty is overcome, and the machining difficulty is reduced.