34results about How to "Guaranteed wall thickness uniformity" patented technology

The invention relates to a processing method of a large-scale thin-wall cabin shell body. The processing method comprises the steps of 1, reserving a criterion boss on the shape of the shell body when casting the shell body, conducting rough machining on the lineation criterion, leveling a front and back end surfaces of the shell body, and conducting rough machining on the front and back end surfaces of the shell body; 2, conducting rough machining on shape and an inner cavity of the shell body according to the processing criterion in the step 1, conducting aging treatment after the rough machining, and detecting form and location tolerance deformation quantities of the shell body before and after the aging treatment; 3, analyzing remaining quantities of various parts of specially shaped end of the shell body according to a deformation rule of the shell body, judging whether there is a need to borrow quantity, finishing semi-finishing on the shape and the inner cavity of the shell body, and conducting aging treatment after the semi-finishing; 4, detecting the form and location tolerance deformation quantities before and after the aging treatment of the shell body in the step 4, further figuring out the deformation rule of the shell body, and finishing finish machining of the shell body; 5, finally detecting all the sizes of the shell body and storing the shell body into a storage after the shell body is qualified. The invention also relates to a clamp used according to the method. The processing method can improve sharply processing efficiency, guarantee the quality of a product, causes a small processing deformation, and can guarantee the homogeneity of shell wall thickness.

The invention provides a molding die and a molding method for composite material pipe fittings. The molding die includes a metal outer mold, a core mold and a connection structure arranged at both ends of the metal outer mold; a through hole is arranged in the middle of the metal outer mold, and the core The mold is arranged in the through hole; the metal outer mold is composed of an upper metal outer mold and a lower metal outer mold; the core mold includes a core material layer and a nylon bag film layer sleeved on the outer surface of the core material layer. Composite material pipe fittings prepared by the molding method of the present invention have lower production cost, higher internal quality, and better product thickness uniformity compared with traditional molding techniques, and can shape pipe fittings of various shapes according to product design drawings.

The embodiment of the invention discloses a precision casting forming technology for a high-strength aluminum alloy of a large thin-walled wing body fusion special-shaped cabin shell. The technology comprises the following steps of casting a ZL205A high-strength aluminum alloy large thin-walled mesh rib wing body fusion cabin shell through an integral precision sand casting molding process; performing heat treatment on a large thin-walled aluminum alloy special-shaped cabin shell and controlling a deformation amount by adjusting parameters in a heat treatment process to form a high-performancecasting after the heat treatment; and performing numerical control machining on the casting which is subjected to the heat treatment, and controlling the deformation amount through integral surrounding layered cutting cycle machining, three-dimensional photographing scanning, datum transforming and the like in a numerical control machining process, so that precision machining deformation controlof a large thin-walled weakly rigid special-shaped complex cabin product is completed. Through the technology, series of key technical problems that the conventional aluminum alloy casting forming process cannot realize ZL205A high-strength aluminum alloy precision casting and the heat treatment of a large thin-walled weakly rigid mesh rib special-shaped cabin body, and the machining deformation is difficult to control are solved.

The invention belongs to the technical field of machining and manufacturing, and discloses a manufacturing method for an ultra-long thin-wall aluminum alloy sandwich grid rib double-skin integral tailfin. The manufacturing method includes the steps that a ZL205AA high-strength aluminum alloy is used for pouring and molding the integral tail fin; heat treatment is carried out on the integral tailfin; and numerical control machining is carried out on the integral tail fin after heat treatment. According to the manufacturing method for the ultra-long thin-wall aluminum alloy sandwich grid rib double-skin integral tail fin, the overall quality of precision molding, machining and manufacturing can be improved, and the manufacturing cycle is shortened while the manufacturing cost is lowered.

The invention belongs to the precise investment casting technology and relates to a method for controlling aero-engine hollow guide blade upper edge plate cavity wall thickness. The method is characterized in that the hollow guide blade upper edge plate wax pattern cavity wall thickness is changed to control casting cavity wall thickness, the front edge of the core body (3) of a ceramic core (7) is allowed to tilt towards a non-runner face, and the included angle alpha of the lower surface (11) of the core body (3) and the runner face (10) of a hollow guide blade upper edge plate wax pattern is allowed to range from 0 degree 30 minutes to 1 degree. By the method, hollow guide blade upper edge plate casting wall thickness evenness at hollow parts is guaranteed, design drawing requirements are satisfied, oversize and scrap are avoided, production yield is increased, and production cost is lowered.

The invention discloses a preparation method of a cup-shaped flexible wheel and a device thereof. A circular slab is tightened at the end of a core die by a tail top. A positive wire of a pulse powersupply is connected with the core die, and a negative wire is directly connected with each rotary wheel of a rotary wheel assembly. The circular slab is first spun and deformed into a cup-shaped workpiece with both inner and outer walls being straight walls by one rotary wheel. Then the cup-shaped workpiece is spun and deformed into two thickened cup-shaped workpieces with different straight wallthickness by another two rotary wheels, and a thicker smooth section is used as a tooth profile reserved section. Finally, the tooth profile reserved section is spun by one toothed rotary wheel to form a circle tooth profile around the outer circumference. At last, a small amount of cutting process is carried out to complete the processing process from the circular slab to the cup-shaped flexiblewheel workpiece. According to the cup - shaped flexible wheel manufacturing process based on plastic forming, streamline formed in the process of deformation can be completely retained, and the service life of parts is prolonged advantageously. The advantage of the method is more obvious for flexible wheels with an extremely small thickness.

The invention relates to a hot reverse extrusion forming method for a titanium alloy cup-shaped part, and belongs to the technical field of hot reverse extrusion forming technologies. The machining method comprises the steps of placing a heated blank into an extrusion container to be subjected to reverse extrusion one-time forming by utilizing the guide positioning action of a material pressing insert, and the roughing blank making step in the forming process of the cup-shaped part is omitted. The material pressing insert guarantees that lugs of the cup-shaped part are flush through the tension action of a back pressure spring; and meanwhile, because a floating male die is in linkage with the back pressure spring with higher back pressure tension, it is achieved that the cup-shaped part can be demolded smoothly after being formed. With the hot reverse extrusion forming method for the titanium alloy cup-shaped part, the phenomenon that in the traditional reverse extrusion process, because one single unloading spring is overhigh in back pressure, the material of a wall of a cup-shaped part flows inwards sharply to tightly hold a male die, and demolding is difficult to carry out is avoided, and meanwhile the reverse extrusion forming force is reduced, and the requirement on equipment tonnage is lowered; and additionally, because a titanium alloy cup-shaped force piece is formed atone time by adopting reverse extrusion in the preparation process, the step of roughing blank prefabrication in the existing technology is omitted, the production period is shortened, the manufacturing cost is reduced, and the economic benefit is greatly improved.

The invention relates to the technical field of spinning pressing forming, in particular to a spinning pressing forming method of a deep conical thin-walled rotary part with a flange. The method comprises the following steps of determining the number of times of spinning pressing, and working out the sizes of a circular flat plate blank according to the volume, turning allowance and spinning pressing forming allowance of the blank which is already subjected to the last time of spinning pressing forming and the equal volume principle; determining the process parameters of a spinning wheel and multi-section core dies during each time of spinning pressing according to the wall thickness and half taper angle of the blank during each time of spinning pressing forming, wherein the rotating speeds of the core dies are sequentially reduced from the small-diameter end of the core dies to the large-diameter end of the core dies; carrying out spinning pressing on the corresponding core dies withthe number of times of spinning pressing starting from 1 to n to gradually reduce the wall thickness or half taper angle of the blank until the blank formed after the last time of spinning pressing forming is obtained; and carrying out turning on the blank which is formed after the last time of spinning pressing forming. The spinning pressing forming method of the deep conical thin-walled rotary part with the flange is suitable for alloy materials, and the sectional and different rotating speeds of the core die are designed to ensure the wall thickness forming uniformity of the part.

The invention provides a machining method of an elongated thin-wall aluminum-based composite material pipe with uniform wall thickness. The machining method comprises the following steps that firstly,rough turning is carried out on an outer circle of the aluminum-based composite material pipe; secondly, destressing heat treatment is carried out, then an inner hole is roughly bored by using a special tool, then destressing heat treatment is carried out again, then destressing heat treatment is carried out after the outer circle of the aluminum-based composite material pipe is subjected to semi-finish turning, then a special tool is used for finely boring the inner hole, and finally finish turning is carried out on the outer circle. According to the machining method of the elongated thin-wall aluminum-based composite material pipe with the uniform wall thickness, the large length-diameter ratio thin-wall pipe can be produced, and the wall thickness uniformity, straightness and coaxiality can be guaranteed.

The invention discloses a wall thickness homogenization method adopting isothermal stamping for a titanium alloy thick-wall spherical shell. Through divisional design on friction coefficients of a male die and a to-be-formed plate, the male die and pull rings are heated separately so that a temperature gradient is formed, the wall thickness homogenization of the titanium alloy thick-wall sphericalshell is ensured, the spherical bottom reduction rate is reduced from 50% in conventional forming to below 15%, the overall wall thickness fluctuation of a housing does not exceeds 30% of the wall thickness of a blank and the size is stable. Since the reduction of the spherical bottom is inhibited effectively, the extent of damage of the mechanical property at the spherical bottom is reduced substantially, the overall mechanical property of the titanium alloy thick-wall spherical shell is better, the titanium alloy thick-wall spherical shell is particularly applicable to development and production of a TA7 low-temperature titanium alloy gas cylinder product for a carrier rocket, and is also applicable to the development and production of titanium alloys in other fields and other trademarks and the like products, and the wall thickness homogenization method is very practical.

The invention discloses a thin-wall shell forming die device with a rigid insertion type solid core male die. The thin-wall shell forming die device comprises a female die which is divided into at least two oppositely-arranged parts, and the male die is arranged in the female die; a cavity for forming a shell is formed between the outer wall of the male die and the inner wall of the female die; the male mold is of a solid-core silica gel structure; a core shaft hole which is used for being inserted into by a core shaft and is matched with the core shaft in shape is formed in the male mold; anda core shaft hole port is located at the tail end of the male mold. The thin-wall shell forming die device with the rigid insertion type solid core male die can eliminate glue accumulation, ensure uniform wall thickness of the formed shell, and is more convenient and fast to operate.

The invention discloses a winding drum device and a conical drum preparation method. The winding drum device comprises a base, a support, a swing table, a mandrel and a floppy disc, the support and the swing table are arranged on the base, the floppy disc is arranged on the swing table, the floppy disc is used for bearing a foil material, the mandrel is rotatably arranged on the support, and the swing table is arranged on the support, the tail end of the mandrel can abut against the floppy disc to enable the floppy disc and the foil to deform, the swing table can drive the floppy disc to swing so as to adjust the angle, and the mandrel rotates to drive the foil and the floppy disc to rotate so as to roll the foil.