56results about How to "Good forming precision" patented technology

The invention belongs to the field of laser processing, and relates to a near-net forming method and device for composite manufacturing a fine workpiece based on laser additive manufacturing and subtractive manufacturing. According to the method, the construction parameters of a three-dimensional digital-to-layer slicing layer are generated by utilizing software, laser additive manufacturing processing is carried out, and ultrafast pulse laser subtractive manufacturing processing is carried out alternately in the laser additive manufacturing processing process to form a three-dimensional entity. The device comprises a computer control device, a sealing molding chamber, a light path selecting system and an inert protection gas source; during additive manufacturing processing, the computer control device controls the light path selecting system to select the laser emitted by an additive manufacturing laser device and perform laser additive manufacturing processing; and during subtractivemanufacturing processing, the computer control device controls the light path selecting system to select ultrafast pulse lasers emitted by a subtractive manufacturing laser device and perform the ultrafast pulse laser subtractive manufacturing processing. According to the near-net forming method and device, the preparation of complex and fine-structure parts can be completed in a high-precision and integrated manner, the defects that traditional laser additive manufacturing is low in the forming precision, high in roughness and cannot be used for preparing a fine and complex inner cavity areovercome.

The invention belongs to the technical field of added material manufacturing, and in particular, discloses an added material manufacturing method for synchronous heat treatment. The method comprises the following steps: (S1) powder is paved, and is scanned by laser according to a preset scanning path to finish laser scanning of a present layer; (S2) after spacing by a period of time, the machinedpresent layer is reheated by low-power laser; and (S3) the steps (S1) and (S2) are repeated to finish laser scanning of all layers to obtain needed compact parts. The method reduces the material cooling speed during forming, prolongs the existence time of a molten pool, reduces the formation of cracks and holes, and can be applied to laser added material manufacturing of metal and metal-ceramic composite materials.

The invention discloses a preparation method for forming a ceramic dental crown/bridge through digital plane projection. The preparation method comprises the following steps: obtaining three-dimensional data of a dental crown or a dental bridge, scaling up and then discretely stratifying the three-dimensional data, projecting a digital ultraviolet source in ceramic slurry in a dental crown or dental bridge discretely stratified two-dimensional plane form and enabling the ceramic slurry to come into contact with photosensitive materials of ultraviolet under the action of ultraviolet plane projecting beams to be solidified, so that the liquid ceramic mixed slurry in the region is solidified; enabling the ceramic slurry outside the ultraviolet plane projection region to continuously exist in the form of liquid and automatically aligning and connecting the solidifying region on the current stratum with the solidifying region on the next stratum until all the stratified data are completed; after all the three-dimensional discrete surface data are projected, taking out a forming substrate together with a solidified sample on the forming substrate and finally obtaining the ceramic dental crown or dental bridge through the processes of high temperature sintering, and the like. The preparation method has the advantage and effect that the defect that free forming is difficult to achieve as the structure complexity is high when ceramic dental crowns or dental bridges are prepared by traditional cutting processes is avoided.

Disclosed is a flexible tube (10), comprising a flexible tube material (14) and a double-layered outer skin layer (15) which consists of an inner layer (17) coating the entire peripheral face of the flexible tube material (14) and an outer layer (18) coating the entire peripheral face of the inner layer (17). The outer skin layer (15) is obtained by supplying two kind of resins, which are overlaid in a molten state, into a single mold at the same time to form the double-layer laminate consisting of the inner layer (17) and the outer layer (18). As the resins forming the inner layer (17) and the outer layer (18), a combination of a soft resin and a hard resin, wherein the difference in 100% modulus value that indicates the hardness after molding is 10 MPa or more and the difference in melt viscosity at a molding temperature of 150-200oC that indicates the fluidity in the molten state is 2500 PaS or less, should be selected.

The invention provides a spinning tool for a barrel with an inner circumferential rib and a forming method. Spinning is carried out on a lathe. The tool comprises an outer spinning tool and an inner spinning tool. The outer spinning tool comprises a core mold, an outer spinning rotary wheel and a centre; the inner spinning tool comprises a transferring disc, a balancing rotary wheel, a core mold,an inner spinning rotary wheel, a rotary wheel rod and a rotary wheel substrate. The aluminum alloy barrel with the inner circumferential rib is formed with high precision effectively by controlling the factors such as the assembly precision of the tool, the dimensional precision of a spinning blank and the spinning process parameters. The forming method provided by the invention is high in practicality. By adopting the process method and the tool, the spinning process is stable and reliable, the part is good in forming precision, and a feasible forming method is provided for forming barrel parts with inner circumferential ribs.

The invention discloses a warm electromagnetic forming device of a skin piece. The warm electromagnetic forming device comprises a base plate, a die, a plate material and clamping plate assemblies used for fixedly clamping the plate material, the clamping plate assemblies are arranged on the base plate, the plate material is fixedly clamped between the clamping plate assemblies, the warm electromagnetic forming device further comprises a discharge coil and heating pieces used for heating the plate material, the discharge coil is arranged above the plate material, and the heating pieces are arranged on the two sides of the plate material. The invention further discloses a warm electromagnetic forming method which comprises the steps of plate material fixing, plate material stretch forming,plate material heating, electromagnetic forming and the like; and complete attachment of the plate material and a forming face of a mold is achieved by repeatedly executing plate material stretch forming, heating and electromagnetic forming. The warm electromagnetic forming device has the advantages that the forming accuracy is high, the forming quality is good, the forming efficiency is high, andthe requirement of the equipment for the discharge energy and the coil strengthen is low.

The invention provides a method forming a high-melting-point high temperature alloy part via multi-laser head multi-laser beam path scanning .First, metal powder is scanned by a first laser beam with power less than 200 W and short wavelength less than 1100 or long wavelength more than 10000nm in advance along a scanning path; the laser power is controlled, so pre-heat temperature is lower than a melting point of the metal powder; then a second laser beam with power no less than 200W and wavelength smaller than 1100nm to keep up with a moving direction of the first laser beam to repeatedly scan at the same linear moving speed; clockwise circular scanning surrounding the track center is conducted; a semi-annular high temperature field A is provided for the metal powder; a third laser beam keeps up with the moving direction of the first laser beam to repeatedly scan at the same linear moving speed; anticlockwise circular scanning surrounding the track center is conducted; a semi-annular high temperature field B is provided for the metal powder; a fourth laser beam keeps up with the scanning paths of the third and second laser beams to repeatedly scan at the same linear speed; an intersected area between the annular temperature field A and annular temperature field B is heated; and heat processing is conducted.

The invention relates to a ball valve flange combined rolled ring forming method. The ball valve flange combined rolled ring forming method is characterized by including the following steps of (1) determining shape and size of a ring blank, (2) determining structure and size of a rolled hole and (3) determining rolled forming parameters, wherein the step (1) includes that the shape of the ring blank is determined according to geometrical characteristics of a section of a forge piece, the volume and the equivalent rolling ratio of the ring blank are determined according to geometric dimensioning of the forge piece, and the size of the ring blank is determined; the step (2) includes that working surface structures and sizes of a main roller, a core roller and an auxiliary roller are determined by combination of combined rolled ring deformation conditions, device structures and sizes of the ring blank and the forge piece; the step (3) includes that rolling line speed, rolling feeding speed and rolling time are sequentially determined by combination of sizes of the rollers, the ring blank and the forge piece and combination of combined rolled ring stable conditions and rolling process stability requirements. According to the ball valve flange combined rolled ring forming method, the rolling process is reasonably designed and controlled, a ball valve flange combined rolled ring can be accurately formed, energy materials consumption can be effectively reduced, the production efficiency is increased, and production costs are lowered.

The invention discloses a preheating and insulation device for laser selective melting forming. Compared with existing laser selective melting equipment, the working environment of the preheating andinsulation device is the vacuum environment with the pressure being 10-1 Pa or above, convection in the vacuum environment is weak, heat is not liable to be dissipated, the preheating and insulation effects can be greatly improved, due to the good heat insulation performance, equipment sensitive elements are not damaged due to obvious temperature increase even though the preheating temperature ishigh, and the preheating temperature of the laser selective melting equipment can be greatly increased; a single laser is used as a light source, conversion of preheating scanning and forming scanningis achieved through moving of a focus lens, and the better economical efficiency is achieved compared with the mode that two lasers are used (one of the two lasers is used for preheating scanning, and the other laser is used for forming scanning); and compared with electron beam selective melting equipment, the laser selective melting equipment is especially suitable for forming magnetic or non-conducting materials, finer powder can be used, the part forming precision is higher, and the market prospects are broad.

The invention relates to a voice diaphragm pressure bearing piece stamping and laser irradiation composite forming machining device and a method of the device. The device is a composite device formed by combining an automatic grading stamping forming die and a laser irradiation heating system. Strip-shaped materials are fed and located under the control of an automatic feeding device. The voice diaphragm pressure bearing piece forming machining process is divided into three continuous automatic grading steps of punching, laser irradiation heating forming and blanking. In a first station, an edge pressing mechanism, a punching male die and a fixed die plate are combined for punching, so that a voice diaphragm pressure bearing piece is punched; in a second station, a forming male die, the fixed die plate and restraint layer glass are combined to acquire a laser irradiation heating forming station, a laser unit works, the strip-shaped materials are irradiated with lasers through the restraint layer glass, the strip-shaped materials are heated and softened through laser irradiation, extrusion of the forming male die is conducted, and therefore the voice diaphragm pressure bearing piece is formed; in a third station, blanking is conducted, the voice diaphragm pressure bearing piece is blanked through a blanking male die. The voice diaphragm pressure bearing piece stamping and laser irradiation composite forming machining device is simple, practical and low in cost, the forming efficiency of the voice diaphragm pressure bearing piece is high, and the forming accuracy of the voice diaphragm pressure bearing piece is good.

A die cavity pressure sensor is set in the forming die of ejection forming machine, a rubber-jetting screw rod position sensor is mounted on the rubber-jetting screw rod, in the power of starting ejection to switching to retain pressure the substitution mode control method is always in starting state, in which, after the signal P1 of die cavity pressure sensor and S1 rubber-jetting screw rod position sensor are picked up, a grey-level predictive mathematical model is used to respectively estimate next point P2 and S2 by using two points of every signal, and they are their actual measured values are subtrated to obtain precitive residual quantities P3 and S3, then the time sequence curves formed by using P3 and S3 can be used to find out the die cavity pressure predictive residual quantitypeak value P4 and screw rod position predictive residual quantity peak value S4.

The invention discloses a near-net forming method for a split type axle box body for a standard motor train unit, and solves the problem that an upper box body of the split type axle box body for a standard motor train unit bogie cannot be forged by adopting an opening type forging process. The near-net forming method for the split type axle box body for the standard motor train unit comprises thesteps of (1) blanking: blanking according to the calculated length; (2) heating: heating a cylindrical workblank to 480+/-10 DEG C, and preserving heat for 4 to 6 hours; (3) rolling forging for forming a blank: enabling the cross sectional area of each feature section of the blank to be approximately close to the corresponding cross sectional area of the axle box body; (4) multi-directionally dieforging and pre-shaping: shaping a rib plate part of a center rod part; (5) multi-directionally die forging and finally shaping: shaping an inner contour, an outer contour and a projecting part on the outer contour; (6) punching the wad: punching the wad of a large hole and a small hole; (7) dividing: dividing an integrated forge piece of the upper box body, a lower box body and a gland into three independent forge pieces; and (8) shaping the lower box body, wherein the height of the lower box is reduced, and the dimension of the outer contour is increased to meet the requirement of the dimension of the forge piece of the lower box body.

The present invention provides a cylindrical container for a body fluid treatment and a body fluid treatment. Even if the cylindrical container for a body fluid treatment is injection-molded with a plastic material with low impact resistance strength, the strength near the weld line can be reduced less, It is a cylindrical container for body fluid treatment with high impact resistance that is not easily broken even if it is knocked with tweezers during prefilling operation. The cylindrical container for the body fluid treatment is formed by injection molding a plastic material with an impact strength of 10 kg·cm/cm or less using a mold provided with a gas discharge portion in the mold portion abutting against the weld line of the molded product.

The invention discloses a manufacturing method for a high-strength and high-precision small taper angle part and belongs to the technical field of precise plastic processing. The manufacturing method comprises the following steps that (1) a machining method is adopted to obtain blanks; (2), a cold spinning process method is adopted to finish forming of the high-strength and high-precision small taper angle part; and (3), according to the requirement of a drawing, follow-up machining is finished, and a product is obtained. The prepared product is high in strength, good in forming precision, and good in product uniformity, the structure and mechanical performance of the part after forming can be improved, and the quality of the product is greatly improved. The preparation method for the blanks is simple and easy. The cold spinning process is adopted to obtain the small taper angle part through once-forming. Operation is easy, the production procedure is simplified greatly, spinning machining is fast in beat, and the production efficiency is high. The cold machining mode is used to obtain the small taper angle part, so that the defects that the utilization rate of materials machined by a traditional ring forging machine is not high and gas in the process of winded welding is harmful and risky to human bodies are overcome, and meanwhile, enormous energy is saved.

The invention discloses a high-energy beam peak moving processing path planning method and belongs to the technical field of high-energy beam manufacturing. According to the high-energy beam peak moving processing path planning method, when filling scanning paths of various to-be-processed layers are generated, between the adjacent various layers, positions, highest in power, in the high-energy beam scanning paths mutually deviate by set amounts, and therefore energy distribution in the processing process is improved, and then the processing quality and precision in the additive manufacturingor subtractive manufacturing process are improved; the method includes the following steps that firstly, a processing model is subjected to layering; secondly, peak moving processing path planning parameters are set; thirdly, a processing path of a first layer in the peak moving period is generated; fourthly, processing paths of subsequent various layers in the peak moving period are generated; and fifthly, the step (3) and the step (4) are repeated till the processing paths of all the layers are generated. According to the method, by adjusting the center position deviation of the high-energybeam scanning paths of the adjacent processing layers, that is, a pointed peak is moved away, peak moving for short, energy density homogenization of processing of the plurality of layers is achieved,and the processing quality and precision are improved.

The invention relates to a crease-resistant device for stamping forming of a large curved-surface thin-wall component. The crease-resistant device comprises a female die and a male die, and an elastic device enabling the female die to be in full contact with a plate all the time when the plate is formed is arranged between the female die and the male die. The crease-resistant device mainly overcomes the defect of wrinkling in a free surface area of a gap between a male die and a female die when spherical components such as satellite reflecting surfaces and rocket tank bottoms are stamped, and the core principle of the device is that the free surface area of the area is reduced, so that when the male die moves downwards, the female die can deform along with the shape and always keep full contact with a plate, sufficient constraint is provided, and the uniform flowability of the plate is improved, so that the defects of wrinkling and the like of the component are inhibited.