90results about How to "Avoid forming defects" patented technology

The invention provides a three-dimensional curved surface stretch forming method based on a surface-changing discrete mould, and belongs to the field of metal plastic machining. Nonuniform deformation of a plate in the stretch forming process is the main cause of kinds of defects. According to the method, based on the discrete mould, the forming process of a curved surface is controlled through the change of the mould surface. In the forming process, the plate is kept completely attached to the mould surface all the time, the continuous and uniform change of the mould surface makes the deformation of the plate more and more uniform, the forming defects are avoided, and a high-quality curved-surface part can be obtained through stretch forming. The discrete mould is composed of regularly-arrayed basic body units, and real-time control over the geometrical shape of the surface of the stretch forming mould is achieved by changing the height of the basic body units. Besides, in the stretch forming process, the plate is clamped by a clamp to rotate along with the change of the mould surface, the clamp does not need to move in the horizontal direction or height direction, and therefore a loading structure of stretch forming equipment can be simplified through the forming method.

The invention belongs to the technical field of an optoelectronics technology of a semiconductor and relates to a method for prolonging the service life of a semiconductor laser device, namely an integrated technology of plasma technology, passivation technology, ion auxiliary technology and optical film technology. The method comprises a semiconductor laser device bar 1, a semiconductor laser device bar 2 processed by the plasma technology, a passivation film 3, a front cavity surface film 4 and a rear cavity surface film 5. The method comprises the following steps of: orderly stacking the sorted semiconductor laser device bar 1 on a special bar clamp; putting into a vacuum coating machine; and extracting vacuum. When a pre-set vacuum degree is realized, the plasma technology is firstly adopted to carry out cavity surface washing to wash cavity surface oxides and an unstable surface state to form the semiconductor laser device bar 2 processed by the plasma technology; then the passivation technology is adopted to deposit one layer of the passivation film 3 on the cavity surface to inhibit the cavity surface from being oxidized; and finally, the ion auxiliary technology and the optical film technology are adopted to prepare the front cavity surface film 4 and the rear cavity surface film 5, which have high-laser damage threshold values, so as to improve a cavity surface damage threshold value of the semiconductor laser device. With the adoption of the method disclosed by the invention, the service life of the semiconductor laser device can be effectively prolonged.

The invention relates to the technical field of PVC production filling materials and especially relates to a modification method of phosphogypsum for PVC material production. The method comprises mixing fresh phosphogypsum and quicklime until pH is in a range of 6-8 so that phosphogypsum free water content is reduced, carrying out heating treatment through a stirring heater, controlling the temperature in a range of 150-180 DEG C so that the fresh phosphogypsum is transformed into semi-hydrated phosphogypsum, adding paraffin into the semi-hydrated phosphogypsum so that phosphogypsum plasticity and rheological properties are improved and the dry phosphogypsum adsorbs water to form crystal water with an unstable structure, carrying out dry grinding and screening so that crystal water in the phosphogypsum is exposed, related content of phosphogypsum impurities in unit volume is reduced and phosphogypsum whiteness is improved, and carrying out stir-frying at a temperature of 180-200 DEG C so that a part of crystal water in phosphogypsum is lost. The prepared phosphogypsum is a mixture of semi-hydrated gypsum, III-type anhydrite and II-type anhydrite, has high rheological properties and plasticity and improves PVC quality.

The invention provides a forming technique of a hub with a bidirectional cylindrical boss. The forming technique forms and manufactures the hub with the bidirectional cylindrical boss by adopting an impact forging composite formation process, and comprises the steps as follows: firstly, a blank is stretched to form a conical part with a protruding edge via two times of stretch; secondly, two times of shrinkage edge turning and shaping of the punched conical part are performed, and a blank central cylinder wall is formed; lastly, the bidirectional cylindrical boss is formed step by step via four times of upsetting. Therefore, the formation defects of a hub with the bidirectional cylindrical boss, formed by adopting ways of monoblock cast, welding and processing with a forging machine, are overcome. The hub with the bidirectional cylindrical boss, formed via the forming technique is high in utilization ratio of material, formation efficiency and formation precision, and is better in overall mechanical property.

The invention provides a large-curvature three-dimensional hook face multi-step forming method based on a gradually-changed mold molded face, and belongs to the field of metal plastic working. Large-curvature three-dimensional hook face parts are difficult to form, and various forming defects, in particular to the corrugation defect, are extremely prone to occurrence in the forming process; and in a traditional drawing forming method, even though large-curvature hook faces can be machined, complex blank pressing molds are needed, and the method is suitable for thin-plate forming and cannot be used for forming medium and thick plate hook face parts. The method is based on a mold with the adjustable dispersed type molded face, the mold molded surface is adjusted step by step to conduct multi-step forming, and the shapes of the hook face formed in all forming steps are gradually changed, so that the deformation amount of plates in all forming steps is smaller, and the corrugation defect is avoided; and after multi-step oppositely-pressed forming is carried out on the plates, the large-curvature three-dimensional hook face parts are obtained. The method is suitable for forming the medium and thick plate hook face parts and also suitable for forming the thin-plate hook face parts.

The present invention provides a rapid preparation method of a titanium copper lamellar electrode composite material, which comprises the steps that: (1) copper foils, aluminum foils and titanium foils are superposed to form unit bodies, and one unit body is put on an ultrasonic quick-consolidating moulding work table; (2) an ultrasonic quick-consolidating moulding work table substrate is pre-heated to a temperature between 50 DEG C and 200 DEG C, and consolidating preparation is started and a metal foil material is formed; (3) the next unit body is put on the metal foil material, and the consolidating preparation is carried out by using the same parameters with the step (2) and the metal foil material is formed; and (4) the step (3) is repeated and after a predetermined thickness is reached, corner waste materials are milled and removed and the titanium copper lamellar electrode composite material is obtained. The titanium copper lamellar electrode composite material is prepared in the low temperature and is energy saving and environment-friendly. The cost of the raw materials is low. The titanium copper lamellar electrode composite material is prepared through solid-state physical metallurgical bonding. Diffusion layers are thin and by-products are few. The equipment cost is low because no vacuum devices or gas protection devices are used. The production period is short and the production efficiency is substantially improved. The precision and the yield are high.

The invention discloses a temperature control device and method for additive manufacturing. According to the temperature control device, a front preheating part is arranged at the front end of a printing head, and a rear cooling part is arranged at the rear end of the printing head. Before a formed part enters a printing position, the difference between the surface temperature of the formed part and the temperature of a printing portion can be reduced, and the frequency of the phenomenon that due to the large temperature difference, the organizations of the formed part are not uniform can be reduced. Due to the fact that the rear cooling part is arranged behind the printing head, the formed part can be rapidly cooled by the cooling gas after printing is accomplished, the situation that dueto the fact that the temperature is too high, the formed part is oxidized by the surrounding air is avoided, and the surface quality of the formed part is improved. According to the temperature control system and method for additive manufacturing, on the basis of control over the temperature of a molten pool in the additive manufacturing deposition process and the cooling speed in the solidification process, the front preheating device and the rear cooling device are added, and therefore zone control of the temperature field of the formed part is achieved, the forming defect is avoided, the distribution of the temperature field in the additive manufacturing process is improved, and the internal property of the formed part can be improved.

The invention discloses a roll forming method for cobalt-based superalloy thick-wall ring forgings. The roll forming method comprises the following steps: designing an intermediate billet into specially-shaped ring billets each of which is provided with a lug boss close to the inner wall; calculating the size of each specially-shaped billet according to an isovolumetric principle; designing a special die according to the shape and size of each specially-shaped ring billet; heating a cobalt-based superalloy rod to a deformation temperature, carrying out upsetting, punching and pre-rolling, and then manufacturing the cobalt-based superalloy rod into specially-shaped ring billets under the action of the special dies; heating the specially-shaped ring billets to the deformation temperature again, and rolling the specially-shaped ring billets into the thick-wall ring forgings by matching with appropriate rolling parameters. According to the method disclosed by the invention, the defects of grooves, folding and the like occurring in the thick-wall ring forging rolling process can be effectively overcome, and the rolling quality of the thick-wall ring forgings can be improved. The roll forming method can be used for roll forming of the thick-wall ring forgings.

The invention relates to the photovoltaic field, and provides a solar cell and a preparation method therefor, and the method comprises the following steps: carrying out the doping processing of the surface of a semiconductor substrate, so as to form a doping layer which comprises a doping element with a first doping concentration; depositing a doped amorphous silicon layer comprising doped elements on the surface of the doped layer; selectively removing at least one region of the doped amorphous silicon layer; annealing the semiconductor substrate including the doped layer and the doped amorphous silicon layer so that the doped layer includes a lightly doped region having a first doping concentration and a heavily doped region having a second doping concentration, wherein the second dopingconcentration is greater than the first doping concentration; and performing post-processing on the annealed semiconductor substrate to prepare the solar cell. According to the solar cell and the preparation method thereof, the preparation process of the solar cell is simplified, and the cell conversion efficiency is improved.

Present invention relates to a machine which directly transfers pattern on wet, colour or natural-colour flocked fabric base before drying fabric flocked in colour or natural-colour flocked fabric production line, which is used in various sectors, and a process involving the said machine. The invention is characterized with followings as main components: acid-corrosion, patterned cylinder (15) which directly transfers pattern on fabric, an unpatterned cylinder (14), which turns on within water, a system (13) which adjust distance between cylinders, scrapping blade (17), vacuum brushes (18), high-pressure blowing apparatus and air system (19), a sensor system (23) which monitors edge of fabric, a system and motor (20) which moves body of machine to left or right side.

The invention discloses a roll forming method for a stainless steel thick-wall ring forged piece. The roll forming method comprises the steps that a middle blank is firstly designed into a special-shaped ring blank with a boss nearby the inner wall; all dimensions of the special-shaped ring blank are calculated based on the equivolumetric principle; a dedicated mold is designed according to the shape and dimensions of the special-shaped ring blank; after a stainless steel rod is heated to deformation temperature, upsetting, punching and pre-rolling are carried out, the special-shaped ring blank is manufactured under the action of the dedicated mold; the special-shaped ring blank is reheated to the deformation temperature, and is rolled into the thick-wall ring forged piece in cooperation with proper rolling parameters. According to the method, the defects of grooves, folding and the like occurring in the rolling process of the thick-wall ring forged piece can be effectively overcome, and the rolling quality of the thick-wall ring forged piece can be improved. The method is used for roll forming of the thick-wall ring forged piece.

The invention discloses a roll forming method for an alpha-beta two-phase titanium alloy thick-wall ring forged piece. The roll forming method includes the steps that an intermediate billet is designed to be a special-shaped ring billet with a boss arranged close to the inner wall; all dimensions of the special-shaped ring billet are worked out according to the equivolumetric principle; a special die is designed according to the shape and the dimensions of the special-shaped ring billet; after an alpha-beta two-phase titanium alloy bar is heated to a deformation temperature, the special-shaped ring billet is manufactured through upsetting, punching and pre-rolling under the effect of the special die; and the special-shaped ring billet is heated again to the deformation temperature, and then the special-shaped ring billet is rolled to obtain the thick-wall ring forged piece according to proper rolling parameters matched with the deformation temperature. By means of the method, the defects of grooves, folding and the like generated in the thick-wall ring forged piece rolling process can be effectively overcome, and the rolling quality of the thick-wall ring forged piece is improved. The method is used for roll forming of the thick-wall ring forged piece.

The invention discloses a method for rolling and forming alpha-phase titanium alloy thick-wall ring forging. The method for rolling and forming alpha-phase titanium alloy thick-wall ring forging comprises the following steps of: designing an intermediate blank to be a special ring blank provided with a lug boss close to an inner wall; calculating respective dimensions of the special ring blank according to an equivolumetric principle; designing a specific mould according to shape and dimensions of the special ring blank; preparing the special ring blank from an alpha-phase titanium alloy rod by using a specific mould after the alpha-phase titanium alloy rod is heated until the alpha-phase titanium alloy rod is heated at a temperature which can cause a deformation and is subject to upsetting, punching and pre-rolling; and reheating the special ring blank until reheating the special ring blank at the temperature which can cause a deformation, and rolling the special ring blank into the thick-wall ring forging matched with appropriate rolling parameters. According to the method for rolling and forming the alpha-phase titanium alloy thick-wall ring forging provided by the invention, defects such as recesses and folds arisen during the rolling of the thick-wall ring forging can be overcome efficiently, and rolling quality of the thick-wall ring forging can be improved. The method is used for rolling and forming the thick-wall ring forging.

The invention discloses a rolling forming method of a structural steel thick-wall ring forging. The method comprises the following steps: firstly designing an intermediate billet as a specially-shaped ring billet with a lug boss adjacent to the inner wall; calculating each size of the specially-shaped ring billet according to an equivolumetric principle; designing a special mold according to the shape and size of the specially-shaped ring billet; heating a structural steel bar to reach a deformation temperature, upsetting, perforating and pre-rolling the structural steel bar, and preparing the structural steel bar into a specially-shaped ring billet under the effect of the special mold; reheating the specially-shaped ring billet to reach the deformation temperature, and rolling the specially-shaped ring billet to form a thick-wall ring forging by matching with an appropriate rolling parameter. According to the method, the defects such as grooves, folding and the like in the rolling process of the thick-wall ring forging can be effectively solved, and the rolling quality of the thick-wall ring forging can be improved. The method is used for rolling and forming the thick-wall ring forging.

The invention provides a segment-by-segment forming method for a large curved surface adopting a discrete die. A large 3D curved-surface part is difficult in forming, and in a conventional integral stamping forming method, a large die is needed, large or extra-large table facet machining equipment is required, and therefore, the production cost of large 3D curved-surface parts is extremely high. According to the invention, a set of discrete profile adjustable die is adopted, a to-be-formed large curved surface is sequentially divided into a plurality of segments with size equal to that of the forming area of the die; during forming of each segment, the discrete die is divided into an effective forming area and a forming transition area; and by reasonably designing the profile shape of the die of the forming transition area, deformation of joint part of adjacent forming segments are in uniform transition, so as to avoid production of forming defects, and the large curved-surface part is finally obtained after segment-by-segment forming. The method disclosed by the invention only needs one set of discrete die, and with small equipment, large-size parts can be formed, and quick machining of large curved-surface parts with low cost can be achieved.

Provided is apparatus for fabricating materials, including: a first mold including a first forming unit pressing a first material, and a second forming mold arranged at a bottom surface of the first forming unit to have an opening exposing the first material and to form at least a part of the first material by being meshed at a part with the first forming unit; a second mold arranged at a bottom surface of the first mold to support a second material; and an interlocking mold including a fixing unit interposed between the first and second molds to fix the second material arranged at the second mold by pressing the second material, and an interlocking unit ascendably and descendibly coupled to the fixing unit to form the second material by pressing the second material in association with the forming of the first material.