48results about How to "Reduce forming difficulty" patented technology

A forming method and forming mold for a semi-closed thin plate part, the forming mold includes a base and an inner tire, the base is provided with a concave cavity matching the shape of the bottom of the part, and the inner tire contains a left inner tire , the right inner tire and the support core, place the bent part on the cavity of the forming mold base, and then fill the left inner tire, right inner tire and support core in the bent part in turn Cavity, use positioning pins to fix and position the forming parts, and finally disassemble the forming mold, remove the process lugs, and correct the external dimensions of the parts.

The invention belongs to the technical field of manufacturing of metal bipolar plates for fuel cells, and particularly relates to a fuel cell titanium alloy bipolar plate electromagnetic-thermal composite forming device and method based on multi-time-sequence pulse current. A power module of the device comprises a plurality of sets of pulse power sources, the pulse power sources discharge a titanium alloy blank and a Helmholtz coil according to the time sequence, preheat the titanium alloy blank, generate pulse current in the titanium alloy blank, generate a pulse magnetic field in the Helmholtz coil, generate pulse electromagnetic force under the combined action of the pulse current and the pulse magnetic field, and drive the titanium alloy blank to rush to a mold, and forming of a titanium alloy bipolar plate is achieved. Through multi-level time sequence pulse current discharging, the plasticity and forming performance of titanium alloy are greatly improved through the thermal effect of the titanium alloy at high temperature, the electro-plastic effect of the pulse current and the high strain rate effect of the pulse electromagnetic force, and high-quality forming of the titanium alloy bipolar plate is achieved.

The invention discloses a warm-hot forming device and method for a metal and carbon fiber prepreg composite material component in the field of lightweight composite material forming and processing. An outer blank holder is arranged between a female mold and a male mold. The middle of the outer blank holder is provided with a downwards concave step positioning groove. The top of the step positioning groove can contain a steel plate, and an inner blank holder is placed at the bottom of the step positioning groove. The upper surface of the inner blank holder can contain a carbon fiber prepreg blank. A pushing plate is arranged under the male mold. The top ends of a first outer blank holder pushing rod and a second outer blank holder pushing rod can upwards jack the outer blank holder, and the bottom ends of the first outer blank holder pushing rod and the second outer blank holder pushing rod are fixedly connected to the pushing plate. The top ends of a first inner blank holder pushing rod and a second inner blank holder pushing rod can upwards jack the inner blank holder, and the bottom ends of the first inner blank holder pushing rod and the second inner blank holder pushing rod are each connected with a hydraulic cylinder. A third hydraulic cylinder is connected under the pushing plate. Large adjustable constraint resistance is applied to the steel plate. By means of the adjustable constraint resistance with a small effect on the carbon fiber prepreg blank, two heterogeneous component materials have the mutual matching forming capacities, and warm forming and hot forming are completed in a one-time stamping stroke.

The invention discloses a ceramic impeller and belongs to the technical field of rotary power pump equipment. According to the technical key points, an impeller body of ceramic materials is included and comprises a driving cover plate and a driven cover plate; a blade is arranged between the driving cover plate and the driven cover plate; one side of the driving cover plate is of a multilayer composite structure; and the multilayer composite structure comprises the driving cover plate, a first bonding energy absorption layer, a metal layer, a second bonding energy absorption layer and a seconddriving cover plate from inside to outside, wherein the second driving cover plate is of an independent structure and is made of ceramics or hard alloy, the metal layer is of a disc-shaped structure,a mandrel used for being connected with a spindle is connected to the radial inner side of the metal layer, and the first bonding energy absorption layer and the second bonding energy absorption layer are both filled with resin or a mixture of resin and abrasion resistant particles. The ceramic impeller has the characteristics that life is long, large torque can be borne, impact resistance is good, and large-scale production is easy to achieve.

The invention discloses an internal spinning forming method for a corrugated tube. The internal spinning forming method for the corrugated tube comprises the following steps that a tube billet is installed on a main shaft of a spinning machine, and a length thin tube is driven by the main shaft to rotate; the interior and the exterior of the tube billet are respectively provided with an inner spinning roller and an outer spinning roller for forming corrugations; the inner spinning roller and the outer spinning roller synchronously work; a feed rate of the inner spinning roller is paused until a gap between a convex molded surface of the inner spinning roller and a concave molded surface of the outer spinning roller is 1.1 to 1.3 times of the thickness of the tube billet, and the gap is kept for forming for 3 to 5 seconds until one position machining is finished; the inner spinning roller and the outer spinning roller synchronously move for one pitch of waves along the axial direction of the tube billet, and the steps are repeated until the corrugated tube of a required length is formed. The internal spinning forming method disclosed by the invention is higher in forming precision and low in forming cost; moreover, a metallographic structure is even and compact due to grain refinement and spinning deformation of the corrugated tube during a spinning process; meanwhile, grains are squashed and stretched to form a fibrous tissue in a spinning direction; product quality is high, and the service life is greatly prolonged.

The invention discloses a path planning method for hemispherical additive manufacturing of pressure vessels. The method includes two schemes. One is to use a fixed heat source to realize the deposition path only through a two-axis positioner. The center of the hemisphere coincides with the center of the turning axis of the positioner. Every time a layer is deposited, after the positioner is turned over by the same angle, the rotation axis of the positioner rotates to achieve layer-by-layer melting and deposition to form a hemisphere. The other is to use a movable heat source, which requires a robot or other actuators to hold heat sources such as plasma arcs and electron beams. The actuators and the two-axis positioner move in coordination. Every time a layer is deposited, the positioner turns over at the same angle. The actuator drives the heat source to follow the deposited hemisphere for a certain distance, and the rotary shaft of the positioner rotates to realize layer-by-layer melting and deposition to form a hemisphere. The invention can directly and quickly form the hemisphere of the pressure vessel with complex shape, and has high forming efficiency and low cost.

The invention discloses a process for forming a second radial inner ring on the inner wall of a thin-walled cylinder. The process includes the steps that (1) a semi-finished product with a first radial inner ring being formed in an upset-extruding mode is placed in a forming die; (2) a core die and a pressing die are mounted in an inner cavity of the thin-walled cylinder located in place, the opening of the thin-walled cylinder is subjected to upset-extruding through the pressing die to be plastically deformed, and overflowing metal is jointly limited by the core die and the pressing die to form one section of the second radial inner ring; (3) the core die and the pressing die are synchronously transferred to the next station along the inner wall of the thin-walled cylinder; (4) the pressing die conducts upset-extruding on the new station, another section of the second radial inner ring is formed, and upset-extruding is executed section by section in sequence; and (5) the core die moves inwards in the radial direction, a finished product is taken out, and another semi-finished product to be machined is placed in the forming die. According to the process, the method that upset-extruding is conducted section by section and forming is gradually achieved is adopted, upset-extruding forming of the thin-walled cylinder with the two internal radial inner rings is achieved, the upset-extruding process which breaks up the whole into parts is simple and convenient, and production can be easily organized.

A warm-hot forming method of a seamless tunnel pipe with the large radius-thickness ratio comprises the following steps that S1, an original pipe is selected; S2, a heating coil is used for heating; S3, a first corrugation is formed through a pipe blank 1; S4, the pressure of a flexible medium in the pipe blank is relieved, and an upper half mold and a lower half mold are opened; S5, a second corrugation is formed through the pipe blank 1; and S6, a third corrugation continues to be formed in a cavity B, the method of the third corrugation is consistent with the forming method of the first corrugation and the forming method of the second corrugation, and an Nth corrugation is formed in the same way till all corrugations are formed.