47results about How to "Does not affect stiffness" patented technology

The invention provides a mechanical arm. A slide part, a first rotating joint, a swing part and a second rotating joint are in sequential connection. The swing part comprises a connecting rod and a pull rod, two ends of each of the connecting rod and the pull rod are connected with the first rotating joint and the second rotating joint respectively to form four connection points, and sequential connection lines of the four connection points form a parallelogram. Therefore, the mechanical arm has a four-degree-of-freedom adjustment structure, and an operation direction of an implement arm mounted on the second rotating joint can be flexibly adjusted. Moreover, since a slider of a horizontal moving joint and a parallelogram mechanism are both positioned inside relevant parts, the mechanical arm is compact in integral structure, posture stability of the implement arm can be well kept without influences on integral rigidity of the implement arm, and flexibility of the mechanical arm is further improved.

The invention relates to a portable resistivity method advanced forecasting system applicable to a TBM. The system comprises a plurality of non-polarized electrodes, a terminal control box and an electrode cable series. The non-polarized electrodes are electrically connected with the terminal control box. The terminal control box is electrically connected with the electrode cable series. The non-polarized electrodes are arranged to be capable of stretching out of a TBM cutterhead hob hole and making contact with a tunnel face to detect front geological signals. The terminal control box receives the signals collected by the non-polarized electrodes and predicts a front geologic body. The potential difference between a surrounding rock mass, a shield and the terminal control box is reduced and / or eliminated through electrode cables. According to the system, detection of unfavorable geologic bodies such as a fault fracture zone, a soft and hard layered stratum, a water-bearing cave and an underground river is achieved according to geologic body resistivity difference.

The invention discloses a variable-damping vibration attenuation and noise reduction device for a valve and belongs to the field of vibration control. The combined variable-damping vibration attenuation and noise reduction device comprises a vibration transmission clamp, a magnetorheological fluid damper and a vibration collection analysis and control system. According to the device, the vibration transmission clamp mounted on a valve rod is used for transmitting vibration to the magnetorheological fluid damper to drive a movable shearing sheet to do shearing motion in magnetorheological fluid and to produce the damping force to offset the vibration energy of the valve; the vibration collection analysis and control system is used for monitoring the change of vibration parameters of the valve in real time, and adjusting the magnitude of the damping force of the damper according to the vibration parameters and in combination with the size and type of the valve and the structural parameters of the damper, so the active closed-loop control of the valve system vibration is realized. The combined variable-damping vibration attenuation and noise reduction device has the advantages that the vibration of different valves by different reasons can be effectively reduced, and the vibration and noise control of the valve under variable working conditions and opening degrees is realized.

The invention is a miniature total press probe and its making method. The probe is made up of a 3-rated outside circles, terraced tube whose head outside diameter is 0.2 mms. The ratio of these three circles' diameters is 1:2:5 while the ratio of the lengths is 1:(3-5):.(8-12).The producing method is to adopt the tiny electrical spark and the tiny electrolysis compound process to pack the parts once. The positioning accuracy can attain to 2 ums. The detailed craft is as follows:1 tiny electrical sparks processing craft;2 tiny electrolysis of pure water processing craft;3 tiny operation craft. Here are the advantages: provide the valid measure means for tiny fluid mechanics experiments; the special design of the probe guarantees that the valid measure dimension stays between millimeters and centimeters of total press distribution, and makes sure that the probe's rigidity can bear the strength of the tiny dimension-low Renault current of air without being impacted. The advantages are low cost and conveniently use.

The invention relates to a hoop rolling mill that adopts compound bowed roller hydro-cylinder. The upper and down working rollers of rolling machine are installed in the middle of the housing window through upper and down roller base. The hydro-cylinder is installed between upper and down roller base. The structure contains four compound bowed roller hydro-cylinders. Upper and lower ends of the hydro-cylinder identity are installed upper pressure board and down pressure board, which has piston rod and connecting stick. While working, the upper pressure board holds the upper working roller shaft base and the down pressure board holds the down working roller shaft base. The invention has the advantages of novel structure, small maintaining working and convenient to replace the roller.

The invention discloses an automatic energy recovering device for a driving axle of a heavy-duty truck. The automatic energy recovering device comprises a generator arranged on a frame, and a transmission device for transmitting a rotating speed in a wheel braking process to the generator, wherein the transmission device comprises a driving gear which is in separable normal-running fit with a wheel axle, and a driven gear which is in meshed transmission with the driving gear and is used for driving a rotor and a stator of the generator to move relatively to each other. The automatic energy recovering device can be used for recovering energy according to a braking process and assisting in braking, is suitable to be installed and used in an automobile, and is used for recovering energy, assisting in braking simultaneously and reducing and avoiding bearing high braking load, so that requirements are lowered, the service life is prolonged, and the manufacturing cost and using cost are lowered; the recovering device has a simple layout, and contributes to axle shell design, and the overall strength and rigidity of the axle are not influenced; and the recovering device has the characteristics of high reliability, long service life, low energy consumption, small size and light weight, and the production and manufacturing costs are low, and convenience is brought to installation, detachment and maintenance.

The invention relates to a reaction wheel bracket, which is applied in the technical field of general assembly of overall spacecraft. The reaction wheel bracket comprises a reaction wheel installing surface, a bracket installing bottom surface and two bracket supporting bodies, wherein four installing holes are distributed above the reaction wheel installing surface and are used for fixing connection between a reaction wheel and the bracket; and four reinforcing ribs are distributed under the reaction wheel installing surface. The reaction wheel bracket has the advantages that the condition that the normal direction of the reaction wheel is parallel to a star-structure plate is realized, and the reaction wheel installing surface and the bottom surface of the bracket adopt an installing mode with a 90-degree installing angle; and more parts are provided with the reinforcing ribs under the condition of avoiding the interference with the reaction wheel so as to improve the strength and the rigidity of the bracket.

The invention discloses a six-leg walking robot in parallel connection driven by rotation. The six-leg walking robot comprises a frame and six driving legs in parallel connection, wherein the six driving legs in parallel connection are uniformly distributed on the frame and symmetrically mounted, each of the driving legs in parallel connection has three freedom degrees relative to the frame, and the frame has six freedom degrees in three-dimensional translation and three-dimensional rotation under the coordination of the six driving legs in parallel connection; each of the driving legs in parallel connection comprises a driving mechanism in parallel connection and a leg mechanism, which are connected through an equivalent spherical hinge alpha, wherein the driving mechanism in parallel connection adopts a three branched hinge structure, and the leg mechanism adopts a four rod structure. The six-leg walking robot disclosed by the invention is simple and flexible in structure, light in mechanisms, stable to walk, good in adaptability and suitable for high-speed heavy-load transportation operation under non-structural topographic conditions.

The invention relates to a construction method for an assembled foundation pit support structure. A prefabricated reinforced concrete pile and a prefabricated box type component are mainly adopted. The prefabricated box type component comprises at least one standard piece. Trapezoid tenons 11 and trapezoid mortises 12 are formed in transverse and longitudinal connector positions of the standard pieces in a staggered manner. The prefabricated reinforced concrete pile comprises a front part 41, a rear part 42 and a pile head 43, wherein trapezoid tenons 412 and trapezoid mortises 413 are formed in the two sides of the front part in a staggered manner, and the tenons and the mortises of the prefabricated reinforced concrete pile and the tenons and the mortises of the prefabricated box type component are matched in size. A clamp support 421 used for supporting a prefabricated box type component located at the adjacent position is arranged at the position, close to the front part 41, of the rear part 42. After the whole support structure is spliced, compaction grouting is conducted on the position of a last anti-seepage grouting hole where the corresponding standard piece is arranged, and the anti-seepage grouting holes formed by the standard pieces and a pile body are fully filled with pulp from bottom to top. When it is observed that the pulp overflows out of an anti-seepage grouting hole channel of the top-layer standard piece, grouting is stopped.

The invention discloses a semi-active intelligent friction cylinder shock absorber of a vehicle suspension. The shock absorber comprises a first spindle, a main support spring, a sealing ring, a second spindle, a lower cylinder end cover, a cylinder body, a passive spring, a spindle friction ring, a piston ring, an auxiliary spring, a sliding sleeve, a cylinder friction material, slider friction materials, guide rail sleeves, controllable friction sliders, piezoelectric actuators and pre-tightening springs. The shock absorber is simple in structure and easy to implement. The shock absorber can be modified on the basis that the original suspension. Friction blocks and piezoceramic materials are relatively mature techniques developed on the market, and good economy, low carbon, environmental protection, high reliability and easiness in maintenance are achieved.

The invention provides a mechanical arm. A slide part, a first rotating joint, a swing part and a second rotating joint are in sequential connection. The swing part comprises a connecting rod and a pull rod, two ends of each of the connecting rod and the pull rod are connected with the first rotating joint and the second rotating joint respectively to form four connection points, and sequential connection lines of the four connection points form a parallelogram. Therefore, the mechanical arm has a four-degree-of-freedom adjustment structure, and an operation direction of an implement arm mounted on the second rotating joint can be flexibly adjusted. Moreover, since a slider of a horizontal moving joint and a parallelogram mechanism are both positioned inside relevant parts, the mechanical arm is compact in integral structure, posture stability of the implement arm can be well kept without influences on integral rigidity of the implement arm, and flexibility of the mechanical arm is further improved.

The invention provides an intelligent wind power blade mold, a preparation method of a blade mold, and a mold surface monitoring system. The intelligent wind power blade mold comprises an upper mold and a lower mold; the structure of upper mold comprises an inner structural layer, a heating layer and an outer structural layer; the structure of the lower mold is the same as that of the upper mold;the heating layer comprises a heat conductive grease layer, a copper pipe or a heating wire, and a fiber bragg grating; the inner structural layer is a cured structural layer formed by a vacuum infusion process using resin on a surfacing mat, an alkali-free cloth and a multi-axial multilayer fabric; and the preparation method comprises the following steps of preparation of the inner structural layer of the blade mold; preparation of the heating layer; and preparation of the outer structural layer. The mold surface monitoring system comprises a wind power blade mold and a fiber bragg grating demodulator; and the fiber bragg grating demodulator is connected with the fiber bragg grating of the wind power blade mold through a signal. According to the intelligent wind power blade mold, the related technical problems of how to accurately monitor the internal strain and temperature change of the mold are solved.

The invention discloses a point type separation satellite and rocket butt joint structure which comprises a butt joint device of a cavity structure and a transition block, the butt joint device is installed on the satellite and rocket butt joint face of a rocket support, the transition block is installed between a satellite main structure and the butt joint device, and the upper surface of the transition block makes contact with the lower surface of the satellite main structure. And the lower surface is contacted with the upper surface of the butting device.

The invention discloses a stator core, belonging to the technical field of motors. The stator core comprises: a yoke portion (1) and a plurality of tooth portions (2); the plurality of tooth portions(2) are evenly distributed on the inner side of the yoke portion (1) in the circumferential direction and extending in the radial direction of the yoke portion (1); a stator slot (3) is formed betweenthe two adjacent tooth portions (2); an end, close to the yoke portion (1), of the tooth portions (2) are provided with oil guide grooves (4) extended along the axial direction. The stator cores of the invention is provided with the oil guide grooves at the tooth portions to allow the cooling oil to conveniently enter the stator core through the oil guide grooves, increase the area of the coolingoil contacting the heat source, effectively improve the heat dissipation of the stator core without affect of the rigidity of the stator core and the interference assembly process between the statorcore and the casing; at the same time, the oil guide grooves are arranged at the tooth portions without increasing of the volume of the motor so that the motor can be lightweight.

The invention discloses a composite positive and negative roller bending device based on a six-high mill, comprising four roller bending cylinders. The four roller bending cylinders are respectively installed between an upper working roller bearing seat and a lower working roller bearing seat of the inlet and the outlet of the operation side and the inlet and the outlet of the transmission side, have a same structure and all consist of an upper pressure plate, a lower pressure plate, a cylinder cover, a fixed block, a cylinder body, a piston rod, a spherical cushion, a connecting rod, a guide key, a locking ring and a composite cylinder sleeve, wherein the cylinder body is installed in the fixed block, the upper end of the fixed block is connected with the cylinder cover, the cylinder cover is connected with the upper pressure plate, the upper pressure plate is installed in a T groove of the upper working roller bearing seat, a necking is arranged at the lower part of the cylinder body and is sleeved with the composite cylinder sleeve, the lower part of the composite cylinder sleeve is connected with the lower pressure plate, the lower pressure plate is installed in a T groove of the lower working roller bearing seat, the cylinder body, the cylinder cover and the piston rod form a roller bending hydraulic cylinder, the composite cylinder sleeve is connected with the piston rod, the spherical cushion, the connecting rod, the guide key and the locking ring to form a whole body and form a composite roller bending hydraulic cylinder, and the composite roller bending hydraulic cylinder can slide together with the roller bending hydraulic cylinder in the fixed block.

The invention discloses a micro-nano dual-mode detection processing module. The module comprises a Z-direction piezoelectric displacement table, a support, a capacitive displacement sensor, a capacitor fixing seat, an adjusting seat, a locking support, an upper fixing ring, a PZT vibration exciter, a lower fixing ring, a test screw, a flexible hinge, a baffle ring, a fixing nut and a probe; the capacitive displacement sensor is fixed on the capacitor fixing seat; the capacitor fixing seat is fixed above the adjusting seat; the upper fixing ring, the PZT vibration exciter, the lower fixing ring, the test screw, the flexible hinge, the baffle ring, the fixing nut and the probe are sequentially fixed below the adjusting seat; the probe is fixed on the flexible hinge through a fixing nut and atest screw; the adjusting seat is fixed on the locking support; the locking support is fixed on the bracket; and the bracket is fixed on the Z-direction piezoelectric displacement table. The module has online detection and servo machining functions, and compared with commercial AFM, the module has larger machining size and wider material application range.

The invention relates to the downward deviation problem during the jacking process of a steel jacking pipe and particularly relates to a detachable multi-angle steel jacking pipe deviation rectifyingdevice which comprises a concrete base and an arc-shaped steel plate tripod, wherein each of the concrete base at the lower part and the arc-shaped steel plate tripod at the upper part has the detachable function, is convenient to mount and is recycled; a support steel plate is clamped and connected between clamping grooves in corresponding positions between the lower bottom surface of an arc-shaped steel plate and the upper bottom surface of a bottom steel plate through the arc-shaped steel plate tripod; the support steel plate is clamped at different positions to adjust the angle between thearc-shaped steel plate and the bottom steel plate, so that the problem that the steel jacking pipe falls off to different degrees on engineering is further solved, and different-angle deviation rectification of the steel jacking pipe is realized with high flexibility and convenience; steel balls similar to abaci in shape are configured on the upper surface of a cambered surface steel plate, so that the front end of the steel jacking pipe can conveniently move on the cambered surface steel plate. The detachable multi-angle steel jacking pipe deviation rectifying device can better solve the problem about downward deviation during the jacking process of the steel jacking pipe.

The invention discloses an arrangement structure of reinforcing ribs for a back door trim panel. The arrangement structure comprises the back door trim panel, and longitudinal reinforcing ribs and transverse reinforcing ribs arranged vertically and horizontally on the back door trim panel in an intersecting manner. The arrangement structure is characterized in that the transverse reinforcing ribs are in a concave-convex form being higher on one segment and lower on the other, and the interval between every two adjacent concave segments is the distance between two continuous or three continuous longitudinal reinforcing ribs. By adopting the arrangement structure, deformation caused by the contraction difference between the reinforcing ribs and a main body in the cooling process of the back door trim panel can be reduced by reasonably optimizing the arrangement of the reinforcing ribs on the premise of not influencing the overall rigidity of parts, so that the effects of reducing the deformation of the back door trim panel and improving the trim quality are achieved.

The invention discloses a lightweight abnormal-structure radome of an unmanned aerial vehicle and a forming method of the lightweight abnormal-structure radome, and belongs to the technical field of unmanned aerial vehicle fittings. The lightweight abnormal-structure radome of the unmanned aerial vehicle comprises a cover body which is of an abnormal body structure, wherein outer skin of the coverbody is of a three-layer structure; each layer of the outer skin is manufactured from glass fibers or quartz fiber prepreg; and the inner skin of the cover body is of a two-layer structure, and eachlayer of the inner skin is manufactured from glass fibers or quartz fiber prepreg. The lightweight abnormal-structure radome solves the technical problems that the inner skin and the outer skin of thecover body adopt an equal-thickness design, rigidity and strength waste is caused, weight of the cover body is increased and processing cost is increased in the prior art. The outer skin of the coverbody is of the three-layer structure, and the inner skin of the cover body is of the two-layer structure, so that the outer skin and the inner skin are unequal-thickness structures, so that weight ofthe radome is relieved in case of guaranteeing wave-transmitting needs, rigidity and strength of the radome.

An abrasion-resistant efficient noise-damping circular saw blade comprises a saw blade substrate, wherein the saw blade substrate comprises a saw body substrate and saw teeth; and a central hole is formed in the saw body substrate. The circular saw blade is characterized in that a plurality of noise-damping slots are formed in the saw body substrate; a plurality of noise-damping slits are also formed in the saw body substrate; tooth slots are formed among the adjacent saw teeth, and comprise shallow tooth slots and deep tooth slots; grooves are formed in the saw teeth; the noise-damping slotsare circular and connected through the noise-damping slits; the noise-damping slits are arc-shaped; and the deep tooth slots are formed at intervals of 2 to 3 hollow tooth slots. The circular saw blade has an obvious weakening effect on vibration noise; through the combined connection between the noise-damping slots and the noise-damping slits, the slotting and slitting space of the circular saw blade can be effectively reduced and the rigidity of the circular saw blade can be improved; the saw teeth adopt a structure of different toot slot depths, so that aerodynamic noise can be effectivelyreduced; and meanwhile, cuttings can be effectively discharged from the deep tooth slots in the cutting process, the saw body substrate can be prevented from being abraded by the cuttings, and the service life of the circular saw blade can be prolonged.

The invention relates to a nested supporting structure having a position regulation function and the application of the nested supporting structure. The nested supporting structure comprises an internal supporting frame and an external supporting frame used for supporting and regulating the internal supporting frame, wherein the internal supporting frame is provided with a plurality of protruding parts protruding in the transverse X direction and the longitudinal Y direction; the external supporting frame comprises two oppositely distributed transverse extending parts extending in the transverse X direction and two oppositely distributed longitudinal extending parts extending in the longitudinal Y direction, so that the external supporting frame is molded to encircle the internal supporting frame along the periphery of the internal supporting frame, the external supporting frame is provided with openings respectively corresponding to the protruding parts of the internal supporting frame, so that the protruding parts of the internal supporting frame are nested into the openings of the external supporting frame, and the external supporting frame supports the internal supporting frame in a nesting form. A position regulating piece is arranged in each opening of the external supporting frame and acts on the corresponding protruding part of the internal supporting frame in the transverse X direction, the longitudinal Y direction and the vertical Z direction, so that the six degrees of freedom of the internal supporting frame is regulated.

The invention discloses a split type roller pin bearing with an asymmetric structure for a small aviation piston engine, and belongs to the field of small aviation piston engines. The split type roller pin bearing comprises a retainer and roller pins; the retainer is of a split type annular structure and is formed by splicing two asymmetric semicircular rings, and a plurality of roller pin horizontal grooves are evenly distributed in the circumferential direction of the circumferential surfaces of the two semicircular rings at the same angle; and each roller pin horizontal groove is rectangular and is used for mounting the roller pins, and the clearance fit is ensured. According to the split type roller pin bearing with the asymmetric structure for the small aviation piston engine, the retainer is of a split structure and can be conveniently installed on a crankshaft with the integral crank throw of the small aviation piston engine, due to the fact that the integral crank throw is goodin strength and rigidity, the structural design and the machining process of the crankshaft can be simplified while the strength and the rigidity of the crankshaft are guaranteed, and the crankshaftis compact in structure and light in weight.

The invention discloses an arrangement structure of reinforcing ribs for a back door trim panel. The arrangement structure comprises the back door trim panel, and longitudinal reinforcing ribs and transverse reinforcing ribs arranged vertically and horizontally on the back door trim panel in an intersecting manner. The arrangement structure is characterized in that the transverse reinforcing ribs are in a concave-convex form being higher on one segment and lower on the other, and the interval between every two adjacent concave segments is the distance between two continuous or three continuous longitudinal reinforcing ribs. By adopting the arrangement structure, deformation caused by the contraction difference between the reinforcing ribs and a main body in the cooling process of the back door trim panel can be reduced by reasonably optimizing the arrangement of the reinforcing ribs on the premise of not influencing the overall rigidity of parts, so that the effects of reducing the deformation of the back door trim panel and improving the trim quality are achieved.

The invention discloses a novel hot-rolled air filtering aggregate and a manufacturing method thereof. The novel hot-rolled air filtering aggregate is prepared from, by mass, 60- 80 percent of 15D polyester staple fiber, and 20- 40 percent of 7D modified polyester staple fiber. The usage temperature of the 15D polyester staple fiber is 120- 150 DEG C, the 7D modified polyester staple fiber has a skin-core structure, and a skin layer and a core layer account for 50 percent respectively; the usage temperature of the skin layer is 110-140 DEG C, and the usage temperature of the core layer is 120-150 DEG C; two fibers are processed by using a fiber mixing process, a mechanical carding and netting process and a heat setting and heat strengthening process to form a fiber net surface with certainstiffness. The novel hot-rolled air filtering aggregate and the manufacturing method thereof has the advantages that thermal bonding between fibers is directly utilized for curing and bonding, the rigidity of a product is not affected, fiber characteristics are kept intact, contact surface area between turbid gas and the fibers is increased, a good low pressure difference is maintained, and the service life of a filter is prolonged.

The invention discloses a barrel assembly of a barrel-rotating weapon, which comprises a barrel, a cover plate, a joint sleeve, a bearing ring, a positioning hoop, a positioning screw sleeve, a barrel hoop part, a barrel hoop fixing pin, and a muzzle device; the barrel and The joint sleeve is connected by thread; the outer circle of the body tube is provided with an anti-rotation plane, the cover plate is provided with a through hole, and the inner circular surface of the through hole is provided with one or several anti-rotation planes fitted with the anti-rotation plane on the body tube. Rotation plane; the cover plate and the barrel are fitted through the anti-rotation plane; each barrel is equipped with a positioning screw sleeve, a positioning hoop and a muzzle device, and the positioning screw sleeve ensures that the axis position is consistent, the bearing ring is installed around the front, and the positioning hoop is clamped Tighten the bearing ring and the positioning screw sleeve; the body pipe hoop part is connected and fixed with the bearing ring through the body pipe hoop fixing pin. The invention simplifies the assembly process, and improves the precision of the barrel itself without damaging the base body of the barrel. The barrel assembly of a rotating barrel weapon of the present invention is reliable in fixing, simple in structure, and good in assembly process.

The invention provides a wave-current hybrid drive miniature power generation and energy storage system and method for an ocean subsurface buoy, the wave-current hybrid drive miniature power generation and energy storage system comprises a driving device used for providing power, the driving device comprises a box body and a shaking pendulum, the box body is integrally installed in the subsurface buoy, and the shaking pendulum is installed in the box body; the output end of the shaking pendulum is connected with a gear speed increasing mechanism used for transmitting power. And an output shaft of the gear speed increasing mechanism is connected with an alternating current electric energy conversion and energy storage system for power generation and energy storage. When the device is under water, the device is pushed by ocean current, when the device floats on the water surface, the device is pushed by waves, the device can convert ocean current energy and wave energy into available electric energy, certain electric power is input into the storage battery for charging, and the submerged buoy is maintained to normally work for a long time and store energy.

The invention provides a terrestrial heat utilization system based on underground diaphragm walls. The system comprises the first underground diaphragm wall, the second underground diaphragm wall andan underground water layer. A water input pipe and a first water output pipe are arranged on the first underground diaphragm wall. A second water output pipe and a third water output pipe are arrangedon the second underground diaphragm wall. The underground water layer communicates with a high-pressure water pump through the water input pipe. The water output end of the high-pressure water pump is sequentially connected with a first electric shunting type valve, a first high-pressure heat energy converter, a second electric shunting type valve, a second high-pressure heat energy converter andthe third water output pipe. The other water output end of the first electric shunting type valve is connected with the first water output pipe through a first grid type heat exchanger, and the otherwater output end of the second electric shunting type valve is connected with the second water output pipe through a second grid type heat exchanger. The invention further provides a utilization method of the geothermal utilization system based on the underground diaphragm walls. The system has the advantages of being large in energy, easy to utilize and the like, terrestrial heat is utilized reasonably, and thus benefits can be brought to economy and environment.

The invention provides a magnesium alloy for bicycles, the components and mass fractions of which are as follows: the Mg content is 90-92%, the Al content is 3-5%, the Mn content is 3-3.5%, and the rest is Ca. The beneficial effect of the invention is that adding aluminum element to the material components of the magnesium alloy improves the elastic modulus of the alloy material without affecting the stiffness of the magnesium alloy.