366 results about "High stiffness" patented technology

A racket comprises a handle and a body connected to the handle. The body includes a core layer, a first surface layer, a first inner layer disposed so as to sandwich the first surface layer with the core layer, and a first outer layer disposed so as to sandwich the first inner layer with the first surface layer. The first inner layer is an elastic body. The first outer layer has a higher stiffness than the first inner layer. The core layer has a higher stiffness than the first inner layer.

The utility model provides a quick-dry cool stiff and smooth warp knitting fabric, which is formed by knitting at least two guide bars GB1 and GB2, yarns adopted by the guide bar GB1 are high mechanical elasticity synthetic fiber filaments with circular or special-shaped sections, the crimp shrinkage rate of the high mechanical elasticity synthetic fiber filaments must be greater than 25%, and the crimp shrinkage rate of the high mechanical elasticity synthetic fiber filaments must be greater than 25%. Yarns adopted by the GB2 guide bar are elastic polyurethane filaments, the thickness of the high-mechanical-elasticity synthetic fiber filaments is 20-50D, and the thickness of the elastic polyurethane filaments is smaller than or equal to 55D. The high-mechanical-elasticity synthetic fiber filaments with the special-shaped cross sections are adopted, the contact area between fibers and air is large, diffusion and evaporation of water on the surfaces of the fibers are facilitated, and a wearer has the experience of quick-dry and cool feeling after wearing the fabric; meanwhile, due to the high crimp rate of the high-mechanical-elasticity synthetic fiber filaments, the fabric can have high stiffness and smoothness; the fabric obtained by weaving the high-mechanical-elasticity synthetic fiber filaments and the elastic spandex filaments has good elasticity, and the wearing comfort of a user is improved.

The invention discloses a ternary topological mixed truss girder based on steel-mixed-cable cooperative stress, and belongs to the technical field of constructional engineering, the ternary topological mixed truss girder comprises at least one single body structure, each single body structure is composed of an upper concrete body, a middle truss assembly and a lower prestress assembly from top to bottom, and each middle truss assembly comprises a web member and an inclined strut; the multiple web members are distributed in a linear mode at intervals, and the inclined struts are arranged between every two adjacent web members. The lower prestress assembly comprises anchoring seats and anchor cables, the multiple web members are each provided with one anchoring seat, and all the anchoring seats are connected through the anchor cables. According to the ternary topology hybrid truss girder, high rigidity of a pressed area and high strength and light weight of a pulled area are achieved, meanwhile, differentiation reinforcement of a midspan area is achieved, and stress coordination of multiple components is guaranteed. The invention further discloses a construction method of the ternary topology mixed truss girder based on steel-mixed-cable collaborative stress.

The invention discloses a robot. The robot comprises a small arm, a large arm, a connecting rod, a balance rod, a first linear driving device and a first driving rod. One end of the big arm is rotatably connected with the small arm; one end of the connecting rod is rotatably connected with one end of the small arm; one end of the balance rod is rotatably connected with one end, far away from the small arm, of the large arm; the first linear driving device comprises a first moving part; one end of the first driving rod is rotatably connected with the first moving part, and the other end of the first driving rod is rotatably connected with the balance rod; and the first linear driving device is configured to drive the first moving part to linearly move so as to drive the small arm to rotate relative to the large arm under the limitation of the connecting rod and the balance rod through the first driving rod. According to the mode that high-rigidity linear motion is converted into rotation, the transmission rigidity between the large arm and the small arm is increased, the stability of the robot in the machining process is improved, and the machining quality and machining efficiency of parts are improved.

The batten type water lubricated bearing comprises a shaft sleeve and a plurality of composite battens which are installed on the inner wall of the shaft sleeve at intervals in the circumferential direction of the shaft sleeve, and the composite battens comprise the first battens installed in a bearing area of the bearing and the second battens installed in a non-bearing area of the bearing. A through type variable cross-section groove is formed in the side, away from the ship stern shaft, of the first batten in the length direction of the first batten, and the cross-section area of the variable cross-section groove is gradually increased from the bow to the stern. The invention further discloses an assembly method of the batten type water lubricated bearing. The first batten is arranged in the bearing carrying area and provided with the variable cross-section groove, so that the rigidity of the first batten is gradually reduced in the direction from the bow to the stern, axial gradient rigidity distribution is formed, the low-rigidity area at the stern end can adapt to deformation of the stern shaft to be adjusted in a self-adaptive mode, local stress concentration is reduced, and the stability of the stern end is improved. And a high-rigidity area at the bow end maintains necessary bearing strength, so that the axial load of the bearing is homogenized as a whole.

The invention belongs to the technical field of spacecraft unfolding mechanisms, and discloses an unfolding mechanism locking device which comprises a first hinge structure, a second hinge structure and a self-locking assembly. The first hinge structure and the second hinge structure are connected in a relatively rotatable mode and are connected to the two deployable parts of the deployable mechanism respectively. The self-locking assembly comprises a locking seat and a locking pin, the locking seat is arranged on the first hinge structure, and the locking pin is arranged on the second hinge structure in a floatable mode. In the process that the second hinge structure rotates from the moving state to the locking state relative to the first hinge structure, the locking pin abuts against the locking base and moves along the locking base. And after the second hinge structure rotates to a locking state relative to the first hinge structure, the locking pin extends into and is locked in the locking seat. According to the unfolding mechanism locking device, the structure can be simplified, and high-rigidity and efficient locking can be provided for the two unfolding parts of the unfolding mechanism.

The present invention relates to the field of robotics. The purpose is to provide a redundantly driven planar two-degree-of-freedom parallel grinding robot, which should have the advantages of simple structure, high rigidity, and no singularity. The technical solution is a motion mechanism of a redundantly driven planar two-degree-of-freedom parallel grinding robot, characterized in that: the parallel mechanism includes a moving platform and a first branch, a second branch, and a third branch connected in parallel between the frame and the moving platform; the first branch includes a first guide rail, a first slider, and a second connecting rod and a third connecting rod connected in parallel at both ends through a rotating pair respectively; the second connecting rod and the third connecting rod are equal in length and arranged in parallel with each other; the axes of the rotating pair are parallel to each other and perpendicular to the axis of the first guide rail.

The invention relates to the field of woven materials, in particular to a fiber hybrid woven composite material based on bionic multistage gradient design. The material is obtained through material gradient design, structure gradient design and interface gradient design. The material comprises a surface layer high-rigidity area, a transition area and a core high-toughness area, wherein the surface layer high-rigidity area adopts carbon fibers I as warp and weft yarns; in the transition area, basalt fibers I are adopted as weft yarns, carbon fibers II are adopted as warp yarns, and Z-direction yarns are aramid fibers I; warp yarns of the core high-toughness area are basalt fibers II, and weft yarns and Z-direction yarns of the core high-toughness area are aramid fibers II. The defects of stress concentration, insufficient interlayer toughness, interface slippage and the like existing in traditional plain / twill weaving are effectively overcome. According to the design, on the premise that the cost is kept controllable, the interlayer performance, the impact resistance and the energy absorption characteristic of the composite material are remarkably improved by optimizing the three-dimensional combination mode of the warp yarns, the weft yarns and the Z-direction yarns at each stage, and the synergistic enhancement of mechanical properties is achieved.

The invention discloses a nano-modified fiber reinforced 3D printing magnesium phosphate cement-based material as well as a preparation method and application thereof. The material is prepared from the following components in parts by weight: 40 to 70 parts of dead burned magnesium oxide, 10 to 25 parts of basic hydrogen phosphate, 5 to 25 parts of silica fume, 30 to 60 parts of fine aggregate, 10 to 30 parts of water, 0.1 to 1 part of fiber dispersing agent and 0.5 to 5 parts of nano modified fiber, the surface activity of the fiber is remarkably improved through a nano modification process, active SiO2 sites attached to the surface of the fiber are activated by using an alkali solution, and a hydration product is generated in situ, so that the interface bonding strength between the fiber and a cement matrix is enhanced, and the surface strength of the fiber is improved by relying on the high-rigidity characteristic of the fiber. The yield stress, thixotropic property and constructability of the material are effectively improved, structural deformation in the printing process is remarkably inhibited, and the 3D printing material has excellent rheological property, strengthened mechanical property and tough fiber-matrix interface bonding property.

The present invention discloses a space deployable unit and a large-scale deployable platform. The space deployable unit is a symmetrical multi-closed loop mechanism, including a first platform, a second platform, and a plurality of planar 4R branches connected to the first platform and the second platform; the planar 4R branch has a first connecting rod, a second connecting rod and a third connecting rod, one end of the first connecting rod is connected to the first platform through a first hinge point, the other end of the first connecting rod is connected to the second connecting rod through a second hinge point, one end of the third connecting rod is hinged to the second connecting rod through a third hinge point, and the other end of the third connecting rod is connected to the second platform through a fourth hinge point; wherein the rotation axes of the revolving pairs formed at the first hinge point, the second hinge point, the third hinge point and the fourth hinge point are parallel to each other; the second connecting rods in adjacent planar 4R branches are connected by two symmetrically distributed planar 3R branches. The present invention has the advantages of good symmetry, high rigidity, light weight, structural stability and high reliability.

The embodiment of the utility model provides an artificial shuttlecock which comprises a shuttlecock skirt and a shuttlecock head, the shuttlecock skirt comprises a plurality of artificial feathers and at least two supporting coils, each artificial feather comprises a feather stem and a feather leaf, each feather stem comprises a feather root part, a feather trunk part and a feather branch part, and each feather leaf comprises an inner feather leaf part, an outer feather leaf part and a bonding layer; the inner feather leaf and the outer feather leaf are bonded together through a bonding layer, and the feather trunk part and the feather branch part are wrapped by the inner feather leaf and the outer feather leaf; the feather root part is arranged in the ball head; the feather stem is made of one-way continuous special fiber reinforced plastic, the tensile and bending strength of the feather stem is higher than 0.8 Gpa, the tensile and bending modulus of the feather stem is higher than 15 Gpa, the thickness of the cross section of the feather root part and the thickness of the cross section of the feather stem part are larger than 0.65 mm, the bending resistance coefficient of the cross section is larger than 0.09 mm < 3 >, and the feather leaf is made of a foaming plastic sheet with low density, high strength and high rigidity. The artificial shuttlecock provided by the embodiment of the utility model has flight performance and appearance which are very close to those of a shuttlecock made of natural feathers, and has better hitting resistance.

The utility model discloses a variable-rigidity high-reliability shock absorber which comprises a gasket, a low-rigidity shock absorption ring, a high-rigidity shock absorption ring, a low-rigidity shock absorption column, a high-rigidity shock absorption column and a sleeve. The section of the sleeve is in an inverted-T shape, the sleeve comprises a hollow cylinder and a circular ring fixed to the lower portion of the hollow cylinder, the hollow cylinder is sleeved with the low-rigidity vibration reduction column and the high-rigidity vibration reduction column, the outer diameter of the low-rigidity vibration reduction column, the outer diameter of the high-rigidity vibration reduction column and the inner diameter of a supporting lug hole of a vibration-reduced object are the same, and the outer diameter of the low-rigidity vibration reduction column is larger than the inner diameter of the supporting lug hole of the vibration-reduced object. The low-rigidity vibration reduction column and the high-rigidity vibration reduction column are installed in a supporting lug hole of an object subjected to vibration reduction in a combined mode, and the gasket and the sleeve are installed in a combined mode. The shock absorber disclosed by the utility model has the characteristic of variable stiffness, can adapt to different working conditions, and can meet the comprehensive shock absorption requirements of small load in orbit of space equipment and large load launched along with a rocket, and the comprehensive shock absorption requirements of small load of airborne weapons in hanging flight along with an airplane and large load in autonomous flight after launching.

The invention discloses a high-rigidity three-degree-of-freedom anthropomorphic joint driven by passive decoupling of a rope. The anthropomorphic joint comprises a supporting frame and two sets of rope driving assemblies arranged on the two sides of the supporting frame. The rotary rope drive assembly is arranged at the front end of the supporting frame, the parallel mechanism assembly is installed at the front end of the rotary rope drive assembly, and the motion decoupling assembly is installed at the central axis position of the whole joint. Wherein the two rope drive assemblies are frame bodies which are driven by ropes to move front and back; the rotary rope drive assembly is a rotary table driven by a rope to rotate around the axis of the supporting frame, and the joint rotary freedom degree is achieved. According to the parallel mechanism assembly, two sets of motion branch chains are combined with frame bodies on the two sides to control pitching and yawing of the movable platform. And passive decoupling between the rotary motion and the pitching and yawing motion of the movable platform is realized through the motion decoupling assembly. According to the three-degree-of-freedom anthropomorphic joint, the three-degree-of-freedom driving ropes are passively decoupled, high rigidity is still kept under the condition that a low-load rope is used, the structural design is compact, the characteristic of decreasing progressively from the near end to the far end is shown, and the three-degree-of-freedom anthropomorphic joint is mainly used for wrist joints and ankle joints of anthropomorphic robots.

An annular cantilever beam spring is capable of exhibiting low friction and hysteresis and stiffness and specifically stiffness / volume far exceeding currently available COTS springs. The spring includes first and second sets of N stand-offs evenly positioned around opposing top and bottom surfaces of a flat annular beam at 360 / N degree intervals and angularly offset with respect to each other by 360 / 2N degrees such that each said stand-off is evenly spaced between adjacent pairs of stand-offs on the opposing surface. The first and second sets of stand-offs are responsive to opposing axial loads to deflect the flat annular beam axially at each stand-off in opposing directions to induce a curvature to the annular beam and store energy in the beam. The spring stiffness is determined by the elastic material properties of the flat annular beam, not the initial geometry as is common with the COTS springs.

The utility model discloses a sofa front backrest with high stiffness. The sofa front backrest comprises a sofa frame, elastic strips and filling strips, the sofa frame structurally comprises side plates, a rear plate, a cross beam and a bottom plate. The elastic strips comprise the first elastic strip with the two ends arranged on the different side plates and the second elastic strip with the two ends connected with the bottom plate and the cross beam. And the first elastic strip is arranged along the outline of the side plate. And the second elastic strip is arranged below the first elastic strip. The filling strip is arranged on the sofa frame, is positioned between the first elastic strip and the second elastic strip, and is fixedly arranged on the second elastic strip. According to the sofa front backrest with high stiffness, the stiffness of the sofa front backrest is improved by arranging the filling strips on the elastic strips and the shapes of the filling strips.

The present invention discloses a passive anti-shock parallel platform, comprising a dynamic platform, a variable damper, a variable stiffness isolator, a static platform, a lower ball seat, an overshoot protector, and an upper ball seat. The dynamic platform is connected to an inertial navigation device, and the static platform is connected to a ship hull. The dynamic platform and the static platform are connected via a variable damper and a variable stiffness isolator. The lower ball seat is disposed on the surface of the static platform, and the upper ball seat is disposed on the surface of the dynamic platform. Through the synergistic effect of the variable damper and the variable stiffness isolator, the present invention enables the platform to efficiently absorb and consume impact energy. The damping force of the variable damper increases with the increase in displacement of the offset equilibrium position, effectively weakening the response of the dynamic platform and quickly helping it return to the equilibrium position. The multi-stage vibration isolation design of the variable stiffness isolator enables the platform to absorb the initial impact energy with a lower stiffness when impacted, and then limit the generation of large displacement with a higher stiffness, further improving the impact resistance.

The invention relates to the field of humanoid robots, in particular to a two-connecting-rod driving mechanical joint simulating rotation of human soles. According to the two-connecting-rod driving mechanical joint simulating rotation of the human foot sole, on the basis that high rigidity, movement precision and bearing capacity are guaranteed, swinging of the human foot sole is simulated by adding one freedom degree, and the two-connecting-rod driving mechanical joint is simple in structure and good in supporting performance. According to the technical scheme, the invention discloses a two-connecting-rod driving mechanical joint simulating rotation of a human sole. The top end of the shank is connected with a knee joint, the foot body is connected to the bottom end of the shank through a first hooke joint, and the sole is connected with the foot body through a first rotating pair. The sole driving branch is connected between the foot main body and the sole; and the two ankle driving branches are positioned on the left side and the right side of the shank and are respectively connected with the shank and the foot main body.

A stack structure (90), a display module (2), an electronic device (1), an impact-resistant layer and a preparation method, relating to the technical field of display. The stack structure (90) comprises a protective layer (91) and impact-resistant layers. The elastic modulus of each impact-resistant layers is less than the elastic modulus of the protective layer (91), the hardness of each impact-resistant layer is greater than the hardness of the protective layer (91), and / or the rigidity of each impact-resistant layer is greater than the rigidity of the protective layer (91). The protective layer (91) and the impact-resistant layers are connected by bonding or in other manners. Therefore, the compression resistance characteristic of a high-hardness and / or high-rigidity material is combined with the impact resistance characteristic of a high-elastic-modulus material, to improve the reliability of the stack structure (90). The stack structure (90) is directly connected to a display screen (20) by means of an adhesive layer, such that a display surface layer + cover plate structure is not required any more, and the architecture of the electronic device (1) can be simplified.

The present invention discloses a concentric circle-based six-degree-of-freedom adjustable dynamic variable stiffness device, comprising an upper platform, an upper mounting angle seat, an adjustable dynamic variable stiffness mechanism, a lower mounting angle seat and a lower platform. The upper end of the adjustable dynamic variable stiffness mechanism is connected to the upper platform via the upper mounting angle seat, and the lower end of the adjustable dynamic variable stiffness mechanism is connected to the lower platform via the lower mounting angle seat. The device is based on a multi-degree-of-freedom parallel configuration and is composed of six identical adjustable dynamic variable stiffness mechanisms. The adjustable dynamic variable stiffness mechanism can be adjusted to two states: adjustable dynamic low stiffness and adjustable dynamic high stiffness, thereby forming an adjustable dynamic variable stiffness mechanism.

The invention relates to the technical field of CNC machine tools, and discloses an electric actuator for a CNC machine tool, the electric actuator comprises a harmonic reducer, the right end face of the harmonic reducer is fixedly connected with a motor shell, and the right end face of the motor shell is fixedly connected with a bottom shell. According to the electric actuator for the CNC machine tool, through the application of the harmonic reducer, high-precision and high-rigidity transmission is achieved, the requirements of the machine tool for position precision and dynamic response in the complex machining process are met, the hollow shaft enables the actuator to be compact in structure, electrical elements can be conveniently integrated into the limited space of the CNC machine tool, nitrile rubber and fluororubber are selected as the sealing rings, and the sealing performance is good. Oil resistance and solvent resistance under different working conditions are respectively guaranteed, the cable connector is made of engineering plastics, durability and appearance quality of the actuator are improved while electrical performance is guaranteed, the structural strength of the actuator is enhanced due to the design of the support and the reinforcing ribs, the actuator can bear larger load and vibration, and overall reliability is improved.

The rigidity improving device comprises a wedge block and a screw, the wedge block is a block-shaped body, the two sides of the wedge block in the width direction are both provided with radians, and the radians of the two sides of the wedge block are consistent; the section of the wedge block is an inverted right trapezoid; one side of the wedge block in the width direction is a vertical surface, the vertical surface of the wedge block is a working surface, and the working surface faces the excircle surface of the main shaft; the other side of the wedge block in the width direction is an inclined surface, the inclined surface of the wedge block is a second working surface, and the second working surface is matched with the inclined surface of the workbench base; the two sides of the top of the wedge block in the length direction are each provided with a combining hole in the vertical direction, and the interiors of the combining holes are each in threaded connection with a screw. A dismounting hole in the vertical direction is formed in the middle position of the top of the wedge block between the two fastening holes; the six wedge blocks are evenly arranged in the circumferential direction of the main shaft at intervals. The rigidity of the main shaft can be effectively guaranteed and improved, and meanwhile the working precision and stability of a machine tool are guaranteed.

The invention relates to a variable impedance control method for a wrist joint rehabilitation training robot, and the method comprises the steps: constructing a self-adaptive reference stiffness correction model, inputting the rehabilitation score of a patient and the real-time muscular tension of each motion dimension of a wrist joint, and outputting the self-adaptive reference stiffness of each motion dimension; constructing a composite cost function which comprises a contact force safety threshold penalty term model and an impedance parameter change rate penalty term model; and constructing an uncertainty weighted correction model, inputting the composite cost value, the state prediction result and the patient rehabilitation score, and outputting the weighted instantaneous cost. Through the composite cost function and the dynamic impedance adjustment strategy, the impedance adjustment characteristic of the human arm is simulated, high-rigidity rapid approaching in the non-contact stage, low-rigidity high-damping buffering in the contact stage and low-rigidity low-damping compliant control in the stable stage are achieved, and the training comfort and safety are improved. According to limb impedance characteristics, rehabilitation stages and training tasks of patients, personalized requirements and dynamic rehabilitation scenes of different patients can be adapted.

The utility model belongs to the field of aircraft structure design, and particularly relates to a high-rigidity shear angle sheet structure which comprises a turned-over edge, a web plate, vertical ribs and edge strips. The flange, the vertical ribs and the edge strip define a whole ring structure, the web plate is integrally connected to one end of the whole ring structure, the flange is located on the outer side of the whole ring structure, the two sets of vertical ribs are symmetrically arranged on the two sides of the flange, and the edge strip is correspondingly arranged on the inner side of the whole ring structure; the outer walls of the vertical ribs are connected with the stringer, and the vertical ribs are arranged between the adjacent vertical ribs on the two sides of the stringer. The turnup, the web plate, the vertical rib, the edge strip and the supporting column are designed to be equal in height at the notch of the stringer, so that a thin neck structure is avoided. When the load is large, the phenomenon of stress concentration on the shearing angle piece is avoided. The rigidity of the wing rib at the position of the shearing angle piece is improved by changing the structural form among the traditional wing rib shearing angle piece, the edge strip and the supporting column, and then the structural strength requirement is met.

The utility model provides a kind of arc hollow injection molding part, including hollow injection molding part main body, integrated guide rail seat and arch truss, hollow injection molding part main body is opened with arc cavity, arch cavity is integrally injection molded with arch truss, arch truss left and right ends are integrally provided with connecting bent plate, this design solves the single function of the known arc hollow injection molding part inside, and single-layer hollow structure is directly formed by traditional injection molding process, there is no reinforcing rib or support structure inside, leading to insufficient rigidity, prone to deformation or cracking problem, the utility model is through built-in arch truss structure, imitates bridge mechanics principle, with least material greatly improves the bending and torsional stiffness of part along radian direction, effectively prevent deformation and vibration, realize the unity of light weight and high stiffness, again cooperate integrated type clamping groove guide rail to allow wiring harness, sensor or other functional module can be directly slidably installed without additional tool, assembly efficiency is very high.

This invention discloses a method for near-net-shape forming of complex thin-walled irregular-shaped rings based on a dissimilar material cladding, relating to the field of material plastic forming technology. The method includes: determining the required blank material and cross-sectional allowance of the same material for ring rolling forming of the target ring; determining the dissimilar material cladding based on the cross-sectional allowance; the dissimilar material having a higher stiffness than the blank material; fabricating the blank material and the dissimilar material cladding; covering the blank material with the dissimilar material cladding and performing ring rolling to obtain an initial ring; and removing the cladding from the initial ring to obtain the target ring. This invention solves problems such as buckling instability, loss of dimensional accuracy, uneven wall thickness, excessive ellipticity, and large subsequent machining and low material utilization under large allowance design during the rolling process of thin-walled rings. It achieves high-precision near-net-shape forming of large-diameter, thick-walled titanium alloy irregular-shaped rings, improving material utilization and reducing material costs.

A powered base assembly includes first and second structures that are operably interconnected by at least three legs that can include electrically-powered linear actuators. Each electrically powered actuator includes a housing and a rod associated with the housing. Each rod is connected to one of the first and second structures by a swivel joint having two degrees of freedom, and each housing is connected to the other of the first and second structure by a swivel joint having one degree of freedom. The linear actuators can be actuated to thereby change at least one of an angular position of the first structure relative to the second structure and a distance of the first structure, relative to the second structure. In this way, the base assembly may be used for leveling or moving a payload placed on the first structure; the payload weight is transferred linearly through the legs to the second structure. The configuration of the legs and the second structure enable to the second structure to be placed on a surface to support the base assembly while minimizing the bending moment on the second structure.

The invention belongs to the field of black metal materials, and particularly relates to high-toughness and high-rigidity saw blade steel and a manufacturing method thereof. The steel comprises the following chemical components in percentage by weight: 0.42 to 0.55 percent of C, 0.2 to 0.4 percent of Si, 0.9 to 1.4 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.5 percent of Cr, 0.0005 to 0.0030 percent of B, less than or equal to 0.3 percent of TiB2, 0.010 to 0.015 percent of B / TiB2 and the balance of Fe and inevitable impurities. According to the saw blade steel, the rigidity is larger than or equal to 9005N / m, the yield strength is larger than or equal to 1217MPa, the tensile strength is larger than or equal to 1580MPa, the ductility is larger than or equal to 17%, the room-temperature impact energy AKV is larger than or equal to 96J, the hardness is 42-48HRC, and the quenching hardness of a tooth tip is larger than or equal to 58HRC.