736 results about "Mechanical press" patented technology

According to an embodiment of the invention, a mechanical press includes a transmission that comprises a first transmission and a second transmission coupled to the first transmission. The first transmission is for receiving mechanical movement from a first motor and to transmit mechanical movement to a ram. The second transmission is for modifying configuration of the first transmission in response to mechanical movement received from a second motor, and a profile of movement of the ram over a pressing cycle is affected by a profile of movement from the second motor over the pressing cycle.

The invention discloses a method for preparation of a bone hydroxyapatite-imitating bone repair material, nano hydroxyapatite ceramic powder and NH4HCO3 powder are mixed proportionally, after mixing, the powder is loaded into a gradient mold for mechanical pressing into a block pressed blank, the block pressed blank is put into a discharge plasma sintering furnace, heated to 950 DEG C and 1050 DEG C in the heating rate of 100 DEG / min, and then kept warm for 10-20min, and after demoulding, a nano scale bone gradient-imitating porous hydroxyapatite bone repair material is obtained. The nano scale bone gradient-imitating porous hydroxyapatite bone repair material is prepared by the method comprises outer and inner two layers, the porosity is 34% to 80%, and the pore scale is controllable in the range of 100-500mum, and the nano scale bone gradient-imitating porous hydroxyapatite bone repair material has the advantages of fine grain size, composition purity, no residual pore former, controllable mechanical properties and degradation rate and the like, and can be used as a good artificial bone tissue repair material.

The invention discloses a supporting wheel closed forging process and a forging die, and belongs to the technical field of forging. Blanking is conducted on round steel through a band sawing machine; heating is conducted on a bar material through a medium frequency induction heating furnace; jumping-up and preforging are conducted on the hot bar material on a l600T electric screw press, then the hot bar material is transferred to a 2500T electric screw press to be subjected to finish forging and forming through the closed forging die, and finally punching is finished on a 400T mechanical press; normalizing treatment is conducted on a forge piece generated after punching is conducted; the closed forging die adopted for the process comprises a lower cushion block (2), a lower male die (11), a lower base plate (3), a lower female die insert (5), a lower female die (4), an upper male die (6), an upper female die (7) and an upper cushion block (8). By means of the supporting wheel closed forging process and the forging die, burrs do not exist in the forged forge piece, and the total forge piece deformation area is reduced, so that the forging deformation force is lowered, the raw material utilization rate is increased, the subsequent trimming process is omitted, the product cost is lowered greatly, and product efficiency is improved remarkably.

Cold extrusion procedures for obtaining metal elements such as for example bushings, nuts or other elements with dead or through holes, screws, standard and special shape extruded or pressed products, etc. on a machining center comprising a series of hydraulic presses connected to each other with an automatic movement system. The final drilling or shearing of the elements is advantageously carried out by a dedicated drilling or shearing unit, working at high speed, which can consist of a vertical mechanical press. The use of the plant comprising several hydraulic presses together with the rapid drilling or shearing unit makes it possible to achieve a high level of productivity.

The invention relates to a servo mechanical press which comprises a stand shaped like a frame, and is characterized by further comprising a first synchronous servomotor, a second synchronous servomotor, a first retarding mechanism, a second retarding mechanism, a six-link type working mechanism and a guiding mechanism, wherein the first synchronous servomotor and the second synchronous servomotor are mounted on two sides of the stand in an eudipleural manner; the first retarding mechanism and the second retarding mechanism are mounted on two sides of the stand in an eudipleural manner; the six-link type working mechanism is mounted in the frame of the stand; an input end of the first retarding mechanism is coaxially arranged with an output shaft of the first servomotor; an output shaft of the first retarding mechanism is fixedly connected with an input end on the right side of a crankshaft of the six-link type working mechanism; an input end of the second retarding mechanism is coaxially arranged with an output end of the second servomotor; an output end of the second retarding mechanism is fixedly connected with an input end on the left side of the crankshaft of the six-link type working mechanism; the guiding mechanism is mounted in the frame of the stand; and a slide block at the output end of the six-link type working mechanism is positioned in the guiding mechanism and can move up and down. The invention provides the servo mechanical press, which has a simple structure, is convenient to control, can reduce the output torque and the required capacity of the servomotors, and can be built with large tonnage and low cost.

Can shells are produced with tooling installed on a single action mechanical press, and the tooling includes an upper retainer supporting a blank and draw die enclosing an outer pressure sleeve and an inner pressure sleeve surrounding a die center punch, all having air actuated pistons. The die center piston has an air reservoir connected by air passages which form air springs for the inner pressure sleeve, and the outer pressure sleeve receives the same controllable air as the reservoir or low pressure plant air supply. The inner pressure sleeve has a projecting nose portion which initiates the drawing of a cup and has contoured surfaces which mate with corresponding surfaces on a die core ring to form and clamp the chuckwall of the shell during downstroke of the press. A lower panel punch forms the center panel, panel wall and countersink of the shell during upstroke of the press.

The invention is concerned with the driving system that the switched reluctance motor servos the driving double toggle links mechanical press, it is: the switched reluctance motor is speed-down by the first-level strap in order to send the power to the synchronizer gear structure, the synchronizer gear structure drives the slipper to move by the same-axle concretion crank toggle mechanism, maintains the flywheel with the proper moment of inertia. The invention is with the low speed features during the punching moment and the high speed features during the return and feeding moment, which can achieve the flexibility control of the slider movement, simplify the structure of the pressing machine, and reduce the cost.

The invention relates to a high-strength pore-closed mullite material and a preparation method thereof. The material comprises, by weight, 30-84wt% of alumina raw material, 1-55wt% of alumina-silica raw material, 15-60% of silica raw material and 2-10wt% of additive. The preparation method includes: mixing the raw materials according to the above proportion, adding the additive, stirring well, and pouring into a die; performing mechanical pressing under 80-150MPa to obtain a blank, and drying the blank at 60-140 DEG C for 3-16h; putting the blank in a high-temperature kiln for calcining to obtain the high-strength pore-closed mullite material. Sintering in-situ pore forming technology is adopted, so that the high-strength pore-closed mullite material prepared by the method has the advantages of high closed porosity, high pressure-resistant strength and high refractoriness under load and can be used for a long time at high temperature of 1550-1700 DEG C.

An automatic temperature rise control device for a crankshaft and bearing bushes of a mechanical press comprises a machine body, the crankshaft, a first supporting sleeve, a second supporting sleeve, a connecting rod cover, a connecting rod, a first shaft end bearing bush, a second shaft end bearing bush and a connecting rod bush; an air circuit temperature control system and a temperature detection and control system are arranged on the machine body; the air circuit temperature control system comprises an air cooling machine arranged on the machine body; the air cooling machine is connected with an air distributor; the air distributor communicates with spiral grooves formed in inner walls of the first supporting sleeve, the second supporting sleeve, the connecting rod cover and the connecting rod through multiple air inlet pipes; the temperature detection and control system comprises a controller and multiple temperature sensors for detecting the temperatures of the first shaft end bearing bush, the second shaft end bearing bush and the connecting rod bush; the temperature sensors are connected with the controller through circuits; and the controller is connected with the air cooling machine through a circuit. The control device has the advantages that the working temperature of the bearing bushes is automatically controlled, the design clearance is reduced, the service life of the crankshaft and the service life of the bearing bushes are prolonged, the operation speed and precision of the crankshaft is improved, the production efficiency is high, the product quality is high, and the like.

A lever type mechanical downward pushing device of a mechanical press comprises a sliding block mounted on a machine body. Supports are mounted on the two sides of the sliding block correspondingly to be connected with vertical upper pull rods. The upper pull rods are connected with lower pull rods through adjusting nuts. The lower ends of the lower pull rods are fixedly connected with pull rod connectors. The pull rod connectors are rotatably and slidably connected with the outer ends of horizontally-arranged levers. The middles of the levers are rotatably connected with fulcrum seats arranged on the machine body. The other ends of the levers are in rolling connection with the lower bottom faces of a pushing seat. The upper end of the pushing seat is vertically and movably arranged in the machine body. A through hole is formed in the center of the pushing seat. An air cylinder is arranged at the bottom of the pushing seat. A piston rod of the air cylinder is mounted in the through hole. The upper end of the pushing seat is in matched connection with the lower end of an upper pushing rod. The upper end of the upper pushing rod is in matched connection with a worktable. The lever type mechanical downward pushing device has the advantages that synchronization is good, symmetrical balance is achieved, ejecting force is large, structure is simple, compactness is achieved, mechanical efficiency is high, manufacturing cost is low, maintenance is easy, environmental friendliness and energy saving are achieved.

Can shells are produced with tooling installed on a mechanical press, and the tooling includes an upper retainer supporting a blank and draw die enclosing an outer pressure sleeve and an inner pressure sleeve surrounding a die center punch, all having pistons. An air chamber is connected by air spring passages to the inner pressure sleeve piston, and the outer pressure sleeve receives the same air as the air chamber or lower pressure air. The die center punch has an insert which initiates the drawing of a cup, and the inner pressure sleeve and die center punch have contoured surfaces which mate with opposing surfaces on a die core ring to form and clamp the chuckwall of the shell during downstroke of the press. A panel punch has peripheral surfaces which form the panel wall and countersink of the shell during upstroke of the press.

The invention discloses a non-planar-long-and-thin-profile-machining-oriented self-adaptive linkage clamping device and method. One side of a tool block is provided with a machine tool caliber base. Two auxiliary groove limiting blocks are arranged on the machine tool caliber base. The top ends of the two auxiliary groove limiting blocks are provided with pressing blocks fixed through limiting bolts respectively. The pressing blocks are provided with sliding through holes. One ends of the pressing blocks stretch to the position above the tool block. The limiting bolts are provided with springs. A drive cylinder is arranged between the two auxiliary groove limiting blocks. The top of the drive cylinder is connected with a push rod with a main groove, a rotating lever is arranged in the main groove, and the main groove is provided with a limiting pin shaft penetrating through the main groove and connected with the rotating lever and capable of controlling the inclination angle of the rotating lever. According to the non-planar-long-and-thin-profile-machining-oriented self-adaptive linkage clamping device and method, the inclination angle of the rotating lever can be changed by rotating the limiting pin shaft, it is avoided that mechanical pressing plate clamping is originally conducted by tightening the bolts manually, the labor intensity of workers can be lowered, the auxiliary time is saved effectively, and the machining efficiency is improved.

In a mechanical press, the pressure (cylinder force) of a hydraulic pressure chamber of a cylinder-piston mechanism provided in a slide of the mechanical press can be variably controlled with a high responsiveness by a hydraulic pump/motor driven by an electric servomotor, in response to a cylinder force command corresponding to the press load command. Accordingly, even if a die height value is set to a value small enough to cause an overload, the press load can be restricted before the occurrence of the overload, and this can save the trouble of strictly adjusting the die height value. Further, pressure-application time in the vicinity of a bottom dead center can be lengthened, and a breakthrough phenomenon can be suppressed from occurring at the end of pressure application. Still further, because the overload does not occur, pressure oil is not relieved, so that the interruption of a press operation is avoided.

The invention discloses an optimized design method of a triangular toggle-rod working mechanism of a servo mechanical press. The triangular toggle-rod working mechanism comprises a crank AB, a connecting rod BCE, an upper toggle rod CD and a lower toggle rod EF, wherein a sliding block is established by a point F, the upper toggle rod CD and the lower toggle rod EF are unequal in length, the upper toggle rod CD is shorter than the lower toggle rod EF, a point D and the point F are located on a vertical line, and points B, C and E are used for establishing the triangular connecting rod BCE. The optimized design method of the triangular toggle-rod working mechanism includes the following steps: 1) building a parameterized mechanical model; 2) establishing a parameterized virtual prototype model; 3) analyzing sensitivity of each structure parameter; and 4) building an optimization model and solving. Through the optimized design, the triangular toggle-rod working mechanism has a higher force increasing ratio and can greatly decrease the driving torque required by the crank under the condition of guaranteeing compact machine-body mechanism, sufficient sliding-block stroke and single sliding-block movement downstream, thereby lowering the capacity and cost of a servo motor. The triangular toggle-rod working mechanism of the servo mechanical press, designed by the invention has a reasonable structure and is convenient and practical.

The invention relates to a method for controlling the compressor sliding block to stop at dead position. Wherein, it uses the rotation coder as the crank angle/block strike sensor of mechanical compressor, to feed collected angle information to the electric cam controller; the controller based on the crank angle information outputs cam signal, based on the passed angle in fixed time of crank to calculate out the crank speed. The invention is characterized in that: based on the brake angles of last two sliding blocks, it finds the incline factor of angle-speed curvature; when the compressor first operates in one sliding block speed, based on said factor, it can find the present brake angle; when the speed is stable, the brake angle will be automatically compensated referring to the shift from last brake angle; the brake angles in different speeds are stored; when the electric cam receives brake signal, based on preset speed to inquire database, and find out present brake angle; when block reaches said brake angle, outputting the brake signal.

The invention provides a method for controlling rigidity of a mill housing, which comprises the steps of: initializing a mill roll gap regulating variable, setting a rolling force, and adopting a mechanical pressing roll gap control so that after the roll gap reaches the set position, the roll gap position set by the mechanism pressing keeps unchanged; starting thickness automatic control function, locking the momentary rigidity as reference rigidity, providing real rigidity, set rolling force, mill stand rigidity coefficient, rolled piece plasticity coefficient and roll gap set value by an upper computer; calculating the roll gap regulating variable by a formula; and regulating the roll gap by a hydraulic pressing system according to the roll gap regulating variable delta S' obtained from the calculation to a satisfactory degree and ending the regulation of the position of a mill. The invention realizes the purpose of improving the thickness control precision of rolling a wide and thick plate under the condition that the rigidity of the mill housing changes and can be popularized and applied to the improvement of various pressure AGC models for steel rolling, thereby having better popularization and application prospect.