High-performance component twisting-extruding forming device
Technical Field
The invention relates to the technical field of metal plastic processing, in particular to a twisting-extruding forming device for a high-performance component.
Background
With the rapid development of aerospace industry in China, high requirements on the performance of parts are provided, and the development of an advanced forming method of a high-performance member is urgently needed to meet the urgent requirements on overall weight reduction and high performance, however, the traditional process method (casting, extruding and rolling) for forming the member has certain limitations, the member has the problems of internal defects, relatively low performance, uneven deformation and the like, and the requirements on the aerospace high-performance member are difficult to meet, so that the problem that the high-performance member is urgently needed to be solved by exploring a new metal forming method is solved.
Compared with other strengthening methods, the fine grain strengthening can not only improve the performance but also improve the plasticity, and is a main method for strengthening and toughening the metal. High-pressure twisting has a remarkable effect on grain refinement, and can refine grains to submicron or nanometer levels, but has a certain limitation on a formed member. Extrusion processes have a significant effect on forming and the properties of the formable parts are relatively low. The invention combines the advantages of the two and provides the high-performance component twisting-extruding forming device which can ensure the forming in the forming process. The new method is expected to break through the traditional forming method of the component and can ensure that the component has good interface quality and shape precision, thereby meeting the requirements of integral forming and weight reduction of the component. Therefore, the process device system for the twisting-extruding composite forming is of great significance for realizing the plastic processing of high-performance components.
Disclosure of Invention
The invention provides a twisting-extruding forming device for a high-performance component, aiming at the problem that a high-performance plate is difficult to process by a traditional forming method and based on the high-pressure twisting outstanding fine-grain capability and the extruding forming capability.
The apparatus includes an extrusion forming portion, a torsional shear portion, a control portion, and a detection portion. The extrusion forming part comprises a male die, an extrusion cylinder, a die, an upper die holder, a base plate, a baffle plate and a lower die holder, and is connected with the torsional shearing part through an inner hexagonal bolt; the torsion shearing part comprises a torsion shaft, a main shaft, a thrust self-aligning roller bearing, a bearing box upper cover plate, a bearing box lower cover plate, a bearing box support plate, a reducer fixing plate, a worm and gear reducer, a servo motor and a bottom plate, wherein the servo motor is connected with the input end of the worm and gear reducer through a flange; the control part comprises a servo driver and a speed controller; the detection part comprises a torque sensor, a pressure sensor, a displacement sensor, a multi-channel signal collector and a computer. The displacement sensor is arranged on the upper die base, the pressure sensor is arranged between the upper die base and the base plate, the displacement sensor and the pressure sensor are respectively connected with the multi-channel signal collector, the baffle plate is arranged below the base plate, the male die is fixed below the baffle plate and extends into the extruding cylinder, the die is arranged at the lower part of the extruding cylinder, the component is arranged in the extruding cylinder, the die is arranged on the lower die base, the lower die base is arranged on the upper cover plate of the bearing box, the component is arranged on the torsion shaft, the outer side of the main shaft is provided with the thrust self-aligning roller bearing which is sealed in the bearing box, the lower part of the main shaft is provided with a coupler which is connected with the torque sensor, the worm gear reducer is arranged on the bottom plate at the lower part of the device, the lower part of the torque, the servo driver is connected with the power supply and the speed controller, and the speed controller and the multi-channel signal collector are connected with the computer.
The lower die base is provided with a through hole for the main shaft to pass through, and the die is provided with a through hole for the torsion shaft to contact with the component.
One end of the main shaft penetrates through a center hole of the lower cover plate of the bearing box to be connected with the coupler, the other end of the main shaft is matched with the torsion shaft through a spline, the main shaft is matched with the two self-aligning thrust roller bearings, one of the two self-aligning thrust roller bearings is matched with the bearing box, and the other self-aligning thrust roller bearing is matched with the upper cover plate of the bearing box.
One end of the torque sensor is connected with the coupler, the other end of the torque sensor is connected with the worm gear reducer, the torque sensor is externally connected with a multi-channel signal collector, the multi-channel signal collector is connected with a power supply, a communication interface on the multi-channel signal collector is connected with a computer, and the torque, the power and the rotating speed of each moment can be recorded during working.
The servo motor is externally connected with a servo driver, the servo driver controls the start and stop of the servo motor, the servo driver is connected with a power line, a servo motor connecting line and a speed controller connecting line, and the speed controller is used for adjusting the rotating speed of the servo motor so as to meet the reasonable matching of the extrusion speed and the torsion speed when different components are formed.
One end of the support plate of the speed reducer is connected with the bottom plate, the other end of the support plate of the speed reducer is connected with the lower cover plate of the bearing box to play a supporting role, one end of the support plate of the bearing box is connected with the upper cover plate of the bearing box, and the other end of the support plate of the bearing box is connected with the lower cover plate of the bearing box to play a supporting.
The output end of the worm gear reducer, the main shaft, the torsion shaft, the central hole of the lower cover plate of the bearing box, the central hole of the upper cover plate of the bearing box, the central hole of the lower die holder and the central hole of the die are coaxial.
The end of the torsion shaft is provided with 4 spiral grooves, the cross sections of the spiral grooves are inverted isosceles trapezoids, and the isosceles angle is 60 degrees.
The device comprises the following steps:
s1: fixing the torsion shearing part on a workbench through a bolt;
s2: fixing an extrusion cylinder and a die in the extrusion forming part on a lower die base through bolts;
s3: fixing a lower die holder in the extrusion forming part on an upper cover plate of a bearing box in the twisting device through bolts;
s4: fixing the male die, the base plate and the baffle on an upper die base;
s5: fixing the upper die base on a press slide block through a bolt;
s6: heating the blank to a temperature above the recrystallization temperature and maintaining the temperature while heating the mold apparatus to the same temperature;
s7: coating molybdenum disulfide lubricant on the blank, the male die, the extrusion container, the die and the torsion shaft;
s8: placing a blank in the extrusion container cavity, wherein the bottom end of the blank is contacted with the torsion shaft;
s9: starting a servo motor, and regulating and controlling the output rotating speed of the servo motor through a speed controller to enable a torsion shaft to obtain the rotating speed;
s10: and starting the press, enabling the male die to move downwards at a set extrusion speed, enabling the blank to be subjected to the combined action of extrusion and torsional deformation, finally realizing the near-net forming of the high-performance component in a single pass, acquiring signals through a torque sensor in the working process, and recording the change of torque, power and rotating speed at each moment by a computer.
Taking a typical plate member as an example, the blank bears the combined action of extrusion forming and torsional deformation in the process of forming the plate member, and the high-performance near-net forming of the typical plate member in a single pass is realized.
The blank is in a composite stress state of extrusion and high-pressure torsion when forming plate members, the torsion enables the bottom of the blank to be subjected to strong shearing action to generate obvious grain refining effect, and friction heat can be generated to generate local temperature rise, so that the plastic full flow is promoted, and the extrusion force of composite forming is reduced.
The rotating speed of the torsion shaft can realize stepless speed change, and the torsion shaft is in small clearance fit with the central hole of the die, so that the rotation of the torsion shaft can be ensured, and flash can be prevented.
The technical scheme of the invention has the following beneficial effects:
(1) the extrusion force required by forming is reduced, and the strong shearing action causes temperature rise to promote plastic flow of the metal, so that the extrusion force required by forming is reduced.
(2) The fine grain effect is outstanding, under the combined action of extrusion and torsion, the grains in the blank are subjected to mechanical crushing and dynamic recrystallization under the action of strong shearing, so that the grains are refined.
(3) The forming of the plate type components with different length-width ratios can be realized, and the processing of the plate type components with different length-width ratios can be adapted by replacing the torsion shafts with different specifications.
(4) The rotating speed of the torsion shaft can realize stepless speed change, the torsion shearing device is powered by the servo motor, and the output rotating speed of the torsion shearing device is changed by changing the output rotating speed of the servo motor.
(5) Can be widely applied to the forming and manufacturing of light metal plate members such as magnesium alloy, aluminum alloy and the like.
Drawings
FIG. 1 is a schematic view showing a twist-and-squeeze forming process of a high-performance member in example 1 of the present invention;
FIG. 2 is a view different from the extrusion molding section in example 1, wherein (a) is a molding cylinder and (b) is a molding disk;
FIG. 3 is a schematic view of a twist shear portion in example 1 of the present invention;
fig. 4 is a schematic structural view of a torsion shaft in embodiment 1 of the present invention, in which (a) an end face of the torsion shaft is flat and provided with a spiral groove, (b) an end face of the torsion shaft is a circular truncated cone and provided with a spiral groove, and (c) an end face of the torsion shaft is flat and provided with a convex boss;
fig. 5 is a schematic structural view of the magnesium alloy plate member at the end of the twist-and-squeeze forming in example 1.
Wherein: 1-an upper die holder, 2-a displacement sensor, 3-a baffle, 4-an extrusion cylinder, 5-a die, 6-a main shaft, 7-a bearing box upper cover plate, 8-a bearing box support plate, 9-a bearing box lower cover plate, 10-a coupler, 11-a torque sensor, 12-a reducer support plate, 13-a servo motor, 14-a bottom plate, 15-a reducer fixing plate, 16-a worm and gear reducer, 17-a bearing box, 18-a thrust self-aligning roller bearing, 19-a lower die holder, 20-a torsion shaft, 21-a component, 22-a male die, 23-a base plate and 24-a pressure sensor.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a device for twisting-extruding and forming a high-performance component.
As shown in fig. 1, the apparatus includes an extrusion forming portion, a torsional shearing portion, a control portion, and a detection portion. The extrusion forming part comprises a male die 22, an extrusion cylinder 4, a die 5, an upper die holder 1, a backing plate 23, a baffle 3 and a lower die holder 19, and is connected with the torsional shearing part through an inner hexagonal bolt; the torsion shearing part comprises a torsion shaft 20, a main shaft 6, a thrust self-aligning roller bearing 18, a bearing box 17, a bearing box upper cover plate 7, a bearing box lower cover plate 9, a bearing box support plate 8, a reducer support plate 12, a reducer fixing plate 15, a worm gear reducer 16, a servo motor 13 and a base plate 14, wherein the servo motor 13 is connected with the input end of the worm gear reducer 16 through a flange, the worm gear reducer 16 is fixed on the reducer fixing plate 15 through bolts, the reducer fixing plate 15 is fixed between the base plate 14 and the bearing box lower cover plate 9 through bolts, the bearing box 17 is fixed on the bearing box lower cover plate 9, the bearing box upper cover plate 7 is fixed on the bearing box 17, and the bearing box upper cover plate 7 is connected with a lower die holder 19 through; the control part comprises a servo driver and a speed controller; the detection part comprises a torque sensor 11, a pressure sensor 24, a displacement sensor 2, a multi-channel signal collector and a computer. A displacement sensor 2 is arranged on an upper die holder 1, a pressure sensor 24 is arranged between the upper die holder 1 and a backing plate 23, the displacement sensor 2 and the pressure sensor 24 are respectively connected with a multi-channel signal collector, a baffle plate 3 is arranged below the backing plate 23, a male die 22 is fixed below the baffle plate 3, the male die 22 extends into an extrusion barrel 4, a die 5 is arranged at the lower part of the extrusion barrel 4, a member 21 (blank before forming) is arranged in the extrusion barrel 4, the die 5 is arranged on a lower die holder 19, the lower die holder 19 is arranged on an upper cover plate 7 of a bearing box, the member 21 (blank before forming) is arranged on a torsion shaft 20, a self-aligning thrust roller bearing 18 is arranged at the outer side of a main shaft 6, the self-aligning thrust roller bearing 18 is sealed in the bearing box 17, a coupler is arranged at the lower part of the main shaft 6 and connected with a torque sensor, the worm gear reducer 16 is driven by a servo motor 13, a reducer supporting plate 12 is arranged between a lower cover plate 9 and a bottom plate 14 of the bearing box, the servo motor 13 is connected with a servo driver, the servo driver is connected with a power supply and a speed controller, and the speed controller and the multi-channel signal collector are connected with a computer.
At this time, the member 21 is a blank at the beginning of molding.
At the end of the forming, the member 21 is a plate, as shown in figure 5.
The following description is given with reference to specific examples.
As shown in fig. 1, the extrusion billet is cylindrical, and the device is used by the following steps:
s1: a main shaft 6, a bearing box upper cover plate 7, a bearing box support plate 8, a bearing box lower cover plate 9, a reducer support plate 12, a servo motor 13, a bottom plate 14, a reducer fixing plate 15, a worm and gear reducer 16, a bearing box 17, a self-aligning thrust roller bearing 18 and a torsion shaft 20 are combined into a torsion shearing device shown in figure 3;
s2: fixing the torsion shearing device on a workbench of a press machine, and fixing the bottom plate 14 on the workbench by using bolts;
s3: the die 5 and the extrusion cylinder 4 are combined together and fixed on the lower die base 19 through bolts;
s4: fixing the lower die holder 19 on the upper cover plate 7 of the bearing box in the torsion shearing device through bolts;
s5: fixing the male die 22, the backing plate 23 and the baffle 3 on the upper die holder 1 through bolts;
s6: fixing the upper die holder 1 on a press slide block through a bolt;
s7: heating the component 21 (now a blank) to above the recrystallization temperature and holding for a period of time while heating the die assembly to the same temperature;
s8: coating the blank, the male die 22, the extrusion container 4, the die 5 and the torsion shaft 20 with molybdenum disulfide lubricant;
s9: placing the blank in a die cavity of an extrusion container, wherein the bottom end of the blank is in contact with a torsion shaft 20;
s10: starting the servo motor 13, regulating and controlling the output rotating speed of the servo motor through a servo driver and a speed controller, and obtaining a certain rotating speed by the torsion shaft 20;
s11: and starting the press, enabling the male die 22 to move downwards at a certain extrusion speed, subjecting the blank to the combined action of extrusion and torsional deformation, finally realizing the high-performance near-net forming of the plate type component in a single pass, and recording the change of torque, rotating speed and power in the forming process by the computer.
In practice, the member may also be shaped as shown in FIG. 2. The torsion shaft can be correspondingly adjusted based on the change of the die, so that the forming of different high-performance components is realized, as shown in fig. 4, the end faces of three torsion shafts are provided, the number of spiral grooves can be increased or decreased for the torsion shaft shown in fig. (a) according to the forming requirement, a circular table with the height h exists in fig. (b) relative to fig. (a), the height of the circular table is adjustable, the number of spiral grooves is adjustable, and as shown in fig. (c), bosses protruding on the end faces can be increased or decreased according to the requirement.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.