Double-head torsion bar press machine and working method thereof

Abstract

The present invention provides a double-head torsion bar press machine and a working method thereof. The torsion bar press machine comprises a base, a support frame, a press oiling device and a torsion bar press device. The torsion bar press device comprises an electric cylinder press mechanism and a lower platen. The torsion bar press device also comprises a press assembly, a lower shaft mechanism, a positioning assembly, a torsion bar straightening mechanism and a feeding mechanism. The lower shaft mechanism comprises a servo motor, an angle encoder and a torque sensor. An upper power-assist shaft is arranged on the torque sensor. A flat position is arranged on the upper power-assist shaft. The phase angle of the flat position is the same as the phase angle of the limit block. The working method of the torsion bar press machine comprises steps S1 to S9. The double-head torsion bar press machine can perform real-time monitoring of pressure-displacement during the press process, and can also perform mechanical centering on the press assembly, thereby improving the press accuracy and ensuring the production quality of the steering gear.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical equipment, and in particular to a double-head torsion bar press and a working method thereof. Background Art

[0002] The steering gear is one of the important parts in the automobile production process. When the driver turns the steering wheel, the steering gear can change the direction of the car. The torsion bar is one of the important components of the steering gear. The usual practice is to press the torsion bar into the power shaft, and then assemble the assembly formed by the torsion bar and the power shaft to form a steering gear. In the existing torsion bar press-fitting equipment, the equipment has a press-fitting function, but it is impossible to detect the real-time condition of the pressure during the press-fitting process. The utility model patent with publication number CN205888515U discloses a torsion bar press-fitting machine, which uses a pressure sensor and a grating ruler to realize real-time monitoring of pressure-displacement. However, the torsion bar press-fitting machine lacks the function of mechanically adjusting the components after press-fitting, which will cause the steering angle of the car to be unequal when the steering gear produced is turned to the left and right by the same angle. Summary of the invention

[0003] A first object of the present invention is to provide a double-head torsion bar press machine capable of improving the mechanical centering of the torsion bar.

[0004] The second object of the present invention is to provide a working method of the above-mentioned double-head torsion bar press.

[0005] In order to achieve the above-mentioned first purpose, the double-head torsion bar pressing machine provided by the present invention includes a base, a support frame, a pressing oiling device and a torsion bar pressing device, the support frame is fixed above the base, and the pressing oiling device and the torsion bar pressing device are arranged in the support frame, the torsion bar pressing device includes an electric cylinder pressing mechanism and a lower platen, the lower platen is located below the electric cylinder pressing mechanism, the torsion bar pressing device also includes a pressing assembly, a lower shaft mechanism, a positioning assembly, a torsion bar straightening mechanism and a feeding mechanism, the electric cylinder pressing mechanism can drive the pressing assembly to move up and down, the pressing oiling device, the feeding mechanism, the torsion bar straightening mechanism and the positioning assembly are all arranged on the upper surface of the lower platen, and a passage is opened on the lower platen. The top end of the lower shaft mechanism extends out from the through hole, a lower power-assist shaft turbine assembly is arranged on the press-fit assembly, a limit hole is opened on the lower power-assist shaft turbine assembly, a mounting plate is arranged on the feeding mechanism, a supporting block is arranged on the mounting plate, a limit block is arranged on the upper surface of the supporting block, and the shapes of the limit hole and the limit block match; the lower shaft mechanism includes a servo motor, an angle encoder and a torque sensor, a transmission belt is arranged at the output end of the servo motor, a connecting shaft is arranged on the transmission belt, the connecting shaft connects the angle encoder and the torque sensor, an upper power-assist shaft is arranged on the torque sensor, a flat position is arranged on the upper power-assist shaft, and the phase angle of the flat position is the same as the phase angle of the limit block.

[0006] It can be seen from the above scheme that during the process of pressing the torsion bar, the electric cylinder pushes the press-fitting assembly downward for press-fitting. The phase angles of the flat position and the limit block are the same, and the limit block extends into the limit hole of the lower power-assist shaft worm assembly. When the lower power-assist shaft turbine assembly is transferred to the press-fitting assembly, the phase angle of the limit hole and the phase angle of the flat position are also the same. Therefore, during the downward press-fitting process, the lower power-assist shaft turbine assembly can be directly pressed onto the upper power-assist shaft without manual positioning. When mechanical centering is required, a torque value is first preset and recorded as the preset value. The flat position of the upper power-assist shaft is inserted into the limit hole, and the servo motor is started. The servo motor drives the upper power-assist shaft to rotate. The torque reading is observed through the torque sensor. When the torque reading reaches the preset value, it means that the flat position has rotated to the limit position on one side at this time, and the rotation angle value at this time is recorded. Then the servo motor is reversed. When the torque reaches the preset value again, it means that the flat position has rotated to the limit position on the other side at this time. The rotation angle value at this time is recorded, and then the middle position of the two deflection angle values ​​is taken as the mechanical centering position.

[0007] Preferably, the electric cylinder pressing mechanism includes an electric cylinder and an upper platen. The electric cylinder can drive the upper platen to move up and down. A pressure sensor is arranged on the electric cylinder, and a displacement sensor is arranged on the upper platen. The electric cylinder pressing mechanism also includes a support column, which is arranged on the lower surface of the upper platen, and a column is arranged between the upper platen and the lower platen.

[0008] In the above scheme, the pressure sensor can detect the size of the electric cylinder pressure at any time, and the displacement sensor can detect the downward displacement of the electric cylinder at any time. The size of the electric cylinder pressure and the displacement value can be displayed in real time on the CNC display screen. The inspection personnel can monitor the pressure-displacement of the torsion bar press in real time through the CNC display screen.

[0009] A further solution is that the pressing and oiling device includes a support seat, a pressing cylinder, an oiling cylinder, a mounting plate, and a transfer cylinder. The pressing cylinder and the oiling cylinder are located at the top of the support seat, the mounting plate and the transfer cylinder are located at the bottom of the support seat, and the transfer cylinder can push the mounting plate to move.

[0010] In the above scheme, the turbine is placed on the mounting plate, and then the press cylinder moves down to press the sliding bearing into the turbine to form the lower booster shaft turbine assembly. After the press assembly is completed, the transfer cylinder moves the workpiece to the bottom of the oiling cylinder, and the press cylinder moves up at the same time. The oiling cylinder moves down, and an oiling device is provided at one end of the oiling cylinder. The oiling device oils the surface of the workpiece. After completion, the oiling cylinder moves up, and the transfer cylinder pushes the workpiece out.

[0011] A further solution is that a first clamping assembly is arranged inside the press-fit assembly, and the first clamping assembly clamps the lower booster shaft turbine assembly.

[0012] A further solution is that the lower shaft mechanism also includes a second clamping assembly, a chuck and a chuck seat, the chuck seat is located on the top of the torque sensor, the chuck is set on the chuck seat, the second clamping assembly is set on the chuck, the upper power-assist shaft is set on the chuck, and the second clamping assembly clamps the upper power-assist shaft.

[0013] A further solution is that the feeding mechanism also includes a rising cylinder, an extending cylinder and a third clamping assembly. The rising cylinder is located at the bottom of the feeding mechanism, the output end of the rising cylinder is connected to the bottom of the extending cylinder, the output end of the extending cylinder is connected to the third clamping assembly, and the third clamping assembly includes a first clamping jaw, and the first clamping jaw is arranged on the mounting plate.

[0014] In the above scheme, the third clamping assembly clamps the lower booster shaft turbine assembly, and then the cylinder is extended to push the third clamping assembly forward, and then the lifting cylinder lifts the third clamping assembly upward to lift the lower booster shaft turbine assembly to the press-fit assembly, and then the first clamping assembly clamps the lower booster shaft turbine assembly, and then the feeding mechanism is reset. Through the above steps, the feeding mechanism transfers the lower booster shaft turbine assembly to the press-fit assembly.

[0015] A further solution is that the positioning assembly includes a first mounting seat and a laser micrometer, the first mounting seat is arranged on the upper surface of the lower platen, the laser micrometer is arranged on the first mounting seat, and the laser micrometer is used to detect the phase angle of the flat position.

[0016] In the above scheme, the laser micrometer can automatically sense the phase angle of the limit block through the laser, and then rotate the upper power-assist shaft torsion bar assembly to the same phase angle through the servo motor, so that when the lower power-assist shaft turbine assembly is pressed onto the upper power-assist shaft torsion bar assembly, the flat part can be inserted into the limit hole to complete the torsion bar press-fitting. The manual positioning process is eliminated, and the press-fitting efficiency is improved.

[0017] A further solution is that the torsion bar straightening mechanism includes a second mounting seat, a sliding cylinder and a fourth clamping assembly, the second mounting seat is arranged on the upper surface of the lower platen, the sliding cylinder is arranged on the second mounting seat, and the fourth clamping assembly is arranged at one end of the sliding cylinder.

[0018] In the above scheme, the fourth clamping assembly includes a second clamping jaw. After the torsion bar is pressed into the upper power-assisting shaft, during the process of the press-fitting assembly pressing the lower power-assisting shaft turbine assembly downward, the sliding cylinder moves forward to push the second clamping jaw to a predetermined position, and then the second clamping jaw clamps the torsion bar. During the entire press-fitting process, the second clamping jaw always clamps the torsion bar to prevent the torsion bar from shifting or breaking during the press-fitting process, thereby improving the press-fitting accuracy.

[0019] In order to achieve the above-mentioned second purpose, the working method of the double-head torsion bar press-fitting machine provided by the present invention applies the above-mentioned double-head torsion bar press-fitting machine, and the working method comprises the following steps:

[0020] Step S1: using a press-fit oiling device to press-fit the turbine and the lower booster shaft to form a lower booster shaft turbine assembly;

[0021] Step S2: placing the upper power-assisting shaft on the lower shaft mechanism, and the lower shaft mechanism clamps the upper power-assisting shaft;

[0022] Step S3: placing the torsion bar on a torsion bar press-fitting device, and the torsion bar press-fitting device presses the torsion bar into the upper power-assist shaft to form an upper power-assist shaft torsion bar assembly;

[0023] Step S4: placing the lower booster shaft turbine assembly on the loading mechanism;

[0024] Step S5: the feeding mechanism conveys the lower booster shaft turbine assembly to the torsion bar press-fitting device, the torsion bar press-fitting device clamps the lower booster shaft turbine assembly, and the feeding mechanism is reset;

[0025] Step S6: the positioning assembly adjusts the angle of the upper power-assisting shaft assembly;

[0026] Step S7: pre-tightening the lower power-assist shaft turbine assembly onto the upper power-assist shaft torsion bar assembly by a press-fit assembly;

[0027] Step S8: The lower shaft mechanism performs mechanical centering on the upper power-assisting shaft assembly;

[0028] Step S9: The press-fit assembly presses the lower power-assist shaft turbine assembly onto the upper power-assist shaft torsion bar assembly to form a power-assist shaft torsion bar assembly.

[0029] It can be seen from the above scheme that the above working method can complete the press-fitting of the power-assist shaft torsion bar assembly, and mechanical centering can be achieved during the torsion bar press-fitting process, and real-time monitoring of pressure-displacement can be achieved during the press-fitting process.

[0030] Preferably, the above step S8 includes the following steps:

[0031] Step S81: presetting a torque value, and recording the torque value as a preset value;

[0032] Step S82: starting the servo motor, the servo motor drives the upper power-assisting shaft to rotate, observing the torque sensor reading, when the torque sensor reading reaches a preset value, recording the angle encoder reading at this time, and recording the angle encoder reading as the first angle value;

[0033] Step S83: Reverse the servo motor, so that the servo motor drives the upper power-assisting shaft to reverse, and observe the torque sensor reading. When the torque sensor reading reaches the preset value again, record the angle encoder reading at this time as the second angle value;

[0034] Step S84: Take the middle position between the first angle value and the second angle value, where the middle position is the centering position. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural diagram of a double-head torsion bar press assembly machine embodiment of the present invention, shown along a first viewing angle.

[0036] Figure 2 This is a structural diagram of the double-head torsion bar press assembly machine embodiment of the present invention as shown from the second viewing angle.

[0037] Figure 3 It is a structural diagram of an embodiment of a double-head torsion bar press assembly machine of the present invention with some components hidden.

[0038] Figure 4 It is a structural diagram of the press-fitting oiling device of the double-head torsion bar press-fitting machine embodiment of the present invention.

[0039] Figure 5 It is a structural diagram of the press-fitting assembly of the double-head torsion bar press-fitting machine embodiment of the present invention.

[0040] Figure 6 It is a structural diagram of the booster shaft turbine assembly of the double-head torsion bar press embodiment of the present invention.

[0041] Figure 7 It is an exploded view of the lower shaft mechanism of the double-head torsion bar press embodiment of the present invention.

[0042] Figure 8 It is a structural diagram of the feeding mechanism of the double-head torsion bar press assembly machine embodiment of the present invention.

[0043] Fig. 9 It is a structural diagram of the support block of the double-head torsion bar press embodiment of the present invention.

[0044] Fig.10 It is a structural diagram of the positioning assembly of the double-head torsion bar press assembly embodiment of the present invention.

[0045] Fig.11 It is a structural diagram of the torsion bar straightening mechanism of the double-head torsion bar press assembly machine embodiment of the present invention.

[0046] Fig.12 The present invention is a flowchart of the working method of the double-head torsion bar press machine.

[0047] Fig.13 yes Fig.12 Flow chart of step S8 in FIG.

[0048] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0049] See also Figures 1 to 3 , Figure 3The structural diagram of the double-headed torsion bar press is shown in which the base 1 and the support frame 2 are hidden. The double-headed torsion bar press provided in this embodiment includes a base 1, a support frame 2, a press-fitting oiling device 3 and a torsion bar press-fitting device. A running wheel 4 is provided under the base 1, and the running wheel 4 can drive the entire device to move forward. The support frame 2 is fixed above the base 1, and a numerical control display screen 5 is provided on the right side of the support frame 2, and a hanger 6 is provided on the left side of the support frame 2. The equipment operation instruction manual is installed in the hanger 6. The press-fitting oiling device 3 and the torsion bar press-fitting device are provided in the support frame 2, and the torsion bar press-fitting device includes an electric cylinder press-fitting mechanism 7 and a lower platen 8, and the lower platen 8 is located below the electric cylinder press-fitting mechanism 7. The torsion bar press-fitting device also includes a press-fitting assembly 9, a lower shaft mechanism 10, a positioning assembly 11, a torsion bar straightening mechanism 12 and a feeding mechanism 13. The electric cylinder press-fitting mechanism 7 can drive the press-fitting assembly 9 to move up and down. The press-fitting oiling device 3, the feeding mechanism 13, the torsion bar straightening mechanism 13 and the positioning assembly 11 are all arranged on the upper surface of the lower platen 8. A through hole (not shown in the figure) is opened on the lower platen 8, and the top of the lower shaft mechanism 10 extends out from the through hole. The electric cylinder press-fitting mechanism 7 includes an electric cylinder 71, an upper platen 72, and a support column 73. The support column 73 is arranged on the lower surface of the upper platen 72. The electric cylinder 71 can drive the upper platen 72 to move up and down. A plurality of columns 74 are arranged between the upper platen 72 and the lower platen 8. A pressure sensor (not shown in the figure) is arranged on the electric cylinder 71, and a displacement sensor 75 is arranged on the upper platen 72.

[0050] In this embodiment, during the process of pressing the torsion bar, the electric cylinder 71 pushes the press assembly 9 downward for pressing. The pressure sensor can detect the pressure of the electric cylinder 71 at any time, and the displacement sensor 75 can detect the displacement of the electric cylinder 71 moving downward at any time. The pressure and displacement of the electric cylinder 71 can be displayed in real time on the numerical control display screen 5. The inspection personnel can monitor the pressure-displacement of the torsion bar press machine in real time through the numerical control display screen 5.

[0051] See also Figure 4 The pressing and oiling device 3 includes a support seat 31, a pressing cylinder 32, an oiling cylinder 33, a mounting plate 34, and a transfer cylinder 35. The pressing cylinder 32 and the oiling cylinder 33 are located at the top of the support seat 31, the mounting plate 34 and the transfer cylinder 35 are located at the bottom of the support seat 31, and the transfer cylinder 35 can push the mounting plate 34 to move. The shape of the support seat 31 is C-shaped.

[0052] In this embodiment, the turbine is placed on the mounting plate 34, and then the press cylinder 32 is moved downward to press the sliding bearing 36 into the turbine 37 to form the lower booster shaft turbine assembly. After the press assembly is completed, the transfer cylinder 35 moves the workpiece to the bottom of the oiling cylinder 33, and the press cylinder 32 is moved upward at the same time. The oiling cylinder 33 moves downward, and an oiling device is provided at one end of the oiling cylinder 33. The oiling device oils the surface of the lower booster shaft turbine assembly. After completion, the oiling cylinder 33 moves upward, and the transfer cylinder 35 pushes the lower booster shaft turbine assembly out. The operator takes out the lower booster shaft turbine assembly, places it on the loading mechanism 13, and starts the next step.

[0053] See also Figure 5 and Figure 6 The press-fit assembly 9 includes a support tube 91 and a first clamping assembly 92, and the first clamping assembly 92 is arranged inside the support tube 91. The first clamping assembly 92 clamps a lower booster shaft turbine assembly 93. A limiting hole 94 is provided on the lower booster shaft turbine assembly 93.

[0054] See also Figure 7 The lower shaft mechanism 10 includes a servo motor 111, a second clamping assembly 112, a chuck 113, a chuck seat 114, an angle encoder 115 and a torque sensor 116. A transmission belt 117 is provided at the output end of the servo motor 111, and a connecting shaft 118 is provided on the transmission belt 117. The connecting shaft 118 connects the angle encoder 115 and the torque sensor 116. A protective cover 119 is provided at the bottom of the lower shaft mechanism 10, and the transmission belt 117 and the angle encoder 115 are provided inside the protective cover 119. The chuck seat 114 is located at the top of the torque sensor 116, the chuck 113 is provided on the chuck seat 114, the second clamping assembly 112 is provided on the chuck 113, an upper power-assisting shaft 120 is provided on the chuck 113, and a flat position 121 is provided on the upper power-assisting shaft 120, and the upper end of the flat position 121 extends into the limiting hole 94.

[0055] In this embodiment, the upper power-assisting shaft 120 is arranged on the chuck 113. When mechanical centering is required, a torque value is first preset, and the torque value is recorded as the preset value. The flat part 121 of the upper power-assisting shaft 120 is inserted into the inside of the limit hole 94, and the servo motor 111 is started. The servo motor 111 drives the upper power-assisting shaft 120 to rotate, and the torque reading is observed through the torque sensor 116. When the reading reaches the preset value, it means that the flat part 120 has rotated to the limit position on one side at this time, and the angle value of rotation at this time is recorded. Then the servo motor 111 is reversed. When the torque reaches the preset value again, it means that the flat part 120 has rotated to the limit position on the other side at this time, and the angle value of rotation at this time is recorded. Then the middle position of the two deflection angle values ​​is taken as the mechanical centering position. It should be noted that mechanical centering is a necessary step in the torsion bar press-fitting process. If mechanical centering is not performed during the torsion bar press-fitting process, and the power-assisting shaft torsion bar assembly is directly assembled into the steering gear, it is likely to cause the problem of inconsistent left and right rotation angles of the steering gear. When applied in practice, the problem arises that the driver swings the steering wheel to the left and right by the same amplitude, but the car turns at different angles.

[0056] See also Figure 8 and Fig. 9 The feeding mechanism 13 includes a lifting cylinder 141, an extending cylinder 142 and a third clamping assembly. The lifting cylinder 141 is located at the bottom of the feeding mechanism 13. The output end of the lifting cylinder 141 is connected to the bottom of the extending cylinder 142. The output end of the extending cylinder 142 is connected to the third clamping assembly. The third clamping assembly includes a first clamping jaw 143 and a mounting plate 144. The first clamping jaw 143 is arranged on the mounting plate 144. A support block 145 is arranged on the mounting plate 144. A limit block 146 is arranged on the upper surface of the support block 145. The shape of the limit block 146 matches that of the limit hole 94.

[0057] In this embodiment, the first clamping jaw 143 clamps the lower booster shaft turbine assembly 93, and then the cylinder 142 is extended to push the third clamping assembly forward, and then the lifting cylinder 141 lifts the third clamping assembly upward, and lifts the lower booster shaft turbine assembly 93 to the press-fit assembly 9, and then the first clamping assembly 102 clamps the lower booster shaft turbine assembly 93, and then the feeding mechanism 13 is reset. Through the above steps, the feeding mechanism 13 transfers the lower booster shaft turbine assembly 93 to the press-fit assembly 9.

[0058] See also Fig.10 The positioning assembly 11 includes a first mounting seat 122 and a laser micrometer 123. The first mounting seat 122 is arranged on the upper surface of the lower plate 8. The laser micrometer 123 is arranged on the first mounting seat 122. The laser micrometer 123 is used to detect the phase angle of the flat position 121.

[0059] In this embodiment, the laser micrometer 123 can automatically sense the phase angle of the limit block 146 through the laser, and then rotate the upper power-assist shaft torsion bar assembly to the same phase angle through the servo motor 111. In this way, when the lower power-assist shaft turbine assembly 93 is pressed onto the upper power-assist shaft torsion bar assembly, the flat part 121 can be inserted into the limit hole 94 to complete the torsion bar press-fitting.

[0060] See also Fig.11 The torsion bar straightening mechanism 12 includes a second mounting seat 131, a sliding cylinder 132 and a fourth clamping assembly 133. The second mounting seat 131 is arranged on the upper surface of the lower plate 8, the sliding cylinder 132 is arranged on the second mounting seat 131, and the fourth clamping assembly 133 is arranged at one end of the sliding cylinder 132.

[0061] In this embodiment, the fourth clamping assembly 133 includes a second clamping jaw 134. After the torsion bar is pressed into the upper power-assisting shaft 120, during the process of the press-fitting assembly 9 pressing the lower power-assisting shaft turbine assembly 93 downward, the sliding cylinder 132 advances forward to push the second clamping jaw 134 to a predetermined position, and then the second clamping jaw 134 clamps the torsion bar. During the entire press-fitting process, the second clamping jaw 134 always clamps the torsion bar to prevent the torsion bar from shifting or breaking during the press-fitting process, thereby improving the press-fitting accuracy.

[0062] See also Fig.12 The working method of the double-head torsion bar press machine provided in this embodiment includes the following steps: first, execute step S1, use the press-fit oiling device to press-fit the turbine and the lower booster shaft to form a lower booster shaft turbine assembly; then, execute step S2, place the upper booster shaft on the lower shaft mechanism, and the lower shaft mechanism clamps the upper booster shaft; then, execute step S3, place the torsion bar on the torsion bar press-fit device, and the torsion bar press-fit device presses the torsion bar into the upper booster shaft to form an upper booster shaft torsion bar assembly; then, execute step S4, place the lower booster shaft turbine assembly on the feeding mechanism; then, execute step S5 , the feeding mechanism conveys the lower power-assist shaft turbine assembly to the torsion bar pressing device, the torsion bar pressing device clamps the lower power-assist shaft turbine assembly, and the feeding mechanism resets; then, execute step S6, the positioning assembly adjusts the angle of the upper power-assist shaft assembly; then, execute step S7, the pressing assembly pre-presses the lower power-assist shaft turbine assembly onto the upper power-assist shaft torsion bar assembly; then, execute step S8, the lower shaft mechanism mechanically adjusts the upper power-assist shaft assembly; finally, execute step S9, the pressing assembly presses the lower power-assist shaft turbine assembly onto the upper power-assist shaft torsion bar assembly to form a power-assist shaft torsion bar assembly.

[0063] During the execution of step S2, the second clamping assembly 112 clamps the upper power-assist shaft. During the execution of step S3, the press-fit assembly 9 presses the torsion bar into the upper power-assist shaft to form an upper power-assist shaft torsion bar assembly.

[0064] See also Fig.13, step S8 includes the following steps: first, execute step S81, pre-set a torque value, and record the torque value as the preset value. Next, execute step S82, start the servo motor, the servo motor drives the upper power-assist shaft to rotate, observe the torque sensor reading, when the torque sensor reading reaches the preset value, record the angle encoder reading at this time, and record the angle encoder reading as the first angle value. Then, execute step S83, reverse the servo motor, the servo motor drives the upper power-assist shaft to reverse, observe the torque sensor reading, when the torque sensor reading reaches the preset value again, record the angle encoder reading at this time, and record it as the second angle value. Finally, execute step S84, take the middle position between the first angle value and the second angle value, and the middle position is the centering position.

[0065] In this embodiment, the preset value needs to be determined according to the customer's process requirements. Assuming that the preset value required by the customer is 15N·m, when performing the centering process, first rotate the servo motor 111 to the left. When the torque reading displayed on the torque sensor 116 reaches 15N·m, the angle displayed on the angle encoder 115 is 5.1°, so the left deflection of 5.1° is the first angle value. Reverse the servo motor 111 to the right. When the reading of the torque sensor 116 reaches 15N·m again, record the reading of the angle encoder 115 at this time. If the reading is 5.2°, then the right deflection of 5.2° is the second angle value. Then the centering position should be the middle position between the left deflection of 5.1° and the right deflection of 5.2°, that is, the right deflection of 0.05°.

[0066] Although the present invention has been shown and described in conjunction with the present embodiment and the preferred embodiment, it should be understood by those skilled in the art that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined by the appended claims, and all of these changes are within the scope of protection of the present invention.

Claims

1. A double-head torsion bar press-fitting machine, comprising a base, a support frame, a press-fitting oiling device and a torsion bar press-fitting device, wherein the support frame is fixed above the base, the press-fitting oiling device and the torsion bar press-fitting device are arranged in the support frame, the torsion bar press-fitting device comprises an electric cylinder press-fitting mechanism and a lower platen, the lower platen is located below the electric cylinder press-fitting mechanism, the torsion bar press-fitting device also comprises a press-fitting assembly, a lower shaft mechanism, a positioning assembly, a torsion bar straightening mechanism and a feeding mechanism, the electric cylinder press-fitting mechanism can drive the press-fitting assembly to move up and down, the press-fitting oiling device, the feeding mechanism, the torsion bar straightening mechanism and the positioning assembly are all arranged on the upper surface of the lower platen, a through hole is opened on the lower platen, and the top end of the lower shaft mechanism extends out from the through hole, characterized in that: A lower booster shaft turbine assembly is arranged on the press-fit assembly, a limit hole is opened on the lower booster shaft turbine assembly, a mounting plate is arranged on the feeding mechanism, a support block is arranged on the mounting plate, a limit block is arranged on the upper surface of the support block, and the shapes of the limit hole and the limit block match; The lower shaft mechanism includes a servo motor, an angle encoder and a torque sensor, the output end of the servo motor is provided with a transmission belt, the transmission belt is provided with a connecting shaft, the connecting shaft connects the angle encoder and the torque sensor, an upper power-assisting shaft is provided on the torque sensor, a flat position is provided on the upper power-assisting shaft, and the phase angle of the flat position is the same as the phase angle of the limit block; A first clamping assembly is arranged inside the support cylinder of the press-fit assembly, and the first clamping assembly clamps the lower booster shaft turbine assembly; The lower shaft mechanism further includes a second clamping assembly, a chuck and a chuck seat, wherein the chuck seat is located on the top of the torque sensor, the chuck is arranged on the chuck seat, the second clamping assembly is arranged on the chuck, the upper power-assisting shaft is arranged on the chuck, and the second clamping assembly clamps the upper power-assisting shaft; The feeding mechanism further comprises a rising cylinder, an extending cylinder and a third clamping assembly, wherein the rising cylinder is located at the bottom of the feeding mechanism, the output end of the rising cylinder is connected to the bottom of the extending cylinder, the output end of the extending cylinder is connected to the third clamping assembly, and the third clamping assembly comprises a first clamping jaw, and the first clamping jaw is arranged on the mounting plate; The positioning assembly includes a first mounting seat and a laser micrometer, wherein the first mounting seat is arranged on the upper surface of the lower platen, and the laser micrometer is arranged on the first mounting seat, and the laser micrometer is used to detect the phase angle of the flat position; After the flat position is inserted into the limiting hole, the servo motor is started, and the servo motor drives the upper power-assisting shaft to rotate. The torque indication is observed through the torque sensor. When the indication reaches the preset value, it means that the flat position has rotated to the extreme position on one side. The rotation angle value at this time is recorded; then the servo motor is reversed. When the torque reaches the preset value again, it means that the flat position has rotated to the extreme position on the other side. The rotation angle value at this time is recorded, and then the middle position of the two deflection angle values ​​is taken as the mechanical centering position.

2. The double-head torsion bar press machine according to claim 1, characterized in that: The electric cylinder pressing mechanism includes an electric cylinder and an upper platen. The electric cylinder can drive the upper platen to move up and down. A pressure sensor is arranged on the electric cylinder, and a displacement sensor is arranged on the upper platen. The electric cylinder pressing mechanism also includes a support column, and the support column is arranged on the lower surface of the upper platen. A column is arranged between the upper platen and the lower platen.

3. The double-head torsion bar press machine according to claim 1, characterized in that: The press-fitting and oiling device includes a support seat, a press-fitting cylinder, an oiling cylinder, a mounting plate, and a transfer cylinder. The press-fitting cylinder and the oiling cylinder are located at the top of the support seat, the mounting plate and the transfer cylinder are located at the bottom of the support seat, and the transfer cylinder can push the mounting plate to move.

4. The double-head torsion bar press machine according to any one of claims 1 to 3, characterized in that: The torsion bar straightening mechanism includes a second mounting seat, a sliding cylinder and a fourth clamping assembly, wherein the second mounting seat is arranged on the upper surface of the lower platform, the sliding cylinder is arranged on the second mounting seat, and the fourth clamping assembly is arranged at one end of the sliding cylinder.

5. A working method of a double-head torsion bar press machine, using the double-head torsion bar press machine as claimed in claim 1, characterized in that: The working method comprises the following steps: Step S1: using the press-fit oiling device to press-fit the turbine and the lower booster shaft to form a lower booster shaft turbine assembly; Step S2: placing the upper power-assisting shaft on the lower shaft mechanism, and the lower shaft mechanism clamps the upper power-assisting shaft; Step S3: placing the torsion bar on the torsion bar press-fitting device, and the torsion bar press-fitting device presses the torsion bar into the upper power-assist shaft to form an upper power-assist shaft torsion bar assembly; Step S4: placing the lower booster shaft turbine assembly on the loading mechanism; Step S5: the feeding mechanism conveys the lower booster shaft turbine assembly to the torsion bar press-fitting device, the torsion bar press-fitting device clamps the lower booster shaft turbine assembly, and the feeding mechanism is reset; Step S6: the positioning assembly adjusts the angle of the upper power-assisting shaft assembly; Step S7: the press-fit assembly pre-tightens the lower booster shaft turbine assembly onto the upper booster shaft torsion bar assembly; Step S8: The lower shaft mechanism mechanically adjusts the upper power-assisting shaft assembly; Step S9: The press-fit assembly presses the lower power-assist shaft turbine assembly onto the upper power-assist shaft torsion bar assembly to form a power-assist shaft torsion bar assembly.

6. The working method according to claim 5, characterized in that: The step S8 comprises the following steps: Step S81: presetting a torque value, and recording the torque value as a preset value; Step S82: starting the servo motor, the servo motor drives the upper power-assisting shaft to rotate, observing the torque sensor reading, and when the torque sensor reading reaches the preset value, recording the angle encoder reading at this time, and recording the angle encoder reading as the first angle value; Step S83: Reverse the servo motor, so that the servo motor drives the upper power-assisting shaft to reverse, observe the torque sensor reading, and when the torque sensor reading reaches the preset value again, record the angle encoder reading at this time as the second angle value; Step S84: taking the middle position between the first angle value and the second angle value, wherein the middle position is the centering position.

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