Multi-point straightening device and method for multi-blade special-shaped rod

Abstract

In order to solve the problem that an existing straightening method cannot be directly suitable for a cross spiral special-shaped rod, the multi-point straightening device for the multi-blade special-shaped rod is characterized in that a plurality of supporting mechanisms are arranged in parallel and are sequentially mounted on a sliding rail from left to right; the first electric slide rail is used for mounting a laser sensor; the second electric sliding rail is used for mounting the screw-down mechanism; the special-shaped rod workpiece is straightened by controlling the rolling reduction of the pressure head; and the rotating chuck is located at the left end of the sliding rail and connected with the motor, and the special-shaped rod workpiece can rotate by 180 degrees plus or minus. And precise multi-point straightening of the special-shaped rod with the complex special-shaped structure is realized through straightening algorithms of rough straightening and fine straightening. According to the invention, straightness measurement and precise multi-point straightening can be carried out on rod parts with complex structures of special-shaped sections and uneven screw pitches. The invention relates to the technical field of straightening.

Description

Technical Field

[0001] The present invention relates to the field of straightening technology, and in particular to a multi-point straightening device and method for a multi-leaf special-shaped rod. Background Art

[0002] In recent years, in order to improve the economy, anti-diffusion capability and heat transfer efficiency of nuclear reactors, various countries have updated and optimized nuclear reactor components. Improving the geometry of nuclear fuel rods to increase the power density of light water reactors is an important research direction. Universities in Russia, the United States and Canada have carried out research and development of spiral fuel rods with a cross-shaped cross section, improving the traditional fuel cladding tubes with a circular cross section into spiral fuel rods with a cross-shaped cross section. This fuel rod belongs to the field of special-shaped rods, with a large aspect ratio, high density of fuel in the tube, thin wall, axial spiral, and cross-shaped cross-section structural characteristics (such as Figure 2 During fuel rod assembly, straightness must meet precision requirements to ensure equipment quality and service performance. Therefore, precise alignment of irregularly shaped cladding and cross-helical fuel rods plays a crucial role in fuel rod manufacturing.

[0003] China started research on straightening technology relatively late. In the early days, most companies still used manual straightening methods to straighten parts. This straightening method was labor-intensive, had poor accuracy, and low straightening efficiency. After 2000, domestic straightening technology began to develop gradually.

[0004] At present, domestic and foreign research on the straightening of pipe and shaft parts mainly focuses on parts with regular cross-sections, such as round tubes, plates, and circular cross-section shaft parts. When straightening such parts, the straightness measurement and straightening are relatively simple and can be completed in three-dimensional space. However, for structures with large aspect ratios, special-shaped cross-sections, high density of fuel in the tube, thin walls, axial spirals, and cross-shaped cross-sections, the complex structural characteristics of the parts themselves make it difficult to accurately extract their axes. The existing straightening mechanisms and their measurement and pressure methods cannot be directly applied to special-section bars. Summary of the Invention

[0005] In view of the complex structure of cross-spiral special-shaped rods, the existing straightening equipment and methods are difficult to accurately extract their axes, resulting in difficulty in straightening. Therefore, a multi-point straightening device and method for multi-leaf special-shaped rods are proposed. The device can measure the straightness of rods with special-shaped cross-section spiral structures. Through reasonable support system design and straightening algorithm, multi-point straightening of special-shaped rods with uneven pitch can be achieved.

[0006] The technical solution adopted by the present invention to solve the above problems is: The present invention provides a multi-point straightening device for a multi-leaf special-shaped rod, comprising: A marble panel, mounted on the machine frame, serves as a high-precision reference plane; Slide rails, mounted on the upper surface of the marble panel; Multiple support mechanisms are used to provide support for the special-shaped rod workpiece. The multiple support mechanisms are arranged in parallel and are installed on the slide rail in sequence from left to right. Each support mechanism can slide left and right along the length direction of the slide rail. A first electric slide rail is arranged parallel to the slide rail and is used to install a laser sensor; A second electric slide rail is located above the slide rail and is used to install a pressing mechanism; A pressing mechanism is installed on the second electric slide rail and straightens the special-shaped bar workpiece by controlling the pressing amount of the pressing head; The rotary chuck is located at the left end of the slide rail and is connected to the motor to realize the rotation of the special-shaped rod workpiece at an angle of plus or minus 180 degrees.

[0007] Furthermore, each supporting mechanism includes a supporting block, a wedge block, a fastening knob, a rectangular slider and a push rod. The lower end of the rectangular slider is provided with a slide groove that cooperates with the slide rail, and the upper part is provided with a cavity for accommodating the supporting block and the wedge block. The supporting block and the wedge block are located in the rectangular cavity from top to bottom. The front part of the rectangular slider is provided with an opening for the wedge block to extend, and the rear part of the rectangular slider is provided with a push rod. One end of the push rod is connected to the cylinder, and the other end passes through the rectangular slider to contact the wedge block. The push rod is used to push the wedge block to move through the extension and contraction of the push rod to realize the upward or downward movement of the support block; the lower part of the rectangular slider is provided with a fastening knob, and the end of the fastening knob passes through the rectangular slider and is threadedly connected to the slide rail, and the fastening knob is used to fix the rectangular slider to the slide rail.

[0008] Furthermore, the support block is a block made of nylon material, and its upper surface is arc-shaped. The number of support mechanisms is determined according to the length of the special-shaped rod, and the distance between each support mechanism is adjustable.

[0009] Furthermore, the pressing mechanism includes a pressing head, a motor, a screw, and a slider. The slider is slidably connected to a second electric slide rail, which enables the slider to move left and right, thereby driving the pressing head to move. The motor is fixed to the slider, and the output end of the motor is connected to the upper end of the pressing head via a screw. The motor rotates the screw, thereby causing the pressing head to move downward. The motor and screw are fixedly connected, and the screw and pressing head are threaded.

[0010] Furthermore, the shape of the pressure head is an inverted "V" shape, the "V" angle is 90 degrees, and the pressure head is made of nylon.

[0011] Furthermore, the straightening device also includes a baffle, which is installed on a supporting block on the right side. A U-shaped groove is provided at the upper end of the baffle, and the workpiece is located in the U-shaped groove to prevent the workpiece from falling.

[0012] The present invention also provides a multi-point straightening method for a multi-leaf special-shaped rod, comprising the following steps: Step 1: Install the workpiece and adjust the positions between the support mechanisms. Place the special-shaped bar workpiece on the support block, and fix the left end of the special-shaped bar workpiece to the rotary chuck. Adjust the positions of the support block mechanisms from left to right so that the upper surface of each support block is tangent to the adjacent fillet of the special-shaped cross-section of the special-shaped bar workpiece. Avoid twisting of the workpiece during straightening. Step 2: Install the baffle on the support block of the rightmost support mechanism, with the special-shaped bar workpiece located in its U-shaped groove; Step 3: Scan the cross section of the special-shaped bar workpiece with a laser sensor, extract the axis coordinates and calculate the straightness error; Step 4: Roughly calibrate the special-shaped bar workpiece to be tested: use the interval integration method to determine the maximum bending interval, and apply a reduction at the midpoint of the interval; Step 5: Precision calibrate the special-shaped bar workpiece to be measured: Calculate the compensation pressing amount at the high point position according to the straightness error curve.

[0013] Furthermore, in step 4, the interval integration method in the rough calibration stage includes: dividing the deflection curve of the straightened workpiece into different intervals, calculating the specific values ​​of different intervals by curve integration, and the interval with the largest absolute value is considered to have the largest degree of bending, and this interval is selected as the straightening area; the calculation formula for different intervals is:

[0014] Where: f(x) is the deflection curve of the workpiece, i is the corresponding support block, and xi is the position of the corresponding support block.

[0015] Furthermore, in step five, during the fine calibration phase, if one straightening cannot effectively eliminate the curvature of the workpiece, that is, the position of the highest point of the deflection curve remains unchanged, then the next pressing amount needs to be accumulated with the previous straightness error. Thereafter, the pressing amount for each pressing at the same position is increased by the previously accumulated error value hi * cumulative deviation coefficient p on the fine calibration pressing base amount. The calculation formula for the pressing amount is as follows: H=h0'+Σerror×p Σerror=h1+h2+···hn=Σhi The smaller the span of the support point, the smaller the downward pressure will be. Otherwise, the workpiece will be crushed. Therefore, when only two adjacent support blocks are pressing down, a certain amount of downward pressure will be reduced on the basis of the basic downward pressure, which is called the single span reduction stroke h. d In addition, the relative position relationship between the pressure point support blocks needs to be considered during straightening. Therefore, the pressure reduction coefficient s is set close to the support. At this time, the pressure reduction stroke is calculated as follows: Press down to reduce the stroke = t × s t = highest point position - center position of support block span From the above, the reduction during fine straightening is: H=h0'+Σhi×p-h d -t×s h0' is the initial reduction for fine calibration.

[0016] Furthermore, the fine-tuning phase involves dynamically adjusting the position of the support blocks. When the pressure point approaches a support block, the adjacent support blocks are raised to avoid interference. Specifically, a cylinder drives the push rod to extend and retract, moving the wedge block to raise and lower the support block.

[0017] The beneficial effects of the present invention are: 1. The present invention adopts an arc-shaped upper surface design of the support block, which is tangent to the adjacent rounded corners of the special-shaped cross-section of the special-shaped rod workpiece, thus avoiding the phenomenon of workpiece twisting during straightening. The support block can move horizontally along the slide rail to adjust the spacing, effectively solving the problem of uneven support pitch of the spiral rod workpiece. 2. The present invention adopts an inverted V-shaped pressure head design, combined with nylon material, which not only ensures the pressure strength but also avoids damage to the workpiece surface. The pressure head acts directly on the workpiece and straightens the workpiece by controlling the amount of pressure. The electric slide rail can ensure that the pressure head moves left and right to meet the needs of striking different positions of the workpiece. 3. The support block of the present invention is connected to the wedge block, and the support block is moved in the vertical direction by a pneumatic device. The rise and fall of the support block can be controlled to avoid interference between the pressure head and the workpiece, thereby ensuring the safety of straightening thin-walled special-shaped bars; 4. Since the workpiece to be measured has poor rigidity, the initial straightness is relatively large, and the initial bending form is irregular, in order to speed up the straightening speed, the present invention adopts a rough calibration + fine calibration straightening method. The rough calibration adopts the interval integration method to quickly locate the maximum bending interval. The straightness after rough calibration reaches 0.5 mm / m; the fine calibration adopts the straightness error curve to find the highest point of the bending and calculate the downward pressure for straightening. The straightness after fine calibration reaches 0.1 mm / m. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the straightening device of the present invention; Figure 2 is a cross-sectional view of a multi-leaf shaped rod that needs to be straightened according to the present invention; Figure 3 It is a structural schematic diagram of the support mechanism of the present invention; Figure 4 It is a structural schematic diagram of the pressing mechanism of the present invention; Figure 5 Schematic diagram of the pressing head of the pressing mechanism of the present invention; Figure 6 This is a curve diagram of the straightness plotting method of the present invention; Figure 7This is a curve diagram of the pressure error of the present invention; Figure 8 Schematic diagram of the method for calculating the error value accumulated during fine calibration of the present invention; Figure 9 This is a schematic diagram of different pressure point positions during fine calibration of the present invention; Figure 10 This is a schematic diagram of the alignment of the present invention at different spans; Figure 11 This is a schematic diagram of the situation where the pressure point position deviates from the midpoint of the support block of the present invention; Figure 12 Schematic diagram of the straightness error curve before and after multi-point straightening of the present invention; Figure 13 This is a real picture of the special-shaped rod before and after multi-point straightening of the present invention. DETAILED DESCRIPTION

[0019] Specific implementation method 1: Figure 1 As shown, this embodiment proposes a multi-point straightening device for multi-leaf special-shaped rods, including a control panel 1, a rotary chuck 2, a laser sensor 3, a support mechanism 4, a pressing mechanism 5, a baffle 6, a slide rail 7, a marble panel 8, a frame 9, a first electric slide rail 10 and a second electric slide rail 11. The control panel 1 integrates a straightening parameter preset function; the marble panel 8 is installed on the frame 9 as a high-precision reference plane; the slide rail 7 is installed on the upper surface of the marble panel 8.

[0020] like Figure 3 As shown, multiple support mechanisms 4 are used to provide support for special-shaped rod workpieces. Multiple support mechanisms 4 are arranged in parallel and are installed on the slide rail 7 from left to right. Each support mechanism can slide left and right along the length direction of the slide rail 7; each support mechanism 4 includes a support block 4-1, a wedge block 4-2, a tightening knob 4-3, a rectangular slider 4-4 and a push rod 4-5. The lower end of the rectangular slider 4-4 is provided with a slide groove that cooperates with the slide rail 7, and the upper part is provided with a cavity for accommodating the support block 4-1 and the wedge block 4-2. The support block 4-1 and the wedge block 4-2 are located in the rectangular cavity from top to bottom, and the front of the rectangular slider 4-4 is provided with The opening is used for the wedge block 4-2 to extend out, and a push rod 4-5 is provided at the rear of the rectangular slider 4-4. One end of the push rod 4-5 is connected to the cylinder, and the other end passes through the rectangular slider 4-4 to contact the wedge block. During the straightening process, it is necessary to flexibly select different support blocks according to the change of the workpiece deflection. The wedge block 4-2 is pushed to move by the extension and contraction of the push rod 4-5 to realize the upward or downward movement of the support block 4-1; a tightening knob 4-3 is provided at the lower part of the rectangular slider 4-4, and the end of the tightening knob 4-3 passes through the rectangular slider 4-4 and is threadedly connected to the slide rail 7. The tightening knob 4-3 is used to fix the rectangular slider 4-4 to the slide rail 7.

[0021] Preferably, the support block 4-1 is a block made of nylon material, the upper surface of which is arc-shaped with a diameter of 20-40 mm; the number of support mechanisms 4 is determined according to the length of the special-shaped rod, and the support mechanism 4 can be flexibly moved left and right in the horizontal direction through the rails to adapt to workpieces with uneven pitch.

[0022] like Figure 1 As shown, the baffle 6 is installed on a supporting block 4-1 on the right side. The baffle 6 is a rectangular plate with a U-shaped groove on its upper end. The workpiece is located in the U-shaped groove to prevent the workpiece from falling.

[0023] The first electric slide rail 10 is arranged parallel to the slide rail 7 and is used to install the laser sensor 3; the laser sensor is used to scan the cross-section of the part in a projection direction to obtain its cross-section characteristics in the plane. According to the geometric relationship, the center line of the cross-section characteristics obtained by the sensor is the axis of the special-shaped rod. The coordinate values ​​of each point on the axis are plotted on the coordinate graph, and the points are connected in sequence to obtain a straightness trajectory graph. The straightness error value of the special-shaped rod is calculated by the drawing method.

[0024] The second electric slide rail 11 is located above the slide rail 7 and is used to install the pressing mechanism 5; the pressing mechanism 5 is installed on the second electric slide rail 11, such as straightening the special-shaped rod workpiece by controlling the pressing amount of the pressure head; Figure 4 As shown, the pressing mechanism 5 includes a pressing head 5-1, a motor 5-2, a screw 5-3, and a slider 5-4. The slider 5-4 is slidably connected to a second electric slide 11. The second electric slide 11 can move the slider 5-4 left and right, thereby driving the pressing head 5-1 to move. The motor 5-2 is fixed to the slider 5-4, and the output end of the motor 5-2 is connected to the upper end of the pressing head 5-1 through the screw 5-3. The screw 5-3 is rotated by the motor 5-2, thereby causing the pressing head 5-1 to move downward. The motor 5-2 and the screw 5-3 are fixedly connected, and the screw 5-3 and the pressing head 5-1 are threadedly connected.

[0025] like Figure 5 As shown, the lower end of the ram 5-1 is shaped like an inverted "V" at a 90° angle. Made of nylon, the ram 5-1 directly impacts the workpiece, straightening it by controlling the amount of pressure applied. A motorized slide allows the ram 5-1 to move left and right, allowing it to strike different locations on the workpiece.

[0026] The rotating chuck 2, located at the left end of the slide rail 7, is connected to a motor and allows the profiled bar workpiece to rotate through a range of ±180°. The pressing head 5-1 can only move downward from top to bottom. If the highest point is measured to be below the workpiece, the workpiece must be flipped 180° before straightening. After straightening, it is flipped another 180° to reset. After straightening one horizontal direction, the workpiece must be flipped 90° to continue with the vertical direction.

[0027] Specific embodiment 2: This embodiment describes a multi-point straightening method for a multi-leaf shaped rod. The cross-sectional shape of the multi-leaf shaped rod straightened by the present invention is as follows: Figure 2 As shown, the cross-shaped cross-section of the thin-walled core tube is complex, with several important dimensions a1-a4 and a pitch of 800±20mm. The straightening method is based on the straightening device described in the first embodiment and specifically includes the following steps: Step 1. Install the workpiece and adjust the position of each support mechanism 4. Workpieces with special-shaped cross-sections and spiral structures must ensure stable support during straightening. The pitch of the workpiece fluctuates within a small range, so adjust the position of the corresponding support block before straightening. Place the special-shaped rod workpiece on the support block 4-1, and fix the left end of the special-shaped rod workpiece to the rotary chuck 2; adjust the position of each support block mechanism 4 from left to right, ensuring that the upper surface of each support block 4-1 is tangent to the adjacent fillet of the special-shaped cross-section of the special-shaped rod workpiece; avoid twisting of the workpiece during straightening; Step 2: After the support mechanism 4 is adjusted, the baffle 6 is installed on the support block 4-1 of the rightmost support mechanism 4, and the special-shaped rod workpiece is located in its U-shaped groove; Step 3: Figure 6 As shown in the figure, a laser sensor is used to scan the cross section of a part in a projection direction to obtain its cross section features in the plane. According to the geometric relationship, the center line of the cross section features obtained by the sensor is the axis of the multi-leaf special-shaped rod. The coordinate values ​​of each point on the axis are plotted on a coordinate graph, and the points are sequentially connected to obtain a straightness trajectory graph. The straightness error value of the special-shaped rod is obtained by the drawing method. The specific drawing steps are as follows: 1. Draw the line Lab connecting the first and last points A and B on the measured straight line graph; 2. Measure the maximum and minimum deviations dmax and dmin of each point on and below the line connecting the two end points along the Z direction; 3Straightness error value, fab=dmax-dmin.

[0028] Step 4. The principle of the multi-point straightening method is three-point bending. By controlling the amount of pressure, the special-shaped rod is bent back to achieve the purpose of straightening. However, the rigidity of large aspect ratio core-filled tube and shaft-type parts is poor, the initial straightness is relatively large, and the initial bending form is irregular. In order to speed up the straightening speed, the rough calibration + fine calibration straightening method is adopted.

[0029] Step 4.1 Rough calibration of the special-shaped rod workpiece to be tested: Rough calibration is to straighten the initial workpiece so that its straightness after rough calibration is no more than 0.5mm / m. The straightening method during rough calibration is the interval integration method, that is, the deflection curve of the straightened workpiece is divided into different intervals. In this example, the workpiece pitch is 800±20mm and the length is 1600mm, so 9 support mechanisms are used. The 9 support blocks are divided into 8 intervals, namely 1-3, 2-4,..., 7-9. The deflection curve of the workpiece can be obtained by the laser sensor, and the specific values ​​of different intervals are calculated by curve integration. The interval with the largest absolute value is considered to have the largest degree of bending, and this interval is selected as the straightening area. The calculation formula for different intervals is:

[0030] Where: f(x) is the deflection curve of the workpiece, i is the corresponding support block, x i is the position of the corresponding support block.

[0031] During straightening, the pressure points are evenly arranged between the support points. For example, for the interval 1-3, the pressing and striking position is the position between the support blocks 1 and 3.

[0032] The number of intervals can be adjusted based on actual conditions, for example, adding intervals 1-2, 2-3, ..., 8-9. In this case, the width of the integral interval affects the integral value, so the integral coefficient is increased. That is, the value after integration in each interval must be multiplied by the integral coefficient. The integral coefficient is related to the size of the interval.

[0033] During rough calibration, the initial pressure reduction, pressure increment, overpressure reduction, and pressure limit are set for each strike position. This means that during rough calibration, the straightening is performed by continuously increasing the pressure reduction. This method is relatively simple. By setting a large initial pressure reduction and incremental pressure, the straightness value of a workpiece with high initial straightness can be quickly reduced.

[0034] During rough alignment, the pressure error curve is set, that is, based on the initial pressure, the pressure error value is added. Then the actual pressure during rough alignment is equal to the initial pressure + pressure increment + pressure error value.

[0035] Step 4.2: Fine-calibrate the special-shaped bar workpiece to be measured: Fine-calibration is to further straighten the workpiece after rough calibration, so that its straightness after fine calibration is not greater than 0.1 mm / m.

[0036] When the workpiece's straightness is less than or equal to the specified straightness, fine calibration begins. Fine calibration involves finding the highest point of the bend based on the straightness error curve and calculating the required pressure for straightening. The workpiece's straightness error curve is obtained through sensor measurement. The highest point on the curve is used as the pressure point. During fine calibration, the initial pressure h0' is set, and the pressure at different points is calculated using an algorithm as follows: During fine calibration, if the highest point of the deflection curve remains unchanged, the next press-down amount needs to be added to the previous straightness error. After that, the press-down amount for each press-down at the same position is added to the fine calibration press-down base amount by the previously accumulated error value * cumulative deviation coefficient p. The formula for calculating the press-down amount is as follows: H = h0' + Σerror × p ΣError = h1 + h2 + ... hn =Σhi During fine straightening, the bending form of the workpiece is random, so the straightness error curve is also random. In the deflection curve, there is a situation where the highest point falls near the support block or the support block. In order to avoid interference between the indenter and the support block during straightening, set the support block span critical value, such as Figure 9 For example, after each straightness test, if the distance between the highest point and the centerline of the nearest support block is less than the set value (point B), support blocks 1 and 3 will be raised and support block 2 will be lowered. If the distance exceeds the set value (point A), support blocks 1 and 2 will be raised, and the indenter will press down between them.

[0037] like Figure 9 As shown in the figure, the smaller the span of the support point, the smaller the downward pressure, otherwise the workpiece will be crushed. Therefore, when only two adjacent support blocks are pressing down, a certain amount of downward pressure will be reduced on the basis of the basic downward pressure, which is called the single span reduction stroke h d .

[0038] During fine calibration, when the pressing position is close to the support block, the pressing amount should be reduced appropriately to avoid damaging the workpiece. Therefore, set the pressure coefficient close to the support to reduce the pressure coefficient. In fine calibration mode, it is inevitable that the pressing position of the indenter deviates from the midpoint of the support. Figure 11 As shown, the amount of stroke reduction by pressing down is calculated at this time: Press down to reduce the stroke = t × s t = highest point position - center position of support block span From the above, the reduction during fine straightening is: H = h0' + Σhi×p -h d - t×s Figure 12 This is a schematic diagram of the straightness error curve before and after the multi-point straightening according to an embodiment of the present invention. Figure 13 This is a physical picture of the special-shaped rod before and after the multi-point straightening described in the embodiment of the present invention.

[0039] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement of the above embodiments made according to the technical essence of the present invention, within the spirit and principles of the present invention, without departing from the content of the technical solution of the present invention, shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A multi-point straightening device for multi-leaf shaped rods, characterized in that: The straightening device comprises: A marble panel (8) mounted on a frame (9); A slide rail (7) is mounted on the upper surface of the marble panel (8); A plurality of support mechanisms (4) provide support for the special-shaped rod workpiece, wherein the plurality of support mechanisms (4) are arranged in parallel and are sequentially installed on the slide rail (7) from left to right, and each support mechanism (4) can slide left and right along the length direction of the slide rail (7); A first electric slide rail (10) is arranged parallel to the slide rail (7) and is used for mounting a laser sensor (3); A second electric slide rail (11), located above the slide rail (7) and used for mounting the pressing mechanism (5); A pressing mechanism (5) is mounted on the second electric slide rail (11); The rotary chuck (2) is mounted on the left end of the slide rail (7) and is connected to one end of the special-shaped rod workpiece.

2. A multi-point straightening device for multi-leaf shaped rods according to claim 1, characterized in that: Each supporting mechanism (4) comprises a supporting block (4-1), a wedge block (4-2), a tightening knob (4-3), a rectangular slider (4-4) and a push rod (4-5); the lower end of the rectangular slider (4-4) is provided with a slide groove matched with the slide rail (7); the upper portion is provided with a cavity for accommodating the supporting block (4-1) and the wedge block (4-2); the supporting block (4-1) and the wedge block (4-2) are located in the rectangular cavity from top to bottom; the front portion of the rectangular slider (4-4) is provided with an opening for the wedge block (4-2) to extend; the rear portion of the rectangular slider (4-4) is provided with a push rod (4-5); one end of the push rod (4-5) is connected to the cylinder, and the other end passes through the rectangular slider (4-4) to contact the wedge block; the lower portion of the rectangular slider (4-4) is provided with a tightening knob (4-3); the end of the tightening knob (4-3) passes through the rectangular slider (4-4) and is threadedly connected to the slide rail (7).

3. A multi-point straightening device for multi-leaf shaped rods according to claim 2, characterized in that: The support block (4-1) is a block made of nylon material, and its upper surface is arc-shaped.

4. The multi-point straightening device for multi-leaf shaped rods according to claim 1, characterized in that: The pressing mechanism (5) comprises a pressing head (5-1), a motor (5-2), a screw (5-3) and a slider (5-4); the slider (5-4) is slidably connected to the second electric slide rail (11); the motor (5-2) is fixed on the slider (5-4); and the output end of the motor (5-2) is connected to the upper end of the pressing head (5-1) via the screw (5-3).

5. The multi-point straightening device for multi-leaf shaped rods according to claim 4, characterized in that: The shape of the pressure head (5-1) is an inverted "V" shape, the "V" angle is 90 degrees, and the material of the pressure head (5-1) is nylon.

6. The multi-point straightening device for multi-leaf shaped rods according to claim 1, characterized in that: The straightening device further comprises a baffle (6), which is mounted on a certain support block (4-1) on the right side, and a U-shaped groove is provided at the upper end of the baffle (6).

7. A multi-point straightening method for multi-leaf special-shaped rods, using the straightening device according to any one of claims 1 to 5, characterized in that: The steps include: Step 1: Install the workpiece and adjust the positions between the support mechanisms (4), place the special-shaped rod workpiece on the support block (4-1), and fix the left end of the special-shaped rod workpiece to the rotary chuck (2); adjust the positions of the support block mechanisms (4) from left to right in sequence so that the upper surface of each support block (4-1) is tangent to the adjacent fillet of the special-shaped cross section of the special-shaped rod workpiece; Step 2: Install the baffle (6) on the support block (4-1) of the rightmost support mechanism (4), with the special-shaped rod workpiece located in its U-shaped groove; Step 3: Scan the cross section of the special-shaped bar workpiece with the laser sensor 3 to extract the axis coordinates and calculate the straightness error; Step 4: Roughly calibrate the special-shaped bar workpiece to be tested: use the interval integration method to determine the maximum bending interval, and apply a reduction at the midpoint of the interval; Step 5: Precision calibrate the special-shaped bar workpiece to be measured: Calculate the compensation pressing amount at the high point position according to the straightness error curve.

8. The multi-point straightening method for a multi-leaf special-shaped rod according to claim 7, wherein in step 4, the interval integration method in the rough calibration stage comprises: The deflection curve of the straightened workpiece is divided into different intervals. The specific values ​​of different intervals are calculated by curve integration. The interval with the largest absolute value is considered to have the largest degree of bending, and this interval is selected as the straightening area. The calculation formula for different intervals is: Where: f(x) is the deflection curve of the workpiece, i is the corresponding support block, xi is the position of the corresponding support block, and the straightness after rough calibration reaches 0.5mm / m.

9. The multi-point straightening method for multi-leaf special-shaped rods according to claim 7, characterized in that: In step 5, during the fine calibration stage, if one straightening cannot effectively eliminate the curvature of the workpiece, that is, the position of the highest point of the deflection curve remains unchanged, the next pressing amount needs to be accumulated with the previous straightness error. After that, the pressing amount of each pressing at the same position is added to the fine calibration pressing amount by the error value hi*accumulated deviation coefficient p accumulated each time. The calculation formula of the pressing amount is as follows: H=h0'+Σerror×p Σerror=h1+h2+···hn=Σhi When only two adjacent support blocks are pressed down, the amount of pressure on the foundation will be reduced by a certain amount, which is called the single span reduction stroke h d In addition, the relative position relationship between the pressure point support blocks needs to be considered during straightening. The pressure reduction coefficient s is set close to the support. The reduction stroke of the pressure is calculated as follows: Press down to reduce the stroke = t × s t = highest point position - center position of support block span From the above, the reduction during fine straightening is: H=h0'+Σhi×p-h d -t×s h0' is the initial reduction of fine calibration; the straightness after fine calibration reaches 0.1 mm / m.

10. The multi-point straightening method for multi-leaf special-shaped rods according to claim 7, characterized in that: The fine calibration stage also includes dynamically adjusting the position of the support block (4-1). When the pressure point approaches the support block (4-1), the adjacent support block (4-1) is raised to avoid interference.

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