Straightening and sawing system and straightening and sawing method for copper and aluminum bars

Abstract

The invention discloses a copper aluminum bar straightening and sawing system and a straightening and sawing method thereof.The copper aluminum bar straightening and sawing system comprises a sawing system used for cutting stub bars at the two ends of a bar raw material in sequence so as to obtain a bar product with the preset length, and a straightening system is arranged on the feeding side of the sawing system; the straightening system comprises a centering mechanism, the centering mechanism can axially adjust the position of the bar raw material until the bar body is centered with the straightening mechanism, and the two ends of the bar body correspond to the positions of the two end fixing mechanisms respectively; the end part fixing mechanism forms axial and radial constraining forces on the end part of the rod body and enables the axes of the two ends of the rod body to coincide; and in a constraint state of the end part fixing mechanism, the straightening mechanism can form radial pressure on the middle part of the bar raw material. According to the bar straightening device, bars can be straightened before being sawn, so that better bar product quality and packaging quality are obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of copper-aluminum bar processing, and in particular to a copper-aluminum bar straightening and sawing system and a straightening and sawing method therefor. Background Art

[0002] During the production process of copper-aluminum bars, the bar raw materials need to be sawed into bar products with consistent lengths and then bundled and packed. Due to the influence of force or temperature during the transportation of the bar raw materials, the bar body may undergo a certain degree of bending deformation, which may cause the inclination of the sawing surface and affect the sawing accuracy of the length of the bar products, and thus comprehensively affect the quality of the bar products after sawing. Moreover, bundling bar products with different lengths, uneven end faces, bent or straight shapes together cannot obtain good packing quality. Summary of the Invention

[0003] Object of the Invention: In order to overcome the deficiencies in the prior art, the present invention provides a copper-aluminum bar straightening and sawing system and a straightening and sawing method therefor, which can straighten the bar before sawing to obtain better quality of bar products and packing quality.

[0004] Technical Solution: To achieve the above object, a copper-aluminum bar straightening and sawing system and a straightening and sawing method therefor of the present invention include a sawing system for successively cutting off the two end pieces of the bar raw material to obtain a bar product with a preset length, and a straightening system is arranged on the feeding side of the sawing system;

[0005] The straightening system includes a centering mechanism capable of axially adjusting the position of the bar raw material so that its bar body is centered with the straightening mechanism, and the two ends of the bar body respectively correspond to the positions of the two end fixing mechanisms;

[0006] The end fixing mechanism forms axial and radial constraints on the end of the bar body and makes the axes of the two ends of the bar body coincide; under the constraint state of the end fixing mechanism, the straightening mechanism can form a radial pressure on the middle part of the bar raw material.

[0007] Further, the straightening mechanism includes a pressing die capable of actively applying pressure and forming a radial pressure on the middle part of the bar raw material; two bearing dies are arranged on both sides of the pressing die, capable of supporting the bar body and forming radial pressures on both sides of the middle part of the bar raw material, and capable of sliding along the axis of the bar body end; the pressing die and the bearing dies respectively generate radial pressures in opposite directions on the bar raw material.

[0008] Further, the two bearing dies can synchronously slide closer to or away from each other.

[0009] Further, the two pressure-bearing dies longitudinally support the lower side of the bar stock, and the top-pressure die longitudinally presses the upper side of the bar; the centering mechanism adopts a two-way roller path, and the two-way roller path can be adjusted up and down to be located above or below the support surface of the pressure-bearing die; the two end fixing mechanisms are respectively located outside both ends in the conveying direction of the two-way roller path.

[0010] Further, the end fixing mechanism includes a roller group and a pressing roller. The roller group is arranged to be lifted and lowered, and can be automatically positioned so that its support surface is flush with the upper end surface of the pressure-bearing die. When they are flush, the pressing roller can press the end of the bar stock on the support surface of the roller group; the roller group includes two rollers parallel to the pressing roller, and the two rollers are spaced in the horizontal plane. When the pressing roller presses the end of the bar stock on the roller group, the roller surfaces of the two rollers and the pressing roller are all tangent to the outer circular surface of the bar stock.

[0011] Further, an arc-shaped groove adapted to the surface of the bar body of the bar stock is provided at the lower part of the top-pressure die, and the two rollers can rotate synchronously and in the same direction, and drive the bar body to rotate around the axis of its pressed part. When the bar body rotates, its middle part is located in the arc-shaped groove; after the bar body is straightened and the arc-shaped groove is in the lower limit position, its arc groove surface just completely fits the outer circular surface of the bar body.

[0012] Further, the upper part of the pressure-bearing die is provided with a V-shaped groove. When the support surface of the roller group is flush with the upper end surface of the pressure-bearing die, the roller surfaces of the two rollers are respectively tangent to the two side groove walls of the V-shaped groove.

[0013] Further, rubber cushion layers are provided on both side surfaces of the V-shaped groove, and pressure sensors are embedded in the rubber cushion layers. The two pressure sensors are electrically connected to the rotation driving device of the roller group and the sliding driving devices of the two pressure-bearing dies through a control module.

[0014] Further, the sawing system includes a first long roller path and a second long roller path, which are parallel to each other, and sawing devices are provided at both ends away from each other; one end of the first long roller path provided with a sawing device is connected to one end of the two-way roller path through a transition roller path; photoelectric sensors are provided at both sawing devices, and can control the start and stop of the corresponding long roller path by detecting the length of the passing bar; a transfer mechanism is further included, which can transport the bar stock on the first long roller path to the second long roller path, and at the same time transport the bar stock on the second long roller path to the blanking rack, and the blanking rack is located on the side of the second long roller path away from the first long roller path.

[0015] Further, it includes the following steps:

[0016] Step Ⅰ, when the centering mechanism and the roller group are both in the lower limit position, load the bar stock onto the two pressure-bearing dies, and detect whether the bar stock is straight through the two groups of pressure sensors on the two pressure-bearing dies;

[0017] Step Ⅱ, lift the bar stock off the pressure-bearing die through the bidirectional roller table; if the detected values of the two groups of pressure sensors are the same, convey the bar stock to the transition roller table through the bidirectional roller table; if the detected values of the two groups of pressure sensors are different, adjust the bar stock through the bidirectional roller table so that its two ends correspond to the two end fixing mechanisms;

[0018] Step Ⅲ, the two side roller groups rise synchronously to be flush with the pressure-bearing die, the two pressure-bearing dies move relatively away from each other to be close to the two side roller groups, and then place the bar stock on the roller group and the pressure-bearing die by lowering the bidirectional roller table, and press the end of the bar stock on the roller group through the pressure roller;

[0019] Step Ⅳ, first drive the bar stock to rotate by the two end roller groups, and at the same time lower the top pressure die to approach the middle of the bar body. When the top pressure die is lowered to the lower limit position, the two side pressure-bearing dies slide synchronously closer to the nearest position, and then slide synchronously away to the farthest position, and repeat this several times until the detected values of the two groups of pressure sensors are the same;

[0020] Step Ⅴ, stop the rotation of the roller group and lift the pressure roller; after the bidirectional roller table rises and lifts the bar stock, the roller group moves down, and convey the bar stock to the transition roller table by the bidirectional roller table;

[0021] Step Ⅵ, the transition roller table conveys the bar stock to the sawing system, and completes double-end sawing successively. Both sawings control the sawing position by measuring the length that the same end of the bar body has passed through the photoelectric sensor.

[0022] Beneficial effects: A copper-aluminum bar straightening and sawing system and its straightening and sawing method of the present invention can straighten the bar more gently by first fixing both ends, then applying pressure in the middle, and cooperating with the rotation of the bar body and the straightening action in the axial direction, ensuring that no creases and cross-sectional deformations are generated during the straightening process of the bar, and ensuring the shape quality of the bar body. And it can handle the straightening operations of solid and hollow bar bodies. After straightening, the bar can make the sawing end face more flat and perpendicular to the axis. And cooperating with the fixed-length detection method and double-end sawing method of the sawing system can make the accuracy of the bar product higher, and thus obtain a higher-quality bar product comprehensively. And the bar after straightening and sawing is straight, the end faces are flush, and the lengths are the same, and the bundling and packing effect is better. Description of the Drawings

[0023] Figure 1 It is the overall structural schematic diagram of a copper-aluminum bar straightening and sawing system of the present invention;

[0024] Figure 2 The figure is a schematic structural diagram of a straightening system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] As attached Figure 1-2 The copper and aluminum bar straightening and sawing system and the straightening and sawing method thereof include a sawing system for successively cutting off the ends of the bar raw materials to obtain a bar product of a preset length. The straightening system is arranged on the feeding side of the sawing system; the bar raw materials are straightened and then sent to the sawing system for sawing, ensuring that the double-end ends of the bar are cut off in a straight state, thereby ensuring that the final bar product is straight and has high length accuracy, and the end face is flat and perpendicular to the axis, so as to obtain better product quality and packaging effect.

[0027] The straightening system includes a centering mechanism 1, which can axially adjust the position of the rod material until its rod body is aligned with the straightening mechanism 2, and the two ends of the rod body correspond to the positions of the two end fixing mechanisms 3 respectively; the end fixing mechanisms 3 form axial and radial constraints on the ends of the rod body, and make the double-end axes of the rod body coincide; under the constraint state of the end fixing mechanisms 3, the straightening mechanism 2 can form radial pressure on the middle part of the rod material. Among them, the two ends of the rod are first fixed and clamped to ensure that the clamped parts of the two ends of the rod remain in a coaxial state, and then the middle part of the rod is radially pressurized to adjust it to be coaxial with the two ends, thereby achieving the straightening effect. The clamping of the two ends enters the axial and radial directions of the rod to form a restraining force, so that the rod cannot slip along the axial direction and cannot produce radial runout, but can form rotation around the axis. This can avoid the situation where the radial pressure applied by the straightening mechanism to the middle part of the rod is inconsistent with the bending direction of the rod. The rod can offset the torsional stress by rotating, so that the rod only undergoes axial bending deformation to adjust the straightening without torsional deformation.

[0028] The straightening mechanism 2 includes a top pressure die 21, which can actively apply pressure and form radial pressure on the middle part of the bar material; pressure-bearing dies 22 are arranged on both sides of the top pressure die 21, which can support the rod body and form radial pressure on both sides of the middle part of the bar material, and can slide along the axis of the end of the rod body; the top pressure die 21 and the pressure-bearing die 22 respectively generate radial pressure in relative directions on the bar material. Among them, the two pressure-bearing dies constitute a pressure-bearing whole, and the top pressure die 21 actively approaches the rod body to apply pressure to drive the rod body to deform. As the top pressure die approaches the pressure-bearing die, the space where the rod body can be deformed is continuously reduced. Finally, the pressure-bearing whole and the top pressure die jointly form a clamping force on the middle part of the rod body, and make the rod body axis of the clamped part in the middle coincide with the rod body axis of the clamped part at both ends, so as to achieve the straightening effect.

[0029] The two pressure-bearing dies 22 can slide synchronously closer to or away from each other. On the basis of forming limiting restraint forces on the two ends and the middle part of the rod body through the end fixing mechanism and the pressing die, by using the relative sliding of the two pressure-bearing dies, straightening actions are respectively applied to the rod bodies on both sides, and then gradually the rod body between the two constraint points gradually approaches and finally achieves a straight and smooth connection. The two pressure-bearing dies 22 can be controlled to slide synchronously through a controller. Of course, they can also slide independently for adjustment, playing a role of fixed-point support. By maintaining pressure at the fixed points, key pressure is applied to straighten the section with a larger degree of bending.

[0030] Preferably, the two pressure-bearing dies 22 longitudinally support the lower side of the raw rod material, and the pressing die 21 longitudinally presses the upper side of the rod material. The two pressure-bearing dies 22 only make lateral sliding movements, and the pressing die only makes longitudinal pressing movements. When feeding, the raw rod material can be directly placed on the pressure-bearing die, and then the pressing die longitudinally presses on the raw rod material; the centering mechanism 1 adopts a bidirectional roller path, and the bidirectional roller path can be adjusted up and down to be located above or below the support surface of the pressure-bearing die 22. Through its lifting, the lifting and placing actions of the raw rod material can be realized, so as to realize the conversion of the raw rod material between the bidirectional roller path and the pressure-bearing die 22. When centering needs to be adjusted, the rod material is lifted from the pressure-bearing die, and the moving direction of the rod material is controlled by controlling the rotation direction of the rollers. Move the rod material until the two ends of the rod material respectively correspond to the end fixing mechanisms on both sides. After centering is completed, the rod material is placed back on the pressure-bearing die 22 for straightening; the two end fixing mechanisms 3 are respectively located outside the two ends of the conveying direction of the bidirectional roller path, and photoelectric sensors are arranged outside the end fixing mechanisms. When the photoelectric sensors on both sides detect the ends of the rod material, it can be regarded as the completion of centering. Based on this, the two end fixing mechanisms can perform a sliding movement relatively away from or close to the bidirectional roller path, so that when straightening raw rod materials of different lengths, the distance between the two end fixing mechanisms can be adjusted according to the approximate length of the raw rod material first, and the symmetry of the two fixing mechanisms relative to the centering mechanism and the straightening mechanism is ensured, so as to realize the double-end clamping and fixing of raw rod materials of different lengths.

[0031] Moreover, the sliding setting of the two end fixing mechanisms can also, after fixedly clamping the ends of the rod body, through the synchronous relative away sliding movement on both sides, realize the axial stretching of the raw rod material, playing a role of slightly straightening. First, by reducing the degree of bending of the rod body, the middle part of the rod body is more easily brought into the clamping and straightening range of the straightening mechanism, and then through the cooperation of the pressing and straightening actions of the pressing die and the pressure-bearing die, the final straightening effect is completed.

[0032] The end fixing mechanism 3 includes a roller set 31 and a pressure roller 32. The roller set 31 is arranged to be lifted and lowered, and can be automatically positioned so that its supporting surface is flush with the upper end surface of the pressure-bearing die 22. When they are flush, the pressure roller 32 can press the end of the bar stock against the supporting surface of the roller set 31. The roller set 31 includes two rollers parallel to the pressure roller 31, and the two rollers are spaced in the horizontal plane. When the pressure roller 32 presses the end of the bar stock against the roller set 31, the roller surfaces of the two rollers and the pressure roller 32 are all tangent to the outer cylindrical surface of the bar stock. By jointly clamping the end of the bar body with three parallel rollers, the formed clamping force is applied along the radial direction of the bar body, and the contact area between the rollers and the bar body in the axial direction is the largest. Thus, a clamping force is formed in the radial direction and a sliding frictional resistance is formed in the axial direction, thereby forming radial and axial restraint forces. In the circumferential direction, only static friction exists between the outer cylindrical surface of the bar body and each roller, and the bar body and the three rollers can rotate together.

[0033] Preferably, an arc-shaped groove adapted to the surface of the bar body of the bar stock is provided at the lower part of the top pressure die 21, which can exert radial pressure on the middle part of the bar body within a large angle range. And the two rollers can rotate synchronously in the same direction and drive the bar body to rotate around the axis of its pressed part. By actively driving the two rollers to rotate, the bar body can be driven to rotate actively, thereby realizing functions such as changing the bending direction of the bar body and assisting in straightening. When the bar body rotates, its middle part is located in the arc-shaped groove. After the bar body is straightened and the arc-shaped groove is in the lower limit position, its arc groove surface just completely fits the outer cylindrical surface of the bar body. When the bar stock is in a bent state, the rotating bar stock will sweep across the arc groove surface, and with the downward pressure of the top pressure die, within the time period of sweeping across the entire groove surface, the bar stock is forced to be straightened to a certain extent. With the continuous downward pressure of the top pressure die and the continuous rotation of the bar stock, the bar stock gradually becomes flat. When it is completely flat, the bar stock rotates completely fitting the arc-shaped groove surface, playing a role in slow shaping. For the straightening of a hollow bar body, the structure and roundness of its annular wall can be maintained, and wrinkles or ellipticity of the cross-section caused by axial bending adjustment can be avoided, ensuring the shape quality of the straightened bar stock.

[0034] Preferably, the upper part of the pressure-bearing die 22 is provided with a V-shaped groove. When the supporting surface of the idler roller group 31 is flush with the upper end surface of the pressure-bearing die 22, the roller surfaces of the two idler rollers are respectively tangent to the two side groove walls of the V-shaped groove. When ensuring complete straightening, the rod body can contact multiple idler rollers and the two V-shaped groove surfaces simultaneously. On this basis, rubber cushion layers are arranged on the two side surfaces of the V-shaped groove, and pressure sensors are embedded in the rubber cushion layers. The two pressure sensors are electrically connected to the rotation driving device of the idler roller group 31 and the sliding driving devices of the two pressure-bearing dies 22 through a control module. The rubber cushion layer can buffer the extrusion force on the surface of the rod material to avoid generating indentations or scratches. And when the rod material is completely straightened, the rod material can contact and be tangent to the four groove surfaces of the two V-shaped grooves simultaneously. In theory, the detected values of multiple pressure sensors should be the same. Of course, a certain error is allowed, and within a small error range, the values can also be considered the same, and then it is determined that the straightening is completed. On the contrary, if the rod material is placed in the two V-shaped grooves at the same time and the readings of the four pressure sensors differ greatly, there must be a phenomenon of rod material bending. Or the values of the four sensors are similar. When the value differs greatly from the preset value and is on the small side, it is very likely that it fails to fit the groove surface completely, so there is also a possibility of rod body bending. Therefore, by embedding pressure sensors on the V-shaped groove surface, it can be used to detect whether the rod material is bent during feeding and whether it is straightened in place after straightening.

[0035] The sawing system can adopt a common sawing production line, as long as it can complete the sawing of both ends of the stock. Example: The sawing system includes a first long roller path 4 and a second long roller path 5, which are parallel to each other, and sawing devices 5 are arranged at both ends where they are relatively far away from each other; One end of the first long roller path 4 where the sawing device 6 is arranged is connected to one end of the bidirectional roller path through a transition roller path 7; Photoelectric sensors are arranged at both sawing devices 6, and can control the start and stop of the corresponding long roller path by detecting the length of the rod body passing by; It also includes a transfer mechanism, which can transport the rod material on the first long roller path 4 to the second long roller path 5, and at the same time transport the rod material on the second long roller path 5 to the blanking rack 8, and the blanking rack 8 is located on the side of the second long roller path 5 far away from the first long roller path 4. Limit frames are arranged at both ends of the first long roller path 4 and the second long roller path 5 far away from the sawing device.

[0036] The specific straightening and sawing method includes the following steps:

[0037] Step I, when the centering mechanism 1 and the idler roller group 31 are both in the lower limit position, load the rod material raw material onto the two pressure-bearing dies 22, and detect whether the rod material raw material is straight through the two groups of pressure sensors of the two pressure-bearing dies 22;

[0038] Step Ⅱ: Lift the bar stock off the pressure-bearing die 22 through the bidirectional roller table. If the detected values of the two groups of pressure sensors are the same, that is, the bar stock itself is relatively straight, then convey the bar stock to the transition roller table 7 through the bidirectional roller table, and the straightening link can be skipped. After being conveyed to the transition roller table 7, directly jump to Step Ⅵ for end sawing, effectively improving the production efficiency of the bar stock.

[0039] If the detected values of the two groups of pressure sensors are different, then adjust the bar stock through the bidirectional roller table so that its two ends correspond to the two end fixing mechanisms 3, and prepare to perform the straightening action.

[0040] Step Ⅲ: The two side roller groups 31 rise synchronously to be flush with the pressure-bearing die 22. The two pressure-bearing dies 22 move relatively away from each other until they are close to the two side roller groups 31. Then, lower the bidirectional roller table to place the bar stock on the roller groups 31 and the pressure-bearing die 22, and press the ends of the bar stock tightly on the roller groups 31 through the pressure rollers 32.

[0041] Step Ⅳ: First, drive the bar stock to rotate by the two end roller groups 31, and at the same time, lower the top pressure die 21 to approach the middle of the bar body. When the top pressure die 21 is lowered to the lower limit position, the two pressure-bearing dies 22 slide synchronously closer to the nearest position, and then slide synchronously away to the farthest position, and repeat this many times until the detected values of the two groups of pressure sensors are the same.

[0042] When straightening bars with different bending degrees, different action combinations can be adopted to obtain better straightening effects. When straightening bars with a small bending degree, since the horizontal angle between the axes at both ends of the bar is small, it is easier for the end fixing mechanism to make the axes at both ends collinear through clamping and fixing. Then, after the two ends of the bar body are clamped, the bar body can be directly driven to rotate and cooperate with the sliding away of the two side end fixing mechanisms, so that the bar body rotates and stretches while forcing the ends of the bar body to quickly be tangent to the two rollers and the pressure rollers. Then, perform the pressing action of the top pressure die and the reciprocating sliding action of the two pressure-bearing dies in sequence as described above until the straightening is completed.

[0043] When straightening a bar with a large degree of bending, since the horizontal angle between the axes of the two ends of the bar is large, the end fixing mechanism cannot directly clamp to make the axes of the two ends collinear. First, move the two pressure-bearing molds to the farthest positions on both sides, and then slightly lift the roller group above the pressure-bearing molds, so that the bar takes the two roller groups on both sides as fulcrums, and its bent part naturally sags. Ensure that when the top pressure mold is pressed down to the limit position, it can contact the bar body. On this basis, move the two pressure-bearing molds on both sides closer to the position of the top pressure mold, so as to restrain the sheet to form a posture with both ends upturned. Then, in this posture, synchronously perform the synchronous downward movement of the two roller groups on both sides, the synchronous away movement of the two roller groups on both sides, and the pressing action of the pressing roller relative to the corresponding roller group. When the roller group moves down to be horizontally aligned with the pressure-bearing mold, the pressing roller just presses the end of the bar on the roller group, and then adjust the large-degree bending to a small-degree bending through the straightening action first, and then rotate the bar body as described above, and sequentially complete the downward pressing action of the top pressure mold and the reciprocating sliding action of the two pressure-bearing molds until the straightening is completed.

[0044] Step V, stop the rotation of the roller group 31 and lift the pressing roller 32; after the bidirectional roller table rises and lifts the bar stock, the roller group 31 moves down, and the bidirectional roller table conveys the bar stock to the transition roller table 7;

[0045] Step VI, the transition roller table 7 conveys the bar stock to the sawing system, and double-end sawing is completed successively. Both sawing operations control the sawing position by measuring the length of the same end of the bar body passed by the photoelectric sensor. Specifically, the straightened bar will be conveyed by the transition roller table to the first long roller table 4. When the bar is conveyed to the first long roller table, it must pass through the sawing device at its end. Through the photoelectric pair-emitting sensor at the sawing position, the length of the bar body passing through is measured. When the preset length is reached, the conveying of the first long roller table is stopped. After the bar body is fixed on the roller table by a fixing mechanism such as a pressing rod, the sawing device completes the sawing of one end of the bar stock. After the sawing is completed, the first long roller table drives the bar to continue to move until its end contacts the limit frame, and then the transfer mechanism transports the bar to the second long roller table 5. Subsequently, the second long roller table 5 conveys the bar to the sawing device at its end. Similarly, when passing through the sawing position, the length of the bar body passing through is measured by the photoelectric pair-emitting sensor. When the preset length is reached, the conveying of the second long roller table is stopped, and then the bar body is fixed and the sawing of the bar end is completed. Since the two long roller tables are parallel to each other, the bar is also transported in parallel, and the two sawing devices are respectively located at the relatively far ends of the two long roller tables. Therefore, when the bar passes through the two sawing devices, the sawing position is controlled by measuring the moving distance of the same end of the bar, and after straightening, the ends of the bar are relatively straight, which makes the length dimension accuracy of the final sawn bar product higher.

[0046] The above description is only a preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the above principles of the present invention, several improvements and modifications can be made, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A copper-aluminum bar straightening and sawing system, characterized in that: It includes a sawing system for successively cutting off the end pieces of a bar stock to obtain a bar product of a preset length, and a straightening system is arranged on the feeding side of the sawing system; The straightening system includes a centering mechanism (1) capable of axially adjusting the position of the bar stock so that its bar body is centered with the straightening mechanism (2), and the two ends of the bar body respectively correspond to the positions of the two end fixing mechanisms (3); The end fixing mechanism (3) forms axial and radial binding forces on the end of the bar body and makes the axes of the two ends of the bar body coincide; under the constraint state of the end fixing mechanism (3), the straightening mechanism (2) can form a radial pressure on the middle part of the bar stock.

2. The copper-aluminum bar straightening and sawing system according to claim 1, wherein: The straightening mechanism (2) includes a pressing die (21) capable of actively applying pressure and forming a radial pressure on the middle part of the bar stock; two bearing dies (22) are arranged on both sides of the pressing die (21), capable of supporting the bar body and forming radial pressures on both sides of the middle part of the bar stock, and capable of sliding along the axis of the bar body end; the pressing die (21) and the bearing dies (22) respectively generate radial pressures on the bar stock in opposite directions.

3. The copper-aluminum bar straightening and sawing system according to claim 2, wherein: The two bearing dies (22) can slide synchronously closer to or away from each other.

4. The copper-aluminum bar straightening and sawing system according to claim 3, characterized in that: The two bearing dies (22) longitudinally support the lower side of the bar stock, and the pressing die (21) longitudinally presses the upper side of the bar stock; the centering mechanism (1) adopts a two-way roller path, and the two-way roller path can be lifted and adjusted to be located above or below the supporting surface of the bearing die (22); the two end fixing mechanisms (3) are respectively located outside both ends of the two-way roller path in the conveying direction.

5. A copper-aluminum bar straightening and sawing system according to claim 4, characterized in that: The end fixing mechanism (3) includes a roller group (31) and a pressing roller (32). The roller group (31) is arranged to be lifted and can be automatically positioned so that its supporting surface is flush with the upper end surface of the bearing die (22). When they are flush, the pressing roller (32) can press the end of the bar stock on the supporting surface of the roller group (31); the roller group (31) includes two rollers parallel to the pressing roller (31), and the two rollers are spaced in the horizontal plane. When the pressing roller (32) presses the end of the bar stock on the roller group (31), the roller surfaces of the two rollers and the pressing roller (32) are all tangent to the outer cylindrical surface of the bar stock.

6. The copper-aluminum bar straightening and sawing system according to claim 5, wherein: An arc-shaped groove adapted to the surface of the bar body of the bar stock is arranged at the lower part of the pressing die (21), and the two rollers can rotate synchronously in the same direction and drive the bar body to rotate around the axis of its pressed part. When the bar body rotates, its middle part is located in the arc-shaped groove; after the bar body is straightened and when the arc-shaped groove is in the lower limit position, its arc groove surface just completely fits with the outer cylindrical surface of the bar body.

7. The copper-aluminum bar straightening and sawing system according to claim 6, wherein: The upper part of the bearing die (22) is provided with a V-shaped groove. When the supporting surface of the roller group (31) is flush with the upper end surface of the bearing die (22), the roller surfaces of the two rollers are respectively tangent to the two side groove walls of the V-shaped groove.

8. A copper-aluminum bar straightening and sawing system according to claim 7, characterized in that: Both sides of the V-shaped groove are provided with rubber cushion layers, and pressure sensors are embedded in the rubber cushion layers. The two pressure sensors are electrically connected to the rotation driving device of the roller group (31) and the sliding driving devices of the two pressure-bearing molds (22) through a control module.

9. The copper-aluminum bar straightening and sawing system according to claim 4, wherein: The sawing system includes a first long roller path (4) and a second long roller path (5), which are parallel to each other, and sawing devices (5) are arranged at the relatively far ends of both; one end of the first long roller path (4) where the sawing device (6) is arranged is connected to one end of the bidirectional roller path through a transition roller path (7); photoelectric sensors are arranged at both sawing devices (6), and can control the start and stop of the corresponding long roller path by detecting the length of the passing rod; it also includes a transfer mechanism, which can transport the rod material on the first long roller path (4) to the second long roller path (5), and at the same time transport the rod material on the second long roller path (5) to the blanking rack (8), and the blanking rack (8) is located on the side of the second long roller path (5) away from the first long roller path (4).

10. The straightening and sawing method of a copper-aluminum bar straightening and sawing system according to claim 1, characterized in that It includes the following steps: Step Ⅰ, when the centering mechanism (1) and the roller group (31) are both in the lower limit position, load the bar stock onto the two pressure-bearing molds (22), and detect whether the bar stock is straight through the two groups of pressure sensors of the two pressure-bearing molds (22). Step Ⅱ, lift the bar stock away from the pressure-bearing mold (22) through the bidirectional roller path; if the detected values of the two groups of pressure sensors are the same, transport the bar stock to the transition roller path (7) through the bidirectional roller path; if the detected values of the two groups of pressure sensors are different, adjust the bar stock through the bidirectional roller path so that its two ends correspond to the two end fixing mechanisms (3). Step Ⅲ, the two side roller groups (31) rise synchronously to be flush with the pressure-bearing molds (22), the two pressure-bearing molds (22) move relatively away from each other to be close to the two side roller groups (31), and then place the bar stock on the roller group (31) and the pressure-bearing molds (22) by lowering the bidirectional roller path, and press the ends of the bar stock on the roller group (31) through the pressing roller (32). Step Ⅳ, first drive the bar stock to rotate by the two end roller groups (31), and at the same time make the top pressing mold (21) press down close to the middle of the rod body. When the top pressing mold (21) presses down to the lower limit position, the two side pressure-bearing molds (22) slide synchronously close to the nearest position, and then slide synchronously away to the farthest position, and repeat this many times until the detected values of the two groups of pressure sensors are the same. Step Ⅴ, stop the rotation of the roller group (31) and lift the pressing roller (32); after the bidirectional roller path rises and lifts the bar stock, the roller group (31) moves down, and the bar stock is transported to the transition roller path (7) by the bidirectional roller path. Step Ⅵ, the transition roller path (7) transports the bar stock to the sawing system, and double-end sawing is completed successively, and both sawings control the sawing position by measuring the length of the same end of the rod body passed by the photoelectric sensor.

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