Band sawing machine for cutting metal pieces

Abstract

This invention discloses a band saw for cutting metal parts, including a bed, a saw frame, a band saw blade mounted on the saw frame, and a first drive mechanism. The bed has a worktable with a special clamping fixture. The fixture includes a positioning base, a floating main pressure plate, and a lateral clamping mechanism. The lateral clamping mechanism includes a drive block and a clamping block. The drive block has a first inclined surface on its side wall, and the clamping block has a clamping surface and a second inclined surface that mates with the first inclined surface. A first spring is fixedly connected between the clamping block and the positioning base. This band saw for cutting metal parts uses a positioning groove for initial positioning, the floating main pressure plate for vertical clamping, and the lateral clamping mechanism for horizontal clamping. Through mechanical linkage, it achieves bidirectional synchronous clamping of the L-shaped contour of the metal part, effectively solving the problem of torsion and displacement that easily occurs during cutting due to the asymmetry and low rigidity of the metal part, thus ensuring the perpendicularity and flatness of the cut end face from the root.

Description

Technical Field

[0001] This invention relates to the field of metal cutting technology, and more specifically, to a band saw for cutting metal parts. Background Technology

[0002] Metal components, as a common structural material, are widely used in steel structures such as buildings, bridges, and towers. The accuracy and efficiency of their cutting directly affect the quality of subsequent welding and assembly. Band saws are commonly used for profile cutting due to their narrow kerf and high efficiency.

[0003] Currently, band saws used for cutting metal parts mostly employ general-purpose clamps for fixation, such as traditional flat-jaw vises or simple V-blocks. However, metal parts have unique L-shaped asymmetrical cross-sections and relatively low torsional rigidity, making it difficult for general-purpose clamps (such as flat-jaw vises) to perfectly match the L-shaped contour of the metal parts. During clamping, the force is often not evenly distributed, easily causing slight twisting or warping of the metal parts. Under the action of sawing force, this unstable clamping state is exacerbated, resulting in the cut end face not being perpendicular to the edge of the metal part, producing flatness errors, and seriously affecting the quality of subsequent processing. Therefore, improvements are needed. Summary of the Invention

[0004] The purpose of this invention is to provide a band saw for cutting metal parts, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A band saw for cutting metal parts includes a bed, a saw frame slidably mounted on the bed, a band saw blade mounted on the saw frame, and a first drive mechanism. The bed is provided with a worktable, and the worktable is provided with a special clamp for fixing metal parts. The special clamp includes: A positioning base is fixed to the surface of the workbench, and its upper surface has a positioning groove; A floating main pressure plate is driven by a second drive mechanism and is used to press the horizontal edge of the metal part placed in the positioning groove from above; A lateral clamping mechanism is used to simultaneously clamp the vertical edge of the metal part against the lateral reference surface of the positioning base from the side when the floating main pressure plate is pressed down. It includes a drive block fixed to the bottom of the floating main pressure plate and a clamping block slidably connected to the surface of the positioning base. The side wall of the drive block has a first inclined surface, and the clamping block has a clamping surface and a second inclined surface that cooperates with the first inclined surface. A first spring is fixedly connected between the clamping block and the positioning base.

[0007] Preferably, the upper end of the clamping block is provided with a first groove, and the floating main pressure plate is located in the first groove.

[0008] Preferably, a support block is provided on the clamping surface, the working surface of the support block is an arc surface, and the support block is used to support the thick corner portion of the clamping metal part.

[0009] Preferably, the side wall of the clamping block is provided with a second groove, and a first vibration damping module is fixedly installed between the clamping block and the support block, the first vibration damping module being located in the second groove.

[0010] Preferably, a second vibration damping module is fixedly connected to the bottom of the floating main pressure plate, and the free end of the second vibration damping module abuts against the inner right-angle side of the metal part.

[0011] Preferably, both the first vibration damping module and the second vibration damping module include a cylinder, a piston plate slidably connected inside the cylinder, a piston rod fixedly connected to the piston plate, and a second spring sleeved on the outer wall of the piston rod. The piston plate has a throttling hole. The second vibration damping module also includes a pressure block fixed to the free end of the piston rod. A branch pipe is fixedly connected between the two cylinders, and the cylinder and the branch pipe are filled with fluid.

[0012] Preferably, pressure sensors are embedded in the working surface of the floating main pressure plate, the bottom of the pressure block, the working surface of the positioning base, and the clamping surface of the clamping block.

[0013] Preferably, the piston plate has a flow hole, and a valve core is fixedly connected to the flow hole by a pre-tightening spring.

[0014] Preferably, the fluid filling the cylinder is a magnetorheological fluid, and an electromagnetic coil is provided on the inner wall of the cylinder, which is electrically connected to an external controller.

[0015] Preferably, the floating main pressure plate has a coolant flow channel inside, and the bottom of the floating main pressure plate has a nozzle that communicates with the coolant flow channel. The coolant flow channel inside the floating main pressure plate is connected to an external coolant supply system through a connector. The surface of the positioning base has a chip channel that communicates with an external negative pressure suction system.

[0016] By adopting the aforementioned technical solution, the beneficial effects of the present invention are: 1. Initial positioning is achieved through the positioning groove, vertical clamping is achieved using the floating main pressure plate, and horizontal clamping is achieved with the help of the lateral clamping mechanism. Through mechanical linkage, bidirectional synchronous clamping of the L-shaped contour of the metal part is realized, which effectively solves the problem of torsion and displacement that easily occurs during cutting due to the asymmetry and low rigidity of the metal part. This ensures the perpendicularity and flatness of the cutting end face from the root. At the same time, by integrating cooling function into the floating main pressure plate and chip removal function into the positioning base, coolant can directly reach the cutting point for efficient cooling and lubrication. Chips are actively sucked up and removed, avoiding accumulation on the L-shaped groove and positioning surface of the metal part. Together, these measures ensure the stability of cutting quality, extend saw blade life, and improve the working environment.

[0017] 2. The fluids inside the cylinders of the two vibration damping modules can flow and transmit pressure to each other through branch pipes, forming a hydraulically interconnected damping system. On the one hand, when one side is impacted and generates torque, the impact energy is shared with the second vibration damping module through the flowing fluid, thereby rapidly distributing the impact energy locally to the entire system to share the burden. It directly resists the torque that causes the metal parts to twist, converting harmful torsional vibration into fluid friction heat energy of the entire system, thus extremely efficiently suppressing the most fatal vibration mode of the metal parts and achieving energy sharing. On the other hand, during the vibration damping process, the fluid must flow through the throttling orifices on the two piston plates. When the fluid flows through the small orifices, it generates huge viscous resistance. This process converts the mechanical energy of the fluid into heat energy. The energy flows between the two modules, and it needs to flow through the throttling orifices twice and be consumed twice. At the same time, when the fluid flows through the long and thin branch pipe, it will rub against the pipe wall, generating additional friction heat and further consuming energy.

[0018] 3. When the band saw blade cuts the thin edge of a metal part in the vertical direction, the vibration amplitude is small, and the fluid pressure is insufficient to overcome the preload of the preload spring. The fluid mainly flows through the throttling orifice on the piston plate, providing basic damping force, and the system remains compliant. When the band saw blade cuts the thick corner of the metal part and the thin edge in the horizontal direction, the violent vibration causes the fluid pressure to increase sharply. The pressure overcomes the preload of the preload spring and pushes the valve core to open a larger channel. The larger channel means that more fluid can pass through when the piston plate moves at high speed, thereby generating a huge damping force, which quickly pulls and absorbs the impact. After the impact, the pressure decreases, and the valve core closes under the action of the preload spring, restoring the basic damping state. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0020] Figure 1 This is a schematic diagram of a band saw for cutting metal parts in one embodiment; Figure 2 This is a schematic diagram of a special fixture structure in one embodiment; Figure 3 This is a schematic diagram of the positioning base structure in one embodiment; Figure 4 This is a schematic diagram of a floating main pressure plate structure in one embodiment; Figure 5 This is a schematic diagram of the special fixture section in one embodiment; Figure 6 This is a schematic diagram of the lateral clamping mechanism structure in one embodiment; Figure 7 This is a schematic diagram of the lateral clamping mechanism and floating main pressure plate structure in one embodiment; Figure 8 This is a schematic diagram of the structure of the first and second vibration suppression modules in one embodiment; Figure 9 This is a cross-sectional structural schematic diagram of the first vibration damping module in one embodiment; Figure 10 for Figure 9 A magnified schematic diagram of the structure at point A in the diagram.

[0021] Figure label: 100. Bed; 110. Worktable; 200. Saw frame; 300. Band saw blade; 400. First drive mechanism; 500. Special fixture; 510. Positioning base; 511. Chip channel; 520. Floating main pressure plate; 521. Coolant flow channel; 522. Nozzle; 523. Connecting joint; 530. Lateral clamping mechanism; 531. Drive block; 532. Clamping block; 533. First inclined plane; 534. Clamping surface; 535. Second inclined plane; 536. First spring ; 537, First groove; 538, Second groove; 540, Positioning groove; 550, Support block; 560, First vibration damping module; 561, Cylinder; 562, Piston plate; 563, Piston rod; 564, Second spring; 565, Throttling orifice; 566, Branch pipe; 570, Second vibration damping module; 571, Pressure block; 572, Flow hole; 573, Preload spring; 574, Valve core; 575, Electromagnetic coil; 580, Pressure sensor; 590, Second drive mechanism. Detailed Implementation

[0022] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0023] like Figures 1-10As shown, a band saw for cutting metal parts includes a bed 100, a saw frame 200 slidably mounted on the bed 100, a band saw blade 300 mounted on the saw frame 200, and a first drive mechanism 400. A worktable 110 is provided on the bed 100, and a special clamp 500 for fixing metal parts is provided on the worktable 110. Please refer to... Figure 2 The special fixture 500 includes a positioning base 510, a floating main pressure plate 520, and a lateral clamping mechanism 530.

[0024] It should be further explained that the first drive mechanism 400 includes a power source, a transmission system, and a feed control system. The power source is usually an AC motor, a servo motor, or a hydraulic motor, which provides the initial power required for the band saw blade to cut. The transmission system transmits the rotational motion of the power source to the band saw blade 300 and mainly includes a drive wheel, a driven wheel, and a gearbox. The drive wheel is directly driven by the motor and is the main component that drives the band saw blade 300 to rotate cyclically. The driven wheel provides tension and guidance to ensure that the band saw blade 300 rotates correctly. The gearbox is used to reduce the speed and increase the output torque to adapt to different cutting materials (material and size of metal parts) and process requirements. The feed control system controls the feed motion of the saw frame 200 (i.e., the speed at which the band saw blade 300 cuts into the workpiece). The feed control system is usually a hydraulic servo system or an electromechanical servo system. The hydraulic servo system drives the saw frame 200 to rise and fall through a hydraulic cylinder and precisely controls the feed speed and pressure through a proportional valve or servo valve. The electromechanical servo system drives a ball screw or rack and pinion through a servo motor to achieve precise and stable feed of the saw frame 200.

[0025] Please refer to Figure 1 , Figure 2 and Figure 3 The positioning base 510 is fixed to the surface of the worktable 110, and the upper surface of the positioning base 510 has a positioning groove 540. Please refer to... Figure 4 The floating main pressure plate 520 is driven by the second drive mechanism 590, and the floating main pressure plate 520 is used to press the horizontal edge of the metal part placed in the positioning groove 540 from above.

[0026] It should be noted that the second drive mechanism 590 is a hydraulic cylinder, a pneumatic cylinder, or an electric push rod.

[0027] For details, please refer to Figure 3 and Figure 4 The floating main pressure plate 520 has a coolant flow channel 521 inside. The bottom of the floating main pressure plate 520 has a nozzle 522 that communicates with the coolant flow channel 521. The coolant flow channel 521 inside the floating main pressure plate 520 is connected to the external coolant supply system through a connector 523. The surface of the positioning base 510 has a chip channel 511 that communicates with the external negative pressure suction system.

[0028] It should be noted that the specific structure and working principle of the coolant supply system and the negative pressure suction system are existing technologies and will not be described in detail here. In addition, the chip channel 511 is located directly below the band saw blade 300.

[0029] By integrating cooling function into the floating main pressure plate 520 and chip removal function into the positioning base 510, coolant can directly reach the cutting point for efficient cooling and lubrication. Chips are actively sucked up and removed, avoiding accumulation on the L-shaped groove and positioning surface of the metal parts. Together, they ensure the stability of cutting quality, extend saw blade life, and improve the working environment.

[0030] Please refer to Figure 5 The lateral clamping mechanism 530 is used to simultaneously clamp the vertical edge of the metal part to the lateral reference surface of the positioning base 510 from the side when the floating main pressure plate 520 is pressed down. The lateral clamping mechanism 530 includes a drive block 531 fixed to the bottom of the floating main pressure plate 520 and a clamping block 532 slidably connected to the surface of the positioning base 510. The side wall of the drive block 531 has a first inclined surface 533. The clamping block 532 has a clamping surface 534 and a second inclined surface 535 that cooperates with the first inclined surface 533. A first spring 536 is fixedly connected between the clamping block 532 and the positioning base 510.

[0031] This band saw for cutting metal parts uses a positioning slot 540 for initial positioning, a floating main pressure plate 520 for vertical clamping, and a lateral clamping mechanism 530 for horizontal clamping. Through mechanical linkage, it achieves bidirectional synchronous clamping of the L-shaped contour of the metal part, effectively solving the problem of torsion and displacement that easily occurs during cutting due to the asymmetry and low rigidity of the metal part, and ensuring the perpendicularity and flatness of the cut end face from the root.

[0032] It should be noted that, please refer to Figure 6 The upper end of the clamping block 532 is provided with a first groove 537, and the floating main pressure plate 520 is located in the first groove 537. The first groove 537 provides lateral limiting and guidance for the floating main pressure plate 520, ensuring its stability during the up and down movement, preventing uneven clamping caused by the shaking of the pressure plate, and making the clamping action more precise and reliable.

[0033] Please refer to Figure 5 A support block 550 is provided on the clamping surface 534. The working surface of the support block 550 is an arc surface. The support block 550 is used to support the thick corner of the clamping metal part. The arc surface naturally fits the outer contour of the thick corner of the metal part, increasing the contact area and distributing the clamping force evenly in the area with the strongest rigidity of the thick corner, avoiding local deformation of the metal part caused by stress concentration, and providing better anti-torsional support.

[0034] Because the contact area and position between the band saw blade 300 and the L-shaped metal part constantly change (from the thin edge to the thick corner and back to the thin edge), the load fluctuates. This can easily cause impact to the band saw blade 300 when the contact area changes abruptly (e.g., from the thin edge of the metal part to the thick corner). Therefore, please refer to... Figure 7 and Figure 8 The side wall of the clamping block 532 is provided with a second groove 538. A first vibration damping module 560 is fixedly installed between the clamping block 532 and the support block 550. The first vibration damping module 560 is located in the second groove 538.

[0035] The vibration damping function is directly integrated into the main load-bearing component, the clamping block 532, which can quickly absorb and attenuate the cutting vibration transmitted to the special fixture 500 through the metal parts at the source. In particular, it suppresses the impact vibration generated when the band saw blade 300 contacts the thick corner, effectively protecting the band saw blade 300 and improving the cut quality.

[0036] Please refer to Figure 5 The bottom of the floating main pressure plate 520 is fixedly connected to a second vibration damping module 570. The free end of the second vibration damping module 570 abuts against the inner right-angle side of the metal part. The second vibration damping module 570 cooperates with the first vibration damping module 560 to set vibration damping points on the inner and outer sides of the metal part, forming a two-point support vibration damping system. This system can more comprehensively suppress various vibration modes (such as bending vibration and torsional vibration) generated by the metal part during the cutting process, and the vibration damping effect is more significant.

[0037] Please refer to Figure 8 and Figure 9 The first vibration damping module 560 and the second vibration damping module 570 both include a cylinder 561, a piston plate 562 slidably connected inside the cylinder 561, a piston rod 563 fixedly connected to the piston plate 562, and a second spring 564 sleeved on the outer wall of the piston rod 563. A throttling hole 565 is provided on the piston plate 562. The second vibration damping module 570 also includes a pressure block 571 fixed to the free end of the piston rod 563. A branch pipe 566 is fixedly connected between the two cylinders 561. The cylinders 561 and the branch pipe 566 are filled with fluid.

[0038] It should be further explained that one end of the branch pipe 566 is connected to the rodless cavity of the cylinder 561 on the first vibration damping module 560, and the other end of the branch pipe 566 is connected to the rod cavity of the cylinder 561 on the second vibration damping module 570. The fluid filled in the cylinder 561 and the branch pipe 566 is oil or air.

[0039] The fluids within the cylinders 561 of the two vibration damping modules can flow and transmit pressure to each other through the branch pipes 566, forming a hydraulically interconnected damping system. When one side is impacted, the pressure can be rapidly transmitted to the other side through the fluid, sharing and consuming vibration energy. The specific functions of the hydraulically interconnected damping system are as follows: 1. Highly effective suppression of torsional vibration Scenario: When the band saw blade 300 cuts into the thick corner of a metal part, it generates a huge torque that attempts to cause the metal part to torsionally vibrate around its axis.

[0040] How the hydraulic interconnection system works: The torsional load causes the thick corner portion of the metal part to tend to move towards the support block 550, thereby compressing the first vibration damping module 560 mounted on the clamping block 532; at the same time, the inner corner vertex of the metal part tends to move towards the positioning base 510, thereby stretching the second vibration damping module 570 mounted on the floating main pressure plate 520.

[0041] When the first vibration damping module 560 is compressed, the fluid pressure in the rodless chamber of its cylinder 561 increases. Due to the connection of the branch pipe 566, this high-pressure oil will immediately flow through the branch pipe 566 to the rod chamber of the cylinder 561 of the second vibration damping module 570, which is in a stretched state, to replenish the fluid and help it resist the stretching motion.

[0042] Effect: This process is equivalent to establishing a force flow channel between two vibration suppression points, which rapidly distributes the impact energy received locally to the entire system to share the burden. It directly resists the torque that causes the metal parts to twist, and converts the harmful torsional vibration into the fluid friction heat energy of the entire system, thereby suppressing the most fatal vibration mode of the metal parts extremely efficiently.

[0043] 2. Achieve balance and sharing of vibrational energy Energy input and pressure generation: The band saw blade 300 cuts the thick corner of the metal part, generating an impact force. This impact force is first transmitted to the first vibration damping module 560, which tightly clamps the thick corner of the metal part. The impact force pushes the support block 550, which in turn compresses the cylinder 561 of the first vibration damping module 560. The kinetic and potential energy of the mechanical vibration begins to be converted into the pressure energy of the fluid at this point, and the fluid pressure inside the compressed cylinder 561 increases instantaneously.

[0044] Energy sharing and pressure equalization: Since the first vibration damping module 560 and the second vibration damping module 570 are connected through the branch pipe 566 to form a closed hydraulic circuit, the high-pressure oil generated in the first vibration damping module 560 will immediately flow through the branch pipe 566 to the chamber of the second vibration damping module 570, which is at a lower pressure at this time. This is a dynamic process of seeking pressure balance.

[0045] The impact energy is no longer borne solely by the first vibration damping module 560, but is shared with the second vibration damping module 570 through the flowing fluid. Because the second vibration damping module 570 is injected with high-pressure fluid, its piston rod 563 also generates a force to resist the motion, thereby achieving energy sharing.

[0046] This binds two vibration damping points that might otherwise move independently (one compressed, the other slightly stretched or stationary) together, forcing them to move in tandem. The relative amplitude of their motion is reduced, thereby suppressing local warping or twisting of the metal parts and achieving vibration equalization.

[0047] Energy dissipation and damping effect: Whether the fluid flows from the first vibration damping module 560 to the branch pipe 566, or from the branch pipe 566 into the second vibration damping module 570, the fluid must flow through the throttling orifices 565 on the two piston plates 562. When the fluid flows through the small orifices, it will generate huge viscous resistance. This process will convert the pressure energy (mechanical energy) of the fluid into heat energy. The energy flows between the two modules and needs to flow through the throttling orifices 565 twice, and is consumed twice. At the same time, when the fluid flows through the long and thin branch pipe 566, it will rub against the pipe wall, generating additional frictional heat, further consuming energy.

[0048] 3. Provides a synergistic damping effect beyond simple superposition. When the fluid flows at high speed between the first damping module 560 and the second damping module 570, additional fluid resistance and inertial effects are generated, which enables the entire system to provide a greater instantaneous damping force than the sum of the peak damping forces of the two independent dampers when dealing with severe impacts, thus exhibiting stronger impact absorption capabilities.

[0049] Please refer to Figure 2 , Figure 3 and Figure 7 Pressure sensors 580 are embedded on the working surface of the floating main pressure plate 520, the bottom of the pressure block 571, the working surface of the positioning base 510, and the clamping surface 534 of the clamping block 532. This enables real-time and precise monitoring of the clamping force, effectively preventing workpiece loosening due to insufficient clamping force or workpiece deformation due to excessive clamping force. This provides a data basis for achieving closed-loop control of clamping force and ensuring processing safety and quality consistency.

[0050] Please refer to Figure 10 A flow hole 572 is provided on the piston plate 562, and a valve core 574 is fixedly connected to the flow hole 572 by a pre-tightening spring 573.

[0051] It should be noted that each piston plate 562 has two flow holes 572, and the two valve cores 574 on the same piston plate 562 are in opposite directions, so that the first vibration damping module and the second vibration damping module 570 are suitable for complex vibration conditions during the metal cutting process. Whether in a tensile or compressed state, as long as the impact force exceeds the preload of the preload spring 573, the flow holes 572 can be opened.

[0052] Since the band saw blade 300 first cuts the thin edge of the metal part in the vertical direction, the contact area between the band saw blade 300 and the metal part is small, and the resulting impact vibration is small. However, when cutting the thick corner of the metal part, the band saw blade 300 contacts the thin edge of the metal part in the horizontal direction, and the contact area between the band saw blade 300 and the metal part increases sharply. The friction force between the band saw blade 300 and the metal part increases sharply in a very short time, causing strong impact vibration. During this process, the magnitude of the impact force on the first vibration damping module 560 and the second vibration damping module 570 will change continuously with the progress of cutting. Therefore, by adding a flow hole 572 controlled by the preload spring 573 and the valve core 574, the damping force of the first vibration damping module 560 and the second vibration damping module 570 is automatically matched with the magnitude of the impact force.

[0053] During the stable cutting period (cutting the thin edge of the metal part in the vertical direction): the vibration amplitude is small, the fluid pressure is insufficient to overcome the preload of the preload spring 573, the fluid mainly flows through the throttle hole 565 on the piston plate 562 to provide basic damping force, and the system remains compliant.

[0054] Impact load period (cutting the thick corner of the metal part and the thin edge in the horizontal direction): The violent vibration causes the fluid pressure to increase sharply. The pressure overcomes the preload of the preload spring 573 and pushes the valve core 574 to open a larger channel. The larger channel means that more fluid can pass through when the piston plate 562 moves at high speed, thereby generating a huge damping force, which quickly pulls and absorbs the impact. After the impact, the pressure decreases and the valve core 574 closes under the action of the preload spring 573, restoring the basic damping state.

[0055] Please refer to Figure 9 The fluid filled inside cylinder 561 is magnetorheological fluid, and an electromagnetic coil 575 is installed on the inner wall of cylinder 561. The electromagnetic coil 575 is electrically connected to an external controller.

[0056] The viscosity of magnetorheological fluid changes dramatically instantaneously under the influence of a magnetic field. By applying different control currents to the electromagnetic coil 575, the magnitude of the damping force can be controlled in real time, precisely, and steplessly. The controller adjusts the current of the electromagnetic coil 575 in real time based on feedback from the pressure sensor 580, which allows for precise and instantaneous stepless adjustment of the damping force, ensuring that the vibration suppression system is always in the best working state and achieving optimal adaptation to complex and variable cutting conditions.

[0057] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A band saw for cutting metal parts, comprising a bed (100), a saw frame (200) slidably disposed on the bed (100), a band saw blade (300) disposed on the saw frame (200), and a first drive mechanism (400), wherein a worktable (110) is provided on the bed (100), characterized in that, The workbench (110) is provided with a special clamp (500) for fixing metal parts, the special clamp (500) comprising: A positioning base (510) is fixed to the surface of the worktable (110), and its upper surface has a positioning groove (540). The floating main pressure plate (520) is driven by the second drive mechanism (590) and is used to press the horizontal edge of the metal part placed in the positioning groove (540) from above; A lateral clamping mechanism (530) is used to simultaneously clamp the vertical edge of the metal part against the lateral reference surface of the positioning base (510) from the side when the floating main pressure plate (520) is pressed down. It includes a drive block (531) fixed to the bottom of the floating main pressure plate (520) and a clamping block (532) slidably connected to the surface of the positioning base (510). The side wall of the drive block (531) has a first inclined surface (533). The clamping block (532) has a clamping surface (534) and a second inclined surface (535) that cooperates with the first inclined surface (533). A first spring (536) is fixedly connected between the clamping block (532) and the positioning base (510). The clamping block (532) has a second groove (538) on its side wall. A first vibration damping module (560) is fixedly installed between the clamping block (532) and the support block (550). The first vibration damping module (560) is located in the second groove (538). The bottom of the floating main pressure plate (520) is fixedly connected to a second vibration damping module (570), and the free end of the second vibration damping module (570) abuts against the inner right-angle side of the metal part. The first vibration damping module (560) and the second vibration damping module (570) both include a cylinder (561), a piston plate (562) slidably connected inside the cylinder (561), a piston rod (563) fixedly connected to the piston plate (562), and a second spring (564) sleeved on the outer wall of the piston rod (563). The piston plate (562) is provided with a throttling hole (565). The second vibration damping module (570) also includes a pressure block (571) fixed to the free end of the piston rod (563). A branch pipe (566) is fixedly connected between the two cylinders (561). The cylinders (561) and the branch pipe (566) are filled with fluid.

2. The band saw for cutting metal parts according to claim 1, characterized in that, The upper end of the clamping block (532) is provided with a first groove (537), and the floating main pressure plate (520) is located in the first groove (537).

3. A band saw for cutting metal parts according to claim 2, characterized in that, A support block (550) is provided on the clamping surface (534). The working surface of the support block (550) is an arc surface. The support block (550) is used to support the thick corner of the clamping metal part.

4. A band saw for cutting metal parts according to claim 3, characterized in that, Pressure sensors (580) are embedded on the working surface of the floating main pressure plate (520), the bottom of the pressure block (571), the working surface of the positioning base (510), and the clamping surface (534) of the clamping block (532).

5. A band saw for cutting metal parts according to claim 4, characterized in that, The piston plate (562) has a flow hole (572), and a valve core (574) is fixedly connected inside the flow hole (572) by a preload spring (573).

6. A band saw for cutting metal parts according to claim 5, characterized in that, The fluid filled in the cylinder (561) is a magnetorheological fluid, and an electromagnetic coil (575) is provided on the inner wall of the cylinder (561). The electromagnetic coil (575) is electrically connected to an external controller.

7. A band saw for cutting metal parts according to any one of claims 1 to 6, characterized in that, The floating main pressure plate (520) is provided with a coolant flow channel (521) inside. The bottom of the floating main pressure plate (520) is provided with a nozzle (522) that communicates with the coolant flow channel (521). The coolant flow channel (521) inside the floating main pressure plate (520) is connected to an external coolant supply system through a connector (523). The surface of the positioning base (510) is provided with a chip channel (511), which is connected to an external negative pressure suction system.

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