Automatic drilling equipment for automobile stamping parts

Abstract

The application discloses an automatic drilling equipment for automobile stamping parts, relates to the technical field of automobile stamping part drilling, and is used for drilling and supporting the anti-collision beam workpiece with an arc and a rectangular cross-section cavity, and comprises a machine tool for supporting the horizontally placed workpiece, an outer clamp mechanism for clamping the workpiece, a drilling mechanism driven by a first mechanical arm and used for drilling the workpiece, and an inner support assembly driven by a second mechanical arm and used for extending into the inside of the end of the workpiece. The inner support assembly comprises a flexible feeding rod, an inner support unit and a damping unit. The advantage is that: the flexible feeding is used to realize the accurate positioning of the inner support unit in the arc cavity, and the local rigid support at the drilling position is combined with the synergistic effect of the inflatable flexible damping, so that the problems of the collapse and vibration instability of the drilling position caused by the lack of targeted inner support during the drilling of the arc-shaped thin-walled anti-collision beam are effectively solved, and the drilling precision, the hole wall quality and the stability of the machining process are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of drilling technology for automotive stamping parts, and more particularly to an automatic drilling device for automotive stamping parts. Background Technology

[0002] With the automotive industry's increasing demands for lightweighting and safety performance, anti-collision beams, as key structural components in the automotive passive safety system, directly affect the vehicle's collision safety performance through their manufacturing precision and quality. Currently, anti-collision beams are mostly made of high-strength steel or aluminum alloy, and are stamped into thin-walled structural components with curved main beams and semi-enclosed cavities.

[0003] During the manufacturing process of crash beams, multiple holes are typically machined on the main beam for mounting accessories such as trailer hitches, sensors, and wiring harness mounting brackets, or as process positioning holes for subsequent processes such as painting and welding. These holes require high machining precision; deviations in hole diameter and the quality of the hole openings directly affect the reliability of subsequent assembly and the service life of the crash beam assembly.

[0004] However, due to the long, narrow arc shape and thin-walled nature of the main beam of the crash barrier, drilling it presents unique challenges. Firstly, conventional drilling equipment can only clamp and position the workpiece from the outside, failing to provide effective rigid support within the drilling location. This results in downward pressure from the drill bit causing indentation and deformation at the thin-walled drilling site, severely impacting hole accuracy and appearance quality. Secondly, the high-frequency vibrations generated during drilling further deteriorate the surface quality of the hole wall, leading to increased roughness and burrs at the hole opening. Previous studies have attempted to insert simple support beams into the workpiece for support, but due to the curvature of the crash barrier's internal cavity, the rigid support beams cannot smoothly penetrate to the deep drilling location, and their fixed support position prevents targeted support for different drilling locations, thus limiting their effectiveness.

[0005] Therefore, there is an urgent need for an automatic drilling device for automotive stamping parts that can flexibly travel along the arc-shaped cavity of the anti-collision beam, provide local rigid support at the predetermined drilling position, and effectively suppress vibration, in order to solve the shortcomings of the existing technology. Summary of the Invention

[0006] The purpose of this invention is to solve the problems existing in the prior art and to propose an automatic drilling device for automotive stamping parts.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an automatic drilling equipment for automotive stamping parts, used for drilling and supporting anti-collision beam workpieces with arcuate shape and rectangular cross-section, comprising: a machine tool for supporting the horizontally placed workpiece.

[0008] An external clamping mechanism is installed on the machine tool and is used to clamp the front and rear side walls of the workpiece.

[0009] The drilling mechanism, driven by the first robotic arm, is used to drill holes in the workpiece.

[0010] An inner support assembly, driven by a second robotic arm, is used to extend into the interior of the workpiece from its end.

[0011] The internal support assembly includes a flexible feed rod, an internal support unit, and a shock absorption unit.

[0012] The feed end of the flexible feed rod is fixedly connected to the inner support unit. The second robotic arm grasps the non-feed end of the flexible feed rod to drive the inner support unit to move along the length of the workpiece. The inner support unit moves inside the workpiece to the drilling position and provides local rigid support.

[0013] The damping unit is mounted on the flexible feed rod, and the outer peripheral wall of the flexible feed rod is made to fit against the inner wall of the workpiece by inflating.

[0014] In the aforementioned automatic drilling equipment for automotive stamping parts, the flexible feed rod includes a steel cable and a flexible rubber sheath covering the outside of the steel cable.

[0015] In the aforementioned automatic drilling equipment for automotive stamping parts, the inner support unit includes a mounting base and a traveling component and an inner support component disposed on the mounting base; the mounting base is fixedly connected to the feed end of the flexible feed rod.

[0016] In the aforementioned automatic drilling equipment for automotive stamping parts, the traveling assembly includes a slide block one slidably connected to the upper and lower outer walls of the mounting base, and a slide block two slidably connected to the front and rear outer walls of the mounting base; each slide block one is rotatably connected with a plurality of balls for rolling contact with the planar part of the inner wall of the workpiece.

[0017] In the aforementioned automatic drilling equipment for automotive stamping parts, each slide is connected to a floating plate via an elastic element, and several balls are rotatably connected to the floating plate for rolling contact with the arc-shaped part of the inner wall of the workpiece.

[0018] In the aforementioned automatic drilling equipment for automotive stamping parts, the inner support assembly includes support frames arranged symmetrically in the upper and lower parts. Both support frames are elastically slidably connected to the side of the mounting base away from the steel cable in the vertical direction. Each support frame is fixedly provided with a wedge block, and the wedge surfaces of the two wedge blocks are arranged opposite each other.

[0019] In the aforementioned automatic drilling equipment for automotive stamping parts, a pusher is also slidably connected to the mounting base along its axial direction. The pusher is located between two support frames, and the upper and lower side walls of the pusher are respectively adapted to the wedge surfaces of the two wedge blocks.

[0020] In the aforementioned automatic drilling equipment for automotive stamping parts, the pusher has an extended position and a retracted position. In the extended position, the pusher pushes the two support frames away from each other so that the two support frames abut against the upper and lower inner walls of the workpiece respectively. In the retracted position, the two support frames elastically reset and move closer to each other to avoid the inner wall of the workpiece.

[0021] In the aforementioned automatic drilling equipment for automotive stamping parts, the shock absorption unit includes several shock absorption airbags uniformly embedded in the flexible rubber sheath along the circumference. The air intake port of the shock absorption airbag passes through the non-feed end of the flexible rubber sheath and is used to connect to an external air source.

[0022] In the aforementioned automatic drilling equipment for automotive stamping parts, an air blowing assembly is also provided on the mounting base. The air blowing assembly is used to blow out the chips inside the workpiece during the movement of the mounting base. The air blowing assembly includes an air supply pipe. The mounting base and the flexible rubber sleeve are both provided with channels for the air supply pipe to pass through. One end of the air supply pipe is connected to an external air source, and the other end is connected to an air outlet opened on the mounting base.

[0023] Compared with existing technologies, the advantages of this invention are: 1. By using flexible feeding to achieve precise positioning of the internal support unit in the arc-shaped cavity, and combining the synergistic effect of local rigid support at the drilling position and inflatable flexible shock absorption, the problem of drilling position collapse and vibration instability caused by lack of targeted internal support during drilling of arc-shaped thin-walled anti-collision beams is effectively solved, significantly improving drilling accuracy, hole wall quality and processing stability.

[0024] 2. This solution utilizes the flexible bending characteristics of the flexible feed rod, enabling the inner support unit to smoothly traverse the workpiece's arc-shaped cavity to any predetermined drilling position. Once in position, the upper and lower support frames move away from each other and abut against the upper and lower inner walls of the workpiece, forming localized rigid support at the drilling position. This directly resists the downward pressure of the drill bit, effectively reducing downward concavity at the drilling location of thin-walled parts, significantly improving drilling accuracy and appearance quality. It overcomes the shortcomings of traditional external clamping or simple support beams, which cannot provide targeted support for drilling positions deep within arc-shaped areas.

[0025] 3. This solution provides rigid support while the shock-absorbing airbags mounted on the flexible feed rod inflate before drilling, causing the outer peripheral wall of the flexible rubber sleeve to conform to the inner wall of the workpiece. The compressibility of the gas absorbs and suppresses high-frequency vibrations generated during drilling. The synergistic effect of rigid support and flexible shock absorption reduces the problem of collapse at the drilling site and suppresses issues such as rough hole walls and out-of-tolerance hole diameters caused by vibration, significantly improving the stability and consistency of drilling quality. Attached Figure Description

[0026] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the overall structure; Figure 2 A schematic diagram of the overall structure and a partial cross-section of the workpiece; Figure 3 This is a schematic diagram of the workpiece structure; Figure 4 for Figure 2 Enlarged structural diagram at point A; Figure 5 for Figure 2 Enlarged structural diagram at point B; Figure 6 This is a structural schematic diagram of the internal support unit; Figure 7 This is a structural decomposition diagram of the internal support unit; Figure 8 This is a schematic diagram of the structure of the shock-absorbing airbag before it inflates. Figure 9 This is a schematic diagram of the structure of the shock-absorbing airbag after it has expanded.

[0027] In the diagram: 100, workpiece; 1, machine tool; 2, external clamping mechanism; 3, drilling mechanism; 4, flexible feed rod; 41, steel cable; 42, flexible rubber sheath; 5, internal support unit; 51, mounting base; 52, traveling assembly; 521, slide one; 522, slide two; 523, ball bearing; 524, floating plate; 53, internal support assembly; 531, support frame; 532, wedge block; 533, pushing component; 6, shock absorption unit; 61, shock absorption airbag. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Reference Figures 1 to 5 An automatic drilling machine for automotive stamping parts is used to drill and support a crash beam workpiece 100 with an arc and a rectangular cross-section. The automatic drilling machine for automotive stamping parts includes a machine tool 1, an external clamping mechanism 2, a drilling mechanism 3, and an internal support assembly.

[0030] Machine tool 1 is used to support a horizontally placed workpiece 100. The upper surface of machine tool 1 is a flat support plane on which workpiece 100 rests. The support plane of machine tool 1 avoids the position on workpiece 100 to be drilled, so as to avoid interference with the drilling operation.

[0031] The external clamping mechanism 2 is mounted on the machine tool 1 and is used to clamp the front and rear side walls (non-drilled walls) of the workpiece 100. The external clamping mechanism 2 includes clamping arms respectively disposed on the front and rear sides of the machine tool 1. The clamping ends of the clamping arms are provided with elastic pads (not shown in the figure) to prevent indentation or damage to the surface of the workpiece 100 during clamping. The clamping arms are pneumatically or hydraulically driven to realize the clamping and releasing operations of the workpiece 100.

[0032] The drilling mechanism 3 is driven by the first robotic arm (existing mature technology, not shown in the figure) and is used to drill holes in the workpiece 100. The drilling mechanism 3 includes an electric spindle and a drill bit mounted on the electric spindle. The electric spindle is driven by the first robotic arm to move to a predetermined drilling position on the workpiece 100, and the high-speed rotation of the electric spindle drives the drill bit to move from top to bottom to complete the drilling operation.

[0033] The inner support assembly is driven by a second robotic arm (existing mature technology, not shown in the figure) to extend into the interior of the workpiece 100 from its end. The inner support assembly includes a flexible feed rod 4, an inner support unit 5, and a shock absorption unit 6.

[0034] It should be noted that both the first and second robotic arms are conventional industrial robots in this field, and their specific structures and working principles are existing technologies, which will not be elaborated upon in this article.

[0035] The feed end of the flexible feed rod 4 is fixedly connected to the inner support unit 5. The second robotic arm grasps the non-feed end of the flexible feed rod 4 to drive the inner support unit 5 to move along the length of the workpiece 100. Because the flexible feed rod 4 is flexible, it can conform to the curvature of the internal cavity of the workpiece 100, allowing the inner support unit 5 to smoothly pass through the curved cavity to the predetermined drilling position. The inner support unit 5 moves inside the workpiece 100 to the drilling position and provides local rigid support. The damping unit 6 is disposed on the flexible feed rod 4. Through inflation, it causes a portion of the outer peripheral wall of the flexible feed rod 4 to adhere to the inner wall of the workpiece 100, thereby absorbing and suppressing high-frequency vibrations generated during drilling.

[0036] During the drilling operation, the drilling sequence is to drill holes one by one from one end of the workpiece 100 to the other. The inner support unit 5 gradually penetrates into the workpiece 100 as the flexible feed rod 4 is fed in. After the support and drilling of each drilling position are completed, the inner support unit 5 moves to the next drilling position under the drive of the flexible feed rod 4.

[0037] Reference Figure 2 , Figure 4 and Figure 5The flexible feed rod 4 includes a steel cable 41 and a flexible rubber sheath 42 covering the outside of the steel cable 41. The steel cable 41 is made of multiple strands of steel wire twisted together, possessing sufficient tensile strength and flexibility to withstand traction when the inner support unit 5 moves, while also conforming to the curvature of the internal cavity of the workpiece 100. The flexible rubber sheath 42 tightly covers the outside of the steel cable 41, serving two purposes: firstly, protecting the steel cable 41 and preventing direct contact between the steel cable 41 and the inner wall of the workpiece 100; and secondly, providing a carrier for the installation of the vibration damping unit 6.

[0038] It should be noted that the design safety factor of steel cable 41 should not be less than 5 times the rated working load, and non-destructive testing should be carried out on steel cable 41 periodically during equipment use (e.g., every 1000 pieces processed).

[0039] Reference Figures 4 to 7 The inner support unit 5 includes a mounting base 51 and a traveling assembly 52 and an inner support assembly 53 disposed on the mounting base 51. The mounting base 51 is fixedly connected to the feed end of the steel cable 41. The mounting base 51 is generally rectangular, and its external dimensions are slightly smaller than the cross-sectional dimensions of the internal cavity of the workpiece 100, so as to facilitate free movement inside the workpiece 100.

[0040] The traveling assembly 52 guides the movement of the mounting base 51 within the internal cavity of the workpiece 100 and reduces frictional resistance during movement. The traveling assembly 52 includes a first slide block 521 slidably connected vertically to the upper and lower outer walls of the mounting base 51, and a second slide block 522 slidably connected front-to-back to the front and rear outer walls of the mounting base 51. Each slide block 521 is rotatably connected to a plurality of balls 523 for rolling contact with the planar portion of the inner wall of the workpiece 100. Each slide block 522 is connected to a floating plate 524 via an elastic element (preferably a spring, not shown in the figure), and the floating plate 524 is rotatably connected to a plurality of balls 523 for rolling contact with the arcuate portion of the inner wall of the workpiece 100.

[0041] It should be noted that the relative sliding of slides 521 and 522 with the mounting base 51 is driven by a small electric slider (not shown in the figure) to adjust before insertion according to the rectangular cavity size of different workpieces 100: slide 521 is adjusted in the vertical direction; slide 522 is adjusted in the front-to-back direction. A dustproof sealing structure, such as a labyrinth seal or rubber sealing strip, should also be provided on the sliding mating surfaces of slides 521 and 522 with the mounting base 51. Since the front and rear inner walls of the workpiece 100 are curved (corresponding to the curvature of the main beam of the anti-collision beam), the floating plate 524, through the elastic expansion and contraction of the elastic element, can adaptively conform to the curved inner wall, ensuring that the ball bearings 523 always maintain rolling contact with the curved inner wall.

[0042] The inner support assembly 53 includes two support frames 531 arranged symmetrically in the upper and lower parts. Both support frames 531 are elastically (preferably springs, not shown in the figure) slidably connected to the side of the mounting base 51 away from the steel cable 41 in the vertical direction. In the natural state, the two support frames 531 are brought closer to each other under the elastic force of the spring and are in a retracted state to avoid interference with the inner wall of the workpiece 100.

[0043] Each support frame 531 is fixedly provided with a wedge block 532, and the wedge surfaces of the two wedge blocks 532 are arranged opposite each other. The wedge surface of the wedge block 532 forms a certain angle with the horizontal direction, which is preferably 30° to 60°.

[0044] A pusher 533 is slidably connected to the mounting base 51 along its axial direction (left-right direction). The pusher 533 is located between the two support frames 531, and its upper and lower side walls are respectively adapted to the wedge-shaped surfaces of the two wedge blocks 532. The upper and lower side walls of the pusher 533 are inclined surfaces that match the inclination angle of the wedge-shaped surfaces of the wedge blocks 532. The pusher 533 is driven by an independent drive mechanism (preferably a miniature cylinder or hydraulic cylinder, not shown in the figure) to realize the reciprocating sliding of the pusher 533 along the mounting base 51.

[0045] The pusher 533 has an extended position and a retracted position. In the extended position, the pusher 533 slides towards the mounting base 51. The upper and lower inclined surfaces of the pusher 533 push against the wedge surfaces of the two wedge blocks 532, generating a component force perpendicular to the inclined surfaces. This pushes the two support frames 531 away from each other, compressing the spring until the two support frames 531 abut against the upper and lower inner walls of the workpiece 100, achieving localized rigid support for the drilling position. At this time, the distance between the two support frames 531 is fixed, and a rigid contact is formed between the support frames 531 and the inner wall of the workpiece 100, effectively resisting the downward pressure of the drill bit during drilling and reducing the possibility of collapse at the drilling position. The middle of the two support frames 531 has a relief groove corresponding to the drilling position to ensure that the drill bit can completely penetrate the workpiece 100.

[0046] In the retracted position, the pusher 533 slides away from the support frame 531, releasing the push on the wedge block 532. The two support frames 531 move closer to each other under the elastic restoring force of the spring to avoid the inner wall of the workpiece 100, so that the inner support unit 5 can move to the next drilling position inside the workpiece 100.

[0047] It should be noted that the support surface of the support frame 531 that abuts against the inner wall of the workpiece 100 is provided with an anti-slip layer (not shown in the figure). The anti-slip layer can be a rubber pad layer, a knurled layer, or a surface sprayed with a wear-resistant coating, which is used to increase the friction between the support frame 531 and the inner wall of the workpiece 100 and prevent the support frame 531 from sliding relative to the workpiece 100 during the drilling process.

[0048] It should be noted that by simply measuring the feed stroke of the second robotic arm or the length of the cable 41, it is impossible to accurately determine the actual position of the inner support unit 5 inside the workpiece 100. Therefore, referring to the positioning method of the micro-tube mobile robot, a distance sensor is set on the support frame 531 to emit a distance signal along the direction of the workpiece 100 toward the end opening. The current position is determined by measuring the distance to the end reference target.

[0049] Reference Figure 2 , Figure 5 , Figure 8 and Figure 9 The shock-absorbing unit 6 includes several shock-absorbing airbags 61 evenly embedded circumferentially inside the flexible rubber sleeve 42. The air inlet port of the shock-absorbing airbag 61 passes through the non-inlet end of the flexible rubber sleeve 42 and is used to connect to an external air source. The external air source can be an air pump, compressed air station, or other air supply equipment.

[0050] Preferably, there are no fewer than four shock-absorbing airbags 61, which are evenly distributed around the circumference of the flexible rubber sleeve 42. Each shock-absorbing airbag 61 is a strip-shaped structure extending along the length of the flexible feed rod 4, and its length is not less than 1 / 2 of the length of the flexible feed rod 4, so as to ensure that sufficient shock-absorbing support length can be provided near the drilling position.

[0051] After the inner support unit 5 moves to the predetermined drilling position, the external air source injects compressed air into the shock-absorbing airbag 61. The shock-absorbing airbag 61 expands, pushing the outer peripheral wall of the flexible rubber sleeve 42 outward, so that it adheres to the inner wall of the workpiece 100. Due to the compressibility of gas, the flexible rubber sleeve 42, which adheres to the inner wall of the workpiece 100, can absorb and suppress the high-frequency vibrations generated during drilling, improving drilling quality and hole wall smoothness. After drilling is completed, the external air source releases the gas in the shock-absorbing airbag 61, the shock-absorbing airbag 61 contracts, and the outer peripheral wall of the flexible rubber sleeve 42 disengages from the inner wall of the workpiece 100, facilitating the movement of the inner support unit 5 to the next drilling position.

[0052] It should be noted that the outer peripheral wall of the flexible rubber sleeve 42 has raised friction textures at the position corresponding to the shock-absorbing airbag 61 to increase the friction and shock absorption effect when it is in contact with the inner wall of the workpiece 100. The working air pressure of the shock-absorbing airbag 61 should be controlled below the safety threshold. A pressure reducing valve and a safety valve should be connected in series in the air supply circuit to ensure automatic pressure relief in case of abnormal pressure. At the same time, the control unit should be equipped with a real-time air pressure monitoring sensor. When the air pressure exceeds the set range, the machine should immediately stop, alarm, and automatically vent air.

[0053] The mounting base 51 is also equipped with an air blowing assembly (not shown in the figure), which is used to blow out the chips inside the workpiece 100 during the movement of the mounting base 51. The air blowing assembly includes an air supply pipe. Both the mounting base 51 and the flexible rubber sleeve 42 have channels for the air supply pipe to pass through. One end of the air supply pipe is connected to an external air source, and the other end is connected to the air outlet of the air blowing assembly. The mounting base 51 has an air outlet. During the movement, the air blowing assembly works continuously, blowing the chips generated at the drilled position out of the end opening of the workpiece 100, keeping the inside of the workpiece 100 clean.

[0054] Preferably, the gas delivery pipe is a flexible gas delivery pipe made of polyurethane or nylon, which has good flexibility and wear resistance, and can bend together with the flexible feed rod 4 without affecting its flexible feed performance.

[0055] The working process of the automatic drilling equipment for automotive stamping parts according to the present invention is as follows: First, the anti-collision beam workpiece 100 is placed horizontally on the machine tool 1, with the length direction of the workpiece 100 arranged along the left-right orientation of the machine tool 1, the drilling direction being up-down, and the arc-shaped part of the workpiece 100 located in the front-back direction. The external clamping mechanism 2 is activated, and the clamping arms clamp the workpiece 100 from both the front and rear sides, fixing the workpiece 100 on the machine tool 1.

[0056] Secondly, the second robotic arm grasps the non-feed end of the flexible feed rod 4 and drives the inner support assembly to extend into the workpiece 100 from one end opening, causing the inner support unit 5 to move along the length of the workpiece 100 to the first predetermined drilling position. During the movement, the ball bearings 523 on the first slide 521 of the walking assembly 52 roll into contact with the upper and lower planes of the inner wall of the workpiece 100, and the ball bearings 523 on the second slide 522 roll into contact with the front and rear arc surfaces of the inner wall of the workpiece 100 through the elastic adaptive adjustment of the floating plate 524, ensuring that the inner support unit 5 moves smoothly inside the workpiece 100.

[0057] Then, the pusher 533 slides toward the support frame 531, and the upper and lower inclined surfaces of the pusher 533 push the wedge surfaces of the two wedge blocks 532 respectively, pushing the two support frames 531 away from each other until the two support frames 531 abut against the upper and lower inner walls of the workpiece 100 respectively, so as to achieve local rigid support for the drilling position.

[0058] Next, an external air source fills the shock-absorbing airbag 61 with compressed air. The shock-absorbing airbag 61 expands, supporting the outer peripheral wall of the flexible rubber sleeve 42 and adhering it to the inner wall of the workpiece 100.

[0059] Subsequently, the first robotic arm drives the drilling mechanism 3 to move to the predetermined drilling position above the workpiece 100. The electric spindle of the drilling mechanism 3 drives the drill bit to rotate at high speed and feed downwards to complete the drilling operation. During the drilling process, two support frames 531 provide rigid support to resist the downward pressure of the drill bit and reduce the possibility of collapse at the drilling site; the shock-absorbing airbag 61 absorbs the high-frequency vibration generated by drilling through gas damping, ensuring the drilling quality and the smoothness of the hole wall.

[0060] After drilling is completed, the drilling mechanism 3 resets, and the external air source releases the gas in the shock-absorbing airbag 61. The shock-absorbing airbag 61 contracts, and the outer peripheral wall of the flexible rubber sleeve 42 disengages from the inner wall of the workpiece 100. The pusher 533 slides away from the support frame 531, and the two support frames 531 move closer to each other under the action of elastic reset force, releasing the inner support state.

[0061] Finally, the second robotic arm continues to drive the flexible feed rod 4 to feed, moving the inner support unit 5 to the next drilling position, repeating the above-mentioned inner support, shock absorption, drilling and resetting actions until all predetermined drilling positions on the workpiece 100 are completed.

[0062] During the movement, the air blowing assembly continues to work, blowing out the chips inside the workpiece 100. After all drilling is completed, the second robotic arm drives the flexible feed rod 4 to pull the inner support unit 5 out of the workpiece 100, and the outer clamping mechanism 2 releases the workpiece 100, removing the machined workpiece 100.

[0063] Currently, due to the narrow, curved cavity and thin-walled nature of the anti-collision beam, existing equipment struggles to provide effective support within the drilling location. Since the accuracy of the hole machining directly affects the vehicle's collision safety performance and subsequent assembly reliability, internal support is crucial. Although this solution adds a flexible feed rod 4, an internal support unit 5, a shock absorption unit 6, and sensor positioning mechanisms compared to existing equipment, all utilize mature materials and processing techniques in this field. Flexible feeding enables the beam to pass through the curved cavity, localized rigid support resists drilling pressure, and airbag shock absorption suppresses high-frequency vibrations. This effectively solves the problems of hole collapse and vibration instability caused by the lack of targeted internal support in existing equipment, significantly improving drilling accuracy and hole wall quality. Simultaneously, the integration of the air blowing assembly enables online chip removal during processing, further improving cleanliness and automation. From a long-term economic perspective, the increased equipment cost compared to existing technologies is negligible.

[0064] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0065] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An automatic drilling equipment for automotive stamping parts, used for drilling and supporting anti-collision beam workpieces with arcuate shape and rectangular cross-section, characterized in that, include: A machine tool for supporting the horizontally placed workpiece; An external clamping mechanism, mounted on the machine tool, is used to clamp the front and rear side walls of the workpiece; The drilling mechanism, driven by the first robotic arm, is used to drill holes in the workpiece in the vertical direction; An inner support assembly, driven by a second robotic arm, is used to extend into the interior of the workpiece from its end; The internal support assembly includes a flexible feed rod, an internal support unit, and a shock absorption unit; The feed end of the flexible feed rod is fixedly connected to the inner support unit. The second robotic arm grasps the non-feed end of the flexible feed rod to drive the inner support unit to move along the length of the workpiece. The inner support unit moves inside the workpiece to the predetermined drilling position and provides local rigid support. The damping unit is mounted on the flexible feed rod. By inflating the flexible feed rod, a portion of its outer peripheral wall is made to adhere to the inner wall of the workpiece for vibration damping.

2. The automatic drilling equipment for automotive stamping parts according to claim 1, characterized in that, The flexible feed rod includes a steel cable and a flexible rubber sheath covering the outside of the steel cable.

3. The automatic drilling equipment for automotive stamping parts according to claim 1, characterized in that, The inner support unit includes a mounting base and a traveling component and an inner support component disposed on the mounting base; the mounting base is fixedly connected to the feed end of the flexible feed rod.

4. The automatic drilling equipment for automotive stamping parts according to claim 3, characterized in that, The walking assembly includes a first slide block slidably connected to the upper and lower outer walls of the mounting base, and a second slide block slidably connected to the front and rear outer walls of the mounting base; each slide block slidably connected to a plurality of balls for rolling contact with the planar part of the inner wall of the workpiece.

5. The automatic drilling equipment for automotive stamping parts according to claim 4, characterized in that, Each of the slide blocks is connected to a floating plate via an elastic element, and several ball bearings are rotatably connected to the floating plate for rolling contact with the arc-shaped part of the inner wall of the workpiece.

6. The automatic drilling equipment for automotive stamping parts according to claim 3, characterized in that, The inner support assembly includes support frames arranged symmetrically in the upper and lower parts. Both support frames are elastically slidably connected to the side of the mounting base away from the steel cable in the vertical direction. Each support frame is fixedly provided with a wedge block, and the wedge surfaces of the two wedge blocks are arranged opposite each other.

7. The automatic drilling equipment for automotive stamping parts according to claim 6, characterized in that, The mounting base is also slidably connected to a pusher along its axial direction. The pusher is located between two support frames, and the upper and lower side walls of the pusher are respectively adapted to the wedge surfaces of the two wedge blocks.

8. The automatic drilling equipment for automotive stamping parts according to claim 7, characterized in that, The pusher has an extended position and a retracted position; in the extended position, the pusher pushes the two support frames away from each other so that the two support frames abut against the upper and lower inner walls of the workpiece respectively; in the retracted position, the two support frames elastically reset and move closer to each other to avoid the inner wall of the workpiece.

9. An automatic drilling device for automotive stamping parts according to claim 2, characterized in that, The shock absorption unit includes several shock absorption airbags uniformly embedded in the flexible rubber sheath along the circumference. The air inlet of the shock absorption airbag passes through the non-feed end of the flexible rubber sheath and is used to connect to an external air source.

10. An automatic drilling device for automotive stamping parts according to claim 3, characterized in that, The mounting base is also equipped with an air blowing assembly, which is used to blow out the chips inside the workpiece during the movement of the mounting base. The air blowing assembly includes an air supply pipe. The mounting base and the flexible rubber sleeve are both provided with channels for the air supply pipe to pass through. One end of the air supply pipe is connected to an external air source, and the other end is connected to an air outlet opened on the mounting base.

Images