Automatic conveying method for numerical control machining of bars

Abstract

The application discloses a kind of automatic conveying methods of numerical control processing bar, comprising the following steps: bar is sequentially conveyed through automatic conveyor, storage device, lifting feeding mechanism, material guiding device, whole material device to bar.In the present application, the axis position of the bar is not easily changed by the whole material device, and the bar can be more reliably conveyed, wherein the whole material device includes a rotating shaft, a baffle disposed on the rotating shaft, and a torsion spring disposed between the material guiding device and the rotating shaft. The rotating shaft is mounted on the material guiding device, and the baffle extends downward along the radial direction of the rotating shaft.

Description

Technical Field

[0001] This invention relates to the field of CNC machining, and in particular to an automatic feeding method for CNC machining bar stock. Background Technology

[0002] CNC machining is currently considered a high-precision machining method. CNC machining mainly uses CNC machine tools to process workpieces, including CNC lathes, CNC milling machines, CNC machining centers, etc.

[0003] Traditional CNC machining often relies on manual loading and unloading of workpieces. This method is inefficient and lacks precision. Therefore, automated robotic arms have emerged to handle workpiece installation and removal. For example, Chinese patent application number 202022397997.2, filed on October 26, 2020, and published on May 28, 2021, discloses an automatic loading device for CNC lathes, belonging to the field of automatic loading technology. This automatic loading device for CNC lathes includes a frame body, a top-loading assembly, and a clamping assembly. The clamping assembly includes a lifting bracket, a guide rail, a sliding seat, a second hydraulic cylinder, a third hydraulic cylinder, a fourth hydraulic cylinder, and a robotic arm. The second, third, and fourth hydraulic cylinders are activated, allowing the robotic arm to move above the support block. The robotic arm then grips the shaft blank and places it in the CNC lathe's clamping area. Another robotic arm clamps the previously machined finished shaft in the finished product placement area. The automated top-loading design facilitates the stacking of shaft blanks, while the automated clamping design allows for easy loading and unloading of multiple finished shafts without manual intervention. This significantly improves the processing efficiency of the CNC lathe and enhances its clamping and machining accuracy. The top-feeding assembly includes a top-feeding bracket, a support block, a feeding box, a top-feeding plate, and a first hydraulic cylinder. The bottom of the top-feeding bracket is vertically fixed to one side of the top of the machine frame. The support block is symmetrically arranged on the outer side of the upper end of the top-feeding bracket. The feeding box is inclined upward and arranged on the side wall of the top-feeding bracket away from the support block. The top-feeding plate slides vertically between the top-feeding brackets. The cylinder body of the first hydraulic cylinder is vertically arranged on the outer side of the top-feeding bracket below the feeding box. The bottom of the top-feeding plate is fixed to the outer side of the piston rod of the first hydraulic cylinder. During operation, under the action of the first hydraulic cylinder, the top-feeding plate lifts the shaft blank between the feeding box and the support plate, rolls it over the upper end of the support plate into the V-groove of the support block, and then clamps the shaft blank into the CNC lathe by the clamping assembly.

[0004] Although the above-mentioned automatic feeding device for CNC lathes can realize the loading and unloading of shaft-type workpieces, when the top plate lifts the shaft-type blank over the support plate, due to its own weight and the effect of the support plate, the shaft-type blank may deviate from its original axis direction during the process of entering the V-groove, making it difficult for the shaft-type blank to enter the V-groove and for the clamping assembly to clamp the shaft-type blank. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic feeding method for CNC machining bars, which ensures reliable feeding of bars.

[0006] To achieve the above objectives, an automatic feeding method for CNC machining bar stock includes the following steps: S1 conveys the bars to the storage device via an automatic conveyor. The bottom surface of the storage device is inclined downward from the input end to the output end. The bars are arranged sequentially from the output end to the input end of the bottom surface of the storage device under their own weight.

[0007] S2 uses a lifting and feeding mechanism to lift the bars in the storage device one by one into the guiding device. The bottom surface of the guiding device is inclined downward from the input end to the output end.

[0008] S3 After being shaped by a material straightening device at the output end of the guiding device, the material is conveyed to the positioning device; the material straightening device includes a rotating shaft, a baffle plate disposed on the rotating shaft, and a torsion spring disposed between the guiding device and the rotating shaft. The rotating shaft is rotatably mounted on the guiding device, and the baffle plate extends downward from the rotating shaft along the radial direction of the rotating shaft; specifically including: When the first bar rolls along the bottom surface of the guide device to the baffle, the baffle blocks the first bar under the action of the torsion spring. When the second bar is lifted and blocked by the first bar, the baffle opens against the torsion force of the torsion spring under the action of the first and second bars, allowing the first bar to fall into the positioning device.

[0009] After the first bar falls, the baffle returns to its original position under the action of the torsion spring.

[0010] S33 Repeat S31 and S32 above to achieve the positioning and continuous conveying of the bar stock.

[0011] In this context, the weight of the bar is set to G, and the angle between the bottom surface of the guiding device and the horizontal plane is set to... Then the load N exerted by each bar on the baffle is N = G × sin Set the baffle to swing After the angle is adjusted, the bar stock can fall from the guiding device into the positioning device. A positive integer, where M is the load applied to the baffle to open it. Angle, where 1.5N≤M≤2N, according to K=(E*d 4 ) / (1167*D m *P*N*R) determines the wire diameter d of the torsion spring, where, K represents the load (kgf / mm) for each additional 1° of torsion angle when the torsion spring is twisted. , d is the wire diameter of the torsion spring, D m Where is the mean diameter of the torsion spring, N is the total number of coils of the torsion spring, R is the lever arm of the load, p = 3.1416, D m N and R are all set values.

[0012] The above method ensures that the bottom surface of the storage device slopes downwards from the input end to the output end, allowing the bar stock to reliably reach the output end after entering the storage device. The inclusion of a lifting and feeding mechanism prevents the bar stock from directly entering the guiding device when it is not feeding the guiding device. Furthermore, the combined action of the lifting and feeding mechanism and the guiding device helps to prevent the bar stock from slipping out of the storage device. In this invention, due to the inclusion of a material straightening device, when the bar stock enters the straightening device via the guiding device, the torsion spring prevents the first bar stock from pushing open the baffle. The baffle keeps the bar stock's axis in place during transport. When the second bar stock contacts the first, it overcomes the torsion spring's force to push open the baffle, allowing the first bar stock to be transported. Then, the baffle returns to its original position under the action of the torsion spring, blocking and positioning the next bar stock. This process is repeated, ensuring reliable and accurate transport of incoming bar stock. Furthermore, the torsion spring prevents the first bar stock from pushing open the baffle, while the second bar stock pushes it open, allowing the first bar stock to be transported.

[0013] Furthermore, the automatic conveyor includes a support leg assembly, side baffles, conveyor rollers, and a conveyor drive; the support leg assembly includes support legs, adjusting legs, diagonal braces, and connecting seats; each support leg assembly is provided with two parallel and vertically extending support legs, an adjusting leg is threaded to the lower end of the support leg, two diagonal braces are connected between the two support legs, and a connecting seat is bolted to the upper end of the support leg.

[0014] Furthermore, the connecting seat includes a side connecting plate and a vertical connecting plate bent outwards from both sides of the side connecting plate. A cut is formed at the lower inner end of both the side and vertical connecting plates, and an angle is formed at the outer upper end of the vertical connecting plate. A receiving groove is formed between the side and vertical connecting plates. The upper end of the support leg extends into the receiving groove, and the support leg is connected to the vertical connecting plate by bolts. When the support leg assembly is installed on the side baffle, the inner side of the side connecting plate contacts the side baffle. Due to the cut, the distance 'a' between the two connecting plates of the same support leg assembly is less than the distance 'b' between the vertical sides of the cut, and the inner side of the support leg is located outside the vertical side of the cut. Therefore, it facilitates the installation of the support leg assembly, and the increased distance between the support legs improves the stability of the support.

[0015] Furthermore, the storage device includes a storage frame and a storage rack. The storage rack includes a storage base plate and storage side plates, with storage side plates installed on both sides of the storage base plate. The storage base plate is mounted on the conveyor frame and is inclined downwards from the input end to the output end. This storage device has a simple structure and low cost.

[0016] Furthermore, a storage adjustment plate parallel to the storage side plate is installed inside the storage rack. A storage adjustment screw is installed on the storage adjustment plate, and a storage adjustment nut that meshes with the storage adjustment screw is rotatably installed on one of the storage side plates. Rotating the storage adjustment nut adjusts the position of the storage adjustment plate. By setting up the storage adjustment plate, the storage space can be adjusted according to the different sizes and lengths of bars to accommodate the storage of different types of bars. The combination of the storage adjustment screw and the storage adjustment nut results in a simple structure.

[0017] Furthermore, the lifting and feeding mechanism includes a lifting and feeding base, a guide seat, a guide rail, a lifting guide plate, a lifting plate, and a lifting drive; guide seats are respectively provided on both sides of the lifting and feeding base, and guide rails are respectively provided on both sides of the lifting plate. The guide rails are slidably mounted on the guide seats, the lifting guide plate is mounted on the lifting and feeding base, and the lifting plate and the lifting guide plate are slidably fitted together. The upper end of the lifting plate forms an inclined surface from the input end to the output end. The lifting drive is located between the lifting and feeding base and the lifting plate; the specific steps of S2 are as follows: The S21 lifting plate moves downward under the action of the lifting drive, so that the input end of the lifting plate is flush with the bottom surface of the storage device. The bar of the storage device enters the upper end of the lifting plate and is blocked by the lifting guide plate.

[0018] S22 drives the lifting plate to rise through the lifting drive, uses the upper part of the lifting plate and the lifting guide plate to limit the bar material, and drives the bar material to rise to the input end of the material guiding device through the lifting plate.

[0019] S23 Repeat S21 and S22 to lift and convey the next bar.

[0020] In the above structure and method, since the upper end of the lifting plate forms an inclined surface, the upper end of the lifting plate and the side of the guiding device form a receiving groove. When the bar enters the receiving groove, the lifting plate can reliably transport the bar upward. When the output end of the inclined surface is equal to or higher than the guiding device, the bar can naturally enter the guiding device.

[0021] Furthermore, the guiding device includes a guiding base, a guiding frame, and a guiding adjusting plate. The guiding base is mounted on the lifting and feeding mechanism. The guiding frame includes a guiding bottom plate and guiding side plates, with guiding side plates on both sides of the guiding bottom plate. A guiding adjusting plate is installed inside the guiding frame, and a guiding adjusting screw is mounted on the guiding adjusting plate. A guiding adjusting nut is rotatably mounted on one of the guiding side plates, engaging with the guiding adjusting screw. The input end of the guiding adjusting plate is inclined outwards. Because of the guiding adjusting plate, it is suitable for conveying bars of different lengths. The outward inclination of the input end of the guiding adjusting plate guides the plates entering the guiding device, ensuring reliable entry of the bars. Attached Figure Description

[0022] Figure 1 This is a 3D view of an automatic conveying system for CNC machining bar stock.

[0023] Figure 2 This is a three-dimensional view of an automated conveying system for CNC machining bars.

[0024] Figure 3 This is a 3D view of an automated conveyor.

[0025] Figure 4 This is a three-dimensional view of the automated conveyor from another perspective.

[0026] Figure 5 This is an exploded view of an automated conveyor.

[0027] Figure 6 This is a 3D view of the connector.

[0028] Figure 7 This is the front view of the connector.

[0029] Figure 8 This is a schematic diagram of the support leg assembly.

[0030] Figure 9 for Figure 5 A magnified view of A in the middle.

[0031] Figure 10 This is a three-dimensional view of the material storage device.

[0032] Figure 11 This is a three-dimensional view of the storage device from another perspective.

[0033] Figure 12 This is a three-dimensional view of the side frame, lifting and feeding mechanism, guiding device, material handling device, positioning device, and unloading device.

[0034] Figure 13 This is a perspective view of the side frame, lifting and feeding mechanism, guiding device, material handling device, positioning device, and unloading device.

[0035] Figure 14 This is a schematic diagram of a side frame and a lifting and feeding mechanism, excluding the lifting guide plate.

[0036] Figure 15 This is an exploded view of the side frame and lifting feeding mechanism, excluding the lifting guide plate.

[0037] Figure 16 This is a schematic diagram of the material guiding device, the material straightening device, and the positioning device.

[0038] Figure 17 This is a schematic diagram showing the forces acting on the positioning device and the rod. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0040] The automatic feeding method for CNC machining bar stock is achieved through an automatic feeding system for CNC machining bar stock. For example... Figure 1 and Figure 2 As shown, the automatic conveying system for CNC machining bars includes an automatic conveyor 1, a storage device 2, a lifting and feeding mechanism 3, a guiding device 4, a straightening device 5, a positioning device 6, and a dropping device 9.

[0041] like Figures 3 to 5 As shown, the automatic conveyor 1 includes a support leg assembly 11, side baffles 12, conveyor rollers 13, and a conveyor drive. The support leg assembly 11 includes support legs 111, adjusting legs 112, diagonal braces 113, and a connecting seat 114. Each support leg assembly 11 has two parallel and vertically extending support legs 111. Adjusting legs 112 are threaded to the lower end of each support leg 111, allowing for easy adjustment of the support leg 111's height. Two diagonal braces 113 are connected between the two support legs 111, forming an X-shape. A connecting seat 114 is bolted to the upper end of each support leg 111. Figure 6 and Figure 7As shown, the connecting seat 114 includes a side connecting plate 1141 and a vertical connecting plate 1142 bent outwards from both sides of the side connecting plate 1141. A cutout 1143 is formed at the lower inner end of the side connecting plate 1141 and the vertical connecting plate 1142, and a chamfer 1145 is formed at the outer upper end of the vertical connecting plate 1142 to reduce interference between the outer upper end of the connecting seat 114 and other parts. A receiving groove 1144 is formed between the side connecting plate 1141 and the vertical connecting plate 1142. The upper end of the support foot 113 extends into the receiving groove 1144, and the support foot 113 is connected to the vertical connecting plate 1142 by bolts. Therefore, the side connecting plate 1141 and the vertical connecting plate 1142 can effectively limit the upper end of the support foot 113. Figure 8 As shown, when the support leg assembly 11 is installed on the side baffle 12, the inner side of the side connecting plate 1141 contacts the side baffle 12. Since the cut 1143 is provided, the distance a between the two connecting plates of the same support leg assembly is less than the distance b between the vertical sides of the cut 1143, and the inner side of the support leg is located outside the vertical side of the cut. Therefore, it is convenient to install the support leg assembly, and the distance between the support legs is increased, which improves the stability of the support.

[0042] Side baffles 12 are mounted on connecting seats 114. Multiple horizontally arranged conveyor rollers 13 are mounted between the two side baffles 12 via bearings. Figure 9 As shown, at least one sprocket 131 is provided at one end of the conveying roller 13.

[0043] The conveying drive includes a servo motor (not shown in the figure), a conveying drive shaft 141, and a conveying drive sprocket 142. The conveying drive shaft 141 is installed between the two side baffles 12, and the conveying drive sprocket 142 is installed on the conveying drive shaft 141. The servo motor drives the conveying drive shaft 141 to rotate. A chain is sleeved between the conveying drive sprocket 142 and the sprocket 131. When the servo motor is working, the conveying roller 13 can be driven to rotate through the conveying drive sprocket 142, the sprocket 131, and the chain, thereby conveying the bars on the automatic conveyor.

[0044] like Figure 1 As shown, a side frame 70 is installed on one side of the output end of the automatic conveyor.

[0045] like Figure 10 and Figure 11As shown, the storage device 2 includes a storage frame 21 and a storage rack 22. The storage frame 21 is mounted on the side frame 70. The storage rack 22 includes a storage base plate 221 and storage side plates 222. Storage side plates 222 are respectively provided on both sides of the storage base plate 221. The storage base plate 221 is set on the conveyor frame 21 and is inclined downward from the input end to the output end. A downwardly bent storage guide plate 223 is provided at the output end of the storage base plate 221. A storage adjustment plate 23 parallel to the storage side plates 222 is provided inside the storage rack 22. A storage adjustment screw 24 is provided on the storage adjustment plate 23. A storage adjustment nut 25 that meshes with the storage adjustment screw is rotatably mounted on one of the storage side plates. Rotating the storage adjustment nut 25 adjusts the position of the storage adjustment plate 23 to accommodate bars of different lengths and sizes.

[0046] like Figures 12 to 15 As shown, the lifting and feeding mechanism 3 includes a lifting and feeding base 31, a guide seat 32, a guide rail 33, a lifting guide plate 34, a lifting plate 35, and a lifting drive 36. The lifting and feeding base 31 is mounted on the side frame 70. The lifting and feeding base 31 has a clearance hole 311, which provides clearance space for the lifting of the lifting plate 35. Guide seats 32 are respectively set on both sides of the lifting and feeding base 31. A guide block 321 is installed on the inner side of the guide seat 32. A guide rail 33 is slidably set on the guide block 321. A guide rail 33 is respectively set on both sides of the lifting plate 35. The lifting guide plate 34 is set on the lifting and feeding base 31 through a connecting device 37. The lifting plate 35 slides and fits against the lifting guide plate 34. The upper end 351 of the lifting plate 35 forms an inclined surface from the input end to the output end. The lifting drive 36 is a lifting hydraulic cylinder. The cylinder body of the lifting hydraulic cylinder is mounted on a CNC lathe. The piston rod of the hydraulic cylinder is connected to the lifting plate 35 through a connecting block 38. When the lifting hydraulic cylinder is working, the lifting hydraulic cylinder drives the lifting plate 35 to move up and down through the connecting block 38. When the lifting plate 35 moves up and down, it slides on the guide block 321 through the guide rail 33 to achieve position guidance.

[0047] In this invention, the storage guide plate 223 and the lifting plate 35 are in sliding contact. When the upper end of the lifting plate 35 is higher than the bar falling into the front end of the storage device, the lifting plate 35 blocks the bar in the storage device. When the bar needs to be conveyed upward, the lifting hydraulic cylinder drives the lifting plate 35 to descend, allowing one of the bars to slide into the upper end of the lifting plate 35. At this time, the lifting guide plate 34 blocks the bar from the side, and then the lifting hydraulic cylinder drives the guide plate 35 to rise, lifting the bar upward. When the output end of the upper end of the lifting plate 35 is equal to or higher than the guiding device 4, the bar will fall into the guiding device 4. In this structure, since the upper end 351 of the lifting plate 35 forms an inclined surface from the input end to the output end, the inclined surface of the lifting plate 35 and the lifting guide plate 34 can limit the bar during the lifting process, preventing the bar from falling off the lifting plate 35.

[0048] like Figure 12 , Figure 13 and Figure 16 As shown, the guiding device 4 includes a guiding base 41, a guiding frame 42, and a guiding adjusting plate 43. The guiding base 41 is mounted on the lifting guide plate 34. The guiding frame 42 includes a guiding bottom plate 421 and guiding side plates 422. Guiding side plates 422 are respectively mounted on both sides of the guiding bottom plate 421. A guiding adjusting plate 43 is mounted inside the guiding frame 42, and a guiding adjusting screw 44 is mounted on the guiding adjusting plate 43. A guiding adjusting nut 45 is rotatably mounted on one of the guiding side plates, engaging with the guiding adjusting screw 44. The input end 431 of the guiding adjusting plate is inclined outwards. When the guiding adjusting nut 45 is rotated, the guiding adjusting screw can move axially, thus moving the guiding adjusting plate 43, making it suitable for bars of different lengths. Because the input end of the guiding adjusting plate 43 is inclined outwards, it can guide the plate material entering the guiding device, allowing the bar material to reliably enter the guiding device.

[0049] like Figure 12 , Figure 13 and Figure 16 As shown, the material straightening device 5 includes a rotating shaft 51, a baffle 52 disposed on the rotating shaft 51, and a torsion spring (not shown) disposed between the guide side plate 422 and / or the guide adjusting plate 43 and the rotating shaft. The rotating shaft 51 is rotatably mounted on the guide device, and the baffle 52 extends downward from the rotating shaft along the radial direction of the rotating shaft. In this embodiment, a material straightening device is disposed on a guide side plate, and a material straightening device is disposed on the guide adjusting plate. The two material straightening devices are on the same plane and work together to straighten the bar stock.

[0050] In this invention, such as Figure 17 As shown, the weight of the bar 100 is set to G, and the angle between the upper bottom surface of the guide plate 421 and the horizontal plane is set to... Then the load N acting on baffle 52 by each bar is N = G × sin Set the baffle to swing After the angle is adjusted, the bar stock can fall from the guiding device into the positioning device. A positive integer, where M is the load applied to the baffle to open it. Angle, where 1.5N≤M≤2N, according to K=(E*d 4 ) / (1167*D m *P*N*R) determines the wire diameter d of the torsion spring, where, K represents the load (kgf / mm) for each additional 1° of torsion angle when the torsion spring is twisted. d is the wire diameter of the torsion spring, D m Where is the mean diameter of the torsion spring, N is the total number of coils of the torsion spring, R is the lever arm of the load, p = 3.1416, D m N and R are both set values. In this embodiment, the wire diameter of the torsion spring in each material handling device 5 is d1 = d / 2. Since the range of M selected is 1.5N ≤ M ≤ 2N, and the resistance to the rotation of the baffle and the shaft is small, this range can meet the requirements of the present invention.

[0051] like Figure 12 , Figure 13 and Figure 16 As shown, the positioning device 6 includes a positioning base 61, a V-block 62, an end face positioning plate 63, a positioning drive seat 64, a positioning drive 65, and a positioning drive rod 66. A positioning base 61 is mounted on a guide base 41. Two or more V-blocks 62 are set on the positioning base 61, arranged side by side with gaps between adjacent V-blocks 62. An end-face positioning plate 63 is set on the positioning base 61 and located at one end of the positioning base. The end-face positioning plate 63 is positioned close to the CNC lathe and is located on one side of the V-blocks close to the CNC lathe. A positioning drive seat 64 is set on the positioning base 61 and located at the other end of the positioning base. The V-blocks 62 are located between the end-face positioning plate 63 and the positioning drive seat 64. The positioning drive 65 is a positioning cylinder and is set on the positioning drive seat 64. The positioning drive rod 66 is set on the output shaft of the positioning drive. The bar falls from the guide device onto the V-block, and then the positioning drive drives the positioning drive rod axis to move, so that one end of the bar abuts against the end-face positioning plate.

[0052] like Figure 1 , Figure 12 and Figure 13As shown, the material feeding device 9 includes a material feeding frame 91, a material feeding chute 92, a material collection frame 93, and a conveyor belt device 94. The material feeding frame 91 is mounted on a side frame, the material feeding chute 92 is mounted on the material feeding frame 91, the material collection frame 93 is located at the output end of the material feeding chute 92, and a conveyor belt device 94 is provided on one side of the side frame. The conveyor belt device 94 is used to convey the material collection frame 92 out. The conveyor belt device 94 is existing technology.

[0053] The automatic feeding method for CNC machining bar stock includes the following steps: S1 conveys the bars to the storage device 2 via the automatic conveyor 1; the bars are arranged sequentially from the output end to the input end of the bottom surface of the storage device under the action of their own gravity.

[0054] S2 uses the lifting and feeding mechanism 3 to lift the bars in the storage device 2 one by one into the guiding device 4. The bottom surface of the guiding device 4 is inclined downward from the input end to the output end. The specific steps are as follows.

[0055] The S21 lifting plate moves downward under the action of the lifting drive, so that the input end of the lifting plate is flush with the bottom surface of the storage device. The bar of the storage device enters the upper end of the lifting plate and is blocked by the lifting guide plate.

[0056] S22 drives the lifting plate to rise through the lifting drive, uses the upper part of the lifting plate and the lifting guide plate to limit the bar material, and drives the bar material to rise to the input end of the material guiding device through the lifting plate.

[0057] S23 Repeat S21 and S22 to lift and convey the next bar.

[0058] S3, after being shaped by a material straightening device at the output end of the feeding device, is conveyed into the positioning device; specifically including: When the first bar rolls along the bottom surface of the guide device to the baffle, the baffle blocks the first bar under the action of the torsion spring. When the second bar is lifted and blocked by the first bar, the baffle opens against the torsion force of the torsion spring under the action of the first and second bars, allowing the first bar to fall into the positioning device.

[0059] After the first bar falls, the baffle returns to its original position under the action of the torsion spring.

[0060] S33 Repeat S31 and S32 above to achieve the positioning and continuous conveying of the bar stock.

[0061] S4 positions the bar in the positioning device.

[0062] S5 uses a robotic arm to clamp the bar stock from the positioning device onto a CNC lathe; the bar stock is then held in place by the chuck and tailstock of the CNC lathe.

[0063] S6 uses a CNC lathe to perform CNC machining on bar stock to form workpieces.

[0064] S9 uses a robotic arm to clamp the workpiece into the discharge chute, and then allows the workpiece to fall into the collection frame through the discharge chute.

[0065] The above method ensures that the bottom surface of the storage device slopes downwards from the input end to the output end, allowing the bar stock to reliably reach the output end after entering the storage device. The inclusion of a lifting and feeding mechanism prevents the bar stock from directly entering the guiding device when it is not feeding the guiding device. Furthermore, the combined action of the lifting and feeding mechanism and the guiding device helps to prevent the bar stock from slipping out of the storage device. In this invention, due to the material straightening device, when the bar enters the straightening device via the guiding device, the torsion spring prevents the first bar from pushing open the baffle. The baffle keeps the bar's axis aligned with the direction of feeding into the positioning device, allowing the bar to reliably fall into the positioning device. When the second bar contacts the first bar, it overcomes the spring force of the torsion spring and pushes open the baffle, allowing the first bar to fall into the positioning device. Then, the baffle resets under the action of the torsion spring, blocking the next bar and straightening and positioning it. This process continues, ensuring that the incoming bars reliably fall into the positioning device, resulting in reliable and accurate bar feeding.

Claims

1. An automatic feeding method for CNC machining bar stock, characterized in that... The steps include the following: S1 conveys the bars to the storage device via an automatic conveyor. The bottom surface of the storage device is inclined downward from the input end to the output end. The bars are arranged sequentially from the output end to the input end of the bottom surface of the storage device under their own weight. S2 uses a lifting and feeding mechanism to lift the bars in the storage device one by one into the guiding device. The bottom surface of the guiding device is inclined downward from the input end to the output end. S3 After being shaped by a material straightening device at the output end of the guiding device, the material is conveyed to the positioning device; the material straightening device includes a rotating shaft, a baffle plate disposed on the rotating shaft, and a torsion spring disposed between the guiding device and the rotating shaft. The rotating shaft is rotatably mounted on the guiding device, and the baffle plate extends downward from the rotating shaft along the radial direction of the rotating shaft; specifically including: S31 When the first bar rolls along the bottom surface of the guide device to the baffle, the baffle blocks the first bar under the action of the torsion spring. When the second bar is lifted and blocked by the first bar, the baffle opens against the torsion force of the torsion spring under the action of the first and second bars, allowing the first bar to fall into the positioning device. After the first bar falls, the baffle returns to its original position under the action of the torsion spring. S33 Repeat S31 and S32 above to achieve the positioning and continuous conveying of the bar stock; In this context, the weight of the bar is set to G, and the angle between the bottom surface of the guiding device and the horizontal plane is set to... Then the load N exerted by each bar on the baffle is N = G × sin Set the baffle to swing After the angle is adjusted, the bar stock can fall from the guiding device into the positioning device. A positive integer, where M is the load applied to the baffle to open it. Angle, where 1.5N≤M≤2N, according to K=(E*d 4 ) / (1167*D m *P*N*R) determines the wire diameter d of the torsion spring, where, K represents the load (kgf / mm) for each additional 1° of torsion angle when the torsion spring is twisted. , d is the wire diameter of the torsion spring, D m Where is the mean diameter of the torsion spring, N is the total number of coils of the torsion spring, R is the lever arm of the load, p = 3.1416, D m N and R are all set values.

2. The automatic feeding method for CNC machining bar stock according to claim 1, characterized in that: The automatic conveyor includes a support leg assembly, side baffles, conveyor rollers, and a conveyor drive; the support leg assembly includes support legs, adjusting legs, diagonal braces, and connecting seats; each support leg assembly is provided with two parallel and vertically extending support legs, an adjusting leg is threaded to the lower end of the support leg, two diagonal braces are connected between the two support legs, and a connecting seat is bolted to the upper end of the support leg.

3. The automatic feeding method for CNC machining bar stock according to claim 2, characterized in that: The connecting seat includes a side connecting plate and a vertical connecting plate that bends outward from both sides of the side connecting plate. A cut is formed at the lower inner end of the side connecting plate and the vertical connecting plate, and an angle is formed at the upper outer end of the vertical connecting plate. A receiving groove is formed between the side connecting plate and the vertical connecting plate. The upper end of the support foot extends into the receiving groove, and the support foot is connected to the vertical connecting plate by bolts.

4. The automatic feeding method for CNC machining bar stock according to claim 1, characterized in that: The storage device includes a storage frame and a storage rack. The storage rack includes a storage base plate and storage side plates. Storage side plates are respectively provided on both sides of the storage base plate. The storage base plate is set on the conveyor frame and is inclined downward from the input end to the output end.

5. The automatic feeding method for CNC machining bar stock according to claim 4, characterized in that: A storage adjustment plate parallel to the storage side plate is installed inside the storage rack. A storage adjustment screw is installed on the storage adjustment plate. A storage adjustment nut that meshes with the storage adjustment screw is rotatably installed on one of the storage side plates. The position of the storage adjustment plate is adjusted by rotating the storage adjustment nut.

6. The automatic feeding method for CNC machining bar stock according to claim 1, characterized in that: The lifting and feeding mechanism includes a lifting and feeding base, guide seats, guide rails, a lifting guide plate, a lifting plate, and a lifting drive. Guide seats are provided on both sides of the lifting and feeding base, and guide rails are provided on both sides of the lifting plate. The guide rails are slidably mounted on the guide seats. The lifting guide plate is mounted on the lifting and feeding base, and the lifting plate slides against the lifting guide plate. The upper end of the lifting plate forms an inclined surface from the input end to the output end. The lifting drive is located between the lifting and feeding base and the lifting plate. The specific steps of S2 are as follows: The S21 lifting plate moves downward under the action of the lifting drive, so that the input end of the lifting plate is flush with the bottom surface of the storage device, and the bar of the storage device enters the upper end of the lifting plate and is blocked by the lifting guide plate. S22 drives the lifting plate to rise through the lifting drive, uses the upper part of the lifting plate and the lifting guide plate to limit the bar, and drives the bar to rise to the input end of the material guiding device through the lifting plate; S23 Repeat S21 and S22 to lift and convey the next bar.

7. The automatic feeding method for CNC machining bar stock according to claim 1, characterized in that: The material guiding device includes a material guiding base, a material guiding frame, and a material guiding adjustment plate. The material guiding base is mounted on the lifting and feeding mechanism. The material guiding frame includes a material guiding bottom plate and material guiding side plates. Material guiding side plates are respectively set on both sides of the material guiding bottom plate. A material guiding adjustment plate is set inside the material guiding frame. A material guiding adjustment screw is set on the material guiding adjustment plate. A material guiding adjustment nut is rotatably set on one of the material guiding side plates. The material guiding adjustment screw meshes with the material guiding adjustment nut. The input end of the material guiding adjustment plate is tilted outward.

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