Workpiece positioning clamping device

Abstract

The present invention provides a workpiece positioning and clamping device for a band saw, comprising an inductive positioning mechanism and a clamping mechanism. The right end face of the workpiece is accurately positioned using a ball screw assembly, the workpiece is clamped in the second direction using a band saw fixture, and the workpiece is pressed in the third direction using a cylinder to drive a pressing rod and a pressing block; after the end face of the workpiece is accurately positioned and clamped, the band saw is started, and the saw blade of the band saw processes the other end of the workpiece. This device is simple to operate, has accurate positioning, fast machine adjustment, and smooth operation. It can avoid problems such as poor manual positioning accuracy and low processing accuracy caused by the workpiece tilting or deflection during processing, and is suitable for batch processing operations of workpieces; the foot nut can adjust the height of the support base, and then adjust the height of the sensing point of the ball screw, which can be used to position the end faces of workpieces with different diameters, ensuring that the sensing point is always located at the center of the end face of the workpiece, improving the sawing accuracy, improving the yield rate, and reducing scrap.

Description

[0001] This case is a divisional application based on the invention patent with application date of November 8, 2021, application number 202111310364.6, and name "A workpiece positioning and clamping device used in a band saw" as the parent case. Technical Field

[0002] The invention relates to the technical field of machining, and in particular to a workpiece positioning and clamping device applied to a band sawing machine. Background Art

[0003] In the field of metal machining, raw material cutting is generally done by a combination of circular saws and band saws. The circular saw cuts the set length through the CNC system, while the band saw reprocesses the workpieces that the circular saw cannot process. However, in addition to the quality of the saw blade itself, there are also some external factors that affect the sawing effect of the band saw, such as the equipment parameter settings during processing and the operator's operating method. The operator's operating method is the biggest uncontrollable factor, and a large number of scraps are generated due to poor operation.

[0004] The current band saw machines are equipped with mechanical positioning devices, which require that the end face of the workpiece to be processed must be against the positioning surface in order to process a workpiece of qualified length. Whether the end face is in place is determined by the subjective judgment of the operator, so there is a certain degree of unreliability in the sawing accuracy. In addition, since two workpieces are processed at the same time, when both sides are clamped, the two workpieces will squeeze toward the middle, the workpiece will arch and warp, resulting in uneven and skewed lengths of the processed workpieces. Summary of the invention

[0005] The purpose of the present invention is to solve the problem of low workpiece processing accuracy caused by poor positioning reliability of human judgment, workpiece warping and other reasons in the prior art band sawing machine processing, and to propose a workpiece positioning and clamping device applied to the band sawing machine to improve the workpiece positioning and processing accuracy, ensure reliability, ensure that the workpiece processing length is consistent and straight, and improve the yield rate.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A workpiece positioning and clamping device used for a band sawing machine comprises an inductive positioning mechanism and a clamping mechanism.

[0008] The induction positioning mechanism includes a supporting base, an axis core, a first slider, a sliding base, a slide rail, a second slider, a positioning base and a ball screw assembly. The axis core is arranged at the top of the supporting base along a first direction, the first slider is movably arranged on the axis core along the first direction, the sliding base is arranged on the first slider, the slide rail is arranged on the sliding base along the first direction, the second slider is movably arranged on the slide rail along the first direction, the positioning base is fixed on the second slider, the ball screw assembly is arranged on the positioning base, and the sensing point of the ball screw assembly faces the workpiece placement area on the band saw table.

[0009] The clamping mechanism is arranged in the workpiece placement area on the band saw table, and the clamping mechanism includes a band saw clamp, an oil cylinder, a pressure rod and a pressure block. The band saw clamp is arranged on the band saw table and is used to clamp the workpiece in the second direction. The oil cylinder is arranged above the band saw clamp along the third direction, and the pressure rod is arranged along the third direction. The upper end of the pressure rod is connected to the output end of the oil cylinder, and the lower end of the pressure rod is connected to the pressure block.

[0010] Preferably, the induction positioning mechanism also includes a first positioning plate, a second positioning plate, a tooth bar, a first locking nut and a second locking nut. The first positioning plate is connected to the end of the sliding base, and the second positioning plate is connected to the end of the positioning base. The first positioning plate and the second positioning plate are arranged in parallel. The tooth bar passes through the first positioning plate and the second positioning plate respectively along a first direction. The tooth bar is threadedly matched with the first positioning plate and the second positioning plate. The first locking nut and the second locking nut are sleeved on the tooth bar, and the first locking nut is close to the first positioning plate, and the second locking nut is close to the second positioning plate.

[0011] Preferably, the first positioning plate is integrally connected to the sliding base, or is welded to the sliding base, or is connected via fasteners; the second positioning plate is integrally connected to the positioning base, or is welded to the sliding base, or is connected via fasteners.

[0012] Preferably, the ball screw assembly includes a ball screw, a lead screw and a plastic plate, the plastic plate is arranged on the positioning base, the lead screw is arranged on the plastic plate along the first direction, the ball screw is arranged on the lead screw along the first direction, and the sensing point of the ball screw faces the workpiece placement area on the band saw table.

[0013] Preferably, there are two groups of lead screws, the number of the ball screws is two, the two groups of lead screws are arranged in parallel on the plastic plate, and the two ball screws are arranged side by side on the corresponding lead screws, respectively used for contact sensing positioning of the two workpieces.

[0014] Preferably, the height of the sensing point of the ball screw is consistent with the height of the center axis of the workpiece.

[0015] Preferably, the bottom end of the support base is fixed to the side of the band saw through a height-adjustable stepping nut.

[0016] Preferably, the shaft core is cylindrical and has a smooth surface.

[0017] Preferably, there are two shaft cores, which are arranged in parallel along the first direction, each shaft core is provided with the first sliding block, and the sliding base is fixed on the two first sliding blocks.

[0018] Preferably, a control mechanism is further included, and the ball screw assembly, the band saw clamp, and the oil cylinder are electrically connected to the control mechanism.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: the movement of the first slider on the shaft core drives the sliding base and the upper components to move, thereby realizing the initial adjustment of the positioning position of the ball screw; the movement of the second slider on the slide rail drives the positioning base and the ball screw assembly to move, thereby realizing the fine adjustment of the positioning position of the ball screw; the adjusted positioning position is locked by using the first locking nut and the second locking nut; when the workpiece is placed on the workpiece placement area of ​​the band saw table, the right end face of the workpiece is accurately positioned by using the ball screw, the workpiece is clamped in the second direction by using the band saw fixture, and the workpiece is pressed in the third direction by driving the pressing rod and the pressing block by the oil cylinder; after accurately positioning the end face of the workpiece and clamping the workpiece, the band saw is started, and the saw blade of the band saw processes the left end of the workpiece. This device is easy to operate, has precise positioning, fast adjustment, and smooth operation. It can avoid problems such as poor manual positioning accuracy and low processing accuracy caused by workpiece tilting or deflection during processing, and is suitable for batch processing operations of workpieces. The foot nut can adjust the height of the support base, and then adjust the height of the sensing point of the ball head screw. It can be used to position the end faces of workpieces with different diameters, ensuring that the sensing point is always located in the center of the workpiece end face, thereby improving the sawing accuracy, increasing the yield rate, and reducing scrap. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of the workpiece positioning and clamping device applied to a band sawing machine of the present invention;

[0021] Figure 2 It is an enlarged view of the inductive positioning mechanism in the workpiece positioning and clamping device applied to the band sawing machine of the present invention;

[0022] Figure 3 It is a left side view of the workpiece positioning and clamping device applied to a band sawing machine of the present invention;

[0023] Figure 4It is an enlarged top view of the ball screw assembly of the present invention;

[0024] Figure 5 It is an enlarged view of the main structure of the ball head screw assembly in the present invention.

[0025] In the figure, 100-inductive positioning mechanism, 101-support base, 102-axis core, 103-first slider, 104-sliding base, 105-slide rail, 106-second slider, 107-positioning base, 108-ball screw assembly, 1081-ball screw, 1082-screw, 1083-plastic plate, 109-first positioning plate, 110-second positioning plate, 111-tooth bar, 112-first locking nut, 113-second locking nut, 114-foot nut; 200-clamping mechanism, 201-band saw fixture, 202-oil cylinder, 203-down pressure rod, 204-down pressure block, 301-band saw table, 302-saw blade, 400-workpiece. DETAILED DESCRIPTION

[0026] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed description is given in conjunction with the embodiments.

[0027] Please refer to Figures 1 to 3 , Figure 1 It is a front view of the workpiece positioning and clamping device applied to a band sawing machine of the present invention; Figure 2 It is an enlarged view of the inductive positioning mechanism in the workpiece positioning and clamping device applied to the band sawing machine of the present invention; Figure 3 It is a left side view of the workpiece positioning and clamping device applied to a band sawing machine according to the present invention.

[0028] It should be noted that Figures 1 to 3 From the placement state of the workpiece positioning and clamping device applied to the band sawing machine shown in the figure, the first direction X mentioned below is the left-right direction of the device, the second direction Y is the front-back direction of the device, and the third direction Z is the up-down direction of the device.

[0029] A workpiece positioning and clamping device for a band sawing machine of the present invention comprises an inductive positioning mechanism 100, a clamping mechanism 200 and a control mechanism (not shown in the figure). The control mechanism is electrically connected to the electrical components in the inductive positioning mechanism 100 and the clamping mechanism 200 for electrical control; the inductive positioning mechanism 100 is used to accurately position the right end face of the workpiece in a first direction X to ensure positioning reliability and thus improve sawing accuracy; the clamping mechanism 200 is used to clamp the workpiece in a second direction Y and a third direction Z to prevent the workpiece from arching or warping during sawing and affecting the processing accuracy.

[0030] Please refer to Figures 1 to 3The induction positioning mechanism 100 includes a supporting base 101, an axis core 102, a first slider 103, a sliding base 104, a slide rail 105, a second slider 106, a positioning base 107 and a ball screw assembly 108. The axis core 102 is arranged at the top of the supporting base 101 along the first direction X, and the first slider 103 can be movably arranged on the axis core 102 along the first direction X; wherein the axis core 102 is cylindrical, the surface of the axis core 102 is smooth, and the friction resistance is small, thereby ensuring that the first slider 103 can move quickly and smoothly on the axis core 102, thereby improving the adjustment efficiency. The sliding base 104 is arranged on the first slider 103, the slide rail 105 is arranged on the sliding base 104 along the first direction X, the second slider 106 is movably arranged on the slide rail 105 along the first direction X, the positioning base 107 is fixed on the second slider 106, and the ball screw assembly 108 is arranged on the positioning base 107. The sensing point of the ball screw assembly 108 faces the workpiece placement area on the band saw table 301. The ball screw assembly 108 is electrically connected to the control mechanism for sensing and determining whether the workpiece is placed in place.

[0031] Please refer to Figure 2 , Figure 4 and Figure 5 , Figure 4 It is an enlarged top view of the ball screw assembly of the present invention; Figure 5 This is an enlarged view of the main structure of the ball screw assembly in the present invention. The ball screw assembly 108 includes a ball screw 1081, a lead screw 1082 and a plastic plate 1083. The plastic plate 1083 is arranged on the positioning base 107. The lead screw 1082 is arranged on the plastic plate 1083 along the first direction X. The ball screw 1081 is arranged on the lead screw 1082 along the first direction X. The sensing point of the ball screw 1081 faces the workpiece placement area on the band saw table 301. The lead screw 1082 is electrically connected to the control mechanism through a circuit, and the plastic plate 1083 plays an insulating role. When the right end face of the workpiece 400 does not contact the sensing point of the ball screw 1081, the circuit where the ball screw assembly 108 is located is in an open circuit state, and the band sawing machine equipment cannot be started; when the right end face of the workpiece 400 contacts the sensing point of the ball screw 1081, that is, the workpiece 400 is positioned in place, the circuit where the ball screw assembly 108 is located is connected to form a loop, the control mechanism receives the signal, the band sawing machine equipment is powered on, and subsequent actions can be performed according to the operator's operating instructions. The present invention uses the ball screw assembly 108 to accurately position the end face of the workpiece, and can perform subsequent clamping and sawing operations after ensuring that the workpiece is positioned in place, thereby ensuring processing accuracy and production safety, eliminating the problems of poor reliability and low accuracy of the human judgment method, and improving work efficiency.

[0032] In a preferred embodiment of the present invention, there are two groups of lead screws 1082, and the number of ball screws 1081 is two. The two groups of lead screws 1082 are arranged in parallel on the plastic plate 1083, and the two ball screws 1081 are arranged side by side on the corresponding lead screws 1082, respectively used for contact sensing positioning of two workpieces. In use, two workpieces 400 are placed on the workpiece placement area at the same time, and the two ball screws 1081 can be used for contact sensing positioning of the two workpieces 400, respectively, thereby improving processing efficiency.

[0033] During application, the first slider 103 moves along the axis 102, driving the sliding base 104 and the components thereon to move synchronously, thereby realizing the initial adjustment of the positioning position of the ball screw 1081; the second slider 106 moves along the slide rail 105, driving the positioning base 107 and the ball screw assembly 108 to move synchronously, thereby realizing the fine adjustment of the positioning position of the ball screw 1081, with high adjustment accuracy and good reliability.

[0034] To ensure positioning accuracy, the height of the sensing point of the ball screw 1081 is consistent with the height of the central axis of the workpiece 400. Correspondingly, the bottom end of the support base 101 is fixed to the side of the band saw through a height-adjustable foot nut 114. When processing workpieces of different diameters, the height of the support base 101 can be adjusted through the foot nut 114, and then the height of the ball screw assembly 108 can be adjusted to ensure that the sensing point of the ball screw 1081 is always located at the center of the end face of the workpiece 400, thereby improving the sawing accuracy and enhancing the applicability of the device.

[0035] In a preferred embodiment of the present invention, there are two shaft cores 102, and the two shaft cores 102 are arranged in parallel along the first direction X. Each shaft core 102 is provided with a first slider 103, and the sliding base 104 is fixed on the two first sliders 103. The two first sliders 103 can move synchronously along the corresponding shaft cores 102, respectively, driving the sliding base 104 and the upper components thereof to move along the first direction X, thereby realizing the initial adjustment of the positioning position of the ball head screw assembly 108.

[0036] See also Figure 2The inductive positioning mechanism 100 further includes a first positioning plate 109, a second positioning plate 110, a tooth bar 111, a first locking nut 112 and a second locking nut 113. The first positioning plate 109 is connected to the end of the sliding base 104, the second positioning plate 110 is connected to the end of the positioning base 107, the first positioning plate 109 and the second positioning plate 110 are arranged in parallel, the tooth bar 111 passes through the first positioning plate 109 and the second positioning plate 110 respectively along the first direction X, the tooth bar 11 is threadedly matched with the first positioning plate 109 and the second positioning plate 110, the first locking nut 112 and the second locking nut 113 are sleeved on the tooth bar 111, and the first locking nut 112 is close to the first positioning plate 109, and the second locking nut 113 is close to the second positioning plate 110. The first locking nut 112 and the second locking nut 113 are used to lock after the positioning position is adjusted, so as to ensure that the end surface positioning position of the workpiece is the same each time during batch processing, thereby improving the qualified rate of workpiece processing.

[0037] In a preferred embodiment of the present invention, the first positioning plate 109 is integrally connected to the sliding base 104, or is welded together, or is connected via fasteners; the second positioning plate 110 is integrally connected to the positioning base 107, or is welded together, or is connected via fasteners, and the fasteners may be general parts such as screws, bolts, studs, etc., and the present invention is not limited to this.

[0038] Please refer to Figure 1 and Figure 3 The clamping mechanism 200 is arranged in the workpiece placement area on the band saw table 301. The clamping mechanism 200 includes a band saw fixture 201, a cylinder 202, a pressing rod 203 and a pressing block 204. The band saw fixture 201 is arranged on the band saw table 301 and is used to clamp the workpiece 400 in the second direction Y. The cylinder 202 is arranged above the band saw fixture 201 along the third direction Z. The pressing rod 203 is arranged along the third direction Z. The upper end of the pressing rod 203 is connected to the output end of the cylinder 202, and the lower end of the pressing rod 203 is connected to the pressing block 204. The band saw fixture 201 is electrically connected to the control mechanism, and clamps or releases the workpiece 400 under the action of the control mechanism; the cylinder 202 is electrically connected to the control mechanism, and presses or releases the workpiece 400 under the action of the control mechanism. During application, after the ball screw 1081 positions the end face of the workpiece 400, the band saw fixture 201 moves closer to clamp the workpiece 400 in the second direction Y, and the cylinder 202 drives the pressing rod 203 and the pressing block 204 to press down to press the workpiece 400 in the third direction Z to prevent the workpiece from arching or warping during the sawing process, thereby ensuring the processing accuracy.

[0039] In one embodiment, the control mechanism is provided with a "clamping" switch, a "press down" switch, a "start" switch and a "reset" switch. On the premise that the ball head screw 1081 senses that the end face of the workpiece is in place, the "clamping" switch is used to control the band saw clamp 201 to perform a clamping operation, the "press down" switch is used to control the cylinder 202 to perform a press down operation, the "start" switch is used to control the saw blade 302 of the band saw to perform a sawing operation, and the "reset" switch is used to restore the device to its initial state after the sawing operation is completed.

[0040] The operation flow of the workpiece positioning and clamping device of the present invention cooperating with the band sawing machine to perform workpiece sawing processing is as follows:

[0041] (1) According to the requirements of workpiece sawing, adjust the positioning position of the ball screw 1081: use the stepping nut 114 to adjust the height of the support base 101 to ensure that the sensing point of the ball screw 1081 is located at the center of the end surface of the workpiece 400; use the cooperation of the first slider 103 and the shaft core 102 to preliminarily adjust the position of the ball screw 1081 in the first direction X, and use the cooperation of the second slider 106 and the slide rail 105 to fine-adjust the position of the ball screw 1081 in the first direction X; after adjusting the positioning position, tighten the first locking nut 112 against the first positioning plate 109, and tighten the second locking nut 113 against the second positioning plate 110, so as to lock the positioning position of the ball screw 1081, so as to ensure the consistency of the sawing size of the workpiece during batch processing;

[0042] (2) Positioning and clamping of workpieces: two workpieces 400 are placed side by side in the workpiece placement area on the band saw table 301, and the workpieces 400 are pushed rightward along the first direction X until the sensing point of the ball screw 1081 contacts the center of the right end surface of the workpiece, and the control mechanism receives the positioning signal of the ball screw 1081; after the workpiece 400 is positioned, the "clamping" switch of the equipment is pressed, and the control mechanism controls the band saw fixture 201 to clamp the workpiece 400 in the second direction Y; the "press down" switch of the equipment is pressed, and the control mechanism controls the oil cylinder 202 to press down, and drives the pressing block 204 to press the workpiece 400 in the third direction Z through the pressing rod 203;

[0043] (3) Sawing: After the workpiece 400 is positioned, clamped, and pressed, the "start" switch of the equipment is pressed, and the control mechanism controls the movement of the saw blade 302 of the band saw to saw the left end of the workpiece 400 according to the processing requirements;

[0044] (4) Reset: After the processing is completed, press the "reset" switch, the control mechanism controls the saw blade 302 to return to the initial position, the cylinder 202 drives the lower pressure rod 203 and the lower pressure block 204 to move up and reset, and the band saw machine fixture 201 releases the workpiece and resets.

[0045] In summary, the present invention provides a workpiece positioning and clamping device applied to a band saw, wherein the movement of the first slider on the shaft core drives the sliding base and the upper components to move, thereby realizing the initial adjustment of the positioning position of the ball screw, and the movement of the second slider on the slide rail drives the positioning base and the ball screw assembly to move, thereby realizing the fine adjustment of the positioning position of the ball screw, and the adjusted positioning position is locked by using the first locking nut and the second locking nut; when the workpiece is placed on the workpiece placement area of ​​the band saw table, the right end face of the workpiece is accurately positioned by using the ball screw assembly, the workpiece is clamped along the second direction by using the band saw fixture, and the workpiece is pressed along the third direction by driving the pressing rod and the pressing block by the oil cylinder; after the end face of the workpiece is accurately positioned and clamped, the band saw is started, and the saw blade of the band saw processes the left end of the workpiece. This device is easy to operate, has accurate positioning, fast adjustment, and smooth operation. It can avoid problems such as poor manual positioning accuracy and low processing accuracy caused by workpiece tilting or deflection during processing, and is suitable for batch processing operations of workpieces; the foot nut can adjust the height of the support base, and then adjust the height of the sensing point of the ball head screw assembly, which can be used to position the end faces of workpieces with different diameters, ensuring that the sensing point is always located in the center of the workpiece end face, thereby improving sawing accuracy, increasing the yield rate, and reducing scrap.

[0046] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A workpiece positioning and clamping device, characterized in that: It includes an inductive positioning mechanism and a clamping mechanism; The induction positioning mechanism comprises a support base, an axis core, a first slider, a sliding base, a slide rail, a second slider, a positioning base and a ball screw assembly, wherein the axis core is arranged at the top of the support base along a first direction, the first slider is arranged on the axis core so as to be movable along the first direction, the sliding base is arranged on the first slider, the slide rail is arranged on the sliding base along the first direction, the second slider is arranged on the slide rail so as to be movable along the first direction, the positioning base is fixed on the second slider, the ball screw assembly is arranged on the positioning base, and the sensing point of the ball screw assembly faces the workpiece placement area on the band saw table; The clamping mechanism is arranged in a workpiece placement area on the band saw table, and the clamping mechanism comprises a band saw fixture, an oil cylinder, a pressing rod and a pressing block. The band saw fixture is arranged on the band saw table and is used to clamp the workpiece in the second direction. The oil cylinder is arranged above the band saw fixture along the third direction. The pressing rod is arranged along the third direction. The upper end of the pressing rod is connected to the output end of the oil cylinder, and the lower end of the pressing rod is connected to the pressing block. The inductive positioning mechanism further includes a first positioning plate, a second positioning plate, a tooth bar, a first locking nut and a second locking nut, the first positioning plate is connected to an end of the sliding base by a fastener, the second positioning plate is connected to an end of the positioning base by a fastener, the first positioning plate and the second positioning plate are arranged in parallel, the tooth bar passes through the first positioning plate and the second positioning plate respectively along a first direction, the tooth bar is threadedly matched with the first positioning plate and the second positioning plate, the first locking nut and the second locking nut are sleeved on the tooth bar, and the first locking nut is close to the first positioning plate, and the second locking nut is close to the second positioning plate; The bottom end of the support base is fixed to the side of the band sawing machine through a height-adjustable spacer nut.

2. The workpiece positioning and clamping device according to claim 1, characterized in that: The ball screw assembly includes a ball screw, a lead screw and a plastic plate, the plastic plate is arranged on the positioning base, the lead screw is arranged on the plastic plate along the first direction, the ball screw is arranged on the lead screw along the first direction, and the sensing point of the ball screw faces the workpiece placement area on the band saw table.

3. The workpiece positioning and clamping device according to claim 2, characterized in that: There are two groups of lead screws, and the number of the ball screws is two. The two groups of lead screws are arranged in parallel on the plastic plate, and two ball screws are arranged side by side on the corresponding lead screws, and are respectively used for contact sensing positioning of two workpieces.

4. The workpiece positioning and clamping device according to claim 3, characterized in that: The height of the sensing point of the ball screw is consistent with the height of the center axis of the workpiece.

5. The workpiece positioning and clamping device according to any one of claims 1 to 4, characterized in that: The shaft core is cylindrical and has a smooth surface.

6. The workpiece positioning and clamping device according to any one of claims 1 to 4, characterized in that: There are two shaft cores, which are arranged in parallel along the first direction. Each shaft core is provided with the first sliding block, and the sliding base is fixed on the two first sliding blocks.

7. The workpiece positioning and clamping device according to any one of claims 1 to 4, characterized in that: It also includes a control mechanism, and the ball head screw assembly, the band saw machine clamp, and the oil cylinder are electrically connected to the control mechanism.

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