Multi-bar boring machine

Abstract

A multi-tool bar boring machine is provided, wherein multiple tool bars arranged above the tool bar frame are installed on the tool bar frame through a centering support device fixed on the tool bar frame, the tool bar frame is provided with a bracket that can move along its length direction, the bracket is provided with a rotating drive device connected to the right ends of the multiple tool bars and used to drive the multiple tool bars to rotate, and the bracket is provided with a feed drive device connected to the side wall of the tool bar frame and used to drive the bracket to move along the length direction of the tool bar frame; multiple workpieces arranged coaxially with the tool bars at corresponding positions above the workpiece frame are supported and fixed on the workpiece frame through multiple locking support devices fixed on the workpiece frame. The present invention greatly improves the processing efficiency of seamless titanium tubes, improves the stability and reliability of the support for workpieces and tool bars, solves the problems of vibration and tool jumping caused by the unstable support structure during the operation of the tool bar, improves the processing accuracy of seamless titanium tubes, has low processing costs, and can mass-produce seamless titanium tubes.

Description

Technical Field

[0001] The invention belongs to the technical field of inner hole processing, and in particular relates to a multi-tool bar pipe boring machine. Background Art

[0002] Titanium has the characteristics of low density, high specific strength, seawater corrosion resistance, good low-temperature toughness, etc. It is widely used in the fields of military industry, deep-sea equipment, national defense technology, etc. It is recognized as a natural "marine metal", and seamless titanium / titanium alloy pipes have a broader application prospect. At present, titanium / titanium alloy rods are used to make seamless thick-walled pipes through drilling, boring and other processes. For the processing of seamless pipes of small length, drilling, boring and other processes can be used. However, for the processing of longer seamless pipes, due to the increasingly higher processing accuracy requirements, the current boring equipment cannot meet the processing requirements of long seamless pipes, and the vibration and noise are large during operation. Not only is the hole wall accuracy low after processing, but the surface roughness and dimensional and geometric tolerances are difficult to guarantee. The size, roundness and cylindricity of the processed long seamless pipes are uncontrollable and the quality is unstable; the boring bar (tool bar) is connected by a rigid shaft, which has the disadvantage of instability during operation, resulting in tool jumping, which reduces the processing accuracy; in addition, due to the structural limitations of the boring equipment, the efficiency of processing long seamless pipes with a single boring bar is low and the processing cost is high. Therefore, in summary, it is necessary to make improvements. Summary of the invention

[0003] The technical problem solved by the present invention is as follows: a multi-tool bar pipe boring machine is provided, in which a plurality of tool bars are supported on a tool bar frame by a centering support device, and a workpiece coaxially arranged with the tool bar is locked and fixed on the workpiece frame by a locking support device, and driven by a rotation drive device provided on a bracket and used to drive the tool bar to rotate and a feed drive device used to drive the bracket to move along a feed direction, the floating boring cutters at the ends of the plurality of tool bars perform boring processing on the corresponding workpieces, thereby greatly improving the processing efficiency of seamless titanium tubes, improving the stability and reliability of the support for the workpieces and tool bars, solving the problems of vibration and tool jumping caused by the unstable support structure during the operation of the tool bar, improving the processing accuracy of seamless titanium tubes, reducing the processing cost, and facilitating the mass production of seamless titanium tubes.

[0004] The technical solution adopted by the present invention is a multi-tool pipe boring machine, comprising a tool rod frame and a workpiece frame arranged on the left side of the tool rod frame corresponding to the head and tail of the tool rod frame, wherein the multiple tool rods arranged above the tool rod frame are installed on the tool rod frame through a centering support device fixed on the tool rod frame, and the tool rod frame is provided with a bracket which can move along its length direction, and the bracket is provided with a rotating drive device connected to the right ends of the multiple tool rods and used to drive the multiple tool rods to rotate, and the bracket is provided with a feed drive device connected to the side wall of the tool rod frame and used to drive the bracket to move along the length direction of the tool rod frame; the multiple workpieces coaxially arranged with the tool rods at corresponding positions above the workpiece frame are supported and fixed on the workpiece frame through multiple locking support devices fixed on the workpiece frame, and the multiple tool rods are rotated under the drive of the rotating drive device, and then the multiple tool rods are driven by the feed drive device to drive the bracket to feed in the boring direction, so that the floating boring tool installed on the end of the tool rod performs boring along the boring end of the workpiece.

[0005] The camming plate is fixed with a screw bolt at the bottom end and a screw bolt is fixed on the bottom end of the camming plate, and the camming plate is fixed on the bottom end of the camming plate by welding.

[0006] Furthermore, the rotary drive device includes a reduction motor and a gear box, and the reduction motor and the gear box are fixed to the bracket by bolts. The output shaft of the reduction motor is connected to the input shaft of the gear box through a coupling, and the multiple output shafts of the gear box are respectively fixedly connected to the corresponding right end of the tool rod through a flange assembly.

[0007] Furthermore, the feed drive device includes a feed motor, a gear and a rack. A mounting plate is fixed on one side wall of the bracket. The feed motor is fixed to the mounting plate by bolts, and the output shaft of the feed motor passes through a through hole on the mounting plate and is fixedly connected to the gear. The rack is fixed to the side wall of the tool rod frame on the same side as the feed motor. The gear is meshed with the rack and, driven by the feed motor, the bracket realizes the feeding movement along the length direction of the tool rod frame.

[0008] Furthermore, the locking support device includes a gate-type bracket, a number of cylinders equal to the number of workpieces, an upper clamping piece and a lower clamping piece, the lower port of the gate-type bracket is arranged downward and fixed on the workpiece frame, a plurality of cylinders corresponding to the upper and lower positions of the workpiece are fixed on the inner top wall of the gate-type bracket, the piston rod end of the lower end of the cylinder is fixedly connected to the upper clamping piece, the lower clamping piece is fixed to the seat plate, and the seat plate is fixed to the cross beam of the workpiece frame by bolts, the workpiece is located between the upper clamping piece and the lower clamping piece, and the clamping or loosening of the workpiece by the upper clamping piece and the lower clamping piece is achieved by the extension and retraction of the cylinder piston rod, and the center height of the workpiece is adjusted by adding pads of different thicknesses between the cross beam of the workpiece frame and the seat plate or by providing pads on the lower clamping piece.

[0009] Furthermore, the upper clamping member and the lower clamping member both include a V-shaped plate and a channel steel, the V-shaped plate notch is arranged outward in a groove of the channel steel, and both sides of the channel steel are welded to the corresponding side outer walls of the V-shaped plate as a whole, the V-shaped plate notches on the upper clamping member and the lower clamping member are arranged facing each other, and the workpiece located between the two V-shaped plates is clamped and fixed in the two V-shaped plates after the upper clamping member is driven downward by a cylinder.

[0010] Furthermore, the channel steel in the lower clamping parts of the plurality of locking support devices is a whole long channel steel.

[0011] Furthermore, the bracket is of a U-shaped structure, and rollers rotatably mounted on the lower ends of the two side walls of the bracket are attached to the corresponding side outer walls of the tool bar frame, and guide rails with an I-shaped cross-section are fixed to the upper ends of the two long sides of the tool bar frame, and the rollers rotatably mounted on the inner walls on both sides of the bracket are adapted to the guide grooves on the outer sides of the guide rails, and the bracket is moved along the length direction of the guide rails under the drive of the feed drive device.

[0012] Furthermore, a circulating liquid pump is fixed to the left end of the workpiece frame, and the left end of the circulating liquid pump is connected to a liquid receiving pan provided at the right end of the workpiece frame and located below the boring end of the workpiece through a pipeline, and the other end of the circulating liquid pump is connected to a plurality of nozzles arranged toward the boring end of the workpiece at corresponding positions and used for spraying coolant into the boring holes of the workpiece.

[0013] The advantages of the present invention compared with the prior art are:

[0014] 1. This technical solution supports multiple tool bars on the tool bar frame through a centering support device, and locks and fixes the workpiece coaxially arranged with the tool bar on the workpiece frame through a locking support device. Under the drive of a rotation drive device arranged on a bracket and used to drive the tool bar to rotate and a feed drive device used to drive the bracket to move along a feed direction, the floating boring cutters at the ends of multiple tool bars can perform boring processing on the corresponding workpieces, which greatly improves the processing efficiency of seamless titanium tubes, improves the stability and reliability of the support for the workpiece and the tool bar, and solves the problems of vibration and tool jumping caused by the unstable support structure during the operation of the tool bar;

[0015] 2. This technical solution combines the rotary motion of the lower cutter bar driven by the rotary drive device on multiple cutter bars and the feed motion of the lower cutter bar driven by the feed drive device on the bracket to realize continuous boring processing of multiple workpieces, the processing efficiency of the seamless titanium tube is high, and the quality of the inner wall of the seamless titanium tube after forming is guaranteed;

[0016] 3. This technical solution adopts a centering support device formed by a bottom plate, a lower centering plate, an upper centering plate, a screw rod, and a linear bearing connected to the tool rod and rotatably installed in two semicircular grooves to support the tool rod on the tool rod frame, which greatly improves the running stability of the tool rod during feeding movement and provides stable support conditions for boring processing of the tool rod;

[0017] 4. This technical solution uses a cylinder with a lower piston rod fixedly connected to the upper clamping piece to drive the upper clamping piece to rise and fall, so that the upper clamping piece and the lower clamping piece can clamp and fix the workpiece, ensuring the position accuracy of the workpiece during the boring process. By adding pads of different thicknesses between the crossbeam and the seat plate of the workpiece frame or setting pads on the lower clamping piece, the center height of the workpiece can be adjusted, thereby meeting the processing of seamless titanium tubes of different sizes and having a wide processing range.

[0018] 5. This technical solution has a simple structure, stable and reliable operation, simple maintenance, high seamless titanium tube processing efficiency, improved seamless titanium tube processing accuracy, reduced processing costs, and facilitated mass production of seamless titanium tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front view of the structure of the present invention;

[0020] Figure 2 It is a top view of the structure of the present invention;

[0021] Figure 3 This is a front view of the centering support device structure of the present invention;

[0022] Figure 4 This is a top view of the centering support device structure of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the locking support device of the present invention;

[0024] Figure 6 It is a schematic diagram of the installation structure of the bracket and the tool rod frame and the feed drive device and the bracket of the present invention. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-6 An embodiment of the present invention is described to clearly and completely describe the technical solution. Obviously, the described embodiment is only a part of the embodiments of the present invention, rather than all the embodiments.

[0026] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the present invention.

[0027] Multi-bar boring machines, such as Figure 1-2As shown, it includes a tool bar frame 1 and a workpiece frame 2 which is arranged on the left side of the tool bar frame 1 corresponding to the end of the tool bar frame 1. A plurality of tool bars 3 arranged above the tool bar frame 1 are installed on the tool bar frame 1 through a centering support device 9 fixed on the tool bar frame 1. The tool bar frame 1 is provided with a bracket 4 which can move along its length direction. The bracket 4 is provided with a rotating drive device 5 which is connected to the right ends of the plurality of tool bars 3 and is used to drive the plurality of tool bars 3 to rotate. The bracket 4 is provided with a support which is connected to the side wall of the tool bar frame 1 and is used to rotate the plurality of tool bars 3. A feed drive device 6 is provided for driving the bracket 4 to move along the length direction of the tool bar frame 1; a plurality of workpieces 7 coaxially arranged with the tool bars 3 at corresponding positions above the workpiece frame 2 are supported and fixed on the workpiece frame 2 through a plurality of locking support devices 8 fixed on the workpiece frame 2; after the plurality of tool bars 3 are driven by the rotation drive device 5 to rotate, the feed drive device 6 drives the bracket 4 to drive the plurality of tool bars 3 to feed in the boring direction, so that the floating boring tool 10 installed at the end of the tool bar 3 is bored along the boring end of the workpiece 7 Boring; In the above structure, a plurality of tool bars 3 are supported on the tool bar frame 1 by the centering support device 9, and a workpiece 7 coaxially arranged with the tool bar 3 is locked and fixed on the workpiece frame 2 by the locking support device 8. Under the drive of the rotation drive device 5 arranged on the bracket 4 and used to drive the tool bar 3 to rotate and the feed drive device 6 used to drive the bracket 4 to move along the feed direction, the floating boring cutters 10 at the ends of the plurality of tool bars 3 are used to bore the corresponding workpieces 7, which greatly improves the processing efficiency of the seamless titanium tube and improves The stability and reliability of the support for the workpiece 7 and the tool bar 3 are improved, and the disadvantages of vibration and tool jumping caused by the unstable support structure during the operation of the tool bar 3 are solved; after the rotation drive device 5 drives the rotation movement of the lower tool bar 3 of the multiple tool bars 3 and the feed drive device 6 drives the lower tool bar 3 of the bracket 4 to feed the lower tool bar 3, continuous boring processing of multiple workpieces 7 is realized (the workpiece 7 is a seamless titanium tube after processing and forming), the processing efficiency of the seamless titanium tube is high, and at the same time, the quality of the inner wall of the seamless titanium tube after forming is guaranteed;

[0028] like Figure 3-4As shown, the specific structure of the centering support device 9 is as follows: the centering support device 9 includes a base plate 9-1, a lower centering plate 9-2 and an upper centering plate 9-3, the lower end of the lower centering plate 9-2 and the upper end of the upper centering plate 9-3 are both fixed with a connecting plate 9-4, the connecting plate 9-4 at the lower end of the lower centering plate 9-2 is welded and fixed to the base plate 9-1, and the base plate 9-1 is fixed to the cross bar of the tool rod frame 1 by bolts; the upper end of the lower centering plate 9-2 and the lower end of the upper centering plate 9-3 are both provided with a plurality of semicircular grooves 9-5 corresponding to each other in upper and lower positions and combined to form circular holes, and the two ends of the linear bearing 9-6 connected to the tool rod 3 are rotatably installed in the two corresponding semicircular grooves 9-5 through the bearings; two concentrically arranged positioning sleeves 9-7 are fixed on the plate surfaces on both sides of the connecting plate 9-4 on the lower centering plate 9-2, which are fixed to the rotating column 9 at the lower end of the screw rod 9-9 -8 is located between the two positioning sleeves 9-7, the short shafts at the two ends of the rotating column 9-8 are adapted to the corresponding side positioning sleeves 9-7, and the two end plate surfaces of the connecting plate 9-4 at the upper end of the upper centering plate 9-3 are formed with U-shaped grooves 9-10, and after the screw rod 9-9 is rotated to the upper end to adapt to the U-shaped groove 9-10 and fit and screw with the locking nut 9-11 above the U-shaped groove 9-10, the lower centering plate 9-2 and the upper centering plate 9-3 clamp and fix the linear bearing 9-6; in the above structure, the centering support device 9 formed by the base plate 9-1, the lower centering plate 9-2, the upper centering plate 9-3, the screw rod 9-9 and the linear bearing 9-6 connected to the tool rod 3 and rotatably installed in the two semicircular grooves 9-5 is used to support the tool rod 3 on the tool rod frame 1, which greatly improves the running stability of the tool rod 3 during the feeding movement and provides stable support conditions for the boring processing of the tool rod 3;

[0029] The specific structure of the rotary drive device 5 is as follows: the rotary drive device 5 includes a reduction motor 5-1 and a gear box 5-2, the reduction motor 5-1 and the gear box 5-2 are fixed to the bracket 4 by bolts, the output shaft of the reduction motor 5-1 is connected to the input shaft of the gear box 5-2 through a coupling, and the multiple output shafts of the gear box 5-2 are respectively fixedly connected to the corresponding right end of the tool rod 3 through a flange assembly.

[0030] like Figure 6 As shown, the specific structure of the feed drive device 6 is as follows: the feed drive device 6 includes a feed motor 6-1, a gear 6-2 and a rack 6-3, a mounting plate 6-4 is fixed on one side wall of the bracket 4, the feed motor 6-1 is fixed to the mounting plate 6-4 by bolts, and the output shaft of the feed motor 6-1 passes through the through hole on the mounting plate 6-4 and is fixedly connected to the gear 6-2, the rack 6-3 is fixed to the side wall of the tool bar frame 1 on the same side as the feed motor 6-1, the gear 6-2 is meshed with the rack 6-3, and the feed movement of the bracket 4 along the length direction of the tool bar frame 1 is realized under the drive of the feed motor 6-1.

[0031] like Figure 5 As shown, the specific structure of the locking support device 8 is as follows: the locking support device 8 includes a gate-shaped bracket 8-1, cylinders 8-2 of the same number as the workpiece 7, an upper clamping member and a lower clamping member, the lower port of the gate-shaped bracket 8-1 is arranged downward and fixed on the workpiece frame 2, a plurality of cylinders 8-2 corresponding to the upper and lower positions of the workpiece 7 are fixed on the inner top wall of the gate-shaped bracket 8-1, the piston rod end of the lower end of the cylinder 8-2 is fixedly connected to the upper clamping member, the lower clamping member is fixed on the seat plate 8-3, and the seat plate 8-3 The workpiece 7 is fixed to the crossbeam of the workpiece frame 2 by bolts, and the workpiece 7 is located between the upper clamping member and the lower clamping member, and the upper clamping member and the lower clamping member clamp or loosen the workpiece 7 by the extension and contraction of the piston rod of the cylinder 8-2. The center height of the workpiece 7 is adjusted by adding pads of different thicknesses between the crossbeam of the workpiece frame 2 and the seat plate 8-3 or by setting pads on the lower clamping member; Specifically, the specific structure of the upper clamping member and the lower clamping member is as follows: The upper clamping member and the lower clamping member both include a V-shaped plate 8-4 and a channel steel 8- 5, the notch of the V-shaped plate 8-4 is arranged outward in the groove of the channel steel 8-5, and the two sides of the channel steel 8-5 are welded to the outer wall of the corresponding side of the V-shaped plate 8-4 as a whole, the notches of the V-shaped plate 8-4 on the upper clamping member and the lower clamping member are arranged facing each other, and the workpiece 7 located between the two V-shaped plates 8-4 is clamped and fixed in the two V-shaped plates 8-4 after the upper clamping member is driven downward by the cylinder 8-2; specifically, the channel steel 8-5 in the lower clamping member of the plurality of locking support devices 8 is a whole long channel steel; in the above structure, After the cylinder 8-2 whose lower end piston rod is fixedly connected to the upper clamping piece drives the upper clamping piece to rise and fall, the upper clamping piece and the lower clamping piece clamp and fix the workpiece 7, thereby ensuring the position accuracy of the workpiece during the boring process, avoiding the unreliable fixed position of the workpiece 7 and affecting the boring accuracy of the workpiece 7, and by adding pads of different thicknesses between the crossbeam of the workpiece frame 2 and the seat plate 8-3 or by setting pads on the lower clamping piece, the center height of the workpiece 7 can be adjusted, thereby meeting the processing of seamless titanium tubes of different sizes, and having a wide processing range;

[0032] like Figure 6 As shown, the installation structure of the bracket 4 on the tool bar frame 1 is as follows: the bracket 4 is a U-shaped structure, and the lower ends of the two side walls of the bracket 4 are rotatably mounted with rollers 12 attached to the corresponding side outer walls of the tool bar frame 1, and the upper ends of the two long sides of the tool bar frame 1 are fixed with guide rails 11 with an I-shaped cross-section, and the rollers 12 rotatably mounted on the inner walls on both sides of the bracket 4 are adapted to the guide grooves on the outer sides of the guide rails 11, and the bracket 4 is moved along the length direction of the guide rails 11 under the drive of the feed drive device 6.

[0033] In order to facilitate the cooling, lubrication and chip removal of the workpiece 7 during the boring process, a coolant circulation structure is specially set up, specifically as follows: a circulating liquid pump 13 is fixed to the left end of the workpiece frame 2, and the left end of the circulating liquid pump 13 is connected to a liquid receiving tray 14 arranged at the right end of the workpiece frame 2 and located below the boring end of the workpiece 7 through a pipeline, and the other end of the circulating liquid pump 13 is connected to a plurality of nozzles arranged toward the boring end of the workpiece 7 at a corresponding position and used to spray coolant into the boring hole of the workpiece 7.

[0034] The technical solution has a simple structure, stable and reliable operation, simple maintenance, high seamless titanium tube processing efficiency, improved seamless titanium tube processing accuracy, reduced processing costs, and is convenient for mass production of seamless titanium tubes.

[0035] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0036] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. Multi-bar boring machine, characterized by: The invention comprises a tool bar frame (1) and a workpiece frame (2) arranged on the left side of the tool bar frame (1) at the end corresponding to the tool bar frame (1); a plurality of tool bars (3) arranged above the tool bar frame (1) are mounted on the tool bar frame (1) via a centering support device (9) fixed on the tool bar frame (1); a bracket (4) movable along its length direction is provided on the tool bar frame (1); a rotation drive device (5) connected to the right ends of the plurality of tool bars (3) and used to drive the plurality of tool bars (3) to rotate is provided on the bracket (4); a rotating drive device (5) connected to the side wall of the tool bar frame (1) and used to drive the plurality of tool bars (3) to rotate is provided on the bracket (4); A feed drive device (6) moves the bracket (4) along the length direction of the tool bar frame (1); a plurality of workpieces (7) coaxially arranged with the tool bars (3) at corresponding positions above the workpiece frame (2) are supported and fixed on the workpiece frame (2) by a plurality of locking support devices (8) fixed on the workpiece frame (2); after the plurality of tool bars (3) are driven by the rotation drive device (5) to rotate, the feed drive device (6) drives the bracket (4) to drive the plurality of tool bars (3) to feed in the boring direction, so that a floating boring tool (10) installed at the end of the tool bar (3) can bore along the boring end of the workpiece (7); The centering support device (9) comprises a base plate (9-1), a lower centering plate (9-2) and an upper centering plate (9-3); the lower end of the lower centering plate (9-2) and the upper end of the upper centering plate (9-3) are both fixed with connecting plates (9-4); the connecting plate (9-4) at the lower end of the lower centering plate (9-2) is welded and fixed to the base plate (9-1); the base plate (9-1) is fixed to the crossbar of the tool bar frame (1) by bolts; the upper end of the lower centering plate (9-2) and the lower end of the upper centering plate (9-3) are both provided with a plurality of semicircular grooves (9-5) at upper and lower positions corresponding to each other and combined to form circular holes; and the two ends of a linear bearing (9-6) connected to the tool bar (3) are rotatably mounted on the two semicircular grooves (9-5) at corresponding positions by means of bearings. ); two concentrically arranged positioning sleeves (9-7) are fixed on both side plate surfaces of the connecting plate (9-4) on the lower centering plate (9-2); a rotating column (9-8) fixed to the lower end of the screw rod (9-9) is located between the two positioning sleeves (9-7); the short shafts at both ends of the rotating column (9-8) fit into the corresponding side positioning sleeves (9-7); U-shaped grooves (9-10) are formed on both end plate surfaces of the connecting plate (9-4) at the upper end of the upper centering plate (9-3); after the screw rod (9-9) is rotated until the upper end fits into the U-shaped groove (9-10) and is screwed with the locking nut (9-11) above the U-shaped groove (9-10), the lower centering plate (9-2) and the upper centering plate (9-3) can clamp and fix the linear bearing (9-6); The locking support device (8) comprises a gate-shaped bracket (8-1), cylinders (8-2) of the same number as the workpieces (7), an upper clamping piece and a lower clamping piece, the lower end of the gate-shaped bracket (8-1) being arranged with its lower port facing downward and fixed on the workpiece frame (2), a plurality of cylinders (8-2) corresponding to the upper and lower positions of the workpieces (7) being fixed on the inner top wall of the gate-shaped bracket (8-1), the piston rod ends of the lower ends of the cylinders (8-2) being fixedly connected to the upper clamping piece, and the lower clamping piece being fixed On a seat plate (8-3), the seat plate (8-3) is fixed to a crossbeam of a workpiece frame (2) by bolts, the workpiece (7) is located between an upper clamping member and a lower clamping member, and the upper clamping member and the lower clamping member clamp or release the workpiece (7) by telescoping a piston rod of a cylinder (8-2), and the center height of the workpiece (7) is adjusted by adding pads of different thicknesses between the crossbeam of the workpiece frame (2) and the seat plate (8-3) or by providing a pad on the lower clamping member; The upper clamping member and the lower clamping member both comprise a V-shaped plate (8-4) and a channel steel (8-5); the notch of the V-shaped plate (8-4) is arranged outwardly in a groove of the channel steel (8-5); the two sides of the channel steel (8-5) are welded to the corresponding side outer walls of the V-shaped plate (8-4) as a whole; the notches of the V-shaped plates (8-4) on the upper clamping member and the lower clamping member are arranged facing each other; and the workpiece (7) located between the two V-shaped plates (8-4) is clamped and fixed in the two V-shaped plates (8-4) after the upper clamping member is driven downward by the cylinder (8-2); The bracket (4) is of a U-shaped structure. The lower ends of the two side walls of the bracket (4) are rotatably mounted with rollers (12) attached to the corresponding side outer walls of the knife bar frame (1). The upper ends of the two long sides of the knife bar frame (1) are fixed with guide rails (11) with an I-shaped cross section. The rollers (12) rotatably mounted on the inner walls of the two sides of the bracket (4) are adapted to the guide grooves on the outer sides of the guide rails (11), and the bracket (4) is driven by the feed drive device (6) to move along the length direction of the guide rails (11).

2. The multi-bar boring machine according to claim 1, characterized in that: The rotary drive device (5) comprises a reduction motor (5-1) and a gear box (5-2), wherein the reduction motor (5-1) and the gear box (5-2) are both fixed to a bracket (4) by means of bolts, an output shaft of the reduction motor (5-1) and an input shaft of the gear box (5-2) are connected by means of a coupling, and a plurality of output shafts of the gear box (5-2) are respectively fixedly connected to the right end of a corresponding knife rod (3) by means of a flange assembly.

3. The multi-bar boring machine according to claim 1, characterized in that: The feed drive device (6) comprises a feed motor (6-1), a gear (6-2) and a rack (6-3); a mounting plate (6-4) is fixed on one side wall of the bracket (4); the feed motor (6-1) is fixed to the mounting plate (6-4) by bolts, and the output shaft of the feed motor (6-1) passes through a through hole on the mounting plate (6-4) and is fixedly connected to the gear (6-2); the rack (6-3) is fixed to the side wall of the tool bar frame (1) on the same side as the feed motor (6-1); the gear (6-2) meshes with the rack (6-3), and under the drive of the feed motor (6-1), the feed movement of the bracket (4) along the length direction of the tool bar frame (1) is realized.

4. The multi-bar boring machine according to claim 1, characterized in that: The channel steel (8-5) in the lower clamping parts of the plurality of locking support devices (8) is a whole long channel steel.

5. The multi-bar boring machine according to any one of claims 1 to 4, characterized in that: A circulating liquid pump (13) is fixed to the left end of the workpiece frame (2); the left end of the circulating liquid pump (13) is connected to a liquid receiving tray (14) provided at the right end of the workpiece frame (2) and located below the boring end of the workpiece (7) through a pipeline; the other end of the circulating liquid pump (13) is connected to a plurality of nozzles provided toward the boring end of the workpiece (7) at corresponding positions and used for spraying cooling liquid into the boring hole of the workpiece (7).

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