A boring machine

Abstract

The present invention provides a boring machine, which belongs to the field of mechanical processing technology. It solves the problem that the existing boring machine is inconvenient to disassemble and assemble the workpiece when processing the inner hole of a large workpiece. The boring machine includes a frame, a boring bar, a power device and a boring die for fixing the workpiece, the boring die includes an inner support seat and an outer support seat, the boring bar includes a front boring bar and a rear boring bar that are detachably coaxially plugged, the front boring bar is inserted on the inner support seat, the rear boring bar is inserted on the outer support seat, one end of the front boring bar is connected to the output shaft of the power device, the rear boring bar is axially provided with a through hole and a pull rod is inserted in the through hole, both ends of the pull rod extend out of the through hole, one end of the pull rod has an external thread and is threadedly connected to the front boring bar, the other end of the pull rod has an abutment portion, and a boring cutter is provided on the circumference of the front boring bar near one end of the rear boring bar. In the process of loading and unloading the workpiece, the front boring bar and the rear boring bar can move towards each other, which not only improves the loading and unloading efficiency of the workpiece, but also ensures the matching accuracy between the boring bar and the boring cutter.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and relates to a boring machine, in particular to a boring machine used for processing a workpiece with a relatively large and long boring hole. Background Art

[0002] The pump body of a Roots pump or a twin-screw pump is usually large in size, and the inner cavity that matches the rotor in the pump body is also large in size and long in length, so it cannot be directly processed by a machining center. At present, the pump body is usually first formed by casting, and then the boring bar of a boring machine is inserted into the prefabricated hole of the pump body for boring, so that the inner cavity of the pump body reaches a higher precision.

[0003] Since the hole to be bored is long, the boring bar also needs to be designed to be long, which results in a heavy boring bar. If the boring bar lacks support during boring, the boring bar will be deformed to a certain extent under the action of gravity, resulting in poor processing accuracy. Therefore, in order to ensure the accuracy of processing large workpieces, the workpiece is usually fixed to the boring die seat first, as disclosed in a special boring machine tool in Chinese patent application (application number: 201020653190.4), and then the boring bar is inserted into the boring die seat and the prefabricated hole of the workpiece. The two ends of the boring bar are positioned by the inner and outer boring die seats located on both sides of the workpiece to ensure the rigidity of the boring bar, thereby ensuring the processing accuracy. However, in order to ensure the positioning accuracy of the boring bar, the boring bar and the inner and outer boring die seats are usually slidably matched with the bearing shells arranged on the inner and outer boring die seats. The size of the inner hole of the bearing shell is basically the same as the outer diameter of the boring bar. When the boring bar processes the workpiece, it is necessary to set a boring tool on the boring tool hole on the outer wall of the boring bar. This results in the overall outer diameter of the boring bar with the boring tool part being larger than the hole diameter of the inner hole of the bearing shell. Therefore, when processing the workpiece, it is necessary to first fix the workpiece to the boring die seat, and then extend the boring bar without the boring tool installed into the bearing shell of the inner boring die seat, the prefabricated hole of the workpiece and the bearing shell of the outer boring die seat in turn, so that the boring tool hole of the boring bar is located between the inner boring die seat and the workpiece, and then install the boring tool on the boring bar, and then drive the boring bar to bore the workpiece through the feeding device and the power drive device. When boring is completed, the workpiece can only be taken out from the boring die seat after the boring bar is pulled out. However, due to the interference between the boring cutter and the bearing shell, the boring bar cannot be directly pulled out from the boring die seat and the workpiece. The boring cutter must be removed from the boring bar before the boring bar can be withdrawn. This not only makes the entire disassembly and assembly process more cumbersome, but also affects the matching accuracy of the boring cutter and the boring bar. The boring cutter needs to be adjusted for each boring, which is time-consuming and labor-intensive. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems in the prior art and to propose a boring machine. The technical problem to be solved by the present invention is: how to improve the loading and unloading efficiency of workpieces when processing large workpieces.

[0005] The objectives of the present invention can be achieved through the following technical solutions: A boring machine, comprising a frame, a boring bar, a power device slidably arranged on the frame, and a boring die arranged opposite to the power device and used to fix a workpiece, the boring die comprising an inner support seat and an outer support seat arranged at intervals, characterized in that the boring bar comprises a front boring bar and a rear boring bar that are detachably and coaxially plugged in, the front boring bar is penetrated through the inner support seat, the rear boring bar is penetrated through the outer support seat, one end of the front boring bar is connected to the output shaft of the power device, the rear boring bar is axially provided with a through hole and a pull rod is penetrated through the through hole, both ends of the pull rod extend out of the through hole, one end of the pull rod has an external thread and is threadedly connected to the front boring bar, the other end of the pull rod has a rest portion for resting against the end face of the rear boring bar, and a boring tool is circumferentially arranged on the front boring bar near one end of the rear boring bar.

[0006] This boring machine is mainly used for processing inner holes with larger diameter and longer length on larger workpieces. The power unit is connected to the frame in a transverse sliding manner, the boring die is arranged on the side of the frame opposite to the power unit, and the workpiece is fixed between the inner support seat and the outer support seat of the boring die. In this case, the boring bar adopts a structure in which the front boring bar and the rear boring bar are detachably connected, wherein the front boring bar is connected to the power unit and passed through the inner support seat, and at the same time, it forms support and positioning by cooperating with the axial hole on the inner support seat, so that the front boring bar can slide axially and rotate around the axial direction relative to the inner support seat, and the rear boring bar is passed through the outer support seat, and forms support and positioning by cooperating with the axial hole on the outer support seat, so that the rear boring bar can slide axially and rotate around the axial direction relative to the outer support seat. When the workpiece needs to be mounted on the boring die to bore a hole, the front boring bar and the rear boring bar are first separated and moved in opposite directions, that is, the front boring bar moves toward the inner support seat so that the boring cutter on the front boring bar is located between the inner support seat and the outer support seat and is adjacent to the inner support seat, and the rear boring bar moves toward the outer support seat so that a space for the workpiece to be placed is formed between the inner support seat and the outer support seat; when the workpiece is fixed between the inner support seat and the outer support seat, the front boring bar and the rear boring bar are driven again. The front boring bar and the rear boring bar are relatively moved and extended into the prefabricated hole to be processed in the workpiece, and the front boring bar and the rear boring bar are connected by threading through the pull rod to form a stable connection between the front boring bar and the rear boring bar, and then the boring bar is driven by the power device to make the boring cutter on the boring bar process the prefabricated hole; after the processing is completed, it is only necessary to screw the pull rod to pull the front boring bar and the rear boring bar out of the workpiece in opposite directions. At this time, it is only necessary to loosen the positioning of the boring die on the workpiece to remove the workpiece from the boring die. In this way, the steps of disassembling and assembling the boring cutter are avoided every time the workpiece is loaded and unloaded, so that the disassembly and assembly efficiency of the workpiece is higher, and the matching accuracy of the boring cutter and the boring bar is also guaranteed.

[0007] The boring bar of the present invention adopts a structure in which the front boring bar and the rear boring bar are positioned by plugging and fitting and then fixed by a pull rod threaded connection to realize a detachable connection between the front boring bar and the rear boring bar. Compared with the direct threaded connection between the front boring bar and the rear boring bar, the present invention only needs to screw the pull rod, and there is no need for relative rotation between the front boring bar and the rear boring bar. No relative sliding will be formed between the contact surfaces of the front boring bar and the rear boring bar, thereby ensuring the accuracy of the plug-in structure, and the matching accuracy between the front boring bar and the rear boring bar is higher. Moreover, the overall mass of the pull rod is smaller, and the force required for screwing the pull rod is also smaller, so that both disassembly and assembly are lighter and more efficient.

[0008] In the above-mentioned boring machine, a tapered hole is formed on the end surface of the front boring bar facing the rear boring bar, a threaded hole is formed at the bottom of the tapered hole and is threadedly connected to the tie rod, and a tapered boss is formed on the end surface of the rear boring bar facing the front boring bar and is interference-fitted with the tapered hole. The tapered hole and the tapered boss are matched to ensure the matching accuracy and connection tightness between the front boring bar and the rear boring bar, and the tension generated by the bolt connection between the tie rod and the front boring bar ensures the overall structural stability of the boring bar.

[0009] In the above-mentioned boring machine, the tie rod is in the shape of a long column, the diameter of the tie rod is smaller than the inner diameter of the through hole, and the outer diameter of the abutment portion is larger than the inner diameter of the through hole. In this way, the tie rod can smoothly rotate in the through hole during the screwing process, avoiding the torque on the tie rod from being transmitted to the rear boring bar, ensuring the matching accuracy between the front boring bar and the rear boring bar, and when the tie rod is screwed into place, the abutment portion at the rear end of the tie rod abuts against the rear end of the rear boring bar, so that the front boring bar and the rear boring bar fit tightly.

[0010] In the above-mentioned boring machine, the length of the tapered hole is greater than the length of the tapered boss, and a retaining ring is sleeved and fixed on one end of the pull rod that is threadedly connected to the front boring bar, and the retaining ring is located outside the through hole and the outer diameter of the retaining ring is greater than the inner diameter of the through hole. The retaining ring can be connected to the pull rod by threaded connection or welding and is located between the bottom wall of the tapered hole and the tapered boss. The provision of the retaining ring prevents the pull rod from coming out of the through hole of the rear boring bar. When the pull rod is separated from the front boring bar, the rear boring bar can be driven to move by pulling the pull rod.

[0011] In the above-mentioned boring machine, the end of the pull rod with one end of the abutment portion is coaxially fixed with a handle, the handle is columnar, there is a distance between the handle and the rear boring bar, the diameter of the handle is larger than the outer diameter of the pull rod so that the end of the handle facing the through hole forms a striking surface for the hammer to strike. Since the plug-in tapered hole and tapered boss formed between the front boring bar and the rear boring bar are interference fit, the connection between the two is relatively firm, and it is difficult to directly separate the front boring bar and the rear boring bar with bare hands. The setting of the handle enables the staff to use a wooden hammer to strike the striking surface on the handle, and the striking force of the wooden hammer is transmitted to the rear boring bar through the retaining ring, so that the tapered hole and the tapered boss are separated. When the tapered hole and the tapered boss are separated, the rear boring bar can be driven to move by holding the handle.

[0012] In the above-mentioned boring machine, a weight-reducing hole is opened in the front boring bar along the axial direction, and the weight-reducing hole is connected to the threaded hole. The setting of the weight-reducing hole can reduce the weight of the front boring bar as much as possible under the premise of ensuring the structural strength of the front boring bar. Moreover, since the tapered hole and the tapered boss are interference fit, when the two are plugged in, the air in the tapered hole can enter the weight-reducing hole through the threaded hole, thereby avoiding affecting the fitting accuracy due to the presence of air in the tapered hole.

[0013] In the above-mentioned boring machine, the inner support seat and the outer support seat respectively have axial holes arranged opposite to each other, the end surface of the outer support seat facing the inner support seat is provided with a plurality of positioning blocks, the positioning blocks are arranged at intervals around the axial hole, the inner support seat is provided with a plurality of ejector rod assemblies which cooperate with the positioning blocks and are used to clamp the workpiece, the ejector rod assemblies are arranged at intervals around the axial hole and protrude toward one side of the outer support seat. One end of the workpiece fits against the positioning block, and the ejector rod assembly abuts against the end surface of the other end of the workpiece, so that the workpiece is fixed in the boring die.

[0014] In the above-mentioned boring machine, the inner support seat is provided with a plurality of guide holes corresponding to the push rod assembly one by one, and the push rod assembly includes a push rod, a screw rod and a guide sleeve, the push rod is inserted into the guide hole and extends out of the guide hole toward one end of the outer support seat, and a cavity for accommodating a boring tool is formed between the ends of each push rod extending out of the outer support seat, the guide sleeve is fixed to the side of the inner support seat away from the outer support seat and is coaxial with the guide hole, and the screw rod is threadedly connected to the guide sleeve and is coaxially connected to the push rod. In this way, the push rod can adjust its position through the screw rod, so as to cooperate with the positioning block to clamp the workpiece, and the setting of the push rod enables the workpiece to be fixed between the inner support seat and the outer support seat, and there is a space for accommodating the boring tool between the workpiece and the inner support seat, so that the front boring rod can be smoothly withdrawn from the workpiece, avoiding the front boring rod from interfering with the loading and unloading of the workpiece.

[0015] In the above-mentioned boring machine, the boring die also includes a base, the inner support seat and the outer support seat are fixed on the base, and a plurality of height-adjustable supports for supporting the workpiece are arranged at intervals on the upward end surface of the base, and the supports are located between the inner support seat and the outer support seat. The height of the supports is adjustable so that they can adapt to workpieces of different sizes and ensure the matching accuracy between the prefabricated hole of the workpiece fixed to the boring die and the boring bar.

[0016] In the above-mentioned boring machine, the end surface of the positioning block facing the push rod assembly is provided with a mounting groove, a positioning pin and a spring for pushing the positioning pin outward are provided in the mounting groove, a pressure cover for covering the mounting groove is fixed in the mounting groove, a clearance hole is provided on the pressure cover, and one end of the positioning pin passes through the clearance hole and extends out of the mounting groove. The provision of the positioning pin enables the workpiece to remain in a fixed state even when the push rod is not fully in place during the fixing process, thereby avoiding position deviation during the fixing process of the workpiece and ensuring the positioning accuracy of the workpiece.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The boring bar of the present invention adopts a structure in which the front boring bar and the rear boring bar are detachably connected. The front boring bar and the rear boring bar are respectively matched with the inner support seat and the outer support seat of the boring die, so that the front boring bar and the rear boring bar can move toward each other during the loading and unloading process of the workpiece, so that the boring bar does not need to be completely withdrawn from the boring die to load and unload the workpiece, avoiding the operation of disassembling and assembling the boring cutter every time the workpiece is loaded and unloaded, which not only improves the loading and unloading efficiency of the workpiece, but also ensures the matching accuracy between the boring bar and the boring cutter.

[0019] 2. The boring bar of the present invention uses the front boring bar and the rear boring bar to ensure the connection accuracy through the interference fit of the tapered hole and the tapered boss, and then fixes them through the tie rod thread connection, so that when the tie rod is screwed to fix the front boring bar and the rear boring bar, there will be no relative sliding between the tapered hole and the tapered boss, and the tapered hole and the tapered boss are only subjected to pressure along the radial direction of the boring bar, and the fit between the tapered hole and the tapered boss is more accurate. In addition, a handle is provided on the tie rod, and when the front boring bar and the rear boring bar are separated, the tightly fitted tapered hole and the tapered boss can be separated by knocking on the knocking surface on the handle, which is simple and convenient to operate.

[0020] 3. The inner support seat and the outer support seat are respectively provided with a push rod assembly and a positioning block to clamp and fix the two end surfaces of the workpiece. This structure is used to position the workpiece so that there is space for accommodating the boring tool between the workpiece and the inner support seat, so that the front boring bar can be smoothly pulled out of the workpiece, avoiding interference of the front boring bar with the loading and unloading of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the boring machine when fixing the workpiece;

[0022] Figure 2 It is a structural diagram of a boring bar;

[0023] Figure 3 yes Figure 2 Enlarged view of part a in the middle;

[0024] Figure 4 yes Figure 2 Enlarged view of part b in the middle;

[0025] Figure 5 It is a schematic diagram of the structure in which the workpiece is fixed in the boring die;

[0026] Figure 6 It is a schematic diagram of the structure when the workpiece is loaded and unloaded in the boring die;

[0027] Figure 7 is a schematic diagram of the structure of the outer support seat;

[0028] Figure 8It is a cross-sectional view of the positioning block;

[0029] Fig. 9 It is a structural schematic diagram of the inner support seat;

[0030] Fig.10 It is a structural schematic diagram of the ejector assembly.

[0031] In the figure, 1, frame; 2, power unit; 3, boring die; 31, inner support seat; 31a, guide hole; 32, outer support seat; 3a, shaft hole; 3b, bearing; 33, base; 33a, support; 4, boring bar; 41, front boring bar; 41a, tapered hole; 41b, threaded hole; 41c, weight-reducing hole; 42, rear boring bar; 42a, through hole; 42b, tapered boss; 43, pull rod; 43a, abutment; 43b, retaining ring; 43c, handle; 43d, striking surface; 5, boring tool; 51, cutter disc; 52, cutter head; 6, push rod assembly; 61, push rod; 62, screw; 63, guide sleeve; 71, positioning block; 71a, mounting groove; 72, positioning pin; 73, pressure cover; 74, spring; 8, workpiece. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0033] like Figures 1 to 6 As shown, a boring machine is mainly used for processing long holes of large workpieces 8 such as screw pump bodies or Roots pump bodies, including a frame 1, a power device 2, a boring die 3 and a boring rod 4, wherein the power device 2 is laterally slidably arranged on the frame 1, the boring die 3 is arranged on the frame 1 and is opposite to the power device 2, the boring die 3 includes an inner support seat 31 and an outer support seat 32 arranged at intervals, and the boring rod 4 includes a detachable coaxial The front boring bar 41 and the rear boring bar 42 are inserted, the front boring bar 41 is inserted on the inner support seat 31, and the rear boring bar 42 is inserted on the outer support seat 32. One end of the front boring bar 41 is connected to the output shaft of the power device 2. The front boring bar 41 and the rear boring bar 42 are threadedly connected and fixed to the front boring bar 41 through a pull rod 43 inserted in the rear boring bar 42. A boring tool 5 is provided on the circumference of the front boring bar 41 near one end of the rear boring bar 42. When the workpiece 8 is disassembled, the front boring bar 41 and the rear boring bar 42 can be disassembled to facilitate the placement of the workpiece 8, avoiding the disassembly of the boring tool 5.

[0034] Specifically, Figures 1 to 4As shown, a guide rail is arranged horizontally on the frame 1, the power device 2 is slidably arranged on the guide rail, and a driving device for driving the power device 2 to move along the guide rail is arranged on the frame 1. The power device 2 includes a driving motor and a transmission mechanism located below the driving motor. The transmission mechanism can be a reduction box or a pulley transmission mechanism. The transmission mechanism has a transmission shaft arranged along the length direction of the guide rail, so that the power device 2 can drive the transmission shaft to rotate. The boring bar 4 includes a front boring bar 41 and a rear boring bar 42 in the shape of a long bar, wherein a tapered hole 41a is formed on the end surface of the front boring bar 41 facing the rear boring bar 42, a threaded hole 41b is formed at the bottom of the tapered hole 41a, a tapered boss 42b which is interference fit with the tapered hole 41a is formed on the end surface of the rear boring bar 42 facing the front boring bar 41, and a through hole 42a penetrating the tapered boss 42b is formed in the axial direction of the rear boring bar 42, a pull rod 43 is penetrated in the through hole 42a, the diameter of the pull rod 43 is smaller than the inner diameter of the through hole 42a, both ends of the pull rod 43 extend out of the through hole 42a, and one end of the pull rod 43 facing the front boring bar 41 The pull rod 43 has an external thread, and one end away from the front boring bar 41 has a supporting portion 43a, and the diameter of the supporting portion 43a is greater than the diameter of the through hole 42a. In this way, after the front boring bar 41 and the rear boring bar 42 are plugged into the tapered hole 41a and the tapered boss 42b, the pull rod 43 is threadedly connected to the threaded hole 41b of the front boring bar 41, so that the supporting portion 43a can be abutted against the end face of one end of the front boring bar 41, thereby ensuring the stability of the connection between the front boring bar 41 and the rear boring bar 42, and when the front boring bar 41 and the rear boring bar 42 are connected, relative rotation between the tapered boss 42b and the tapered hole 41a is avoided. In this embodiment, the cone angle of the tapered hole 41a and the tapered boss 42b is 3° to 10°. Of course, a washer can also be set between the supporting portion 43a and the rear boring bar 42 to ensure the stability of the connection.

[0035] A retaining ring 43b is also sleeved and fixed on one end of the pull rod 43 which is threadedly connected to the front boring rod 41. The retaining ring 43b is located on the outside of the through hole 42a and the outer diameter of the retaining ring 43b is larger than the inner diameter of the through hole 42a. At the same time, the length of the tapered hole 41a is larger than the length of the tapered boss 42b, so that the retaining ring 43b can be located between the bottom wall of the tapered hole 41a and the tapered boss 42b after the tapered hole 41a and the tapered boss 42b are plugged into each other. The pull rod 43 has an end of the abutment portion 43a coaxially fixed with a handle 43c. The handle 43c is columnar, and there is a distance between the handle 43c and the rear boring rod 42. The diameter of the handle 43c is larger than the outer diameter of the pull rod 43, so that the end of the handle 43c facing the through hole 42a forms a striking surface 43d for the hammer to strike. After the pull rod 43 is separated from the front boring bar 41 by screwing, the tapered hole 41a and the tapered boss 42b are still in a tightly connected state due to the interference fit. At this time, it is only necessary to use a hammer or other tool to knock the knocking surface 43d of the handle 43c to transfer the force of the hammer to the abutment portion 43a, so that the tapered hole 41a and the tapered boss 42b are separated, and then the handle 43c of the pull rod 43 is pulled by hand to separate the front boring bar 41 and the rear boring bar 42. In order to facilitate the screwing of the pull rod 43, the cross section of the handle 43c at one end of the pull rod 43, the cross section of the handle 43c and the cross section of the abutment portion 43a can all adopt a polygonal structure such as a regular hexagon.

[0036] Furthermore, a weight-reducing hole 41c is axially opened in the front boring bar 41, and the weight-reducing hole 41c is connected to the threaded hole 41b. This not only reduces the weight of the front boring bar 41 while ensuring the structural strength of the front boring bar 41, but also enables the air in the tapered hole 41a to enter the weight-reducing hole 41c through the threaded hole 41b when the tapered hole 41a is plugged into the tapered boss 42b, thereby avoiding the air from affecting the fit between the tapered hole 41a and the tapered boss 42b.

[0037] In this embodiment, the boring tool 5 includes an annular cutter disc 51 and cutter heads 52 spaced apart along the circumference of the cutter disc 51 , wherein the cutter disc 51 is sleeved and fixed on one end of the front boring bar 41 close to the rear boring bar 42 .

[0038] like Figures 5 to 10As shown, the boring die 3 includes a base 33, an inner support seat 31 and an outer support seat 32, wherein the base 33 is arranged at one end of the frame 1, and the inner support seat 31 and the outer support seat 32 are arranged at intervals at both ends of the base 33 along the length direction of the boring bar 4, and the inner support seat 31 is located at the end close to the power device 2, and the outer support seat 32 is located at the end away from the power device 2. A plurality of height-adjustable supports 33a for supporting the workpiece 8 are arranged at intervals on the upward end surface of the base 33, and the supports 33a are all located between the inner support seat 31 and the outer support seat 32. In this embodiment, there are four supports 33a and they are distributed in a square shape. The inner support seat 31 and the outer support seat 32 are provided with relatively arranged axial holes 3a, and the positions and the number of the axial holes 3a correspond to the prefabricated holes of the workpiece 8. In the present embodiment, the workpiece 8 is the pump body of a twin-screw pump, and therefore the number of the axial holes 3a on the inner support seat 31 and the outer support seat 32 are both two. The front boring rod 41 is passed through the axial hole 3a of the inner support seat 31, and the rear boring rod 42 is passed through the axial hole 3a of the outer support seat 32. In order to ensure the accuracy and smooth movement of the front boring rod 41 and the rear boring rod 42, the front boring rod 41 and the rear boring rod 42 are respectively matched with the axial hole 3a through the bearing shell 3b.

[0039] A plurality of positioning blocks 71 are provided on the end surface of the outer support seat 32 facing the inner support seat 31. The positioning blocks 71 are arranged at intervals around the shaft hole 3a. In this embodiment, the number of positioning blocks 71 is three. Of course, the number and shape of the positioning blocks 71 can be designed according to the actual shape of the workpiece 8. The inner support seat 31 is provided with a plurality of ejector rod assemblies 6 and a plurality of guide holes 31a corresponding to the ejector rod assemblies 6. The guide holes 31a are also arranged along the axial direction of the boring bar 4 and distributed around the shaft hole 3a. Fig.10 As shown, the push rod assembly 6 includes a push rod 61, a screw rod 62 and a guide sleeve 63. The push rod 61 is inserted into the guide hole 31a and one end of the push rod 61 toward the outer support seat 32 extends out of the guide hole 31a. A cavity for accommodating the boring tool 5 is formed between the ends of each push rod 61 extending out of the outer support seat 32. The guide sleeve 63 is fixed to the side of the inner support seat 31 away from the outer support seat 32 and is coaxial with the guide hole 31a. The screw rod 62 is threadedly connected to the guide sleeve 63 and is coaxially connected to the push rod 61. By screwing the screw 62, the push rod 61 can be driven to move forward and backward along the length direction of the guide hole 31a, thereby cooperating with the positioning block 71 to clamp or release the workpiece 8.

[0040] Further, such as Figure 8As shown, the end surface of the positioning block 71 facing the push rod assembly 6 is provided with a mounting groove 71a, and a positioning pin 72 and a spring 74 for pushing the positioning pin 72 outward are provided in the mounting groove 71a. A pressure cover 73 for covering the mounting groove 71a is also fixed in the mounting groove 71a, and a clearance hole is provided on the pressure cover 73. One end of the positioning pin 72 passes through the clearance hole and extends out of the mounting groove 71a. At the same time, the pressure cover 73 can also limit the positioning pin 72 to prevent the positioning pin 72 from being separated from the mounting groove 71a. In this way, after the workpiece 8 is placed and the push rod 61 is not fixed in place, the positioning pin 72 can form a certain pre-tightening force with the push rod 61 to prevent the workpiece 8 from sliding during the fixing process, thereby ensuring the positioning accuracy of the workpiece 8.

[0041] When the boring machine processes the workpiece 8, the front boring bar 41 and the rear boring bar 42 are first separated, the power device 2 moves in a direction away from the outer support seat 32 and drives the front boring bar 41 to move, so that the boring tool 5 on the front boring bar 41 enters the cavity between the ejector rods 61, and the rear boring bar 42 is manually pulled and also moves in a direction away from the front boring bar 41, so that a space sufficient for the workpiece 8 to be placed is formed between the inner support seat 31 and the outer support seat 32, and then the workpiece 8 is placed on each support 33a, one of the end faces of the workpiece 8 is abutted against the positioning block 71 on the outer support seat 32, and the inner support seat 31 is adjusted. The screw rod 62 is used to make the push rod 61 abut against the other end face of the workpiece 8 and fix the workpiece 8, and then the rear boring bar 42 is moved toward one end of the front boring bar 41, so that the rear boring bar 42 passes through the prefabricated hole of the workpiece 8 and is plugged with the front boring bar 41, and then the pull rod 43 is screwed to form a stable fixed connection between the front boring bar 41 and the rear boring bar 42, so that the fixation of the workpiece 8 and the installation of the boring bar 4 are completed. At this time, it is only necessary to drive the power device 2 to rotate the boring bar 4 while transmitting the feed force moving toward one end of the outer support seat 32 to the boring bar 4, so that the boring cutter 5 on the boring bar 4 can bore the prefabricated hole of the workpiece 8. Similarly, after the processing is completed, the pull rod 43 is screwed to separate the pull rod 43 from the front boring bar 41, and then the knocking surface 43d of the handle 43c is struck with a hammer to separate the front boring bar 41 from the rear boring bar 42. After the front boring bar 41 and the rear boring bar 42 are pulled out of the workpiece 8, the push rod 61 is loosened to remove the workpiece 8.

[0042] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0043] Although the terms such as frame 1, power device 2, boring die 3, inner support seat 31, outer support seat 32, base 33, boring bar 4 are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A boring machine, comprising a frame (1), a boring bar (4), a power device (2) slidably arranged on the frame (1), and a boring die (3) arranged opposite to the power device (2) and used to fix a workpiece (8), wherein the boring die (3) comprises an inner support seat (31) and an outer support seat (32) arranged at intervals, characterized in that: The boring bar (4) comprises a front boring bar (41) and a rear boring bar (42) which are detachably coaxially plugged in. The front boring bar (41) is inserted into the inner support seat (31), and the rear boring bar (42) is inserted into the outer support seat (32). One end of the front boring bar (41) is connected to the output shaft of the power device (2). The rear boring bar (42) is provided with a through hole (42a) along the axial direction, and a pull rod (43) is inserted into the through hole (42a). Both ends of the pull rod (43) extend out of the through hole (42a). One end of the pull rod (43) has an external thread and is threadedly connected to the front boring bar (41). The other end of the pull rod (43) has a contact portion (43a) for contacting the end face of the rear boring bar (42). The front boring bar (41) is close to the rear boring bar (41). A boring tool (5) is provided on the circumference of one end of the rod (42), the boring tool (5) comprising an annular cutter disc (51) and cutter heads (52) arranged at intervals along the circumference of the cutter disc (51), the cutter disc (51) being sleeved and fixed on one end of the front boring rod (41) close to the rear boring rod (42); a conical hole (41a) is provided on the end surface of the front boring rod (41) facing the rear boring rod (42), a threaded hole (41b) threadedly connected to the pull rod (43) is provided at the bottom of the conical hole (41a), and a conical boss (42b) interference-fitted with the conical hole (41a) is provided on the end surface of the rear boring rod (42) facing the front boring rod (41); the inner support seat (31) and the outer support seat (32) respectively have axial holes (3a) arranged opposite to each other, and the A plurality of positioning blocks (71) are provided on the end surface of the outer support seat (32) facing the inner support seat (31), the positioning blocks (71) are arranged at intervals around the shaft hole (3a), and the inner support seat (31) is provided with a plurality of push rod assemblies (6) that cooperate with the positioning blocks (71) and are used to clamp the workpiece (8), the push rod assemblies (6) are arranged at intervals around the shaft hole (3a) and protrude toward one side of the outer support seat (32); a plurality of guide holes (31a) corresponding to the push rod assemblies (6) are opened on the inner support seat (31), the push rod assembly (6) comprises a push rod (61), a screw rod (62) and a guide sleeve (63), the push rod (61) is inserted into the guide hole (31a) and one end of the push rod (61) toward the outer support seat (32) protrudes out of the guide hole (31a). A cavity for accommodating a boring tool (5) is formed between one end of each of the push rods (61) extending out of the outer support seat (32) outward from the hole (31a); the guide sleeve (63) is fixedly arranged on a side of the inner support seat (31) away from the outer support seat (32) and is coaxial with the guide hole (31a); the screw rod (62) is threadedly connected to the guide sleeve (63) and is coaxially connected to the push rod (61); the boring die (3) further comprises a base (33); the inner support seat (31) and the outer support seat (32) are both fixedly arranged on the base (33); a plurality of supports (33a) with adjustable heights and used for supporting a workpiece (8) are arranged at intervals on the upward end surface of the base (33); the supports (33a) are all located between the inner support seat (31) and the outer support seat (32);The positioning block (71) has an installation groove (71a) on its end surface facing the push rod assembly (6), a positioning pin (72) and a spring (74) for pushing the positioning pin (72) outward are arranged in the installation groove (71a), a pressure cover (73) for covering the installation groove (71a) is also fixed in the installation groove (71a), a clearance hole is arranged on the pressure cover (73), and one end of the positioning pin (72) passes through the clearance hole and protrudes out of the installation groove (71a). ; 2. The boring machine according to claim 1, characterized in that: The pull rod (43) is in the shape of a long column, the diameter of the pull rod (43) is smaller than the inner diameter of the through hole (42a), and the outer diameter of the abutment portion (43a) is larger than the inner diameter of the through hole (42a).

3. The boring machine according to claim 2, characterized in that: The length of the tapered hole (41a) is greater than the length of the tapered boss (42b); one end of the pull rod (43) threadedly connected to the front boring rod (41) is also sleeved and fixed with a retaining ring (43b); the retaining ring (43b) is located outside the through hole (42a) and the outer diameter of the retaining ring (43b) is greater than the inner diameter of the through hole (42a).

4. The boring machine according to claim 3, characterized in that: The pull rod (43) has an end portion of a supporting portion (43a) coaxially fixedly connected to a handle (43c), the handle (43c) is columnar, and there is a distance between the handle (43c) and the rear boring bar (42). The diameter of the handle (43c) is larger than the outer diameter of the pull rod (43), so that the end of the handle (43c) facing the through hole (42a) forms a striking surface (43d) for being struck by a hammer.

5. The boring machine according to claim 1, 2, 3 or 4, characterized in that: A weight-reducing hole (41c) is axially opened in the front boring bar (41), and the weight-reducing hole (41c) is connected to the threaded hole (41b).

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