Boring tool for large workpieces

Abstract

The application aims to provide a large workpiece and outer diameter size large circle tooling capable of boring, comprising a machine tool spindle concentric with the shaft center in the horizontal direction, a rotating shaft coaxially connected to the front end of the machine tool spindle, the rotating shaft and the machine frame forming a rotating fit, the front end of the rotating shaft being provided with a chuck, and the chuck being clamped with a boring tool assembly. In the above scheme, the most commonly used machine tool in production is directly added with a rotating shaft and a chuck on the machine tool spindle, the cost is low, the machine tool spindle only needs to provide rotating torque and moving power, and does not need to bear the weight of the tool bar and the tool, and the torque and the weight generated during processing are transmitted to the guide rail and the base by the shell and the bearing, the size of the rotating shaft and the chuck is set according to the size of the cutting force, the bearing capacity is large, and a very large circle can be bored.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machining equipment, in particular to a large part boring outer circle tool. BACKGROUND

[0002] The boring machine is mainly used for boring the pre-existing hole of the workpiece by boring cutter. The boring cutter rotates as the main movement, and the boring cutter or the movement of the workpiece is the feeding movement. It is mainly used for machining high-precision holes or completing the machining of multiple holes in one positioning. In addition, it can also be used for machining other machining surfaces (such as threads, outer circle surfaces and end surfaces) related to hole machining. For a general boring machine, when machining the outer circle of a large workpiece, on the one hand, the original chuck size on the machine tool is too small to adapt to the machining of the outer circle of the large workpiece. If a large-size chuck is directly added to the rotating shaft, the boring cutter assembly on the chuck is eccentrically arranged relative to the rotating shaft and the eccentric distance is too large, and the force arm is too large. The boring head bearing cannot bear such a large cutting force, which may cause the risk of bearing collapse and rotating shaft deformation. If the entire boring machine is processed to be very large, although it can meet the large cutting force generated during machining, it also greatly increases the cost. SUMMARY

[0003] The purpose of the present application is to provide a boring outer circle tool for large workpieces which can bore large-size outer circles and has large bearing capacity.

[0004] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: a boring outer circle tool for large workpieces, comprising a machine tool spindle with the shaft center located in the horizontal direction, a rotating shaft coaxially connected to the front end of the machine tool spindle, the rotating shaft and the machine frame forming a rotating fit, a chuck provided at the front end of the rotating shaft, and a boring cutter assembly clamped forward on the chuck.

[0005] In the above-mentioned scheme, the most commonly used machine tool in production is directly added with a rotating shaft and a chuck on the machine tool spindle, which has low cost. The machine tool spindle only needs to provide torque, and the bending moment generated during machining is borne by the rotating shaft and the chuck. The size of the rotating shaft and the chuck is set according to the size of the cutting force borne, and the bearing capacity is large, which can bore a large outer circle. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 It is a front view of the present application;

[0007] Figure 2 It is a left view of the present application;

[0008] Figure 3 It is a front view of the stand. DETAILED DESCRIPTION

[0009] As Figures 1-3As shown, a large workpiece boring outer circle tooling, including the shaft center is located in the horizontal direction machine tool spindle 10, the front end of machine tool spindle 10 coaxially connected with the shaft 20, the shaft 20 and the frame 30 constitute rotating fit, the front end of the shaft 20 is provided with chuck 40, the chuck 40 is provided with boring cutter assembly 50 to the front side. For large workpiece, its outer circle diameter is big, length is long, if directly on the shaft plus big diameter chuck, because the boring cutter assembly on the chuck is eccentric distance too big relative to the shaft, so in cutting, to bear a very big cutting force, plus the length of large workpiece is too long, so the force arm of boring cutter assembly also need to be set very long, in processing, boring machine shaft to bear a very big torsion, very easy to appear the risk of shaft deformation. Therefore, in this application, the most commonly used machine tool in production is directly added to the machine tool spindle 20 and chuck 40, the cost is low, the machine tool spindle 10 only needs to provide torque, while machining workpiece outer circle, the bending moment generated by the shaft 20 and chuck 40, and the size of the shaft 20 and chuck 40 can be set according to the size of the cutting force, the carrying capacity is large, which can bore very big outer circle.

[0010] Because the length of large workpiece in its axial direction is very long, boring cutter assembly 50 can move in its axial direction, the frame 30 includes a cylindrical shell 31 which is sleeved on the outer circumference of the shaft 20, a set of conical bearings 100 is arranged at each end of the inner cavity of the cylindrical shell 31 and constitutes rotating fit with the shaft 20, the conical bearings 100 have high guiding accuracy and large carrying capacity, the bottom of the cylindrical shell 31 extends downwardly to have a connecting frame 32, the lower end of the connecting frame 32 constitutes sliding fit with the base 60 in the shaft center direction of the shaft 20, and the connecting frame 32 is further provided with a locking unit for locking the relative position of the two. The power mechanism drives the connecting frame 32 to slide along the base 60, and the cylindrical shell 31 and its accessories fixedly connected with the connecting frame 32 will move synchronously, thereby boring each part of the outer periphery of the large workpiece.

[0011] As shown in Figure 1 , Figure 2 The specific structure is that the bottom of the connecting frame 32 is provided with two sliding grooves 33 which are open downward, the length direction of the sliding grooves 33 is parallel to the shaft center direction of the shaft 20, the base 60 is provided with two guide rails 61 at the corresponding position of the sliding grooves 33, the sliding grooves 33 are clamped on the guide rails 61 and constitute sliding fit in the length direction of the sliding grooves 33, the two guide rails 61 ensure the stability of the movement of the connecting frame 32 and also ensure the guiding accuracy.

[0012] As a preferred scheme of the present application, the connecting frame 32 is fixedly connected with the machine tool main shaft 10 through the transition support 70 and the machine box 80 outside the periphery of the machine tool main shaft 10, and the power mechanism drives the machine box 80 to drive the sliding slot 33 on the connecting frame 32 to move linearly along the guide rail 61. The machine tool main shaft 10 and the machine box 80 are rotatable relative to each other, and the machine box 80 on the machine tool can move linearly along the track provided on the machine tool bed. Therefore, the connecting frame 32 is fixedly connected with the machine box 80, and the machine box 80 moves on the track on the machine tool bed to drive the connecting frame 32 to move along the guide rail 61, so as to realize the forward and backward movement of the boring tool assembly 50. The machine tool main shaft 10 and the machine box 80 are rotatably connected, so the transmission of the torque from the machine tool main shaft 10 to the rotating shaft 20 is not affected, and the rotating shaft 20 can be driven to move synchronously, so as to improve the precision.

[0013] The transition support 70 includes a bottom plate 71 in a horizontal plane and a vertical plate 72 in a vertical plane. The front end of the bottom plate 71 is fixedly connected with the rear end of the sliding slot 33 through bolts, and the rear end of the bottom plate 71 is fixedly connected with the lower end of the vertical plate 72 through an angle steel 73. The upper end of the vertical plate 72 is a semicircular plate with an opening upward, which is clamped on the periphery of the machine tool main shaft 31 and fixedly connected with the machine box 80. The thrust on the machine box 80 is directly transmitted to the sliding slot 33 through the vertical plate 72, the angle steel 73 and the bottom plate 71, so as to ensure the stability of the axial movement of the frame 30.

[0014] A shaft coupling 90 is arranged between the rear end of the rotating shaft 20 and the front end of the machine tool main shaft 10. The front half of the shaft coupling 90 is fixedly connected with the rear end of the rotating shaft 20 through bolts, and the rear half is fixedly connected with the front end of the machine tool main shaft 10 through bolts. The front half and the rear half are connected through a nylon rod, so as not to damage the precision of the machine tool and affect the machining precision of the workpiece.

[0015] The chuck 40 is disc-shaped and coaxial with the rotating shaft 20. A plurality of mounting holes 41 are uniformly and spacedly arranged on the disc surface of the chuck 40 in the circumferential direction. The hole center of the mounting hole 41 is parallel to the disc center of the chuck 40. The boring tool assembly 50 is fixedly connected in the mounting hole 41 through bolts.

[0016] The boring tool assembly 50 includes a tool holder 51 fixedly connected with the chuck 40. The rear end of a tool bar 52 is fixedly connected with the tool holder 51, and a boring head 53 is connected with the front end of the tool bar 52. The bar center of the tool bar 52 is parallel to the shaft center direction of the rotating shaft 20 and is eccentrically arranged. The tool holder 51 moves on the chuck 40 to coarsely adjust the position of the boring head 53. After moving to the approximate position, the boring head 53 is pressed tightly, and then the boring head 53 is finely adjusted to control the precision within 0.01 mm.

[0017] In order to ensure that the rotating shaft 20 can provide sufficient bending moment and strength, the diameter of the rotating shaft 20 is greater than the diameter of the machine tool main shaft 10, and the diameter of the chuck 40 is greater than the diameter of the rotating shaft 20. The specific size is finally determined by calculation in combination with the cutting force required when boring the external circle.

Claims

1. A large workpiece's boring tooling, comprising a machine tool spindle (10) whose shaft center is located in the horizontal direction, characterized in that: The front end of the machine tool spindle (10) is coaxially connected with a rotating shaft (20), the rotating shaft (20) is in rotating cooperation with a frame (30), and the front end of the rotating shaft (20) is provided with a chuck (40), and the chuck (40) is clamped with a boring tool assembly (50) to the front side. The frame (30) comprises a cylindrical shell (31) sleeved on the outer periphery of the rotating shaft (20), a set of conical bearings (100) are arranged at both ends of the inner cavity of the cylindrical shell (31) and are in rotating cooperation with the rotating shaft (20), the bottom of the cylindrical shell (31) extends downward with a connecting frame (32), the lower end of the connecting frame (32) is in sliding cooperation with the frame (30) in the axial center direction of the rotating shaft (20), and the connecting frame (32) is further provided with a locking unit for locking the relative positions of the frame (30) and the connecting frame (32). A shaft coupling (90) is arranged between the rear end of the rotating shaft (20) and the front end of the machine tool spindle (10), the front half of the shaft coupling (90) is fixed to the rear end of the rotating shaft (20) by bolts, the rear half is fixed to the front end of the machine tool spindle (10) by bolts, and the front half and the rear half are connected by a nylon rod.

2. The large workpiece bore-on-cylindrical work fixture of claim 1 wherein: The bottom of the connecting frame (32) is provided with a slide groove (33) opening downward at both sides, the length direction of the slide groove (33) is parallel to the axial center direction of the rotating shaft (20), and the base (60) is provided with two guide rails (61) corresponding to the slide groove (33), the slide groove (33) is clamped on the guide rail (61) and is in sliding cooperation in the length direction of the slide groove (33).

3. The large workpiece bore-on-outer-diameter tooling of claim 1, wherein: The connecting frame (32) is fixedly connected with the machine box (80) on the outer periphery of the machine tool spindle (10) through the transition support (70), and the power mechanism drives the machine box (80) to drive the slide groove (33) on the connecting frame (32) to move linearly along the guide rail (61).

4. The large workpiece bore-on-cylindrical work fixture of claim 3 wherein: The transition support (70) comprises a bottom plate (71) in a horizontal plane and a vertical plate (72) in a vertical plane, the front end of the bottom plate (71) is fixed to the rear end of the slide groove (33) by bolts, the rear end of the bottom plate (71) is fixed to the lower end of the vertical plate (72) by an angle steel (73), the upper end of the vertical plate (72) is a semicircular plate opening upward, and the semicircular plate is clamped on the outer periphery of the machine tool spindle (10) and is fixedly connected with the machine box (80).

5. The large workpiece bore-on-outer-diameter tooling of claim 1 wherein: The chuck (40) is disc-shaped and the disc center is collinear with the rotating shaft (20), a plurality of mounting holes (41) are uniformly and interval arranged on the disc surface of the chuck (40) along the circumferential direction, the hole center of the mounting hole (41) is parallel to the disc center of the chuck (40), and the boring tool assembly (50) is fixed in the mounting hole (41) by bolts.

6. The large workpiece bore-on-cylindrical work fixture of claim 5 wherein: The boring tool assembly (50) comprises a tool holder (51) fixed with the chuck (40), the rear end of a tool rod (52) is fixed with the tool holder (51), the front end is connected with a boring head (53), the rod center of the tool rod (52) is parallel to the axial center direction of the rotating shaft (20) and is eccentrically arranged.

7. The apparatus for boring the outer circle of a large workpiece according to any one of claims 1 to 6, characterized in that: The diameter of the rotating shaft (20) is greater than the diameter of the machine tool spindle (10), and the diameter of the chuck (40) is greater than the diameter of the rotating shaft (20).

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