PCD (Poly Crystal Diamond) excircle cutter

Abstract

The utility model discloses a PCD (Poly Crystal Diamond) excircle cutter, which relates to the field of excircle cutters and comprises a cutter bar, one end of the cutter bar is connected with a cutter grain, the cutter bar is fixed on a clamp, the bottom end of the clamp is fixedly connected with a rotating shaft, the axis of the rotating shaft is collinear with the straight line of the edge of the cutter grain, and the rotating shaft is rotatably connected onto a rotating seat which is slidably connected onto a longitudinal feeding seat. The longitudinal feeding base is connected to the transverse feeding base in a sliding mode, the end of a cutter bar clamped by the clamp is coaxial with a rotating shaft, the rotating shaft is fixed to a rotating plate, the rotating plate is connected with a rotating disc through a hydraulic cylinder and a piston rod, and the angle of a cutter head can be adjusted within a certain range by rotating the rotating plate. The straight line where the end portion of the tool bit is located is tangent to the cutting face of a cut workpiece in different feeding directions, and it is guaranteed that the stress direction of the tool grains is stable.

Description

Technical Field

[0001] The utility model relates to the field of external round cutters, in particular to a PCD external round cutter. Background Art

[0002] PCD cutters, namely diamond cutters, have the advantages of high hardness and high temperature resistance. External round cutters are used for external round cutting lathes. The principle is to use a chuck to fix the workpiece to be cut and drive the workpiece to rotate at a high speed. The high-speed rotating workpiece contacts the cutter to complete cutting.

[0003] The end parts of a conventional external round cutter all meet the cutting strength requirements. However, PCD external round cutters are suitable for workpieces with higher requirements for cutter hardness, and rely on the contact between the cutting grains and the workpiece to achieve cutting. Since there are only relatively small cutting grains, if it is necessary to cut the workpiece obliquely to the axis direction, such as cutting along the side surface of a frustum of a cone, the existing cutters and fixtures do not have the function of adjusting the feed angle. Summary of the Utility Model

[0004] In order to make up for the deficiencies of the existing technology, the purpose of the utility model is to provide a PCD external round cutter. The fixture is connected to the rotating seat, and the cutting grain edge at the end of the tool bar connected by the fixture and the rotating shaft are on the same axis. By adjusting the rotating seat, the tool head angle of the tool bar can be changed, so as to adapt to the feed angle, and it can be adjusted during the cutting process.

[0005] In order to solve the problems of the existing technology, the technical solution of the utility model is as follows:

[0006] A PCD external round cutter includes a tool bar. One end of the tool bar is connected with a cutting grain. The tool bar is fixed on a fixture. The bottom end of the fixture is fixedly connected with a rotating shaft. The axis of the rotating shaft is collinear with the straight line where the cutting grain edge is located. The rotating shaft is rotatably connected to a rotating seat. The rotating seat is slidably connected to a longitudinal feed seat. The longitudinal feed seat is slidably connected to a transverse feed seat.

[0007] Preferably, a tool groove is arranged on the side surface of the fixture. A locking bolt is threadedly connected to the upper side of the tool groove. The locking bolt penetrates through the upper side of the tool groove. A wrench hole is arranged on the side surface of the locking bolt.

[0008] Preferably, the fixture is fixedly connected to a rotating plate. The rotating shaft is fixedly connected to the rotating plate. A piston rod is fixedly connected to the rotating plate. The piston rod is inserted into a hydraulic cylinder fixed on the rotating seat.

[0009] Preferably, the piston rod and the hydraulic cylinder are arc-shaped rods centered on the rotating shaft. The cross-section of the piston rod is circular. A shaft hole for inserting the rotating shaft is arranged on the rotating seat.

[0010] Preferably, a first sliding groove is arranged at the bottom of the rotating seat. A longitudinal guide rail is slidably connected in the first sliding groove. There are two longitudinal guide rails. The two longitudinal guide rails are fixed by a first seat plate.

[0011] Preferably, a longitudinal feed motor is arranged above the first seat plate. The output shaft of the longitudinal feed motor is coaxially and fixedly connected to a longitudinal feed screw rod, and the longitudinal feed screw rod is in threaded connection with a threaded sleeve at the bottom of the rotating seat.

[0012] Preferably, a second sliding groove is arranged below the longitudinal feed seat. A transverse guide rail is slidably connected in the second sliding groove. There are two transverse guide rails, and the two transverse guide rails are fixed by a second seat plate.

[0013] Preferably, a transverse feed motor is fixedly connected to the second seat plate. The output shaft of the transverse feed motor is coaxially and fixedly connected to a transverse feed screw rod, and the transverse feed screw rod is in threaded connection with a threaded sleeve below the longitudinal feed seat.

[0014] Compared with the prior art, the advantages of the present utility model are as follows:

[0015] 1. The end of the tool shank clamped by the fixture of the present utility model is coaxial with the rotating shaft. The rotating shaft is fixed on the rotating plate, and the rotating plate is connected to the rotating disk through a hydraulic cylinder and a piston rod. By rotating the rotating plate, the angle of the tool head can be adjusted within a certain range, so that the straight line where the end of the tool head is located is tangent to the cutting surface of the workpiece to be cut in different feed directions, ensuring the stability of the force direction on the cutting insert.

[0016] 2. The rotating disk is slidably connected to the longitudinal feed seat, and the longitudinal feed seat is slidably connected to the transverse feed seat. Through the cooperation of the two feeds, inclined feeding is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present utility model;

[0018] Figure 2 is a schematic structural diagram of the rotating plate and the rotating seat of the present utility model;

[0019] Figure 3 is a connection diagram of the longitudinal feed seat and the transverse feed seat of the present utility model;

[0020] Reference numerals: 1. Tool shank; 11. Cutting insert; 2. Fixture; 21. Locking bolt; 3. Rotating seat; 31. Hydraulic cylinder; 32. First sliding groove; 4. Rotating plate; 41. Rotating shaft; 42. Piston rod; 5. Longitudinal feed seat; 51. Longitudinal guide rail; 52. Longitudinal feed motor; 53. Longitudinal feed screw rod; 54. First seat plate; 55. Second sliding groove; 6. Transverse feed seat; 61. Transverse guide rail; 62. Transverse feed motor; 63. Transverse feed screw rod; 64. Second seat plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0022] As Figures 1-3 shown, for a PCD external round tool, during assembly, the tool shank 1 is placed in the tool groove on the fixture 2, such that the straight line where the edge of the cutting particle 11 at the end of the tool shank 1 is located coincides with the straight line where the rotating shaft 41 is located. As Figure 2 shown in the figure, the cutting particle is made of PCD material. After the position of the tool shank 1 is determined, the bottom end of the fastening lock bolt 21 is made to abut against the side surface of the tool shank 1 through the fastening lock bolt 21, so that the tool shank 1 is fixed to the fixture 2. Then, the hydraulic cylinder 31 is connected to the hydraulic system to precisely control the liquid flow rate in the hydraulic cylinder 31 and control the rotation angle between the rotating plate 4 and the rotating base 3, thereby determining the inclination angle of the tool head at the end of the tool shank 1. When adjusting the inclination angle of the end of the tool head, hydraulic liquid enters or exits the hydraulic cylinder, the piston rod 42 slides in the hydraulic cylinder 31, and the rotating plate 4 fixedly connected to the piston rod 42 rotates relative to the rotating base 3 with the axis of the rotating shaft 41 as the center, thereby adjusting the inclination angle of the tool head. In cooperation with the longitudinal feed base 5 and the transverse feed base 6 for feeding in the inclined direction, the tool head feeds tangentially to the workpiece cutting surface, and the cutting particle 11 is always stressed in the same direction, avoiding affecting the connection stability between the tool shank 1 and the cutting particle 11.

[0023] A first sliding groove 32 is provided below the rotating base 3, and a longitudinal guide rail 51 is slidably connected in the first sliding groove 32. When adjusting the longitudinal position of the tool shank 1, the longitudinal feed motor 52 rotates, and the longitudinal feed screw rod 53 fixedly connected coaxially with the output shaft of the longitudinal feed motor 52 rotates. The longitudinal feed screw rod 53 is threadedly connected to the threaded sleeve fixedly connected to the bottom end of the rotating base 3. Therefore, the rotating base 3 can be made to slide along the longitudinal guide rail 51. The two longitudinal guide rails 51 are fixedly connected through the first base plate 54 to achieve longitudinal adjustment of the position of the tool shank 1. A second sliding groove 55 is provided at the bottom of the first base plate 54, and a transverse guide rail 61 is slidably connected in the second sliding groove 55. The two transverse guide rails 61 are fixedly connected through the second base plate 64. A transverse feed motor 62 is fixedly connected to the second base plate 64. The output shaft of the transverse feed motor 62 is fixedly connected coaxially with the transverse feed screw rod 63. The transverse feed screw rod 63 is threadedly connected to the threaded sleeve fixedly connected to the bottom of the first base plate 54, causing the longitudinal feed base 5 and the rotating base 3, fixture 2, and tool shank 1 connected thereto to move transversely. The longitudinal movement is combined with the transverse movement, enabling the tool shank 1 to feed at any angle on the plane.

[0024] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A PCD external circular cutter, characterized in that: The invention comprises a knife rod (1), one end of which is connected to a knife particle (11), the knife rod (1) is fixed on a clamp (2), the bottom end of which is fixedly connected to a rotating shaft (41), the axis of which is colinear with a straight line where the edge of the knife particle (11) is located, the rotating shaft (41) is rotatably connected to a rotating seat (3), the rotating seat (3) is slidably connected to a longitudinal feed seat (5), and the longitudinal feed seat (5) is slidably connected to a transverse feed seat (6).

2. A PCD external circular cutter according to claim 1, characterized in that: A knife groove is arranged on the side of the clamp (2), a locking bolt (21) is threadedly connected to the upper side of the knife groove, the locking bolt (21) passes through the upper side of the knife groove, and a wrench hole is arranged on the side of the locking bolt (21).

3. A PCD external circular cutter according to claim 1, characterized in that: The clamp (2) is fixedly connected to the rotating plate (4), the rotating shaft (41) is fixedly connected to the rotating plate (4), the rotating plate (4) is fixedly connected to a piston rod (42), and the piston rod (42) is plugged into a liquid cylinder (31) fixed on the rotating seat (3).

4. A PCD external circular cutter according to claim 3, characterized in that: The piston rod (42) and the hydraulic cylinder (31) are arc rods with the rotating shaft (41) as the center. The cross section of the piston rod (42) is circular. The rotating seat (3) is provided with an axial hole plugged with the rotating shaft (41).

5. A PCD external circular cutter according to claim 1, characterized in that: The bottom of the rotating seat (3) is provided with a first sliding groove (32), and a longitudinal guide rail (51) is slidably connected in the first sliding groove (32). There are two longitudinal guide rails (51), and the two longitudinal guide rails (51) are fixed by a first seat plate (54).

6. A PCD external circular cutter according to claim 5, characterized in that: A longitudinal feed motor (52) is arranged above the first seat plate (54); an output shaft of the longitudinal feed motor (52) is coaxially fixedly connected to a longitudinal feed screw rod (53); and the longitudinal feed screw rod (53) is threadedly connected to a threaded sleeve at the bottom of the rotating seat (3).

7. A PCD external circular cutter according to claim 1, characterized in that: A second slide groove (55) is arranged below the longitudinal feed seat (5), and a transverse guide rail (61) is slidably connected in the second slide groove (55). There are two transverse guide rails (61) and the two transverse guide rails (61) are fixed by a second seat plate (64).

8. A PCD external circular cutter according to claim 7, characterized in that: The second seat plate (64) is fixedly connected to a transverse feed motor (62); an output shaft of the transverse feed motor (62) is coaxially fixedly connected to a transverse feed screw rod (63); and the transverse feed screw rod (63) is threadedly connected to a threaded sleeve below the longitudinal feed seat (5).

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