Self-centering tailstock mechanism of worm whirlwind milling machine

Abstract

The utility model provides a self-centering tailstock mechanism of a worm whirlwind milling machine, and belongs to the technical field of worm machining equipment. The problems that a tailstock of an existing automatic whirlwind milling machine is prone to colliding with a whirlwind milling head, and the fixing effect on a workpiece is poor are solved. According to the self-centering tailstock mechanism of the worm whirlwind milling machine, the whirlwind milling machine comprises a machine tool body, a machine tool spindle and a whirlwind milling head, a carriage capable of transversely moving relative to the machine tool spindle is arranged on the machine tool body, and a moving table capable of vertically moving relative to the carriage and used for installing the whirlwind milling head is arranged on the carriage. The self-centering tailstock mechanism comprises a center, a mounting seat and a driving part, the center is mounted on the mounting seat, the driving part is arranged on the carriage, and the driving part is connected with the mounting seat and used for driving the mounting seat to transversely move in a reciprocating mode. The device is ingenious in design, collision with the whirlwind milling head can be avoided, the stability of a workpiece during machining can be guaranteed, and the machining precision of the workpiece is higher.

Description

TECHNICAL FIELD

[0001] The utility model belongs to worm processing equipment technical field relates to a worm whirlwind milling machine's self centering tailstock mechanism. BACKGROUND

[0002] The whirlwind milling machine is a kind of special equipment for processing worm, one side clamps workpiece to carry out low-speed feed movement, one side drives cutter high-speed rotation through whirlwind milling head mechanism, and makes the thread on workpiece cutting.

[0003] In order to avoid workpiece deformation or vibration when processing, ensure the machining accuracy of workpiece, usually need to set up tailstock in the tail of workpiece to assist, such as the copper pipe processing whirlwind milling surface device disclosed in Chinese patent application (application No.202020491054.3), including headstock, body, center frame, whirlwind milling head, tailstock, when processing, one end of workpiece is fixed through headstock, and the other end is fixed through tailstock cooperation. With the continuous progress of technology, more and more whirlwind milling machines are designed to be automatic, and the height of the bed of the automatic whirlwind milling machine is usually designed to be low, so that the whirlwind milling head has a larger range of movement, which leads to the tailstock needing to be designed higher, which further leads to the decrease of the rigidity of the tailstock, and the high position makes the center of gravity high, under the action between the center and the workpiece, the tailstock is prone to deviation or deformation, thereby affecting the positioning accuracy of the workpiece;And the existing tailstock design seriously affects the range of movement of whirlwind milling head, when moving whirlwind milling head, tailstock needs to be moved first, to move away from whirlwind milling head, otherwise, collision is prone to occur due to improper operation. SUMMARY

[0004] The utility model aims at the above-mentioned problems existing in prior art, proposes a whirlwind milling machine's self centering tailstock mechanism, and the technical problems to be solved by the utility model are how to improve the positioning accuracy of workpiece in whirlwind milling machine and avoid the collision between tailstock and whirlwind milling head.

[0005] The utility model can be realized by the following technical scheme: a whirlwind milling machine's self centering tailstock mechanism, whirlwind milling machine includes body, machine tool spindle and whirlwind milling head, the body is equipped with the drag board that can move laterally relative to machine tool spindle, the drag board is equipped with the moving platform that can move up and down relative to drag board and is used to install whirlwind milling head, characterized by, the self centering tailstock mechanism includes center, mounting seat and driving part, the center is installed on mounting seat, the driving part is arranged on the drag board, the driving part is connected with mounting seat and is used to drive mounting seat to move laterally reciprocating.

[0006] The utility model discloses a tailstock mechanism is directly arranged on the drag board, makes it keep synchronization when transverse translation with cyclone milling head, avoids the risk of collision. When processing workpiece, drive part first drives tailstock to move to machine tool main shaft side and leans against with workpiece tail, fixes workpiece with machine tool main shaft, then drag board drives cyclone milling head and drive part to feed to machine tool main shaft side, at this moment, drive part can drive tailstock to move to drive part side relative to drag board actively or passively, its moving speed is equivalent with the feed speed of the support plate, makes tailstock keep unmoved relative to machine tool main shaft, guarantees the stability of workpiece, thereby guarantees the processing accuracy of workpiece.

[0007] In the self-centering tailstock mechanism of the worm cyclone milling machine, the drive part is a hydraulic cylinder, and a back pressure valve is arranged on an oil passage of the hydraulic cylinder. The back pressure valve can accurately control the oil pressure in the hydraulic cylinder, so that the drive part can keep a relatively constant pressure between the tailstock and the workpiece. When the drag board drives the cyclone milling head and the drive part to feed to the side of the machine tool main shaft, the pressure between the tailstock and the workpiece increases, the hydraulic oil in the piston rod of the drive part can be discharged through the back pressure valve, and the piston rod is retracted, so that the tailstock keeps unmoved relative to the machine tool main shaft and keeps a stable pressure between the tailstock and the workpiece.

[0008] In the self-centering tailstock mechanism of the worm cyclone milling machine, the mounting seat and the moving table are connected through a cross slide mechanism, which can improve the stability of the mounting seat and the tailstock, and keep the tailstock unmoved relative to the mounting seat and the machine tool main shaft when the moving table moves.

[0009] In the self-centering tailstock mechanism of the worm cyclone milling machine, the cross slide mechanism includes a first slide rail, a first slide seat, a slide table, a second slide rail and a second slide seat. The first slide rail is vertically arranged on the moving table, the slide table is slidably connected with the first slide rail through the first slide seat, the second slide rail is transversely arranged on the slide table, and the second slide seat is slidably connected with the second slide rail and fixedly connected with the mounting seat.

[0010] In the self-centering tailstock mechanism of the worm cyclone milling machine, a mounting bracket is fixedly arranged on the drag board, the drive part is fixedly arranged on the mounting bracket, and one side of the mounting bracket is fixedly connected with the slide table, so as to improve the axial position accuracy and stability of the slide table and the tailstock.

[0011] In the self-centering tailstock mechanism of the worm cyclone milling machine, the tailstock and the drive part are at the same height.

[0012] In the self-centering tailstock mechanism of the worm cyclone milling machine, one side of the mounting seat has a mounting groove one and an outwardly protruding mounting protrusion. The mounting groove one is used for mounting the second slide seat, and the mounting protrusion has a mounting groove two. The mounting groove two is used for mounting the tailstock and is arranged in the same direction with the mounting groove one.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1. This utility model sets the tailstock mechanism on the slide, enabling it to move laterally synchronously with the cyclone milling head, thus avoiding collision between the cyclone milling head and the tailstock mechanism. At the same time, when the slide drives the cyclone milling head and the tailstock mechanism to feed laterally, the center can retract relative to the slide and remain stationary relative to the machine tool spindle, ensuring stable contact with the workpiece to guarantee machining accuracy.

[0015] 2. This utility model has a simple structure and ingenious design. It uses a hydraulic cylinder as the driving component to drive the center and sets a back pressure valve in the oil circuit. This can not only ensure the stability of the pressure between the center and the workpiece, but also keep the center stationary relative to the machine tool spindle when the slide is feeding. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a worm gear milling machine;

[0017] Figure 2 This is a schematic diagram of the structure of this utility model in conjunction with a cyclone milling head;

[0018] Figure 3 This is a structural schematic diagram of the present invention in conjunction with a cyclone milling head from another perspective;

[0019] Figure 4 This is a schematic diagram of the structure of this utility model installed on the slide;

[0020] Figure 5 This is a structural diagram of the mounting base.

[0021] In the diagram, 11. Bed; 12. Loading mechanism; 13. Machine tool spindle; 14. Cyclone milling head; 21. Slide plate; 22. Moving table; 3. Center; 4. Mounting base; 41. Mounting slot one; 42. Mounting protrusion; 43. Mounting slot two; 44. Mounting slot three; 5. Drive component; 6. Mounting bracket; 7. Cross slide mechanism; 71. First slide rail; 72. First slide block; 73. Slide table; 74. Second slide rail; 75. Second slide block. Detailed Implementation

[0022] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0023] Example 1

[0024] A self-centering tailstock mechanism for a worm gear milling machine, such as Figure 1As shown, the worm gear milling machine includes a bed 11, a loading mechanism 12, a machine spindle 13, and a milling head 14. A slide 21, which can move laterally relative to the machine spindle 13, is mounted on the bed 11. A moving table 22, which can move vertically relative to the slide 21, is mounted on the slide 21. The milling head 14 is mounted on the moving table 22, allowing it to move laterally and vertically relative to the bed 11. This invention includes a center point 3, a mounting base 4, and a driving component 5. The driving component 5 is mounted on the slide 21 and fixed relative to it. The center point 3 is mounted on the mounting base 4 and connected to the machine spindle 13. Shaft 13 is located on the same axis. Drive component 5 is connected to mounting base 4 and is used to drive mounting base 4 to move laterally and reciprocally. When fixing the workpiece, drive component 5 can drive center 3 to move towards the side of machine tool spindle 13 and abut against the rear end of the workpiece. When cutting the workpiece, slide 21 drives milling head 14 to feed towards the side of machine tool spindle 13. At the same time, drive component 5 can actively or passively drive center 3 to move backward relative to slide 21. The moving speed is consistent with the feed speed of slide 21, so that center 3 remains stationary relative to machine tool spindle 13 and maintains stable pressure between it and the workpiece.

[0025] Specifically, such as Figures 2 to 4 As shown, the movable platform 22 is slidably connected to the slide plate 21 via a vertically arranged guide rail. A lifting drive mechanism for driving the movable platform 22 to move up and down is provided between the movable platform 22 and the slide plate 21. The drive component 5 is mounted on the slide plate 21 via a mounting bracket 6 and connected to the rear side of the mounting base 4. The mounting base 4 is connected to the movable platform 22 via a cross slide 73 mechanism 7, which improves the stability of the mounting base 4 and the top point 3 and avoids the impact of the up and down movement of the movable platform 22 on them. In this embodiment, the cross slide mechanism 73 includes a first slide rail 71, a first slide block 72, a slide table 73, a second slide rail 74, and a second slide block 75. The first slide rail 71 is vertically mounted on the moving platform 22. The slide table 73 is slidably connected to the first slide rail 71 via the first slide block 72. In this embodiment, there are two first slide rails 71 spaced laterally, and two second slide blocks 75 corresponding one-to-one with the first slide rails 71. The second slide rail 74 is horizontally mounted on the slide table 73, and the second slide block 75 slides in conjunction with the second slide rail 74 and is fixedly connected to the mounting base 4. Furthermore, in this embodiment, the mounting frame 6 is located behind the moving platform 22 and the slide table 73, and the rear side of the slide table 73 is fixedly connected to one side of the mounting frame 6 by bolts. This ensures that when the moving platform 22 moves the cyclone milling head 14 up and down, the mounting base 4 remains stationary, further guaranteeing the stability of the mounting base 4 and the top point 3.

[0026] Furthermore, in this embodiment, the driving component 5 is a hydraulic cylinder, and a back pressure valve is provided in the hydraulic cylinder's oil circuit, enabling the tip 3 to apply a relatively constant pressure to the workpiece. When the slide 21 feeds towards the machine tool spindle 13, the back pressure valve releases pressure from the hydraulic cylinder, stabilizing its pressure and causing the piston rod of the hydraulic cylinder to retract, maintaining stable contact between the tip 3 and the tail of the workpiece. In this embodiment, a pressure reducing valve is also provided in the oil circuit to further ensure the stability of the oil pressure.

[0027] Furthermore, such as Figure 5 As shown, the inner side of the mounting base 4 has a mounting groove 41 and an outwardly protruding mounting protrusion 42. The mounting groove is used to install the second slide 75. The mounting protrusion 42 is provided with a mounting groove 43. The shape of the mounting groove 43 is adapted to the shape of the tail of the tip 3 and is set in the same direction as the mounting groove 41. One side opening of the mounting groove 43 is a narrow slit. After the tip 3 is inserted into the mounting groove 43, the two side walls of the mounting groove 43 are brought together by bolts, so that the two side walls of the mounting groove 43 clamp and fix the tip 3. The rear end of the mounting protrusion 42 has a mounting groove 44. The piston rod of the drive member 5 is connected to the mounting base 4 at the mounting groove 44, so that the tip 3 and the drive member 5 are at the same height, so that the tip 3 is subjected to more balanced force and ensures its stability.

[0028] The working process of this utility model is as follows: After the workpiece is loaded and fixed at one end of the machine tool spindle 13 through the loading mechanism 12, the slide plate 21 drives the cyclone milling head 14 and the self-centering tailstock mechanism to move towards one end of the machine tool spindle 13, so that the workpiece is located in the cyclone milling head 14. Then, the drive member 5 drives the tip 3 to move forward and abut against the rear end of the workpiece, forming support for the workpiece. Then, the drive member 5 is adjusted to the pressure holding state. When the slide plate 21 drives the cyclone milling head 14 to feed and cut the workpiece, the piston rod of the drive member 5 is passively retracted, so that the tip 3 remains stationary relative to the machine tool spindle 13 and ensures stable abutment with the workpiece until the processing is completed.

[0029] Example 2

[0030] This embodiment is basically the same as the technical solution of Embodiment 1. The difference is that in this embodiment, the driving component 5 adopts a motor-driven screw transmission mechanism. When the slide plate 21 drives the cyclone milling head 14 and the driving component 5 to move forward, the motor actively drives the tip 3 to move away from the machine tool spindle 13 relative to the slide plate 21 through the control system. Its moving speed is equivalent to the feed speed of the slide plate 21, so that the tip 3 always maintains a stable fit with the workpiece.

[0031] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0032] Although this document frequently uses terms such as bed 11, loading mechanism 12, machine tool spindle 13, milling head 14, slide 21, moving table 22, center 3, and mounting base 4, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would contradict the spirit of this utility model.

Claims

1. A self-centering tailstock mechanism for a worm gear milling machine, the worm gear milling machine comprising a bed (11), a machine spindle (13), and a worm gear milling head (14), wherein the bed (11) is provided with a slide (21) that can move laterally relative to the machine spindle (13), and the slide (21) is provided with a movable stage (22) that can move up and down relative to the slide (21) and is used to mount the worm gear milling head (14), characterized in that, The self-centering tailstock mechanism comprises a top center (3), a mounting seat (4) and a driving member (5), the top center (3) is mounted on the mounting seat (4), the driving member (5) is arranged on a drag plate (21), and the driving member (5) is connected with the mounting seat (4) and used for driving the mounting seat (4) to move transversely and reciprocally.

2. The self-centering tailstock mechanism for a worm whirlwind milling machine according to claim 1, wherein The driving member (5) is a hydraulic cylinder, and a back pressure valve is arranged on an oil way of the hydraulic cylinder.

3. The self-centering tailstock mechanism for a worm whirlwind milling machine according to claim 1 or 2, characterized in that, The mounting seat (4) is connected with a moving table (22) through a cross slide (73) mechanism (7).

4. The self-centering tailstock mechanism for a worm whirlwind miller as claimed in claim 3, wherein, The cross slide (73) mechanism (7) comprises a first slide rail (71), a first slide base (72), a slide (73), a second slide rail (74) and a second slide base (75), the first slide rail (71) is vertically arranged on the moving table (22), the slide (73) is slidably connected with the first slide rail (71) through the first slide base (72), the second slide rail (74) is transversely arranged on the slide (73), the second slide base (75) is slidably connected with the second slide rail (74) and is fixedly connected with the mounting seat (4).

5. The self-centering tailstock mechanism for a worm whirlwind miller as claimed in claim 4, wherein, A mounting frame (6) is fixedly arranged on the drag plate (21), the driving member (5) is fixedly arranged on the mounting frame (6), and one side of the mounting frame (6) is fixedly connected with the slide (73).

6. The self-centering tailstock mechanism for a worm whirlwind miller as claimed in claim 5, wherein The top center (3) is located at the same height as the driving member (5).

7. The self-centering tailstock mechanism for a worm whirlwind miller as claimed in claim 6, wherein One side of the mounting seat (4) is provided with a mounting groove (41) and an outwardly protruding mounting protrusion (42), the mounting groove (41) is used for mounting the second slide base (75), the mounting protrusion (42) is provided with a mounting groove (43), the mounting groove (43) is used for mounting the top center (3) and is arranged in the same direction as the mounting groove (41).

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