Machine tool feed shaft response lifting device

Abstract

The utility model discloses a machine tool feed shaft response lifting device which comprises a sliding unit which is driven by a feed shaft to slide on a rail, a compensation mechanism which is in contact and rolling fit with a stress surface of the rail is arranged on the sliding unit, and the compensation mechanism can adjust the pressure on the stress surface of the rail. The compensation mechanism comprises a rolling element, a rolling shaft frame, a disc spring, a gland and an adjusting screw rod, the rolling shaft frame and the gland are movably arranged in the sliding unit, the rolling element is installed on the rolling shaft frame and makes contact with the stress face of the track to roll, the disc spring is arranged between the gland and the rolling shaft frame, and the adjusting screw rod is arranged on the adjusting screw rod. And the adjusting screw rod is screwed on the sliding unit and can drive the gland to compress the disc spring. The compensation mechanism is arranged in the sliding unit, unloading is conducted through rolling fit of the compensation mechanism and the rail, and therefore the friction force between the sliding unit and the rail is reduced, and the response speed of the feeding shaft is increased.

Description

Technical Field

[0001] The utility model relates to the field of machine tools, in particular to a device capable of improving the response of a feed shaft driving a sliding unit of a machine tool to move. Background Art

[0002] Machine tools usually use a feed shaft to drive a sliding unit to achieve linear movement on a track to process parts. For example, a motor and a lead screw are used to drive a saddle to slide for part processing. When heavier parts are installed on the saddle for processing, the friction increases, which slows down the response of the feed shaft and increases the load on the motor. In addition, the movement of the saddle increases the heat generated by the track. The existing approach is to reduce the surface roughness of the track, increase lubrication, or use rolling instead of sliding. However, rolling has large runout and is unstable, which is not conducive to precision processing. Utility Model Content

[0003] In order to solve the problem that the sliding unit has a large mass and causes the feed axis to respond slowly during processing, the technical solution adopted by the utility model is:

[0004] A machine tool feed shaft response lifting device comprises a sliding unit driven by the feed shaft to slide on a track, a compensation mechanism contacting and rolling with a force-bearing surface of the track is arranged on the sliding unit, and the compensation mechanism can adjust the pressure with the force-bearing surface of the track;

[0005] The compensation mechanism includes a rolling element, a roller frame, a disc spring, a pressure cover and an adjusting screw. The roller frame and the pressure cover are movably arranged in a sliding unit. The rolling element is installed on the roller frame and contacts the force-bearing surface of the track for rolling. The disc spring is arranged between the pressure cover and the roller frame. The adjusting screw is threaded on the sliding unit and can drive the pressure cover to compress the disc spring.

[0006] Furthermore, a locking nut is provided on the adjusting screw.

[0007] Furthermore, a guide shaft for guiding and limiting the pressure cover is arranged on the roller frame.

[0008] Furthermore, the rolling element is a bearing or a roller.

[0009] A compensation mechanism is provided in the sliding unit, and unloading is performed through rolling cooperation between the compensation mechanism and the track, thereby reducing the friction between the sliding unit and the track and improving the response speed of the feed shaft. The pressure between the rolling element in the compensation mechanism and the force-bearing surface of the track is adjustable, and different unloading forces can be adjusted according to the mass of the parts or the sliding unit itself to meet the response speed of the feed shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1Schematic diagram of the machine tool sliding unit, track and feed axis structure

[0011] Figure 2 for Figure 1 Middle AA section view;

[0012] Figure 3 for Figure 2 Partial cross-sectional view along BB

[0013] Figure 4 This is a schematic diagram of the assembly structure of the rolling unit, roller frame, disc spring and pressure cover in the compensation mechanism. DETAILED DESCRIPTION

[0014] The technical solution of the utility model is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] like Figure 1 The saddle 8 shown is slidably set on the track 9 as a sliding unit. The vertical force-bearing surface 9-1 of the track 9 is subjected to the gravity of the saddle and the gravity of the parts installed on the saddle during processing. The greater the pressure on the force-bearing surface of the track 9, the greater the friction of the saddle. The screw 10 and the motor 11 serving as the feed shaft need to overcome the friction between the saddle and the track when driving the saddle to move on the track. The greater the friction, the slower the response speed of the feed shaft and the greater the load of the motor 11. Increasing the response speed can improve processing efficiency and reduce power consumption.

[0016] like Figure 2 The saddle shown in the figure is equipped with a compensation device for unloading to reduce the friction between the saddle and the rail and improve the response speed of the feed axis. The specific compensation device is as follows Figure 3The figure shows a rolling element 1, a roller frame 2, a disc spring 3, a pressure cover 4 and an adjusting screw 5. A mounting groove 8-1 is provided on the saddle 8 near the guide rail. The roller frame 2 and the pressure cover 4 are both placed in the mounting groove 8-1 and can independently move in the depth direction of the mounting groove 8-1. The rolling element 1 is installed on the roller frame 2 and contacts with the track. When the saddle moves, the rolling element 1 forms a rolling fit with the track. The disc spring 3 is arranged between the roller frame 2 and the pressure cover. The adjusting screw 5 is screwed on the saddle and one end rests on the pressure cover 4. When the adjusting screw 5 is screwed into the mounting groove 8-1, the pressure cover 4 can be driven to move toward the side of the roller frame 2 to compress the disc spring 3, and the elastic force of the disc spring 3 is increased. When the adjusting screw 5 is screwed outward, the pressure cover 4 is affected by the elastic force of the disc spring 3 and moves away from the roller frame 2, and the elastic force of the disc spring 3 is reduced. Therefore, when the mass of the saddle is large, the pressure at the contact part between the rolling element 1 and the track force surface is increased by adjusting the screw 5 to drive the gland to compress the disc spring 3, thereby transferring part of the pressure on the track to the compensation mechanism, and the compensation mechanism and the track are in rolling cooperation to further reduce the friction, thereby improving the response speed of the feed shaft. When adjusting the compression of the disc spring, the spring force can be judged by a torque wrench, or by the load change of the motor 11, and the compression of the disc spring can be adjusted to a reasonable response state for the feed shaft. In addition, the disc spring 3 can also play a buffering role in the mechanism, eliminating the influence of the track's own accuracy, ensuring that the force exerted by the rolling element 1 when rolling on the track is uniform, and avoiding the problem of excessive rigid contact vibration.

[0017] In order to stabilize the position of the adjusting screw 5 after it is adjusted into place, Figure 3 As shown, a locking nut 6 is also provided on the adjusting screw 5. When the adjusting screw 5 is screwed to a predetermined position, the locking nut 6 is tightened to lock the adjusting screw 5 to prevent it from loosening.

[0018] In order to facilitate assembly and ensure the stability and reliability of the moving direction of the gland 4 when compressing the disc spring 3, Figure 4 As shown in the figure, a guide shaft 7 is arranged on the roller frame 2, and the pressure cover 4 is sleeved on the guide shaft 7 and can move axially along the guide shaft 7, and the guide shaft 7 forms a limit for the pressure cover 4 to prevent the pressure cover 4 from being separated from the roller frame 2. Figure 3 The guide shaft 7 is a bolt, and the threaded section of the bolt is screwed onto the roller frame 2. The head of the bolt forms a limit for the gland to prevent the gland from falling off from one end of the bolt head. There is no threaded connection between the gland 4 and the bolt, which allows it to slide along the axial direction of the bolt. The bolt can assemble the roller frame 2, the gland 4 and the disc spring 3 into one, so that they can be installed into the installation groove 8-1 together when equipped. In order to facilitate the tightening of the bolt at any time, the adjusting screw 5 is set to a hollow tube shape. When the bolt needs to be tightened, it can be tightened from the center of the adjusting screw 5, and it does not need to be disassembled for tightening, which is convenient for maintenance.

[0019] Since the adjusting screw 5 rotates relative to the gland 4 when the gland is pushed, the contacting part between the adjusting screw 5 and the gland is kept lubricated and smooth to avoid mutual wear.

[0020] In order to balance the force of the compensation mechanism and provide sufficient unloading capacity, the compensation mechanism can be arranged in a group along the length direction of the track on the sliding unit. And the compensation mechanism is preferably arranged at least on the vertical force surface of the track. Figure 1 and Figure 2 As shown, since the main change of friction force comes from the gravity of parts and sliding units, setting the compensation device on the top of the saddle relative to the vertical force-bearing surface of the track can effectively unload the load. Setting compensation devices on other force-bearing surfaces of the track can also further improve the response of the feed axis.

Claims

1. A machine tool feed shaft response lifting device, comprising a sliding unit driven by the feed shaft to slide on a track, characterized in that: The sliding unit is provided with a compensation mechanism that is in contact and rolling cooperation with the track force-bearing surface, and the compensation mechanism can adjust the pressure on the track force-bearing surface; The compensation mechanism comprises a rolling element (1), a roller frame (2), a disc spring (3), a pressure cover (4) and an adjusting screw (5); the roller frame (2) and the pressure cover (4) are movably arranged in a sliding unit; the rolling element (1) is mounted on the roller frame (2) and contacts the force-bearing surface of the track for rolling; the disc spring (3) is arranged between the pressure cover (4) and the roller frame (2); and the adjusting screw (5) is screwed on the sliding unit and can drive the pressure cover (4) to compress the disc spring (3).

2. The machine tool feed axis response improvement device according to claim 1, characterized in that: A locking nut (6) is arranged on the adjusting screw (5).

3. The machine tool feed axis response improvement device according to claim 1, characterized in that: A guide shaft (7) for guiding and limiting the pressing cover (4) is arranged on the roller frame (2).

4. The machine tool feed axis response improvement device according to claim 1, characterized in that: The rolling element (1) is a bearing or a roller.

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