Auxiliary reinforcing structure of ball screw supporting seat of numerical control machine tool

Abstract

The utility model relates to the technical field of numerical control machine tools, and discloses an auxiliary reinforcing structure of a ball screw supporting seat of a numerical control machine tool, which comprises a machine tool body, a front end supporting boss is arranged on one side of the upper end of the machine tool body, a tail end supporting boss is arranged on the other side of the upper end of the machine tool body, and the upper end of the front end supporting boss is connected with a motor seat through a bolt. A motor is installed at one end of the motor base, the upper end of the tail end supporting boss is connected with a supporting base through a bolt, a ball screw is arranged between the supporting base and the motor base in a rotating mode, one end of the ball screw is connected with the output end of the motor, and the ball screw is sleeved with a transmission nut in a threaded mode. The wedge block is added to assist in reinforcing the supporting seat and the motor seat of the ball screw, and the front end supporting boss and the tail end supporting boss on the lathe bed are obliquely pulled, so that the overall rigidity of the ball screw pair is enhanced, and the precision and the stability of the numerical control machine tool are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of numerical control machine tools, and particularly relates to an auxiliary reinforcement structure for a ball screw support seat of a numerical control machine tool. Background Technique

[0002] Ball screws are widely used in the transmission systems of numerical control machine tools. Compared with the trapezoidal screws used in traditional ordinary machine tools, the transmission friction is changed from sliding friction to rolling friction. In addition to the improvement of friction performance, one of the most important characteristics is the ability to achieve backlash-free transmission.

[0003] The characteristics of a numerical control machine tool are precise control of the movement feed amount, requiring the transmission mechanism to be accurately transmitted. In addition to the manufacturing accuracy of the ball screw itself used for transmission, the installation and support rigidity of the ball screw are also important reasons affecting the transmission accuracy.

[0004] During the process of the ball screw rotating to drive the movement of the numerical control machine tool components, it is subject to the reaction force of the drive. The reaction force causes the stretching or compression deformation of the screw, thereby reducing the transmission accuracy.

[0005] The conventional method is to thicken the diameter of the ball screw and increase the outer shape of the ball screw support seat, etc.

[0006] Such a method has the following disadvantages:

[0007] 1. Thickening the diameter of the ball screw will cause an increase in cost, an increase in the moment of inertia of the screw, and a consumption of motor drive power;

[0008] 2. Increasing the ball screw support seat also causes an increase in cost. Content of the Utility Model

[0009] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides an auxiliary reinforcement structure for a ball screw support seat of a numerical control machine tool, which effectively solves the problems raised in the above background.

[0010] To achieve the above purpose, the utility model provides the following technical solutions: an auxiliary reinforcement structure for a ball screw support seat of a numerical control machine tool, including a bed body. On one side of the upper end of the bed body, there is a front-end support boss, and on the other side of the upper end of the bed body, there is a tail-end support boss. The upper end of the front-end support boss is connected to a motor seat by bolts. One end of the motor seat is equipped with a motor. The upper end of the tail-end support boss is connected to a support seat by bolts. A ball screw is rotatably arranged between the support seat and the motor seat. One end of the ball screw is connected to the output end of the motor, and a transmission nut is threadedly sleeved on the outside of the ball screw;

[0011] Wedge-shaped grooves are provided at the upper ends of the front-end support boss and the tail-end support boss. Wedge blocks are connected in the wedge-shaped grooves by bolts, and the motor seat and the support seat are assisted and fastened to the bed body through the wedge blocks.

[0012] Preferably, the slope of the inclined surface of the wedge block is 30°.

[0013] Preferably, both ends of the ball screw are rotatably connected to the support base and the motor base through bearings.

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

[0015] 1. In the present utility model, by adding wedge blocks to assist in strengthening the support base and the motor base of the ball screw, and the diagonal tension shape of the front-end support boss and the tail-end support boss on the bed body, the overall rigidity of the ball screw pair is enhanced, thereby improving the accuracy and stability of the numerical control machine tool;

[0016] 2. By using the auxiliary fastening of the wedge blocks with this structure, the quality of the numerical control machine tool is improved and its value is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, but do not constitute a limitation to the present utility model.

[0018] In the drawings:

[0019] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0020] Figure 2 is a schematic diagram of the auxiliary fastening of the wedge block of the present utility model;

[0021] Figure 3 is a schematic diagram of the force on the wedge block of the present utility model;

[0022] In the figure: 1. Bed body; 2. Front-end support boss; 3. Tail-end support boss; 4. Motor base; 5. Motor; 6. Support base; 7. Ball screw; 8. Transmission nut; 9. Wedge-shaped groove; 10. Wedge block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the 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 the embodiments; based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0024] Example 1, consists of Figure 1 - Figure 2Given that, the utility model includes a bed body 1. On one side of the upper end of the bed body 1, there is a front support boss 2, and on the other side of the upper end of the bed body 1, there is a tail support boss 3. The upper end of the front support boss 2 is connected with a motor base 4 by bolts. One end of the motor base 4 is equipped with a motor 5. The upper end of the tail support boss 3 is connected with a support base 6 by bolts. A ball screw 7 is rotatably arranged between the support base 6 and the motor base 4. One end of the ball screw 7 is connected with the output end of the motor 5. An external thread of the ball screw 7 is sleeved with a transmission nut 8;

[0025] On the upper ends of both the front support boss 2 and the tail support boss 3, there are wedge-shaped grooves 9. In the wedge-shaped grooves 9, there are wedge blocks 10 connected by bolts. The motor base 4 and the support base 6 are assisted and fastened on the bed body 1 through the wedge blocks 10;

[0026] In this solution, the motor base 4 and the support base 6 on the front support boss 2 and the tail support boss 3 of the bed body 1 both adopt an inclined pull shape. The inclined pull direction is towards the outside of the ball screw pair to offset the direction of the tensile force of the ball screw 7, so that the bed body 1 has stronger support rigidity for the motor base 4 and the support base 6;

[0027] The slope of the inclined surface of the wedge block 10 is 30°;

[0028] Both ends of the ball screw 7 are rotatably connected with the support base 6 and the motor base 4 through bearings.

[0029] Working principle: Explanation of the force deformation of the ball screw transmission pair:

[0030] The ball screw 7 is tightened between the motor base 4 and the support base 6 through a round nut. The tightening force (also known as the pre-tensile force) of the ball screw 7 will cause the motor base 4 and the support base 6 to deform inward;

[0031] When the motor 5 drives the ball screw 7 and then the transmission nut 8 drives the moving parts, the transmission nut 8 exerts a reaction force on the ball screw 7. The reaction force causes the ball screw 7 to be stretched or compressed and deformed. At the same time, the reaction force is transmitted to the motor base 4 and the support base 6 through the ball screw 7, causing the motor base 4 and the support base 6 to deform inward (when stretched) or outward (when compressed). These deformations will all affect the transmission accuracy of the ball screw transmission pair;

[0032] This new type installs the ball screw transmission pair on the bed body 1 by first fastening the motor base 4 and the support base 6 on the front support boss 2 and the tail support boss 3 with bolts, and then using the wedge blocks 10 to assist in fastening the motor base 4 and the support base 6 in the wedge-shaped grooves 9 at the corresponding installation positions;

[0033] Such as Figure 3The wedge block 10 has an inclination of 30° and is fastened in the wedge-shaped groove 9 with bolts. The bolts exert a downward tightening force N, and the inclined surface generates a reaction force F. The reaction force F is decomposed into a component force f1 in the vertical direction and a component force f2 in the horizontal direction. The component force f1 is equal to the tightening force N in magnitude and opposite in direction, forming a vertical force balance. The component force f2 in the horizontal direction tightens the motor seat 4 and the support seat 6.

[0034] By adding a wedge block 10 to assist in reinforcing the support seat 6 and the motor seat 4 of the ball screw 7, as well as the inclined-stayed shape of the front end support boss 2 and the rear end support boss 3 on the bed 1, the overall rigidity of the ball screw pair is enhanced, thereby improving the accuracy and stability of the CNC machine tool.

Claims

1. An auxiliary reinforcement structure for a ball screw support seat of a CNC machine tool, comprising a bed (1), characterized in that: A front end support boss (2) is provided on one side of the upper end of the bed (1), and a rear end support boss (3) is provided on the other side of the upper end of the bed (1); the upper end of the front end support boss (2) is connected to a motor seat (4) by bolts, a motor (5) is installed at one end of the motor seat (4), and the upper end of the rear end support boss (3) is connected to a support seat (6) by bolts, a ball screw (7) is rotatably provided between the support seat (6) and the motor seat (4), one end of the ball screw (7) is connected to the output end of the motor (5), and a transmission nut (8) is sleeved on the outer thread of the ball screw (7); The upper ends of the front end support boss (2) and the rear end support boss (3) are both provided with a wedge-shaped groove (9), and a wedge block (10) is connected in the wedge-shaped groove (9) by means of bolts, and the motor seat (4) and the support seat (6) are auxiliaryly fastened to the bed (1) by means of the wedge block (10).

2. The auxiliary reinforcement structure of the ball screw support seat of a CNC machine tool according to claim 1, characterized in that: The slope of the inclined surface of the wedge block (10) is 30°.

3. The auxiliary reinforcement structure of the ball screw support seat of a CNC machine tool according to claim 1, characterized in that: The two ends of the ball screw (7) are rotatably connected to the support seat (6) and the motor seat (4) via bearings.

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