A thermal expansion compensation device for the lead screw of a five-axis machining center

Abstract

This utility model relates to the field of lead screw installation, and more particularly to a thermal expansion compensation device for a lead screw in a five-axis machining center. It includes a lead screw threadedly connected to a nut; a first fixed seat, one end of the lead screw rotatably connected to the first fixed seat; a second fixed seat, the other end of the lead screw being floatingly connected to the second fixed seat; and a floating assembly mounted on the second fixed seat, allowing the end of the lead screw to float axially and be connected to the second fixed seat. By setting the floating assembly, the working accuracy of the lead screw is improved, and its service life is extended.

Description

Technical Field

[0001] This utility model relates to the field of lead screw installation, and in particular to a thermal extension compensation device for a five-axis machining center transmission lead screw. Background Technology

[0002] Lead screws, a common mechanical device on CNC machine tools, primarily function to drive guide rails to slide on the lathe. A typical lead screw structure consists of a lead screw, a nut, and a fixed base. The lead screw rotates via the driving force of an external drive component (such as a motor). Lead screws are generally made of metal; after prolonged use, the metal material can experience thermal deformation, affecting the transmission accuracy of the lead screw and guide rails, and consequently, the machining accuracy of the lathe.

[0003] Chinese patent CN114060488A discloses a lead screw mounting structure that can adapt to the thermal deformation of the lead screw, belonging to the field of lead screw installation. It includes a lead screw made of steel and a lead screw fixing frame. The lead screw fixing frame includes a central frame and two mounting seats, which are fixed at both ends of the central frame. The lead screw is located between the two mounting seats, and both ends of the lead screw are rotatably mounted on the mounting seats on both sides. The lead screw and the lead screw fixing frame expand or contract simultaneously due to heat or cooling. A rigid connector is provided between the lead screw fixing frame and the bed to fix the lead screw fixing frame to the bed. One or both sides of the lead screw fixing frame can expand or contract along the length direction of the lead screw. The bed of this invention does not restrict the expansion or contraction of the lead screw fixing frame along the length direction of the lead screw, allowing the lead screw fixing frame to adapt to the thermal deformation of the lead screw, avoiding affecting the normal use of the lead screw. Furthermore, the lead screw fixing frame can provide rigid support for both ends of the lead screw, preventing the lead screw from bending due to thermal deformation.

[0004] However, this technical solution uses a sliding groove as the component for the expansion and contraction of the lead screw, which usually leaves a certain gap. The existence of the gap may cause the lead screw to wobble in the radial or axial direction; after long-term use, there will be some wear, reducing the service life of the component, etc. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a thermal extension compensation device for the lead screw of a five-axis machining center. Through a floating component structure, this device solves the problem of thermal deformation of the lead screw, improves the accuracy of the lead screw's operation, and extends its service life.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A thermal expansion compensation device for a lead screw in a five-axis machining center includes: A lead screw, which is threadedly connected to a nut; The first fixed seat, one end of the lead screw is rotatably connected to the first fixed seat through a first bearing; The second fixed seat is floatingly connected to the other end of the lead screw; The feature is that it further includes a floating component, which is installed on the second fixed base, so that the end of the lead screw is floatingly connected to the second fixed base along its axial direction.

[0007] Preferably, the floating component includes: The second bearing is axially slidably mounted in the second fixed seat, and the other end of the lead screw is fixedly connected to the inner ring of the second bearing; Fasteners, a plurality of said fasteners connecting the second bearing and the second fixed seat; And an elastic element, which is sleeved on the fastener, with its other end abutting against the end face of the second bearing, so that the second bearing has floating space along its axial direction. Preferably, the first bearing and the second bearing are bearings with bearing housings.

[0008] Preferably, it also includes a drive assembly for driving the lead screw to rotate; The driving component includes: Electric motor; A synchronous belt assembly, one end of which is connected to the output end of the motor, and the other end of which is connected to the floating end of the lead screw; the motor drives the lead screw to rotate through the synchronous belt assembly.

[0009] Preferably, the floating end of the lead screw is further provided with a support bearing for supporting the head of the lead screw, the support bearing is installed on the second fixed seat, and the head of the lead screw is connected to the support bearing.

[0010] Preferably, the portion of the synchronous belt assembly that connects to the lead screw is located between the support bearing and the second bearing.

[0011] The beneficial effects of this utility model are as follows: (1) By setting a floating component, the floating component is installed on the second fixed seat, so that the end of the screw floats and is connected to the second fixed seat along its axial direction. As the screw works for a long time, the screw will deform to a certain extent. The floating component provides the deformation space after thermal expansion, ensuring the stable operation of the screw and nut and extending the working life of the screw shaft.

[0012] (2) By setting a support bearing, which is set at the floating end of the lead screw, this utility model avoids the cantilever structure at the end of the lead screw from affecting the transmission accuracy of the lead screw during the transmission process of the drive assembly driving the lead screw.

[0013] In summary, this utility model has the advantages of improving the working accuracy of the lead screw and extending its service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a diagram showing the internal structure of the second fixing base of this utility model; Figure 3 This is a cross-sectional view of the second fixing seat of this utility model; Figure label: 1. Lead screw; 2. Nut; 3. First fixed seat; 31. First bearing; 4. Second fixed seat; 5. Floating assembly; 51. Second bearing; 52. Fastener; 53. Elastic element; 6. Drive assembly; 61. Motor; 62. Synchronous belt assembly; 621. First pulley; 622. Synchronous belt; 623. Second pulley; 7. Support bearing. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0017] Example 1 like Figures 1-3 As shown, this embodiment provides a thermal expansion compensation device for the lead screw of a five-axis machining center, comprising: Lead screw 1, wherein the lead screw 1 is threadedly connected to nut 2; The first fixed seat 3, one end of the lead screw 1 is rotatably connected to the first fixed seat 3 through the first bearing 31; specifically, the lead screw 1 is rotatably connected to the first fixed seat 3 through the first bearing 31, and the first bearing 31 is used to limit the lead screw axially.

[0018] The second fixed seat 4 is floatingly connected to the other end of the lead screw 1; The floating component 5 is installed on the second fixed base 4, so that the end of the lead screw 1 is floatingly connected to the second fixed base 4 along its axial direction.

[0019] The floating component 5 includes: The second bearing 51 is axially slidably installed in the second fixed seat 4, and the other end of the lead screw 1 is fixedly connected to the inner ring of the second bearing 51. Fastener 52, a plurality of said fasteners 52 connect the second bearing 51 and the second fixed seat 4; And an elastic element 53, which is sleeved on the fastener 52, with its other end abutting against the end face of the second bearing 51, so that the second bearing 51 has floating space along its axial direction; the elastic element 53 is preferably a disc spring.

[0020] The first bearing 31 and the second bearing 51 are bearings with bearing housings.

[0021] It also includes a drive assembly 6 for driving the lead screw 1 to rotate; The driving component 6 includes: Motor 61; A synchronous belt assembly 62 is provided, one end of which is connected to the output end of a motor 61, and the other end is connected to the floating end of a lead screw 1. The motor 61 drives the lead screw 1 to rotate through the synchronous belt assembly 62. The synchronous belt assembly 62 includes a first pulley 621, a synchronous belt 622, and a second pulley 623. The diameter of the first pulley 621 is smaller than that of the second pulley 623.

[0022] The floating end of the lead screw is also provided with a support bearing 7 for supporting the head of the lead screw 1. The support bearing 7 is installed on the second fixed seat 4, and the head of the lead screw 1 is connected to the support bearing 7.

[0023] The portion of the synchronous belt assembly 62 that connects to the lead screw 1 is located between the support bearing 7 and the second bearing 51. The support bearing 7 is provided to prevent a cantilever structure from appearing at the end of the lead screw 1 during the transmission process of the drive assembly 5 driving the lead screw 1, which would affect the transmission accuracy of the lead screw 1.

[0024] When the motor 61 starts, the synchronous belt assembly 62 begins to operate, and the lead screw 1 connected to the synchronous belt assembly 62 begins to work. The first fixed seat 3 fixes the lead screw 1 to ensure that its axial position does not move. As the lead screw 1 works for a long time, it will deform to a certain extent. The floating assembly 6 provides space for its deformation after thermal expansion, ensuring the stable operation of the lead screw 1 and the nut 2.

[0025] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A thermal expansion compensation device for a lead screw in a five-axis machining center, comprising: A lead screw, which is threadedly connected to a nut; The first fixed seat, one end of the lead screw is rotatably connected to the first fixed seat through a first bearing; The second fixed seat is floatingly connected to the other end of the lead screw; The feature is that it further includes a floating component, which is installed on the second fixed base, so that the end of the lead screw is floatingly connected to the second fixed base along its axial direction.

2. The thermal extension compensation device for the lead screw of a five-axis machining center according to claim 1, characterized in that, The floating component includes: The second bearing is axially slidably mounted in the second fixed seat, and the other end of the lead screw is fixedly connected to the inner ring of the second bearing; Fasteners, a plurality of said fasteners connecting the second bearing and the second fixed seat; And an elastic element, which is sleeved on the fastener, with its other end abutting against the end face of the second bearing, so that the second bearing has floating space along its axial direction.

3. The thermal extension compensation device for the lead screw of a five-axis machining center according to claim 2, characterized in that, The first and second bearings are bearings with bearing housings.

4. The thermal extension compensation device for the lead screw of a five-axis machining center according to claim 1, characterized in that, It also includes a drive assembly for driving the lead screw to rotate; The driving component includes: Electric motor; A synchronous belt assembly, one end of which is connected to the output end of the motor, and the other end of which is connected to the floating end of the lead screw; the motor drives the lead screw to rotate through the synchronous belt assembly.

5. The thermal extension compensation device for the lead screw of a five-axis machining center according to claim 1, characterized in that, The floating end of the lead screw is also provided with a support bearing for supporting the head of the lead screw. The support bearing is installed on the second fixed seat, and the head of the lead screw is connected to the support bearing.

6. A thermal expansion compensation device for a five-axis machining center transmission lead screw according to claim 4, characterized in that, The portion of the synchronous belt assembly that connects to the lead screw is located between the support bearing and the second bearing.

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