A double-end gear milling gearbox main shaft heat extension compensation system

Abstract

The utility model discloses a thermal elongation compensation system for the main shaft of a double-headed milling gearbox, specifically relating to the technical field of double-headed milling. It includes a control module. The input end of the control module is connected with a temperature acquisition module, and the output end of the control module is connected with two servo motors. A precision ball screw is arranged at the end of the output shaft of the servo motor, and a coupling is fixedly installed between the precision ball screw and the end of the output shaft of the corresponding servo motor. By providing structures such as a platinum thermal resistance and a control module, the utility model solves the problem that the mutual movement between gears generates heat, causing the overall temperature of the main shaft housing to rise, which is finally reflected on the output shaft. As the temperature increases, the output shaft extends, resulting in a change in the absolute position of the tool tip, making the dimensions (length and width) of the machined workpiece unstable. It can meet the processing requirements and ensure the dimensional stability of the machined workpiece.

Description

Technical Field

[0001] This utility model relates to the field of dual-head milling technology, and more specifically, to a dual-head milling gearbox spindle thermal extension compensation system. Background Technology

[0002] Double-head face milling CNC machine tools are specialized machine tools designed for the mold and profile industries to process regular shapes such as cuboids and cubes. This machine tool is used to process the four sides of a workpiece and the chamfering of those sides. It can simultaneously process any two opposite sides. With components such as a backing plate for positioning, hydraulic workpiece clamping, online workpiece measurement, automatic workpiece rotation, and a high-efficiency CNC system, it can process the four sides of a regular six-sided workpiece. The process involves: automatic datum location → hydraulic quick clamping → online measurement of blank dimensions → automatic tool separation → workpiece rotation → automatic tool separation → chamfering → machining completion → return to machine origin. Currently, most double-head face milling machines use gearboxes, which have the advantage of being able to withstand greater chip force compared to belt drives. Through 2-3 stages of gear transmission, a larger gear ratio transmission is achieved; generally, 2 stages are used. A reduction ratio of 6-9 is achieved to obtain greater cutting force. Currently, not all materials in the die-cutting factory are cut by sawing machines; a significant amount is from fire-cut materials with irregular cuts and high hardness. In this case, choosing a gearbox housing paired with a roughing cutter and large inserts for machining the four sides is a reasonable choice. While the gear head performs well in heavy cutting forces, it also exhibits significant disadvantages elsewhere. This is due to the thermal elongation of the output shaft. The gear head uses special gear oil for lubrication during use, and the housing stores a certain amount of lubricating oil. The interaction between gears generates heat, causing the overall temperature of the spindle housing to rise. This heat is ultimately reflected in the output shaft. As the temperature increases, the output shaft elongates, resulting in a change in the absolute position of the cutting tip. This leads to instability in the dimensions (length and width) of the machined workpiece, failing to meet customer requirements.

[0003] Therefore, there is an urgent need for a dual-head milling gearbox spindle thermal extension compensation system to solve the above problems. Utility Model Content

[0004] To overcome the aforementioned deficiencies of the prior art, embodiments of this utility model provide a thermal extension compensation system for a double-head milling gearbox spindle. By incorporating a platinum resistance thermometer, a control module, and other structures, this utility model solves the problem of heat generated by the mutual movement between gears, causing the overall temperature of the spindle housing to rise. This heat is ultimately reflected on the output shaft, which, as the temperature rises, elongates, leading to a change in the absolute position of the cutting tool tip and resulting in instability in the dimensions (length and width) of the machined workpiece. This system can meet the machining requirements and ensure the dimensional stability of the machined workpiece, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dual-head milling gearbox spindle thermal extension compensation system, comprising a control module, an input end of which is connected to a temperature acquisition module, and an output end of which is connected to two servo motors. A precision ball screw is provided at the end of the output shaft of each servo motor, and a coupling is fixedly installed between the precision ball screw and the corresponding end of the servo motor output shaft. A bearing is fixedly installed at the end of the precision ball screw near the coupling, and a transmission nut is provided on the outer side of the precision ball screw. A platinum resistance thermometer is fixedly installed on the top of the transmission nut.

[0006] The temperature acquisition module is used to acquire the resistance change of the platinum resistance thermometer and convert the value into the temperature of the actuator.

[0007] In a preferred embodiment, the transmission nut is threadedly connected to a precision ball screw.

[0008] In a preferred embodiment, the temperature acquisition module is fixedly mounted on a platinum resistance thermometer.

[0009] The technical effects and advantages of this utility model are as follows:

[0010] This invention, by incorporating a platinum resistance thermometer and a control module, solves the problem of heat generated by the interaction of gears, which causes the overall temperature of the spindle housing to rise and ultimately affect the output shaft. As the temperature increases, the output shaft lengthens, leading to a change in the absolute position of the tool tip and resulting in instability in the dimensions (length and width) of the machined workpiece. This invention achieves the required machining performance and ensures the dimensional stability of the machined workpiece. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0012] Figure 2 This is the wiring diagram for the temperature acquisition module of this utility model.

[0013] Figure 3 This is the system wiring diagram of this utility model.

[0014] Figure 4 This is the wiring diagram of the axial servo motor of this utility model.

[0015] The attached diagram is labeled as follows: 1. Control module; 2. Temperature acquisition module; 3. Servo motor; 4. Coupling; 5. Bearing; 6. Transmission nut; 7. Precision ball screw; 8. Platinum resistance thermometer. Detailed Implementation

[0016] 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.

[0017] As attached Figure 1-4 As shown, this utility model provides a thermal extension compensation system for a dual-head milling gearbox spindle, including a control module 1. The input end of the control module 1 is connected to a temperature acquisition module 2, and the output end of the control module 1 is connected to two servo motors 3. A precision ball screw 7 is provided at the end of the output shaft of the servo motor 3. A coupling 4 is fixedly installed between the precision ball screw 7 and the corresponding end of the output shaft of the servo motor 3. A bearing 5 is fixedly installed at the end of the precision ball screw 7 near the coupling 5. A transmission nut 6 is provided on the outside of the precision ball screw 7, and a platinum resistance thermometer 8 is fixedly installed on the top of the transmission nut 6.

[0018] The temperature acquisition module 2 is used to acquire the resistance value change of the platinum resistance thermometer and convert the value into the temperature of the actuator.

[0019] The transmission nut 6 is threadedly connected to the precision ball screw 7.

[0020] The temperature acquisition module 2 is fixedly installed on the platinum resistance thermometer 8;

[0021] The platinum resistance thermometer is model 8 and is set to PT100.

[0022] The specific implementation method is as follows: When using this utility model, the real-time temperature of the mechanical actuator is transmitted to the control module 1 through the temperature acquisition module 2 by the change in the resistance value of the platinum resistance thermometer 8. According to the settings, the system controls the servo motor 3 to compensate for the thermal expansion ▲ε of the gear head output shaft. The PT100 platinum resistance thermometer reflects the temperature change by measuring the change in its resistance value. Its minimum temperature measurement scale is 0.1 degrees Celsius. When the temperature rises, the resistance value of the PT100 increases accordingly, with a change rate of 0.385Ω / ℃. At 0 degrees Celsius, the resistance value is 100Ω, exhibiting a good linear relationship. After the platinum resistance thermometer 8 is connected, the temperature control compensation switch 0 is turned off. Trial processing is performed, and the temperature change, the change in workpiece dimensions after processing, and the system coordinate values ​​are collected and recorded. The measuring tool used is an outside micrometer. The temperature of the gearbox increases with the increase of operating time, and the thermal expansion ▲ε of the spindle is recorded. As the temperature increases, the temperature rise and thermal expansion data of the gearbox are input into the system. The temperature rise and thermal expansion data of the gearbox are input into the system, and the compensation switch is turned on. At this point, the temperature compensation is completed. The system is set to perform a rough milling cut before the finish milling, and the temperature control parameters are instantly added to change the movement coordinates of the left and right gearboxes, compensating for the error caused by the thermal expansion of the spindle. This invention solves the problem that the mutual movement between gears generates heat, causing the overall temperature of the spindle housing to rise, which is ultimately reflected on the output shaft. As the temperature rises, the output shaft will lengthen, resulting in a change in the absolute position of the tool tip, which leads to instability in the dimensions (length and width) of the machined workpiece, thus meeting the machining requirements.

[0023] Working principle of this utility model:

[0024] Refer to the instruction manual appendix Figure 1-4 When using this utility model, by incorporating structures such as a platinum resistance thermometer 8 and a control module 1, this utility model solves the problem of heat generated by the mutual movement between gears, which causes the overall temperature of the spindle housing to rise and ultimately affect the output shaft. As the temperature rises, the output shaft will lengthen, resulting in a change in the absolute position of the tool tip and causing instability in the dimensions (length and width) of the workpiece. This solves the problem of achieving the required processing size and ensuring the dimensional stability of the workpiece.

[0025] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0026] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0027] Finally: 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, improvements, etc., 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 double-head gear milling gearbox main spindle thermal elongation compensation system comprising a control module (1), characterized in that: The input end of the control module (1) is connected to a temperature acquisition module (2), and the output end of the control module (1) is connected to two servo motors (3). A precision ball screw (7) is provided at the end of the output shaft of the servo motor (3). A coupling (4) is fixedly installed between the precision ball screw (7) and the end of the output shaft of the corresponding servo motor (3). A bearing (5) is fixedly installed at the end of the precision ball screw (7) near the coupling (4). A transmission nut (6) is provided on the outside of the precision ball screw (7). A platinum resistance thermometer (8) is fixedly installed on the top of the transmission nut (6). The temperature acquisition module (2) is used to acquire the resistance value change of the platinum resistance thermometer and convert the value into the temperature of the actuator.

2. The thermal expansion compensation system for a double-start milling gearbox spindle according to claim 1, characterized in that: The transmission nut (6) is threadedly connected to the precision ball screw (7).

3. The thermal expansion compensation system for a double-start milling gearbox spindle according to claim 1, characterized in that: The temperature acquisition module (2) is fixedly installed on the platinum resistance thermometer (8).

Images