CN112518397A - Main transmission system of numerical control boring machine - Google Patents

Abstract

The invention provides a main transmission system of a numerical control boring machine, which comprises a main shaft box, a main shaft unit, a precision speed reducer, a coupler and a main shaft motor. The main transmission system of the numerical control boring machine has the advantages of short transmission chain, compact structure, good rigidity, economy and applicability; the torque is increased through the speed regulation of the spindle motor and the speed reducer, so that the output rotating speed range and the torque meet the technological requirements, and the machine tool is suitable for low-speed and high-torque cutting processing of a special machine tool; the front end of the main spindle box adopts a cantilever structure design, so that the deep part of the vehicle body can be machined.

Description

A main drive system of a CNC boring machine

technical field

The invention belongs to the technical field of metal cutting machine tools, in particular to a main drive system of a numerically controlled boring machine.

Background technique

Special car body front axle processing is a key process in car body manufacturing. The processing process includes boring, end face milling, drilling and tapping and other processes. It is characterized by concentrated processes, complex processes and large cutting volumes.

Over the years, the processing equipment for the front axle of the car body has been backward in technology, and there are problems such as poor processing quality, low efficiency, and inability to use different models. For this reason, considering the structural characteristics of the front axle of the car body, the accuracy requirements, the diversity of models and other factors, it is necessary to develop and design a special CNC boring machine. The main transmission system of the machine tool is one of the key parts that determines the performance of the machine tool. It directly determines the processing capacity, processing efficiency and processing accuracy of the machine tool. In order to meet the performance and processing requirements of the special CNC boring machine, it is necessary to develop and design a CNC boring machine main transmission system. .

SUMMARY OF THE INVENTION

(1) Technical problems to be solved

The invention proposes a main drive system of a numerically controlled boring machine. Through specific transmission form and structural design, the machine tool spindle has high precision, high rigidity and high torque cutting ability; , the technical problem of local interference of the car body during processing.

(2) Technical solutions

The present invention provides a main drive system of a numerically controlled boring machine. The main drive system of the numerically controlled boring machine includes a spindle box, a spindle unit, a precision reducer, a coupling and a spindle motor; wherein,

The two wings of the spindle box are installed on the machine tool column through rolling guides. The front end of the spindle box adopts an overhang structure design. The spindle unit is installed in the overhanging bushing hole at the front end of the spindle box; The precision reducer is installed on the rear end face of the spindle box through the flange and is positioned through the spigot; the spindle motor is installed on the rear flange of the precision reducer; the output end of the spindle motor is connected to the precision reducer. The input end connecting sleeve is matched and fixed.

Further, the power transmission of the coupling adopts frictional engagement.

Further, the precision reducer adopts a precision planetary reducer.

(3) Beneficial effects

The invention provides a main drive system of a numerically controlled boring machine, which includes a spindle box, a spindle unit, a precision reducer, a coupling and a spindle motor. The main transmission system of the numerical control boring machine of the invention has the advantages of short transmission chain, compact structure, good rigidity and economical application; the speed regulation of the spindle motor and the increase of the torque through the reducer make the output speed range and torque meet the technological requirements, and are suitable for the special machine tool with medium and low speed and large speed. Torque machining; the front end of the headstock adopts an overhang structure design, which can be used for machining deep parts of the car body.

The technical effects of the present invention specifically include:

(1) The spindle motor transmits the main shaft through the precision planetary reducer to realize constant ratio transmission. Compared with the use of belt drive, it has higher bearing capacity and reliability, and has a wider range of transmission ratio options; compared with ordinary gear drive, it has the characteristics of low backlash, low noise, stable transmission and compact structure.

(2) The front end of the spindle box adopts an overhanging structure design, the spindle unit is installed in the overhanging bushing, and the spindle can penetrate deep into the workpiece for processing during operation.

(3) The main shaft unit, coupling and precision reducer are all professionally produced standard components, with mature and reliable technology, economical and applicable.

Description of drawings

1 is a front cross-sectional view of a main drive system of a CNC boring machine according to an embodiment of the present invention;

Fig. 2 is the top view of the main transmission system of the numerical control boring machine of the embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a spindle box in an embodiment of the present invention.

Detailed ways

In order to make the purpose, content and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

This embodiment proposes a main drive system of a CNC boring machine, the structure of which is shown in FIGS.

The main shaft box 1 is the installation base of each transmission component in the main transmission system, which ensures the overall rigidity and transmission accuracy of the transmission system. As shown in Figure 3, the two wings of the spindle box 1 are installed on the machine tool column through rolling guide rails. The front end of the spindle box 1 is designed with an overhang structure. When working, the spindle unit 2 can probe into the depth of the workpiece for processing, so as to solve the problem of local interference of the car body. The input end of the spindle unit 2 is connected with the output end of the precision reducer 4 through the coupling 3 . The precision reducer 4 is installed on the rear end face of the main shaft box 1 through a flange and is positioned through a spigot to ensure that it is coaxial with the main shaft unit 2 after installation. The spindle motor 5 is installed on the rear end flange of the precision reducer 4 , and the output end of the spindle motor 5 is matched and fixed with the connection sleeve of the input end of the precision reducer 4 .

In the present invention, the main shaft unit 2, the coupling 3, and the precision reducer 4 are all standard components produced by specialization. The spindle unit 2 has high precision and high speed performance, and integrates a tool clamping mechanism and a cutting oil cylinder. The torsional rigidity of the coupling 3 is high, and the power transmission adopts frictional engagement without backlash, and compensates for the coaxiality error between the main shaft unit 2 and the precision reducer 4 to ensure the smooth transmission and avoid shock and vibration. Precision reducer 4 adopts precision planetary reducer, which has the characteristics of low noise, low backlash, high torque and high stability.

The working principle of the main drive system of the numerical control boring machine of the present invention is:

The two wings of the spindle box 1 are installed on the machine tool column through rolling guide rails, and the movement of the column and the spindle box 1 is driven by the feed system to realize the three-coordinate feed movement of the spindle.

The spindle motor 5 realizes the fixed ratio transmission of the transmission system through the precision reducer 4, the coupling 3 and the spindle unit 2, and increases the output torque of the spindle. The spindle speed is controlled by the control system to adjust and control the spindle motor 5 to realize stepless speed change and meet different speed requirements such as boring, end face milling, drilling and tapping.

In the spindle drive chain, the connection between the input and output shafts of the spindle motor 5, the precision reducer 4, the coupling 3, and the precision reducer 4 adopts frictional engagement and no gap transmission, and the precision reducer 4 is a low backlash precision Planetary reducer, the spindle motor 5 has a built-in rotary encoder, and the Z-direction feed of the spindle is synchronized with the rotational motion through the control system, thereby realizing the rigid tapping function.

The main transmission system of the numerical control boring machine of the invention has the advantages of short transmission chain, compact structure, good rigidity and economical application; the speed regulation of the spindle motor and the increase of the torque through the reducer make the output speed range and torque meet the technological requirements, and are suitable for the special machine tool with medium and low speed and large speed. Torque machining; the front end of the headstock adopts an overhang structure design, which can be used for machining deep parts of the car body.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present invention, several improvements and modifications can be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (3)

1. A main transmission system of a numerical control boring machine is characterized by comprising a main shaft box, a main shaft unit, a precision speed reducer, a coupler and a main shaft motor; wherein,

two wings of the spindle box are arranged on a machine tool upright post through rolling guide rails, the front end of the spindle box adopts an overhanging structure design, and a spindle unit is arranged in an overhanging shaft sleeve hole at the front end of the spindle box; the input end of the main shaft unit is connected with the output end of the precision speed reducer through a coupler; the precision speed reducer is arranged on the end surface of the rear part of the main shaft box through a flange and is positioned through a spigot; the spindle motor is arranged on a rear end flange of the precision speed reducer; and the output end of the spindle motor is matched and fixed with the input end of the precision speed reducer in a connecting sleeve manner.

2. The main transmission system of the numerical control boring machine as claimed in claim 1, wherein the power transmission of the coupling is in a friction engagement manner.

3. The main transmission system of the numerical control boring machine as claimed in claim 1, wherein the precision speed reducer is a precision planetary speed reducer.

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