CN106312564A - Turning, milling and drilling integrated machining equipment and turning, milling and drilling integrated machining method - Google Patents

Abstract

The present invention provides a turning-milling-drilling combination processing equipment and a turning-milling-drilling combination processing method. The equipment includes: a base, a turning processing unit, a drilling processing unit, a milling processing unit, and a numerical control direct drive turntable unit; a turning processing unit, a drilling processing unit The unit and the milling unit are installed on the base in the shape of a "pin"; the CNC direct drive turntable unit is located at the center of the turning unit, the drilling unit and the milling unit. The advantages are: the three processing units of turning, milling and drilling can realize the movement in the height direction and the radial direction of the CNC direct drive turntable. The CNC direct-drive turntable can not only realize high-speed rotation, but also realize index rotation. The high-speed rotation can be set arbitrarily within the range lower than the maximum speed, and the index rotation can realize the rotation at any set angle. The invention is mainly used for the processing of large disc parts, and the turning, milling and drilling processes can be carried out at the same time without tool change, and the processing efficiency of the parts can be effectively improved.

Description

Turning milling drilling combination processing equipment and turning milling drilling combination processing method

technical field

The invention belongs to the technical field of processing large-scale disc-type mechanical parts, and in particular relates to a combined turning-milling-drilling processing equipment and a combined turning-milling-drilling processing method.

Background technique

Large disc parts, such as connecting skirts of solid rocket motors, require not only cylindrical surface and face turning, but also milling of grooving and drilling on cylindrical surfaces. Often, these machining methods cannot be realized on conventional mill-turn machines due to their large size. The usual practice is: first turn the cylindrical surface and the end surface on the vertical lathe, and then transfer to the gantry milling machine for milling and drilling. If it is necessary to perform milling of long slot holes evenly distributed on the entire circumference of the cylindrical surface, an indexing plate is usually added to the gantry milling machine for index milling.

In recent years, large-scale disc parts made of composite materials have also been used more and more. When the above-mentioned processing method is used, the processing efficiency is low due to the complicated process flow. Therefore, there is an urgent need for a turning-milling-drilling combination processing equipment suitable for large disc parts to improve processing efficiency.

Contents of the invention

Aiming at the defects existing in the prior art, the present invention provides a turning-milling-drilling combination processing equipment and a turning-milling-drilling combination processing method, which can effectively solve the above problems.

The technical scheme that the present invention adopts is as follows:

The present invention provides a turning-milling-drilling combined processing equipment, comprising: a base (1), a turning processing unit (2), a drilling processing unit (3), a milling processing unit (4) and a numerically controlled direct drive turntable unit (5); Wherein, the turning processing unit (2), the drilling processing unit (3) and the milling processing unit (4) are installed on the base (1) in the shape of "product"; The turntable unit (5) is installed on the base (1) and is located at the center of the turning unit (2), the drilling unit (3) and the milling unit (4).

Preferably, the turning unit (2) includes a turning basic structure, a turning tool (13) and a tool holder (14);

The drilling unit (3) includes a basic structure for drilling, a high-speed electric spindle for drilling (18) and a drill bit (19);

The milling processing unit (4) includes a milling processing basic structure, a milling high-speed electric spindle and a milling cutter (20);

Wherein, the basic structure of the turning process, the basic structure of the drilling process and the basic structure of the milling process are the same, and all include: a column (6), a Z-direction motion drive unit and a radial motion drive unit; the Z-direction motion Both the driving unit and the radial movement driving unit are assembled on the column (6) for respectively driving the turning tool (13), the drill bit (19) or the milling cutter (20) to perform Z-direction movement or radial movement.

Preferably, the Z-direction motion drive unit includes: Z-direction feed rail pair (7), Z-direction moving plate (8), Z-direction feed servo motor (15), toothed belt (16) and Z-direction feed Give the lead screw pair (17);

The radial motion drive unit includes: a radial feed box (9), a radial feed screw pair (10), a radial feed guide rail pair (11) and a radial feed servo motor (12);

Wherein: there are 4 Z-direction feed rail pairs (7), including: left front Z-direction feed rail pair, right front Z-direction feed rail pair, left rear Z-direction feed rail pair and right rear Z-direction feed rail pair The guide rail pairs are respectively distributed on the left and right sides in front of the column (6) and on the left and right sides behind the column (6); each of the Z-direction feed guide rail pairs (7) includes a Z-direction guide rail, a second 1Z slider and 2Z slider;

There are two Z-direction moving plates (8), including: a front Z-direction moving plate and a rear Z-direction moving plate; the front Z-direction moving plate is located in front of the column (6), and the front Z-direction moving plate is The upper and lower ends on the left side of the moving plate are respectively fixed with the first Z slide block of the left front Z feed guide rail pair and the second Z slide block of the left front Z feed guide rail pair; The upper and lower ends of the right side of the plate are respectively fixed with the first Z-direction slider of the right front Z-direction feed guide pair and the second Z-direction slider of the right front Z-direction feed guide pair; therefore, the front Z-direction movement The left and right sides of the board can slide in the Z direction along the left front Z-direction feed guide pair and the right front Z-direction feed guide pair;

The rear Z-direction moving plate is located behind the column (6), and the upper and lower ends of the left side of the rear Z-direction moving plate are respectively connected to the first Z-direction slider of the left rear Z-direction feed rail pair It is fixed with the 2nd Z-direction slider of the left rear Z-direction feed rail pair; It is fixed with the 2nd Z slider of the right rear Z-direction feed rail pair; therefore, the left and right sides of the rear Z-direction moving plate can move along the left rear Z-direction feed rail pair and the right rear Z Slide in the Z direction to the feed rail pair;

The radial feed box (9) is arranged radially, and the front and rear ends of the radial feed box (9) are respectively connected and fixed to the front Z-direction moving plate and the rear Z-direction moving plate ;

There are two Z feed screw pairs (17), including a left Z feed screw pair and a right Z feed screw pair; the nut of the left Z feed screw pair and the The nuts of the right Z feed screw pair are respectively fixed with the left and right ends of the radial feed box (9);

There are two toothed belts (16), respectively a left toothed belt and a right-left toothed belt; the Z-direction feed servo motor (15) is fixed on the top of the column (6), and the Z-direction feed One side of the output shaft of the servo motor (15) is linked with the screw rod of the left Z feed screw pair through the left toothed belt; the other side of the output shaft of the Z feed servo motor (15) The side is linked with the lead screw of the right Z-direction feed screw pair through the right toothed belt;

The Z feed servo motor (15) simultaneously drives the screw mandrel of the left Z feed screw pair and the screw mandrel of the right Z feed screw pair to rotate, and the Z feed servo The rotary motion of the output shaft of the motor (15) is simultaneously converted into the linear motion of the left Z-direction feed screw sub-nut and the right Z-direction feed screw sub-nut; and then stably drives the radial feed box ( 9) Perform Z-direction lifting movement along the left front Z-direction feed guide rail, right front Z-direction feed guide rail, left rear Z-direction feed guide rail and right rear Z-direction feed guide rail;

In addition, there are two pairs of radial feed guide rails (11) in total, including: a left radial feed guide rail pair and a right radial feed guide rail pair, respectively installed on the upper part of the radial feed box (9) left and right sides;

The radial feed screw pair (10) is installed inside the radial feed box (9) through a bearing group; the radial feed servo motor (12) is fixedly installed in the radial feed box (9) ) rear portion, and is linked with the screw rod of the radial feed screw pair (10) through a shaft coupling;

The basic structure of processing is thus obtained;

For the turning unit (2), the left and right ends of the tool holder (14) are respectively fixed to the slider of the left radial feed rail pair and the slider of the right radial feed rail pair, And be fixedly connected with the nut of described radial feed lead screw pair (10) simultaneously; Described turning tool (13) is fixed on the front of described tool holder (14); Described radial feed servomotor (12) Driving the screw rod of the radial feed screw pair (10) to rotate, thereby converting the rotational motion of the output shaft of the radial feed servo motor (12) into the radial feed screw pair (10) The linear motion of the nut, and then realize the radial linear motion of the turning tool (13); when the Z-direction feed servo motor (15) stably drives the radial feed box (9) to carry out the Z-direction lifting During motion, drive described turning tool (13) to carry out Z direction linear movement;

For the drilling processing unit (3), the drilling high-speed electric spindle (18) has an automatic tool change mechanism, and the drill bit (19) is installed on the drilling high-speed electric spindle ( 18) front end; and described drilling high-speed electric spindle (18) is fixedly connected with the slide block of described radial feed guide rail pair (11); Start described drilling high-speed electric spindle (18), drive described drill bit ( 19) Perform radial linear motion; when the Z-direction feed servo motor (15) stably drives the radial feed box (9) to carry out the Z-direction lifting movement, it drives the drill bit (19) to carry out the Z-direction movement. move in a straight line;

For the milling processing unit (4), the milling high-speed electric spindle has an automatic tool change mechanism, and the milling cutter (20) is installed on the front end of the milling high-speed electric spindle through an automatic tool change mechanism; and the milling high-speed electric spindle The main shaft is fixedly connected with the slide block of the radial feed rail pair (11); the milling high-speed electric spindle is started to drive the drill bit milling cutter (20) to perform radial linear motion; when the Z-direction feed servo When the motor (15) stably drives the radial feed box (9) to move up and down in the Z direction, it drives the milling cutter (20) to move linearly in the Z direction.

Preferably, the column (6) adopts a gantry structure.

Preferably, the numerically controlled direct-drive turntable unit (5) includes a turntable transition plate (21), a tooling (22) and a numerically controlled direct-drive turntable (23); the turntable transition plate (21) is fixedly mounted on the numerically controlled direct-drive On the T-shaped slot of the turntable (23), the tooling (22) is fixed on the upper part of the turntable transition plate (21); when the CNC direct drive turntable (23) rotates, it drives the turntable transition plate (21) to rotate , and then drive the parts fixed by the tooling (22) to rotate.

The present invention also provides a combined turning-milling-drilling processing method using the above-mentioned turning-milling-drilling combination processing equipment, comprising the following steps:

Step 1, fixing the part to be processed on the turntable transition plate (21) through the tooling (22);

Step 2, the controller starts the CNC direct-drive turntable (23), when the CNC direct-drive turntable (23) rotates, it drives the turntable transition plate (21) to rotate, and then drives the parts fixed by the tooling (22) to rotate; during the rotation of the parts , according to preset processing requirements, control the turning tool (13) to perform Z-direction linear lifting movement and/or control the turning tool (13) to perform radial linear movement and/or control the drill bit (19) to perform Z-direction linear lifting movement and /or control the drill bit (19) to perform radial linear movement and/or control the milling cutter (20) to perform Z-direction linear lifting movement and/or control the milling cutter (20) to perform radial linear movement, thereby realizing the processing of parts.

The turning-milling-drilling combination processing equipment and the turning-milling-drilling combination processing method provided by the present invention have the following advantages:

The invention combines turning and milling, turning and drilling three processing techniques. Effectively improve the processing efficiency of large disc parts.

Description of drawings

Fig. 1 is the schematic diagram of the three-dimensional structure of the turning-milling-drilling combined processing equipment provided by the present invention;

Fig. 2 is the front view of Fig. 1;

Fig. 3 is the three-dimensional structure schematic diagram of the turning processing unit provided by the present invention;

Fig. 4 is the side view of Fig. 3;

Fig. 5 is the front view of Fig. 3;

Fig. 6 is a three-dimensional structural schematic diagram of the drilling processing unit provided by the present invention;

Fig. 7 is a three-dimensional structural schematic diagram of the milling unit provided by the present invention;

Fig. 8 is a schematic diagram of the three-dimensional structure of the numerical control direct drive turntable unit provided by the present invention.

detailed description

In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

1 and 2, the present invention provides a combination of turning, milling and drilling equipment, including: a base 1, a turning unit 2, a drilling unit 3, a milling unit 4 and a CNC direct-drive turntable unit 5; The processing unit 2, the drilling processing unit 3 and the milling processing unit 4 are installed on the base 1 in the shape of "product"; the CNC direct drive turntable unit 5 is installed on the base 1, and is located on the turning processing unit 2, drilling processing unit 3 and the center position of the milling unit 4.

Turning processing unit 2 is shown in Figure 3-5, comprises turning processing basic structure, turning tool 13 and tool holder 14;

Drilling processing unit 3 as shown in Figure 6, comprises drilling processing basic structure, drilling high-speed electric spindle 18 and drill bit 19;

Milling processing unit 4 is shown in Figure 7, comprises milling processing basic structure, milling high-speed electric spindle and milling cutter 20;

Among them, the basic structure of the turning process, the basic structure of the drilling process and the basic structure of the milling process are the same, all including: the column 6, the Z-direction motion drive unit and the radial motion drive unit; the Z-direction motion drive unit and the radial motion drive unit are all assembled On the column 6, it is used to drive the turning tool 13, the drill bit 19 or the milling cutter 20 to move in Z direction or radial direction respectively.

Therefore, first introduce the basic structure of processing:

The column 6 adopts a gantry structure. The Z-direction motion drive unit includes: Z-direction feed rail pair 7, Z-direction moving plate 8, Z-direction feed servo motor 15, toothed belt 16 and Z-direction feed screw pair 17;

The radial motion drive unit includes: a radial feed box 9, a radial feed screw pair 10, a radial feed guide rail pair 11 and a radial feed servo motor 12;

Among them: there are 4 Z-direction feed rail pairs 7, including: left front Z-direction feed rail pair, right front Z-direction feed rail pair, left rear Z-direction feed rail pair and right rear Z-direction feed rail pair, respectively Distributed on the left and right sides in front of the column 6 and on the left and right sides behind the column 6; each Z-direction feed rail pair 7 includes a Z-direction rail, a first Z-direction slider and a second Z-direction slider;

There are two Z-direction mobile plates 8, including: a front Z-direction mobile plate and a rear Z-direction mobile plate; the front Z-direction mobile plate is positioned at the front of the column 6, and the upper and lower ends on the left side of the front Z-direction mobile plate are respectively connected to the left front The 1st Z-direction slider of the Z-direction feed guide pair and the 2nd Z-direction slider of the left front Z-direction feed guide pair are fixed; The 1st Z-direction slider and the 2nd Z-direction slider of the right front Z-direction feed rail pair are fixed; therefore, the left and right sides of the front Z-direction moving plate can move along the left front Z-direction feed rail pair and the right front Z-direction feed rail pair. slide towards

The rear Z-direction moving plate is located behind the column 6, and the upper and lower ends of the left side of the rear Z-direction moving plate are respectively connected with the first Z-direction slider of the left rear Z-direction feed guide rail pair and the left rear Z-direction feed guide rail pair. The 2nd Z-direction slider is fixed; the upper and lower ends of the right side of the rear Z-direction moving plate are respectively fixed with the 1st Z-direction slider of the right rear Z-direction feed guide pair and the 2nd Z-direction slider of the right rear Z-direction feed guide rail pair ; Therefore, the left and right sides of the rear Z-direction moving plate can slide in the Z direction along the left rear Z-direction feed rail pair and the right rear Z-direction feed rail pair;

The radial feed box 9 is arranged radially, and the front and rear ends of the radial feed box 9 are respectively connected and fixed to the front Z-direction moving plate and the rear Z-direction moving plate;

There are two Z feed screw pairs 17, including the left Z feed screw pair and the right Z feed screw pair; the nut of the left Z feed screw pair and the right Z feed screw pair The nuts are respectively fixed with the left and right ends of the radial feed box 9;

There are two toothed belts 16, namely the left toothed belt and the right left toothed belt; the Z-direction feed servo motor 15 is fixed on the top of the column 6, and one side of the output shaft of the Z-direction feed servo motor 15 passes through the left toothed belt. Linkage with the lead screw of the left Z feed screw pair; the other side of the output shaft of the Z feed servo motor 15 is linked with the lead screw of the right Z feed screw pair through the right toothed belt;

The Z feed servo motor 15 simultaneously drives the screw mandrel of the left Z feed screw pair and the screw rod of the right Z feed screw pair to rotate, and the rotary motion of the Z feed servo motor 15 output shaft is simultaneously transformed into The linear motion of the left Z-direction feed screw sub-nut and the right Z-direction feed screw sub-nut; and then stably drive the radial feed box 9 along the left front Z-direction feed guide rail and the right front Z-direction feed guide rail , The left rear Z-direction feed guide rail and the right rear Z-direction feed guide rail carry out the Z-direction lifting movement;

In addition, there are two radial feed guide rail pairs 11, including: a left radial feed guide rail pair and a right radial feed guide rail pair, which are respectively installed on the left and right sides of the upper part of the radial feed box 9;

The radial feed screw pair 10 is installed inside the radial feed box 9 through a bearing group; the radial feed servo motor 12 is fixedly installed at the rear of the radial feed box 9, and is connected with the radial feed through a coupling. The lead screw linkage of lead screw pair 10;

The basic structure of processing is thus obtained;

For the turning processing unit 2, the left and right ends of the tool holder 14 are respectively fixed with the slide block of the left radial feed guide rail pair and the slide block of the right radial feed guide rail pair, and are connected with the radial feed screw pair 10 simultaneously. The nut is fixedly connected; the turning tool 13 is fixed on the front of the tool holder 14; the radial feed servo motor 12 drives the screw mandrel of the radial feed screw pair 10 to rotate, thereby the rotary motion of the output shaft of the radial feed servo motor 12 Converted into the linear motion of the radial feed screw pair 10 nuts, and then realize the radial linear motion of the turning tool 13;

When the Z-direction feed servo motor 15 stably drives the radial feed box 9 to carry out the Z-direction lifting movement, it drives the turning tool 13 to carry out the Z-direction linear movement;

For the drilling processing unit 3, the drilling high-speed electric spindle 18 has an automatic tool change mechanism, and the drill bit 19 is installed on the front end of the drilling high-speed electric spindle 18 by the automatic tool change mechanism; The slider of 11 is fixedly connected; start the drilling high-speed electric spindle 18, and drive the drill bit 19 to carry out radial linear motion; The drill bit 19 performs Z-direction linear motion;

For the milling processing unit 4, the milling high-speed electric spindle has an automatic tool change mechanism, and the milling cutter 20 is installed on the front end of the milling high-speed electric spindle through the automatic tool change mechanism; while the milling high-speed electric spindle is fixedly connected with the slide block of the radial feed guide rail pair 11 ; Start the milling high-speed electric spindle, drive the drill bit milling cutter 20 to carry out radial linear motion; when the Z-direction feed servo motor 15 stably drives the radial feed box 9 to carry out the Z-direction lifting movement, drive the milling cutter 20 to carry out the Z-direction movement; linear motion.

The structure of the CNC direct-drive turntable unit 5 is shown in Figure 8, including a turntable transition plate 21, a tooling 22 and a CNC direct-drive turntable 23; the turntable transition plate 21 is fixedly installed on the T-shaped slot of the CNC direct-drive turntable 23, and the tooling 22 is fixed On the upper part of the turntable transition plate 21; when the CNC direct drive turntable 23 rotates, it drives the turntable transition plate 21 to rotate, and then drives the parts fixed by the tooling 22 to rotate.

The present invention also provides a combined turning-milling-drilling processing method using the above-mentioned turning-milling-drilling combination processing equipment, comprising the following steps:

Step 1, fixing the part to be processed on the transition plate 21 of the turntable through the tooling 22;

Step 2, the controller starts the CNC direct-drive turntable 23. When the CNC direct-drive turntable 23 rotates, it drives the turntable transition plate 21 to rotate, and then drives the parts fixed by the tooling 22 to rotate; during the rotation of the parts, according to the preset processing requirements , control the turning tool 13 to carry out the Z-direction linear movement and/or control the turning tool 13 to carry out the radial linear movement and/or control the drill bit 19 to carry out the Z-direction linear movement and/or control the drill bit 19 to carry out the radial linear movement and/or control The milling cutter 20 performs a Z-direction linear lifting movement and/or controls the milling cutter 20 to perform a radial linear movement, thereby realizing the processing of the parts.

The turning-milling-drilling combination processing equipment and the turning-milling-drilling combination processing method provided by the present invention have the following advantages:

1. The present invention combines the three processing techniques of turning and milling, turning and drilling, which effectively solves the problem of low processing efficiency of large disc parts.

2. The milling unit adopts a high-speed electric spindle, which can effectively solve the burr problem of large disc parts made of composite materials, and can effectively improve the milling quality of composite parts.

3. The turntable adopts CNC direct-drive turntable, which can not only realize high-speed rotation during turning, but also realize indexing rotation during milling and drilling. It has the characteristics of high rotating speed and high indexing accuracy, and can effectively solve the problem of traditional The turntable of the turning-milling combined processing equipment cannot have high speed and precise indexing at the same time, so that the present invention can effectively improve the precision of milling and drilling.

4. All the motors of the present invention adopt servo motors, the guide rail pair adopts rolling linear guide rail pair, and the lead screw pair adopts ball screw pair. The quality of processing of similar parts is guaranteed to the greatest extent.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (6)

1. A turning-milling-drilling combination processing equipment is characterized in that, comprising: base (1), turning processing unit (2), drilling processing unit (3), milling processing unit (4) and numerical control direct drive turntable unit ( 5); wherein, the turning unit (2), the drilling unit (3) and the milling unit (4) are installed on the base (1) in the shape of a “product”; the The CNC direct drive turntable unit (5) is installed on the base (1), and is located at the center of the turning unit (2), the drilling unit (3) and the milling unit (4) Location. 2. The turning-milling-drilling combined processing equipment according to claim 1, characterized in that, the turning unit (2) comprises a turning basic structure, a turning tool (13) and a tool seat (14); The drilling unit (3) includes a basic structure for drilling, a high-speed electric spindle for drilling (18) and a drill bit (19); The milling processing unit (4) includes a milling processing basic structure, a milling high-speed electric spindle and a milling cutter (20); Wherein, the basic structure of the turning process, the basic structure of the drilling process and the basic structure of the milling process are the same, and all include: a column (6), a Z-direction motion drive unit and a radial motion drive unit; the Z-direction motion Both the driving unit and the radial movement driving unit are assembled on the column (6) for respectively driving the turning tool (13), the drill bit (19) or the milling cutter (20) to perform Z-direction movement or radial movement. 3. The turning-milling-drilling combination processing equipment according to claim 1, characterized in that, the Z-direction motion drive unit comprises: Z-direction feed guide rail pair (7), Z-direction moving plate (8), Z-direction feed Give servo motor (15), toothed belt (16) and Z to feed screw pair (17); The radial motion drive unit includes: a radial feed box (9), a radial feed screw pair (10), a radial feed guide rail pair (11) and a radial feed servo motor (12); Wherein: there are 4 Z-direction feed rail pairs (7), including: left front Z-direction feed rail pair, right front Z-direction feed rail pair, left rear Z-direction feed rail pair and right rear Z-direction feed rail pair The guide rail pairs are respectively distributed on the left and right sides in front of the column (6) and on the left and right sides behind the column (6); each of the Z-direction feed guide rail pairs (7) includes a Z-direction guide rail, a second 1Z slider and 2Z slider; There are two Z-direction moving plates (8), including: a front Z-direction moving plate and a rear Z-direction moving plate; the front Z-direction moving plate is located in front of the column (6), and the front Z-direction moving plate is The upper and lower ends on the left side of the moving plate are respectively fixed with the first Z slide block of the left front Z feed guide rail pair and the second Z slide block of the left front Z feed guide rail pair; The upper and lower ends of the right side of the plate are respectively fixed with the first Z-direction slider of the right front Z-direction feed guide pair and the second Z-direction slider of the right front Z-direction feed guide pair; therefore, the front Z-direction movement The left and right sides of the board can slide in the Z direction along the left front Z-direction feed guide pair and the right front Z-direction feed guide pair; The rear Z-direction moving plate is located behind the column (6), and the upper and lower ends of the left side of the rear Z-direction moving plate are respectively connected to the first Z-direction slider of the left rear Z-direction feed rail pair It is fixed with the 2nd Z-direction slider of the left rear Z-direction feed rail pair; It is fixed with the 2nd Z slider of the right rear Z-direction feed rail pair; therefore, the left and right sides of the rear Z-direction moving plate can move along the left rear Z-direction feed rail pair and the right rear Z Slide in the Z direction to the feed rail pair; The radial feed box (9) is arranged radially, and the front and rear ends of the radial feed box (9) are respectively connected and fixed to the front Z-direction moving plate and the rear Z-direction moving plate ; There are two Z feed screw pairs (17), including a left Z feed screw pair and a right Z feed screw pair; the nut of the left Z feed screw pair and the The nuts of the right Z feed screw pair are respectively fixed with the left and right ends of the radial feed box (9); There are two toothed belts (16), respectively a left toothed belt and a right-left toothed belt; the Z-direction feed servo motor (15) is fixed on the top of the column (6), and the Z-direction feed One side of the output shaft of the servo motor (15) is linked with the screw rod of the left Z feed screw pair through the left toothed belt; the other side of the output shaft of the Z feed servo motor (15) The side is linked with the lead screw of the right Z-direction feed screw pair through the right toothed belt; The Z feed servo motor (15) simultaneously drives the screw mandrel of the left Z feed screw pair and the screw mandrel of the right Z feed screw pair to rotate, and the Z feed servo The rotary motion of the output shaft of the motor (15) is simultaneously converted into the linear motion of the left Z-direction feed screw sub-nut and the right Z-direction feed screw sub-nut; and then stably drives the radial feed box ( 9) Perform Z-direction lifting movement along the left front Z-direction feed guide rail, right front Z-direction feed guide rail, left rear Z-direction feed guide rail and right rear Z-direction feed guide rail; In addition, there are two pairs of radial feed guide rails (11) in total, including: a left radial feed guide rail pair and a right radial feed guide rail pair, respectively installed on the upper part of the radial feed box (9) left and right sides; The radial feed screw pair (10) is installed inside the radial feed box (9) through a bearing group; the radial feed servo motor (12) is fixedly installed in the radial feed box (9) ) rear portion, and is linked with the screw rod of the radial feed screw pair (10) through a shaft coupling; The basic structure of processing is thus obtained; For the turning unit (2), the left and right ends of the tool holder (14) are respectively fixed to the slider of the left radial feed rail pair and the slider of the right radial feed rail pair, And be fixedly connected with the nut of described radial feed lead screw pair (10) simultaneously; Described turning tool (13) is fixed on the front of described tool holder (14); Described radial feed servomotor (12) Driving the screw rod of the radial feed screw pair (10) to rotate, thereby converting the rotational motion of the output shaft of the radial feed servo motor (12) into the radial feed screw pair (10) The linear motion of the nut, and then realize the radial linear motion of the turning tool (13); when the Z-direction feed servo motor (15) stably drives the radial feed box (9) to carry out the Z-direction lifting During motion, drive described turning tool (13) to carry out Z direction linear movement; For the drilling processing unit (3), the drilling high-speed electric spindle (18) has an automatic tool change mechanism, and the drill bit (19) is installed on the drilling high-speed electric spindle ( 18) front end; and described drilling high-speed electric spindle (18) is fixedly connected with the slide block of described radial feed guide rail pair (11); Start described drilling high-speed electric spindle (18), drive described drill bit ( 19) Perform radial linear motion; when the Z-direction feed servo motor (15) stably drives the radial feed box (9) to carry out the Z-direction lifting movement, it drives the drill bit (19) to carry out the Z-direction movement. move in a straight line; For the milling processing unit (4), the milling high-speed electric spindle has an automatic tool change mechanism, and the milling cutter (20) is installed on the front end of the milling high-speed electric spindle through an automatic tool change mechanism; and the milling high-speed electric spindle The main shaft is fixedly connected with the slide block of the radial feed rail pair (11); the milling high-speed electric spindle is started to drive the drill bit milling cutter (20) to perform radial linear motion; when the Z-direction feed servo When the motor (15) stably drives the radial feed box (9) to move up and down in the Z direction, it drives the milling cutter (20) to move linearly in the Z direction. 4. The turning-milling-drilling combined processing equipment according to claim 2, characterized in that, the column (6) adopts a gantry structure. 5. The turning-milling-drilling combined processing equipment according to claim 1, characterized in that, the CNC direct-drive turntable unit (5) comprises a turntable transition plate (21), a tooling (22) and a CNC direct-drive turntable (23) The turntable transition plate (21) is fixedly installed on the T-shaped slot of the numerical control direct drive turntable (23), and the tooling (22) is fixed on the upper part of the turntable transition plate (21); the numerical control direct drive When the turntable (23) rotates, it drives the turntable transition plate (21) to rotate, and then drives the parts fixed by the tooling (22) to rotate. 6. A method for combined turning, milling and drilling using the combined turning, milling and drilling equipment according to claim 2, characterized in that it comprises the following steps: Step 1, fixing the part to be processed on the turntable transition plate (21) through the tooling (22); Step 2, the controller starts the CNC direct-drive turntable (23), when the CNC direct-drive turntable (23) rotates, it drives the turntable transition plate (21) to rotate, and then drives the parts fixed by the tooling (22) to rotate; during the rotation of the parts , according to preset processing requirements, control the turning tool (13) to perform Z-direction linear lifting movement and/or control the turning tool (13) to perform radial linear movement and/or control the drill bit (19) to perform Z-direction linear lifting movement and /or control the drill bit (19) to perform radial linear movement and/or control the milling cutter (20) to perform Z-direction linear lifting movement and/or control the milling cutter (20) to perform radial linear movement, thereby realizing the processing of parts.