CN116810388A - Door back type double-spindle machining center for fixed rotary workbench and machining method - Google Patents

Abstract

The application discloses a door back type double-spindle machining center for fixing a rotary workbench and a machining method, wherein the door back type double-spindle machining center comprises a base, the front end of the top surface of the base is fixed with the rotary workbench, the rear end of the top surface is fixed with a door back type gantry, the door back type gantry is connected with a semi-closed square ram spindle device in a sliding manner through a beam guide rail pair, the side surface of the door back type gantry is fixed with a tool magazine, and the side surface of the base is provided with a numerical control centralized control device for controlling the operation of the machining center; according to the door back type double-spindle machining center of the fixed rotary workbench, two semi-closed square ram spindle devices are respectively arranged on two sides of a door back type gantry, and the double spindles of circular parts symmetrically distributed in holes arranged on the fixed workbench are machined simultaneously, so that the efficiency is improved by more than one time; the center lines of the double main shafts and the rotary worktable are on the same plane, so that errors of non-unification of design references and machining references are eliminated, and the machining precision is improved; the high rigidity unique structure of the fixed rotary worktable is adopted, the door width is 15000, phi 1800 parts can be processed, and a small machine tool is used for processing large parts, so that the processing range of the parts is enlarged; the efficient processing method is suitable for circular parts with symmetrical hole systems, and improves the cost performance of the machine tool.

Description

A door-back double-spindle machining center with a fixed rotary table and a machining method

Technical field

The present invention relates to the field of mechanical processing technology, and more specifically to a door-back dual-spindle machining center with a fixed rotary table and an efficient processing method for circular parts with symmetrically distributed hole systems.

Background technique

The vertical machining center is a commonly used CNC machine tool. It consists of a base component, a sliding saddle component, a workbench component, a column component, a spindle box component, and a CNC system. It is widely used due to its simple structure, easy use, and good versatility; but the vertical machining center The C-type machine tool mechanism formed by a single column and a spindle box in a machining center has poor rigidity and cannot adapt to the needs of heavy cutting processing; the single spindle and single tool processing efficiency is low; the mobile worktable has poorer dynamic characteristics than the fixed rotary worktable and cannot adapt to high-speed machining. Finishing requirements; and the X- and Y-direction guides are prone to chips, and the accuracy of the machine tool is poor; it is difficult to adapt to the differentiated needs of different industries, different users, different parts, and different processes; because the existing machine tool products are relatively monotonous, they cannot adapt to strategic needs The demand for high-quality development of emerging industries and the homogenization and vicious competition in the market urgently need to be changed; for this reason, we propose a door-back dual-spindle machining center with a fixed rotary table based on the demand for efficient processing of circular parts with symmetrically distributed holes. and processing methods.

Contents of the invention

In view of this, the present invention provides a door-back dual-spindle machining center with a fixed rotary table and a processing method, aiming to solve the above technical problems.

In order to achieve the above objects, the present invention adopts the following technical solutions:

A door-back type dual-spindle machining center with a fixed rotary workbench, including a base. A rotary workbench is fixed at the top front end of the base, and a door-back type gantry is fixed at the rear end of the top surface. The door-back type gantry passes through a cross beam. The guide rail pair is slidingly connected with a semi-enclosed square ram spindle device, a tool magazine is fixed on the side of the door-back gantry, and a CNC centralized control device for controlling the operation of the machining center is provided on the side of the base.

Preferably, the rotary workbench is a CNC rotary workbench, a pneumatic rotary workbench or a hydraulic rotary workbench.

Preferably, the door-back gantry has an integrated structure of columns and beams, and is provided with reinforcing plates between the left and right columns to improve overall rigidity.

In one preferred structure of the present invention, the number of the semi-closed square ram spindle device is one, and the semi-closed square ram spindle device is slidingly connected in the middle of the cross beam.

Another preferred structure of the present invention is that the number of the semi-closed square ram spindle devices is two, and the semi-closed square ram spindle devices are respectively slidingly connected to both sides of the cross beam.

Preferably, the spindle center lines of the two semi-enclosed square ram spindle devices are on the same plane as the center line of the rotary worktable and parallel to the center line of the crossbeam guide rail.

Preferably, the semi-closed square ram spindle device includes a sliding saddle, a square ram is provided on the sliding saddle, a screw rod is connected to the square ram, and the outside of the screw rod is connected to the square ram through a bearing. The rams are fixed to each other, a servo motor is fixedly connected to one end of the screw rod, a main motor is provided on the front of the square ram, and a synchronous wheel is fixed on the output shaft of the main motor. The synchronous wheel The outside is connected through a synchronous belt and the main shaft. The main shaft is provided with a knife cylinder bracket, and the knife cylinder body is installed on the knife cylinder bracket; side plugs are provided on both sides of the sliding saddle. Iron, the square ram is provided with a front plug iron, and a plug iron locking block is used to lock and fix the side plug iron and the front plug iron.

Preferably, the four sides of the semi-enclosed square ram and the fully enclosed square ram are provided with square guide rails, and the square ram is provided with a balance cylinder to ensure the normal and stable operation of the device. The square ram can Swipe up and down.

Preferably, the CNC centralized control device is a seven-axis control system, used to control two servo motors that move the saddle in the Y direction, two servo motors that move the square ram in the Z direction, and the two main motors and the rotary table. of servo motor.

The invention also provides an efficient processing method for circular parts suitable for symmetrically distributed hole systems, using a door-back dual-spindle machining center with a fixed rotary table for processing, which includes the following steps:

S1. Install the parts on the rotary table; adjust the center of the hole system of the parts to be consistent with the center of the rotary table;

S2. Start the CNC centralized control device to control the operation of the seven servo motors;

S3. Start the two Y-direction servo motors to drive the two Y-direction screw rods to rotate, and adjust the position of the left and right semi-closed square ram spindle devices so that the left and right spindles are above the hole system of the part to be processed;

S4. Start the two main motors. The two main motors pass through the synchronous pulley. The synchronous pulley drives the left and right spindles to rotate, and the spindle drives the tool to rotate;

S5. Start the servo motors that move the two square rams in the Z-direction, drive the two Z-direction screw rods to rotate, and drive the two left and right square rams to move downward and feed; the dual-spindle tool drills and expands the symmetrical hole system of the workpiece. Hinge process processing, completing a process processing cycle;

S6. The servo motor drives the rotary table to rotate, so that the left and right spindles are located above the symmetrically distributed concentric hole system, and then the concentric hole system is processed by the double spindle;

S7. Start the two Y-direction servo motors to drive the two left and right semi-enclosed square ram spindle devices to move left and right along the Y direction so that the spindle is located above the concentric circular hole system of different diameters, and then double-check the concentric circular hole system of different diameters. Spindle machining;

S8. Start the rotary table again or move the position of the left and right semi-closed square ram spindle devices so that the spindle is above the asymmetric hole system. Then continue processing the non-concentric hole system, and finally achieve one-time clamping of the workpiece and complete the symmetrically distributed hole system. Double-spindle high-efficiency machining and asymmetric hole system machining for all processes.

Compared with the existing technology, the present invention discloses a door-back dual-spindle machining center with a fixed rotary table and a machining method. With a unique machine tool structure, it has the following comprehensive beneficial effects:

1. The door-back double-spindle machining center of the fixed rotary table of the present invention. The door-back gantry has an integrated structure of columns and beams, and is provided with reinforcing plates between the left and right columns to improve the overall rigidity. Compared with the vertical machining center, The central column and the gantry machining center have a split structure of column and beam, which greatly enhances the rigidity and can adapt to the needs of heavy cutting and efficient processing.

2. In the door-back dual-spindle machining center of the fixed rotary table of the present invention, the four sides of the square ram slidingly connected through the cross-beam guide rail pair are provided with square guide rails. When the square guide rails of the square ram slide up and down, the four sides are stressed. It is uniform, has better contact rigidity than the T-shaped ram of the gantry machining center, has good accuracy retention and has a long service life.

3. The door-back double-spindle machining center with a fixed rotary table of the present invention has a semi-closed square ram spindle device slidingly connected through a crossbeam guide rail pair. The advantage is that the main motor of the semi-closed square ram spindle device can be installed in front of the spindle. On the side end, the synchronous belt drive is used to achieve deceleration and increase torque, making it suitable for heavy cutting requirements for large torque.

4. The door-back double-spindle machining center with a fixed rotary table of the present invention has two left and right square ram spindle devices and two spindles slidingly connected through a beam guide rail pair, which can process parts or heavy cutting at the same time, thereby improving production efficiency. It is doubled or more than doubled; the structure of slidingly connecting a square ram spindle device and the spindle also has the beneficial effect of improving production efficiency and machining accuracy.

5. In the door-back dual-spindle machining center with a fixed rotary table of the present invention, the dual spindles of the square ram spindle device slidingly connected through the beam guide rail pair are on the same plane as the rotary table; the design benchmark, process benchmark and installation benchmark during processing Consistent, effectively eliminating benchmark non-uniform errors and improving the machining accuracy of hole system parts.

6. The door-back double-spindle machining center with a fixed rotary worktable of the present invention has a rotary worktable fixed on the top and front end of the base. The fixed rotary worktable has a simpler and more rigid structure for moving the X- and Y-direction worktables than a vertical machining center. It is good, and chips will not enter, and the accuracy is maintained well.

7. In the door-back double-spindle machining center with a fixed rotary table of the present invention, the diameter of the fixed rotary table can be larger than the inside of the door-back gantry, that is to say, the diameter of the processed parts can be larger than the inside of the door-back gantry, realizing large-scale processing by small machine tools. Parts, this is something that existing gantry machine tools cannot do. For example, the inner width of the gantry is 1500, and it can process parts of φ1800, which reduces the purchase cost of the machine tool and improves the cost performance of the machine tool.

8. The door-back double-axis machining center with a fixed workbench of the present invention is composed of a door-back high-rigidity structure, high-torque spindle functional components, and a unique structure of a fixed rotary table to form a unique new machine tool that is different from vertical machining centers and gantry machining centers. It has the comprehensive advantages of simple structure, small floor space, low investment, high efficiency and good cost performance.

9. The door-back double-spindle machining center with a fixed workbench of the present invention is particularly suitable for circular parts with symmetrically distributed holes, such as high-efficiency and high-rigidity processing of large flanges in the pump and valve industry, such as high-efficiency and high-precision processing of precision slewing bearings in engineering machinery. processing.

10. The door-back dual-spindle machining center with a fixed rotary table of the present invention is not only suitable for efficient and high-precision machining of circular parts with symmetrically distributed hole systems, but is also suitable for high-efficiency and high-precision machining of some asymmetric hole systems, using fixed rotation. The processing method of the door-back dual-spindle machining center on the workbench is an efficient and high-precision processing method for circular parts based on the symmetrical distribution of hole systems.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the provided drawings without exerting creative efforts.

Figure 1 is a schematic diagram of the overall structure of the door-back dual-spindle machining center with a fixed rotary table according to the present invention;

Figure 2 is a schematic three-dimensional structural diagram of the door-back dual-spindle machining center with a fixed rotary table according to the present invention;

Figure 3 is a schematic structural diagram of a square ram of a door-back dual-spindle machining center with a fixed rotary table according to the present invention;

Figure 4 is a schematic cross-sectional structural diagram of a square ram of a door-back dual-spindle machining center with a fixed rotary table according to the present invention;

Figure 5 is a schematic top structural view of a square ram of a door-back dual-spindle machining center with a fixed rotary table according to the present invention.

in,

1. Base; 2. Rotary table; 3. Door-back gantry; 4. Semi-enclosed square ram spindle device; 5. Left tool magazine; 6. Right tool magazine; 7. CNC centralized control device; 11. Sliding saddle ; 12. Square ram; 13. Lead screw; 14. Servo motor; 15. Main motor; 16. Spindle; 17. Knife cylinder bracket; 18. Knife cylinder body; 19. Side plug iron; 20. Front plug Iron; 21. Iron plug locking block; 22. Balance cylinder; 23. Bearing; 24. Synchronous wheel; 25. Synchronous belt.

Detailed ways

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

Referring to Figures 1 to 2, the present invention provides a door-back double-spindle machining center with a fixed rotary worktable, including a base 1. A rotary worktable 2 is fixed on the top and front end of the base 1. The rotary worktable 2 can be CNC rotary table, pneumatic rotary table or hydraulic rotary table; the fixed rotary table 2 is simpler and more rigid than the vertical machining center table in the X and Y directions; and the chips are not easy to enter, especially suitable for ceramics and graphite It is similar to the processing of dusty parts and has good accuracy retention; the fixed position of the parts installed on the fixed workbench is conducive to robot loading and unloading, and it is a machine tool structure suitable for automatic lines; the diameter of the fixed rotary worktable 2 can be larger than that of the door-back gantry On the inside, that is to say, the diameter of the processed parts can be larger than the inside of the door-back gantry, allowing small machine tools to process large parts. This is the unique working performance of the fixed rotary table 2 for processing round parts, which cannot be achieved by existing gantry, such as the width of the inside of the gantry. 1500. This embodiment can process φ1800 parts, reducing the purchase cost of the machine tool and improving the cost performance of the machine tool; compared with the vertical machining center, the fixed rotary table machine tool structure omits the X-direction moving device, has a more compact structure, better rigidity, and cost performance. better.

The back end of the top surface of the base 1 is fixed with a door-back gantry 3. The door-back gantry 3 is an integrated structure of columns and beams, and there are reinforcement plates between the left and right columns to improve the overall rigidity of the gantry. It is better than the existing gantry columns and beams. The rigidity of the split structure is greatly improved and is suitable for heavy cutting processing; the door-back gantry 3 has two semi-closed square ram spindle devices 4 slidingly connected through the beam guide rail pair. The main motor of the semi-closed square ram spindle device can be installed in front of the spindle. At the side end, the synchronous belt drive is used to achieve deceleration and increase the torque, making it suitable for heavy cutting requirements for large torque; this embodiment also includes two fully enclosed square ram spindle devices that are slidingly connected through the beam track pair, and the main motor is installed At the top of the square ram, it is directly connected to the spindle through the transmission shaft, which is suitable for conventional processing; by setting two semi-enclosed or fully enclosed square ram spindle devices 4 on both sides of the door-back gantry 3, the main shaft device 4 is installed on the fixed rotary Parts on the workbench are processed simultaneously by dual spindles or heavy cutting with high rigidity and high torque by dual spindles. For example, large flanges in the pump and valve industry are processed with high efficiency and high rigidity, and the efficiency is doubled or more than doubled; the present invention is used in the door-back gantry A ram spindle device and a spindle are arranged in the middle, which also has the beneficial effect of improving processing efficiency and processing accuracy.

Please refer to Figures 3 to 5. The semi-closed square ram spindle device 4 includes a sliding saddle 11. A square ram 12 is provided on the sliding saddle 11, and a screw rod 13 is connected to the square ram 12. The outside of the screw rod 13 The bearing 23 and the square ram 12 are fixed to each other, and a servo motor 14 is fixedly connected to one end of the screw rod 13. At the same time, a main motor 15 is provided in front of the square ram 12, and the output shaft of the main motor 15 is fixed There is a synchronous wheel 24, and the outside of the synchronous wheel 24 is connected to the main shaft 16 through a synchronous belt 25, and the main shaft 16 is provided with a knife cylinder bracket 17, and a knife cylinder body 18 is installed on the knife cylinder bracket 17; At the same time, side plug irons 19 are respectively provided on both sides of the sliding saddle 11, and a front plug iron 20 is provided on the square ram 12. A plug iron locking block 21 is used between the side plug iron 19 and the front plug iron 20. Locking and fixing, the square ram 12 can slide up and down, and the four sides of the square ram 12 are equipped with square guide rails. When the square guide rails of the square ram 12 slide up and down, the four sides are evenly stressed, which is better than gantry processing The T-shaped ram in the center has good contact rigidity, good accuracy retention and long service life; the square ram has a shorter spindle throat extension than the vertical machining center and has good rigidity; the square ram has a high rigidity structure and a short spindle throat extension structure. Conducive to achieving efficient processing.

Please refer to Figures 1 to 2. The spindle center lines of the left and right semi-enclosed square ram spindle devices 4 are on the same plane as the center line of the rotary table 2 and parallel to the center line of the crossbeam guide rail. They are precision symmetrical hole system parts. Processing a unique precision machine tool structure, the design datum, process datum and installation datum are consistent during processing, effectively eliminating datum non-uniform errors, which is of great significance for precision machining of hole systems, and the dual spindles are on the same plane as the rotary table and parallel to the center of the crossbeam guide rail , programming is convenient, eliminating the workpiece trial cutting adjustment process, and improving the machining accuracy of hole system parts; for example, precision slewing bearings in the engineering machinery industry are highly efficient and high-precision machining; a left tool magazine 5 and a right tool magazine are fixed on the left side of the door-back gantry. There is a right tool magazine 6 fixed on the side, and the CNC centralized control device 7 on the base 1 is a seven-axis control system, which is used to control the servo motors of the two sliding saddles 11 that move in the Y direction, and the two square rams 12 that move in the Z direction. The main motor 15 and the servo motor on the rotary table 2 use the CNC centralized control device 7 to ensure the control of the double-spindle door-back machining center and ensure the normal operation of the machining center. The CNC centralized control device 7 controls the work of the servo motor. It is a prior art and will not be described in detail here in this application.

The door-back dual-spindle machining center with a fixed rotary table is used to process circular parts with symmetrically distributed holes, forming an efficient and high-precision machining method, which includes the following steps:

S1. Install the parts on the rotary table 2; adjust the center of the hole system of the parts to be consistent with the center of the rotary table;

S2. Start the CNC centralized control device 7 to control the operation of the seven servo motors;

S3. Start the two Y-direction servo motors to drive the two Y-direction screw rods 13 to rotate, and adjust the position of the left and right semi-closed square ram spindle devices 4 so that the two left and right spindles 16 are above the hole system of the part to be processed;

S4. Start the two main motors 15. The two main motors 15 pass through the synchronous pulley 24. The synchronous pulley 25 drives the left and right main shafts 16 to rotate, and the main shaft 16 drives the tool to rotate;

S5. Start the servo motors that move the two square rams in the Z-direction, drive the two Z-direction screw rods to rotate, and drive the two left and right square rams 12 to move downward and feed; the dual-spindle tool drills and expands the symmetrical hole system of the workpiece. The boring and reaming process completes a process cycle;

S6. The servo motor drives the rotary table 2 to rotate, so that the left and right double spindles are located above the symmetrically distributed concentric hole system, and then the concentric hole system is processed by the double spindle;

S7. Start the two Y-direction servo motors to drive the two left and right semi-enclosed square ram spindle devices to move left and right along the Y direction so that the spindle is located above the concentric circular hole system of different diameters, and then double-check the concentric circular hole system of different diameters. Spindle machining;

S8. Start the rotary table again or move the position of the left and right semi-closed square ram spindle devices so that the spindle is above the asymmetric hole system. Then continue processing the non-concentric hole system, and finally achieve one-time clamping of the workpiece and complete the symmetrically distributed hole system. Double-spindle high-efficiency machining and asymmetric hole system machining for all processes.

The door-back dual-spindle machining center with a fixed workbench of the present invention is not only suitable for efficient and high-precision machining of circular parts with symmetrically distributed hole systems, but is also suitable for efficient and high-precision machining of some asymmetric hole systems. It is a kind of symmetrically distributed hole system. An efficient and high-precision new processing method for mainly round parts.

Each embodiment in this specification adopts a fixed rotary table, a door-back type high-rigidity gantry, a dual-spindle high-efficiency device, a semi-enclosed high-torque square ram, a unique precision machine tool structure suitable for precision hole system machining, and an efficient and high-precision machining method. It is described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other, and the relevant parts can be referred to the description of the method section, which together form a This new type of machine tool and method is suitable for efficient machining and high-precision machining of circular parts with symmetrically distributed holes. It has many advantages such as compact structure, space saving, good rigidity and excellent cost performance.

The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be practiced in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A door-back double-spindle machining center with a fixed rotary worktable, including a base (1), characterized in that: a rotary worktable (2) is fixed on the top front end of the base (1), and the top rear end of the base (1) A door-back gantry (3) is fixed, and a semi-closed square ram spindle device (4) is slidingly connected to the door-back gantry (3) through a crossbeam guide rail pair. A knife is fixed on the side of the door-back gantry (3). A CNC centralized control device (7) for controlling the operation of the machining center is provided on the side of the base (1). 2. A door-back double-spindle machining center with a fixed rotary table according to claim 1, characterized in that: the rotary table (2) is a CNC rotary table, a pneumatic rotary table or a hydraulic rotary table. tower. 3. A door-back type dual-spindle machining center with a fixed rotary workbench according to claim 1, characterized in that: the door-back type gantry (3) is an integrated structure of columns and beams, and is between the left and right columns. Equipped with reinforcing plates to increase overall rigidity. 4. A door-back double-spindle machining center with a fixed rotary table according to claim 1, characterized in that: the number of the semi-closed square ram spindle device (4) is one, and the semi-closed square ram spindle device (4) is The ram spindle device (4) is slidably connected to the middle of the beam. 5. A door-back double-spindle machining center with a fixed rotary table according to claim 1, characterized in that: the number of the semi-closed square ram spindle devices (4) is two, and the two semi-closed square ram spindle devices (4) The semi-closed square ram spindle device (4) is slidingly connected to both sides of the beam. 6. A door-back double-spindle machining center with a fixed rotary table according to claim 5, characterized in that: the spindle center lines of the two semi-closed square ram spindle devices (4) are both aligned with the said The center line of the rotary table (2) is on the same plane and parallel to the center line of the cross beam guide rail. 7. A door-back double-spindle machining center with a fixed rotary table according to claim 5, characterized in that: the semi-closed square ram spindle device (4) includes a sliding saddle (11), and the A square ram (12) is provided on the sliding saddle (11), and a screw rod (13) is connected to the square ram (12). The outside of the screw rod (13) is connected to the square ram through a bearing (23). The rams (12) are fixed to each other, a servo motor (14) is fixedly connected to one end of the screw rod (13), and a main motor (15) is provided on the front of the square ram (12). A synchronous wheel (24) is fixed on the output shaft of the main motor (15). The outside of the synchronous wheel (24) is connected to the main shaft (16) through a synchronous belt (25). The main shaft (16) is provided with There is a knife cylinder bracket (17), and a knife cylinder body (18) is installed on the knife cylinder bracket (17); side plug irons (19) are provided on both sides of the sliding saddle (11). The square ram (12) is provided with a front plug iron (20), and a plug iron locking block (21) is used to lock and fix the side plug iron (19) and the front plug iron (20). 8. A door-back double-spindle machining center with a fixed rotary workbench according to claim 7, characterized in that: the four directions of the semi-enclosed square ram (12) and the fully enclosed square ram (12) Each surface is provided with square guide rails, and the square ram (12) is provided with a balance cylinder (22) to ensure the normal and stable operation of the device. The square ram (12) can slide up and down. 9. A door-back double-spindle machining center with a fixed rotary table according to claim 1, characterized in that: the CNC centralized control device (7) is a seven-axis control system used to control two sliding saddles. (11) Servo motors that move in the Y direction, two square rams (12) servo motors that move in the Z direction, two main motors (15) and servo motors on the rotary table (2). 10. An efficient processing method for circular parts with symmetrically distributed holes, characterized by using a door-back dual-spindle machining center with a fixed rotary table as claimed in any one of claims 1 to 9. Processing, including the following steps: S1. Install the parts on the rotary table (2); adjust the center of the hole system of the parts to be consistent with the center of the rotary table; S2. Start the CNC centralized control device (7) to control the operation of the seven servo motors; S3. Start the two Y-direction servo motors to drive the two Y-direction screw rods (13) to rotate, and adjust the position of the left and right semi-closed square ram spindle devices (4) so that the left and right spindles (16) reach the hole system of the part to be processed. above; above S4. Start the two main motors (15). The two main motors (15) pass through the synchronous pulley (24). The synchronous pulley (25) drives the left and right main shafts (16) to rotate, and the main shaft (16) drives the tool to rotate; S5. Start the servo motors that move the two square rams in the Z-direction, drive the two Z-direction screw rods to rotate, and drive the two left and right square rams (12) to move downward and feed; the dual-spindle tool performs the symmetrical hole system on the workpiece. The drilling, expanding, boring and reaming process completes a process cycle; S6. The servo motor drives the rotary table (2) to perform rotational motion so that the left and right spindles are located above the symmetrically distributed concentric hole system, and then the concentric hole system is processed by the double spindle; S7. Start the two Y-direction servo motors to drive the two left and right semi-enclosed square ram spindle devices to move left and right along the Y direction so that the spindle is located above the concentric circular hole system of different diameters, and then double-check the concentric circular hole system of different diameters. Spindle machining; S8. Start the rotary table again or move the position of the left and right semi-closed square ram spindle devices so that the spindle is above the asymmetric hole system. Then continue processing the non-concentric hole system, and finally achieve one-time clamping of the workpiece and complete the symmetrically distributed hole system. Double-spindle high-efficiency machining and asymmetric hole system machining for all processes.