Drilling and tapping device for machining engine case cover

Abstract

The invention relates to the technical field of combined drilling and tapping devices, in particular to a drilling and tapping device for machining an engine case cover, which comprises a frame, a lifting spindle box supported at the top end of the frame, a holder connected to the bottom end of the spindle box, a swinging disc-shaped tool magazine in contact with one side of the spindle box, and the back of the disc-shaped tool magazine hinged to the frame. After the disc-shaped tool magazine drives the drill bit tools to move to the bottom end of the disc-shaped tool magazine in a surrounding mode, the box cover workpiece is drilled and tapped through lifting or rotating of the drill bit tools clamped on the clamping device, and if accidental vibration and translation of the box cover workpiece in machining are detected by the detection table, the box cover workpiece can be detected by the detection table. The pneumatic device works to trigger a releasing mechanism in the clamping device, the clamping device loosens clamping of the drill bit tool, the drill bit tool stops machining the box cover workpiece, and losses caused by unqualified machining are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of combined drilling and tapping devices, in particular to a drilling and tapping device for processing an engine case cover. Background Art

[0002] A drilling and tapping center is a machine tool for cutting metal, also commonly known as a drilling, milling and tapping center. It is mainly used for processing light and small metals. The drilling and tapping center is a machine tool that integrates cutting, drilling and tapping in the current market. When drilling and tapping the engine cover, the disc-type tool magazine transports the specified tool to the liftable drive mechanism. Under the control of the drive mechanism, the tool rotates or lifts to process the engine cover. Before the processing, the engine cover needs to be firmly clamped in the fixture on the workbench. The limit fixture in traditional technology cannot effectively detect the vibration problem in the drilling and tapping operation. If the engine cover is accidentally vibrated and displaced during the tool processing of the engine cover, there are many reasons for the accidental displacement of the engine cover: the operator may cause the product to be displaced due to improper operation during the operation, or fail to keep the machine stable during the drilling process; the positioning device of the drilling and tapping machine may be inaccurate, or there may be problems with the parameter setting of the machine itself, which may cause inaccurate drilling position, resulting in displacement; wear or damage to components such as the drill screw can also cause product displacement. When the product is displaced, the tool needs to stop processing to avoid the problem of unqualified processed products caused by misalignment of the processing points between the tool and the engine cover. For this purpose, the present invention provides a drilling and tapping device for processing the engine cover. Summary of the invention

[0003] The object of the present invention is to provide a drilling and tapping device for machining an engine case cover to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a drilling and tapping device for processing an engine case cover, comprising a frame, a main spindle box with a lifting capacity supported on the top of the frame, a clamp connected to the bottom of the main spindle box, one side of the main spindle box contacts a swinging disc-type tool magazine, the back of the disc-type tool magazine is hinged to the frame, a plurality of drill bits are arranged in a ring on the disc-type tool magazine, and after the disc-type tool magazine drives the drill bit to move around to the bottom of the disc-type tool magazine, the disc-type tool magazine pushes the drill bit at the bottom into the clamp, and the clamp controls the lifting and rotation of the drill bit by clamping the drill bit, one side of the clamp is connected to a pneumatic actuator, the pneumatic actuator is installed on the frame, the bottom end of the frame supports a multi-axis linkage workbench, a detection table is installed on the multi-axis linkage workbench, a case cover workpiece is clamped in the detection table, and the detection table and the pneumatic actuator are connected in air conduction.

[0005] The clamp includes a first cylinder connected to the bottom end of the spindle box, a chuck connected to the bottom end of the first cylinder, a waist assembly sleeved on the first cylinder, a first ring frame arranged above the waist assembly, and a concave flat frame padded between the first ring frame and the waist assembly, wherein the first ring frame includes a ring body and a column vertically fixed on the ring body, and the upper end of the first ring frame column extends into the spindle box.

[0006] The waist assembly includes a compression spring and a disc rack that are movably mounted on the first cylinder, a limiting square column that is vertically fixed to the edge of the disc rack, and two symmetrically distributed unit cross plates that are fixed to the first cylinder. The disc rack is in contact with the concave flat frame, the compression spring is supported between the disc rack and the unit cross plates, and the limiting square column slides through the square hole opened on the unit cross plates.

[0007] The chuck includes a T-plate seat fixed at the bottom end of the first cylinder, two symmetrically distributed ear plates supported on the T-plate seat, a restraining plate vertically fixed to the bottom end of the ear plate, and an inclined push plate fixed to the top end of the ear plate. The plate body on the T-plate seat slides through the plate hole opened in the ear plate, the bottom end of the limiting square column contacts the inclined push plate, and the restraining plate slides and is inserted into the plate hole opened on the root column on the drill tool.

[0008] The chuck also includes two guide slide bars symmetrically fixed on the T-plate seat, and short springs sleeved on the guide slide bars. The guide slide bars slide through the circular holes opened on the ear plates, and the short springs are supported between the ear plates and the T-plate seat.

[0009] The pneumatic actuator includes a positioning box fixed on the frame, a frame column in sliding contact with the positioning box, a stop recessed plate fixed on the positioning box, and an L-shaped hard tube passing through the shell of one end of the positioning box, and one end of the L-shaped hard tube is slidably inserted into a cylindrical groove opened on the frame column.

[0010] The frame column includes a slider and two vertical plate frames fixed on the slider, and the slider is distributed in the plate grooves set on the positioning box. The vertical plate frame of the frame column slides through the inner hole of the flat cylinder fixed at the end of the concave flat frame. The pneumatic actuator also includes a long spring and a long guide rod fixed on the positioning box. One end of the frame column slider is in contact with the stop concave plate, and the other end is in contact with multiple long springs. The long spring passes through the guide long rod, and the guide long rod slides through the column hole opened on the frame column slider.

[0011] The inspection platform includes a feed plate supporting a box cover workpiece, a concave limit frame fixed at the bottom of the feed plate, two rows of unit positioning members supported on the concave limit frame, a supporting flat tube fixed at one end of the concave limit frame, and two soft air tubes fixedly connected to the supporting flat tube, one end of one soft air tube is fixedly connected to an L-shaped hard tube, the two rows of unit positioning members cooperate to clamp the box cover workpiece, and the corners of the feed plate are fixed on the multi-axis linkage workbench by setting columns.

[0012] The unit positioning component includes a block fixed on the discharge plate, a unit plate contacted by one side of the block, a side rod vertically fixed on the unit plate, and a pullback spring piece fixed at one end on the block, the other end of the pullback spring piece is fixed on the unit plate, and the side rod contacts the edge of the box cover workpiece.

[0013] The concave limit frame is a concave folded column, and a row of flat tube cavities is opened in the concave folded column. One end of the flat tube cavity is connected to the outside world, and the other end of the flat tube cavity is connected to the square cavity opened in the concave limit frame. One end of the supporting flat tube is connected to the square cavity of the concave limit frame. The unit plate slides through the groove opened on the concave limit frame, and the flat tube cavity is connected with the plate hole opened on the unit plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention performs drilling and tapping operations on the box cover workpiece by lifting or rotating the drill tool clamped on the clamp. If the box cover workpiece being processed accidentally vibrates and moves horizontally, it will be detected by the inspection table, which will cause the exhaust path in the inspection table to be interrupted, and the exhaust gas will be transferred to the pneumatic actuator. The operation of the pneumatic actuator triggers the release mechanism in the clamp, the clamp releases the clamp on the drill tool, and the drill tool stops processing the box cover workpiece, avoiding losses caused by unqualified processing.

[0016] 2. The present invention sets up a dual control mechanism for the clamping operation in the clamp. One mechanism adopts the drive in the spindle box, so that the clamp works under the control of the CNC program. The other mechanism adopts the control drive from the pneumatic actuator. Once the detection platform detects that the box cover workpiece vibrates and translates, the pneumatic actuator will control the clamp to release the drill tool to avoid problems caused by the drill tool continuing the drilling operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention.

[0018] Figure 2 Schematic diagram of the clamp position.

[0019] Figure 3 Schematic diagram of the pneumatic actuator position.

[0020] Figure 4 Schematic diagram of the clamp structure.

[0021] Figure 5 Schematic diagram of the chuck structure.

[0022] Figure 6 Schematic diagram of the position of the first cylinder.

[0023] Figure 7 Schematic diagram of the pneumatic actuator structure.

[0024] Figure 8 This is a schematic diagram of the test bench structure.

[0025] Fig. 9 It is a schematic diagram of the discharge plate structure.

[0026] Fig.10 It is a schematic diagram of the concave limit frame structure.

[0027] Fig.11 It is a schematic diagram of the unit positioning component structure.

[0028] Fig.12 Schematic diagram of the side rod position.

[0029] In the figure: frame 1, spindle box 2, disc tool magazine 3, drill tool 4, clamp 5, pneumatic device 6, multi-axis linkage workbench 7, inspection table 8, box cover workpiece 9, first ring frame 10, concave flat frame 11, waist assembly 12, first cylinder 13, chuck 14, disc frame 15, limit square column 16, compression spring 17, unit cross plate 18, inclined push plate 19, guide slide bar 20, short spring 21, T-plate seat 22, ear plate 23, restraining plate 24, long spring 25, frame column 26, stop concave plate 27, guide long rod 28, L-shaped hard pipe 29, positioning box 30, discharge plate 31, concave limit frame 32, unit positioning part 33, support flat tube 34, soft air pipe 35, pull-back spring 36, side rod 37, unit plate 38, block 39, flat tube cavity 40. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the technical solutions in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figures 1 to 12 The present invention provides a technical solution: a drilling and tapping device for processing an engine case cover, comprising a frame 1, a main spindle box 2 is supported on the top of the frame 1, a clamp 5 is connected to the bottom of the main spindle box 2, one side of the main spindle box 2 contacts a swinging disc-type tool magazine 3, the back of the disc-type tool magazine 3 is hinged to the frame 1, a plurality of drill tools 4 are arranged on the disc-type tool magazine 3, and after the disc-type tool magazine 3 drives the drill tool 4 to move around to the bottom of the disc-type tool magazine 3, the disc-type tool magazine 3 pushes the drill tool 4 at the bottom into the clamp 5, and the clamp 5 controls the lifting and rotation of the drill tool 4 by clamping the drill tool 4, one side of the clamp 5 is connected to a pneumatic actuator 6, the pneumatic actuator 6 is installed on the frame 1, the bottom end of the frame 1 supports a multi-axis linkage workbench 7, the multi-axis linkage workbench 7 is installed with a detection table 8, a case cover workpiece 9 is clamped in the detection table 8, and the detection table 8 and the pneumatic actuator 6 are connected by air conduction, and the drilling and tapping device of the present invention is installed as a whole inside the CNC center cabinet in the prior art.

[0032] refer to Figure 4 It is understood that the clamp 5 includes a first cylinder 13 connected to the bottom end of the spindle box 2, a chuck 14 connected to the bottom end of the first cylinder 13, a waist assembly 12 sleeved on the first cylinder 13, a first ring frame 10 arranged above the waist assembly 12, and a concave flat frame 11 padded between the first ring frame 10 and the waist assembly 12. The first ring frame 10 includes a ring body and a column vertically fixed on the ring body, and the upper end of the column of the first ring frame 10 extends into the spindle box 2. The spindle box 2 is a prior art machine. The first cylinder 13 is connected to the motor drive mechanism arranged on the spindle box 2, thereby driving the first cylinder 13 to rotate. At the same time, a moving mechanism is arranged in the spindle box 2 to control the extension and positioning of the column of the first ring frame 10.

[0033] refer to Figure 5 It is understood that the waist assembly 12 includes a compression spring 17 and a disc frame 15 that are movably mounted on the first cylinder 13, a limiting square column 16 vertically fixed to the edge of the disc frame 15, and two symmetrically distributed unit cross plates 18 fixed on the first cylinder 13. The disc frame 15 is in contact with the concave flat frame 11, the compression spring 17 is supported between the disc frame 15 and the unit cross plate 18, and the limiting square column 16 slides through the square hole opened on the unit cross plate 18.

[0034] refer to Figure 5 It is understood that the chuck 14 includes a T-plate seat 22 fixed at the bottom end of the first cylinder 13, two symmetrically distributed ear plates 23 supported on the T-plate seat 22, a restraining plate 24 vertically fixed at the bottom end of the ear plate 23, and an inclined push plate 19 fixed at the top end of the ear plate 23. The plate body on the T-plate seat 22 slides through the plate hole opened on the ear plate 23, the bottom end of the limiting square column 16 contacts with the inclined push plate 19, and the restraining plate 24 slides and is inserted into the plate hole opened on the root column on the drill bit tool 4.

[0035] The chuck 14 also includes two guide slide bars 20 symmetrically fixed on the T-plate seat 22 and a short spring 21 sleeved on the guide slide bars 20. The guide slide bars 20 slide through the circular holes opened on the ear plate 23, and the short spring 21 is supported between the ear plate 23 and the T-plate seat 22.

[0036] The lifting of the spindle box 2 drives the first cylinder 13, and then drives the drill tool 4 to lift through the chuck 14, and the rotation of the first cylinder 13 drives the waist assembly 12 and the chuck 14 to rotate synchronously, and the chuck 14 drives the drill tool 4 to rotate. When the drill tool 4 on the disc-type tool magazine 3 is transported to the clamp 5, the chuck 14 completes the clamping of the drill tool 4. Specifically, the first ring frame 10 rises and drives the concave flat frame 11, and then the compression spring 17 rebounds to make the disc frame 15 rise, and the disc frame 15 is relatively away from the unit horizontal The plate 18, the limiting square column 16 rises, the limiting square column 16 no longer blocks the inclined push plate 19, the short spring 21 presses the two ear plates 23 to move away from each other, the two binding plates 24 are separated, the drill tool 4 is transported between the two binding plates 24, the displacement device in the spindle box 2 drives the first ring frame 10 to descend, and through the reverse transmission of reset, the two binding plates 24 finally move close to each other, the binding plates 24 are inserted into the plate holes on the root column of the drill tool 4, and the drill tool 4 is clamped in the chuck 14, Figure 4 and Figure 5 The clamping is completed, and then the drill bit tool 4 is lifted or rotated under the control of the clamp 5.

[0037] refer to Figure 7 It is understood that the pneumatic actuator 6 includes a positioning box 30 fixed on the frame 1, a frame column 26 in sliding contact with the positioning box 30, a stop recessed plate 27 fixed on the positioning box 30, and an L-shaped hard tube 29 passing through the shell of one end of the positioning box 30, and one end of the L-shaped hard tube 29 is slidably inserted into a cylindrical groove opened on the frame column 26.

[0038] The frame column 26 includes a slider and two vertical plate frames fixed on the slider, and the slider is distributed in the plate groove set on the positioning box 30. The vertical plate frame of the frame column 26 slides through the inner hole of the flat cylinder fixed at the end of the concave flat frame 11. The pneumatic actuator 6 also includes a long spring 25 and a guide long rod 28 fixed on the positioning box 30. One end of the slider of the frame column 26 contacts the stop concave plate 27, and the other end contacts multiple long springs 25. The long spring 25 passes through the guide long rod 28, and the guide long rod 28 slides through the column hole opened on the slider of the frame column 26.

[0039] The inspection table 8 includes a discharge plate 31 supporting the box cover workpiece 9, a concave limit frame 32 fixed at the bottom of the discharge plate 31, two rows of unit positioning members 33 supported on the concave limit frame 32, a supporting flat tube 34 fixed at one end of the concave limit frame 32, and two soft air tubes 35 fixedly connected to the supporting flat tube 34, and one end of one soft air tube 35 is fixedly connected to the L-shaped hard tube 29, the two rows of unit positioning members 33 cooperate to clamp the box cover workpiece 9, and the corners of the discharge plate 31 are fixed on the multi-axis linkage workbench 7 by setting columns.

[0040] The unit positioning member 33 includes a block 39 fixed on the discharge plate 31, a unit plate 38 contacted by one side of the block 39, a side rod 37 vertically fixed on the unit plate 38, and a pull-back spring sheet 36 fixed at one end on the block 39, the other end of the pull-back spring sheet 36 is fixed on the unit plate 38, and the side rod 37 contacts the edge of the box cover workpiece 9.

[0041] The concave limit frame 32 is a concave folded cylinder, and a row of flat tube cavities 40 are opened in the concave folded cylinder. One end of the flat tube cavity 40 is connected to the outside, and the other end of the flat tube cavity 40 is connected to the square cavity opened in the concave limit frame 32. One end of the supporting flat tube 34 is connected to the square cavity of the concave limit frame 32. The unit plate 38 slides through the groove opened on the concave limit frame 32, and the flat tube cavity 40 is connected to the plate hole opened on the unit plate 38.

[0042] During the process of the drill tool 4 processing the box cover workpiece 9, if the box cover workpiece 9 vibrates and moves horizontally, the edge of the box cover workpiece 9 will lift up and push part of the side rod 37, and the movement of the side rod 37 will drive the unit plate 38. After the unit plate 38 moves horizontally, the plate holes and the flat tube cavity 40 in the unit plate 38 move in an offset manner, and the arrangement path in the concave limit frame 32 is disconnected. The two soft air tubes 35 connected to the supporting flat tube 34, the first soft air tube 35 is connected to the L-shaped hard tube 29, and the second soft air tube 35 is externally connected to the air injection mechanism in the prior art. The air injection mechanism injects air into the supporting flat tube 34 through the soft air tube 35, and then exhausts air through the flat tube cavity 40 in the concave limit frame 32. The vibration causes the arrangement path in the concave limit frame 32 to be disconnected, and the airflow in the supporting flat tube 34 cannot be injected The airflow in the flat support tube 34 is injected into the L-shaped hard tube 29 through the first soft air tube 35, and then the airflow impacts the frame column 26, which translates. The frame column 26 translates and pulls the concave flat frame 11, and the concave flat frame 11 is pulled out from between the first ring frame 10 and the disc frame 15. Then the disc frame 15 rises under the rebound of the compression spring 17, and the disc frame 15 is relatively close to the first ring frame 10. The disc frame 15 drives the limiting square column 16 to rise, and the limiting square column 16 no longer blocks the inclined push plate 19, so that the short spring 21 presses the two ear plates 23 apart, and the restraining plate 24 is pulled out from the drill bit 4, and the drill bit 4 and the clamp 5 are disconnected. The drill bit 4 that loses drive stops processing the box cover workpiece 9.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A drilling and tapping device for machining an engine cover, comprising a frame (1), characterized in that: The top of the frame (1) supports a lifting spindle box (2), the bottom of the spindle box (2) is connected to a clamp (5), one side of the spindle box (2) contacts a swinging disc-shaped tool magazine (3), the back of the disc-shaped tool magazine (3) is hinged to the frame (1), a plurality of drill tools (4) are arranged around the disc-shaped tool magazine (3), and after the disc-shaped tool magazine (3) drives the drill tools (4) to move around to the bottom of the disc-shaped tool magazine (3), the disc-shaped tool magazine (3) pushes the drill tools (4) at the bottom to the clamp The drill bit (4) is held in a holder (5), and the holder (5) controls the lifting and rotation of the drill bit (4) by holding the drill bit (4). One side of the holder (5) is connected to a pneumatic actuator (6) in a transmission manner. The pneumatic actuator (6) is mounted on a frame (1). The bottom end of the frame (1) supports a multi-axis linkage workbench (7). A detection table (8) is mounted on the multi-axis linkage workbench (7). A box cover workpiece (9) is held in the detection table (8), and the detection table (8) and the pneumatic actuator (6) are connected by air.

2. The drilling and tapping device for machining an engine case cover according to claim 1, characterized in that: The clamp (5) comprises a first cylinder (13) connected to the bottom end of the spindle box (2), a chuck (14) connected to the bottom end of the first cylinder (13), a waist component (12) sleeved on the first cylinder (13), a first ring frame (10) arranged above the waist component (12), and a concave flat frame (11) padded between the first ring frame (10) and the waist component (12), wherein the first ring frame (10) comprises a ring body and a column vertically fixed on the ring body, and the upper end of the column of the first ring frame (10) extends into the spindle box (2).

3. The drilling and tapping device for machining an engine case cover according to claim 2, characterized in that: The waist assembly (12) includes a compression spring (17) and a disc frame (15) movably sleeved on the first cylinder (13), a limiting square column (16) vertically fixed to the edge of the disc frame (15), and two symmetrically distributed unit transverse plates (18) fixed on the first cylinder (13); the disc frame (15) is in contact with the concave flat frame (11), the compression spring (17) is supported between the disc frame (15) and the unit transverse plate (18), and the limiting square column (16) slides through the square hole opened on the unit transverse plate (18).

4. The drilling and tapping device for machining an engine case cover according to claim 3, characterized in that: The chuck (14) comprises a T-plate seat (22) fixed at the bottom end of the first cylinder (13), two symmetrically distributed ear plates (23) supported on the T-plate seat (22), a restraining plate (24) vertically fixed at the bottom end of the ear plate (23), and an inclined push plate (19) fixed at the top end of the ear plate (23); the plate body on the T-plate seat (22) slides through the plate hole opened on the ear plate (23), the bottom end of the limiting square column (16) contacts the inclined push plate (19), and the restraining plate (24) slides and is inserted into the plate hole opened on the root column on the drill tool (4).

5. The drilling and tapping device for machining an engine case cover according to claim 4, characterized in that: The chuck (14) further comprises two guide slide bars (20) symmetrically fixed on the T-plate seat (22), and a short spring (21) sleeved on the guide slide bars (20), the guide slide bars (20) slide through the circular holes provided on the ear plate (23), and the short spring (21) is supported between the ear plate (23) and the T-plate seat (22).

6. The drilling and tapping device for machining an engine case cover according to claim 2, characterized in that: The pneumatic actuator (6) comprises a positioning box (30) fixed on the frame (1), a frame column (26) in sliding contact with the positioning box (30), a stop concave plate (27) fixed on the positioning box (30), and an L-shaped hard pipe (29) penetrating a housing at one end of the positioning box (30), wherein one end of the L-shaped hard pipe (29) is slidably inserted into a cylindrical groove provided on the frame column (26).

7. The drilling and tapping device for machining an engine case cover according to claim 6, characterized in that: The frame column (26) includes a slider and two vertical plate frames fixed on the slider, and the slider is distributed in a plate groove set on the positioning box (30). The vertical plate frame of the frame column (26) slides through the inner hole of the flat cylinder fixed at the end of the concave flat frame (11). The pneumatic actuator (6) also includes a long spring (25) and a long guide rod (28) fixed on the positioning box (30). One end of the slider of the frame column (26) contacts the stop concave plate (27), and the other end contacts a plurality of long springs (25). The long spring (25) passes through the long guide rod (28), and the long guide rod (28) slides through the column hole opened on the slider of the frame column (26).

8. The drilling and tapping device for machining an engine case cover according to claim 6, characterized in that: The inspection platform (8) comprises a material discharging plate (31) supporting a box cover workpiece (9), a concave limiting frame (32) fixed at the bottom of the material discharging plate (31), two rows of unit positioning members (33) supported on the concave limiting frame (32), a supporting flat tube (34) fixed at one end of the concave limiting frame (32), and two soft air tubes (35) fixedly connected to the supporting flat tube (34), and one end of one soft air tube (35) is fixedly connected to an L-shaped hard tube (29). The two rows of unit positioning members (33) cooperate to clamp the box cover workpiece (9), and the corners of the material discharging plate (31) are fixed on the multi-axis linkage workbench (7) by arranging columns.

9. The drilling and tapping device for machining an engine case cover according to claim 8, characterized in that: The unit positioning member (33) includes a blocking block (39) fixed on the discharge plate (31), a unit plate (38) contacted by one side of the blocking block (39), a side rod (37) vertically fixed on the unit plate (38), and a pull-back spring sheet (36) with one end fixed on the blocking block (39), the other end of the pull-back spring sheet (36) being fixed on the unit plate (38), and the side rod (37) being in contact with the edge of the box cover workpiece (9).

10. The drilling and tapping device for machining an engine case cover according to claim 9, characterized in that: The concave limit frame (32) is a concave folded column, and a row of flat tube cavities (40) are provided in the concave folded column, one end of the flat tube cavity (40) is connected to the outside, and the other end of the flat tube cavity (40) is connected to the square cavity provided in the concave limit frame (32), and one end of the supporting flat tube (34) is connected to the square cavity of the concave limit frame (32), the unit plate (38) slides through the groove provided on the concave limit frame (32), and the flat tube cavity (40) is connected to the plate hole provided on the unit plate (38).

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