Special Machine Tool for Matrix Countersunk Holes and Multi-Hole Counterboring of Sheet Metal Parts

Abstract

The present invention relates to the technical field of drilling machines, and discloses a special machine tool for multi-hole counterboring of matrix counterbored holes on sheet metal parts, which includes a base, a lifting mechanism arranged on the base, and a multi-axis cutter installed on the lifting mechanism. A positioning seat protruding upward is arranged on the upper plane of the base directly below the multi-axis cutter to be longitudinally clamped in the square visible hole of the sheet metal part. For the special machine tool for multi-hole counterboring of matrix counterbored holes on sheet metal parts of the present invention, when the sheet metal part is placed on the upper plane of the base, by longitudinally clamping the positioning seat in the square visible hole of the sheet metal part, the horizontal positioning of the sheet metal part can be completed, so that the sheet metal part is not prone to horizontal position deviation during the process of counterboring. The groove formed on the edge of the positioning seat can not only ensure the positioning accuracy of the positioning seat, but also reduce the processing accuracy of the square visible hole in the early stage. Even if the edge of the square visible hole is relatively rough or the size is slightly deviated, it can be smoothly clamped on the positioning seat, further improving the operation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling machines, and particularly to a special machine tool for multi-hole countersinking of matrix countersunk holes in sheet metal parts. Background Art

[0002] The power distribution cabinet is the end device of the power distribution system. For example, the utility model patent with the publication number CN207442246U discloses a similar power distribution cabinet. The power distribution cabinet mainly includes a cabinet body and a cabinet door, and instrument equipment is installed on the cabinet door. As Figure 1 shown, it is a sheet metal part 33 for the power distribution cabinet door in the prior art. Square visible holes 34 for installing instrument equipment are provided on the sheet metal part 33, and mounting holes 35 are provided at the four corners of the square visible holes 34 to fix the instrument equipment by screws. To prevent the screw head part from protruding from the surface of the sheet metal part 33, a countersinking operation needs to be performed on the mounting holes 35. Countersinking is a metal processing method, which refers to processing a cylindrical countersunk hole or a conical countersunk hole on a processed hole. The tool used for countersinking is called a countersink drill, which is generally made of high-speed steel. To improve the countersinking efficiency and accuracy, a multi-axis drilling machine is usually used. The multi-axis drilling machine mainly consists of a base, a lifting mechanism installed on the base, and a multi-axis tool connected to the lifting mechanism. Among them, the base is used to place the sheet metal part, the lifting mechanism is used to drive the multi-axis tool to lift, and the multi-axis tool is input by a single power shaft and then outputs power by multiple output shafts. A countersink drill is installed on each output shaft to achieve multi-hole countersinking of the sheet metal part. For example, the invention patent with the authorization publication number CN104475815B discloses a similar multi-axis tool.

[0003] When the above-mentioned multi-axis drilling machine performs countersinking, it has a high requirement for the positioning accuracy of the sheet metal part. Slight deviation will cause countersinking failure, so there is still room for improvement. Summary of the Invention

[0004] Aiming at the shortcomings of the prior art, the present invention provides a special machine tool for multi-hole countersinking of matrix countersunk holes in sheet metal parts, which can accurately position the sheet metal part during countersinking to improve the accuracy during multi-hole countersinking.

[0005] To solve the above technical problems, the present invention is solved by the following technical solutions:

[0006] A special machine tool for multi-hole countersinking of sheet metal parts with matrix countersunk holes, including a base, a lifting mechanism arranged on the base, and a multi-axis cutter installed on the lifting mechanism. A positioning seat protruding upward is arranged on the upper plane of the base directly below the multi-axis cutter to longitudinally engage with the square visible hole of the sheet metal part; the shape and size of the positioning seat are adapted to the square visible hole, and grooves are provided on the four side edges of the positioning seat. The grooves are strip-shaped and arranged along the edge of the positioning seat; longitudinal sliding grooves are opened on the upper plane of the base at the positions of the four grooves of the positioning seat, and a push plate is slidably engaged in each of the four sliding grooves. The plate surface of the push plate longitudinally adheres to the bottom edge of the corresponding groove, and the thickness of the push plate is greater than the depth of the groove; an inclined surface is opened on the plate surface of the push plate away from the groove. The horizontal distance between the upper edge of the inclined surface and the bottom edge of the groove is less than the horizontal depth of the groove, and the horizontal distance between the lower edge of the inclined surface and the bottom edge of the groove is greater than the horizontal depth of the groove and is located in the sliding groove; a driving mechanism for driving the four push plates to lift synchronously is arranged on the positioning seat.

[0007] With the above scheme, the base is used to place the sheet metal parts to be processed, and the lifting mechanism can drive the multi-axis cutter to lift to realize multi-hole countersinking of the sheet metal parts. When the sheet metal part is placed on the upper plane of the base, by longitudinally engaging the positioning seat with the square visible hole of the sheet metal part, the horizontal positioning of the sheet metal part can be completed, so that the sheet metal part is not prone to horizontal position deviation during the countersinking process, increasing the processing accuracy and efficiency. The grooves opened on the edge of the positioning seat can not only ensure the positioning accuracy of the positioning seat, but also reduce the processing accuracy of the square visible hole in the early stage. Even if the edge of the square visible hole is relatively rough or the size is slightly deviated, it can be smoothly clamped on the positioning seat, further improving the operation efficiency. After the countersinking is completed, in order to improve the convenience of the user to take the sheet metal part, the four push plates located at the four edges of the positioning seat are synchronously lifted by means of the driving mechanism, and the push plates are inserted into the space formed by the groove and the edge of the square visible hole. Under the longitudinal push of the inclined surface, the sheet metal part will have a tendency to lift upward. At the same time, under the transverse extrusion of the inclined surface, the four push plates have a flaring effect, so that the square visible hole can be slightly expanded, so that the positioning seat can be smoothly separated from the square visible hole, further improving the convenience when taking out the sheet metal part.

[0008] Preferably, guiding grooves are longitudinally opened on the two opposite side walls in the sliding groove, and guiding blocks respectively slidably engaged in the two guiding grooves are arranged on the two side edges of the push plate.

[0009] With the above scheme, the sliding clamping cooperation between the guiding block and the guiding groove can ensure the stability and smoothness of the push plate during sliding.

[0010] Preferably, a driving groove is formed at the center of the upper plane of the positioning seat. The driving groove extends longitudinally to the base, and the lower end of the driving groove is flush with the lower end of the sliding groove. Horizontally outward extensions are provided on the side walls of the driving groove corresponding to the four grooves, and each extension is a sliding groove longitudinally arranged and communicates with one of the four sliding grooves. The driving mechanism includes a first driving block and a second driving block. The first driving block is slidably connected in the sliding groove and is integrally provided with the blanking plate. The second driving block is arranged below the first driving block. An inclined first guiding surface is formed at the transition between the side surface and the lower surface of the first driving block away from the blanking plate. A second guiding surface parallel to and abutting against the first guiding surface is formed at a position of the second driving block close to the first driving block. A third guiding surface symmetrical to the second guiding surface is formed on the side of the second driving block away from the blanking plate. A sliding seat is arranged below the second driving block. A guiding groove is formed on the lower side surface of the sliding seat along the direction of the sliding groove. A guide rail is arranged at the bottom of the sliding groove along the opening direction of the sliding groove and is slidably clamped in the guiding groove. A driving member is arranged in the driving groove to longitudinally press the third guiding surface to drive the second driving block to translate towards the blanking plate and cause the first driving block to translate upward.

[0011] With the above scheme, by inserting the driving member into the driving groove and pressing the third guiding surface of the second driving block with the lower end of the driving member, under the extrusion of the third guiding surface, the second driving block can translate towards the blanking plate. During this process, the second guiding surface on the second driving block horizontally presses the first guiding surface on the first driving block. Under the guiding action of the first guiding surface, the first driving block can move upward simultaneously to drive the blanking plate to rise, thus playing a jacking role. The sliding clamping fit between the sliding groove and the guide rail can not only prevent the sliding seat (i.e., the second driving block) from detaching from the bottom of the sliding groove but also ensure the stability and smoothness of the sliding process of the second driving block.

[0012] Preferably, the driving member is in the shape of a round rod and is longitudinally inserted into the driving groove. The edge of the lower end surface of the driving member simultaneously presses against the third guiding surfaces of the four second driving blocks. The upper end of the driving member extends towards both sides to form a gripping member.

[0013] With the above scheme, the driving member in the shape of a round rod has a simple structure. The edge of its lower end surface can simultaneously press against the third guiding surfaces of the four second driving blocks, enabling the entire driving mechanism to operate synchronously. The gripping member can effectively improve the operation convenience of the driving member.

[0014] Preferably, a compression spring is arranged between the lower end of the blanking plate and the bottom of the sliding groove. One end of the compression spring is fixed to the lower side surface of the blanking plate, and the other end is fixed to the bottom of the sliding groove.

[0015] With the above scheme, the second driving block can more easily push the first driving block and the blanking plate upward, improving the operation convenience.

[0016] Preferably, a plug rod vertically extending upward from the bottom of the sliding groove is inserted into the compression spring, and a jack for the plug rod to slide through is formed in the lower side surface of the ejector plate.

[0017] With the above solution, the plug-in fit structure of the plug rod and the jack is simple, which can ensure that the compression spring will not bend during the contraction process and ensure the elastic support performance of the compression spring.

[0018] Preferably, the aperture of the jack is larger than the outer diameter of the plug rod.

[0019] With the above solution, during the movement of the plug rod, the air in the jack can be supplemented or discharged correspondingly, ensuring the smoothness of the movement of the plug rod.

[0020] Preferably, a positioning table is arranged at the bottom of the driving groove, and a tension spring is arranged between the side wall of the positioning table and the corresponding sliding seat to make the sliding seat tend to approach the positioning table.

[0021] With the above solution, when the second driving block is reset, the tension spring can play a boosting role, improving the reset efficiency of the first driving block and the ejector plate.

[0022] Preferably, a limiting block is arranged at one end of the guide rail away from the ejector plate to prevent the guide groove from disengaging from the guide rail in the direction away from the ejector plate.

[0023] With the above solution, the limiting block can effectively prevent the sliding seat and the second driving block from disengaging from the bottom of the sliding groove.

[0024] Preferably, the height of the positioning seat is greater than the thickness of the sheet metal part, and a guiding arc surface is formed at the edge of the excess part.

[0025] With the above solution, the square visible hole on the sheet metal part can be more smoothly clamped on the positioning seat, further improving the working efficiency.

[0026] Due to the adoption of the above technical solutions, the present invention has remarkable technical effects: The base is used to place the sheet metal parts to be processed, and the lifting mechanism can drive the multi-axis tool to lift, so as to achieve the simultaneous countersinking of multiple holes in the sheet metal parts. When the sheet metal part is placed on the upper plane of the base, by longitudinally clamping the positioning seat into the square visible hole of the sheet metal part, the horizontal positioning of the sheet metal part can be completed, making the sheet metal part not prone to horizontal position deviation during the countersinking process, and increasing the processing accuracy and efficiency. The groove opened on the edge of the positioning seat can not only ensure the positioning accuracy of the positioning seat, but also reduce the processing accuracy of the previous square visible hole. Even if the edge of the square visible hole is relatively rough or the size is slightly deviated, it can still be smoothly clamped into the positioning seat, further improving the operation efficiency. After the countersinking is completed, in order to improve the convenience of the user to pick up the sheet metal part, the driving mechanism is used to synchronously lift the four ejector plates located at the four edges of the positioning seat respectively, and make the ejector plates inserted into the space formed by the groove and the edge of the square visible hole. Under the longitudinal push of the inclined plane, the sheet metal part will have a tendency to lift upward. At the same time, under the transverse extrusion of the inclined plane, the four ejector plates have a flaring effect, so that the square visible hole can be slightly expanded, so that the positioning seat can be smoothly separated from the square visible hole, further improving the convenience when taking out the sheet metal part. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of a sheet metal part in the prior art;

[0028] Figure 2 is the structural schematic Figure 1 ;

[0029] Figure 3 is Figure 2 an enlarged schematic view of part A shown in

[0030] Figure 4 is the exploded Figure 1 ;

[0031] Figure 5 is Figure 4 an enlarged schematic view of part B shown in

[0032] Figure 6 is the structural schematic Figure 2 ;

[0033] Figure 7 is the exploded Figure 2 ;

[0034] Figure 8 is Figure 7 an enlarged schematic view of part C shown in

[0035] Figure 9 is the exploded Figure 3 ;

[0036] Figure 10 is Figure 9 An enlarged schematic view of part D shown;

[0037] Figure 11 is Figure 9 An enlarged schematic view of part E shown;

[0038] Figure 12 The cross-section of this embodiment Figure 1 ;

[0039] Figure 13 is Figure 12 An enlarged schematic view of part F shown;

[0040] Figure 14 The cross-section of this embodiment Figure 2 ;

[0041] Figure 15 is Figure 14 An enlarged schematic view of part G shown.

[0042] The names of the parts referred to by each numerical label in the above drawings are as follows: 1. Base; 2. Lifting mechanism; 3. Multi-axis cutter; 4. Positioning seat; 5. Groove; 6. Sliding groove; 7. Pusher plate; 8. Inclined surface; 9. Upper edge; 10. Lower edge; 12. Guide groove; 13. Guide block; 14. Driving groove; 15. Slide groove; 16. First driving block; 17. Second driving block; 18. First guiding surface; 19. Second guiding surface; 20. Third guiding surface; 21. Sliding seat; 22. Guide groove; 23. Guide rail; 24. Driving member; 25. Holding member; 26. Compression spring; 27. Plug rod; 28. Socket; 29. Positioning table; 30. Tension spring; 31. Limit block; 32. Guiding arc surface; 33. Sheet metal part; 34. Square visible hole; 35. Mounting hole. Detailed implementation manners

[0043] The present invention will be further described in detail below in conjunction with the drawings and embodiments.

[0044] As Figures 2 to 11As shown in the figure, a special machine tool for multi-hole counterboring of matrix counterbored holes of sheet metal parts disclosed in this embodiment includes a base 1, a lifting mechanism 2 disposed on the base 1, and a multi-axis cutter 3 mounted on the lifting mechanism 2. This belongs to the well-known common knowledge in the art and will not be elaborated here. A positioning seat 4 protruding upward is provided on the upper plane of the base 1 directly below the multi-axis cutter 3 to be longitudinally clamped in the square visible hole 34 of the sheet metal part 33. The height of the positioning seat 4 is greater than the thickness of the sheet metal part 33, and a guiding arc surface 32 is provided at the edge of the protruding part. In this embodiment, the shape and size of the positioning seat 4 are adapted to the square visible hole 34, that is, it is also square-shaped, so as to improve its positioning accuracy. To reduce the assembly difficulty between the square visible hole 34 and the positioning seat 4, grooves 5 are provided on the four side edges of the positioning seat 4. The grooves 5 are strip-shaped and arranged along the edge of the positioning seat 4. Longitudinal sliding grooves 6 are provided on the upper plane of the base 1 at the positions of the four grooves 5 of the positioning seat 4. A top plate 7 is slidably clamped in each of the four sliding grooves 6. The plate surface of the top plate 7 is longitudinally attached to the bottom edge of the corresponding groove 5, and the thickness of the top plate 7 is greater than the depth of the groove 5, so that it can effectively lift the sheet metal part 33. An inclined surface 8 is provided on the plate surface of the top plate 7 away from the groove 5. The horizontal distance between the upper edge 9 of the inclined surface 8 and the bottom edge of the groove 5 is less than the horizontal depth of the groove 5. The horizontal distance between the lower edge 10 of the inclined surface 8 and the bottom edge of the groove 5 is greater than the horizontal depth of the groove 5 and is located in the sliding groove 6. A driving mechanism is provided on the positioning seat 4 for driving the four top plates 7 to lift and lower synchronously.

[0045] To improve the stability and smoothness of the top plate 7 during the lifting and lowering process, guiding grooves 12 are longitudinally provided on the two opposite side walls in the sliding groove 6. Guide blocks 13 that are respectively slidably clamped in the two guiding grooves 12 are provided on the two side edges of the top plate 7.

[0046] In this embodiment, a driving groove 14 is formed at the center of the upper plane of the positioning seat 4. The driving groove 14 is cylindrical and extends longitudinally to the base 1, and the lower end of the driving groove 14 is flush with the lower end of the sliding groove 6. Horizontal chutes 15 communicating with the four sliding grooves 6 respectively extend outward from the side walls of the driving groove 14 corresponding to the four grooves 5, and each chute 15 is arranged longitudinally. The driving mechanism includes a first driving block 16 and a second driving block 17. The first driving block 16 is slidably connected in the chute 15 and is integrally provided with the ejector plate 7. The second driving block 17 is arranged below the first driving block 16. An inclined first guiding surface 18 is formed at the transition between the side surface and the lower surface of the first driving block 16 away from the ejector plate 7. A second guiding surface 19 parallel to and abutting against the first guiding surface 18 is formed at a position of the second driving block 17 close to the first driving block 16. A third guiding surface 20 symmetrical to the second guiding surface 19 is formed on one side of the second driving block 17 away from the ejector plate 7. A sliding seat 21 is arranged below the second driving block 17. A guiding groove 22 is formed on the lower side surface of the sliding seat 21 along the direction of the chute 15. A guide rail 23 slidably engaged in the guiding groove 22 is arranged at the bottom of the chute 15 along the opening direction of the chute 15. The cross sections of the guiding groove 22 and the guide rail 23 are both trapezoidal to improve the smoothness and stability of their sliding engagement. A driving member 24 is arranged in the driving groove 14 to longitudinally press the third guiding surface 20 to drive the second driving block 17 to translate towards the ejector plate 7 and make the first driving block 16 translate upward. The driving member 24 is in the shape of a round rod and is longitudinally inserted into the driving groove 14, and the edge of the lower end surface of the driving member 24 simultaneously presses against the third guiding surfaces 20 of the four second driving blocks 17. Wherein, the outer diameter of the driving member 24 is equal to or slightly smaller than the inner diameter of the driving groove 14, so that the driving member 24 can stably and smoothly slide longitudinally in the driving groove 14 and is not prone to tilt, so that the edge of the lower end surface of the driving member 24 can simultaneously abut against the third guiding surfaces 20 of the four second driving blocks 17. To improve the operation convenience of the driving member 24, holding members 25 extend from the upper end of the driving member 24 to both sides.

[0047] To improve the operation convenience when the ejector plate 7 rises, a compression spring 26 is arranged between the lower end of the ejector plate 7 and the bottom of the sliding groove 6. One end of the compression spring 26 is fixed to the lower side surface of the ejector plate 7, and the other end of the compression spring 26 is fixed to the bottom of the sliding groove 6. To prevent the compression spring 26 from bending during the contraction process, a plug rod 27 inserted into the compression spring 26 vertically extends upward from the bottom of the sliding groove 6, and a jack 28 for the plug rod 27 to slide through is formed on the lower side surface of the ejector plate 7. The aperture of the jack 28 is larger than the outer diameter of the plug rod 27, so that the air in the jack 28 can be supplemented and discharged correspondingly during the movement of the plug rod 27.

[0048] To assist the second driving block 17 during the reset process, a positioning platform 29 is provided at the bottom of the driving groove 14. A tension spring 30 is arranged between the side wall of the positioning platform 29 and the corresponding sliding seat 21 to make the sliding seat 21 tend to approach the positioning platform 29. In this embodiment, both ends of the tension spring 30 are respectively fixed to two opposite side surfaces of the sliding seat 21 and the positioning platform 29 by welding.

[0049] To prevent the second driving block 17 from detaching from the bottom of the sliding groove 15, a limiting block 31 is provided at one end of the guide rail 23 away from the ejector plate 7 to prevent the guiding groove 22 from detaching from the guide rail 23 in the direction away from the ejector plate 7.

[0050] The specific operation process is as follows:

[0051] As Figures 12 to 15 shown, when performing the countersinking operation, first remove the driving member 24 from the driving groove 14 by means of the holding member 25. Under the action of the tension spring 30, the second driving block 17 resets. At the same time, under the push of the compression spring 26, the ejector plate 7 together with the first driving block 16 rises, and the inclined surface 8 exceeds the upper end surface of the positioning seat 4, and the second guiding surface 19 is separated from the first guiding surface 18. At this time, the square visible hole 34 on the sheet metal part 33 can be sleeved on the four ejector plates 7 first, so that the inclined surfaces 8 on the four ejector plates 7 can respectively abut against the four edges of the square visible hole 34, thereby completing the preliminary positioning. Then, overcome the elastic supporting force of the compression spring 26 and press the sheet metal part 33 downward until the positioning seat 4 is longitudinally clamped into the square visible hole 34 of the sheet metal part 33 by means of the guiding arc surface 32. During this process, due to the longitudinal extrusion of the inclined surface 8, the four ejector plates 7 and the first driving block 16 integrally connected to the ejector plate 7 slide downward synchronously, and at the same time the compression spring 26 becomes in a compressed state. When the positioning seat 4 is completely clamped into the square visible hole 34, the first guiding surface 18 on the first driving block 16 abuts against the second guiding surface 19 of the second driving block 17. At this time, the countersinking operation can be performed on the mounting hole 35 on the sheet metal part 33 through the lifting mechanism 2 and the multi-axis cutter 3.

[0052] After countersinking is completed, first drive the multi-axis cutter 3 away from the positioning seat 4 through the lifting mechanism 2, then insert the driving member 24 into the driving groove 14, and press down the driving member 24 with the gripping members 25 on both sides, so that the edge of the lower end surface of the driving member 24 presses downward against the third guiding surface 20 on the four second driving blocks 17. After the third guiding surface 20 receives the downward pressure, it can drive the second driving block 17 to translate in the direction close to the ejector plate 7. Under the combined action of the second guiding surface 19 and the first guiding surface 18, and with the assistance of the compression spring 26, the first driving block 16 together with the ejector plate 7 moves upward, so that the upper end of the ejector plate 7 is inserted into the space formed by the groove 5 and the edge of the square visual hole 34 until the inclined surface 8 longitudinally abuts against the edge of the square visual hole 34. Under the longitudinal support of the inclined surface 8, if the clamping of the square visual hole 34 and the positioning seat 4 is relatively smooth, it can directly lift the sheet metal part 33 upward from the positioning seat 4. If the clamping of the square visual hole 34 and the positioning seat 4 is relatively tight, then during the process of the inclined surface 8 squeezing the square visual hole 34 upward, a squeezing force can be formed in the horizontal direction at the same time to expand the mouth of the square visual hole 34. Under the combined action of the longitudinal and transverse thrusts, the square visual hole 34 can smoothly disengage from the positioning seat 4, and at the same time the sheet metal part 33 can form a certain distance from the base 1, enabling the user to more conveniently remove the sheet metal part 33 from the base 1.

Claims

1. A special machine tool for multi-hole counterboring of matrix counterbored holes on sheet metal parts, comprising a base (1), a lifting mechanism (2) arranged on the base (1), and a multi-axis cutter (3) installed on the lifting mechanism (2), characterized in that: On the upper plane of the base (1) and directly below the multi-axis cutter (3), there is an upwardly protruding positioning seat (4) which is longitudinally clamped in the square visual hole (34) of the sheet metal part (33); the shape and size of the positioning seat (4) are adapted to the square visual hole (34), and grooves (5) are provided on the four side edges of the positioning seat (4). The grooves (5) are strip-shaped and are arranged along the edge of the positioning seat (4); on the upper plane of the base (1) and at the positions of the four grooves (5) of the positioning seat (4), sliding grooves (6) are longitudinally provided. In each of the four sliding grooves (6), a push plate (7) is slidably clamped. The plate surface of the push plate (7) longitudinally adheres to the bottom edge of the corresponding groove (5), and the thickness of the push plate (7) is greater than the depth of the groove (5); on the plate surface of the push plate (7) away from the groove (5), an inclined surface (8) is provided. The horizontal distance between the upper edge (9) of the inclined surface (8) and the bottom edge of the groove (5) is less than the horizontal depth of the groove (5), and the horizontal distance between the lower edge (10) of the inclined surface (8) and the bottom edge of the groove (5) is greater than the horizontal depth of the groove (5) and is located in the sliding groove (6); a driving mechanism is provided on the positioning seat (4) for driving the four push plates (7) to move up and down synchronously. In the center of the upper plane of the positioning seat (4), a driving groove (14) is provided. The driving groove (14) extends longitudinally to the base (1), and the lower end of the driving groove (14) is flush with the lower end of the sliding groove (6); corresponding to the side walls of the four grooves (5), the driving groove (14) extends horizontally outwards to form sliding grooves (15) respectively communicating with the four sliding grooves (6). Each sliding groove (15) is longitudinally arranged; the driving mechanism includes a first driving block (16) and a second driving block (17). The first driving block (16) is slidably connected in the sliding groove (15) and is integrally provided with the push plate (7). The second driving block (17) is arranged below the first driving block (16); between the side surface and the lower surface of the first driving block (16) away from the push plate (7), there is an inclined first guiding surface (18). At a position close to the first driving block (16) of the second driving block (17), a second guiding surface (19) is provided which is parallel to and abuts against the first guiding surface (18). On one side of the second driving block (17) away from the push plate (7), a third guiding surface (20) is provided which is symmetric to the second guiding surface (19); below the second driving block (17), a sliding seat (21) is provided. On the lower side surface of the sliding seat (21), a guiding groove (22) is provided along the direction of the sliding groove (15). At the bottom of the sliding groove (15), a guide rail (23) is provided which is slidably clamped in the guiding groove (22) along the opening direction of the sliding groove (15); in the driving groove (14), a driving member (24) is provided which longitudinally presses the third guiding surface (20) to drive the second driving block (17) to translate towards the direction close to the push plate (7) and make the first driving block (16) translate upwards. The driving member (24) is in the shape of a round rod and is longitudinally inserted into the driving groove (14). Moreover, the edge of the lower end surface of the driving member (24) is simultaneously pressed against the third guiding surfaces (20) of the four second driving blocks (17); the upper end of the driving member (24) extends towards both sides to form a holding member (25); A compression spring (26) is arranged between the lower end of the ejector plate (7) and the bottom of the sliding groove (6). One end of the compression spring (26) is fixed to the side surface of the lower end of the ejector plate (7), and the other end of the compression spring (26) is fixed to the bottom of the sliding groove (6).

2. The special-purpose machine tool for multi-hole counterboring of matrix counterbored holes of sheet metal parts according to claim 1, characterized in that: Guide grooves (12) are longitudinally formed in the two opposite side walls in the sliding groove (6), and guide blocks (13) respectively slidably clamped in the two guide grooves (12) are arranged on the two side edges of the ejector plate (7).

3. The special-purpose machine tool for multi-hole counterboring of matrix counterbored holes of sheet metal parts according to claim 1, wherein: A plug rod (27) vertically extending upward from the bottom of the sliding groove (6) is inserted into the compression spring (26), and a jack (28) for the plug rod (27) to slidably pass through is formed in the side surface of the lower end of the ejector plate (7).

4. The special-purpose machine tool for multi-hole countersinking of sheet metal parts matrix according to claim 3, characterized in that: The aperture of the jack (28) is larger than the outer diameter of the plug rod (27).

5. The special-purpose machine tool for multi-hole counterboring of matrix counterbored holes of sheet metal parts according to claim 1, wherein: A positioning table (29) is arranged at the bottom of the driving groove (14), and a tension spring (30) is arranged between the side wall of the positioning table (29) and the corresponding sliding seat (21) to make the sliding seat (21) tend to approach the positioning table (29).

6. The special-purpose machine tool for multi-hole countersinking of matrix countersunk holes of sheet metal parts according to claim 1, wherein: A limiting block (31) is arranged at one end of the guide rail (23) away from the ejector plate (7) to prevent the guide groove (22) from disengaging from the guide rail (23) in the direction away from the ejector plate (7).

7. The special-purpose machine tool for matrix counterbored multi-hole flush reaming of sheet metal parts according to any one of claims 1 to 6, characterized in that: The height of the positioning seat (4) is greater than the thickness of the sheet metal part (33), and a guiding arc surface (32) is formed at the edge of the excess part.

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