A double-head CNC drilling and tapping center

Abstract

The present invention discloses a double-head CNC drilling and tapping center, which relates to the field of CNC drilling and tapping technology; specifically, it includes a frame one and a frame two fixed to the frame one and the ground at the same time; the inner side of the frame one is provided with a conveying and transposition assembly for fixing and conveying a workpiece; the front side of the frame two is provided with two groups of processing head assemblies, and the front side of the frame two is provided with a multi-mode drive mechanism for driving the processing head assembly; the processing head assembly includes a slide, a spindle seat fixed to the side wall of the slide, and a spindle rotatably connected to the inner wall of the spindle seat; the side wall of the frame two is fixed with a slide rail, and the slide is slidably matched with the outer wall of the slide rail through an electric slider. The present invention, on the basis of setting two processing head assemblies, designs and optimizes the structure, thereby realizing multiple mode switching of drilling + tapping, double drilling, double tapping, single drilling, and single tapping, while meeting the basic processing functions, and increasing the efficiency of drilling and tapping.

Description

Technical Field

[0001] The present invention relates to the technical field of numerical control drilling and tapping, in particular to a double-head numerical control drilling and tapping center. Background Art

[0002] The CNC drilling and tapping center is a high-precision, high-efficiency CNC machine tool designed for precision processing such as small-diameter drilling and tapping. It is especially suitable for mass production in the fields of 3C electronics, medical devices, precision molds, etc.

[0003] A search revealed that Chinese patent publication number CN218253036U discloses a clamping mechanism for a CNC drilling and tapping machine, comprising a fixed base, a support column disposed on the rear side of the upper end face of the fixed base, a fixed frame disposed on the support column, a drilling and tapping mechanism disposed at the front end of the fixed frame, a drive motor disposed at the upper end of the drilling and tapping mechanism, and a drill bit disposed at the lower end of the drilling and tapping mechanism. The upper side of the fixed base is sequentially provided with a fixed block, a threaded rod, a slider, a slide rail, and a baffle from front to back. A negative pressure pump is disposed on the fixed base, the negative pressure pump being located in front of the support column, and a fan disposed on the negative pressure pump. There are two symmetrically arranged slide rails, the slider slidingly connected on the two slide rails, the threaded rod rotatably connected between the fixed block and the baffle, the threaded rod being positioned above the two slide rails and passing through the slider for rotational connection therein, a rotating wheel disposed at the front side of the fixed block, and the front end of the threaded rod passing through the fixed block and fixedly connected to the rotating wheel.

[0004] The above patent has the following deficiencies: it adopts single-head processing and a single processing mode. Since drilling is required before tapping, its single-mode processing results in low processing efficiency of the entire threaded hole.

[0005] To this end, the present invention proposes a double-head CNC drilling and tapping center. Summary of the Invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a double-head CNC drilling and tapping center.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A double-head CNC drilling and tapping center comprises a first frame and a second frame fixed to both the first frame and the ground; a conveying and transposing assembly for fixing and conveying a workpiece is provided on the inner side of the first frame; two sets of machining head assemblies are provided on the front side of the second frame; and a multi-mode drive mechanism for driving the machining head assemblies is provided on the front side of the second frame;

[0009] The processing head assembly includes a slide, a spindle seat fixed to the side wall of the slide, and a spindle rotatably connected to the inner wall of the spindle seat. The side wall of the frame 2 is fixed with a slide rail, and the slide is slidably matched with the outer wall of the slide rail through an electric slider. The bottom of the spindle is connected to the processing head through a tool handle, and the top of the spindle is connected to a key shaft through a transmission sleeve. The two key shafts are transmission-matched with a multi-mode drive mechanism.

[0010] Preferably: the multi-mode drive mechanism includes an electronically controlled clutch, a continuously variable transmission and a motor fixed to frame 2, the output shaft of the synchronization component is connected to the end of one of the key shafts through a coupling, and the output shaft of the motor is connected to the input shaft of the continuously variable transmission through the synchronization component, the output shaft of the continuously variable transmission is fixedly connected to the input shaft of the electronically controlled clutch, and the output shaft of the electronically controlled clutch is fixedly connected to the end of the other key shaft.

[0011] Furthermore, the key shaft is movably plugged into the inner wall of the transmission sleeve 1, a key slot is provided on the inner wall of the transmission sleeve 1, and a key protrusion which is loosely matched with the key slot is fixed on the outer wall of the key shaft.

[0012] On the basis of the above-mentioned scheme: a limiting groove is provided on the inner wall of the key protrusion, and the inner walls of the two limiting grooves that cooperate with each other are matched with the same synchronization plate, and a screw hole is provided on the inner wall of the limiting groove, and a through hole is provided on the inner wall of the synchronization plate, and the inner wall of the screw hole is connected to a connecting bolt that passes through the through hole through a threaded connection.

[0013] Among the above schemes, a better scheme is: a transmission cylinder 2 is fixed to the bottom of the main shaft, the tool handle is movably connected to the inner wall of the transmission cylinder 2 through a slide, and a transmission groove is opened on the inner side of the transmission cylinder 2, and a transmission protrusion matching the transmission groove is provided on the top of the slide.

[0014] As a further solution of the present invention: the transmission groove and the transmission protrusion are any one of "straight-shaped", "cross-shaped" and "hexagonal-shaped".

[0015] At the same time, the conveying transposition assembly includes a belt / chain transmission assembly arranged on the inner side of the frame and a plurality of support plates located on the periphery of the belt / chain transmission assembly and connected to the belt / chain outer wall of the belt / chain transmission assembly through connecting belts.

[0016] As a preferred embodiment of the present invention: the inner side wall of the frame 1 is provided with a belt / chain transmission assembly parallel to the movement path of the belt / chain transmission assembly, and the side wall of the support plate is fixed with at least two groups of rollers with at least two rollers in each group, and the outer wall of the roller is rotatably connected to a roller, and the roller rolls and cooperates with the inner wall of the belt / chain transmission assembly.

[0017] At the same time, a disassembly plate is provided on one side of the support plate, and a clamping assembly for fixing the workpiece is provided on the outer wall of the disassembly plate.

[0018] As a more optimal solution of the present invention: studs are fixed at the four corners of the outer wall of the support plate, the outer wall of the studs is sleeved with a same disassembly plate, and the outer wall of the disassembly plate is provided with a clamping assembly for fixing the workpiece.

[0019] The beneficial effects of the present invention are:

[0020] 1. The present invention, by setting two processing head components and designing and optimizing the structure, can realize multiple mode switching of drilling + tapping, double drilling, double tapping, single drilling, and single tapping, while meeting the basic processing functions, and increasing the efficiency of drilling and tapping.

[0021] 2. The present invention is capable of performing stepless speed change processing by providing a continuously variable transmission, so that in the drilling + tapping mode, the descending speed and the rotational speed of the two key shafts can be proportionally controlled, thereby ensuring efficiency while preventing the drill from getting stuck.

[0022] 3. The present invention provides a set of multi-mode drive mechanisms for driving, and utilizes a connection method between a key shaft and a transmission sleeve, which can ensure axial sliding on the basis of transmission, so that the motor as a power source is always in a fixed state, preventing the motor wires from being entangled and broken.

[0023] 4. The present invention sets transmission grooves, transmission protrusions and other structures between the main shaft and the tool handle, and uses reaction force and gravity to control the combination and separation of the transmission groove and the transmission protrusion. On the one hand, the cooperation between the transmission groove and the transmission protrusion has a certain longitudinal cooperation range, which can compensate for the errors in the actual rotation speed and lifting speed control to a certain extent, thereby ensuring the reliability of tapping. On the other hand, when not drilling or tapping, there is only a small friction transmission between the transmission cylinder 2 and the tool handle. At this time, even if the worker's clothes or gloves come into contact with the processing head, the processing head will stop immediately and will not entangle them, thereby increasing safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of a double-head CNC drilling and tapping center proposed by the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of a machining head assembly and a multi-mode drive mechanism of a double-head CNC drilling and tapping center proposed by the present invention;

[0026] Figure 3 This is a schematic cross-sectional view of the key shaft and transmission sleeve of a double-head CNC drilling and tapping center proposed by the present invention;

[0027] Figure 4 This is a schematic diagram of the exploded structure of the connection between the synchronization plate and the slide of a double-head CNC drilling and tapping center proposed by the present invention;

[0028] Figure 5 This is a schematic diagram of the overall structure of a conveying and transposing assembly of a double-head CNC drilling and tapping center proposed by the present invention;

[0029] Figure 6 This is a partial structural diagram of a conveying and transposing assembly of a double-head CNC drilling and tapping center proposed by the present invention;

[0030] Figure 7 This is a schematic diagram of the spindle and tool holder structure of a double-head CNC drilling and tapping center proposed by the present invention.

[0031] In the figure: 1. Frame 1; 2. Conveying and transposing assembly; 3. Processing head assembly; 4. Multi-mode drive mechanism; 5. Frame 2; 6. Slide rail; 7. Key shaft; 8. Electric slider; 9. Transmission sleeve 1; 10. Slide seat; 11. Spindle; 12. Tool holder; 13. Processing head; 14. Spindle seat; 15. Electronically controlled clutch; 16. CVT; 17. Synchronizing assembly; 18. Motor; 19. Key cam; 20. Keyway; 21. Limiting groove; 22. Screw hole; 23. Through hole; 24. Synchronizing plate; 25. Connecting bolt; 26. Support plate; 27. Clamping assembly; 28. Stud; 29. ​​Disassembly plate; 30. Connecting belt; 31. Belt / chain transmission assembly; 32. Roller; 33. Roller; 34. Slide plate; 35. Transmission groove; 36. Transmission cam; 37. Transmission cylinder 2. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be further described in detail below in conjunction with specific implementation methods.

[0033] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention. Example

[0034] A double-head CNC drilling and tapping center, such as Figure 1-Figure 7 As shown, it includes a frame 1 and a frame 2 5 fixed to both the frame 1 and the ground. The inner side of the frame 1 is provided with a conveying and transposing assembly 2 for fixing and conveying the workpiece, the front side of the frame 2 5 is provided with two groups of processing head assemblies 3, and the front side of the frame 2 5 is provided with a multi-mode driving mechanism 4 for driving the processing head assembly 3.

[0035] The processing head assembly 3 includes a slide 10, a spindle seat 14 fixed to the side wall of the slide 10, and a spindle 11 rotatably connected to the inner wall of the spindle seat 14. The side wall of the frame 2 5 is fixed with a slide rail 6. The slide 10 is slidably matched with the outer wall of the slide rail 6 through an electric slider 8. The bottom of the spindle 11 is connected to the processing head 13 through the tool handle 12, and the top of the spindle 11 is connected to the key shaft 7 through the transmission sleeve 1 9. The two key shafts 7 are connected to the multi-mode drive mechanism 4.

[0036] The multi-mode drive mechanism 4 includes an electronically controlled clutch 15, a continuously variable transmission 16 and a motor 18 fixed to the frame 2 5. The output shaft of the synchronization component 17 is connected to the end of one of the key shafts 7 through a coupling, and the output shaft of the motor 18 is connected to the input shaft of the continuously variable transmission 16 through the synchronization component 17. The output shaft of the continuously variable transmission 16 is fixedly connected to the input shaft of the electronically controlled clutch 15, and the output shaft of the electronically controlled clutch 15 is fixedly connected to the end of the other key shaft 7.

[0037] The key shaft 7 is movably inserted into the inner wall of the transmission sleeve 9. A key groove 20 is provided on the inner wall of the transmission sleeve 9. A key protrusion 19 that is clearance-matched with the key groove 20 is fixed on the outer wall of the key shaft 7.

[0038] The inner wall of the key protrusion 19 is provided with a limiting groove 21, and the inner walls of the two limiting grooves 21 that cooperate with each other are matched with the same synchronization plate 24, and the inner wall of the limiting groove 21 is provided with a screw hole 22, and the inner wall of the synchronization plate 24 is provided with a through hole 23, and the inner wall of the screw hole 22 is connected to a connecting bolt 25 that passes through the through hole 23 through a thread.

[0039] When the device is in use, when the motor 18 is started, it drives one of the key shafts 7 to rotate on the one hand, and on the other hand drives the other key shaft 7 to rotate through the synchronization component 17-continuously variable transmission 16-electronically controlled clutch 15, thereby driving the main shaft 11 to rotate through the transmission sleeve 9, and then driving the processing head 13 to rotate through the tool handle 12 for drilling and tapping.

[0040] The specific drilling and tapping modes include double-head drilling and tapping and single-head drilling and tapping. Double-head drilling and tapping have three forms: double drilling, double tapping, and drilling + tapping. Single-head drilling and tapping have two forms: drilling and tapping. Their working principles are as follows:

[0041] Drilling + tapping, set the two processing heads 13 as a drill and a tap respectively, and then use the synchronization plate 24 to connect the two groups of slides 10, and use one group of slide rails 6 and key shaft 7, and the other group is follow-up and not connected to the power. At this time, when the workpiece is fixed to the conveying and transposition assembly 2 and transported to the bottom of the drill bit through the conveying and transposition assembly 2, drilling is performed first, and then the conveying and transposition assembly 2 continues to transport, and the workpiece with the drilling completed is transported to the bottom of the tap. At the same time, the next undrilled workpiece is transported to the bottom of the drill bit. At this time, one of the groups of slide rails 6 cooperates with the key shaft 7 to drive the two slides 10 to descend synchronously, and the drill bit and the tap process two workpieces at the same time. In addition, this process requires the electronically controlled clutch 15 to be in a coupled state, and through the speed control of the continuously variable transmission 16, the speed of the drill bit and the speed of the tap are matched with each other.

[0042] For double drilling or double tapping, the processing heads 13 are both set to drills or taps, and the electronically controlled clutch 15 is in the engaged state. The speed ratio of the continuously variable transmission 16 is one to one, ensuring that the two key shafts 7 have the same rotation speed. The conveying and transposition component 2 simultaneously conveys the two workpieces to the bottom of the two drills or taps, and then processes them. After the processing is completed, the conveying and transposition component 2 conveys the distance between the two workpieces and processes the two workpieces again.

[0043] Single drilling or single tapping has the same principle as double drilling or double tapping, the difference is that the synchronization plate 24 is removed, so that the two slides 10 are independent of each other, and the electronically controlled clutch 15 is in a disengaged state and does not transmit, which is the same as the single-station processing in the prior art.

[0044] This device, based on the arrangement of two machining head assemblies 3, designs and optimizes the structure, thereby being able to realize multiple mode switching among drilling + tapping, double drilling, double tapping, single drilling, and single tapping, thereby increasing the efficiency of drilling and tapping while satisfying the basic machining functions.

[0045] In addition, in the drilling + tapping mode, the two slides 10 descend synchronously, and there are strict requirements on the rotation speed and descent speed of the taps. The feed speed of the drill bit is related to the rotation speed. Otherwise, there will be a risk of low feed speed and low efficiency or high feed speed and drill jamming. Based on this:

[0046] This device, by providing a continuously variable transmission 16, can perform stepless speed change processing, so that in the drilling + tapping mode, the descending speed and the rotational speed of the two key shafts 7 can be proportionally controlled, thereby ensuring efficiency while preventing drill jamming.

[0047] In addition, the device is driven by setting up a set of multi-mode drive mechanisms 4, and at the same time, the connection method of the key shaft 7 and the transmission sleeve 9 is used, which can ensure axial sliding on the basis of transmission, so that the motor 18 as the power source is always in a fixed state, preventing the wires of the motor 18 from being entangled and broken. Example

[0048] A double-head CNC drilling and tapping center, such as Figure 7 As shown, in order to solve the safety problem, this embodiment makes the following improvements on the basis of embodiment 1: a transmission cylinder 2 37 is fixed to the bottom of the main shaft 11, the tool handle 12 is movably connected to the inner wall of the transmission cylinder 2 37 through a slide 34, and a transmission groove 35 is provided on the inner side of the transmission cylinder 2 37, and a transmission protrusion 36 matching the transmission groove 35 is provided on the top of the slide 34.

[0049] The transmission groove 35 and the transmission protrusion 36 are any one of “straight-shaped”, “cross-shaped” and “hexagonal”.

[0050] When this embodiment is in use, when the processing head 13 at the bottom contacts the workpiece and is subjected to a reaction force, it will rise, thereby causing the transmission groove 35 to engage with the transmission protrusion 36, and the spindle 11 to cooperate with the tool handle 12 in transmission. Otherwise, the tool handle 12 will move downward due to gravity, and the transmission groove 35 and the transmission protrusion 36 will disengage.

[0051] Since the tap size is fixed during tapping, its descending speed must be strictly matched with the rotation speed. That is, the tap must descend one pitch when it rotates one circle, otherwise the tapping will fail. Based on this:

[0052] This device, by setting a transmission groove 35, a transmission protrusion 36 and other structures between the main shaft 11 and the tool handle 12, uses the reaction force and gravity to control the connection and separation of the transmission groove 35 and the transmission protrusion 36. On the one hand, the cooperation between the transmission groove 35 and the transmission protrusion 36 has a certain longitudinal cooperation range, which can compensate for the errors in the actual rotation speed and lifting speed control to a certain extent, thereby ensuring the reliability of tapping. On the other hand, when not drilling or tapping, there is only a small friction transmission between the transmission cylinder 37 and the tool handle 12. At this time, even if the worker's clothes or gloves come into contact with the processing head 13, the processing head 13 will stop immediately and will not entangle them, thereby increasing safety. Example

[0053] A double-head CNC drilling and tapping center, such as Figure 5 、 6As shown, in order to solve the conveying problem, this embodiment makes the following improvements on the basis of embodiment 1 or 2: the conveying transposition component 2 includes a belt / chain transmission component 31 arranged on the inner side of the frame 1 and a plurality of support plates 26 located on the periphery of the belt / chain transmission component 31 and connected to the belt / chain outer wall of the belt / chain transmission component 31 through a connecting belt 30. The inner wall of the frame 1 is provided with a belt / chain transmission component 31 parallel to the movement path of the belt / chain transmission component 31, and the side wall of the support plate 26 is fixed with at least two groups of rollers 33, and the outer wall of the roller 33 is rotatably connected to the roller 32, and the roller 32 rolls and fits with the inner wall of the belt / chain transmission component 31.

[0054] Studs 28 are fixed to the four corners of the outer wall of the support plate 26, and the outer wall of the studs 28 is provided with a disassembly plate 29. The outer wall of the disassembly plate 29 is provided with a clamping assembly 27 for fixing the workpiece. In this embodiment, the specific type of the clamping assembly 27 is not limited, and it is determined according to the workpiece being processed. The fixture design is a mature technology and will not be elaborated in this embodiment.

[0055] When this embodiment is in use, the workpiece can be fixed by the clamping assembly 27, and the belt / chain transmission assembly 31 can be started to drive the support plate 26 to move through the connecting belt 30, thereby driving the workpiece to move.

[0056] In addition, the device is also equipped with a host computer control box, which has a built-in CNC program that matches the function of the device. Since it is existing technology and no creative work has been done on it, it will not be described in detail.

[0057] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A double-head CNC drilling and tapping center, comprising a frame 1 (1) and a frame 2 (5) fixed to the frame 1 (1) and the ground, characterized in that: The inner side of the frame 1 (1) is provided with a conveying and transposing assembly (2) for fixing and conveying a workpiece, the front side of the frame 2 (5) is provided with two sets of processing head assemblies (3), and the front side of the frame 2 (5) is provided with a multi-mode driving mechanism (4) for driving the processing head assemblies (3); The processing head assembly (3) includes a slide (10), a spindle seat (14) fixed to the side wall of the slide (10), and a spindle (11) rotatably connected to the inner wall of the spindle seat (14); a slide rail (6) is fixed to the side wall of the frame (5); the slide (10) is slidably matched with the outer wall of the slide rail (6) through an electric slider (8); the bottom of the spindle (11) is connected to the processing head (13) through a tool handle (12); the top of the spindle (11) is connected to a key shaft (7) through a transmission sleeve (9); the two key shafts (7) are connected to the multi-mode drive mechanism (4); The multi-mode drive mechanism (4) includes an electronically controlled clutch (15), a continuously variable transmission (16), and a motor (18) fixed to the second frame (5); the output shaft of the synchronization component (17) is connected to the end of one of the key shafts (7) through a coupling, and the output shaft of the motor (18) is connected to the input shaft of the continuously variable transmission (16) through the synchronization component (17); the output shaft of the continuously variable transmission (16) is fixedly connected to the input shaft of the electronically controlled clutch (15), and the output shaft of the electronically controlled clutch (15) is fixedly connected to the end of the other key shaft (7); The key shaft (7) is movably plugged into the inner wall of the transmission sleeve (9), the inner wall of the transmission sleeve (9) is provided with a key groove (20), and the outer wall of the key shaft (7) is fixed with a key protrusion (19) that is clearance-matched with the key groove (20); The inner wall of the key protrusion (19) is provided with a limiting groove (21), the inner walls of the two mutually matching limiting grooves (21) are matched with a same synchronization plate (24), and the inner wall of the limiting groove (21) is provided with a screw hole (22), the inner wall of the synchronization plate (24) is provided with a through hole (23), and the inner wall of the screw hole (22) is connected to a connecting bolt (25) passing through the through hole (23) by a thread. A second transmission cylinder (37) is fixed to the bottom of the main shaft (11), and the tool handle (12) is movably connected to the inner wall of the second transmission cylinder (37) through a slide plate (34). A transmission groove (35) is provided on the inner side of the second transmission cylinder (37), and a transmission protrusion (36) matching the transmission groove (35) is provided on the top of the slide plate (34).

2. A double-head CNC drilling and tapping center according to claim 1, characterized in that: The transmission groove (35) and the transmission protrusion (36) are any one of a "straight-shaped", "cross-shaped" and "hexagonal-shaped".

3. A double-head CNC drilling and tapping center according to claim 1, characterized in that: The conveying transposition assembly (2) comprises a belt / chain transmission assembly (31) arranged on the inner side of the frame (1) and a plurality of support plates (26) located on the periphery of the belt / chain transmission assembly (31) and connected to the belt / chain outer wall of the belt / chain transmission assembly (31) through a connecting belt (30).

4. A double-head CNC drilling and tapping center according to claim 3, characterized in that: The inner side wall of the frame (1) is provided with a belt / chain transmission assembly (31) parallel to the movement path of the belt / chain transmission assembly (31), and the side wall of the support plate (26) is fixed with at least two groups of rollers (33) with at least two rollers in each group, and the outer wall of the roller (33) is rotatably connected to a roller (32), and the roller (32) is rollingly matched with the inner wall of the belt / chain transmission assembly (31).

5. A double-head CNC drilling and tapping center according to claim 4, characterized in that: A disassembly plate (29) is provided on one side of the support plate (26), and a clamping assembly (27) for fixing a workpiece is provided on an outer wall of the disassembly plate (29).

6. A double-head CNC drilling and tapping center according to claim 4, characterized in that: Studs (28) are fixed to the four corners of the outer wall of the support plate (26), and the outer wall of the studs (28) is sleeved with a same disassembly plate (29), and the outer wall of the disassembly plate (29) is provided with a clamping assembly (27) for fixing the workpiece.

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