Multi-shaft cutter for machining center

Abstract

The utility model discloses a multi-shaft cutter for a machining center. The multi-shaft cutter comprises a taper shank shaft, a gear transmission assembly, a driven shaft assembly and a cutter body. The gear transmission assembly is sleeved on the taper shank shaft; the driven shaft assembly is sleeved with the gear transmission assembly; the gear transmission assembly comprises a rear body, a gear set and a front body. The gear set comprises a driving gear and a plurality of driven gears; the driven shaft assembly comprises a plurality of driven shafts, and the driven shafts are used for being connected with cutters; the gear set is arranged between the rear main body and the front main body, and each driven gear in the gear set is connected with each driven shaft in the multiple driven shafts in a sleeving mode so that the driven gears can drive the corresponding driven shafts to rotate under the condition that the driving gears rotate. When the multi-shaft cutter is used for deep hole machining, at least two holes can be drilled and tapped at the same time, a large amount of cutting time is effectively saved, the production efficiency is improved, the machining cycle time can be effectively shortened, and the problem that the machining speed is low is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to processing center technical field, especially a kind of multi-shaft cutter for machining center. BACKGROUND

[0002] With the development of modern manufacturing towards high precision, high efficiency, high automation, single-shaft cutter is constantly innovated. For example, in the field of aerospace, precision instrument manufacturing, etc., parts with complex shape and high precision need to be processed, and the precision and performance of single-shaft cutter are constantly improved to meet these needs.

[0003] The number of cutting edges of single-shaft cutter is relatively small, and the number of cutting edges participating in cutting is limited at the same speed, resulting in low material removal rate and slow processing speed. For example, single-edge milling cutter is slower than double-edge milling cutter. Currently, machining center usually uses single-shaft cutter, so the processing efficiency is low. SUMMARY

[0004] In view of the above problems, the utility model is provided to overcome the above problems or at least partially solve the above problems.

[0005] In the first aspect, the utility model provides a multi-shaft cutter for machining center, comprising:

[0006] taper shank shaft, gear transmission assembly, driven shaft assembly and cutter;

[0007] The gear transmission assembly is sleeved on the taper shank shaft; the driven shaft assembly is sleeved with the gear transmission assembly; the gear transmission assembly comprises rear body, gear set and front body; the gear set comprises driving gear and a plurality of driven gears; the driven shaft assembly comprises a plurality of driven shafts, and the driven shafts are used to connect with the cutter;

[0008] The gear set is arranged between the rear body and the front body, and each driven gear in the gear set is sleeved with one driven shaft in the plurality of driven shafts, so that the driven gear drives the corresponding driven shaft to rotate under the rotation of the driving gear.

[0009] In one embodiment, the above-mentioned multi-shaft cutter for machining center, the gear transmission assembly further comprises driving gear bearing set;

[0010] The driving gear bearing set comprises bearing end cover, angular contact ball bearing and deep groove ball bearing;

[0011] The rear body is provided with first rear body counterbore; the front body is provided with first front body counterbore; the outer side of the first rear body counterbore is provided with deep groove ball bearing, and the inner side is provided with angular contact ball bearing; the first front body counterbore is provided with deep groove ball bearing;

[0012] The deep groove ball bearing provided on the outer side of the first rear main body countersunk hole, the angular contact ball bearing provided on the inner side, and the deep groove ball bearing provided in the first front main body countersunk hole are all sleeved on the tapered shank shaft;

[0013] The drive gear is connected to the tapered shank shaft via a key and is positioned between the deep groove ball bearing located on the outer side of the first rear main body countersunk hole and the deep groove ball bearing located on the first front main body countersunk hole.

[0014] In one embodiment, the gear transmission assembly of the multi-axis cutting tool for a machining center described above further includes multiple driven gear bearing groups;

[0015] Each driven gear bearing assembly includes a pair of angular contact bearings and a pair of deep groove ball bearings;

[0016] The rear main body has multiple second rear main body countersunk holes; the front main body has multiple second front main body countersunk holes; a pair of deep groove ball bearings are disposed inside the corresponding second rear main body countersunk holes; a pair of angular contact ball bearings are disposed inside the corresponding second front main body countersunk holes;

[0017] Each driven gear is disposed between the pair of deep groove ball bearings and the pair of angular contact ball bearings.

[0018] In one embodiment, the gear transmission assembly of the multi-axis cutting tool for a machining center described above further includes a front cover; the front cover is disposed on the front body;

[0019] The front cover has multiple holes, and each driven shaft passes through the corresponding hole on the front cover and is sleeved with the corresponding pair of angular contact ball bearings, driven gears and the pair of deep groove ball bearings.

[0020] In one embodiment, in the multi-axis tool for machining centers described above, when the driven shaft is engaged with the pair of deep groove ball bearings, the end of the driven shaft is limited by a lock nut.

[0021] In one embodiment, the multi-axis tool for a machining center described above further includes a driven axis sleeve in the driven axis assembly; the driven axis sleeve includes a spring sleeve and a tool holder nut.

[0022] The tool holder nut is sleeved with the spring collet; the tool holder nut is connected to the driven shaft; the driven shaft is connected to an external cutting tool through the spring collet.

[0023] In one embodiment, the gear transmission assembly of the multi-axis cutting tool for a machining center described above further includes a stop mechanism; the stop mechanism includes a stop ring, a stop block, a positioning bolt, and a plunger spring;

[0024] The stop ring is sleeved on the tapered shank shaft;

[0025] The rear main body is provided with a plunger hole and a positioning bolt hole; the stop block is provided with a countersunk hole;

[0026] The positioning bolt passes through the through hole of the stop block and the positioning bolt hole, and is fixedly connected to the rear body; a groove is provided on the ring surface of the stop ring, and one side of the stop block has a boss that mates with the groove in a vertical direction; the plunger spring is disposed in the plunger hole, and when the groove and the boss are engaged, the spring presses against the stop block to limit the stop block.

[0027] In one embodiment, the rear body of the multi-axis cutting tool for a machining center described above is also connected to the stop block via a first locating pin.

[0028] In one embodiment, the gear transmission assembly of the multi-axis cutting tool for a machining center further includes an oil-free bushing; the oil-free bushing is disposed in the countersunk hole of the stop block.

[0029] In one embodiment, the front and rear bodies of the multi-axis cutting tool for the machining center are fixed in relative position by a second locating pin.

[0030] The beneficial effects of the above-mentioned technical solutions provided by the embodiments of this utility model include at least the following:

[0031] The multi-axis cutting tool for machining centers provided in this embodiment of the invention can support drilling and tapping of at least two holes simultaneously during deep hole machining, effectively saving a significant amount of cutting time and improving production efficiency. Moreover, the weight and dimensions of this multi-axis cutting tool meet the requirements of the machining center's tool head ATC quick tool change, supporting ATC quick tool change without reducing machining conditions, reducing machining cycle time, and solving the current machining bottleneck problem.

[0032] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0033] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0034] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0035] Figure 1 This is a schematic diagram of the structure of a multi-axis tool for a machining center before assembly in an embodiment of this utility model;

[0036] Figure 2 This is a schematic diagram of the assembled structure of a multi-axis tool for a machining center in an embodiment of this utility model;

[0037] Explanation of reference numerals in the attached figures:

[0038] 1- Tapered shank shaft; 2- Flat key; 3- Stop ring; 4- End cover; 5- Oil seal of drive gear bearing assembly; 6- Deep groove ball bearing; 7- Rear body; 8- Angular contact ball bearing; 9- Gear assembly; 10- First sealing ring; 11- Front body; 12- Oil seal of driven gear bearing assembly; 13- Second sealing ring; 14- Front cover; 15- Driven shaft; 16- Spring sleeve; 17- Tool holder nut; 18- Locating bolt; 19- Oil-free bushing; 20- Stop block; 21- First locating pin; 22- Plunger spring; 23- Second locating pin; 24- Locking nut. Detailed Implementation

[0039] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0040] The inventors of this invention discovered that current machining centers typically use single-axis tools. When machining deep holes, they mostly use cycle commands to drill / tape one hole at a time. When machining workpieces with many and deep holes using single-axis tools, the machining cycle time is long, affecting production efficiency. Furthermore, the automatic tool changer (ATC) of the machining center has strict requirements on the width, length, and overall weight of the tools during rapid tool changes.

[0041] Based on the above problems, this utility model provides a multi-axis cutting tool for a machining center, referring to... Figure 1 As shown, the multi-axis tool specifically includes:

[0042] Tapered shank shaft 1, gear transmission assembly, driven shaft assembly 15, and cutting tool;

[0043] The aforementioned gear transmission assembly is sleeved on the tapered shank shaft 1; the driven shaft assembly 15 is sleeved on the gear transmission assembly; the gear transmission assembly includes a rear body 7, a gear set 9 and a front body 11; the gear set 9 includes a driving gear and multiple driven gears; the driven shaft assembly 15 includes multiple driven shafts 15, which are used to connect with the cutting tool;

[0044] The gear set 9 is disposed between the rear body 7 and the front body 11. Each driven gear in the gear set 9 is respectively connected to one of the multiple driven shafts 15, so that when the driving gear rotates, the driven gear drives the corresponding driven shaft 15 to rotate.

[0045] The multi-axis cutting tool for machining centers provided in this embodiment of the invention can support drilling and tapping of at least two holes simultaneously during deep hole machining, effectively saving a significant amount of cutting time and improving production efficiency. Moreover, the weight and dimensions of this multi-axis cutting tool meet the requirements of the machining center's tool head ATC quick tool change, supporting ATC quick tool change without reducing machining conditions, reducing machining cycle time, and solving the current machining bottleneck problem.

[0046] In one embodiment, the tapered shank 1 is connected to the drive gear, for example, via a flat key 2.

[0047] In practice, the driving gear and driven gear can be, for example, ground spur gears.

[0048] In one embodiment, a first sealing ring groove is provided on the front body 11 for installing the first sealing ring 10.

[0049] In one embodiment, the gear transmission assembly further includes a drive gear bearing assembly; the drive gear bearing assembly includes a bearing end cap 4, an angular contact ball bearing 8, and a deep groove ball bearing 6;

[0050] The rear body 7 has a first countersunk hole; the front body 11 has a first countersunk hole; a deep groove ball bearing 6 is provided on the outer side of the countersunk hole of the first rear body 7, and an angular contact ball bearing 8 is provided on the inner side; the first front body 11 has a deep groove ball bearing 6 in its countersunk hole.

[0051] The deep groove ball bearing 6 provided on the outer side of the countersunk hole of the first rear body 7, the angular contact ball bearing 8 provided on the inner side, and the deep groove ball bearing 6 provided in the countersunk hole of the first front body 11 are all sleeved on the tapered shank shaft 1.

[0052] The drive gear is connected to the tapered shank shaft 1 via a key and is positioned between the deep groove ball bearing 6 located on the outer side of the countersunk hole of the first rear body 7 and the deep groove ball bearing 6 located on the countersunk hole of the first front body 11.

[0053] In one embodiment, the aforementioned drive gear bearing assembly further includes a drive gear bearing assembly oil seal 5; the drive gear bearing assembly oil seal 5 is disposed inside the bearing end cover 4 and is used to seal the bearing, so that the lubricating oil inside each bearing is kept within the working area, ensuring that each bearing is well lubricated, reducing wear caused by insufficient lubricating oil, and improving the service life and working efficiency of each bearing.

[0054] In one embodiment, the gear transmission assembly further includes a plurality of driven gear bearing assemblies; each driven gear bearing assembly includes a pair of angular contact bearings and a pair of deep groove ball bearings 6;

[0055] The rear body 7 has multiple countersunk holes for the second rear body 7; the front body 11 has multiple countersunk holes for the second front body 11; the aforementioned pair of deep groove ball bearings 6 are disposed inside the corresponding countersunk holes for the second rear body 7; the aforementioned pair of angular contact ball bearings 8 are disposed inside the corresponding countersunk holes for the second front body 11.

[0056] Each driven gear is disposed between the pair of deep groove ball bearings 6 and the pair of angular contact ball bearings 8.

[0057] In one embodiment, the aforementioned gear set 9 is disposed within a housing formed by the front body 11 and the rear body 7 after they are closed, and there are support structures on both sides of the housing.

[0058] In one embodiment, the gear transmission assembly further includes a front cover 14; the front cover 14 is disposed on the front body 11;

[0059] The front cover 14 has multiple holes, and each driven shaft 15 passes through the corresponding hole on the front cover 14 and is engaged with a pair of angular contact ball bearings 8, a driven gear and a pair of deep groove ball bearings 6.

[0060] In one embodiment, a second sealing ring groove is provided on the front cover 14 for installing the second sealing ring 13.

[0061] In one embodiment, the front cover 14 has an oil sealing hole for installing the driven gear bearing assembly oil seal 12.

[0062] In one embodiment, when the driven shaft 15 is engaged with a pair of deep groove ball bearings 6, the end of the driven shaft 15 is limited by a lock nut 24.

[0063] In one embodiment, the driven shaft assembly 15 further includes a driven shaft 15 sleeve; the driven shaft 15 sleeve includes a spring sleeve 16 and a tool holder nut 17;

[0064] The tool holder nut 17 is sleeved with the spring collet 16; the tool holder nut 17 is connected to the driven shaft 15; the driven shaft 15 is connected to an external cutting tool through the spring collet 16.

[0065] In one embodiment, the gear transmission assembly further includes a stop mechanism; the stop mechanism includes a stop ring 3, a stop block 20, a positioning bolt 18, and a plunger spring;

[0066] The stop ring 3 is sleeved on the tapered shank shaft 1; the rear body 7 has a plunger hole and a positioning bolt 18 hole; the stop block 20 has a countersunk hole; the positioning bolt 18 passes through the through hole and the positioning bolt 18 hole of the stop block 20 and is fixedly connected to the rear body 7; the stop ring 3 has a groove on its ring surface, and one side of the stop block 20 has a boss that mates with the groove in the vertical axis; the plunger spring 22 is disposed in the plunger hole, and when the groove and the boss are engaged, the plunger spring 22 presses against the stop block 20 to limit the stop block 20.

[0067] In one embodiment, the rear body 7 and the stop block 20 are also connected by a first positioning pin 21.

[0068] In one embodiment, the gear transmission assembly further includes an oil-free bushing 19; the oil-free bushing 19 is disposed in the countersunk hole of the stop block 20.

[0069] In one embodiment, the rear body 7 is further provided with a set screw hole, and the positioning bolt 18 is fixedly connected to the rear body 7 through the set screw hole.

[0070] In practice, the positioning bolt 18 passes through the positioning bolt 18 hole provided with the oil-free bushing 19, and is fixed by the positioning bolt 18 through the set screw hole opened on the rear body 7.

[0071] In one embodiment, the front body 11 and the rear body 7 are fixed in relative position by a second positioning pin 23.

[0072] Reference Figure 2 The diagram shown is a schematic of the multi-axis tool assembly obtained after assembling the various components.

[0073] The following example illustrates the working process of the multi-axis tool for machining centers provided in this embodiment of the present invention.

[0074] In this example, gear set 9 includes two driven gears, and the front cover 14 has two holes, as shown in the reference. Figure 1 As shown, each driven shaft 15 passes through a hole in the front cover 14 and engages with one of the driven gears.

[0075] First, the multi-axis tool is installed on the tool head of the machining center. When drilling is required, the machine tool automatically changes the tool. The positioning block installed on the machine tool cooperates with the positioning bolt 18 of the tool and presses down the stop block 20 to unlock the stop ring 3, thereby fixing the tool body to the machine tool. When the machine tool spindle rotates and performs machining, the taper shank shaft 1 drives the gear set 9 to rotate, and the gear set 9 drives the driven shaft 15 to rotate. A drill bit or tap is installed on the spring collet 16 to achieve synchronous drilling or tapping of the two axes.

[0076] The tapered shank 11 has a keyway for mounting a flat key 2; the tapered shank 1 is also equipped with a retaining ring 3, an end cap 4, an oil seal, a deep groove ball bearing 6, an angular contact bearing, a gear, a deep groove ball bearing 6, and a lock nut 24; the oil seal is installed in the end cap 4; the aforementioned deep groove ball bearing 6 is installed in the countersunk hole of the rear body 7, and the end cap 4 is installed on the rear body 7 using M3 screws;

[0077] An oilless bushing 19 is installed in the countersunk hole of the stop block 20. A locating pin passes through the pin hole of the stop block 20 and is inserted into the locating pin hole of the rear body 7. A plunger spring 22 is installed in the plunger hole of the rear body 7. A locating bolt 18 passes through the locating pin to fix the relative position. The gear is located in the housing formed after the front and rear bodies 7 are closed, and it is a two-sided support structure. A first sealing ring groove is opened on the front body 11, and a first sealing ring 10 is installed in the groove. Two pairs of angular contact ball bearings 8 and a pair of deep groove ball bearings 6 are installed in the bearing holes of the front body 11. An oil seal hole and a second sealing ring groove are opened on the front body 11 for installing the oil seal 12 and the second sealing ring 13 of the driven gear bearing assembly. A keyway is opened on the driven shaft 15, which is connected to the driven gear by installing a flat key 2. A thread is opened at the end of the driven shaft 15, which is limited by threaded engagement with the lock nut 24. The inner conical surface of the head of the driven shaft 15 is used to install the tool holder, and the external thread is used to install the tool holder nut 17.

[0078] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A multi-axis cutting tool for a machining center, characterized in that, include: Tapered shank shaft, gear transmission assembly, driven shaft assembly, and cutting tool; The gear transmission assembly is sleeved on the tapered shank shaft; the driven shaft assembly is sleeved on the gear transmission assembly; the gear transmission assembly includes a rear body, a gear set, and a front body; the gear set includes a driving gear and multiple driven gears; the driven shaft assembly includes multiple driven shafts, which are used to connect to the cutting tool; The gear set is disposed between the rear main body and the front main body. Each driven gear in the gear set is respectively sleeved with one of the multiple driven shafts, so that when the driving gear rotates, the driven gear drives the corresponding driven shaft to rotate.

2. The multi-axis cutting tool for a machining center as described in claim 1, characterized in that, The gear transmission assembly also includes a drive gear bearing assembly. The drive gear bearing assembly includes a bearing end cap, an angular contact ball bearing, and a deep groove ball bearing; The rear main body has a first rear main body countersunk hole; the front main body has a first front main body countersunk hole; a deep groove ball bearing is provided on the outer side of the first rear main body countersunk hole, and an angular contact ball bearing is provided on the inner side; a deep groove ball bearing is provided in the first front main body countersunk hole. The deep groove ball bearing provided on the outer side of the first rear main body countersunk hole, the angular contact ball bearing provided on the inner side, and the deep groove ball bearing provided in the first front main body countersunk hole are all sleeved on the tapered shank shaft; The drive gear is connected to the tapered shank shaft via a key and is positioned between the deep groove ball bearing located on the outer side of the first rear main body countersunk hole and the deep groove ball bearing located on the first front main body countersunk hole.

3. The multi-axis cutting tool for a machining center as described in claim 1, characterized in that, The gear transmission assembly also includes multiple driven gear bearing assemblies; Each driven gear bearing assembly includes a pair of angular contact bearings and a pair of deep groove ball bearings; The rear main body has multiple second rear main body countersunk holes; the front main body has multiple second front main body countersunk holes; a pair of deep groove ball bearings are disposed inside the corresponding second rear main body countersunk holes; a pair of angular contact ball bearings are disposed inside the corresponding second front main body countersunk holes; Each driven gear is disposed between the pair of deep groove ball bearings and the pair of angular contact ball bearings.

4. The multi-axis cutting tool for a machining center as described in claim 3, characterized in that, The gear transmission assembly also includes a front cover; the front cover is disposed on the front body; The front cover has multiple holes, and each driven shaft passes through the corresponding hole on the front cover and is sleeved with the corresponding pair of angular contact ball bearings, driven gears and the pair of deep groove ball bearings.

5. The multi-axis cutting tool for a machining center as described in claim 4, characterized in that, When the driven shaft is engaged with the pair of deep groove ball bearings, the end of the driven shaft is limited by a lock nut.

6. The multi-axis cutting tool for a machining center as described in any one of claims 1-5, characterized in that, The driven shaft assembly further includes a driven shaft sleeve; the driven shaft sleeve includes a spring sleeve and a tool holder nut; The tool holder nut is sleeved with the spring collet; the tool holder nut is connected to the driven shaft; the driven shaft is connected to an external cutting tool through the spring collet.

7. The multi-axis cutting tool for a machining center as described in any one of claims 1-5, characterized in that, The gear transmission assembly further includes a stop mechanism; the stop mechanism includes a stop ring, a stop block, a positioning bolt, and a plunger spring; The stop ring is sleeved on the tapered shank shaft; The rear main body is provided with a plunger hole and a positioning bolt hole; the stop block is provided with a countersunk hole; The positioning bolt passes through the through hole of the stop block and the positioning bolt hole, and is fixedly connected to the rear body; a groove is provided on the ring surface of the stop ring, and one side of the stop block has a boss that mates with the groove in a vertical direction; the plunger spring is disposed in the plunger hole, and when the groove and the boss are engaged, the spring presses against the stop block to limit the stop block.

8. The multi-axis cutting tool for a machining center as described in claim 7, characterized in that, The rear body and the stop block are also connected by a first positioning pin.

9. The multi-axis cutting tool for a machining center as described in claim 7, characterized in that, The gear transmission assembly also includes an oil-free bushing; the oil-free bushing is disposed in the countersunk hole of the stop block.

10. The multi-axis cutting tool for a machining center as described in any one of claims 1-5, characterized in that, The front and rear bodies are fixed in relative positions by a second positioning pin.

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