Deep cavity milling device and numerical control milling machine

Abstract

The deep cavity milling device comprises a shell, a transmission assembly and a cutter clamping assembly, the transmission assembly is rotationally connected into the shell, the cutter clamping assembly is arranged on the side wall of the lower portion of the shell, and the cutter clamping assembly is meshed with the lower end of the transmission assembly. According to the utility model, the problems that a conventional cutter and a cutter handle cannot enter a specified position for processing because the position of the straight keyway has a larger interference characteristic when the straight keyway on the side wall of an existing deep cavity is milled are solved; the problems that only a super-long cutter can be used, the super-long cutter is prone to being broken, vibration can be generated, the machining size requirement cannot be met, a straight key groove root fillet cannot be removed, a slotting tool needs to be replaced, the slotting tool replacement procedure is complex, the repeated positioning accuracy in the vertical direction is poor and the like are solved, the manufacturing cost is saved, and the machining efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical processing equipment, and in particular relates to a deep cavity milling device and a numerically controlled milling machine. Background Art

[0002] When machining keyways on CNC milling machines, the cutter often moves in a circular motion, which makes it impossible to remove the rounded corners of the machined keyways, and ultimately makes it difficult to meet the characteristic requirements of right-angle keyways. Especially when machining straight keyways on the side walls of deep cavities, when the position of the straight keyways on the side walls of deep cavities is small from the radial distance and has large interference features, conventional cutters and toolholders cannot enter the specified position for machining, and it is necessary to customize extra-long cutters for machining. However, excessively long cutters will cause vibrations and cannot guarantee machining size requirements. After machining using only an extended milling cutter, the rounded corners at the root of the keyway still cannot be removed cleanly, and it can only be re-processed using an extra-long insert milling method. The structure of the original toolholder of the CNC milling machine makes it very easy for the extra-long cutter to break during keyway machining, which not only increases the machining cost, but also causes poor repeat positioning accuracy in the up and down directions when the cutter is replaced, making it impossible to guarantee machining accuracy and limiting the cutting range. Summary of the invention

[0003] The utility model aims to provide a deep cavity milling device and a CNC milling machine. The novel structure of the transmission component and the tool clamping component of the deep cavity milling device solves the problems that, when milling the straight keyway on the side wall of the existing deep cavity, the conventional tool and the tool holder cannot enter the designated position for processing because the straight keyway has large interference characteristics at the position where the straight keyway is located, and only an extra-long tool can be used, and the extra-long tool is easy to break, the tool is too long to generate vibration and cannot meet the processing size requirements, the fillet at the root of the straight keyway cannot be removed, and the insert tool needs to be replaced, but the insert tool replacement procedure is complicated and the repeated positioning accuracy in the upper and lower directions is poor, thereby saving manufacturing costs and improving processing efficiency.

[0004] The specific contents of the plan are as follows:

[0005] A deep cavity milling device comprises a shell, a transmission assembly, and a tool clamping assembly. The transmission assembly is rotatably connected in the shell, and a tool clamping assembly is provided on the side wall of the lower part of the shell. The tool clamping assembly is meshed with the lower end of the transmission assembly. The transmission assembly comprises a bevel gear, a tool handle, a transmission shaft, a first limit bearing and a first bearing cover. The tool handle is rotatably limited and connected in the opening of the shell, the top end of the transmission shaft is clamped and fixed with the tool handle, the lower end of the transmission shaft is sleeved in the bevel gear, and the end of the transmission shaft is sleeved in the first bearing cover and the first limit bearing. The first bearing cover is fixedly connected to the upper surface of the outer edge of the first positioning groove on the inner bottom wall of the shell, the first bearing cover is crimped on the first limit bearing, and the first limit bearing is limited and fixed in the first positioning groove.

[0006] The transmission assembly and the tool clamping assembly of the deep cavity milling device are connected and transmitted through bevel gears. The tool clamping assembly is arranged at the lower part of the housing. When processing the straight keyway of the side wall of the deep cavity, the tool clamping assembly enters the deep cavity with the transmission assembly to mill the straight keyway of the side wall, without the need to use an extra-long tool. The tool handle is a conventional tool handle, which is arranged in the opening of the housing and is rotatably connected to the spindle of the CNC milling machine. When the spindle rotates, the tool handle clamps the transmission shaft to rotate. The lower end of the transmission shaft is sleeved on the bevel gear, and the end of the transmission shaft is sleeved on the first bearing cover and the first limit bearing in sequence. The first limit bearing is arranged in the first positioning groove, and the first bearing cover is fixedly connected to the upper surface of the outer edge of the first positioning groove and the first bearing cover is pressed on the first limit bearing. The first limit bearing is fixed in the first positioning groove.

[0007] Furthermore, the shell is a cylinder with an opening at the top, a side positioning hole is provided on the outer wall of the upper part of the shell, a first positioning groove is provided at the center position of the inner bottom wall of the shell, a through hole is provided on the side wall of the lower part of the shell and a second positioning groove is provided on the outer edge circumference of the through hole.

[0008] The top of the shell is provided with an opening, and a conventional tool handle is rotatably connected in the opening. The outer side wall of the upper part of the shell is provided with a side positioning hole for connecting with the lower end surface of the spindle jacket of the CNC milling machine. A first positioning groove is provided at the center position of the inner bottom wall of the shell, and the end of the transmission shaft is sequentially sleeved in the first limit bearing and the first bearing cover. The first limit bearing is arranged in the first positioning groove, and the first bearing cover is pressed and fixedly connected to the surface around the outer edge of the first positioning groove and the first bearing cover is pressed on the first limit bearing. The first limit bearing is limited and fixed in the first positioning groove, which solves the problem that the transmission shaft will vibrate and affect the processing accuracy when it is too long. A through hole is provided on the lower side wall of the shell, and one end of the tool clamping handle is connected to the driven gear, and the other end passes through the through hole. The tool clamping handle is sequentially sleeved in the second limit bearing and the second bearing cover. A second positioning groove is arranged on the outer circumference of the through hole, a second limiting bearing is arranged in the second positioning groove, a second bearing cover is fixedly connected to the outer side surface of the second positioning groove and the second bearing cover is pressed on the second limiting bearing, and the second limiting bearing is limited and fixed in the second positioning groove, so that the rotation of the driven gear is more stable, and the tool clamped by the tool clamping handle will not vibrate, thereby meeting the processing requirements.

[0009] Furthermore, the transmission shaft includes a first transmission shaft and a second transmission shaft, the end of the first transmission shaft is threadedly connected to the top of the second transmission shaft, the bevel gear includes a base gear and a driven gear, the base gear is connected to the second transmission shaft, a cam is provided in the middle of the second transmission shaft, four first cams are provided on the circumferential side of the cam, the large end of the base gear is provided with a mounting groove matching the cam, the base gear is sleeved on the second transmission shaft and fixed with the cam of the second transmission shaft, four second cams are provided on the circumferential side of the end of the second transmission shaft, a cam hole matching and sleeved with the second cam is provided at the center of the first bearing cover, and a keyway matching the second cam is provided at the center position of the first limit bearing.

[0010] The tool handle is connected to the main shaft of the CNC milling machine in a conical shape, and drives the transmission shaft to rotate with the main shaft when the main shaft rotates. The bevel gear includes a base gear and a driven gear, and the second transmission shaft is sleeved on the base gear. The lower end of the transmission shaft is connected to the base gear, and the base gear adopts a helical gear method to transmit speed with the driven gear, which has stability and reliability. A cam is provided in the middle of the second transmission shaft, and four first convex keys are provided on the cam. A mounting groove matching the cam is provided at the large end of the base gear, and the cam of the second transmission shaft is limited and fixed in the mounting groove. Four second convex keys are provided on the side surface of the end of the second transmission shaft, and a convex key hole through which the second convex key can pass is provided at the center position of the first bearing cover, and the end of the second transmission shaft passes through the center position of the first bearing cover and is sleeved in the first bearing cover. A keyway matching the second convex key is provided at the center position of the second limit bearing, and the end of the second transmission shaft penetrates into the center position of the first limit bearing and is sleeved in the first limit bearing, and the second convex key is engaged with the keyway of the first limit bearing. The first limit bearing is arranged in the first positioning groove, the first bearing cover is pressed on the first limit bearing, and the first bearing cover is fixedly connected to the surface of the outer edge of the first positioning groove, and the second limit bearing is limited and fixed in the first positioning groove, which solves the problem that the transmission shaft is too long and easy to swing, and makes the base gear of the bevel gear rotate more smoothly.

[0011] Furthermore, the tool clamping assembly includes a tool clamping handle, a clamping cap, a second limit bearing, a second bearing cover and a tool. The closed end of the tool clamping handle is connected to the driven gear, the clamping hole end of the tool clamping handle is exposed outside the through hole at the lower part of the shell and the outer wall of the tool clamping handle is provided with a thread, the inner wall of the clamping cap is provided with a thread and is threadedly connected to the tool clamping handle, and the outer wall of the clamping cap is evenly provided with multiple grooves in the circumferential direction, and the tool is clamped and fixed in the clamping hole of the tool clamping handle.

[0012] Furthermore, the second limit bearing and the second bearing cover are sequentially sleeved on the tool clamping handle, the second bearing cover is fixedly connected to the outer surface of the second positioning groove, the second bearing cover is crimped on the second limit bearing, and the second limit bearing is limit-fixed in the second positioning groove.

[0013] The closed end of the tool clamping handle is connected to the driven gear, and the tool is clamped in the clamping hole of the tool clamping handle and exposed outside the through hole. The tool rotates by transmitting the rotation and speed of the main shaft through the driven gear to achieve milling of the workpiece. The tool clamping handle is sleeved in the second limit bearing and the second bearing cover in sequence. The second limit bearing is set in the second positioning groove. The second bearing cover is pressed on the second limit bearing and the second bearing cover is fixedly connected to the upper surface of the outer edge of the second positioning groove. The second limit bearing is limited and fixed in the second positioning groove. The driven gear rotates more smoothly and the tool clamping handle will not vibrate. There are multiple grooves on the outer wall of the clamping cap, and the grooves can be driven by a wrench to lock the clamping cap on the tool clamping handle. After the clamping cap is locked, it is pressed on the second bearing cover.

[0014] Furthermore, a straight-shaped positioning key is convexly provided on the inner side of the cavity of the tool clamping handle and is inserted into the tool positioning groove provided on the tool installation surface.

[0015] In order to remove the fillet at the root of the keyway, it is necessary to replace the insert cutter for insert milling. The process of adjusting the insert cutter angle when replacing the insert cutter is very complicated, and it will cause the problem of poor repeat positioning accuracy of the tool in the vertical direction. A straight-line positioning key is provided on the inner side of the cavity of the tool clamping handle. The straight-line positioning key is inserted into the tool positioning groove set on the tool installation surface, which can be used to quickly position and load the tool, help prevent the tool from loosening, and play a role in positioning and limiting the tool.

[0016] Furthermore, the tool is a milling cutter or a plunger.

[0017] When machining the straight keyway on the side wall of a deep cavity, the milling cutter moves in a circular motion, so there will be a rounded corner at the root of the keyway that cannot be removed. To remove the rounded corner at the root, you need to replace the tool and use a plunge cutter for plunge milling. So when machining, use the milling cutter first, then the plunge cutter. You can also replace it with other tools such as drills and reamer to meet machining needs.

[0018] Furthermore, the opening of the shell is provided with a stepped hole, and the diameter of the upper end of the opening is larger than the diameter of the handle.

[0019] A stepped hole is provided at the opening of the shell, the tool handle is rotatably connected in the opening of the shell, the tool handle is conically connected in the handle hole of the CNC machine tool, and the diameter of the upper end of the opening is larger than the diameter of the tool handle, so that the tool handle will not interfere with the shell when it rotates with the spindle in the opening.

[0020] A CNC milling machine comprises the deep cavity milling device, wherein the shell of the deep cavity milling device is threadedly fixedly connected to the lower end surface of the spindle sleeve of the CNC milling machine through a side fixing block, and the tool handle is conically connected to the handle hole of the CNC milling machine.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] 1. The utility model connects the transmission assembly and the tool clamping assembly through bevel gears, changes the transmission direction, and sets the tool clamping assembly at 90 degrees to the transmission shaft. When processing the straight keyway on the side of the deep cavity, the tool clamping assembly goes deep into the deep cavity with the housing, and the tool is rotated and milled through the bevel gear transmission to complete the processing, and there is no need to use an extra-long tool. The bottom of the housing adopts a bearing limiter, which not only limits the transmission shaft but also solves the problem of the transmission shaft being too long and easy to swing, making the rotation of the bevel gear more stable, and completely avoiding the situation where the original use of an extra-long tool causes vibration and affects the processing accuracy. When the spindle of the CNC milling machine is milling, the transmission shaft is stationary and can also increase the support force for the housing.

[0023] 2. When machining keyways on CNC milling machines, the tool often moves in a circular motion, which makes it impossible to remove the rounded corners of the machined keyways. Therefore, the tool needs to be replaced during machining, but the existing tool clamping structure makes the tool replacement procedure very complicated and causes the tool to have poor vertical repeat positioning accuracy. The design of the one-way positioning key and locking structure of the tool clamping assembly of the utility model makes tool replacement simple and fast, ensures machining accuracy, and the cutting range is no longer limited. The angle required by the tool tip can also be preset according to machining requirements, saving manufacturing costs and improving production efficiency.

[0024] 3. When the milling cutter is replaced with a plunge cutter during plunge milling, there is a certain height difference between the lowest point of the plunge cutter and the lowest point of the shell, which can avoid the interference features in the deep cavity, facilitate cutting, and avoid the problem of being unable to complete the processing due to the influence of interference features. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the utility model;

[0026] Figure 2 This is a schematic diagram of the housing structure of the utility model;

[0027] Figure 3 This is a schematic diagram of the structure of the tool clamping assembly of the utility model;

[0028] Figure 4 It is a structural schematic diagram of the driven gear of the utility model;

[0029] Figure 5 It is a schematic diagram of the position of the one-line positioning key of the tool clamping handle of the utility model;

[0030] Figure 6 It is a schematic diagram of the position of the positioning groove of the tool of the utility model;

[0031] Figure 7 It is an exploded view of the utility model;

[0032] Figure 8 This is a schematic diagram of a workpiece processed by the utility model.

[0033] In the figure: 1. housing; 1-1. opening; 1-1-1. step hole; 1-2. lateral positioning hole; 1-3. first positioning groove; 1-4. through hole; 1-5. second positioning groove; 2. transmission assembly; 2-1. bevel gear; 2-1-1. base gear; 2-1-1-1. mounting groove; 2-1-2. driven gear; 2-2. tool handle; 2-3. transmission shaft; 2-3-1. first transmission shaft; 2-3-2. second transmission shaft; 2-3-2-1. cam; 2-3-2-2. first convex key; 2-3-2-3. second convex key; 2-4. The first limit bearing; 2-5. The first bearing cover; 3. The tool clamping assembly; 3-1. The tool clamping handle; 3-1-1. The one-shaped positioning key; 3-2. The clamping cap; 3-3. The second limit bearing; 3-4 The second bearing cover; 3-5. The tool; 3-5-1. The tool positioning groove; 4. The side fixing block; 4-1. The first threaded mounting hole; 4-1-1. The first mounting bolt; 4-2. The second threaded mounting hole; 4-2-1. The second mounting bolt; 5. The spindle housing of the CNC milling machine; 5-1. The threaded mounting hole on the lower end face of the spindle housing. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0036] It should be noted that the directions or positional relationships indicated by the terms "front", "rear", "inside" and "outside" in the present invention are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0037] It should be particularly noted that any symbols and / or numbers in the specification that are not marked in the accompanying drawings are not drawing marks.

[0038] The embodiment provided by the utility model, that is, an embodiment of a deep cavity milling device and a CNC milling machine, is described below in combination with Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 Provide detailed explanation.

[0039] Embodiment 1:

[0040] A deep cavity milling device, see Figure 1 As shown, it includes a shell 1, a transmission assembly 2, and a tool clamping assembly 3. The transmission assembly 2 is rotatably connected inside the shell 1, and the tool clamping assembly 3 is provided on the side wall of the lower part of the shell 1. The tool clamping assembly 3 is engaged with the lower end of the transmission assembly 2.

[0041] See Figure 2 As shown, the shell 1 is a cylinder with an opening 1-1 on the top, a side positioning hole 1-2 is provided on the outer side wall of the upper part of the shell 1, a first positioning groove 1-3 is provided at the center position of the inner bottom wall of the shell 1, a through hole 1-4 is provided on the side wall of the lower part of the shell 1 and a second positioning groove 1-5 is provided on the outer edge circumference of the through hole 1-4.

[0042] See Figure 3 As shown, the transmission assembly 2 includes a bevel gear 2-1, a tool handle 2-2, a transmission shaft 2-3, a first limit bearing 2-4 and a first bearing cover 2-5. The tool handle 2-2 is rotationally limited and connected in the opening 1-1 of the shell 1. The top end of the transmission shaft 2-3 is clamped and fixed with the tool handle 2-2. The lower end of the transmission shaft 2-3 is sleeved in the bevel gear 2-1. The end of the transmission shaft 2-3 is sleeved in the first bearing cover 2-5 and the first limit bearing 2-4. The first bearing cover 2-5 is fixedly connected to the upper surface of the outer edge of the first positioning groove 1-3 on the inner bottom wall of the shell 1. The first bearing cover 2-5 is crimped on the first limit bearing 2-4. The first limit bearing 2-4 is limited and fixed in the first positioning groove 1-3.

[0043] The transmission shaft 2-3 includes a first transmission shaft 2-3-1 and a second transmission shaft 2-3-2. The end of the first transmission shaft 2-3-1 is threadedly connected to the top of the second transmission shaft 2-3-2. The bevel gear 2-1 includes a base gear 2-1-1 and a driven gear 2-1-2. The base gear 2-1-1 is connected to the second transmission shaft 2-3-2. A cam 2-3-2-1 is provided in the middle of the second transmission shaft 2-3-2. Four first convex keys 2-3-2-2 are provided on the circumferential side of the cam 2-3-2-1. Figure 4As shown, the large end of the base gear 2-1-1 is provided with a mounting groove 2-1-1-1 which matches the cam 2-3-2-1, the base gear 2-1-1 is sleeved on the second transmission shaft 2-3-2 and fixed with the cam 2-3-2-1 of the second transmission shaft 2-3-2, four second cams 2-3-2-3 are provided on the circumferential side of the end of the second transmission shaft 2-3-2, the center of the first bearing cover 2-5 is provided with a cam hole which matches and sleeves with the second cam, and the center position of the first limiting bearing 2-4 is provided with a keyway which matches the second cam 2-3-2-3.

[0044] The tool clamping assembly 3 includes a tool clamping handle 3-1, a clamping cap 3-2, a second limit bearing 3-3, a second bearing cover 3-4 and a tool 3-5. The closed end of the tool clamping handle 3-1 is connected to the driven gear 2-1-2. The clamping hole end of the tool clamping handle 3-1 is exposed outside the through hole 1-4 at the lower part of the shell 1 and the outer wall of the tool clamping handle 3-1 is provided with a thread. The inner wall of the clamping cap 3-2 is provided with a thread and is threadedly connected to the tool clamping handle 3-1. The outer wall of the clamping cap 3-2 is evenly provided with multiple grooves in the circumferential direction. The tool 3-5 is clamped and fixed in the clamping hole of the tool clamping handle 3-1.

[0045] The second limit bearing 3-3 and the second bearing cover 3-4 are sequentially sleeved on the tool clamping handle 3-1, the second bearing cover 3-4 is fixedly connected to the outer surface of the second positioning groove 1-5, the second bearing cover 3-4 is crimped on the second limit bearing 3-3, and the second limit bearing 3-3 is limit-fixed in the second positioning groove 1-5.

[0046] See Figure 5 , Figure 6 As shown, a straight-line positioning key 3-1-1 is convexly provided on the inner side of the cavity of the tool clamping handle 3-1 and is inserted into a tool positioning groove 3-5-1 provided on the tool installation surface.

[0047] Tools 3-5 are milling cutters or plungers.

[0048] The opening 1-1 of the housing 1 is provided with a stepped hole 1-1-1, and the diameter of the upper end of the opening 1-1 is larger than the diameter of the handle 2-2.

[0049] Embodiment 2:

[0050] The utility model also provides a CNC milling machine. Figure 1 , Figure 7 , Figure 8 As shown, the deep cavity milling device includes a housing 1 and a lower end surface threadedly fixedly connected to a spindle sleeve 5 of a CNC milling machine through a side fixing block 4, and a tool handle 2-2 is conically connected to a handle hole of the CNC milling machine.

[0051] The deep cavity milling device is installed on the lower end surface of the spindle sleeve 5 of the CNC milling machine. The side fixing block 4 is provided with a first threaded mounting hole 4-1 and a second threaded mounting hole 4-2. The first mounting bolt 4-1-1 penetrates into the first threaded mounting hole 4-1 and is threadedly connected with the side positioning hole 1-2 of the housing 1. The second mounting bolt 4-2-1 penetrates into the second threaded mounting hole 4-2 and is threadedly connected with the threaded mounting hole 5-1 on the lower end surface of the spindle sleeve 5 of the CNC milling machine. The tool handle 2-2 passes through the opening 1-1 of the housing 1 and is connected to the handle hole of the CNC milling machine in a conical connection manner.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A deep cavity milling device, characterized in that: The invention comprises a housing (1), a transmission assembly (2), and a tool clamping assembly (3); the housing (1) is rotatably connected with the transmission assembly (2); a side wall at the lower part of the housing (1) is provided with the tool clamping assembly (3); the tool clamping assembly (3) is meshed with the lower end of the transmission assembly (2); the transmission assembly (2) comprises a bevel gear (2-1), a tool handle (2-2), a transmission shaft (2-3), a first limit bearing (2-4), and a first bearing cover (2-5); the tool handle (2-2) is rotatably connected with the opening (1-1) of the housing (1); the transmission shaft The top end of the transmission shaft (2-3) is clamped and fixed with the knife handle (2-2), the lower end of the transmission shaft (2-3) is sleeved in the bevel gear (2-1), the end of the transmission shaft (2-3) is sleeved in the first bearing cover (2-5) and the first limit bearing (2-4), the first bearing cover (2-5) is fixedly connected to the upper surface of the outer edge of the first positioning groove (1-3) on the inner bottom wall of the housing (1), the first bearing cover (2-5) is pressed on the first limit bearing (2-4), and the first limit bearing (2-4) is fixed in the first positioning groove (1-3).

2. The deep cavity milling device according to claim 1, characterized in that: The shell (1) is a cylinder with an opening (1-1) at the top, a side positioning hole (1-2) is provided on the outer side wall of the upper part of the shell (1), a first positioning groove (1-3) is provided at the center of the inner bottom wall of the shell (1), a through hole (1-4) is provided on the side wall of the lower part of the shell (1), and a second positioning groove (1-5) is provided on the outer circumference of the through hole (1-4).

3. The deep cavity milling device according to claim 2, characterized in that: The transmission shaft (2-3) comprises a first transmission shaft (2-3-1) and a second transmission shaft (2-3-2), the end of the first transmission shaft (2-3-1) is threadedly connected to the top of the second transmission shaft (2-3-2), the bevel gear (2-1) comprises a base gear (2-1-1) and a driven gear (2-1-2), the base gear (2-1-1) is connected to the second transmission shaft (2-3-2), a cam (2-3-2-1) is provided in the middle of the second transmission shaft (2-3-2), four first convex keys (2-3-2-2) are provided on the circumference of the cam (2-3-2-1), the base gear (2-1-1) is connected to the second transmission shaft (2-3-2), and the base gear (2-1-2) is connected to the second transmission shaft (2-3-2). The large end of the first bearing cover (2-5) is provided with a mounting groove (2-1-1-1) matching the cam (2-3-2-1), the base gear (2-1-1) is sleeved on the second transmission shaft (2-3-2) and is fixed with the cam (2-3-2-1) of the second transmission shaft (2-3-2), four second convex keys (2-3-2-3) are provided on the circumferential side of the end of the second transmission shaft (2-3-2), a convex key hole matching the second convex key (2-3-2-3) is provided at the center of the first bearing cover (2-5), and a keyway matching the second convex key (2-3-2-3) is provided at the center of the first limiting bearing (2-4).

4. The deep cavity milling device according to claim 3, characterized in that: The tool clamping assembly (3) comprises a tool clamping handle (3-1), a clamping cap (3-2), a second limit bearing (3-3), a second bearing cover (3-4) and a tool (3-5); the closed end of the tool clamping handle (3-1) is connected to the driven gear (2-1-2); the clamping hole end of the tool clamping handle (3-1) is exposed outside the through hole (1-4) at the lower part of the housing (1); the outer wall of the tool clamping handle (3-1) is provided with a thread; the inner wall of the clamping cap (3-2) is provided with a thread and is threadedly connected to the tool clamping handle (3-1); the outer wall of the clamping cap (3-2) is evenly provided with a plurality of grooves in the circumferential direction; the tool (3-5) is clamped and fixed in the clamping hole of the tool clamping handle (3-1).

5. The deep cavity milling device according to claim 4, characterized in that: The second limit bearing (3-3) and the second bearing cover (3-4) are sleeved on the tool clamping handle (3-1) in sequence, the second bearing cover (3-4) is fixedly connected to the outer side surface of the second positioning groove (1-5), the second bearing cover (3-4) is pressed onto the second limit bearing (3-3), and the second limit bearing (3-3) is limit-fixed in the second positioning groove (1-5).

6. The deep cavity milling device according to claim 5, characterized in that: A straight-line positioning key (3-1-1) is convexly provided on the inner side of the cavity of the tool clamping handle (3-1) and is inserted into a tool positioning groove (3-5-1) provided on the tool installation surface.

7. The deep cavity milling device according to claim 6, characterized in that: The tool (3-5) is a milling cutter or a plunger.

8. The deep cavity milling device according to claim 7, characterized in that: The opening (1-1) of the housing (1) is provided with a stepped hole (1-1-1), and the diameter of the upper end of the opening (1-1) is greater than the diameter of the knife handle (2-2).

9. A CNC milling machine, characterized in that: It comprises a deep cavity milling device as described in any one of claims 1 to 8, wherein the shell (1) is threadedly fixedly connected to the lower end surface of the spindle sleeve (5) of the CNC milling machine through a side fixing block (4), and the tool handle (2-2) is conically connected to the handle hole of the CNC milling machine.

Images