A large-diameter boring tool crown combination structure of a numerical control boring and milling machine
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-30
- Publication Date
- 2026-08-11
AI Technical Summary
[0005]为了克服背景技术中的不足，本实用新型公开了一种数控镗铣床大直径镗孔刀冠组合结构，解决铝合金轧制设备零件大直径深孔加工存在的加工效率低、成本高的问题，以提高企业的经济效益
[0014]由于采用如上所述的技术方案，本实用新型具有如下有益效果：本实用新型公开的一种数控镗铣床大直径镗孔刀冠组合结构，包括刀冠本体、金属切削刀具、刀柄；刀冠本体一侧面两端各设有一条刀具安装槽，两条刀具安装槽之间设有贯穿的刀冠定位孔，刀冠定位孔两端面均设有刀冠键槽和贯穿的刀冠固定孔；数控镗铣床大直径镗孔刀冠工作时，两条刀具安装槽中均固定设置一把金属切削刀具，刀柄则通过刀冠定位孔、刀冠键槽固定设置在与刀具安装槽相同的侧面，刀柄与主轴通过锥面配合连接传递扭矩，通过拉紧螺栓防止刀柄与主轴之间产生松脱；在进行大直径深孔加工时，大直径镗孔刀冠组合以两把刀具对称吃刀、以主轴拉动大直径镗孔刀冠组合的方式沿主轴轴线方向反向进给，使主轴在大直径深孔加工过程中受拉应力，因此在金属切削刀具吃刀量和进给量均较大的情况下，主轴也不容易发生振动，从而大幅提高了大直径深孔的加工效率和表面质量；另外，刀冠本体上设置的刀具调整螺栓，可以在大直径深孔加工多个粗加工、精加工工序之间，无需从主轴上拆下镗孔刀冠组合即可对刀具装卡位置进行调整，因此大幅缩短了镗孔刀冠组合的调整时间；另外，上述以主轴拉动大直径镗孔刀冠组合沿主轴轴线方向反向进给加工方式，还解决了某些情况下零件结构与数控镗铣床主轴箱干涉问题，因此无需再将零件大直径深孔加工外包，使得零件加工及运输成本也得以大幅降低，从而使企业经济效益得以提高。
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Abstract
Description
Technical Field
[0001] This utility model relates to the field of CNC boring and milling machine tool technology, specifically to a large-diameter boring tool crown combination structure for CNC boring and milling machines. Background Technology
[0002] In aluminum alloy rolling mill production, it is common to encounter the machining of holes in large-sized, structurally unique, and irregularly shaped parts, such as the pressing holes in hot-rolled arches and the holes in large gearboxes. Due to the large size of these parts, CNC boring and milling machines are typically chosen for hole machining. The main challenge in machining large-diameter deep holes is balancing the rigidity of the long-overhanging spindle with machining efficiency and quality, which places high demands on both machine tool performance and operator skills. To improve production efficiency, reduce production costs, and ensure the machining quality of parts, a rectangular block-shaped boring cutter head for large-diameter deep holes has been designed. Typically, metal cutting tools are fixedly mounted at both ends or one end of the boring cutter head, and the middle of the boring cutter head is fixedly connected to the tool holder. The boring cutter head is mounted on the front end of the CNC boring and milling machine spindle via the tool holder. The spindle drives the boring cutter head to rotate and pushes it forward along the spindle axis to complete the cutting of the large-diameter deep hole.
[0003] The problems with the aforementioned boring tool assembly for machining large-diameter deep holes are as follows: 1. During the machining process, the large-diameter boring tool assembly is fed forward along the spindle axis by the spindle. The spindle is under compressive stress. When the depth of cut or feed rate of the metal cutting tool is large, the spindle is prone to vibration. Therefore, it is necessary to reduce the depth of cut and feed rate, which seriously affects the machining efficiency and surface quality of large-diameter deep holes; 2. Machining large-diameter deep holes requires multiple roughing and finishing operations. After each operation is completed, the boring tool assembly must be removed from the spindle. The mounting position of the metal cutting tools on the boring tool head assembly is adjusted using a special tool setting fixture to ensure the diameter of the hole after the next process. Therefore, the work of adjusting the tool position of the boring tool head before each process is large, complicated and time-consuming, which also seriously affects the processing efficiency. 3. In some cases, due to the limitation of the maximum feed depth of the CNC boring and milling machine spindle, the part structure and the spindle box of the CNC boring and milling machine will interfere, making it impossible to complete the processing of large-diameter deep holes. Therefore, the processing of the parts has to be outsourced, resulting in high processing and transportation costs.
[0004] Due to the aforementioned problems, the processing cost of aluminum alloy rolling equipment remains high, seriously affecting the economic benefits of enterprises. Utility Model Content
[0005] In order to overcome the shortcomings of the prior art, this utility model discloses a combination structure of large-diameter boring cutter crown for CNC boring and milling machine, which solves the problems of low processing efficiency and high cost in the processing of large-diameter deep holes in aluminum alloy rolling equipment parts, so as to improve the economic benefits of enterprises.
[0006] To achieve the aforementioned utility model objective, the present utility model adopts the following technical solution: a large-diameter boring tool crown assembly structure for a CNC boring and milling machine, the boring tool crown assembly comprising a tool crown body, a metal cutting tool, and a tool holder; a tool mounting groove is provided at each end of one side of the tool crown body, a through tool crown positioning hole is provided between the two tool mounting grooves, a tool crown keyway is provided on both ends of the tool crown positioning hole, and through tool crown fixing holes are evenly distributed around the tool crown positioning hole; when the large-diameter boring tool crown of the CNC boring and milling machine is working, the metal cutting tool is fixedly installed in one or two tool mounting grooves, and the tool holder is fixedly installed on the same side as the tool mounting groove or on the opposite side of the tool mounting groove through the tool crown positioning hole and the tool crown keyway.
[0007] Furthermore, the two tool mounting slots have a height difference.
[0008] Preferably, the two tool mounting slots have the same depth.
[0009] Furthermore, countersunk holes are provided at both ends of the blade fixing hole.
[0010] Furthermore, on one of the two opposite sides of the tool mounting slot, there is a tool fixing bolt hole.
[0011] Preferably, tool fixing bolt holes are provided on both opposite sides of the tool mounting slot.
[0012] Furthermore, a tool mounting slot bottom plate is provided on the inner side of the tool mounting slot, and an adjusting bolt baffle is fixedly provided on the outer side of the tool mounting slot bottom plate; the tool mounting slot bottom plate and the adjusting bolt baffle are provided with through holes; a tool adjusting bolt is provided in the through hole of the tool mounting slot bottom plate, and the bolt head of the tool adjusting bolt is located between the tool mounting slot bottom plate and the adjusting bolt baffle.
[0013] Furthermore, the metal cutting tool includes a cutting head and a cutting body, with an adjusting bolt hole on the end face of the cutting body; the tool adjusting bolt engages with the adjusting bolt hole on the end face of the cutting body.
[0014] Due to the adoption of the above-described technical solution, this utility model has the following beneficial effects: This utility model discloses a large-diameter boring tool crown assembly structure for a CNC boring and milling machine, comprising a tool crown body, a metal cutting tool, and a tool holder; each end of one side of the tool crown body is provided with a tool mounting groove, and a through tool crown positioning hole is provided between the two tool mounting grooves; both ends of the tool crown positioning hole are provided with a tool crown keyway and a through tool crown fixing hole; when the large-diameter boring tool crown of the CNC boring and milling machine is working, a metal cutting tool is fixedly installed in each of the two tool mounting grooves, and the tool holder is fixedly installed on the same side as the tool mounting groove through the tool crown positioning hole and the tool crown keyway; the tool holder and the spindle are connected by a tapered surface to transmit torque, and a tightening bolt is used to prevent the tool holder from loosening from the spindle; when machining large-diameter deep holes, the large-diameter boring tool crown assembly uses two tools to symmetrically cut the material, and the spindle pulls the large-diameter boring tool crown assembly. The reverse feed along the spindle axis subjects the spindle to tensile stress during the machining of large-diameter deep holes. Therefore, even with large depths of cut and feed rates of metal cutting tools, the spindle is less prone to vibration, significantly improving the machining efficiency and surface quality of large-diameter deep holes. Furthermore, the tool adjustment bolts on the tool holder body allow for tool adjustment between multiple roughing and finishing operations in large-diameter deep hole machining without removing the boring tool holder assembly from the spindle, thus greatly reducing the adjustment time. Additionally, this reverse feed method, where the spindle pulls the large-diameter boring tool holder assembly along the spindle axis, also solves the problem of interference between the part structure and the CNC boring and milling machine spindle box in certain situations. Therefore, there is no need to outsource the machining of large-diameter deep holes, significantly reducing part processing and transportation costs and improving the company's economic benefits. Attached Figure Description
[0015] Figure 1 A schematic diagram of the usage status of the large-diameter boring tool crown on an existing CNC boring and milling machine. Figure 1 ; Figure 2 A schematic diagram of the usage status of the large-diameter boring tool crown on an existing CNC boring and milling machine. Figure 2 ; Figure 3 Visual inspection of existing boring tool crowns Figure 1 ; Figure 4 Visual inspection of existing boring tool crowns Figure 2 ; Figure 5 This is a schematic diagram showing the interference between the part structure and the spindle box of the CNC boring and milling machine during forward feed. Figure 6 Schematic diagram of the use of the large-diameter boring tool crown combination on a CNC boring and milling machine. Figure 1 ; Figure 7 Schematic diagram of the use of the large-diameter boring tool crown combination on a CNC boring and milling machine. Figure 2 ; Figure 8 An exploded view of the large-diameter boring tool crown assembly structure of a CNC boring and milling machine; Figure 9 Illustration of the appearance of the blade crown. Figure 1 ; Figure 10 Illustration of the appearance of the blade crown. Figure 2 ; Figure 11 A schematic diagram of the appearance of a metal cutting tool; Figure 12 A schematic diagram illustrating the interference between the part structure and the spindle box of the CNC boring and milling machine in the case of reverse feed.
[0016] In the diagram: 1. Boring tool assembly; 1.1 Tool body; 1.2 Tool positioning hole; 1.3 Tool mounting slot A; 1.4 Tool mounting slot B; 1.5 Tool keyway; 1.6 Tool mounting slot base plate; 1.7 Tool fixing bolt hole; 1.8 Tool fixing hole; 2. Metal cutting tool; 2.1 Tool head; 2.2 Tool body; 2.3 Adjusting bolt hole; 4. Tool holder; 5. Tool adjusting bolt; 6. Adjusting bolt baffle; 7. Flat key; 10. Part to be machined; 10.1 Boss; 10.2 Deep hole; 10.3 Deep hole step surface. Detailed Implementation
[0017] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.
[0018] See the instruction manual appendix Figure 1 , 2 The diagram shows the usage status of a large-diameter boring tool assembly on an existing CNC boring and milling machine. The boring tool assembly 1 includes a tool head body 1.1, a metal cutting tool 2, and a tool holder 4. The metal cutting tool 2 is mounted on one side of the tool head body 1.1, and the tool holder 4 is fixedly mounted on the other side of the tool head body 1.1. The boring tool assembly 1 is mounted on the front end of the spindle (the spindle is not shown in the diagram) through a tapered fit between the tool holder 4 and the spindle. The working mode of the existing boring tool assembly 1 is as follows: the spindle pushes the boring tool assembly 1 to feed forward along the spindle axis, and the spindle is subjected to compressive stress. The working principle of the existing boring tool assembly 1 is determined by the structure of the tool body 1.1, see the attached manual. Figure 3 , 4The diagram shows the structure of the existing cutter head body 1.1: The cutter head body 1.1 is a rectangular strip, with tool mounting slots A1.3 and B1.4 at both ends of one side for mounting metal cutting tools 2. Tool fixing bolt holes 1.7 are provided on one side of tool mounting slots A1.3 and B1.4 (tool fixing bolts are installed in holes 1.7 to mount the metal cutting tools 2); a through-hole cutter head positioning hole 1.2 is provided between tool mounting slots A1.3 and B1.4 for connecting the tool holder 4 to the cutter head body 1.1. For positioning, the tool holder 4 is fixedly connected to the tool holder body 1.1 by a bolt through the evenly distributed through-hole tool holder fixing holes 1.8 around the tool holder positioning hole 1.2. The tool holder body 1.1 has tool mounting grooves A1.3 and B1.4. On the opposite side of these grooves, there is a tool holder keyway 1.5. The tool holder keyway 1.5 is used to mount a flat key 7, which transmits the torque of the tool holder 4 to the boring tool holder assembly 1. The tool holder fixing holes 1.8 on the same side as the tool holder keyway 1.5 are countersunk to prevent the bolt heads connecting the tool holder 4 and the tool holder body 1.1 from being exposed. The positional relationship between the mounting slot A1.3, the tool mounting slot B1.4, and the keyway 1.5 determines the positional relationship between the metal cutting tool 2 and the tool holder 4 on the tool crown body 1.1. Specifically, the metal cutting tool 2 and the tool holder 4 can only be positioned on opposite sides of the tool crown body 1.1. This positional relationship dictates that when the boring tool crown assembly 1 is working, the spindle can only feed in the positive direction along the spindle axis by pushing the boring tool crown assembly 1. Otherwise, when the boring tool crown assembly 1 is working, the metal cutting tool 2 will approach... The lack of support on the back of the tool body 2.2 of the tool head 2.1 may cause the fixed position of the metal cutting tool 2 to change, leading to machining failure. When the spindle pushes the boring tool assembly 1 to feed forward along the spindle axis, the spindle is under compressive stress. When the depth of cut or feed rate of the metal cutting tool 2 is large, the spindle is prone to vibration. Therefore, it is necessary to reduce the depth of cut and feed rate, which seriously affects the machining efficiency and surface quality of large-diameter deep holes. This is the main reason why the existing boring tool assembly 1 cannot improve the machining efficiency of large-diameter deep holes. In addition, machining large-diameter deep holes requires multiple roughing and finishing processes. Before proceeding to the next process after the previous process is completed, the boring tool assembly 1 needs to be removed from the spindle, and the mounting position of the metal cutting tool 2 needs to be adjusted using a special tool setting fixture to ensure the diameter of the hole after the next process (determining the depth of cut of the metal cutting tool 2 in the next process). The above-mentioned disassembly and assembly of the boring tool assembly 1 and adjustment of the mounting position of the metal cutting tool 2 is labor-intensive (the boring tool assembly 1 is quite heavy and requires the assistance of an overhead crane for disassembly and assembly), cumbersome, and time-consuming, which also seriously affects the machining efficiency of parts. For example, when the hot rolling mill pressing hole in the aluminum alloy hot rolling production line is machined using the existing boring tool assembly 1, it requires four shifts, totaling about 32 hours. See the instruction manual appendix Figure 5 The attached figure illustrates the interference between the structure of the workpiece 10 and the spindle box of the CNC boring and milling machine when machining large-diameter deep holes using the existing boring tool assembly 1 with forward feed in certain situations (the CNC boring and milling machine spindle box and spindle are not shown in the figure). The workpiece 10 shown in the figure has a step on its front end face, with the deep hole 10.2 located on the lower step surface. Additionally, the bottom of the deep hole 10.2 has a deep hole step surface 10.3. When machining the deep hole 10.2, the existing boring tool assembly 1 can only use forward feed. Furthermore, due to the structural limitations of the deep hole step surface 10.3 at the bottom of the deep hole 10.2, the machining of the deep hole 10.2 can only proceed from the workpiece 10.2. The cutting tool begins to feed into the front face of the workpiece 10. Because the boss 10.1 on the front face of the workpiece 10 will interfere with the spindle box of the CNC boring and milling machine (avoiding interference requires the spindle box of the CNC boring and milling machine to retract), and given the limitation of the maximum feed depth of the CNC boring and milling machine spindle, the deep hole 10.2 of the workpiece 10 cannot be machined to the bottom under this condition, so the machining of the deep hole 10.2 cannot be completed. If the solution of lengthening the tool holder 4 is adopted, the rigidity of the spindle will be further deteriorated, and the vibration during the machining process will be uncontrollable. Therefore, the workpiece 10 has to be outsourced for machining, resulting in high machining and transportation costs for the workpiece 10.
[0019] The present invention discloses a large-diameter boring tool crown combination structure for a CNC boring and milling machine, which is a new technical solution to solve the above-mentioned problems; See the instruction manual appendix Figure 9 , 10 The large-diameter boring tool crown assembly structure of this utility model is based on the existing tool crown body 1.1 structure. On the tool crown body 1.1, there are tool mounting slots A1.3 and B1.4, and on the same side, there is also a tool crown keyway 1.5; see the appendix of the specification. Figure 6 , 78: The boring tool assembly 1 includes a tool head body 1.1, a metal cutting tool 2, and a tool holder 4. After a tool head keyway 1.5 is also provided on the same side as the tool mounting slots A1.3 and B1.4 on the tool head body 1.1, the metal cutting tool 2 and tool holder 4 can also be positioned on the same side of the tool head body 1.1. This positional arrangement of the metal cutting tool 2 and tool holder 4 on the tool head body 1.1 allows the spindle to pull the boring tool assembly 1 in the reverse direction along the spindle axis during operation, enabling the machining of large-diameter deep holes; while the spindle pulls the boring tool... When the crown assembly 1 feeds in the reverse direction along the spindle axis, the spindle is subjected to tensile stress. Even when the metal cutting tool 2 has a large depth of cut or feed rate, the spindle is not prone to vibration, thereby greatly improving the machining efficiency and surface quality of large-diameter deep holes. Taking the machining of hot-rolled archway pressing holes as an example, the machining of large-diameter boring tool crown assembly structure of the CNC boring and milling machine of this utility model reduces the original four shifts to less than one shift, and the machining time is reduced from 32 hours to less than 8 hours, improving the machining efficiency by more than four times. In this embodiment, countersunk holes are provided at both ends of the tool crown fixing hole 1.8. It should be further explained that: after adopting the large-diameter boring tool head assembly structure of the CNC boring and milling machine of this utility model, the machining of large-diameter deep holes can still be carried out by the original spindle pushing the boring tool head assembly 1 to feed forward along the spindle axis, or the spindle can pull the boring tool head assembly 1 to feed backward along the spindle axis, making the machining method more flexible; however, when the spindle pulls the boring tool head assembly 1 to feed backward along the spindle axis, in order to prevent the connection between the tool holder 4 and the spindle from loosening (the tool holder 4 and the spindle are connected by a tapered surface to transmit torque), a bolt hole needs to be machined at the tail end of the tool holder 4, and a long bolt is used to tighten the connection between the tool holder 4 and the spindle to prevent the tool holder 4 from loosening between the spindle and the spindle during the operation of the boring tool head assembly 1.
[0020] See the instruction manual appendix Figure 12 The attached figure illustrates how the boring tool assembly 1 of this invention solves the interference problem between the workpiece 10 and the CNC boring and milling machine spindle box when machining large-diameter deep holes using reverse feed. When machining deep holes 10.2 using reverse feed, the spindle is positioned on the rear end face of the workpiece 10, thus allowing the CNC boring and milling machine spindle box to avoid the boss 10.1 on the front end face of the workpiece 10, preventing interference between them. At the start of machining deep holes 10.2, the spindle extends through the through hole in the middle of the deep hole step surface 10.3 to the outside of the front end face of deep holes 10.2. The boring tool assembly 1 is fixedly positioned on the front end face of the spindle. The spindle pulls the boring tool assembly 1 to rotate towards the rear end face of the workpiece 10, completing the cutting of deep holes 10.2.
[0021] In a specific implementation of the large-diameter boring tool crown assembly structure for a CNC boring and milling machine of this utility model, the tool mounting grooves A1.3 and B1.4 of the tool crown body 1.1 can be set to have equal depths. For example, the dimensions of both tool mounting grooves A1.3 and B1.4 are set to 200*40*35 (length*width*depth). The equal depth of the tool mounting grooves ensures that when the boring tool crown assembly 1 is working, the two metal cutting tools 2 on the tool crown body 1.1 are mounted in the same position, that is, the distance between the tip of the two metal cutting tools 2 and the axis of the tool crown positioning hole 1.2 is equal. This embodiment is suitable for the finishing of large-diameter deep holes. Preferably, in another embodiment of the large-diameter boring tool crown assembly structure of the CNC boring and milling machine, the depths of the tool mounting slots A1.3 and B1.4 of the tool crown body 1.1 can also be set to be unequal. For example, the dimensions of tool mounting slot A1.3 are set to 200*40*35 (length*width*depth), and the dimensions of tool mounting slot B1.4 are set to 200*40*25 (length*width*depth), that is, the depth difference between tool mounting slot A1.3 and tool mounting slot B1.4 is 10mm. This setting of unequal tool mounting slot depths actually results in the tool tips of the two metal cutting tools 2 being 10mm apart along the axis of the tool holder 4 after installation. The positional difference; to ensure that the depth of cut of the two metal cutting tools 2 is the same during the machining process, the distance between the tip of the two metal cutting tools 2 and the axis of the tool crown positioning hole 1.2 is set to be unequal; for example, if the total machining allowance (diameter) in one cut is 10mm, then the distance between the tip of the two metal cutting tools 2 and the axis of the tool crown positioning hole 1.2 differs by 2.5mm, and the depth of cut of each metal cutting tool 2 is 2.5mm. That is, when the total machining allowance is large, the depth of cut of each metal cutting tool 2 can be reduced. Therefore, a higher feed rate can be used during the machining process to improve machining efficiency. Therefore, this embodiment is suitable for roughing of large-diameter deep holes.
[0022] Preferably, in the implementation of the novel CNC boring and milling machine large-diameter boring tool crown combination structure, tool mounting slots A1.3 and B1.4 can be provided with tool fixing bolt holes 1.7 on both sides (not shown in the attached drawings). This setting of tool fixing bolt holes 1.7 can make the mounting of metal cutting tools 2 more flexible.
[0023] For further details, please refer to the appendix to the instruction manual. Figure 6-10In a specific implementation of the large-diameter boring tool crown assembly structure for a CNC boring and milling machine, a tool mounting groove base plate 1.6 is provided on the inner side of the tool mounting groove, and an adjusting bolt baffle 6 is fixedly provided on the outer side of the tool mounting groove base plate 1.6; the tool mounting groove base plate 1.6 and the adjusting bolt baffle 6 are provided with through holes; a tool adjusting bolt 5 (hexagon socket head cap screw) is provided in the through hole of the tool mounting groove base plate 1.6, and the bolt head of the tool adjusting bolt 5 is located between the tool mounting groove base plate 1.6 and the adjusting bolt baffle 6; the outer circular surface of the bolt head of the tool adjusting bolt 5 is uniformly engraved with scale lines by laser, and the outer surface of the tool mounting groove base plate 1.6 or the adjusting bolt baffle 6 is engraved with a reference line by laser; see the appendix of the specification. Figure 11 The metal cutting tool 2 includes a cutting head 2.1 and a cutting body 2.2. The cutting body 2.2 has an adjusting bolt hole 2.3 on its tail end face. When the metal cutting tool 2 is fixedly mounted on the cutting head body 1.1, the tool adjusting bolt engages with the adjusting bolt hole 2.3 of the metal cutting tool 2. The boring tool assembly 1 is equipped with a tool adjusting bolt 5. During the machining of the deep hole 10.2, after one machining operation is completed, the spindle pushes the boring tool assembly 1 to retract the tool (during which the boring tool assembly 1 continues to rotate in the cutting direction), exiting to the front end face of the deep hole 10.2. It is not necessary to remove the boring tool assembly 1 from the spindle, loosen the tool fixing bolt, and then pass it through the through hole on the adjusting bolt baffle 6. Using an Allen wrench, the tool adjusting bolt 5 is turned to drive the metal cutting tool 2 in... The tool mounting slots A1.3 and B1.4 move outward along the radial direction of the tool crown positioning hole 1.2 to adjust the cutting amount of the next process. The cutting amount of the next process is determined by the scale line set on the outer circumference of the bolt head of the tool adjusting bolt. Therefore, between multiple roughing and finishing processes, the operation of removing the boring tool crown assembly 1 and adjusting the tool mounting position with the tool setting fixture is eliminated, thus greatly shortening the adjustment time of the boring tool crown assembly 1 when machining large-diameter deep holes.
[0024] The parts of this utility model not described in detail are existing technologies.
Claims
1. A combination structure for a large-diameter boring tool crown on a CNC boring and milling machine, characterized in that: The boring tool assembly (1) includes a tool body (1.1), a metal cutting tool (2), and a tool holder (4). The tool body (1.1) has a tool mounting groove at each end on one side, and a through tool positioning hole (1.2) is provided between the two tool mounting grooves. Both ends of the tool positioning hole (1.2) are provided with tool keyways (1.5), and through tool fixing holes (1.8) are evenly distributed around the tool positioning hole (1.2). When the large-diameter boring tool of the CNC boring and milling machine is working, the metal cutting tool (2) is fixedly installed in one or two tool mounting grooves, and the tool holder (4) is fixedly installed on the same side as the tool mounting groove or on the opposite side of the tool mounting groove through the tool positioning hole (1.2) and the tool keyway (1.5).
2. The large-diameter boring tool crown assembly structure for CNC boring and milling machines according to claim 1, characterized in that: The two tool mounting slots have a height difference.
3. The large-diameter boring tool crown assembly structure for CNC boring and milling machines according to claim 1, characterized in that: The two tool mounting slots have the same depth.
4. The large-diameter boring tool crown assembly structure for CNC boring and milling machines according to claim 1, characterized in that: The blade fixing hole (1.8) has countersunk holes at both ends.
5. The large-diameter boring tool crown assembly structure for CNC boring and milling machines according to claim 1, characterized in that: The tool mounting slot has a tool fixing bolt hole (1.7) on one of its two opposite sides.
6. The large-diameter boring tool crown assembly structure for CNC boring and milling machines according to claim 1, characterized in that: The tool mounting slot has tool fixing bolt holes (1.7) on both opposite sides.
7. The large-diameter boring tool crown assembly structure for CNC boring and milling machines according to claim 1, characterized in that: A tool mounting slot bottom plate (1.6) is provided on the inner side of the tool mounting slot, and an adjusting bolt baffle (6) is fixedly provided on the outer side of the tool mounting slot bottom plate (1.6); the tool mounting slot bottom plate (1.6) and the adjusting bolt baffle (6) are provided with through holes; a tool adjusting bolt (5) is provided in the through hole of the tool mounting slot bottom plate (1.6), and the bolt head of the tool adjusting bolt (5) is located between the tool mounting slot bottom plate (1.6) and the adjusting bolt baffle (6).
8. The large-diameter boring tool crown assembly structure for CNC boring and milling machines according to claim 7, characterized in that: The metal cutting tool (2) includes a tool head (2.1) and a tool body (2.2). The tool body (2.2) has an adjustment bolt hole (2.3) on its tail end face. The tool adjustment bolt (5) engages with the adjustment bolt hole (2.3) on the tail end face of the tool body (2.2).