Multifunctional indexable heavy boring head

Abstract

The invention relates to the technical field of machining numerical control tools, in particular to a multifunctional indexable heavy boring head which comprises a main body, a blade seat and a blade, the main body comprises a body, a seat body and a connecting part which are integrally formed, the blade is fixedly installed on the blade seat, the seat body comprises a seat body H and a seat body S, the seat body H is higher than the seat body S, and the connecting part is connected with the seat body H; the blade seat comprises a blade seat H and a blade seat S, the blade seat H is higher than the blade seat S, the blade seat H is fixedly installed on one seat body, and the blade seat S is fixedly installed on the other seat body. The device has the advantages that the device is simple in overall structural design, easy to understand by an operator, small in accessory type number and convenient to assemble; by means of the same double-edge heavy boring head, switching between symmetrical boring and stepped boring can be achieved only by adjusting the position of the tool changing base on the base body and then adjusting the blade in the radial direction, tool changing is not needed, production efficiency is improved, switching is easy and convenient, and the tool storage pressure of a tool stock is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing numerical control tools, in particular to a multifunctional indexable rough boring head. Background Art

[0002] In the field of mechanical manufacturing hole processing, boring tools are very important and widely used CNC tools. The main function of rough boring tools is to quickly remove metal excess when expanding holes. With the continuous development of high-speed, high-efficiency chip cutting technology and chip cutting machine tools, higher requirements are placed on the processing efficiency and reliability of boring tools. At present, double-edged rough boring tools with high processing efficiency are widely used, but the existing adjustable double-edged rough boring tools still have the following shortcomings: ① In order to ensure the processing quality and efficiency, the boring head must have sufficient rigidity, so the cutter head and the main body must be tightly connected together. Some existing designs are to design the cutter head and the main body as a tooth connection or use an eccentric connection design to ensure the tightness of the connection. These designs are very clever, but the overall structure is relatively complex and difficult for operators to understand.

[0003] ② The existing double-edged rough boring tools often have complex radial adjustment mechanisms, many types of accessories, and are difficult to assemble. At the same time, there are often hidden dangers of the adjustment mechanism falling off and the boring hole size being unstable during use.

[0004] ③ Existing rough boring tools generally focus on metal removal rate, have a bulky structure, are not friendly to low-power machine tools, and cannot take into account both usage scenarios.

[0005] ④ The blade of the existing double-edged rough boring tool cannot be adjusted in the axial direction. When switching between symmetrical boring and step boring, the rough boring tool needs to be replaced, resulting in reduced production efficiency. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a multifunctional indexable rough boring head. Through the same double-edged rough boring head, it is only necessary to adjust the position of the tool change seat on the seat body and then adjust the blade radially to achieve switching between symmetrical boring and step boring. There is no need to change the tool, thereby improving production efficiency. Moreover, the switching is simple and convenient, and the tool storage pressure in the tool library is reduced.

[0007] The purpose of the present invention is achieved through the following technical solutions: A multifunctional indexable rough boring head comprises a main body, a blade seat and a blade, wherein the main body comprises an integrally formed main body, a seat body and a connecting portion, the blade is fixedly mounted on the blade seat, the seat body comprises a seat body H and a seat body S, the seat body H is higher than the seat body S, the blade seat comprises a blade seat H and a blade seat S, the blade seat H is higher than the blade seat S, the blade seat H is fixedly mounted on one of the seat bodies, and the blade seat S is fixedly mounted on the other seat body.

[0008] The height difference between the blade seat H and the blade seat S is equal to the height difference between the seat body H and the seat body S, and threaded holes are respectively provided on the seat body H and the seat body S.

[0009] Two adjusting grooves are formed at the top of the main body. The two adjusting grooves are centrosymmetric about the axis of the main body. Two adjusting holes are further provided on the main body. The adjusting holes correspond to the adjusting grooves one by one, and the adjusting holes communicate with the corresponding adjusting grooves. The axial direction of the adjusting holes is consistent with the length direction of the corresponding adjusting grooves.

[0010] A fixing hole H is formed on the blade seat H. The fixing hole H is an oblong hole. The blade seat H is locked into the threaded hole on the seat body H or the seat body S through a fastening bolt.

[0011] A fixing hole S is formed on the blade seat S. The fixing hole S is an oblong hole. The blade seat S is locked into the threaded hole on the seat body H or the seat body S through a fastening bolt.

[0012] An adjusting block H is fixedly arranged at the bottom of the blade seat H, and an adjusting block S is fixedly arranged at the bottom of the blade seat S. The adjusting block H and the adjusting block S can extend into the adjusting groove below them. An adjusting bolt is installed in the adjusting groove, and the adjusting bolt is in threaded fit connection with the corresponding adjusting block H or adjusting block S.

[0013] The length of the adjusting bolt is consistent with the length of the adjusting groove. The adjusting bolt is an internal hexagonal bolt, and the outer diameter of the head of the adjusting bolt is larger than the inner diameter of the adjusting hole.

[0014] A vertical mating surface H is provided on one side of the seat body H facing the seat body S, and an inclined mating surface H is provided on the top surface of the seat body H; A vertical mating surface S is provided on one side of the seat body S facing the seat body H, and an inclined mating surface S is provided on the top surface of the seat body S; A vertical positioning surface H and an inclined positioning surface H are provided on the lower side of the blade seat H; A vertical positioning surface S and an inclined positioning surface S are provided on the lower side of the blade seat S.

[0015] The included angle between the inclined mating surface H and the horizontal plane is α, the included angle between the inclined mating surface S and the horizontal plane is α, the included angle between the inclined positioning surface H and the horizontal plane is α, the included angle between the inclined positioning surface S and the horizontal plane is α, and the value range of α is 6-8°.

[0016] The included angle between the axis of the fastening bolt and the vertical plane is β, and the value range of β is 5-7°.

[0017] The present invention has the following advantages: 1. The asymmetric design of the positioning surfaces on both sides of the blade holder and the boring head body features a simple overall structure design, which is easy for operators to understand. There are few types of accessories, and the assembly is convenient. The boring method can be quickly switched, enhancing the operator's usage experience.

[0018] 2. Safe and reliable. After assembly, the entire adjustment mechanism is completely embedded in the adjustment slots of the blade holder and the boring tool body. The adjustment mechanism will not become detached from the tool body due to the inevitable minor vibrations during the machining process. At the same time, the adjustment mechanism has a foolproof design, and operators do not need to spend too much effort to install it correctly, avoiding the situation of the adjustment mechanism detaching from the main body due to assembly reasons.

[0019] 3. The machining dimensions are stable. During the boring process, a radial cutting component force will be generated, which makes the cutting diameter tend to decrease. If this part of the radial component force cannot be well offset, the processed hole diameter will be very unstable. In this design, during the machining process, the adjustment slot on the boring tool body is used to limit the adjustment bolt, and the blade holder will not move relative to its position, effectively suppressing the tendency of the cutting diameter to become smaller during the machining process, making the machining dimensions very stable.

[0020] 4. Two machining methods can be quickly switched. Only by removing the compression screw and swapping the positions of the two blade holders can the switching between the symmetric and stepped boring methods be achieved.

[0021] 5. The adjustment mechanism is integrated on the blade holder, the adjustment hole is located on the main body, the diameter of the adjustment hole is smaller than the diameter of the head of the adjustment screw, and the adjustment wrench can pass through freely. As long as the blade holder, adjustment screw and boring head body are correctly assembled, the adjustment mechanism is completely embedded in the boring head body, eliminating the need for anti - detachment measures such as adhesives and limiting mechanisms, avoiding potential safety hazards such as loosening and flying out of the adjustment mechanism caused by machining vibrations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural view of the present invention; Figure 2 is an exploded structural view of the present invention; Figure 3 is a schematic side view of the present invention; Figure 4 is a three - dimensional structural view of the main body of the present invention; Figure 5 is a schematic side view of the main body of the present invention; Figure 6 is a three - dimensional structural view of the blade holder H of the present invention; Figure 7 is a schematic side view of the blade holder H of the present invention; Figure 8It is a schematic side structure diagram of the blade holder S of the present invention; Figure 9 It is a schematic longitudinal sectional structure diagram of the main body of the present invention; Figure 10 It is a schematic longitudinal sectional structure diagram of the cooperation between the main body of the present invention and one of the blade holders; Figure 11 It is a schematic assembly structure diagram of Embodiment 1 of the present invention; Figure 12 It is a schematic assembly structure diagram of Embodiment 2 of the present invention; In the figure: 1 - main body, 11 - body, 111 - adjustment groove, 12 - seat body H, 121 - vertical mating surface H, 122 - inclined mating surface H, 13 - seat body S, 131 - vertical mating surface S, 132 - inclined mating surface S, 14 - connecting part, 2 - blade holder H, 21 - fixing hole H, 22 - adjustment block H, 23 - vertical positioning surface H, 24 - inclined positioning surface H, 3 - blade holder S, 31 - fixing hole S, 32 - adjustment block S, 33 - vertical positioning surface S, 34 - inclined positioning surface S, 4 - blade, 5 - screw, 6 - fastening bolt, 7 - adjustment bolt, 8 - adjustment hole. Specific embodiments

[0023] The following further describes the present invention with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0024] As Figures 1 to 10As shown, a multi-functional indexable rough boring head includes a main body 1, a toolholder, and a cutting blade 4. The main body 1 is provided with a TMG21 modular interface. The main body 1 includes an integrally formed body 11, a seat body, and a connecting portion 14. The cutting blade 4 is fixedly installed on the toolholder. Specifically, a blade mounting groove is provided at the corner of the toolholder, and the cutting blade 4 is locked and fixed in the corresponding blade mounting groove by a screw 5. The seat body includes a seat body H12 and a seat body S13, and the seat body H12 is higher than the seat body S13. It should be noted that the height of the seat body H12 is the vertical distance between the highest point of the seat body H12 and the lower end surface of the body 11, which is L1; similarly, the height of the seat body S13 is the vertical distance between the highest point of the seat body S13 and the lower end surface of the body 11, which is L2. That is, L1 > L2. The toolholder includes a toolholder H2 and a toolholder S3, and the toolholder H2 is higher than the toolholder S3. It should be noted that the height of the toolholder H2 is the vertical distance between the highest point of the toolholder H2 and the highest point of the inclined positioning surface H24, which is L3; similarly, the height of the toolholder S3 is the vertical distance between the highest point of the toolholder S3 and the highest point of the inclined positioning surface S34, which is L4. That is, L3 > L4. The toolholder H2 is fixedly installed on one of the seat bodies, and the toolholder S3 is fixedly installed on the other seat body. The seat body H12 cooperates with one of the toolholder H2 or the toolholder S3, and the seat body S13 cooperates with the other toolholder.

[0025] In this embodiment, the height difference between the toolholder H2 and the toolholder S3 is equal to the height difference between the seat body H12 and the seat body S13, that is: L3 - L4 = L1 - L2 = ΔL1.

[0026] As Figure 4 、 Figure 9 、 Figure 10 shown, threaded holes are respectively provided on the seat body H12 and the seat body S13. As Figure 6 and Figure 7 shown, a fixing hole H21 is provided on the toolholder H2. The fixing hole H21 is an oblong hole, and the toolholder H2 is locked into the threaded hole on the seat body H12 or the seat body S13 through a fastening bolt 6. As Figure 8 shown, a fixing hole S31 is provided on the toolholder S3. The fixing hole S31 is an oblong hole, and the toolholder S3 is locked into the threaded hole on the seat body H12 or the seat body S13 through a fastening bolt 6.

[0027] The present invention can selectively adjust the cutting diameters of the two cutting blades: As Figure 2 and Figure 4As shown in the figure, two adjustment slots 111 are provided at the top of the body 11. The two adjustment slots 111 are centrosymmetric about the axis of the main body 1. Two adjustment holes 8 are also provided on the body 11. The adjustment holes 8 correspond to the adjustment slots 111 one by one, and the adjustment holes 8 communicate with the corresponding adjustment slots 111. The axial direction of the adjustment holes 8 is consistent with the length direction of the corresponding adjustment slots 111.

[0028] As Figure 6 , Figure 7 and Figure 8 shown in the figure, an adjustment block H22 is fixedly provided at the bottom of the blade seat H2, and an adjustment block S32 is fixedly provided at the bottom of the blade seat S3. The adjustment block H22 and the adjustment block S32 can extend into the adjustment slot 111 below them. An adjustment bolt 7 is installed in the adjustment slot 111. The adjustment bolt 7 is threadedly connected to the corresponding adjustment block H22 or adjustment block S32.

[0029] Furthermore, the length of the adjustment bolt 7 is the same as the length of the adjustment slot 111. The adjustment bolt 7 is an internal hexagonal bolt, and the outer diameter of the head of the adjustment bolt 7 is greater than the inner diameter of the adjustment hole 8. The adjustment slot 111 can limit the movement of the adjustment bolt 7, but the adjustment bolt 7 can rotate freely in the adjustment slot 111. For the convenience of adjustment, an internal hexagonal wrench can pass through the adjustment hole 8 and be inserted into the head of the adjustment bolt 7, so as to drive the adjustment bolt 7 to rotate. At the same time, the adjustment block is restricted by the adjustment slot 111 and can only move along the length direction of the adjustment slot 111, thereby realizing the adjustment of the blade seat in the radial direction.

[0030] In addition, the adjustment slot 111 is provided with an anti-fooling design. Specifically, the size of the adjustment slot 111 on the side close to the adjustment hole 8 is larger than the size on the side far from the adjustment hole 8, ensuring that when installing the adjustment bolt 7, only by correctly orienting the head of the adjustment bolt 7 towards the adjustment hole 8 can the blade seat be assembled with the main body 1, avoiding incorrect assembly caused by operation errors.

[0031] In order to facilitate observing the cutting diameter of the corresponding blade 4, scale lines are provided on the side wall of the seat body, and corresponding indication lines are provided on the tool holder. By reading the value at which the indication line aligns with the scale line, it is the cutting diameter of the blade 4, providing a reference for radial adjustment.

[0032] Example 1: As Figure 12As shown, when the blade seat S3 is fitted with the seat body H12 and the blade seat H2 is fitted with the seat body S13, it is a symmetric boring setup. At this time, the cutting edges of the two blades 4 have the same cutting depth (the axial drop ΔL of the two blades 4 = 0). Symmetric boring is a boring method to achieve high production efficiency. Therefore, when high metal removal rate, high production efficiency are required and the machine tool power is sufficient, symmetric boring is the best choice to achieve the highest productivity.

[0033] Embodiment 2: As Figure 11 shown, when the blade seat S3 is fitted with the seat body S13 and the blade seat H2 is fitted with the seat body H12, it is a stepped boring setup. At this time, the axial drop ΔL of the two blades 4 = 2ΔL1. The cutting edges at different axial heights are at different cutting diameters, forming two cutting diameters Dm and Dc. Among them, Dm removes the allowance and Dc determines the final machining size, and the value of (Dc - Dm) / 2 is not greater than the cutting edge length of the blade. The two blades form an overlap in the radial cutting depth. Therefore, stepped boring is selected when a large radial cutting depth is required; the stepped boring method can better divide the cutting into smaller and easier-to-process cuttings. Therefore, stepped boring is selected in occasions where there are requirements for cutting control when machining long cutting materials; using stepped boring can reduce the number of tools required for machining and the number of tool changes, reduce the occupancy of the machine tool tool magazine, is convenient to use, and can better control the tool cost.

[0034] In this embodiment, ΔL = 2ΔL1 = 0.4 mm.

[0035] The blade seat and the seat body are respectively one high (High, H) and one short (Short, S). In short: when using the "SH - SH" fit, it is symmetric boring. In this state, the cutting diameters of the two blades are the same; when using the "SS - HH" fit, it is stepped boring. In this state, the cutting diameters of the two blades are different.

[0036] To ensure the connection reliability between the blade seat and the boring head body and the overall rigidity of the boring head, the contact surfaces of the seat body and the blade seat are designed.

[0037] Specifically, as Figure 9 shown, one side of the seat body H12 facing the seat body S13 is provided with a vertical mating surface H121, and the top surface of the seat body H12 is provided with an inclined mating surface H122; one side of the seat body S13 facing the seat body H12 is provided with a vertical mating surface S131, and the top surface of the seat body S13 is provided with an inclined mating surface S132; as Figure 7 shown, the lower side of the blade seat H2 is provided with a vertical positioning surface H23 and an inclined positioning surface H24; as Figure 8 shown, the lower side of the blade seat S3 is provided with a vertical positioning surface S33 and an inclined positioning surface S34.

[0038] As Figure 9 and Figure 10 shown, the included angle between the inclined mating surface H122 and the horizontal plane is α, the included angle between the inclined mating surface S132 and the horizontal plane is α, the included angle between the inclined positioning surface H24 and the horizontal plane is α, the included angle between the inclined positioning surface S34 and the horizontal plane is α, and the value range of α is 6 to 8°.

[0039] As Figure 10 shown, the included angle between the axis of the fastening bolt 6 and the vertical plane is β, and the value range of β is 5 to 7°.

[0040] To achieve high-efficiency cutting of the boring head, the boring head must have sufficient rigidity. The connection reliability between the seat body and the blade seat directly affects the overall rigidity of the boring head. In Embodiment 1 and Embodiment 2, the value of α is preferably 7°, and the value of β is preferably 6°.

[0041] Through the CAD-CAE-CAM closed-loop optimization design, the inclined positioning surface at 7° to the horizontal direction and the vertical positioning surface parallel to the main body axis ensure that the seat body and the blade seat have sufficient contact area. At the same time, to ensure that both positioning surfaces can be closely fitted together, the blade seat bolt pressing surface and the inclined positioning surface are designed with an included angle of 13°. The purpose of this design is to make the pressing force generated by the fastening bolt 6 generate a horizontal component force while pressing the inclined positioning surface, pressing the vertical positioning surface, and ensuring that both the inclined positioning surface and the vertical positioning surface can be closely fitted with the seat body. As the locking force increases, the connection between the seat body and the blade seat becomes more reliable, and the overall rigidity is also greatly improved.

[0042] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multifunctional indexable rough boring head, comprising a main body (1), a blade seat and a blade (4), the main body (1) includes an integrally formed body (11), a seat body and a connecting portion (14), the blade (4) is fixedly installed on the blade seat, and is characterized in that: The seat body includes seat body H (12) and seat body S (13), seat body H (12) is higher than seat body S (13), the blade seat includes blade seat H (2) and blade seat S (3), blade seat H (2) is higher than blade seat S (3), blade seat H (2) is fixedly installed on one of the seat bodies, and blade seat S (3) is fixedly installed on the other seat body.

2. A multifunctional indexable rough boring head according to claim 1, characterized in that: The height difference between blade seat H (2) and blade seat S (3) is equal to the height difference between seat body H (12) and seat body S (13), and threaded holes are respectively provided on seat body H (12) and seat body S (13).

3. A multi-functional indexable rough boring head according to claim 2, characterized in that: Two adjustment slots (111) are provided at the top of the body (11), and the two adjustment slots (111) are centrosymmetric about the axis of the main body (1). Two adjustment holes (8) are also provided on the body (11), the adjustment holes (8) correspond to the adjustment slots (111) one by one, and the adjustment holes (8) communicate with the corresponding adjustment slots (111), and the axial direction of the adjustment holes (8) is consistent with the length direction of the corresponding adjustment slots (111).

4. A multi-functional indexable rough boring head according to claim 3, characterized in that: A fixing hole H (21) is provided on blade seat H (2), and fixing hole H (21) is an oblong hole. Blade seat H (2) is locked into the threaded hole on seat body H (12) or seat body S (13) through a fastening bolt (6).

5. A multifunctional indexable rough boring head according to claim 3, characterized in that: A fixing hole S (31) is provided on blade seat S (3), and fixing hole S (31) is an oblong hole. Blade seat S (3) is locked into the threaded hole on seat body H (12) or seat body S (13) through a fastening bolt (6).

6. A multi-functional indexable rough boring head according to claim 4 or 5, characterized in that: An adjustment block H (22) is fixedly provided at the bottom of blade seat H (2), and an adjustment block S (32) is fixedly provided at the bottom of blade seat S (3). The adjustment block H (22) and the adjustment block S (32) can extend into the adjustment slot (111) below them. An adjustment bolt (7) is installed in the adjustment slot (111), and the adjustment bolt (7) is in threaded fit connection with the corresponding adjustment block H (22) or adjustment block S (32).

7. A multi-functional indexable rough boring head according to claim 6, characterized in that: The length of the adjustment bolt (7) is the same as the length of the adjustment slot (111). The adjustment bolt (7) is an internal hexagonal bolt, and the outer diameter of the head of the adjustment bolt (7) is larger than the inner diameter of the adjustment hole (8).

8. A multifunctional indexable rough boring head according to claim 6, wherein: One side of seat body H (12) facing seat body S (13) is provided with a vertical mating surface H (121), and the top surface of seat body H (12) is provided with an inclined mating surface H (122); One side of seat body S (13) facing seat body H (12) is provided with a vertical mating surface S (131), and the top surface of seat body S (13) is provided with an inclined mating surface S (132); A vertical positioning surface H (23) and an inclined positioning surface H (24) are provided on the lower side of blade seat H (2); A vertical positioning surface S (33) and an inclined positioning surface S (34) are provided on the lower side of blade seat S (3).

9. A multi-functional indexable rough boring head according to claim 8, characterized in that: The included angle between the inclined mating surface H (122) and the horizontal plane is α, the included angle between the inclined mating surface S (132) and the horizontal plane is α, the included angle between the inclined positioning surface H (24) and the horizontal plane is α, the included angle between the inclined positioning surface S (34) and the horizontal plane is α, and the value range of α is 6 to 8°.

10. A multifunctional indexable rough boring head according to claim 9, characterized in that: The included angle between the axis of the fastening bolt (6) and the vertical plane is β, and the value range of β is 5 to 7°.

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