A high-precision indexable boring cutter

Abstract

The present application relates to a kind of fine-tuning high-precision indexable boring cutter, belong to cutting tool processing technical field, including non-standard boring cutter matrix, the handle of non-standard boring cutter matrix is equipped with MAS tool shank, three tool holders are respectively installed in the cutting end of non-standard boring cutter matrix, first taper slot is opened between the tool holder and non-standard boring cutter matrix, adjusting device is equipped in the first taper slot, adjusting device includes being installed between non-standard boring cutter matrix and tool holder, the adjusting device includes auxiliary bolt and taper adjusting block, the adjusting device is connected with non-standard boring cutter matrix by auxiliary bolt.This fine-tuning high-precision indexable boring cutter, by setting adjusting auxiliary bolt, reverse control taper block, facilitate to take out taper block and reduce tool diameter, the diameter of adjustable boring cutter is normal wear, diameter size reduction can be compensated by adjusting, so that the whole life of tool is significantly extended, so the tool cost of hole processing is obviously reduced.

Description

Technical Field

[0001] This invention relates to the field of cutting tool processing technology, specifically to a finely adjustable, high-precision indexable boring tool. Background Technology

[0002] Cutting tools are tools used for cutting processes in mechanical manufacturing. The vast majority of tools are machine-made, but some are hand-made. Since the tools used in mechanical manufacturing are basically used for cutting metal materials, the term "tool" is generally understood as metal cutting tools.

[0003] The precision requirements for cutting tools are extremely high during the finishing of workpieces. Even slight wear on the cutting edge can significantly impact the dimensional tolerances of the workpiece. In automobile manufacturing, many parts requiring reaming need precision boring tools. Automotive parts are characterized by complex structures and high machining precision, with very small dimensional tolerances, resulting in stringent requirements for tool manufacturing precision and wear limits. Tool wear during machining often leads to tool failure, significantly increasing manufacturing costs. Furthermore, with the widespread use of CNC machine tools in modern manufacturing, new demands are placed on cutting tools. These include a high degree of standardization and serialization; broad applicability; and the ability to perform precise off-machine pre-adjustment and rapid on-machine tool changes. Currently, widely used standard tools cannot adequately meet these requirements, and the diameter of a standard tool is an empirical value. For a given part, once factors such as cutting parameters, coolant, tool manufacturing precision, and installation positioning are determined, this value may not be optimal. Therefore, this invention proposes a finely adjustable, high-precision, indexable boring tool to address these issues. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a finely adjustable, high-precision, indexable boring tool that offers the advantage of easy adjustment of the tool diameter. This solves the problem in existing technologies where even slight wear on the tool's cutting edge can significantly impact the dimensional tolerances of the workpiece.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a finely adjustable high-precision indexable boring tool, comprising a non-standard boring tool base, wherein the shank of the non-standard boring tool base is provided with a MAS tool holder, and three tool clips are respectively installed on the cutting end of the non-standard boring tool base, wherein a first tapered groove is formed between the tool clips and the non-standard boring tool base, and an adjustment device is provided in the first tapered groove;

[0006] The adjustment device includes an auxiliary bolt and a taper adjustment block, which are installed between the non-standard boring tool base and the tool holder. The adjustment device is connected to the non-standard boring tool base through the auxiliary bolt.

[0007] The tool holders are respectively installed around the cutting end of the non-standard boring tool base. The tool holders consist of a tool holder base, PCD inserts, insert bolts, axial adjustment bolts, and umbrella bolts. The PCD inserts are installed on the cutting end face of the tool holders. The PCD inserts are connected to the tool holders through insert bolts. The umbrella bolts are threaded onto one side surface of the tool holders. The tool holders are connected to the non-standard boring tool base through umbrella bolts.

[0008] A tool setting belt is fixedly installed on one end surface of the non-standard boring tool base, and a scale groove is opened on the shank of the non-standard boring tool base.

[0009] Furthermore, the MAS tool holder and the non-standard boring tool base are integrally formed structures. The surface of the non-standard boring tool base has three tool clamping grooves. A water hole is provided above the tool clamping grooves. A second tapered groove is provided between the tool clamping grooves and the non-standard boring tool base. A cutting clearance groove is provided on the outer surface of the non-standard boring tool base.

[0010] Furthermore, one side of the taper adjustment block is a conical surface that fits against the surface of the non-standard boring tool base, and the other side of the taper adjustment block is a straight surface that fits against the surface of the tool holder during installation. An adjustment groove that mates with the auxiliary bolt is provided on the side of the conical surface. A tool holder clearance hole is provided on the inner side of the taper adjustment block, and a taper block clearance hole is provided on the inner side of the tool holder base. The size of the tool holder clearance hole is the same as that of the taper block clearance hole on the inner side of the tool holder.

[0011] Furthermore, the auxiliary bolt has a fine thread on its surface, and the auxiliary bolt is engaged with the threaded connection of the adjusting groove to drive the taper adjusting block to move.

[0012] Furthermore, the umbrella-shaped bolt passes through the taper block clearance hole and connects to the non-standard boring tool base to fix the tool holder. A tool recess is opened on one side of the cutting end of the tool holder base, and a screw hole is opened inside the tool recess. The blade bolt is threadedly connected to the screw hole to fix the PCD blade to the tool holder together.

[0013] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0014] 1. This finely adjustable high-precision indexable boring bar uses an adjustable auxiliary bolt to reverse control the cone block, making it easy to remove the cone block and reduce the tool diameter. After normal wear, the diameter of the adjustable boring bar can be compensated for by adjustment, thus significantly extending the overall tool life and significantly reducing the tool cost for hole machining.

[0015] 2. This finely adjustable high-precision indexable boring bar, by setting an adjustment device to adjust the machining diameter of the boring bar, not only ensures that the machined size is adjustable and controllable, but also effectively improves the process performance in batch production and reduces the risk of potential scrap generation. The plane in contact with the tapered block and the tool holder is a plane, and the inclination angle of the cutting tool will not change when the tapered block is adjusted to adjust the diameter of the tool. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the structural adjustment device of the present invention;

[0018] Figure 3 This is a schematic diagram of the tool holder structure of the present invention;

[0019] Figure 4 This is a schematic diagram of the non-standard boring tool substrate of the present invention;

[0020] Figure 5 This is a schematic diagram of the tapered adjustment block of the present invention;

[0021] Figure 6 This is a schematic diagram of the tool holder base of the present invention.

[0022] In the diagram: 1. Non-standard boring tool base; 2. Adjustment device; 3. Tool holder; 4. MAS tool holder; 5. Auxiliary bolt; 6. Taper adjustment block; 7. PCD insert; 8. Insert bolt; 9. Axial adjustment bolt; 10. Umbrella bolt; 11. Tool holder groove; 12. First taper groove; 13. Cutting clearance groove; 14. Water hole; 15. Taper surface; 16. Adjustment groove; 17. Taper block clearance hole; 18. Tool holder clearance hole; 19. Tool pit; 20. Tool holder base; 21. Scale groove; 22. Tool setting band; 23. Second taper groove; 24. Screw hole. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figures 1 to 6 In this embodiment, a finely adjustable high-precision indexable boring tool includes a non-standard boring tool base 1. The shank of the non-standard boring tool base 1 is provided with a MAS tool holder 4. Three tool clips 3 are respectively installed on the cutting end of the non-standard boring tool base 1. A first tapered groove 12 is opened between the tool clips 3 and the non-standard boring tool base 1. An adjustment device 2 is provided in the first tapered groove 12.

[0025] The adjustment device 2 is installed between the non-standard boring tool base 1 and the tool holder 3. The adjustment device 2 includes an auxiliary bolt 5 and a taper adjustment block 6. The adjustment device 2 is connected to the non-standard boring tool base 1 through the auxiliary bolt 5.

[0026] The tool holder 3 is installed around the cutting end of the non-standard boring tool base 1. The tool holder 3 consists of a tool holder base 20, a PCD insert 7, an insert bolt 8, an axial adjusting bolt 9, and an umbrella bolt 10. The PCD insert 7 is installed on the cutting end face of the tool holder 3. The PCD insert 7 is connected to the tool holder 3 through the insert bolt 8. The umbrella bolt 10 is threaded onto one side surface of the tool holder 3. The tool holder 3 is connected to the non-standard boring tool base 1 through the umbrella bolt 10.

[0027] A tool setting belt 22 is fixedly installed on one end surface of the non-standard boring tool base 1, and a scale groove 21 is opened on the shank of the non-standard boring tool base 1.

[0028] The MAS tool holder 4 and the non-standard boring tool base 1 are integrally formed. The surface of the non-standard boring tool base 1 has three tool clamping grooves 11. A water hole 14 is provided above the tool clamping grooves 11. A second tapered groove 23 is provided between the tool clamping grooves 11 and the non-standard boring tool base 1. A cutting clearance groove 13 is provided on the outer surface of the non-standard boring tool base 1.

[0029] One side of the taper adjustment block 6 is a tapered surface 15 that fits against the surface of the non-standard boring tool base 1, and the other side of the taper adjustment block 6 is a straight surface that fits against the surface of the tool holder 3 during installation. The side of the tapered surface 15 is provided with an adjustment groove 16 that mates with the auxiliary bolt 5. The inner side of the taper adjustment block 6 is provided with a tool holder clearance hole 18, and the inner side of the tool holder base 20 is provided with a taper block clearance hole 17. The size of the tool holder clearance hole 18 is the same as that of the inner taper block clearance hole 17 of the tool holder.

[0030] The auxiliary bolt 5 has fine thread on its surface. The auxiliary bolt 5 is threaded to the adjusting groove 16 and can move the taper adjusting block 6. The umbrella bolt 10 passes through the taper block clearance hole 17 and is connected to the non-standard boring tool base 1 to fix the tool holder 3. The tool holder base 20 has a tool pit 19 on one side of the cutting end. The tool pit 19 has a screw hole 24 inside. The insert bolt 8 is threaded to the screw hole 24 to fix the PCD insert 7 and the tool holder 3 together.

[0031] The adjustment device 2 works in conjunction with the tool holder 3. When the taper adjustment block 6 is adjusted by the auxiliary bolt 5, the taper adjustment block 6 can push the tool holder 3 to move, thereby changing the maximum cutting diameter of the indexable boring tool. Furthermore, the maximum diameter of the indexable boring tool can be controlled by adjusting the angle of the taper surface 15 during the design stage.

[0032] It should be noted that in this embodiment, the number of tool teeth Z=3 is set. The use of an asymmetrical odd number of tool teeth can effectively avoid machining resonance and extend the service life of the tool and the machine tool. In addition, because the tool body itself has strong hardness, the tool holder maintains strong tool body rigidity during the cutting process, which further reduces the probability of cutting chatter.

[0033] It should be noted that the boring tool base 1 in this embodiment is made of 40Cr tempered steel during production to ensure that the tool has sufficient elasticity and toughness, and will not adversely affect the rigidity of the entire tool during operation. It is heat-treated and hardened to HRC35~45. During the production stage, the MAS tool holder 4 and the non-standard boring tool base 1 are formed as one piece. Three tool clamping grooves 11 are provided around the outer side of the non-standard boring tool base 1 to avoid machining resonance with an asymmetrical odd number of cutting teeth. Cooling water holes 14 are provided above the tool clamping grooves 11. A second tapered groove 23 is opened between the tool clamping grooves 11 and the non-standard boring tool base 1. A cutting clearance groove 13 is opened around the outer side of the non-standard boring tool base 1 to prevent chip accumulation during cutting and thus affect the cutting effect.

[0034] It is understood that the scale groove 21 in this embodiment is used for vibration detection. The tool holder horizontal to the scale groove 21 is tool holder No. 1, and the tool holders in the counterclockwise direction are tool holders No. 2 and No. 3, so that the machine tool can detect the actual number of rotations of the tool and calculate data such as power density and frequency spectrum, so as to discover and correct tool problems in a timely manner.

[0035] It is understood that the tool setting band 22 in this embodiment is 5mm long and is used to adjust the tool runout tolerance. The tool setting band 22 at the tail cutting end is used for tolerance runout detection and adjustment between the workpiece and the tool. The tool setting band 22 between the MAS tool holder 4 and the non-standard boring tool base 1 is used for tolerance runout detection and adjustment between the machine tool and the boring tool, thereby improving the tool accuracy.

[0036] It should be noted that in this embodiment, the adjustment amount of the first taper groove 12 to the tool clip 3 can be changed by designing and calculating the taper angle during the design stage. The side of the taper surface 15 has an adjustment groove 16 that cooperates with the auxiliary bolt 5.

[0037] It is understood that in this embodiment, the material of the adjusting taper block 6 is No. 30 or No. 45 steel, which is hardened to HRC35-40 and the taper surface is ground to a roughness of not less than Ra0.8, so as to ensure that the influence of the taper on the cylindricity error of the diameter is controlled below 0.001mm.

[0038] It should be noted that the tool holder base 20 in this embodiment is quenched and tempered at medium temperature using 40CrMoV during the manufacturing stage, so that the hardness of the tool holder body reaches HRC40-45 Rockwell hardness. It is then subjected to a low-temperature stress-relief annealing process to effectively remove the internal stress caused by deformation of the tool's internal structure and avoid micro-sized changes at the μm level caused by natural aging deformation.

[0039] The diameter of the boring tool is manufactured at 70% of the workpiece's tolerance zone (the difference between the lower tolerance and 70% of the tolerance zone is the tool diameter).

[0040] The working principle of the above embodiments is as follows:

[0041] When fine-tuning the tool size is required, simply turn the auxiliary bolt with a wrench. Adjusting the auxiliary bolt 5 moves the taper adjustment block 6, pushing the tool holder 3 and thus changing the maximum cutting diameter of the tool. Adjusting the auxiliary bolt 5 reverses the control of the taper block, making it easy to remove the taper adjustment block 6 and reduce the tool diameter. The taper adjustment block 6 provides radial adjustment to the tool holder without affecting the inclination angle of the PCD insert 7.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A finely adjustable, high-precision, indexable boring tool, comprising a non-standard boring tool base (1), characterized in that: The non-standard boring tool base (1) is provided with a MAS tool holder (4) at the shank. The cutting end of the non-standard boring tool base (1) is respectively equipped with three tool clips (3). A first tapered groove (12) is provided between the tool clips (3) and the non-standard boring tool base (1). An adjustment device (2) is provided in the first tapered groove (12). The adjustment device (2) is installed between the non-standard boring tool base (1) and the tool holder (3). The adjustment device (2) includes an auxiliary bolt (5) and a taper adjustment block (6). The adjustment device (2) is connected to the non-standard boring tool base (1) through the auxiliary bolt (5). The tool holders (3) are respectively installed around the cutting end of the non-standard boring tool base (1). The tool holder (3) consists of a tool holder base (20), a PCD insert (7), an insert bolt (8), an axial adjustment bolt (9), and an umbrella bolt (10). The PCD insert (7) is installed on the cutting end face of the tool holder (3). The PCD insert (7) is connected to the tool holder (3) through the insert bolt (8). The umbrella bolt (10) is threaded onto one side surface of the tool holder (3). The tool holder (3) is connected to the non-standard boring tool base (1) through the umbrella bolt (10). The non-standard boring tool base (1) has a tool setting belt (22) fixedly installed on one end surface, and the shank of the non-standard boring tool base (1) has a scale groove (21).

2. The adjustable high-precision indexable boring tool according to claim 1, characterized in that: The MAS tool holder (4) and the non-standard boring tool base (1) are integrally formed. The surface of the non-standard boring tool base (1) is provided with three tool clamping grooves (11). A water hole (14) is provided above the tool clamping grooves (11). A second tapered groove (23) is provided between the tool clamping grooves (11) and the non-standard boring tool base (1). A cutting clearance groove (13) is provided on the outer surface of the non-standard boring tool base (1).

3. The adjustable high-precision indexable boring tool according to claim 1, characterized in that: One side of the taper adjustment block (6) is a tapered surface (15) that fits against the surface of the non-standard boring tool base (1). The other side of the taper adjustment block (6) is a straight surface that fits against the surface of the tool holder (3) during installation. The side of the tapered surface (15) is provided with an adjustment groove (16) that cooperates with the auxiliary bolt (5). The inner side of the taper adjustment block (6) is provided with a tool holder clearance hole (18). The inner side of the tool holder base (20) is provided with a taper block clearance hole (17). The size of the tool holder clearance hole (18) is the same as that of the inner taper block clearance hole (17) of the tool holder.

4. The adjustable high-precision indexable boring tool according to claim 1, characterized in that: The auxiliary bolt (5) has a fine thread on its surface. The auxiliary bolt (5) is threaded with the adjusting groove (16) and can drive the taper adjusting block (6) to move.

5. The adjustable high-precision indexable boring tool according to claim 3, characterized in that: The umbrella bolt (10) passes through the taper block clearance hole (17) and connects to the non-standard boring tool base (1) to fix the tool holder (3). The tool holder base (20) has a tool pit (19) on one side of the cutting end. The tool pit (19) has a screw hole (24) inside. The blade bolt (8) is threadedly connected to the screw hole (24) to fix the PCD blade (7) and the tool holder (3) together.

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