A cbn cutter head with a 88° main rake angle

Abstract

The utility model discloses a CBN cutter head of 88 degree main deviation angle, including cutter head main part, the side of cutter head main part is equidistantly distributed and is opened with a plurality of V type grooves, and the inner wall of the side of V type groove to the cutting direction of cutter head main part is opened with insert mounting groove, and the inside of insert mounting groove is installed with CBN insert, and the lateral pressing plate of insert in V type groove is matched through stud bolt, and the double anti -looseness mechanism is formed, can effectively avoid the lateral pressing plate loosening problem of insert when cutter head main part high -speed rotation, and the cutting impact force of centrifugal force leads, makes the compression force of CBN insert and keeps stable, and then reduces the cutting size error, and the machining precision of precision part is improved significantly, through the adaptive design of V type groove and insert mounting groove, the modularization fixed mode of the module of insert lateral pressing plate is matched, can improve the replacement time of CBN insert, especially suitable for the quick tool changing demand in batch production, and improves equipment utilization rate.

Description

Technical Field

[0001] This utility model relates to the field of CNC machining tool technology, specifically a CBN tool head with an 88° principal cutting edge angle. Background Technology

[0002] In the machining industry, the cutting of some high-hardness materials (such as high-temperature alloys, cast iron, etc.) requires the use of CBN inserts as special cutting tools.

[0003] In current mainstream machining processes, the machining of high-hardness alloy materials typically involves using existing indexable cutting tools, with inserts of suitable material being replaced. This process presents a dilemma: while CBN (cubic boron nitride) inserts offer superior performance, their high cost significantly increases overall machining costs; however, not using CBN inserts leads to a substantial reduction in machining efficiency. After all, CBN inserts possess unparalleled advantages when machining such challenging materials.

[0004] However, CBN inserts also face a thorny problem in practical applications. Due to their unique design characteristics, they cannot be universally mounted on indexable tool holders or tool shanks like ordinary inserts. This means that if CBN inserts are to be used professionally and efficiently in the machining of difficult materials, existing tooling systems must be specifically optimized. Based on this, it is necessary to develop and propose a CBN tool holder with an 88° principal cutting edge angle to meet such machining requirements. Utility Model Content

[0005] The purpose of this invention is to provide a CBN cutter head with an 88° principal cutting angle, which is suitable for CBN blade installation and reasonable use, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A CBN cutter head with an 88° principal cutting edge angle includes a cutter head body. Several V-shaped grooves are evenly distributed on the side of the cutter head body. A blade mounting groove is formed on the inner wall of the side of the V-shaped groove facing the cutting direction of the cutter head body. A CBN blade is installed inside the blade mounting groove. A blade lateral pressure plate is installed inside the V-shaped groove to clamp and fix the CBN blade laterally. A double-ended screw is installed between the blade lateral pressure plate and the inner bottom of the V-shaped groove.

[0008] Preferably, the inner bottom of the V-groove is provided with a double-ended screw mounting hole, and the blade side pressure plate is provided with a double-ended screw left-hand threaded hole. The bottom of the double-ended screw has a right-hand thread that mates with the double-ended screw mounting hole, and the top has a left-hand thread that mates with the double-ended screw left-hand threaded hole on the blade side pressure plate. When tightened, it can form a two-way anti-loosening mechanism to ensure that the clamping force of the blade side pressure plate on the CBN blade is stable.

[0009] Preferably, the blade has a blade contact surface on one side of the pressure plate, and the blade contact surface abuts against one side wall of the CBN blade.

[0010] Preferably, the inner bottom of the blade mounting groove is provided with an axially positioned blade positioning edge A, and the inner wall of the blade mounting groove away from the opening side is provided with a radially positioned blade positioning edge B. The blade positioning edge A and the blade positioning edge B are perpendicularly matched. Lateral pressure is applied by the blade lateral pressure plate to realize the positioning and fixation of the CBN blade in the blade mounting groove.

[0011] Preferably, the CBN blade is configured as a cube, and all four sides of both sides of the CBN blade are provided with rounded chamfers of R0.1mm to prevent the cutting edge from chipping during cutting.

[0012] Preferably, one end of the cutter head body is provided with a tool holder mounting center hole, and two symmetrically arranged tool holder positioning grooves are provided on both sides of the top of the tool holder mounting center hole.

[0013] Preferably, the end of the cutter head body away from the tool holder positioning groove is provided with a countersunk hole for tool holder mounting locking screws, and the countersunk hole for tool holder mounting locking screws is connected to the tool holder mounting center hole for installing tool holder locking screws.

[0014] Preferably, the cutter head body is made of H13 high-hardness alloy material.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model uses a double-headed screw in conjunction with a blade side pressure plate in a V-groove to form a double anti-loosening mechanism, which can effectively prevent the blade side pressure plate from loosening due to centrifugal force and cutting impact force when the cutter head body rotates at high speed. This keeps the clamping force of the CBN blade stable, thereby reducing cutting dimension error and significantly improving the machining accuracy of precision parts.

[0017] 2. This utility model, through the matching design of V-groove and blade mounting groove, combined with the modular fixing method of blade side pressure plate, can improve the replacement time of CBN blades, and is especially suitable for the rapid tool change requirements in mass production, thereby improving equipment uptime. Attached Figure Description

[0018] Figure 1This is a top view of the three-dimensional structure of the present invention;

[0019] Figure 2 This is a bottom view of the main body of the cutter head of this utility model;

[0020] Figure 3 This is a schematic diagram of the exploded structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the blade side pressure plate of this utility model;

[0022] Figure 5 This is a side view of the three-dimensional structure of the present invention;

[0023] Figure 6 This is a schematic diagram of the CBN blade of this utility model.

[0024] In the diagram: 1. Tool head body; 2. Tool holder mounting center hole; 3. Tool holder positioning groove; 4. Locking screw countersunk hole; 5. V-groove; 6. CBN blade; 7. Blade side pressure plate; 71. Double-ended screw left threaded hole; 72. Blade mating surface; 8. Double-ended screw; 9. Blade mounting groove; 10. Blade positioning edge A; 11. Double-ended screw mounting threaded hole; 12. Blade positioning edge B. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-6 This utility model provides a technical solution:

[0027] A CBN cutter head with an 88° principal cutting edge angle includes a cutter head body 1. Several V-shaped grooves 5 are evenly distributed on the side of the cutter head body 1. A blade mounting groove 9 is formed on the inner wall of the side of the V-shaped groove 5 facing the cutting direction of the cutter head body 1. A CBN blade 6 is installed inside the blade mounting groove 9. A blade side pressure plate 7 is installed inside the V-shaped groove 5 to press and fix the CBN blade 6 laterally. A double-ended screw 8 is installed between the blade side pressure plate 7 and the inner bottom of the V-shaped groove 5.

[0028] It should be noted that by setting equidistant V-grooves 5 and matching blade mounting grooves 9, combined with the fixing structure of the blade side pressure plate 7 and double-headed screws 8, the CBN blade 6 is stably installed and can be easily and quickly replaced.

[0029] In an optional embodiment: the inner bottom of the V-groove 5 is provided with a double-ended screw mounting hole 11, and the blade side pressure plate 7 is provided with a double-ended screw left thread hole 71. The bottom of the double-ended screw 8 is a right-hand thread that mates with the double-ended screw mounting hole 11, and the top is a left-hand thread that mates with the double-ended screw left thread hole 71 of the blade side pressure plate 7. When tightened, it can form a two-way anti-loosening mechanism to ensure that the clamping force of the blade side pressure plate 7 on the CBN blade 6 is stable.

[0030] It should be noted that by setting the bidirectional threaded engagement structure of the double-ended screw 8, the side pressure plate 7 of the blade is effectively prevented from loosening during the high-speed rotation and cutting process of the cutter head, ensuring that the CBN blade 6 is always in a stable and pressed state. When the double-ended screw 8 rotates clockwise, the side pressure plate 7 of the blade moves downward to press the CBN blade 6, and when it rotates counterclockwise, the side pressure plate 7 of the blade moves upward to release the CBN blade 6.

[0031] In an optional embodiment: a blade contact surface 72 is provided on one side of the blade side pressure plate 7, and the blade contact surface 72 abuts against one side wall of the CBN blade 6.

[0032] It should be noted that by setting a blade contact surface 72 that is adapted to the side wall of the CBN blade 6, the contact area with the CBN blade 6 is increased, the clamping force is distributed more evenly, and the CBN blade 6 is prevented from being damaged due to excessive local force.

[0033] In an optional embodiment: the inner bottom of the blade mounting groove 9 is provided with an axially positioned blade positioning edge A10, and the inner wall of the blade mounting groove 9 away from the opening side is provided with a radially positioned blade positioning edge B12. The blade positioning edge A10 and the blade positioning edge B12 are perpendicularly engaged. Lateral pressure is applied by the blade lateral pressure plate 7 to achieve the positioning and fixation of the CBN blade 6 in the blade mounting groove 9.

[0034] It should be noted that by setting mutually perpendicular blade positioning edges A10 and B12, the axial and radial displacement of the CBN blade 6 is precisely limited, ensuring the consistency of the CBN blade 6 installation position and guaranteeing the cutting accuracy.

[0035] In an optional embodiment: the CBN blade 6 is configured as a cube shape, and the four sides of both sides of the CBN blade 6 are provided with rounded chamfers of R0.1mm to prevent the cutting edge from chipping during cutting.

[0036] It should be noted that by setting the CBN insert 6 to a cube shape and setting rounded chamfers of R0.1mm on all four sides, the utilization rate of the CBN insert 6 is improved (it can be used on both sides), while avoiding chipping of the cutting edge during cutting and extending the service life of the CBN insert 6.

[0037] In an optional embodiment: a tool holder mounting center hole 2 is provided at one end of the tool holder body 1, and two symmetrically arranged tool holder positioning grooves 3 are provided on both sides of the top of the tool holder mounting center hole 2.

[0038] It should be noted that by setting the tool holder mounting center hole 2 and two symmetrical tool holder positioning grooves 3, the tool head body 1 and the tool holder can be quickly positioned and installed, ensuring the coaxiality of the tool head body 1 and the tool holder, and reducing the impact of installation errors on cutting accuracy.

[0039] It is worth noting that when the CBN insert 6 is installed on the cutter head body 1, given that the insert is a regular square, the CBN insert 6 is tilted forward by 5 degrees according to the rotation direction of the cutter head body 1. This tilting setting ensures that the bottom corner of the CBN insert 6 is lower than the cutting edge, laying a good foundation for subsequent cutting operations.

[0040] In the side cutting direction of CBN insert 6, the main cutting edge angle of the insert has been optimized and precisely adjusted to 88 degrees. This allows the inner angle of the bottom cutting edge of CBN insert 6 to be higher than the outer angle of the bottom cutting edge, which effectively reduces cutting resistance during the cutting process and thus improves machining efficiency and machining quality.

[0041] In an optional embodiment: the end of the cutter head body 1 away from the tool holder positioning groove 3 is provided with a countersunk hole 4 for tool holder mounting locking screw, and the countersunk hole 4 for tool holder mounting locking screw communicates with the tool holder mounting center hole 2 for mounting the tool holder locking screw.

[0042] It should be noted that by setting the countersunk hole 4 for the tool holder mounting locking screw, the tool holder locking screw can be installed in a concealed manner, avoiding the screw head from being exposed and affecting the rotational balance of the tool disc body 1, while also enhancing the stability of the connection between the tool disc body 1 and the tool holder.

[0043] In an optional embodiment: the cutter head body 1 is made of H13 high-hardness alloy material.

[0044] It should be noted that by using H13 high-hardness alloy material to make the cutter head body 1, the cutter head body 1 has achieved high hardness and wear resistance, and can withstand the impact and friction during the cutting process, thus ensuring the stability and service life of the overall structure of the cutter head body 1.

[0045] Working principle: During operation, the cutter head body 1 is first precisely positioned with the tool holder through the tool holder mounting center hole 2 and tool holder positioning groove 3, and then fixed by the tool holder mounting locking screw, ensuring the stability and coaxiality of the cutter head body 1 during rotation. When the cutter head body 1 rotates to perform cutting operations, the CBN insert 6 maintains a precise position under the positioning action of the insert positioning edge A10 and insert positioning edge B12. At the same time, it is stably pressed under the bidirectional anti-loosening structure of the insert side pressure plate 7 and double-ended screw 8, preventing displacement under the action of cutting force. The cubic CBN insert 6 cuts with a rounded chamfered cutting edge, effectively preventing the cutting edge from chipping. The cutter head body 1, made of H13 high-hardness alloy material, provides solid support for the entire structure and withstands various forces during the cutting process, thereby achieving efficient and precise cutting operations.

[0046] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A CBN cutter head of 88° principal angle of offset, characterised in that, The tool includes a cutter head body (1), and a number of V-shaped grooves (5) are evenly distributed on the side of the cutter head body (1). A blade mounting groove (9) is provided on the inner wall of the side of the V-shaped groove (5) facing the cutting direction of the cutter head body (1). A CBN blade (6) is installed inside the blade mounting groove (9), and a blade side pressure plate (7) is installed inside the V-shaped groove (5) to press and fix the CBN blade (6) laterally. A double-ended screw (8) is installed between the blade side pressure plate (7) and the inner bottom of the V-shaped groove (5).

2. The CBN cutter head with an 88° principal cutting edge angle according to claim 1, characterized in that: The inner bottom of the V-groove (5) is provided with a double-ended screw mounting hole (11), and the blade side pressure plate (7) is provided with a double-ended screw left thread hole (71). The bottom of the double-ended screw (8) is a right-hand thread that fits with the double-ended screw mounting hole (11), and the top is a left-hand thread that fits with the double-ended screw left thread hole (71) of the blade side pressure plate (7). When tightened, it can form a two-way anti-loosening mechanism to ensure that the clamping force of the blade side pressure plate (7) on the CBN blade (6) is stable.

3. A CBN cutter head of 88° primary rake angle according to claim 1, characterized in that: The blade side pressure plate (7) has a blade contact surface (72) on one side, and the blade contact surface (72) abuts against one side wall of the CBN blade (6).

4. The 88° primary angle of deviation CBN cutter head of claim 1 wherein: The inner bottom of the blade mounting groove (9) is provided with an axially positioned blade positioning edge A (10), and the inner wall of the blade mounting groove (9) away from the opening side is provided with a radially positioned blade positioning edge B (12). The blade positioning edge A (10) and the blade positioning edge B (12) are perpendicularly matched. Lateral pressure is applied by the blade lateral pressure plate (7) to realize the positioning and fixing of the CBN blade (6) in the blade mounting groove (9).

5. The 88° primary angle of deviation CBN cutterhead of claim 1 wherein: The CBN blade (6) is set in a cube shape, and the four sides of both sides of the CBN blade (6) are provided with a rounded chamfer of R0.1mm to prevent the cutting edge from breaking during cutting.

6. A CBN cutter head of 88° primary rake angle according to claim 1, characterized in that: The cutter head body (1) has a tool holder mounting center hole (2) at one end, and two symmetrically arranged tool holder positioning grooves (3) are opened on both sides of the top of the tool holder mounting center hole (2).

7. A CBN cutter head of 88° primary rake angle according to claim 6, characterised in that: The cutter head body (1) has a countersunk hole (4) for the tool holder mounting locking screw at one end away from the tool holder positioning groove (3), and the countersunk hole (4) for the tool holder mounting locking screw is connected to the tool holder mounting center hole (2) for the installation of the tool holder locking screw.

8. A CBN cutter head with an 88° principal cutting edge angle according to claim 1, characterized in that: The cutter head body (1) is made of H13 high hardness alloy material.

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