An assembled hard alloy slot broach

Abstract

The application discloses an assembled hard alloy slot broach, which comprises a broach holder and blades, and the material of the blades is hard alloy; the broach holder is longitudinally provided with installation grooves for placing multiple blades; the installation grooves are provided with multiple transversely arranged positioning grooves, one blade is placed between two adjacent positioning grooves, a positioning pressing block is movably arranged in the positioning groove, the tangent surface of the positioning pressing block and the front end surface of the blade is a pressing surface P2, the pressing surface P2 of the positioning pressing block is an inclined surface, the stop surface D of the positioning pressing block is tightly abutted against the rear end surface of the previous blade; the installation grooves are further provided with threaded holes at two ends, the threaded holes are threadedly connected with pressing screws two for pressing the blades; each blade is provided with multiple cutting teeth, and the relief surface of each cutting tooth is provided with a chip breaking groove; the application adopts an assembled structure, the blades are made of hard alloy material, has higher wear resistance, and through the novel pressing mode, the hard alloy blade body bears the compressive stress, thereby prolonging the service life of the broach.

Description

Technical Field

[0001] This invention relates to the field of aero-engine tool design technology, and in particular to an assembled carbide grooving broach. Background Technology

[0002] With the continuous development of aero-engine technology, the materials for disc-shaped parts are becoming increasingly difficult to machine, such as powder metallurgy and high-temperature alloys, but the goal remains high-efficiency cutting. Currently, most broaches used for high-speed broaching of tenons and grooves in disc-shaped parts are integral or split high-speed steel structures. The cutting performance of high-speed steel limits the service life of broaches and the improvement of broaching efficiency, necessitating the development of new broaches with better wear resistance and new materials. While using mature cemented carbide materials is an option, the material is expensive, and integral structures are not very suitable. Furthermore, there are problems such as poor tensile strength, high brittleness, and easy chipping of sharp corners. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an assembled cemented carbide grooving broach to solve the above-mentioned problems.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] An assembled cemented carbide grooving broach includes a tool holder and cutting blades. The tool holder is made of high-quality structural steel, and the cutting blades are made of cemented carbide. The tool holder has longitudinally spaced mounting slots for holding multiple cutting blades. The two side base surfaces of the cutting blades mate with the mounting slots for width-direction positioning. The mounting slots have multiple transversely arranged positioning slots, with one cutting blade placed between two adjacent positioning slots. Positioning blocks are fitted within the positioning slots to press the front end face of each cutting blade. The surface of the positioning block tangent to the front end face of the cutting blade is the pressing surface P. 2. The clamping surface P2 of the positioning block is an inclined surface, and the stopping surface D of the positioning block abuts against the rear end face of the previous blade. The positioning block is fixed in the positioning groove by a clamping screw. The mounting groove is also provided with a threaded hole, and a clamping screw is threaded into the threaded hole. The clamping screw passes through the mounting hole on the blade to fix and clamp the blade. Each blade is provided with several cutting teeth. Each cutting tooth has a chip breaking groove along the rear angle α on its back face. The chip breaking grooves are arranged alternately in front, back, left and right on the cutting teeth of each blade.

[0006] Furthermore, in the above-described invention, a transverse positioning key is provided in the positioning groove at the end of the blade holder. The transverse positioning key is fixedly connected to the blade holder by a fixing screw and is used to position and press the blade in the length direction by cooperating with the positioning pressure block.

[0007] In the above-mentioned invention, the angle β″ between the inclined surface and the vertical surface of the positioning block is 10° to 30°.

[0008] Furthermore, in the above-described invention, the chip-breaking groove has a V-shaped structure, and the included angle θ of the V-shape is 60° to 100°.

[0009] Furthermore, in the above-mentioned invention, the included angle θ of the chip breaking groove of the V-shaped structure is 90°, the groove depth h is 0.3 to 1 mm, and the back angle α is 1°30′ to 3°.

[0010] Further, in the above-described invention, the bottom of the chip breaker groove is smoothly connected, with a groove bottom connection radius R1 of R0.3mm to R1mm; and the two sides of the chip breaker groove are smoothly connected to the flank face, with a connection radius R2 of R0.5mm to R1.5mm; the cutting tool tooth tip is smoothly connected to the flank face and tooth side, with a connection radius R3 of R0.5mm to R1.5mm.

[0011] In the above-described invention, the rake angle γ of the cutting tooth is further defined as 8° to 12°.

[0012] Furthermore, in the above-mentioned invention, a tool holder can be equipped with 2 to 6 blades, and each blade has 2 to 12 cutting teeth.

[0013] Furthermore, in the above-described invention, the width of the cutting teeth is 7mm to 16mm.

[0014] The beneficial effects of this invention are:

[0015] The advantages of this invention are that the slotting broach holder and the insert adopt an assembled structure, the insert is made of cemented carbide, which has higher wear resistance, and the new clamping method between the positioning block and the end face of the insert ensures that the cemented carbide insert body is subjected to compressive stress, thus extending the service life of the broach; secondly, a V-shaped chip breaker groove with a smooth transition is set on each cutting tooth of the insert, which is suitable for broaching wider tenons. The entire slotting broach of this invention adopts this material and structure, and the broaching efficiency can be improved by increasing the broaching speed. Attached Figure Description

[0016] Figure 1 This is a front sectional view of the slotting broach of the present invention;

[0017] Figure 2 This is a front view of the tool holder of the present invention;

[0018] Figure 3 Left view of the tool holder of this invention;

[0019] Figure 4 This is a front view of the positioning block of the present invention;

[0020] Figure 5 This is a top view of the positioning block of the present invention;

[0021] Figure 6 This is a front view of the blade of the present invention;

[0022] Figure 7 This is a top view of the blade of the present invention;

[0023] Figure 8 This is a schematic diagram of the chip breaking groove and tooth tip R shape of the blade of the present invention;

[0024] Figure 9 for Figure 8 Sectional view of AA.

[0025] In the diagram, 1-tool holder, 2-blade, 3-positioning block, 4-clamping screw one, 5-clamping screw two, 6-lateral positioning key, 7-fixing screw, 8-positioning groove, 9-chip breaking groove, 10-mounting groove. Detailed Implementation

[0026] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0027] Please see the appendix Figure 1 -Appendix Figure 3 As shown, an assembled cemented carbide grooving broach includes a tool holder 1 and a blade 2. The tool holder 1 is made of high-quality structural steel, and the blade 2 is made of cemented carbide. The better wear resistance of cemented carbide material is used to extend the service life of the grooving broach.

[0028] The tool holder 1 has a longitudinally provided mounting groove 10 for placing multiple blades 2. Multiple blades 2 are detachably placed in the mounting groove 10. Preferably, one tool holder 1 can install 2 to 6 blades 2. The two side base surfaces of the blade 2 cooperate with the mounting groove 10 to position the blade 2 in the width direction.

[0029] The mounting slot 10 has multiple horizontally arranged positioning slots 8. A blade 2 is placed between two adjacent positioning slots 8. A positioning block 3 is installed in the positioning slot 8. The bottom dimension A2 of the positioning block 3 is clearance-fitted with the dimension A1 of the positioning slot 8 and can slide up and down along the positioning slot 8. The width dimension C of the top boss of the positioning block 3 is smaller than the width dimension B of the blade 2. (See attached diagram) Figure 5 As shown;

[0030] As attached Figure 4 and attached Figure 6As shown, the positioning block 3 is used to press the front end face of each blade 2. The surface of the positioning block 3 that is tangent to the front end face of the blade 2 is the pressing surface P2, and the front end face of the blade 2 is P1. The pressing surface P2 of the positioning block 3 is an inclined surface, and similarly, the front end face P1 of the blade 2 is also an inclined surface. Preferably, the angle β′ between the inclined surface P1 and the vertical plane is 10° to 30°, and the angle β″ between the inclined surface P2 and the vertical plane is 10° to 30°. Specifically, when the angles β′ and β″ are 20°, [the following is a more detailed description of the process]. The effect is better and it is also convenient to install the blade 2. During installation, between the two blades 2, the clamping surface P2 of the positioning block 3 is used to clamp the front end surface P1 of the next blade 2, and the stop surface D of the positioning block 3 is pressed against the rear end surface of the previous blade 2. The positioning block 3 is fixed in the positioning groove 8 by clamping screw 4. When the next blade 2 is clamped longitudinally at the same time, the previous blade 2 is also positioned and stopped longitudinally, ensuring that the blade body of the blade 2 is under compressive stress and the positioning is accurate.

[0031] Preferred options are listed below. Figure 1 As shown, a transverse positioning key 6 is provided in the positioning groove 8 at the end of the tool holder 1. The transverse positioning key 6 is fixedly connected to the tool holder 1 by a fixing screw 7, and is used to position and press the blade 2 in the length direction by cooperating with the positioning pressure block 3. Thus, the accurate positioning and reliable pressing of the blade 2 in the transverse and longitudinal directions are achieved by the mounting groove 10, the positioning pressure block 3 and the pressing screw 5, which improves the stability of the blade 2 and the tool holder 1 during use and extends the service life of the grooving broach.

[0032] As attached Figure 2 and attached Figure 3 As shown, the mounting groove 10 is also provided with threaded holes, which can be distributed on the left and right sides of each positioning groove. A clamping screw 5 is threaded into each threaded hole. The clamping screw 5 passes through the mounting hole on the blade 2 (not shown in the attached drawing) to fix and clamp the blade 2, as shown in the attached drawing. Figure 6 As shown, each blade 2 has at least two mounting holes, and the blade 2 is fixed by two clamping screws 25, which further improves the stability of the blade 2 during the cutting process;

[0033] Each blade 2 has 2 to 12 cutting teeth. Preferably, each blade 2 has 7 cutting teeth, which provides better performance. The width of the cutting teeth is 7mm to 16mm, and the rake angle γ of the cutting teeth is 8° to 12°. The tooth rise SZ of the main cutting edge of the broach is 0.05mm to 0.07mm, which is formed by increasing the height of each tooth. The installation and debugging ensure that the dimensions, geometric tolerances and surface quality requirements of the design drawings are met.

[0034] Each cutting tooth has a chip breaker groove 9 on its flank face along the clearance angle α. These chip breaker grooves 9 are arranged alternately in front-to-back and left-to-right patterns on each cutting tooth of the insert 2, as shown in the attached diagram. Figure 7As shown, this ensures that the blade 2 plays a chip-breaking role during the cutting process, allowing the chips to curl better and be discharged smoothly.

[0035] To solve the chip breaking problem of broach cutting, and to be suitable for broaching wider tenons, the chip breaking groove 9 adopts a V-shaped structure to address the problem of easy tooth breakage of carbide broaches. The included angle θ of the V-shape is 60° to 100°, and the effect is better when the included angle θ is 90°.

[0036] As attached Figure 8 As shown, considering the characteristics of high hardness, brittleness, and easy tooth breakage of cemented carbide materials, the bottom of the chip breaker groove 9 adopts a smooth transition, with a transition radius R1 of R0.3mm to R1mm. Among them, the best performance is achieved when the transition radius R1 is 0.5mm. Furthermore, the two sides of the chip breaker groove 9 smoothly transition to the flank face, with a transition radius R2 of R0.5mm to R1.5mm. Preferably, the transition radius R2 is 0.8mm. The cutting tooth tip smoothly transitions to the flank face and tooth flank, with a transition radius R3 of 0.5mm to R1.5mm. Preferably, the transition radius R3 is 0.8mm. This design is suitable for broaching wider tenons. The entire slotting broach of this invention adopts this structure, which can improve broaching efficiency by increasing the broaching speed.

[0037] In the above embodiments, preferably, as shown in the appendix Figure 9 As shown, the groove depth h of the V-shaped chip breaker groove 9 is 0.3 to 1 mm, and the back angle α is 1°30′ to 3°.

[0038] Compared with the prior art, the assembled carbide grooving broach of the present invention provides a broach product with high efficiency for removing excess material when broaching tenons and grooves of disc-shaped parts, especially difficult-to-machine materials such as powder high-temperature alloys. It is a technological breakthrough in broaching tools for tenons and grooves of disc-shaped parts and can effectively reduce the cost of broaches used in mass production parts.

[0039] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0040] The embodiments described above are merely illustrative of specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An assembled cemented carbide grooving broach, characterized in that, The tool holder (1) and blades (2) are included. The tool holder (1) is made of high-quality structural steel, and the blades (2) are made of cemented carbide. The tool holder (1) has a longitudinally arranged mounting groove (10) for placing multiple blades (2). The two side bases of the blades (2) are positioned in the width direction by cooperating with the mounting groove (10). The mounting groove (10) has multiple transversely arranged positioning grooves (8). A blade (2) is placed between two adjacent positioning grooves (8). A positioning block (3) is installed in the positioning groove (8) to press the front end face of each blade (2). The surface of the positioning block (3) that is tangent to the front end face of the blade (2) is the pressing surface P2. The pressing surface P2 of the positioning block (3) is an inclined surface. The stop surface D of the positioning block (3) is pressed against the rear end face of the previous blade (2). The positioning block (3) is fixed in the positioning groove by a pressing screw (4). 8) Inside; The mounting slot (10) is also provided with a threaded hole, and a clamping screw (5) is threaded into the threaded hole. The clamping screw (5) passes through the mounting hole on the blade (2) to fix and clamp the blade (2); Each blade (2) is provided with several cutting teeth, and each cutting tooth has a chip breaking groove (9) along the back angle α on the back face. The chip breaking groove (9) is arranged alternately on the cutting teeth of each blade (2). The chip breaking groove (9) is a V-shaped structure with a V-shaped included angle θ of 60° to 100°. The bottom of the chip breaking groove (9) is a smooth transition with a transition radius R1 of 0.3mm to 1mm. The two sides of the chip breaking groove (9) are smoothly connected to the back face with a transition radius R2 of 0.5mm to 1.5mm. The tip of the cutting tooth is smoothly connected to the back face and tooth side with a transition radius R3 of 0.5mm to 1.5mm.

2. The assembled cemented carbide grooving broach according to claim 1, characterized in that, The positioning groove (8) at the end of the blade holder (1) is provided with a transverse positioning key (6). The transverse positioning key (6) is fixedly connected to the blade holder (1) by a fixing screw (7) and is used to position and press the blade (2) in the length direction by cooperating with the positioning pressure block (3).

3. The assembled cemented carbide grooving broach according to claim 1, characterized in that, The angle β″ between the inclined surface and the vertical surface of the positioning block (3) is 10° to 30°.

4. The assembled cemented carbide grooving broach according to claim 1, characterized in that, The included angle θ of the V-shaped chip breaking groove (9) is 90°, the groove depth h is 0.3~1mm, and the back angle α is 1°30′~3°.

5. The assembled cemented carbide grooving broach according to claim 1, characterized in that, The rake angle γ of the cutting tool teeth is 8° to 12°.

6. The assembled cemented carbide grooving broach according to claim 5, characterized in that, A tool holder (1) can be equipped with 2 to 6 blades (2), and each blade (2) has 2 to 12 cutting teeth.

7. The assembled cemented carbide grooving broach according to claim 6, characterized in that, The width of the cutting teeth is 7mm to 16mm.

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