Assembled hard alloy slotting broach

Abstract

The invention discloses an assembled hard alloy slotting broach which comprises a tool apron and a blade, and the blade is made of hard alloy. A mounting groove for placing a plurality of blades is formed in the tool apron along the longitudinal direction; a plurality of transversely-arranged positioning grooves are formed in the mounting groove, a blade is placed between every two adjacent positioning grooves, positioning pressing blocks are movably assembled in the positioning grooves, the faces, tangent to the front end faces of the blades, of the positioning pressing blocks are pressing faces P2, the pressing faces P2 of the positioning pressing blocks are inclined faces, and the stop faces D of the positioning pressing blocks abut against the rear end face of the previous blade. Threaded holes are further formed in the two ends in the mounting groove, and second pressing screws used for pressing the blade are connected into the threaded holes in a threaded mode. A plurality of cutting cutter teeth are arranged on each blade, and a chip breaker groove is formed in the rear cutter face of each cutting cutter tooth; the assembly type structure is adopted, the blade is made of hard alloy materials and has higher wear resistance, it is guaranteed that the blade body of the hard alloy blade bears pressure stress through a novel pressing mode, and the service life of the broach is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of aero-engine tool design, in particular to an assembled cemented carbide slotting broach. Background Art

[0002] With the continuous development of aero-engine technology, the materials of disc parts are becoming more and more difficult to process, such as powder high-temperature alloys, high-temperature alloys, etc., but the goal is still efficient cutting. At present, most of the broaches used for high-speed broaching of disc parts are integral or split high-speed steel structures. The cutting performance of high-speed steel materials limits the service life of the broaches and the improvement of broaching efficiency. It is necessary to develop new structures and new materials with better wear resistance. When using highly mature cemented carbide materials, the material price is expensive and the integral structure is not very suitable. Secondly, there are also problems such as poor tensile properties of the material, high brittleness, and easy tooth collapse at sharp corners. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an assembled cemented carbide slotting broach to solve the above problems.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] An assembled carbide slotting broach comprises a tool holder and a blade, wherein the tool holder is made of high-quality structural steel and the blade is made of carbide; a mounting groove for placing a plurality of blades is longitudinally provided on the tool holder, and two side base surfaces of the blade cooperate with the mounting groove for positioning in the width direction; a plurality of transversely arranged positioning grooves are provided on the mounting groove, and a blade is placed between two adjacent positioning grooves, and a positioning block is provided in the positioning groove for pressing the front end surface of each blade, and the surface where the positioning block and the front end surface of the blade meet is the pressing surface P 2. The clamping surface P2 of the positioning block is an inclined surface, and the stop surface D of the positioning block is pressed against the rear end surface of the previous blade. The positioning block is fixed in the positioning groove by a clamping screw 1; a threaded hole is also provided in the mounting groove, and a clamping screw 2 is threadedly connected in the threaded hole. The clamping screw 2 passes through the mounting hole on the blade to fix and clamp the blade; each blade is provided with a plurality of cutting teeth, and a chip breaker groove is provided on the back face of each cutting tooth in the direction of the back angle α, and the chip breaker grooves are staggered on the cutting teeth of each blade in a front-back and left-right manner.

[0006] In the above invention, further, a transverse positioning key is provided in the positioning groove at the end of the knife seat, and the transverse positioning key is fixedly connected to the knife seat by a fixing screw, and is used to position and tighten the blade in the length direction by cooperating with the positioning pressing block.

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

[0008] In the above invention, further, the chip breaker groove is a V-shaped structure, and the V-shaped angle θ is 60° to 100°.

[0009] In the above invention, further, the chip breaker groove of the V-shaped structure has an included angle θ of 90°, a groove depth h of 0.3-1 mm, and a back angle α of 1°30′-3°.

[0010] In the above invention content, further, the bottom of the chip breaker groove is smoothly transitioned, and the groove bottom transition radius R1 is R0.3mm~R1mm; and the two sides of the chip breaker groove are smoothly transitioned with the back tool surface, and the transition radius R2 is R0.5mm~R1.5mm; the cutting tooth tip is smoothly transitioned with the back tool surface and the tooth side, and the transition radius R3 is R0.5mm~R1.5mm.

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

[0012] In the above invention, further, one blade holder can be equipped with 2 to 6 blades, and one blade is provided with 2 to 12 cutting teeth.

[0013] In the above invention, further, the width of the cutting teeth is 7 mm to 16 mm.

[0014] The beneficial effects of the present invention are:

[0015] The advantages of the present invention are that the slotting broach seat and the blade adopt an assembled structure, the blade is made of cemented carbide material, has higher wear resistance, and a new clamping method between the positioning block and the end face of the blade ensures that the cemented carbide blade body is subjected to compressive stress, thereby extending the service life of the broach; secondly, a V-shaped and smoothly transitioned chip breaker groove is provided on each cutting tooth of the blade, which can be suitable for the broaching of wider tenons and grooves. The entire set of slotting broaches of the present invention adopts this material and structure, and can improve the broaching efficiency by increasing the broaching speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a main cross-sectional view of the slotting broach of the present invention;

[0017] Figure 2 It is a front view of the knife holder of the present invention;

[0018] Figure 3 A left side view of the knife holder of the present invention;

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

[0020] Figure 5 A top view of the positioning block of the present invention;

[0021] Figure 6 A front view of a blade according to the present invention;

[0022] Figure 7 A top view of the blade of the present invention;

[0023] Figure 8 Schematic diagram of the chip breaker groove and tooth tip R shape of the blade of the present invention;

[0024] Fig. 9 for Figure 8 Middle AA section view.

[0025] In the figure, 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 breaker groove, 10-installation groove. DETAILED DESCRIPTION

[0026] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0027] Please refer to the attached Figure 1 -Attached Figure 3 As shown, an assembled cemented carbide slotting broach comprises 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 the cemented carbide material is utilized to extend the service life of the slotting broach.

[0028] The upper side of the knife seat 1 is provided with a mounting groove 10 for placing a plurality of blades 2 in the longitudinal direction. The plurality of blades 2 are detachably placed in the mounting groove 10. Preferably, one knife seat 1 can be equipped with 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 groove 10 is provided with a plurality of transversely arranged positioning grooves 8, a blade 2 is placed between two adjacent positioning grooves 8, a positioning block 3 is arranged in the positioning groove 8, wherein the size A2 at the bottom of the positioning block 3 and the size A1 of the positioning groove 8 are clearance matched and can slide up and down along the positioning groove 8, and the width size C of the boss at the top of the positioning block 3 is smaller than the width size B of the blade 2, as shown in the attached 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 surface of each blade 2, the surface of the positioning block 3 that fits the front end surface of the blade 2 is the pressing surface P2, and the front end surface of the blade 2 is P1. The pressing surface P2 of the positioning block 3 is an inclined surface. Similarly, the front end surface P1 of the blade 2 is also an inclined surface. Preferably, the angle β′ between the inclined surface P1 and the vertical surface is 10° to 30°, and the angle β″ between the inclined surface P2 and the vertical surface is 10° to 30°. When the angles β′ and β″ are 20°, use The effect is better and it is also convenient for installing the blade 2; when installing, between the two blades 2, the pressing surface P2 of the positioning pressing block 3 is used to press the front end surface P1 of the next blade 2, and the stop surface D of the positioning pressing block 3 is pressed against the rear end surface of the previous blade 2. The positioning pressing block 3 is fixed in the positioning groove 8 by a pressing screw 4, and when the next blade 2 is pressed longitudinally at the same time, the previous blade 2 is longitudinally positioned and stopped, ensuring that the blade body of the blade 2 is under compressive stress and accurately positioned;

[0031] Preferably, as attached Figure 1 As shown, a transverse positioning key 6 is provided in the positioning groove 8 at the end of the knife seat 1, and the transverse positioning key 6 is fixedly connected to the knife seat 1 through a fixing screw 7, and is used to position and clamp the blade 2 in the length direction through cooperation with the positioning pressing block 3, and then the accurate transverse and longitudinal positioning and reliable clamping of the blade 2 are achieved through the installation groove 10, the positioning pressing block 3 and the clamping screw 2 5, thereby improving the stability of the blade 2 and the knife seat 1 during use and extending the service life of the slotting broach;

[0032] As attached Figure 2 and attached Figure 3 As shown, the mounting groove 10 is further provided with threaded holes, which can be distributed on the left and right sides of each positioning groove, and the threaded holes are threadedly connected with clamping screws 5, which pass through the mounting holes on the blade 2 (not shown in the drawings) to fix and clamp the blade 2. Figure 6 As shown, each blade 2 has at least two mounting holes, and the blade 2 is fixed by two clamping screws 5 to further improve the stability of the blade 2 during the cutting process;

[0033] Each blade 2 is provided with 2 to 12 cutting teeth. Preferably, when each blade 2 is provided with 7 cutting teeth, the use effect is better. The width of the cutting teeth is 7 mm to 16 mm, and the front angle γ of the cutting teeth is 8° to 12°. The tooth lift SZ of the main cutting edge of the broach is 0.05 mm to 0.07 mm, which is formed by the increase in the height dimension of each tooth. The installation and commissioning ensures the size, shape and position tolerance and surface quality requirements of the design drawings.

[0034] A chip breaker groove 9 is provided on the back face of each cutting tooth along the back angle α direction. The chip breaker grooves 9 are arranged on the cutting teeth of each blade 2 in a staggered manner. Figure 7As shown, it can be ensured that the blade 2 plays a chip breaking role during the cutting process, so that the iron chips are better curled and the chips are discharged smoothly.

[0035] In order to solve the problem of chip breaking during broaching, it is suitable for broaching of wider tenons and grooves. Aiming at the problem of easy tooth breakage of cemented carbide broaches, the chip breaker groove 9 adopts a V-shaped structure, and its V-shaped angle θ is 60° to 100°, wherein the effect is better when the angle θ is 90°;

[0036] As attached Figure 8 As shown, in view of the characteristics of high hardness, high brittleness and easy tooth breakage of cemented carbide materials, the bottom of the chip breaker groove 9 adopts a smooth transition, and the groove bottom transition radius R1 is R0.3mm~R1mm, wherein, when the groove bottom transition radius R1 is 0.5mm, the use effect is best; and the two sides of the chip breaker groove 9 are smoothly transitioned with the back tool surface, and the transition radius R2 is R0.5mm~R1.5mm, wherein the transition radius R2 is preferably 0.8mm; the cutting tooth tip is smoothly transitioned with the R back tool surface and the tooth side, and the transition radius R3 is 0.5mm~R1.5mm, wherein the transition radius R3 is preferably 0.8mm, which is suitable for the broaching of wider tenons and mortises. The grooving broach of the present invention adopts this structure as a whole, and the broaching efficiency can be improved by increasing the broaching speed.

[0037] In the above embodiments, preferably, as shown in the attached Fig. 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 for efficiently removing excess for mortise and tenon broaching of disc-type parts, especially powder high-temperature alloy difficult-to-process materials. It is a technological breakthrough in mortise and tenon broaching tools for disc-type parts and can effectively reduce the cost of using broaches for mass-produced parts.

[0039] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0040] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An assembled cemented carbide slotting broach, characterized in that: The invention comprises a knife seat (1) and a blade (2), wherein the knife seat (1) is made of high-quality structural steel, and the blade (2) is made of hard alloy; a mounting groove (10) for accommodating a plurality of blades (2) is provided on the knife seat (1) along the longitudinal direction, and two side base surfaces of the blade (2) cooperate with the mounting groove (10) for positioning in the width direction; a plurality of transversely arranged positioning grooves (8) are provided on the mounting groove (10), and a blade (2) is placed between two adjacent positioning grooves (8); a positioning block (3) is arranged in the positioning groove (8) for pressing the front end surface of each blade (2); the surface where the positioning block (3) and the front end surface of the blade (2) meet is a pressing surface P2, The pressing surface P2 of the positioning pressure block (3) is an inclined surface, the stop surface D of the positioning pressure block (3) is pressed against the rear end surface of the previous blade (2), and the positioning pressure block (3) is fixed in the positioning groove (8) by a first pressing screw (4); a threaded hole is also provided in the mounting groove (10), and a second pressing screw (5) is threadedly connected in the threaded hole, and the second pressing screw (5) passes through the mounting hole on the blade (2) to fix and press the blade (2); each blade (2) is provided with a plurality of cutting teeth, and a chip breaker groove (9) is provided on the rear face of each cutting tooth along the rear angle α direction, and the chip breaker grooves (9) are arranged on the cutting teeth of each blade (2) in a staggered manner in the front, back, left and right directions.

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

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

4. The assembled cemented carbide slotting broach according to claim 1, characterized in that: The chip breaker groove (9) is a V-shaped structure, and the V-shaped angle θ is 60° to 100°.

5. The assembled cemented carbide slotting broach according to claim 4, characterized in that: The chip breaker groove (9) of the V-shaped structure has an included angle θ of 90°, a groove depth h of 0.3-1 mm, and a back angle α of 1°30′-3°.

6. The assembled cemented carbide slotting broach according to claim 1, characterized in that: The bottom of the chip breaker groove (9) is smoothly connected, and the groove bottom connection radius R1 is R0.3mm-R1mm; and the two sides of the chip breaker groove (9) are smoothly connected with the back tool surface, and the connection radius R2 is R0.5mm-R1.5mm; the tooth tip of the cutting tooth is smoothly connected with the back tool surface and the tooth side, and the connection radius R3 is R0.5mm-R1.5mm.

7. The assembled cemented carbide slotting broach according to claim 1, characterized in that: The front angle γ of the cutting teeth is 8° to 12°.

8. The assembled cemented carbide slotting broach according to claim 7, characterized in that: One blade seat (1) can be equipped with 2 to 6 blades (2), and one blade (2) is provided with 2 to 12 cutting teeth.

9. The assembled cemented carbide slotting broach according to claim 8, characterized in that: The width of the cutting teeth is 7 mm to 16 mm.

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