CN219093671U - Three-head combined cutter - Google Patents

Abstract

The utility model relates to the technical field of machine tool cutters, in particular to a three-head combined cutter. Comprises a cutter body, a cutter head, a cutter blade mounting assembly and a cutter blade. The cutter head is arranged at one end of the cutter body, the cutter blade mounting assembly is arranged on the cutter head, and three cutter blades are respectively protruded out of the axial surfaces of the end part of the cutter head and the radial surfaces of the two sides of the end part along different directions and are fixed on the cutter head by the three cutter blade mounting assemblies. According to the three-head combined cutter, the outer circle part of a workpiece is firstly cut by the outer circle turning cutter arranged on the radial side surface of the end part of the cutter head, the cutter is lifted after cutting, the plane part of the workpiece is cut by the axial plane turning cutter at the end part of the cutter head, and finally the inner cavity part of the workpiece is machined by the inner circle turning cutter arranged on the radial side surface of the end part of the cutter head, so that cutter changing operation in the machining process is avoided, and the machining efficiency is improved.

Description

Three-head combined cutter

Technical Field

The utility model relates to the technical field of machine tool cutters, in particular to a three-head combined cutter.

Background

In the machining industry, a blade is installed on a general turning tool, one tool can only finish machining of one set of dimensions in one process, when machining another set of dimensions, the tool needs to be quickly retracted, after the tool rest is far away from a workpiece, the tool rest is turned to another turning tool position, and then turning is performed. On the other hand, the common lathe tool only uses the acute angle of the blade, and the obtuse angle cannot be used, so that the blade cannot be fully utilized, the utilization rate of the blade is greatly reduced, and the cost of the cutter is also greatly increased.

At present, a combined tool is also known, which is a special tool with more than two working parts combined on one tool body for simultaneously or sequentially processing more than two surfaces or completing a plurality of processing procedures on one surface. The combined cutter has the advantages of high productivity, easy assurance of the relative position precision between the processing surfaces of the workpiece, such as the coaxiality of the holes, the perpendicularity of the holes and the end face, and the like, and is suitable for batch and mass production.

Because of the processing characteristics of the combined cutter, the cutter heads with specific angles are required to be arranged on the combined cutter for the processed surfaces of different workpiece models, and the processing technology of the workpiece is correspondingly adjusted.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present utility model is directed to a three-head combined tool for solving the problems of frequent tool changing and low production efficiency in the process of machining the outer circumferential surface, the inner circumferential surface and the end surface of a rotary workpiece in the prior art.

The utility model provides a three-head combined cutter which comprises a cutter body, a cutter head, a cutter blade mounting assembly and a cutter blade. The cutter head is arranged at one end of the cutter body, the cutter blade mounting assembly is arranged on the cutter head, and the three cutter blades are respectively protruded out of the surface of the end part of the cutter head along different directions and are fixed on the cutter head by the three cutter blade mounting assemblies.

In an embodiment of the present utility model, the cutter head is provided with a blade mounting surface, the blade mounting surface is parallel to the axis of the cutter body, and three blade mounting surfaces are adjacently disposed along the radial direction of the cutter body, and the three blade mounting components are respectively and fixedly mounted on the three blade mounting surfaces, so that the three blades protrude from the surface of the end portion of the cutter head along the first direction, the second direction and the third direction.

In an embodiment of the present utility model, one blade mounting groove is respectively disposed on three blade mounting surfaces, the three blade mounting grooves are respectively disposed on edges of the three blade mounting surfaces facing the first direction, the second direction and the third direction, and bottom surfaces of the blade mounting grooves are parallel to the blade mounting surfaces.

In one embodiment of the present utility model, the three blades are respectively:

a first blade disposed in the blade mounting groove of the tool bit in the first direction;

a second blade provided in the blade mounting groove of the cutter head in the second direction; and

and a third blade disposed in the blade mounting groove of the cutter head in the third direction.

In an embodiment of the present utility model, the first direction is along an axial direction of the cutter body, the second direction is along a direction forming an angle of 45 ° to 135 ° with the axial direction of the cutter body, and the third direction is along a direction forming an angle of-45 ° to-135 ° with the axial direction of the cutter body, and is disposed at the other side of the axial direction of the cutter body, opposite to the second direction; the cutting direction of the first blade is parallel to the radial direction of the cutter body, and the cutting directions of the second blade and the third blade are parallel to the axial direction of the cutter body.

In one embodiment of the present utility model, the blade mounting assembly comprises:

a shim placed on the bottom surface of the blade mounting groove;

a pressing plate placed on the blade mounting surface; and

a press plate screw mounted in the press plate and connected to the insert mounting surface in a screw hole;

the three blades are respectively arranged on the cutter pads in the three blade mounting grooves, supported by the corresponding pressing plates and locked between the cutter pads and the pressing plates by the pressing plate screws.

In an embodiment of the present utility model, the pressing plate is provided with an inverted "concave" structure, and protrusions at two ends of the "concave" structure of the pressing plate respectively abut against the blade mounting surface and the blade.

In an embodiment of the present utility model, a key-type through groove is formed in the middle of the upper end of the pressing plate, the length direction of the key-type through groove is parallel to the connection line of the protrusions at the two ends of the concave shape of the pressing plate, and the width of the key-type through groove is larger than the diameter of the screw rod of the pressing plate screw and smaller than the diameter of the screw head of the pressing plate screw.

In an embodiment of the present utility model, the middle part of the blade is provided with a through hole, the middle part of the blade pad is provided with a middle hole, the middle hole is aligned with and communicated with the through hole, and the blade mounting assembly further comprises a pressing column arranged in the blade mounting groove; the pressing column penetrates through the through hole and the middle hole, and two ends of the pressing column respectively extend into the positioning holes of the blade mounting groove and abut against the protruding ends of the pressing plate.

In one embodiment of the present utility model, the protrusions at both ends of the "concave" structure of the pressing plate are located at one side of the blade mounting groove, and the protrusions at one end of the "concave" structure of the pressing plate are in contact with the blade and the top end of the pressing post.

In an embodiment of the present utility model, the first blade is a turning plane blade, and the second blade and the third blade are an turning outer circle blade and an turning inner circle blade respectively.

In an embodiment of the present utility model, the first blade and the second blade cut at an obtuse angle of a C-shaped blade, and the second blade cuts at a T-shaped blade.

The utility model has the beneficial effects that: when in machining, the three-head combined cutter firstly cuts and processes the outer circle part of the workpiece through the outer circle turning cutter arranged on the radial side surface of the end part of the cutter head, the cutter is lifted after the cutting is completed, then the axial plane turning cutter at the end part of the cutter head is used for cutting and processing the plane part of the workpiece, finally the inner cavity part of the workpiece is processed through the inner circle turning cutter on the radial side surface of the end part of the cutter head, and then the cutter changing operation in the machining process is avoided, so that the machining efficiency is improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:

FIG. 1 is a schematic view of a three-head combination tool of the present application in a three-dimensional configuration;

FIG. 2 is a schematic perspective view of the present application with the blade and blade mounting assembly removed;

FIG. 3 is a partial perspective view of a bit portion of the three-head combination tool of the present application;

FIG. 4 is a perspective exploded view of the three-head combination tool of the present application;

FIG. 5 is an enlarged partial schematic view at A in FIG. 4;

FIG. 6 is a schematic drawing of the machining of the three-head combination tool of the present application when the turning tool is used;

FIG. 7 is a schematic drawing of the machining of the three-head combination tool of the present application with a turning flat tool;

fig. 8 is a schematic processing diagram of the three-head combination tool of the present application when the inner cutter is turned.

In the figure: 1. a cutter body; 2. a cutter head; 20. a blade; 200. a through hole; 201. pressing a column; 21. a first blade; 22. a second blade; 23. a third blade; 3. a blade mounting surface; 300. a screw hole; 31. a blade mounting groove; 311. positioning holes; 4. a blade mounting assembly; 41. a knife pad; 410. a middle hole; 42. a pressing plate; 420. a protrusion; 421. a key-type through groove; 43. and (5) pressing a plate screw.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. It is also to be understood that the terminology used in the examples of the utility model is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the utility model. The test methods in the following examples, in which specific conditions are not noted, are generally conducted under conventional conditions or under conditions recommended by the respective manufacturers.

Please refer to fig. 1 to 8. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the utility model, are not intended to be critical to the essential characteristics of the utility model, but are intended to fall within the spirit and scope of the utility model. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced.

Referring to fig. 1, the three-head combined tool provided by the utility model comprises a tool body 1, a tool bit 2, a blade mounting assembly 4 and a blade 20. The tool bit 2 is arranged at one end of the tool body 1, and the blade mounting assembly 4 is arranged on the tool bit 2. The three blades 20 protrude from the surface of the end portion of the cutter head 2 in different directions, respectively, and are fixed to the cutter head 2 by the three blade mounting assemblies 4.

In this embodiment, three blades 20 are secured to the tool bit 2 by the blade mount assembly 4 according to the shape of the surface of the workpiece to be machined and the sequence of machining processes. The tool body 1 is driven to move by a machine tool in the machining process, so that the three blades 20 are sequentially moved to the surface to be machined of the workpiece. By means of the three blades 20 being arranged in the axial direction of the end part of the tool bit 2 and in the radial direction of the two sides of the end part, the three blades 20 are respectively positioned on three surfaces to be machined of a workpiece only by moving the tool body 1 during machining. For example, three blades 20 are respectively selected to be provided with an outer turning blade, a plane turning blade and an inner turning blade for processing the outer circumferential surface, the inner circumferential surface and the end surface of the rotary workpiece.

Referring to fig. 2-3, the cutter head 2 is provided with a blade mounting surface 3, the blade mounting surface 3 is parallel to the axis of the cutter body 1, and three blade mounting surfaces 3 are adjacently disposed along the radial direction of the cutter body 1, and three blade mounting assemblies 4 are fixedly mounted on the three blade mounting surfaces 3, respectively, so that three blades 20 protrude from the surface of the end portion of the cutter head 2 along the first direction, the second direction, and the third direction, respectively.

In the cutting process of the blade 20, various process angles, such as a rake angle, a relief angle, a main deflection angle, a secondary deflection angle, an edge inclination angle and the like, are required to be considered between the blade 20 and the surface to be processed of the workpiece according to the process and the use requirement of the tool. The three blades 20 are processed by utilizing the blade mounting surfaces 3 arranged on the cutter head 2, selecting the angle of the blade mounting surfaces 3 arranged on the cutter head 2 according to the technological angle requirement of the processing mode, and correspondingly fixing the three blade mounting components 4 on the three blade mounting surfaces 3 so as to meet the technological requirement of the required blade 20 included angle.

It should be noted that the three blade mounting surfaces 3 may be disposed coplanar at the end of the insert 2, or three different planes may be employed as the blade mounting surfaces 3 as shown in fig. 2. According to the characteristics of the surface to be machined of the workpiece, the angles between the three blade mounting surfaces 3 can be set by themselves so as to meet the process requirements of machining the blade 20, and details are omitted herein.

Referring to fig. 4 to 5, one blade mounting surface 3 is provided with three blade mounting grooves 31, and the three blade mounting grooves 31 are provided at edges of the three blade mounting surfaces 3 along the first direction, the second direction and the third direction, respectively, and a bottom surface of each blade mounting groove 31 is parallel to the corresponding blade mounting surface 3.

The blade mounting assemblies 4 are partially arranged on the corresponding blade mounting surfaces 3 to limit the fixed blades 20, partially arranged in the corresponding blade mounting grooves 31, and matched with the blade mounting grooves 31 to enable the blades 20 to be placed in the blade mounting grooves 31 and abut against the groove walls, and the blade mounting assemblies 4 and the blade mounting grooves 31 are utilized to limit any degree of freedom of the blades 20.

Also, according to the processing requirements of the blade 20, based on the three blade mounting surfaces 3, blade mounting grooves 31 with different depths can be provided to control the height difference of the blade 20 at the end of the cutter head 2.

Referring to fig. 1-2, the three blades 20 are a first blade 21, a second blade 22 and a third blade 23, respectively, wherein the first blade 21 is disposed in a blade mounting groove 31 of the cutter head 2 along a first direction; the second blade 22 is disposed in the blade mounting groove 31 of the cutter head 2 in the second direction; the third blade 23 is disposed in the blade mounting groove 31 of the cutter head 2 in the third direction.

In the present embodiment, the first blade 21, the second blade 22 and the third blade 23 may employ a turning plane blade, an turning outer circle blade and a turning inner circle blade, respectively, for processing the outer circle surface, the inner circle surface and the end surface of the rotary workpiece. Meanwhile, the first blade 21 and the second blade 22 may cut at an obtuse angle of the C-shaped blade 20, and the second blade 22 may cut at a T-shaped blade 20, thereby utilizing the obtuse angle of the blades 20. Also, for example, a drill, a reamer and a reamer combination may be used as the first blade 21, the second blade 22 and the third blade 23, respectively, and the hole forming processing of the workpiece on the machine tool may be achieved by adjusting the posture of the cutter body 1.

Referring to fig. 6-8, the first direction is along the axial direction of the cutter body 1, the second direction is along the direction forming an included angle of 45 ° to 135 ° with the axial direction of the cutter body 1, and the third direction is along the axial direction of the cutter body 1 forming an included angle of-45 ° to-135 ° and is opposite to the second direction on the other side of the axial direction of the cutter body 1. The cutting direction of the first blade 21 is parallel to the radial direction of the blade body 1, and the cutting directions of the second blade 22 and the third blade 23 are parallel to the axial direction of the blade body 1.

The three blades 20 on the cutter head 2 are arranged in a first direction, a second direction and a third direction, respectively. In order to meet the processing requirements of the combined cutter on different processing surfaces of the workpiece, according to the process sequence that each blade 20 is sequentially contacted with the surface to be processed of the workpiece in the processing process, the distribution condition of the surface to be processed on the workpiece such as the relationship of azimuth distance and the possible interference condition of each blade 20 in the processing process, the distribution positions of the first direction, the second direction and the third direction on the cutter head 2 and the range of included angles between the first direction, the second direction and the third direction are correspondingly adjusted, so that the three blades 20 on the combined cutter with three heads meet the effect of sequentially turning the surface to be processed of the workpiece.

Description of the angular relationship between the first, second and third directions of the three blades 20 on the head 2: namely, the first direction is along the axial direction of the cutter body 1, the second direction is along the direction forming an included angle of 45-135 degrees with the axial direction of the cutter body 1, the third direction is along the axial direction of the cutter body 1 forming an included angle of-45-135 degrees, and the third direction is arranged at the other side of the axial direction of the cutter body 1 relative to the second direction. The limitation of the range of the included angles among the first direction, the second direction and the third direction is a sufficient unnecessary condition for realizing the machining effect of the three-head combined tool on the tool bit 2 by the three blades 20. For example, the first direction may be parallel to the axial direction of the cutter body 1, and the first direction, the second direction, and the third direction may be deflected synchronously, so that the three blades 20 may satisfy the machining effect of the three-head combined cutter.

Referring to fig. 4-5, the blade mounting assembly 4 includes:

a shim 41 placed on the bottom surface of the insert mounting groove 31;

a pressing plate 42 placed on the blade mounting surface 3; and

a platen screw 43 mounted in the platen 42 and connected to the screw hole 300 of the blade mounting surface 3;

the three blades 20 are respectively provided on the pads 41 in the three blade mounting grooves 31, supported by the corresponding pressing plates 42, and locked between the pads 41 and the pressing plates 42 by the pressing plate screws 43.

In the present embodiment, the insert 41 is placed on the bottom surface of the insert mounting groove 31 below the insert 20, and the pressing plate 42 applies a force to the insert 20 by screwing the pressing plate screw 43 fixed to the insert mounting surface 3, so that the insert 41 and the insert 20 are tightly fitted to process the workpiece. In the process of assembling and disassembling the blades 20, the heights of the cutter pads 41 can be selected according to the thickness differences of different blades 20, so that the blades 20 are limited between the cutter pads 41 and the pressing plates 42 to be fixed, and the height differences among the three blades 20 are further adjusted by matching with the height differences of the bottom surfaces of the three blade mounting grooves 31.

Referring to fig. 4-5, the pressing plate 42 is provided in an inverted "concave" structure, and protrusions 420 at both ends of the "concave" structure of the pressing plate 42 respectively abut against the blade mounting surface 3 and the blade 20.

When the pressing plate 42 fixes the blade 20, the pressing screw 43 transmits the locking force, and the end parts of the protrusions 420 provided on the pressing plate 42 and facing the blade mounting surface 3 and the blade 20 respectively form a lever locking structure between the blade 20 and the blade mounting surface 3, where the pressing screw 43 contacts the protrusions 420 at both ends of the pressing plate 42. Compared with the flat bottom surface of the pressing plate 42, when there is a height difference between the top end of the blade 20 and the blade mounting surface 3, the locking force transmitted to the pressing plate 42 by the pressing plate screw 43 cannot be effectively applied to the blade 20 and the blade mounting surface 3, and the fixing effect of the blade 20 is further affected.

Referring to fig. 5, a key-shaped through groove 421 is provided in the middle of the upper end of the pressing plate 42, the length direction of the key-shaped through groove 421 is parallel to the line connecting the two protrusions of the concave-shaped end of the pressing plate 42, and the width of the key-shaped through groove 421 is larger than the screw diameter of the pressing plate screw 43 and smaller than the screw head diameter of the pressing plate screw 43.

In the present embodiment, the insert 20 used differs in the projection surface on the bottom surface of the insert mounting recess 31 according to the model thereof. The pressing plate 42 is pressed against the end of the blade 20, and is held on the one hand in the central area of the contact surface of the blade 20, and on the other hand, the projection surface of the end of the pressing plate 42 is located in the bottom surface area of the blade mounting groove 31, so as to ensure the fixing effect of the clamping blade 20. The key through groove 421 formed on the pressing plate 42 is used for adjusting the abutting position of the end of the pressing plate 42 on the blade 20 and the blade mounting surface 3 when the locking position of the pressing plate screw 43 on the blade mounting surface 3 is fixed, so as to meet the locking requirement of the blade 20.

Referring to fig. 2 and 5, the middle part of the blade 20 is provided with a through hole 200, the middle part of the blade pad 41 is provided with a middle hole 410, the middle hole 410 is aligned with and communicated with the through hole 200, and the blade mounting assembly 4 further comprises a pressing column 201 arranged in the blade mounting groove 31; the press post 201 penetrates through the through-hole 200 and the middle hole 410, and both ends of the press post 201 respectively extend into the positioning hole 311 of the blade mounting groove 31 and abut against the protruding 420 end of the press plate 42.

The protrusions 420 at both ends of the "concave" structure of the pressing plate 42 are located at one side of the blade mounting groove 31, and the protrusions 420 at one end of the "concave" structure of the pressing plate 42 are in contact with the blade 20 and the top end of the pressing post 201.

During machining of the insert 20, the cutting forces generate a turning force parallel to the bottom surface of the insert mounting recess 31, and the side surfaces of the insert 20 abut against the recess walls of the insert mounting recess 31, thereby causing the insert 20 to displace parallel to the bottom surface of the insert mounting recess 31. Through the through hole 200 provided in the blade 20, the pressing post 201 penetrating therethrough is fitted, so that the displacement of the blade 20 parallel to the bottom surface of the blade mounting groove 31 is limited by the pressing post 201. The displacement of the blade 20 in the axial direction of the press stud 201 is limited by the protrusion 420 of the press plate 42, thereby ensuring the stability of the blade 20 during the machining process.

In summary, according to the three-head combined cutter, the outer circle part of the workpiece is firstly cut by the outer circle turning cutter arranged on the radial side surface of the end part of the cutter head 2, the cutter is lifted after cutting, the plane part of the workpiece is cut by the axial plane turning cutter at the end part of the cutter head 2, and finally the inner cavity part of the workpiece is finished by the inner circle turning cutter at the radial side surface of the end part of the cutter head 2, so that the cutter changing operation in the machining process is avoided, and the machining efficiency is improved. Therefore, the utility model effectively overcomes the defects of long tool changing time and insufficient utilization rate of the blade 20 in the prior art, and has industrial utilization value.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (10)

1. A three-head combination tool, comprising:

a cutter body (1);

a cutter head (2) arranged at one end of the cutter body (1);

a blade mounting assembly (4) provided on the cutter head (2); and

the three blades (20) are arranged on the cutter head (2), and the three blades (20) respectively protrude out of the surface of the end part of the cutter head (2) along different directions and are fixed on the cutter head (2) by the three blade mounting assemblies (4).

2. The three-head combined tool according to claim 1, wherein the tool bit (2) is provided with a blade mounting surface (3), the blade mounting surface (3) is parallel to the axis of the tool body (1), and three blade mounting surfaces (3) are adjacently arranged along the radial direction of the tool body (1), and three blade mounting assemblies (4) are fixedly mounted on the three blade mounting surfaces (3) respectively, so that three blades (20) protrude from the surface of the end portion of the tool bit (2) along the first direction, the second direction and the third direction respectively.

3. The three-head combination tool according to claim 2, wherein one insert mounting groove (31) is provided on each of the three insert mounting surfaces (3), the three insert mounting grooves (31) are provided on edges of each of the three insert mounting surfaces (3) facing the first direction, the second direction, and the third direction, and a bottom surface of the insert mounting groove (31) is parallel to the insert mounting surface (3).

4. A three-head combined tool according to claim 3, characterized in that the three blades (20) are respectively:

a first blade (21) provided in the blade mounting groove (31) of the tool bit (2) in the first direction;

a second blade (22) provided in the blade mounting groove (31) of the cutter head (2) in the second direction; and

and a third blade (23) provided in the blade mounting groove (31) of the cutter head (2) in the third direction.

5. The three-head combination tool according to claim 4, wherein the first direction is along an axial direction of the tool body (1), the second direction is along a direction forming an angle of 45 ° to 135 ° with the axial direction of the tool body (1), and the third direction is along an axial direction of the tool body (1) forming an angle of-45 ° to-135 ° and is provided on the other side of the axis of the tool body (1) with respect to the second direction; the cutting direction of the first blade (21) is parallel to the radial direction of the blade body (1), and the cutting directions of the second blade (22) and the third blade (23) are parallel to the axial direction of the blade body (1).

6. The three-head combination tool according to any one of claims 3-5, wherein the blade mounting assembly (4) comprises:

a shim (41) placed on the bottom surface of the insert mounting groove (31);

a pressing plate (42) placed on the blade mounting surface (3); and

a platen screw (43) mounted in the platen (42) and connected to a screw hole (300) of the blade mounting surface (3);

the three blades (20) are respectively arranged on the cutter pads (41) in the three blade mounting grooves (31), supported by the corresponding pressing plates (42), and locked between the cutter pads (41) and the pressing plates (42) by the pressing plate screws (43).

7. The three-head combined tool according to claim 6, wherein the pressing plate (42) is provided in an inverted 'concave' structure, and protrusions (420) at two ends of the 'concave' structure of the pressing plate (42) respectively abut against the blade mounting surface (3) and the blade (20).

8. The three-head combined tool according to claim 7, wherein a key-shaped through groove (421) is formed in the middle of the upper end of the pressing plate (42), the length direction of the key-shaped through groove (421) is parallel to the connection line of the protrusions of the two concave ends of the pressing plate (42), and the width of the key-shaped through groove (421) is larger than the screw diameter of the pressing plate screw (43) and smaller than the screw head diameter of the pressing plate screw (43).

9. The three-head combination tool according to claim 7, wherein a through hole (200) is provided in the middle of the insert (20), a middle hole (410) is provided in the middle of the insert pad (41), the middle hole (410) is aligned with and communicates with the through hole (200), and the insert mounting assembly (4) further comprises a press stud (201) provided in the insert mounting groove (31); the pressing column (201) penetrates through the through hole (200) and the middle hole (410), and two ends of the pressing column (201) respectively extend into the positioning hole (311) of the blade mounting groove (31) and abut against the protruding (420) end of the pressing plate (42).

10. The three-head combination tool according to claim 9, wherein the protrusions (420) at both ends of the pressing plate (42) are located at one side of the blade mounting groove (31), while the protrusions (420) at one end of the pressing plate (42) are in contact with the blade (20) and the tip of the pressing post (201).

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