Split type module drill

Abstract

The utility model provides a split type module drill, which relates to the technical field of drill bits, and comprises a head module, a cutter bar module, indexable blades and S drill blades, the head module is provided with a chip pocket, a center drill positioning installation structure and a plurality of indexable blade slots, the indexable blade slots are used for installing at least two groups of symmetrically arranged indexable blades, and the S drill blades are arranged in the center drill positioning installation structure. The center drill positioning and mounting structure is used for being matched with an S drill blade to achieve positioning and mounting of the S drill blade, the chip containing groove comprises a forming groove and a chip discharging groove, and a butt joint structure is arranged on the cutter bar module and used for achieving positioning and butt joint of the head module and the cutter bar module. The machining efficiency of a hole with the diameter depth being more than 26 mm and the diameter depth being 5 times that of 26 mm can be greatly improved, the service life can be prolonged, the shape of scrap iron can be controlled to improve the chip removal effect, the roughness of the hole wall is reduced, and the machining precision is guaranteed through the arrangement of the forming groove and the chip removal groove.

Description

Technical Field

[0001] The utility model relates to the technical field of drills, in particular to a split-type modular drill. Background Art

[0002] At present, for processing holes with a diameter of more than 25 mm and a depth of 8 times the diameter, a U-drill with a center positioning drill is generally used for processing. Due to the limitations of the material and structure of the center positioning drill, the service life of this kind of drill is short, the drilling efficiency is low, the chip evacuation is not smooth and easy to get stuck, and at the same time, it will reduce the hole wall roughness and affect the drilling accuracy. In view of the above defects, this application is proposed. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a split-type modular drill, which improves the service life, drilling efficiency, controls the chip shape to improve chip evacuation, hole wall roughness and machining accuracy through the reasonable combination of indexable inserts and S-drill inserts.

[0004] To solve the above problems, the utility model provides a split-type modular drill, which includes a head module, a tool shank module, indexable inserts and S-drill inserts. The head module is provided with a chip pocket, a center drill positioning and installation structure and an indexable insert groove. A plurality of indexable insert grooves are provided for installing at least two groups of symmetrically arranged indexable inserts. The center drill positioning and installation structure is used to cooperate with the S-drill insert to realize the positioning and installation of the S-drill insert. The chip pocket includes a forming groove and a chip evacuation groove. The tool shank module is provided with a docking structure, and the docking structure is used to realize the positioning and docking of the head module and the tool shank module.

[0005] According to an embodiment of the utility model, the center drill positioning and installation structure includes a blade center positioning hole and a positioning groove, and the positioning groove coincides with the shape of the S-drill insert and has an anti-rotation effect.

[0006] The bottom of the S-drill insert is a cylindrical positioning pin for inserting into the blade center positioning hole to realize center positioning. The side wall shape of the S-drill insert is set as a V shape, and the corresponding positioning groove is set as a concave V-shaped positioning groove.

[0007] Preferably, 2 to 4 groups of indexable inserts are provided.

[0008] According to an embodiment of the utility model, the docking structure includes a positioning hole provided on the tool shank module, and a positioning post is provided on the head module. The positioning post is inserted into the positioning hole to realize the positioning assembly of the head module and the tool shank module.

[0009] According to an embodiment of the utility model, the head module and the tool shank module are connected by locking screws.

[0010] According to an embodiment of the utility model, a locking inclined surface is provided on the positioning column, and when the locking screw is screwed into the locking inclined surface, a downward pulling force is generated due to the structural effect of the inclined surface.

[0011] Preferably, the inclination angle of the locking slope is 45-60°.

[0012] According to an embodiment of the utility model, the docking structure further includes a rotation-stopping structure, and the rotation-stopping structure includes a fan-shaped boss arranged on the tool rod module, and a fan-shaped groove is arranged on the head module.

[0013] According to one embodiment of the utility model, the locking bevel has a locking bevel angle. Optionally, the locking bevel angle is 1 to 10 degrees. The locking bevel angle is used to enable the head module to automatically fit the side anti-rotation surface of the fan-shaped boss after assembly, thereby eliminating gaps and suppressing vibrations.

[0014] In this embodiment, the fan-shaped bosses and fan-shaped grooves are provided in two groups and are symmetrically arranged.

[0015] According to an embodiment of the present invention, a guide strip is installed on the head module.

[0016] The guide bar plays a supporting and stabilizing role, which is beneficial to improving the drilling quality and increasing the radial support points.

[0017] According to one embodiment of the utility model, a cooling module is provided in the split modular drill, and the cooling module includes a central cooling channel, a central cooling hole and an outer cooling hole. The central cooling channel is provided in the tool rod module, and the central cooling hole and the outer cooling hole are provided on the head module, and the central cooling hole and the outer cooling hole are connected to the central cooling channel.

[0018] According to an embodiment of the utility model, the indexable insert and the S-drill insert are both fixed by screws, which is convenient for installation and disassembly.

[0019] The beneficial effect of the utility model is that the center positioning drill is modularly designed. Since the carbide S drill blade has the same excellent drilling performance as the whole carbide, the indexable blade adopts a symmetrical two-edge combination design, which can greatly improve the hole processing efficiency of 5 times the diameter depth above 26 mm, and the reasonable combination of the indexable blade and the S drill blade is conducive to improving the service life. In addition, through the setting of the forming groove and the chip removal groove, the shape of the iron chips can be controlled to improve the chip removal effect, reduce the roughness of the hole wall, and ensure the processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] Figure 1Schematic diagram of the overall structure of the split modular drill

[0022] Figure 2 is Figure 1 the top view of

[0023] Figure 3 is Figure 1 the schematic diagram of the structure at A-A in

[0024] Figure 4 Schematic diagram of the sectional structure of the split modular drill

[0025] Figure 5 is Figure 4 the enlarged schematic diagram of the structure at P in

[0026] Figure 6 is Figure 4 the schematic diagram of the structure at B-B in

[0027] Figure 7 Schematic diagram of the structure of the blade center positioning hole and the positioning groove in the head module

[0028] Figure 8 Schematic diagram of the exploded structure of the split modular drill

[0029] Figure 9 Schematic diagram of the structure of the central cooling channel, the transverse cooling channel and the chip fluting

[0030] Figure 10 Bottom view of the head module

[0031] Figure 11 Schematic diagram of the structure of the S-drill blade and the positioning groove Detailed implementation manners

[0032] The following description is only used to disclose the present invention so that those skilled in the art can implement the present invention. The embodiments described below are only examples, and other obvious deformations can be thought of by those skilled in the art. The basic principles defined in the following description can be applied to other implementation manners, deformation schemes, improvement schemes, equivalent schemes and other schemes that do not depart from the spirit and scope of the present invention.

[0033]

Embodiment 1

[0034] A split modular drill, as shown in Figure 1 , includes a head module 10, a shank module 20, an indexable insert 13 and an S-drill blade 14.

[0035] The head module 10 is provided with a chip groove, a blade center positioning hole 3, a positioning groove 4 and an indexable blade groove 5. A plurality of indexable blade grooves 5 are provided for installing at least two groups of indexable blades 13. Generally, 2 to 4 groups of indexable blades 13 are provided. The number of blade installations can be adaptively adjusted according to specific needs. The blade center positioning hole 3 and the positioning groove 4 are used to cooperate with the S drill blade 14. The positioning groove 4 matches the shape of the S drill blade 14 to achieve the positioning installation of the S drill blade 14. Specifically, Figure 11 As shown, the bottom of the S drill blade 14 is a cylindrical locating pin, which is used to insert into the blade center locating hole 3 to achieve center positioning. The side wall shape of the S drill blade 14 is set to be V-shaped, and the corresponding locating groove 4 is set to be a concave V-shaped locating groove to achieve further positioning and stabilization of the blade. The indexable blade 13 and the S drill blade 14 are both easy to disassemble and replace. In this embodiment, the S drill blade 14 is fixed by the S drill blade locking screw 7, and the indexable blade 13 is fixed by the indexable blade locking screw 6.

[0036] The S drill blade 14 is generally made of cemented carbide.

[0037] The chip groove adopts a two-stage design, including the forming groove 1 in the front section and the chip groove 2 in the back section. The chip groove 2 is connected to the chip groove of the tool bar module. The small space of the forming groove 1 constrains the chips, causing a large plastic deformation during the chip forming process. Its hardness will increase, while the plasticity and toughness will be significantly reduced. This phenomenon is called cold work hardening. After cooling and hardening, the chips become hard and brittle, and they are easy to break when subjected to alternating bending or impact loads; the chip groove 2 has a large chip space, and the chips in the center area become smaller in volume after breaking, so the chip removal is good and the chip removal is smoother. Figure 9 By setting the forming groove 1 and the chip groove 2, the shape of the iron chips is controlled to improve chip removal, so as to achieve smooth chip removal and prevent chip jamming, thereby improving the processing accuracy.

[0038] The tool bar module 20 is provided with a blade back 11, a blade band 12 and a docking structure, and the docking structure is used to realize the positioning docking of the head module 10 and the tool bar module 20. After the tool bar module 20 and the head module 10 are positioned and docked through the docking structure, a center positioning drill is formed.

[0039] Specifically, the docking structure includes a positioning hole 25 provided on the tool bar module 20 , and a positioning column 16 is provided on the head module 10 . The positioning column 16 is inserted into the positioning hole 25 to realize the positioning and assembly of the head module 10 and the tool bar module 20 .

[0040] like Figure 8, the positioning post 16 is a cylinder, the positioning hole 25 is arranged at the end face 23 of the tool bar module 20. After the positioning post 16 is inserted into the positioning hole 25, central positioning is achieved. Further, the docking structure further includes an anti-rotation structure. The anti-rotation structure includes a sector-shaped boss 17 arranged on the tool bar module 20, and a sector-shaped groove 18 is arranged on the head module 10. Two groups of sector-shaped bosses 17 and sector-shaped grooves 18 are symmetrically arranged for anti-rotation, as Figure 3 , the sector-shaped boss 17 has a positioning sector angle 21. The V1 angle of the positioning sector angle 21 can be selected from 30 to 70°. The function of the positioning sector angle 21 is to form a suitable driving, stress-bearing, and anti-rotation surface 22 on both sides of the sector-shaped boss 17. Optionally, in other embodiments, bosses of other shapes, such as polygons, can also be used to achieve the anti-rotation effect.

[0041] The head module 10 and the tool bar module 20 can be connected by means of clamping, screw connection, etc. In this embodiment, the head module 10 and the tool bar module 20 are connected by a locking screw 29. Specifically, as Figure 4 、 Figure 5 , a locking inclined surface 19 is arranged on the positioning post 16. When the locking screw 29 is screwed into the locking inclined surface 19, a downward pulling force will be generated due to the structural effect of the inclined surface, so that the connection between the head module 10 and the tool bar module 20 is more tightly and reliably. Preferably, the locking inclined surface 19 has a locking inclined surface deflection angle 27. The locking inclined surface deflection angle 27 is used to make the head module 10 automatically fit the driving, stress-bearing, and anti-rotation surface 22 after assembly, eliminate gaps and suppress vibrations. The angle of the locking inclined surface deflection angle 27 is 1 to 10°, and the inclination angle of the locking inclined surface 19 is 45 to 60°.

[0042] Preferably, as Figure 8 、 Figure 9 , two guide bars 15 are symmetrically installed on the head module 10. The guide bars 15 are fixed by guide bar locking screws 24. The guide bars 15 play a role in supporting and stabilizing, which is beneficial to improving the drilling quality and increasing the radial support points.

[0043] Further, a cooling module is also provided in this solution, as Figure 2 、 Figure 9 , including a central cooling channel 8, an outer cooling hole 9, and a transverse cooling channel 26. The central cooling channel 8 extends from the tool bar module 20 into the head module 10 to form a central cooling hole. The transverse cooling channel 26 is arranged in the tool bar module 20. The outer cooling hole 9 is connected to the central cooling channel 8 through the transverse cooling channel 26. The cooling method is to introduce water from the rear end center of the tool bar module 20. The water outlet is at the outer circumference of the head module 10 and is discharged through the central cooling hole and the outer cooling hole 9. Generally, 2 to 4 central cooling holes and outer cooling holes 9 are respectively arranged.

[0044] The steps of drilling a hole using this drill bit are as follows: The cemented carbide S drill blade 14 is responsible for centering. After machining a hole with a diameter of 1 / 2 of the required hole size, the two indexable inserts 13 on both sides are used to enlarge the hole to complete the hole machining.

[0045] Since the price of a solid carbide drill bit with a large diameter is very expensive, the combination of indexable inserts and S drill blades can achieve the same processing efficiency, and the processing cost per hole can be reduced. The reason is that the indexable inserts and S drill blades are small in size and cheap in price, and are made of cemented carbide, so the cutting parameters for machining remain unchanged; at the same time, because the indexable inserts can be indexed, they have 4 cutting edges that can be switched. The central S drill blade has a small diameter and a low cutting speed, so it wears slowly.

[0046] Therefore, since the cemented carbide S drill blade 14 has excellent drilling performance similar to that of solid carbide, the indexable insert 13 with a symmetric two-edge combination design can greatly improve the hole machining efficiency for holes with a depth of more than 26 mm and a 5-fold diameter. The modular design can also reduce the tool usage cost.

[0047] Those skilled in the art should understand that the above description and the embodiments of the present invention shown in the drawings are only examples and do not limit the present invention. The object of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the embodiments. Without departing from the above principles, any deformation and modification of the embodiments of the present invention are possible.

Claims

1. A split-type modular drill, characterized in that: It includes a head module (10), a tool shank module (20), indexable inserts (13) and S-drill inserts (14). A chip pocket, a center drill positioning and mounting structure, and indexable insert slots (5) are provided on the head module (10). A number of indexable insert slots (5) are provided for mounting at least two sets of symmetrically arranged indexable inserts (13). The center drill positioning and mounting structure is used to cooperate with the S-drill insert (14) to achieve the positioning and mounting of the S-drill insert (14). The chip pocket includes a forming groove (1) and a chip evacuation groove (2). A docking structure is provided on the tool shank module (20), and the docking structure is used to achieve the positioning and docking of the head module (10) and the tool shank module (20).

2. The split-module drill according to claim 1, wherein: The center drill positioning and mounting structure includes a blade center positioning hole (3) and a positioning groove (4), and the positioning groove (4) conforms to the shape of the S-drill insert (14).

3. The split-module drill according to claim 1 or 2, characterized in that: The docking structure includes a positioning hole (25) provided on the tool shank module (20), and a positioning post (16) is provided on the head module (10). The positioning post (16) is inserted into the positioning hole (25) to achieve the positioning assembly of the head module (10) and the tool shank module (20).

4. The split-module drill according to claim 3, characterized in that: The head module (10) and the tool shank module (20) are connected by a locking screw (29).

5. The split-type modular drill according to claim 4, wherein: A locking inclined surface (19) is provided on the positioning post (16). When the locking screw (29) is screwed into the locking inclined surface (19), a downward pulling force will be generated due to the structural effect of the inclined surface.

6. The split-module drill according to claim 5, wherein: The docking structure further includes a rotation prevention structure.

7. The split-module drill according to claim 6, wherein: The rotation prevention structure includes a sector-shaped boss (17) provided on the tool shank module (20), and a sector-shaped groove (18) is provided on the head module (10).

8. The split module drill according to claim 7, characterized in that: The locking inclined surface (19) has a locking inclined surface deflection angle (27).

9. The split-module drill according to any one of claims 4-8, characterized in that: A guide bar (15) is installed on the head module (10).

10. The split-type modular drill according to claim 9, wherein: A cooling module is provided in the split-type modular drill. The cooling module includes a central cooling channel (8), a central cooling hole, and an outer cooling hole (9). The central cooling channel (8) is provided in the tool shank module (20), and the central cooling hole and the outer cooling hole (9) are provided on the head module (10). The central cooling hole and the outer cooling hole (9) are connected to the central cooling channel (8).

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