阅读说明：本技术 一种带内冷却的可转位大直径定心钻 (Indexable large-diameter centering drill with internal cooling ) 是由 周道俊 范凡 范仲舜 于 2019-10-23 设计创作，主要内容包括：一种带内冷却的可转位大直径定心钻,包括刀体、连接杆,刀体顶端中心设有定心钻,定心钻周围设有以定心钻为中心对称的外刃刀片座和内刃刀片座,外刃刀片座和内刃刀片座上设有若干刀片槽。外刃刀片座侧边设有直径微调螺丝孔,安装外刃刀片座时通过紧固螺丝及防松垫片将外刃刀片座固定在刀体上,然后通过微调螺丝调节直径尺寸。刀体侧面设有与定心钻底部相通的轴向调节螺纹孔,轴向调节螺纹孔内设有相应的轴向调节螺丝,轴向调节螺纹孔上方设有锁紧螺丝,安装定心钻时先旋转轴向调节螺丝使定心钻与刀具上端面保持适当距离,然后通过锁紧螺丝紧固定心钻。本发明具有定心钻可调节精度高、刀片直径尺寸可以调节、刀片使用寿命长安装牢固的特点。(The indexable large-diameter centering drill with internal cooling comprises a cutter body and a connecting rod, wherein the centering drill is arranged at the center of the top end of the cutter body, an outer cutting blade seat and an inner cutting blade seat which are symmetrical by taking the centering drill as a center are arranged around the centering drill, and a plurality of blade grooves are formed in the outer cutting blade seat and the inner cutting blade seat. The outer blade seat side is equipped with diameter fine setting screw hole, fixes outer blade seat on the cutter body through fastening screw and locking gasket when installing outer blade seat, then adjusts the diameter size through the fine setting screw. The side surface of the cutter body is provided with an axial adjusting threaded hole communicated with the bottom of the centering drill, a corresponding axial adjusting screw is arranged in the axial adjusting threaded hole, a locking screw is arranged above the axial adjusting threaded hole, the axial adjusting screw is firstly rotated to keep the centering drill at a proper distance from the upper end surface of the cutter when the centering drill is installed, and then the centering drill is tightly fixed through the locking screw. The centering drill has the characteristics of high adjustable precision, adjustable diameter and size of the blade, long service life of the blade and firm installation.)

1. The utility model provides an in-band indexable major diameter pilot drill of internal cooling, includes cutter body (1), connecting rod (2), and cutter body top center is equipped with pilot drill (3), is equipped with around pilot drill (3) and uses pilot drill (3) as outer sword blade bearing (6) and interior sword blade bearing (12) of central symmetry, is equipped with a plurality of blade grooves on outer sword blade bearing (6) and interior sword blade bearing (12), its characterized in that: the cutter body (1), the connecting rod (2) and the centering drill (3) are internally provided with cooling channels (16) which are communicated with each other, the opening of each cooling channel (16) is arranged at the bottom end of the connecting rod (2), and the other end of each cooling channel is connected below the blade seat and on two rear corners of the centering drill (3);

an axial adjusting threaded hole (17) communicated with the bottom of the centering drill (3) is formed in the side face of the cutter body (1), a corresponding axial adjusting screw (4) is arranged in the axial adjusting threaded hole (17), and a locking screw hole and a corresponding locking screw (5) are arranged above the axial adjusting threaded hole (17);

the outer blade seat (6) is provided with a fastening screw a (8) for fixing and a compression screw a (10) positioned on a diagonal line, a blade groove of the outer blade seat (6) is provided with an outer blade (7), the side edge of the outer blade seat (6) is provided with a diameter fine-adjustment screw hole (11), and the bottom of the diameter fine-adjustment screw hole (11) is abutted against the lower end of the fastening screw a (8);

the inner blade seat (12) is provided with a fastening screw b (19) and a compression screw b (20) for fixing, and the blade groove of the inner blade seat (12) is provided with an inner blade (13).

2. An in-band cooled indexable large-diameter pilot drill according to claim 1, wherein: the connecting rod (2) is provided with a conical through hole (15).

3. An in-band cooled indexable large-diameter pilot drill according to claim 1, wherein: the bottom end of the cutter body (1) is provided with a transmission piece (14) fixed by a fastening screw c (21).

4. An in-band cooled indexable large-diameter pilot drill according to claim 1, wherein: the fastening screw a (8) is provided with a locking gasket a (9), and the fastening screw b (19) is provided with a locking gasket b (22).

5. An in-band cooled indexable large-diameter pilot drill according to claim 1, wherein: the angle between the axial adjusting threaded hole (17) and the centering drill exceeds 90 degrees.

6. An in-band cooled indexable large-diameter pilot drill according to claim 1, wherein: an included angle smaller than 90 degrees is formed between the fastening screw hole (18) where the fastening screw a is located and the bottom surface of the outer blade seat.

7. An indexable large-diameter pilot drill with internal cooling according to claim 1, characterized in that the overlap dimension of the pilot drill (3) and the inner edge insert (13) on the side of the pilot drill in the inner edge insert seat (12) is 0.6mm ~ 0.8.8 mm.

8. An in-band cooled indexable large-diameter pilot drill according to claim 1, wherein: the compression screw b (20) fixes the inner blade seat (12) on the cutter body (1) through the eccentric principle, so that the inner blade seat (12) is tightly attached to three sides of the cutter body (1).

Technical Field

The invention relates to a cutter, belongs to the technical field of machining, and particularly relates to an indexable large-diameter centering drill with internal cooling.

Background

Hole drill processing often meets when mechanical factory processes the part, although the hole drill on the market has had better assurance to the machining precision of hole, the smooth finish on surface, and can dismantle the centering drill, interior sword blade holder, outer sword blade holder and process the drilling of different diameters, for example patent 201410011431.8, can adjust the position of outer sword cutter holder but not give concrete method, with interior sword cutter holder, outer sword cutter holder, the centering drill sets up into removable accessory and comes the drilling to different requirements, but the hole drill is interior sword blade holder in the use, outer sword blade holder not only changes the trouble, it is easy not hard up, and the size control precision of centering drill and cutter body terminal surface is also not high.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides an indexable large-diameter pilot drill with internal cooling, which has the characteristics of firm installation of blades, difficulty in loosening, adjustable diameter of the blades and high adjustment precision of the pilot drill.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the indexable large-diameter centering drill with internal cooling comprises a cutter body and a connecting rod, wherein the centering drill is arranged at the center of the top end of the cutter body, an outer blade seat and an inner blade seat which are centrosymmetric are arranged around the centering drill, a plurality of blade grooves are formed in the outer blade seat and the inner blade seat, cooling channels which are communicated with each other are arranged inside the cutter body, the connecting rod and the centering drill, openings of the cooling channels are formed in the bottom end of the connecting rod, and the other ends of the cooling channels are connected to the lower part of the blade seat and two rear angles of the centering drill.

The side face of the cutter body is provided with an axial adjusting threaded hole communicated with the bottom of the centering drill, a corresponding axial adjusting screw is arranged in the axial adjusting threaded hole, a locking screw hole and a corresponding locking screw are arranged above the axial adjusting threaded hole, the bottom of the centering drill is provided with a taper inclined plane, the axial adjusting screw abuts against the taper inclined plane, the axial adjusting screw is rotated firstly when the centering drill is installed, so that the centering drill keeps a proper distance from the upper end face of the cutter, and then the centering drill is tightly fixed through the locking screw.

The outer blade seat is provided with a fastening screw a for fixing and a compression screw a positioned on the diagonal line, the blade groove of the outer blade seat is provided with an outer blade, the side edge of the outer blade seat is provided with a diameter fine-adjustment screw hole, the bottom of the diameter fine-adjustment screw hole is abutted against the lower end of the fastening screw a, the outer blade seat is fixed on the cutter body through the fastening screw and a locking gasket when the outer blade seat is installed, then the diameter size is adjusted through the fine-adjustment screw, and the displacement is S.

The inner blade seat is provided with a fastening screw b and a pressing screw b for fixing, and the blade groove of the inner blade seat is provided with an inner blade.

Preferably, the connecting rod is provided with a conical through hole.

Preferably, the bottom end of the cutter body is provided with a transmission part fixed by a fastening screw c, and the transmission part is matched with the corresponding notch of the cutter handle to achieve the fixing effect.

Preferably, the fastening screw a is provided with a locking washer a, and the fastening screw b is provided with a locking washer b, so that the fastening screw is more durable in fixing and is not easy to loosen.

Preferably, the angle between the axial adjusting threaded hole and the centering drill exceeds 90 degrees.

Preferably, an included angle a smaller than 90 degrees exists between the fastening screw hole where the fastening screw a is located and the bottom surface of the outer blade insert seat, so that two main surfaces of the outer blade insert seat and the cutter body can be tightly attached, and sufficient connection rigidity is guaranteed.

Preferably, the overlapping dimension of the inner edge blade on the side close to the pilot drill and the pilot drill on the inner edge blade seat is 0.6mm ~ 0.8.8 mm.

Preferably, the compression screw b fixes the inner blade seat on the cutter body through an eccentric principle so that the inner blade seat is tightly attached to three sides of the cutter body, thereby enhancing the rigidity and ensuring the overlapping size of a blade on the inner blade seat and the pilot drill to be 0.6-0.8 mm.

The invention has the beneficial effects that: aiming at the defects that the diameter of the existing hole drill can not be adjusted, the centering drill is low in precision, and the blade is easy to loosen, the axial adjusting screw, the diameter fine adjusting screw and the double-screw are adopted for installing the blade, and the adjustable centering drill has the characteristics that the adjustable precision of the centering drill is high, the diameter size of the blade can be adjusted, and the blade is long in service life and firm in installation.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a schematic view of the structure of the cutter body of the present invention;

FIG. 3 is a schematic view of the inner blade seat of the present invention;

fig. 4 is a schematic view of the construction of the outer blade holder according to the invention.

In the figure: 1. a cutter body; 2. a connecting rod; 3. a centering drill; 4. an axial adjusting screw; 5. locking screws; 6. an outer-edge blade holder; 7. an outer-edge blade; 8. a fastening screw a; 9. a locking washer a; 10. a compression screw a; 11. diameter fine adjustment screw holes; 12. an inner-edge blade holder; 13. an inner-edge blade; 14. a drive key; 15. a tapered through hole; 16. a cooling channel; 17. an axial adjusting screw; 18. fastening a screw hole; 19. a fastening screw b; 20. a compression screw b; 21. a fastening screw c; 22. and a locking gasket b.

Detailed Description

The invention will be further illustrated by the following description and the accompanying drawings.