阅读说明：本技术 一种加工带内倒角阶梯孔的组合麻花钻 (Combined twist drill for processing stepped hole with inner chamfer ) 是由 姚继权 侯锋 尹晶 于 2021-09-22 设计创作，主要内容包括：本发明属于工业制造技术领域的一种组合式切削刀具,特别涉及一种加工带内倒角阶梯孔的组合麻花钻。包括带两个内冷却孔的大直径麻花钻(1)、调整轴套(2)、带两个内冷却孔的小直径麻花钻(3)。调整轴套(2)的作用是起到固定和定位,它使得带两个内冷却孔的大直径麻花钻(1)与带两个内冷却孔的小直径麻花钻(3)容屑槽能够对位,便于组合麻花钻的稳定钻削和切屑的顺利排出屑。另外两只麻花钻采取的是螺纹连接,大直径麻花钻在横刃部加工了退刀槽和内螺纹。组合麻花钻可针对各种不同尺寸和加工工艺要求的阶梯孔自由配合,一次走刀即可完成几把刀的工作量,简化了刀具的管理和成本费用,有效提高了生产效率。大小直径麻花钻均设置两个内冷却孔,提升了切削液在刀体内部流动的冷却效果,有效减少切削热带来的损害。(The invention belongs to the technical field of industrial manufacturing, and particularly relates to a combined twist drill for machining an inner-chamfer stepped hole. The large-diameter twist drill comprises a large-diameter twist drill (1) with two internal cooling holes, an adjusting shaft sleeve (2) and a small-diameter twist drill (3) with two internal cooling holes. The adjusting shaft sleeve (2) has the functions of fixing and positioning, so that the chip grooves of the large-diameter twist drill (1) with the two internal cooling holes and the small-diameter twist drill (3) with the two internal cooling holes can be aligned, and the stable drilling and the smooth chip discharging of chips of the combined twist drill are facilitated. The other two twist drills are in threaded connection, and the large-diameter twist drill is provided with a tool withdrawal groove and an internal thread on a chisel edge. The combined twist drill can be freely matched with stepped holes with different sizes and processing technological requirements, the workload of a plurality of cutters can be completed by one-time feeding, the management and cost of the cutters are simplified, and the production efficiency is effectively improved. Big and small diameter twist drill all sets up two interior cooling holes, has promoted the cooling effect of cutting fluid at the inside flow of cutter body, effectively reduces the harm that the cutting heat brought.)

1. The utility model provides a combination fluted drill of processing in-band chamfer shoulder hole which characterized in that: the method comprises the following steps: take major diameter fluted drill (1) in two internal cooling holes, adjustment axle sleeve (2), minor diameter fluted drill (3) in two internal cooling holes in area, the internal thread of major diameter fluted drill (1) and the external screw thread of minor diameter fluted drill (3) assemble the combination fluted drill, the adjustment axle sleeve is for making the chip groove of two fluted drills can counterpoint, the stable drilling and the in the same direction as the advantage chip removal of being convenient for make up the fluted drill, major diameter fluted drill (1) all sets up two internal cooling holes with minor diameter fluted drill (3), the cooling effect of cutting fluid at the inside flow of cutter body has been promoted, effectively reduce the harm that the cutting heat brought.

2. The combination twist drill for machining a stepped hole with an inner chamfer according to claim 1, wherein: the large-diameter twist drill (1) comprises two inner cooling holes (1-1), a twist drill handle (1-2), a twist drill body (1-3), a twist drill tip (1-4), a tool withdrawal groove (1-5), internal threads (1-6) and a twist drill main cutting edge (1-7).

3. The combination twist drill for machining a stepped hole with an inner chamfer according to claim 1, wherein: the small-diameter twist drill (3) comprises two inner cooling holes (3-1), a twist drill handle (3-2), an external thread (3-3), a twist drill body (3-4), a twist drill tip (3-5) and a twist drill chisel edge (3-6).

Technical Field

The invention belongs to the technical field of industrial manufacturing, and particularly relates to a combined twist drill for machining an inner-chamfer stepped hole.

Background

The stepped holes are distributed with a series of cylindrical holes with different specifications on the same axis like steps and are frequently used in some standard parts and assembly parts. The traditional machining of the stepped hole generally requires two cutters to be machined in different procedures, and burrs often appear on the edge of a machined end plane; some special tools can only drill stepped holes with fixed aperture sizes, and the tool does not have universality; twist drills typically employ external cooling, resulting in a higher temperature inside the drill body. The processing methods have the defects of low efficiency, low precision, difficult chip removal, poor heat dissipation, higher input cost and the like.

Disclosure of Invention

The invention aims to design a combined twist drill with an internal cooling function for machining a stepped hole with an internal chamfer aiming at the defects of the prior art.

The invention is realized by the following technical scheme, and the specific scheme is as follows:

a combined twist drill for machining a stepped hole with an inner chamfer comprises a large-diameter twist drill with two inner cooling holes, an adjusting shaft sleeve and a small-diameter twist drill with two inner cooling holes. Two fluted drills pass through threaded connection and are in the same place, and the cooperation adjustment axle sleeve makes the chip groove of two fluted drills can counterpoint, and the stable drilling and the in the same direction as the advantage chip removal of the combination fluted drill of being convenient for, big small diameter fluted drill all set up two internal cooling holes, have promoted the cooling effect of cutting fluid at the inside flow of cutter body, effectively reduce the harm that the cutting heat brought.

Preferably, the large-diameter twist drill consists of two inner cooling holes, a twist drill handle, a twist drill body, a twist drill tip, a tool withdrawal groove, an internal thread and a twist drill main cutting edge.

Preferably, the two inner cooling holes of the large-diameter twist drill penetrate through the whole drill body, the cutting fluid flows in from the cooling holes of the large-diameter twist drill, passes through the tool withdrawal groove and the inner cooling holes of the small-diameter twist drill, and finally flows out from the two cooling holes at the drill tip of the small-diameter twist drill, so that the cutting temperature of the combined twist drill is fully reduced.

Preferably, the small-diameter twist drill consists of two inner cooling holes, a twist drill handle, an external thread, a twist drill body, a twist drill tip and a twist drill chisel edge.

Preferably, the chip groove of the small-diameter twist drill is opposite to the chip groove of the large-diameter twist drill, so that the auxiliary cutting edge of the large-diameter twist drill can participate in drilling movement and smoothly complete the chip removal process, a stepped hole with an inner chamfer is machined, and a cylindrical hole with a chamfer can also be directly machined.

Compared with the prior art, the invention has the beneficial effects that:

the combined twist drill assembled by the large-diameter twist drill and the small-diameter twist drill can process different sizes of stepped holes under the condition of one-time feed, and the two internal cooling holes have better cooling effect.

Drawings

Fig. 1 is a view of a combination twist drill with cooling function for machining a stepped hole with an inner chamfer.

Fig. 2 is a front and right side view of a large diameter twist drill.

Fig. 3 is a front and right side view of a small diameter twist drill.

FIG. 4 shows an inner chamfered stepped bore.

In the figure, 1-a large-diameter twist drill with two inner cooling holes; 1-1 cooling the hole; 1-2, drilling a tip of a twist drill; 1-3 twist drill bodies; 1-4 twist drill handles; 1-5 tool withdrawal grooves; 1-6 internal threads; 1-7 main cutting edges of twist drills; 2-adjusting the shaft sleeve; 3-a small-diameter twist drill with two inner cooling holes; 3-1, cooling the hole; 3-2, a twist drill handle; 3-3 external threads; 3-4 twist drill bodies; 3-5, drilling tip of the twist drill; 3-6 twist drill chisel edge.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to attached drawings 1-3, a large-diameter twist drill (1) and a small-diameter twist drill (3) are selected according to the size of a stepped hole and are fixed by an adjusting shaft sleeve (2), and an external thread at the drill handle of the small-diameter twist drill (3) is screwed into an internal thread of the large-diameter twist drill (1) to complete assembly; during drilling, cutting fluid flows in from the cooling holes (1-1) of the large-diameter twist drill (1), passes through the tool withdrawal grooves (1-5) and the inner cooling holes (3-1) of the small-diameter twist drill (3), and finally flows out from the two cooling holes (3-1) of the drill tip of the small-diameter twist drill (3), so that the cutting temperature of the combined twist drill is fully reduced.

The stepped hole is processed, a twist drill (3) with small diameter is firstly drilled, when a certain distance is drilled,

the main cutting edges (1-7) of the large-diameter twist drill (1) participate in drilling until a stepped hole with a desired depth is machined. The large-diameter twist drill (1) and the small-diameter twist drill (3) can be assembled together to complete the drilling of the stepped hole according to the stepped holes with different sizes.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.