CN212169101U - A large-diameter twist drill with double R groove - Google Patents

Abstract

The utility model discloses a double-R groove type large-diameter twist drill, which comprises a drill bit main body and a drill shaft. There are two cutting edges, the two cutting edges are arranged in a spiral structure, and there are corresponding chip removal grooves between the two cutting edges. The middle part of the end is provided with a positioning groove, the drill shaft is provided with two internal cooling grooves distributed in a spiral structure in the positioning groove, and two R angles are provided in the chip removal groove. The utility model has the advantages of simple, reasonable and reliable structure, convenient processing and use, and the chip removal mode can be changed by changing the chip removal groove shape of the twist drill, so as to achieve the purpose of breaking the chips without wrapping the chips and making the chip removal smooth.

Description

A large-diameter twist drill with double R groove

technical field

The utility model relates to the field of tools for machining engine oil pumps in the automobile industry, in particular to a large-diameter twist drill with double R grooves.

Background technique

The drill bit is used for roughing and drilling. The drill bit introduced in this article is to process a D15 hole. Due to customer limitations, there is no extra turret for installing tools, resulting in a maximum of 3 tools for this hole design, so the drill bit for processing bottom holes The outer diameter cannot be too small. If the bottom hole drill is too large, it will cause problems such as difficult chip removal and large processing resistance, and the processed material is a steel with good toughness, which is not easy to break chips, which makes chip removal even more difficult. The drill bit is often chipped due to the problem of continuous chipping. Originally, the drill bit can be ground three times. Due to chipping, it is often unable to be ground after one use, which increases the customer's cost.

Utility model content

The purpose of the utility model is to provide a simple, reasonable and reliable structure, which is easy to process and use. The chip removal method can be changed by changing the chip removal groove shape of the twist drill, so as to achieve the purpose of breaking the chips without turning the chips around and making the chip removal smooth. Large diameter twist drill with double R geometry.

The technical scheme of the present invention is that a double-R groove type large-diameter twist drill comprises a drill bit main body and a drill shaft. The surface of the main body is provided with two cutting edges, the two cutting edges are arranged in a spiral structure, and there are corresponding chip removal grooves between the two cutting edges. A positioning groove is arranged in the middle of the tail end of the shaft, the drilling shaft is provided with two internal cooling grooves distributed in a spiral structure in the positioning groove, and two R angles are arranged in the chip removal groove.

In a preferred embodiment of the present invention, the diameter of the main body of the drill bit is smaller than the diameter of the drill shaft.

In a preferred embodiment of the present invention, the included angle between the ends of the two cutting edges is 140°.

In a preferred embodiment of the present invention, the two R-angles are spliced and arranged in the chip flute.

In a preferred embodiment of the present invention, the two R angles are respectively arranged on both sides of the middle of the chip flute.

The utility model relates to a large-diameter twist drill with double R grooves. The utility model has a simple, reasonable and reliable structure, and is convenient to process and use. The purpose of breaking the chip without going around the chip makes the chip removal smooth.

Description of drawings

1 is a front view in a preferred embodiment of the large-diameter twist drill of the double R groove type of the utility model;

Fig. 2 is the left side view of Fig. 1;

FIG. 3 is a right side view of FIG. 1 .

Detailed ways

The preferred embodiments of the present invention are described in detail below, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

The utility model is a large-diameter twist drill with double R grooves. As shown in FIG. 1 in conjunction with FIGS. 2 to 3 , it includes a drill bit body 1 and a drill shaft 2 , and the drill bit body 1 is correspondingly arranged on one side of the drill shaft 2 It is set as an integral structure to ensure the strength of the overall structure. The diameter of the drill bit body 1 is smaller than the diameter of the drill shaft 2, which is convenient for processing.

The surface of the drill main body 1 is provided with two cutting edges 3, the included angle α between the ends of the two cutting edges 3 is 140°, and the two cutting edges 3 are arranged in a spiral structure. One side is provided with an inner cooling hole 4, which is convenient for cooling during processing.

The middle of the rear end of the drill shaft 2 is provided with a positioning groove 5, and the drill shaft 2 is provided with two inner cooling grooves 6 distributed in a spiral structure in the positioning groove 5, which are also used to cool the twist drill during use. effect.

A chip removal groove 7 for chip removal is correspondingly arranged between the two cutting edges 3, and two R angles including R1 and R2 are spliced together on both sides of the middle of the chip removal groove 7. The chip breaking of the twist drill is caused by the processing speed. The iron chips quickly impact the R2 surface and break the iron chips, so that the chip removal is smooth, thereby reducing the chipping phenomenon of the twist drill and improving the service life of the twist drill.

The utility model relates to a large-diameter twist drill with double R grooves. The utility model has a simple, reasonable and reliable structure, and is convenient to process and use. The purpose of breaking the chip without going around the chip makes the chip removal smooth.

The above are only specific embodiments of the present utility model, but the protection scope of the present utility model is not limited to this. Any person skilled in the art can come up with ideas without creative work within the technical scope disclosed by the present utility model. Changes or substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined by the claims.

Claims (5)

1. The utility model provides a major diameter fluted drill of two R cell types, includes drill bit main part and drill spindle, the drill bit main part correspond set up in drill spindle one side and formula structure as an organic whole set up, drill bit main part surface is provided with two cutting edges, and two cutting edges are the setting of helical structure distribution, correspond respectively between two cutting edges and are provided with the chip groove, tip one side of cutting edge is provided with interior cold hole, the tail end middle part of drill spindle is provided with the constant head tank, the drill spindle is provided with the interior cold groove that two helical structure distribute in the constant head tank, its characterized in that: and two R angles are arranged in the chip grooves.

2. The large diameter twist drill of the double R flute type of claim 1, wherein: the diameter size of the drill bit main body is smaller than that of the drill shaft.

3. The large diameter twist drill of the double R flute type of claim 1, wherein: the included angle between the two cutting edge ends is 140 degrees.

4. The large diameter twist drill of the double R flute type of claim 1, wherein: and the two R corners are spliced in the chip grooves.

5. The large diameter twist drill of the double R flute type of claim 4, wherein: and the two R angles are respectively arranged on two sides of the middle part of the chip groove.

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