JPS614611A - Drill reamer - Google Patents

Abstract

PURPOSE:To simplify the rough hole forming and finishing processes into a single process by forming a rough cutting edge for forming a rough hole and a finishing cutting edge for drill reamer working alternatively on a drill reamer body portion. CONSTITUTION:A cutting edge portion 14 is provided with three cutting edge portions 16a, 16b, 16c which have respectively rough cutting edges 18a, 18b, 18c for working a rough hole and finishing cutting edges 20a, 20b, 20c. Between the rough cutting edge and the finishing one are provided relief grooves 22a, 22b, 22c and 24a, 24b, 24c for ejecting chips. The rough hole is formed by the rotation of the rough cutting edges 18a, 18b, 18c, while precise work finishing is carried out at a time by rotating finishing cutting edges 20a, 20b, 20c.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drill reamer, and more particularly, the present invention relates to a drilling process for making a pilot hole, and a process for forming the pilot hole into a hole having a precise surface according to the dimensions. This invention relates to a drill reamer that can simultaneously carry out the finishing process.

A drill reamer is generally suitable for drilling holes with high precision. That is, a pilot hole is previously formed with a drill, and a drill reamer is passed through the pilot hole to perform precision machining so that the hole has the correct dimensions. In order to form such a highly accurate hole, in the prior art, at least two processing steps had to be performed as described above. Therefore, these two steps complicate the process itself, and require equipment to use both drills and drill reamers alternately, resulting in a significant economic burden or shifting from drilling to drill reaming during the process. It has been pointed out that this process involves moving the workpiece, which is inconvenient and wastes a lot of time.

Furthermore, when a drill and a drill reamer are used together to form a precise hole, small holes are often generated when the drill is removed from the pilot hole, and these must be removed manually. Therefore, as a result of intensive studies and efforts, the inventors of the present invention have developed a rough blade for forming at least a pilot hole in the main body of the drill reamer, and a finish for performing the drill reamer processing. By rotating the drill reamer body, the roughing blade first forms a pilot hole on the workpiece, and then the finishing blade smoothly finishes the cutting surface of the pilot hole. With this configuration, the process of precision hole forming that conventionally used two tools, a drill and a drill reamer, can be simplified into a single process, and time is also saved, and it does not involve changing tools or moving the workpiece. It has been found that accurate hole machining can be achieved in one work step without any problems, and the above-mentioned disadvantages can be eliminated.

Therefore, the purpose of the present invention is to achieve the pilot hole forming process and finishing process at once in precision hole finishing.
To provide a drill reamer that simplifies the manufacturing process, saves machining time, and further improves efficiency.

To achieve the above object, the present invention provides a drill reamer having a handle part and a blade part, the drill reamer including at least three cutting blade parts, each of the cutting blade parts consisting of a rough blade and a finishing blade, The finishing blade is characterized in that its length in the radial direction is larger than that of the roughing blade.

Next, preferred embodiments of the drill reamer according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a drill reamer;
This drill reamer 10 basically has a handle part 12 and a blade part 14.
including. The handle portion 12 forms a so-called straight shank, and a flat portion 15 is formed extending from the end toward the center for holding by a rotational drive source (not shown). In this case, the blade part 14 has three cutting blade parts 16a, 16b, and 16C separated and formed at equal intervals in the circumferential direction, as can be easily understood from FIG.
The cutting edge portion 16a includes a roughing edge 18a for drilling a prepared hole and a finishing edge 20a connected thereto. Similarly, the second cutting edge portion 16b and the third cutting edge portion 16C have rough edges 18b, 18C1 finishing edges 20b, 20C, respectively. Rough blade 18= and finishing blade 20
A relatively shallow and arcuate clearance groove 22a is formed between the rough blade 18b and the finishing blade 20b for releasing chips cut by the finishing blade 20a.
A relief s22b is also formed between the finishing blade 20b for releasing chips generated by the finishing blade 20b. Similarly, an escape groove 22c is formed between the rough blade 18C and the finishing blade 20c.

In this case, as can be easily understood from Fig. 2, the rough blade 1
The radial length of 8a, 18b, 18C is the finishing blade 20.
A, 20b, and 20c are selected to be slightly shorter than those, and the clearance grooves 2.22 to 22C are selected to have an opening α of about 40°, which is suitable for leading out the chips to the outside. On the other hand, a rough blade 18 is provided between the first cutting blade part 16a and the second cutting blade part 16b, that is, between the finishing blade 20a and the rough blade 18b.
A clearance groove 24a is formed to guide relatively large chips generated by the cutout 24b to the outside. In the same way, finishing blade 2
An escape groove 24b is also formed between 0b and the rough blade 18C,
Furthermore, there is also a clearance groove 2 between the finishing blade 20c and the roughing blade 18a.
4c is formed. As shown in the figure, relief grooves 24a to 2
The depth of the relief grooves 4c is selected to be larger than that of the relief grooves 22a to 22c.

Note that the tip portions of the relief grooves 24a, 24b, and 24C extend obliquely at a predetermined angle to the center of the drill reamer 10, and form notches 26a, 26b, and >6C, respectively. Cutting blade portions 16a to 16c configured in this way
extend spirally in the direction of the handle 12, respectively. In this case, for example, the cutting blades 16a to 16C and the drill reamer 10
It is suitable for ejecting chips if the helix angle with respect to the axis is selected to be about 356.

The drill reamer according to the present invention is basically constructed as described above, and its operation and effects will be explained next.

For example, the flat portion 15 is connected to a rotational drive source (not shown).
When connected via a chuck or the like, the drill reamer 10 rotates at a high speed when the rotational drive source is started. Then, when the tip of the drill reamer 10 is brought into contact with a workpiece (not shown) and displaced along its axial direction, the tip of the blade portion 14 starts cutting the workpiece. In this case, first, the rough blade 18a corresponding to the notches 26a to 26c is
The radially extending ends of 18C to 18C substantially begin the cutting process for forming a pilot hole in the workpiece.

As described above, since the diameter of the roughing blades 18a to 18b is selected to be smaller than that of the finishing blades 20a to 20C, a hole is formed in the workpiece within the range of the diameter. In this case, the chips generated by this cutting process will escape from $242 to $24.
C, it passes through the spiral groove and is transferred toward the handle portion 12.

As can be understood from FIG. 2, the escape grooves 24a to 2
Since the relief holes 4C are formed deeper than the relief holes 222 to 22C, relatively large chips generated by the rough edges 18a to 18C can be easily guided to the outside.

On the other hand, the rotation of the rough blades 18a to 18c necessarily accompanies the rotation of the finishing blades 20a to 20c. That is, for example,
The precision machining and finishing process of the finishing blade 20a immediately follows the pilot hole machining process of the rough blade 18a. Therefore, rough blades 18a to 18c
All prepared holes formed by the finishing blades 20a, 20
With precision machining and finishing according to c, a hole with the desired dimensions is formed in the workpiece. At this time,
As described above, relatively small chips generated by the finishing blades 20a to 20c are discharged to the outside by the relief grooves 22a to 22C. Moreover, at the stage of transition from finishing to rough cutting, the relief grooves 24a to 24C are deeper than the relief grooves 1li22a to 22C and are cut into the center of the drill reamer, so the drill reamer There is no possibility that cutting friction will occur due to rotation.

Furthermore, according to the structure of the drill reamer according to the present invention, the chip discharge route of the rough edges 18'a to 18C and the finishing edge 2
Since the chip release routes 0a to 20c are formed to have different depths, each chip does not invade other cutting edges, and therefore,
Since the chips do not come into contact with other cutting edges during cutting, various inconveniences such as damage to the cutting edge portion can be avoided.

According to the present invention, since a single drill reamer is equipped with a roughing blade and a finishing blade as described above, the primary process for drilling a pilot hole is not required, which increases equipment costs in factories, etc. can be reduced. In addition, drilling a pilot hole using only a rough blade may cause stiffness when the drill is pulled out, but with the present invention, there is less possibility of loss of autonomy, especially for workpieces that exhibit sticky characteristics. It can work well. Furthermore, during cutting,
Although runout may occur at the tip of the drill reamer, according to the present invention, since the rough cutting edge and the finishing cutting edge are configured to contact the hole of the workpiece at at least 6 points, the 6-point support allows There is no wobbling of the drill reamer itself, making stable cutting possible.

According to the present invention, although the structure is simple as described above, there is no need for the drilling device itself required for drilling the pilot hole, and it also has the advantage of being able to drill precisely with the desired dimensions. be. Therefore, for mass-produced workpieces, production efficiency can be greatly improved, and equipment costs can be extremely reduced, among other effects.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and changes in design are possible without departing from the gist of the present invention. Of course.

[Brief explanation of the drawing]

FIG. 1 is a front view of a drill reamer according to the present invention, and FIG. 2 is a partial end view of the tip of the drill reamer according to the present invention. 10...Drill reamer 12...Handle part 14...Blade part
15...Flat part 16a to 16C...Cutting edge part
18a-18C... Rough blade 20a-20C... Finishing blade 2
2a to 22C...Escape groove 24a to 24c...Escape groove 2
6a-26c... Notch part Patent applicant Honda Motor Co., Ltd. Procedural amendment (Own ship February 21, 1985 1, Indication of incident 1985 Patent side No. 123336 2) Name of invention Drill reamer 3. Relationship with the case of the person making the amendment Patent applicant address: 6-27-8 Jingumae, Shibuya-ku, Tokyo
Name Title Honda Motor Co., Ltd. 4, Agent 6, Subject of amendment (1) Detailed description of the invention column 7 of the specification, Contents of amendment (1) Amendment to attached patent application No. 123336/1982 The phrase "In cases of high precision" in lines 5 to 20 of page 2 of the specification will be corrected as follows. [Reamers are generally preferred for drilling holes with high precision. That is, a pilot hole is previously formed with a drill, and a reamer is passed through the pilot hole to perform precision machining so that the hole has the correct dimensions. In order to form such a highly accurate hole, in the prior art, at least two processing steps had to be performed as described above. Therefore, these two steps complicate the process itself, and require equipment to use both the drill and reamer alternately, resulting in a significant economic burden, or changing the process from drilling to reaming during the process. It has been pointed out that the transition involves moving the workpiece, which is inconvenient and wastes a lot of time. Furthermore, when forming precise holes by using a drill and reamer together, 2) "Drill reamer" in lines 6 and 7 of page 3 should be corrected to "reamer." 3. Correct "Trill Reamer" in line 12 of page 3 to "Reamer".

Claims (2)

[Claims] (1) In a drill reamer having a handle part and a blade part, the drill reamer includes at least three cutting blade parts, each of the cutting blade parts consists of a rough blade and a finishing blade, and the finishing blade is different from the rough blade. A drill reamer characterized in that the drill reamer is configured to increase the length in the radial direction. (2) In the drill reamer according to claim 1, a relief groove is defined between the rough edge and the finishing edge constituting the cutting edge, and the relief groove is defined between the adjacent cutting edge parts. A drill reamer whose depth is selected to be smaller than the relief groove defined by the reamer.