JPS59205211A - Combination drill - Google Patents

Abstract

PURPOSE:To permit a drill to smoothly perform both its drilling and reaming works further enable also its lubrication and cooling to be effectively performed, by respectively communicating each reamer flute in a reamer part not to a drill flute but to a subflute parallelly provided to the drill flute. CONSTITUTION:First at drilling time, drilling work is performed by a drill part D, and its chip is smoothly discharged along a dike part 18 because the end of reamer edges 15 is not disclosed on the upper side of a drill flute 7. While at reaming finish work performed by a reamer part R, its generated chip is smoothly transferred from reamer flutes 16 to a subflute 11 and discharged to a point end part 6 via the subflute 11 without causing any difficulty, thus also its reaming work can be smoothly performed. Further the chip being not blocked in the drill flute 7 enables cutting oil to be smoothly supplied to the point end part 6, thus sufficiently performing the lubricating and cooling action. In such way, both drillig and reaming works can be smoothly performed together, and a limitation relating to a machining condition can be eased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a combination drill in which a drill portion and a reamer portion are formed in series on the same axis.

In order to perform hole drilling with a drill and internal finishing with a reamer at the same time, K, the drill part at the tip, the intermediate reamer part,
There is a known tool in which the handle part at the rear end is formed in a series on the same axis, but this has been improved to form a drill groove continuously in one direction from the tip of the drill part to the entire length of the reamer part in a spiral shape. A combination drill is one in which the reamer blade and reamer groove of the reamer part are formed in a part corresponding to the land of the drill in a spiral shape in the opposite direction of the drill groove, and each reamer groove is communicated with the drill groove. (See Japanese Unexamined Patent Publication No. 58-56719, hereinafter referred to as prior art example). In this prior art example, the chips produced by the reamer blade are dropped from the reamer groove into the drill groove and are discharged using the drill groove, and the reamer blade spirals in the opposite direction to the drill groove. It is characterized by the ability to perform highly accurate machining in a short time, due to the large helix angle of the reamer blade.

However, in this prior art example, since the bright line of the reamer blade protrudes at an acute angle at the part corresponding to the heel of the side edge of the drill groove, chips during drilling flow along the drill groove and into the handle part. When the paper is ejected in the direction K, it may get caught on the protrusion and may not be ejected smoothly. For this reason, the trapped chips prevent the ejection of chips during reaming, and if drilling is performed with continuous feed, continuous chips will be generated, and once these chips get caught, they will wrap around and become impossible to machine. Since it is easy to damage the tool or workpiece, it is necessary to take measures such as using step feed to prevent continuous chips from being generated, which poses a problem in that machining conditions are restricted.

The present invention has focused on this point and has been made with the aim of providing a combination drill that can smoothly discharge chips, and the drill portion, reamer portion, and handle portion are formed in a series as in the prior art example. A drill groove is formed in a continuous spiral in one direction from the tip of the drill part over the entire length of the reamer part, and the reamer blade and reamer groove of the reamer part form a drill groove in a part corresponding to the land of the drill. In a combination drill formed in a spiral shape in the opposite direction, a sub-groove is formed on the heel side of the part corresponding to the land, independent of the drill groove and parallel to the drill groove, from the tip of the drill part to the reamer part. It is characterized in that it is formed over the entire length, and each reamer groove of the reamer portion is communicated with the sub groove through a drill groove. Therefore, the original tJIK
According to the report, the chips from drilling do not interfere with the reamer blade, which improves the evacuation condition, and the chips from reaming are ejected from the sub-groove, so the chips from drilling reduce the evacuation. This allows both drilling and reaming to be performed smoothly without any hindrance, and also improves the lubrication and cooling effects that remove chips and prevents seizure and discoloration due to heat. It is difficult to cause pain.

Hereinafter, the present invention will be explained with reference to the illustrated embodiment.

In the figure, C1) is a combination drill;
As shown in Figure 1, the tip is on the axis X-X (bottom of the figure).
From the rear end K, a drill portion Ds'), a drill portion R1, and a handle portion S are formed in series.

The drill part DFi is basically the same shape as a normal right-handed helix drill, and has a chisel edge (2). J h blade (
gl, the tip consisting of the rake face (4) and the flank face (6) (
6) is formed at the leading edge, and a drill groove (7) is formed continuously on the rake face (4)K, and along this drill groove (71K), the margin (8) and the second cut surface (9) are spirally formed. The drill groove (γ) is extended to the reamer portion R with the same lead, and is cut up at the end of the reamer portion R closer to the handle portion S.

(11) is a sub-groove provided according to the present invention, and the drill groove (7) is located on the heel side of the portion corresponding to the land consisting of the margin (8) and the second cut surface (9). The drill grooves (7) are provided independently in KM rows.

And its formation range is 111fl beyond the drill part 5
(61 pieces) The length of the reamer portion R is smaller than the width and depth of the drill groove (7).

The reamer part R takes the reamer blade 05), which is formed with a left-handed helix in this example, in the opposite direction to the drill groove ()) and one reamer groove (
It is equipped with lφ. This reamer blade θ6) and reamer groove α1
1 is a bank-like part formed between the leading edge side of the side edge of the drill groove (7) and the sub groove (1), that is,
A part corresponding to the land consisting of the margin (8) and the part up to the sub-groove (1■) of the second recess face (9) is provided with a diameter slightly larger than that of the drill part, and its helix angle The helix angle of .theta.1 is selected to be in the range of 40 to 65 degrees, whereas the helix angle of a normal reamer is 4 to 10'. Also,
The reamed groove (the depth of Iφ is shallower than the minor groove (II), reamer blade 05) and the reamed groove (16) are cut out at the intersection of the drill groove (7) and the minor groove (1). Both ends of each reamer groove (+61) communicate with the drill groove (7) and the minor groove (Ill K).In this way, the reamer blade (+6) connects the drill groove (7) and the minor groove (+1). Although it is divided by K, the number of teeth when considered as a continuous spiral is 3 for thin ones with a diameter of less than 10 mm due to processing problems during manufacturing, and for those with a diameter of less than 10 to 42 mm. So 4
If the diameter is larger than this, it is appropriate to set the diameter to 6 or more.

Regarding the dimensional relationship between the drill groove (7), the minor groove (river), the reamer blade (15), and the reamer groove 0 (2), as shown in Figure 4, the VC, margin (8), and minor groove (river) If the reamer blade (15) and the reamer groove H are not provided, the original land width consisting of the second chamfer surface (9) is A, and the width of the sub groove (the width of the river is A). A bank-like part (1
8+ width! , then the dimensions of each part can be selected in consideration of efficiency during reaming, removal of chips, etc., so that No ≧ and Tsuno 3 ≦ + Karasudashi No! □ 10), Ten No 3 Desirable. Fig. 3 shows a cross-sectional view of the reamed part R. The levee-like part (l→ is not in contact with the workpiece, and K is so that the chips are not caught between the workpiece and the workpiece. The height is set to maintain a gap of 0.1 to 0.2 cod.

In addition, the part of the reamer part R closest to the drill part is the chamfered part, and the reamer blade 05) in this part is the main cutting edge, and the other reamer blades (+5) are the secondary cutting edges. ing. (Incorporated) and 1) are the margin and flank of the reamer part R, respectively, and the handle is the shank of the handle part S.

The combination drill (1) of this embodiment has the above-described configuration, and its operation during hole drilling is as follows. First, drilling is performed using the drill part, and the chips at this time are sent upward through the drill groove +7) and discharged. When it is sent upward, it is often pressed against the upper side of the drill groove (7), that is, the heel side, due to the rake angle, etc., but this part is different from the prior art example. As a result, the edge of the reamer blade 05) is not exposed, and the chips are smoothly discharged along the embankment 5 (18) regardless of the reamer blade (+5). On the other hand, when the inner surface is finished using the reamer portion R, the chips generated during reaming are removed from the minor groove (1) due to the reaming condition.
1), and passes through the minor groove (II) to the tip (6).
The reaming process is carried out smoothly, and the drill part and the reamed part R do not interfere with each other. Further, since the drill groove (7) K is not clogged with chips, the cutting fluid is easily supplied smoothly to the tip (6), and sufficient lubrication and cooling effects are achieved. In this way, since both drilling and reaming are performed smoothly, restrictions on machining conditions are significantly relaxed.

In the above embodiment, the helix angle of the reamer blade was set to 4.
Although the angle is set in the range of 0 to 65 degrees, the best finished surface was obtained when the angle was set in the range of 45 to 50'. Furthermore, in order to better treat surface roughness on the finished surface, it was effective to use a stepped reamer in which the diameter of the reamer portion was increased stepwise from the side closer to the drill portion to the handle portion K. Although the above embodiment is for a through hole in which the length of the coal is longer than the length of the drill part, the present invention can also be implemented in a blind six-phase type with a shortened drill part. It can be said that the combination drill of the present invention, in which there is no mutual interference between the drill part and the reamer part, is suitable for blind hole machining in which drilling and machining are performed simultaneously.

As mentioned above, the present invention solves the problems in the prior art example, and has the features of the prior art example,
In other words, it is possible to obtain a combination drill which has the advantage of being able to perform high-precision hole drilling in one step in a short time, and which is easy to handle with fewer restrictions on processing conditions.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a side view, FIG. 2 is a front view, and FIG. 3 is a sectional view taken along the line ■-■ in FIG.
FIG. 4 is a partial plan view of the main part. (Ri...Combination drill, (6)...First 1
1M1, +7110. Drill groove, (8)...margin, (9)...second chamfer, (+1)...minor groove, (I
Uniform: Reamer blade, am: Reamer groove, D: Drill part, R: Reamer part, S: Handle part. Procedural amendment 1. , 711 indications 1982 Patent Application No. 78679 2, Title of the invention Combination drill 3, Relationship with the case of the person making the amendment Patent applicant 4/Attorney 530 8 Contents of the amendment Procedures Amendment document Attached application number Special Application No. 58-78679 (Reference No. 6)
From the last line of the page to the 3rd line of page 7, “Processing...
Appropriate. "Due to processing problems, the diameter was changed to 10.
, - For the thinner items, 4 threads, 10 parts φ and 20 cm -
Article 6, 20. - for diameters exceeding VC
#'iIt would be appropriate to make it Article 6 or more.0'' is corrected. that's all

Claims (1)

[Claims] (11) The drill part at the tip, the middle reamer part, and the handle part at the rear end are formed in series on the same axis, and the drill groove is continuous in one direction from the tip of the drill part to the entire length of the reamer part. A sub-groove is formed in a spiral shape, and is independent of the drill groove and parallel to the drill groove on the heel side of the portion corresponding to the land, and is formed over the entire length of the reamer portion from the tip of the drill portion. The reamer blade and reamer groove are formed spirally in the opposite direction to the drill groove from the leading edge side of the part corresponding to the land to the sub-groove K, and each reamer groove communicates with the sub-groove. A combination trill featuring