JPH0512020U - Gun drill - Google Patents

Abstract

(57) [Summary] [Objective] To obtain a gun drill capable of significantly reducing the production cost by suppressing the production and management costs of the pipe-shaped member. A rear end portion of a pipe-shaped member 26 having the same cross-sectional shape formed over the entire length and a V-shaped groove formed on the outer peripheral portion is fitted into the inner diameter portion of the driver 24 on the front end side. . Further, a block 32 having a fan-shaped cross section is fitted into the gap formed in the V-shaped groove. And driver 2
4. The pipe-shaped member 26 and the block 32 are brazed and fixed so as to be integrated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gun drill capable of significantly reducing the production cost by suppressing the production and management costs of a pipe-shaped member which is a so-called shank of the gun drill.

[0002]

[Prior Art]

 A gun drill as shown in FIGS. 7 to 9 is conventionally known as a tool used when deep-drilling a work material. The gun drill shown in these figures has a pipe-shaped member 2 which is a so-called shank, a cutting edge tip 4 which is coaxially joined to the tip of the pipe-shaped member 2, and a coaxial end of the pipe-shaped member 2. And a substantially cylindrical driver 6 joined to the.

Here, the pipe-shaped member 2 is formed to have a slightly smaller diameter than the cutting blade tip 4 so that the outer peripheral surface 2 a thereof does not protrude from the outer peripheral surface 4 a of the cutting blade tip 4. Further, on the outer peripheral surfaces 4a, 2a from the tip of the cutting blade tip 4 to the base end side of the pipe-shaped member 2, a groove portion 8 having a substantially constant groove width W and a substantially V-shaped cross section is formed. A cutting edge 14 is formed at the ridge between the wall surface 10 of the groove 8 facing the rotation direction and the tip flank 12 of the cutting edge tip 4. Further, inside the cutting blade tip 4, an oil hole 18 communicating with the hollow portion 16 of the pipe-shaped member 2 and opening to the tip flank 12 of the cutting blade tip 4 is formed.

In the gun drill configured as described above, the high-pressure cutting oil supplied from the base end of the driver 6 passes through the hollow portion 16 of the pipe-shaped member 2 and the oil hole 18 of the cutting blade tip 4 to be oiled. By being discharged from the opening of the hole 18 toward the front of the tool, the chips generated by the cutting blade 14 are guided to the groove 8 and discharged to the base end side of the pipe-shaped member 2.

[0005]

[Problems to be solved by the device]

 By the way, as shown in FIG. 10, the pipe-shaped member 2 in the above-described conventional gun drill has a cylindrical round portion 20 located at the base end side of the pipe-shaped member 2 and having no groove portion 8 formed therein. The molding portion 22 is continuous with the round portion 20 and has a groove portion 8 formed on the outer peripheral surface (outer peripheral portion). The tip of the driver 6 and the pipe-shaped member 2 are joined to each other by fitting the inner half of the driver 6 with the majority of the round portion 20 and brazing the two members together. .

In the conventional candrill using such a pipe-shaped member, when manufacturing a gun drill having a shank length required for processing, the round length and the forming portion length satisfying the processing conditions are set. Using a pipe-shaped member that has one or both of the length of the round part and the length of the formed part that is longer than the required length, cut into a length that satisfies the processing conditions. The gun drill is manufactured by joining the round part to the driver and the end of the forming part to the cutting edge tip. For this reason, in order to use a gun drill according to various processing conditions, it is necessary to manufacture, store, and manage many types of pipe-shaped members with different round lengths and forming lengths. The cost required to manufacture, store, and manage the strip-shaped member is high, and it has been desired to reduce this cost.

The present invention has been made based on the above technical background, and provides a gun drill capable of significantly reducing the production cost by suppressing the production and management costs of the pipe-shaped member. The purpose is to

[0008]

[Means for Solving the Problems]

 According to this invention, the rear end portion of a pipe-shaped member having the same cross-sectional shape over the entire length and a groove formed in the outer peripheral portion is inserted into the inner diameter portion of the tip end side of a substantially cylindrical driver and joined. The gap formed between the inner diameter portion of the driver and the outer peripheral portion of the pipe-shaped member is filled with a filling material, and the gap is formed at the tip of the pipe-shaped member inside the hollow portion of the pipe-shaped member. A cutting blade tip having an oil hole communicating therewith and having a groove continuous with the groove formed in the outer peripheral portion of the pipe-shaped member is joined to the outer peripheral portion.

[0009]

[Action]

 In the gun drill having the above structure, a long pipe-shaped member having the same cross-sectional shape is cut into a required length, and a cutting blade tip is attached to one end of this pipe-shaped member. A gun drill is manufactured by joining a driver to the other end and filling a gap formed between the outer peripheral portion of the pipe-shaped member and the inner diameter portion of the driver with a filler.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. In these drawings, reference numeral 24 is a driver similar to the above-mentioned conventional example, and reference numeral 26 is a pipe-shaped member which is a shank.

The pipe-shaped member 26 has the same cross-sectional shape over the entire length, a V-shaped groove 28 is formed on the outer peripheral portion thereof, and the hollow portion 30 has a crescent shape. .

A cutting edge tip similar to the cutting edge tip 4 shown in the above-mentioned conventional example is brazed and fixed to one end side (tip side) (not shown) of the pipe-shaped member 26. The other end side (rear end side) of the pipe-shaped member 26 is fitted into the inner diameter portion of the tip end of the driver 24 after the block 32 having a fan-shaped cross section shown in FIG. As a result, the hollow portion 24a of the driver 24 and the hollow portion 30 of the pipe-shaped member 26 are communicated with each other. The driver 24, the block 32, and the pipe-shaped member 26 are brazed and fixed so as to be integrated.

In the gun drill having the above structure, unlike the gun drill shown in the above-mentioned conventional example, the pipe-shaped member 26 does not have a round portion but is entirely formed by a molded portion. Therefore, in the gun drill according to the present embodiment, a long pipe-shaped member having the same cross-sectional shape is cut into a length according to the processing conditions, and a cutting edge chip and If the drivers are joined to each other, it is possible to easily obtain a gun drill having a length according to the processing conditions. Therefore, it is not necessary to manufacture, store, and manage many types of pipe-shaped members with different round lengths and molding lengths as in conventional gun drills, and long pipe-shaped members with the same cross-sectional shape. It is enough to prepare only. Therefore, the cost for producing, storing, and managing the pipe-shaped member can be suppressed, and the production cost of the gun drill can be significantly reduced.

The joining mode of the driver 24 and the pipe-shaped member 26 is not limited to the one shown in the above embodiment, and as shown in FIG. 4, for example, the driver 24 is attached to the outer periphery of the tip end side of the driver 24. A screw hole 34 that communicates the inside and the outside is formed, and the driver 24 and the pipe-shaped member 26 are fixed by a screw member 36 that is screwed into the screw hole 34, and then both members are brazed together to form a gap between both members. 38 may be filled with resin or the like. Further, as shown in FIG. 5, the gap between the driver 24 and the pipe-shaped member 26 may be filled with a filling adhesive to join the two members.

In the case of the above-mentioned configuration, the strength (hardness) of the block, resin, filling adhesive, etc. to be filled in the gap between the driver and the pipe-shaped member is adjusted or the tightening of the screw member is performed. By adjusting the strength or the brazing strength, the rigidity of the tool can be made moderate.

Further, as shown in FIG. 6, if a part 42 a of the filler 42 to be filled in the gap between the driver 24 and the pipe-shaped member 26 is projected outward along the pipe-shaped member 26, the tool rigidity is increased. By increasing the number of the protrusions 42a and further inclining the tip of the protrusion 42a (see FIG. 6), it is possible to improve the chip discharge property during the cutting process.

[0017]

[Effect of the device]

 As described above, according to the present invention, the pipe-shaped member has the same cross-sectional shape over its entire length, and the gap between the joint between the pipe-shaped member and the driver is filled with the filling material. Since a long pipe-shaped member with the same cross-sectional shape is cut to a length according to the processing conditions and the cutting edge tip and driver are joined to this pipe-shaped member, respectively It is possible to easily obtain a gun drill, which can reduce the production cost and management cost of the pipe-shaped member, and can significantly reduce the gun drill production cost.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view of a gun drill according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line BB in FIG.

FIG. 3 shows block 32 in FIGS. 1 and 2,
(A) is a side view and (b) is a front view.

FIG. 4 is a partial cross-sectional side view of a gun drill according to another embodiment of the present invention.

FIG. 5 is a partial sectional side view of a gun drill according to another embodiment of the present invention.

FIG. 6 is a partial cross-sectional side view of a gun drill according to another embodiment of the present invention.

FIG. 7 is a side view showing a conventional gun drill.

FIG. 8 is a front view of the same.

FIG. 9 is a sectional view perpendicular to the axis of a pipe-shaped member of the gun drill.

FIG. 10 is a partial cross-sectional side view of the gun drill.

11 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 24 Driver 26 Pipe-shaped member 32, 38, 40, 42 Filling material

Claims (1)

[Scope of utility model registration request] 1. A substantially cylindrical driver has a tip side inner diameter portion,
The rear end side portion of the pipe-shaped member having the same cross-sectional shape over the entire length and having the groove formed in the outer peripheral portion is inserted and joined to the inner diameter portion of the driver and the outer peripheral portion of the pipe-shaped member. A gap formed between the pipe-shaped member is filled with a filler, an oil hole communicating with the hollow portion of the pipe-shaped member is formed inside the tip of the pipe-shaped member, and an outer peripheral portion of the pipe-shaped member is formed in the outer peripheral portion. A gun drill, characterized in that a cutting blade tip having a continuous groove is joined to the groove formed in (1).