JP2007160472A5 - - Google Patents

Description

Glasses hole cutting method and cutting apparatus

  The present invention relates to a method and an apparatus for cutting a spectacle hole in which two holes having the same or different hole diameters are decentered by a predetermined distance and overlap each other.

  FIG. 11 exemplifies an extrusion cylinder of a molding machine, and has a spectacle hole W in which two holes A and B having the same hole diameter are decentered and overlap each other by a predetermined distance e. A conventional cutting method for cutting such a spectacle hole W is shown in FIGS.

  That is, in the conventional method, first, as shown in FIGS. 10 (a) and 10 (b), two holes A and B are formed on a work material M made of a required metal material by a deep hole cutting drill. One hole (first hole) A is cut. Next, the padding G is inserted into the cut first hole A as shown in (c). The padding G is formed in a rod shape that fits tightly into the hole A with the same or different metal material as the work material M. Thereafter, a second hole B, which is another hole having a center at a position deviated by a predetermined distance e from the center of the first hole A into which the filling G is inserted, is cut with a deep hole cutting drill ( (See (d)). After cutting the second hole B in this manner, the padding G ′ (a state in which the padding G is partially cut) is extracted from the first hole A, thereby forming a spectacle hole W as shown in FIG. .

  According to the conventional cutting method as described above, the padding G ′ is extracted from the first hole A after the metal pad G to be inserted into the first hole A, the fitting operation, and the cutting of the second hole B. There is a problem that it takes a lot of work and time to work, and the manufacturing cost of the product having the eyeglass hole W is very high.

  An object of this invention is to provide the cutting method and apparatus which can form the eyeglass hole W simply and easily in view of said subject.

Means for solving the above problems will be described with reference numerals of the embodiments described later. In the invention according to claim 1, the two holes A and B of the first hole A and the second hole B are predetermined. A method of cutting a spectacle hole W that is overlapped with an eccentric distance,
A drill head 6 is attached to a rotating inner boring bar 5 so as to be integrally rotatable, and a substantially crescent-shaped hole guide 7 supported so as to be relatively rotatable on the outer periphery of the drill head 6 is fitted to the inner boring bar 5. It is provided with a guided drill 2 connected to an outer rotating boring bar 11 that can move in the axial direction integrally therewith,
The first hole A is cut first in the work material M, and then the guide 7 is fitted to the first hole A while the hole guide 7 of the guided drill 2 is fitted and slidably guided along the first hole A. The second hole B is cut by the drill head 6 of the drill 2.

The invention according to claim 2 is an apparatus for carrying out the eyeglass hole cutting method according to claim 1,
A drill head 6 for cutting the second hole B is attached to the inner boring bar 5 that is rotationally driven so as to be integrally rotatable, and a cross section that can be fitted into the first hole A supported on the outer periphery of the drill head 6 so as to be relatively rotatable. A drill 2 with a guide formed by connecting a substantially crescent-shaped hole guide 7 to a non-rotating outer boring bar 11 which is fitted into the inner boring bar 5 and can move axially integrally therewith;
It is characterized by comprising mechanisms 28, 29, and 30 that transmit the rotation from the rotational drive source to the inner boring bar 5 while holding the outer boring bar 11 so as not to rotate.

According to a third aspect of the present invention, in the eyeglass hole cutting device according to the second aspect, a cylindrical guide mounting member 8 is fitted to the drill head 6 of the guided drill 2 so as to be relatively rotatable. A hole guide 7 having a substantially crescent-shaped cross section is attached, and the guide attachment member 8 is attached to an outer boring bar 11 .

  The effect of the invention by the above solution will be described with reference numerals of the embodiments described later. The cutting method of the invention according to claim 1 is an operation for producing the filling G as in the conventional method. Is not required to be inserted into the first hole A, and further, the operation of extracting the filling G from the first hole A after the formation of the second hole B is unnecessary, and the hole of the guided drill 2 is inserted into the previously formed first hole A. Since the second hole B is cut by the drill head 6 while the guide 7 is fitted and slidably guided along the first hole A, the eyeglass hole W is formed in a much shorter time than the conventional method. Moreover, it can be cut and formed accurately.

  According to the invention which concerns on Claim 2, the cutting method of the spectacles hole of Claim 1 can be implemented effectively.

According to the invention of claim 3, in order to support the hole guide 7 on the outer periphery of the drill head 6 so as to be relatively rotatable, the cylindrical guide mounting member 8 is fitted to the drill head 6 so as to be relatively rotatable. Since the hole guide 7 is attached to the attachment member 8 and the guide attachment member 8 is attached to the outer boring bar 11 , the hole guide 7 can be accurately supported in a stable state with respect to the drill head 6.

  A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 (a) is a side view of a normal drill 1 used for deep hole cutting, and FIG. FIG. 2A is a side view of the guided drill 2 used in the cutting method of the present invention, and FIG. 2B is an end view of the guided drill 2 as viewed from the front end side. 3A is a partially sectional side view showing a drive system of the drill 1, and FIG. 3B is a partially sectional side view showing a drive system of the drill 2 with guide. 4 is an enlarged perspective view of the guided drill 2, and FIG. 5 is an enlarged side view of the guided drill 2.

The method for cutting a spectacle hole according to an embodiment of the present invention has a substantially crescent-shaped cross section in which a drill head 6 is attached to a rotating inner boring bar 5 so as to be integrally rotatable, and is supported on the outer periphery of the drill head 6 so as to be relatively rotatable. The hole guide 7 is connected to the non-rotating outer boring bar 11 fitted to the inner boring bar 5 and axially movable together with the bar 5 via a guide mounting member 8. As shown in FIGS. 9 (a) to 9 (c), first, the first hole A is cut into the work material M, and the cut first drill A is provided. The above-mentioned substantially crescent-shaped hole guide 7 of the guided drill 2 is fitted into the hole A and the second hole B is cut by the drill head 6 of the guided drill 2 while sliding along the first hole A. To do Than is.

  The drill 1 shown in FIG. 1 is a well-known drill used for cutting the first hole A in the cutting method of the present invention, and the drill head 4 has a substantially cylindrical shape having a hollow portion 41 whose base end side is open. In addition, chip discharge ports 42 and 43 are provided on the front end surface side, cutting edges 44, 45 and 46 are attached to the opening side edge portions, and guide pads 47 and 48 are attached to the outer peripheral surface. The drill head 4 is attached with a male screw 49 provided on the outer periphery on the base end side by screwing it into the tip end of the boring bar 3, and the rear end of the boring bar 3 is shown in FIG. A deep hole is formed by cutting the work material by being connected to a rotational drive shaft of a machine tool through the chuck mechanism 50 and driven to rotate.

The drill head 6 used for cutting the second hole B in the cutting method of the present invention is substantially the same as the ordinary drill head 4 shown in FIG. 1, and is shown in FIGS. Thus, it is the substantially cylindrical shape which has the hollow part 31 with which the base end side was open | released, Comprising: The chip | tip discharge ports 12 and 13 are provided in the front end surface side, and the cutting blades 14, 15, and 16 are in the opening side edge part. The drill head 6 is screwed with a male screw 19 provided on the outer periphery on the base end side into a female screw 5 a at the tip end of the inner boring bar 5. Can be attached. 6 shows the drill head 6 in a state where the cutting blades 14, 15, 16 and the guide pads 17, 18 are not attached.

Hole guide 7 of the cross section crescent, 2, 4, as can be seen FIGS. 5 and 7 or, et al., Which causes the axial direction slidably fitted in the first hole A formed previously on the workpiece M 2 has an outer peripheral surface 20 and an inner peripheral surface 21 (see FIG. 4) having the same diameter as the outer diameter of the drill head 6, and can be rotated relative to the outer periphery of the drill head 6 as shown in FIG. The center Oa of the hole guide 7 is attached so as to be eccentric from the center Ob of the drill head 6 by a predetermined distance e. Then, six guide pads 22 are attached to the outer peripheral surface 20 of the hole guide 7, for example, three in the circumferential direction and two in the axial direction. The hole guide 7 may be formed so as to be able to fit into the first hole A formed in the work material M.

  The guide mounting member 8 for mounting the hole guide 7 is formed in a cylindrical shape. As shown in FIGS. 2, 4, 5, and 8, a drill having a large-diameter head 6a and a shaft 6b. The shaft 6b (see FIG. 6) of the head 6 is fitted so as to be relatively rotatable via an oil-free bush 23 (see FIG. 5). As can be seen from FIG. 8, the guide mounting member 8 is formed with a guide mounting cylindrical portion 8a having the same outer diameter as the large-diameter head 6a of the drill head 6 on the tip side, and a male screw 8b on the outer periphery of the rear end. The guide pad 26 is attached to the cylindrical portion 8a at a plurality of locations in the circumferential direction. In FIG. 8, reference numeral 27 denotes a recess for attaching the guide pad 26.

In order to attach the hole guide 7 to the drill head 6, first, the guide attaching member 8 is first fitted on the shaft portion 6 b side of the drill head 6 via the oilless bush 23, and the inner peripheral surface 21 of the hole guide 7. The rear end side is engaged with the guide mounting cylindrical portion 8 a of the guide mounting member 8, and a bolt (not shown) is screwed into the screw hole 25 of the guide mounting member 8 from the bolt insertion hole 24 of the hole guide 7. Then, the hole guide 7 is fixed to the guide mounting member 8 by fastening, and the state shown in FIGS. 4 and 5 is obtained. In this case, the hole guide 7 fits into the first hole A formed earlier and guides the drilling of the second hole B to be formed later. As can be seen from FIGS. 4 and 5, It is necessary to fix the hole guide 7 to the guide mounting member 8 so that the tip of the hole guide 7 protrudes the required length from the tip of the drill head 6.

The guide mounting member 8 is supported so as to be rotatable relative to the drill head 6, and the male screw 8 b provided on the outer periphery of the rear end of the guide mounting member 8 is rotated relative to the inner boring bar 5. capable to screwing on the tip side female threaded 11 a of the outer boring bar 11 which is fitted around and integrally connected to the guide attaching member 8 to the outer boring bar 11 (in (a) refer to FIG. 2).

Then, as shown in (b) of FIG. 3, the rear end portion 11 b of the outer boring bar 11 is fixed by a chuck 29 on the fixed base 28, after the inner boring bar 5 which is inserted into the outer boring bar 11 The end portion 5b is linked to a rotational drive shaft of the machine tool via a rotation transmission member 30 rotatably held by the fixed base 28. Accordingly, the drill head 6 is rotated by rotationally driving the inner boring bar 5 by the rotation drive shaft or the like, but the hole guide 7 is connected to the guide mounting member 8 integrally connected to the non-rotating outer boring bar 11. It is in a fixed state.

  A method of cutting the eyeglass hole W using the guided drill 2 according to the present invention as described above will be described below with reference to other drawings as appropriate with reference to FIG.

  First, as shown in FIGS. 9 (a) and 9 (b), the first hole A is cut through the work material M made of a required metal material by the deep hole cutting drill 1 shown in FIG. To do.

When the first hole A is thus formed in the work material M, the tip of the crescent-shaped hole guide 7 of the guided drill 2 is fitted into the first hole A, that is, the outer periphery of the tip of the hole guide 7. With the surface 20 engaged with the inner peripheral surface of the first hole A, the drill head 6 of the guided drill 2 is pressed against the end surface side of the work material M in this state, and the inner boring bar 5 is driven to rotate. While the inner boring bar 5 and the non-rotating outer boring bar 11 are moved forward together, the hole guide 7 is slidably guided along the first hole A, and the drill hole 6 is rotated to rotate the second hole. by slide into cut B, as shown in (c) of FIG. 9, to form a glasses hole W consisting of a second hole B which is cut formed after the first hole a previously formed.

  When the cutting method according to the present invention as described above is compared with the conventional cutting method described with reference to FIG. 10, in the conventional method, the padding G is inserted into the first hole A previously formed in the work material M. Therefore, the manufacturing method of the filling G, the fitting insertion packing operation, and the operation of extracting the filling G from the first hole A after the cutting formation of the second hole B are required, whereas in the method of the present invention, Since these operations are unnecessary, the eyeglass hole W can be precisely cut in a much shorter time than the conventional method.

  In the above-described cutting method according to the embodiment, the case where the hole diameter of the first hole A and the hole diameter of the second hole B are the same has been described. However, the cutting method of the present invention includes the first hole A and the second hole B. The present invention is also applied when the hole diameters of the holes B are different. Moreover, in this embodiment, although the 1st hole A was formed with the drill 1 for a normal deep hole cutting conventionally used, when the 1st hole A and the 2nd hole B are the same diameter, The first hole A is formed by a drill comprising the drill head 6 from which the hole guide 7 and the guide mounting member 8 are removed from the guided drill 2 according to the present invention and the inner boring bar 5 to which the drill head 6 is attached. You can also.

Further, according to the guided drill 2 configured as shown in FIGS. 2, 4, and 5, the drill head 6 has a cylindrical shape so that the hole guide 7 is supported on the outer periphery of the drill head 6 so as to be relatively rotatable. The guide mounting member 8 is fitted so as to be relatively rotatable, and the hole guide 7 is mounted on the guide mounting member 8 and the guide mounting member 8 is mounted on the outer boring bar 11 , so that the hole guide 7 is drilled. The head 6 can be accurately supported in a stable state.

(a) is the side view of the drill 1 normally used for cutting a deep hole, (b) is the end view which looked at the drill 1 from the front end side. (a) is a side view of the drill 2 with a guide used for the cutting method of this invention, (b) is the end view which looked at the drill 2 with a guide from the front end side. (a) is a partial cross-sectional side view showing the drive system of the drill 1, and (b) is a partial cross-sectional side view showing the drive system of the drill 2 with guide. It is an expansion perspective view of the drill 2 with a guide. It is an enlarged side view of the drill 2 with a guide. The drill head 6 of the drill 2 with a guide is shown, (a) is a side view of the drill head 6 in a state where the cutting blade and the guide pad are not attached, and (b) is an end view thereof. The hole guide 7 of the drill 2 with a guide is shown, (a) is a side view of the hole guide 7 in a state where the guide pad is not attached, and (b) is the center Oa from the state shown in (a). (C) is an end view of the hole guide 7 shown in (b) as viewed from the front end side. The guide attachment member 8 of the drill 2 with a guide is shown, (a) is a side view of the guide attachment member 8 in a state where the guide pad is not attached, (b) is a sectional view taken along line XX of (a), (c ) Is a side view when the guide mounting member 8 is rotated 90 ° around the central axis from the state shown in (a), and (d) is an end view of the guide mounting member 8 shown in (c) as viewed from the front end side. is there. (a)-(c) is a schematic process drawing explaining the cutting method of this invention. (a)-(e) is a schematic process drawing explaining the conventional cutting method. It is a perspective view which shows the extrusion cylinder of the molding machine which has the spectacles hole W. FIG.

Explanation of symbols

M Work Material W Glasses Hole A Glasses Hole First Hole B Glasses Hole Second Hole 2 Guided Drill 5 Inner Boring Bar 6 Drill Head 7 Hole Guide 8 Guide Mounting Member
11 Outer boring bar