JP6697865B2 - Taper hole drilling tool - Google Patents

Description

  The present invention relates to a tapered hole machining tool that eliminates the problem of rapid wear of the cutting edge.

  The conventional technique for forming a tapered hole in a hole that has been machined in advance is to combine the backward movement and the lateral movement (radial direction of the cutter body) of this cutter after penetrating the body of the cutter into the prepared hole. A taper hole is formed in the pilot hole while moving (Patent Document 1).

JP 2001-277015 A

  By the way, according to the processing method of Patent Document 1, an inverted frustoconical body is integrally formed at the tip of the straight shank through a small-diameter neck portion at a position offset by a predetermined amount from the axis of the straight shank. It is necessary to have a special cutter that matches the shape of the processing taper hole in which a single cutting edge is formed, such as a so-called divergent linear sword according to the shape of the taper hole to be processed.

  Therefore, a cutter having a cutting edge that matches the peripheral hole slope shape of the taper hole is required each time the slope surface of the taper hole is changed. That is, there is a problem that a commercially available blade (chip) cannot be used.

  The cause is that the entire width of the tapered hole is made by one shot by the downward feed of the tool spindle with the forming cutting edge.

  In particular, in recent years, materials with high quenching hardness have been generally used in consideration of the life of processed products, so the life of the processing cutting edge (cutter) is a problem, that is, the surface of the cutting edge. Since the machining load on the entire width is large and the cutting speeds of the large diameter part and the small diameter part of the tapered hole are different, it is impossible to machine at the ideal cutting speed, and there is a problem that the wear of the cutting edge becomes faster.

  Then, this invention is providing the taper hole drilling tool which solved the above-mentioned problem.

In order to solve the above-mentioned problems, the present invention provides a casing that is connected to a machine tool in a non-rotating state via a positioning means, a bearing that pierces the center of the casing so as to rotate freely, and the above-mentioned machining tool. A main shaft provided to receive rotation transmission from the machine side, a transmission shaft parallel to the main shaft so as to freely rotate in the casing, and a main shaft provided to receive rotation transmission from the main shaft to the transmission shaft. Gears that mesh with each other, a feed male screw that is rotatably supported at a fixed position on the center line of the main shaft, a guide means that slides in the axial direction of the main shaft, and a pin A slide rod incorporated so as to be prevented from rotating with respect to the main shaft even if the feed male screw rotates, and a female screw provided so as to screw the feed male screw inward from the end face of the slide rod, A blade holder that slides by being guided by guide means along the angle of the finishing taper hole by a guide provided at the tip of the main shaft, a blade set at the low end of the blade holder, and the tip of the peripheral surface of the slide rod. A sloping surface portion provided so as to taper from the end to the tip, and a middle portion is rotatably supported in the tip of the main shaft via a support shaft, and the tip abuts on the sloping surface portion and ends at the blade holder. A lever engaged with the lever, a pressing means provided to the lever so that the tip of the lever is always in pressure contact with the inclined surface portion, and a deceleration transmission means provided to transmit the rotation of the transmission shaft to the feed male screw. The configuration consisting of and is adopted.

  The deceleration transmitting means is provided on the transmission shaft so as to mesh with the external and internal gears incorporated so as to rotate freely around the outer circumference of the feed male screw and the external teeth of the external and internal gears so as to transmit the rotation. The first gear, the second gear provided on the outer circumference of the feed male screw, and the plurality of positions in the main shaft are supported to mesh with the inner and outer teeth of the outer and inner gears to rotate the second gear. A configuration configured with a planetary gear provided so as to transmit may be adopted.

  As described above, according to the tapered hole machining tool of the present invention, the rotation of the transmission shaft from the gear is transmitted from the gear to the feed male screw by the rotation of the main shaft in one direction (normal rotation). Move the slide rod forward.

  Then, while the lever is rotated by the sloped surface of the slide rod that moves forward, the tool holder pushes out while guiding the tool holder according to the pressing force of the pressing means. It can be performed.

  Therefore, there is a peculiar effect that it is possible to process with a commercially available blade (tip) without processing the cutting edge into a special shape.

  When machining, the spindle rotation (peripheral speed during cutting) that is optimal for the blade and workpiece material conditions is set for machining, but this rotation is taken out to the slide part of the blade support holder using deceleration transmission means and is maintained at a constant speed. There is an effect that an optimum cutting amount can be given (without changing the cutting speed).

  Further, since the external and internal gears are used as the deceleration transmission means for taking out the rotation of the main shaft and rotating the feeding male screw, it is possible to take out with the two-stage gears, which has the effect of being compact.

It is a longitudinal section front view showing an embodiment of a taper hole drilling tool of the present invention. It is a longitudinal expansion front view which shows the principal part same as the above. It is a transverse plan view of the same. It is a vertical enlarged front view which shows the effect|action of a blade holder. It is a vertical cross-section enlarged front view which shows the taper hole of a workpiece|work.

Next, an embodiment of the present invention will be described with reference to the accompanying drawings.
1 to 3 of the embodiment is a casing which is connected to a machine tool A in a non-rotating state via a positioning means B, and a main shaft which is rotatably supported by a bearing 2 in the casing 1. 3 is penetrated.

  In the positioning means B, for example, as shown in FIG. 1, a protruding member 4 protruding from the outside of the casing 1 is provided with a recessed hole 5 having an open upper surface, and the recessed hole 5 has an upward protruding force. When the shaft member 7 with the spring 6 that gives the force is inserted and the main shaft 3 is set in the machine tool A, the tip of the shaft member 7 is inserted into the tapered hole 9 of the block 8 of the machine tool A while compressing the spring 6. The casing 1 is in a non-rotating state because of the engagement relationship.

  In addition, a piece 10 having a through hole 13 for the shaft member 7 protruding from the outer periphery of the casing 1 is provided, and a pin 12 rising upward from the projecting member 4 is passed through a hole 11 provided in the piece 10 to form a main shaft. The rotation prevention of the casing 1 with respect to 3 and the up-and-down movement of the shaft member 7 are guided.

  Further, when the casing 1 is connected to the machine tool A, the rotation is transmitted from the spindle a of the machine tool A to the spindle 3.

  For this rotation transmission, for example, as shown in FIG. 1, the tapered shank 15 at the base of the main shaft 3 is fitted into the tapered hole 14 of the spindle a.

  Further, a transmission shaft 16 which rotates freely in parallel with the main shaft 3 is supported in the casing 1, and a first gear 17 provided on the transmission shaft 16 has a main shaft 3 and an outer periphery thereof together with the main shaft 3. A rotating second gear 18 is provided.

Further, on the center line of the main shaft 3, there is provided a feed male screw 20 which is supported by a bearing 19 so as to freely rotate at a fixed position, and in the tip end side of the main shaft 3, an outer peripheral surface as guide means is provided. An axial vertical groove 21 and a slide rod 23, which is prevented from rotating with respect to the main shaft 3 by a pin 22 screwed from the outer peripheral surface of the main shaft 3 so that the tip is fitted in the vertical groove 21, and which slides in the vertical direction in the drawing. A female screw 24 is provided downward from the upper end surface of the slide rod 23, and the feed male screw 20 is screwed into the female screw 24.

  Further, the main shaft tip 48 (lower end in the figure) of the main shaft 3 slides while being guided by the guide means C along the angle of the tapered hole X (see FIG. 5) such as a valve seat provided in advance in the workpiece W. A blade holder 25 is provided.

As shown in FIGS. 1 and 2, the guide means C has a cover 26, which serves as a rail whose front end surface (lower end surface) is open, is attached to the front end (lower end) surface of the main shaft 3 through fixing means such as bolts. The blade holder 25 can be slid up and down by inserting the blade holder 25 inward from the opening of the front end surface of the cover 26.
When the angle of the tapered hole X changes, the spindle tip 48 corresponding to the angle is used.

  The cutting tool Y is supported at the tip (lower end in the drawing) of the tool holder 25 (this support is known as screw fixing and the description thereof is omitted).

  Further, there is provided a sloped surface portion 27 that tapers from the tip of the peripheral surface of the slide rod 23 toward the tip.

  Further, a hollow chamber 28 is provided in the tip of the main shaft 3, and the middle of the lever 29 is rotatably supported in the hollow chamber 28 via a support shaft 30, and the tip of the lever 29 is attached to the sloped surface portion 27. It abuts and the end of the lever 29 is engaged in the middle of the blade holder 25.

  In the illustrated case, the above engagement is provided by providing a recessed portion 31 in the blade holder 25 and inserting the end of the lever 29 into the recessed portion 31 to establish an engagement relationship.

  Further, the pressing means D is provided so that the tip of the lever 29 is always in pressure contact with the sloped surface portion 27.

  As the pressing means D, in the illustrated case, the slider 33 is fitted in the tubular portion 32, and one end of the tubular portion 32 abuts on the bottom of the tubular portion 32 and the other end abuts on the end of the slider 33. It is configured by incorporating the spring 34.

  Then, the tip of the slider 33 is pressed against the tip of the lever 29, and the tip of the lever 29 can be constantly pressed against the sloped surface 27 in a stable state.

  Further, the rotation of the transmission shaft 16 is transmitted to the feed male screw 20 via the reduction transmission device E constituted by a combination of gears.

  Reference numeral 36 in the figure denotes a pin which allows the user to visually confirm the position of the slide rod 23, and the position of the elongated hole 35 can be confirmed.

  With the above configuration, the transmission shaft 16 is driven by the first gear 17 from the second gear 18 in accordance with the one-way rotation (normal rotation) of the main shaft 3, and then the transmission shaft 16 is decelerated by the deceleration transmission means E to move the feed screw 20. drive.

  Then, the slide rod 23 having the threaded female screw 24 of the feed male screw 20 is fed down, and the lever 29 is rotated (swinged) in the clockwise direction in FIGS.

  Then, since the blade holder 25 is pushed out as shown in FIG. 4 by the movement of the tip of the lever 29, the tapered hole X of the work W is cut by the blade Y as shown in FIG.

After the cutting is completed, the slide rod 23 is raised by the above-described reverse operation in accordance with the other direction rotation (reverse rotation) of the spindle 3, and the blade holder 25 is moved in accordance with the counterclockwise rotation (swing) of the lever 29. Push back (as shown in Figure 1).
Reference numeral 38 in the figure denotes a fitting hole for the slide rod 23.

Next, the structure of the deceleration transmission means E will be described with reference to FIGS.
A freely rotating outer/internal gear 41 mounted on the outer periphery of the feed male screw 20, and a meshing first gear 43 provided on the transmission shaft 16 so as to transmit the rotation to the outer teeth 42 of the outer/internal gear 41, A planetary gear which is supported at a plurality of positions in the main shaft 3 via a support shaft 45 with a second gear 44 provided on the outer circumference of the external male screw 20, and meshes with the inner teeth 46 and the outer teeth 42 of the outer and inner gears 41. The gear 47 and the gear 47 constitute the deceleration transmission means E.
The number of teeth of the inner teeth 46 is smaller than the number of teeth of the outer teeth 42.

  Then, since the external and internal gears 41 are used for decelerating the rotation of the main shaft 3 and the rotation of the feed male screw 20, the external gear and the internal gear 41 can be taken out by two-stage gears, which is extremely compact.

A Machine tool a Spindle B Positioning means C Guide means D Pressing means E Deceleration transmitting means W Workpiece X Taper hole Y Tool 1 Casing 2 Bearing 3 Main shaft 4 Protruding member 5 Recessed hole 6 Spring 7 Shaft 8 Block 9 Taper hole 10 Piece 11 hole 12 pin 13 through hole 14 taper hole 15 taper shank 16 transmission shaft 17 first gear 18 second gear 19 bearing 20 male screw 21 vertical groove 22 pin 23 slide rod 24 female screw 25 cutter holder 26 cover 27 sloped surface 28 Hollow chamber 29 Lever 30 Support shaft 31 Recessed portion 32 Cylindrical portion 33 Slider 34 Spring 41 Outer/internal gear 42 Outer teeth 43 First gear 44 Second gear 45 Support shaft 46 Inner teeth 47 Planetary gear 48 Spindle tip

Claims (2)

A casing that is connected to the machine tool in a non-rotating state via a positioning means, and a spindle that is pierced through the center of the casing so as to rotate freely and that receives a rotation transmission from the machine tool side. , A transmission shaft that is supported so as to rotate freely in the casing in parallel with the main shaft, a meshing gear that is provided to receive rotation transmission from the main shaft to the transmission shaft, and a fixed gear on the center line in the main shaft. A male screw threaded so as to rotate freely at any position, and a guide means that slides in the axial direction of the spindle shaft in the tip side of the spindle shaft, and even if the pin rotates the male screw thread, The slide rod that is installed so that it will not rotate, the female screw that is provided so as to screw the feed male screw inward from the end face of this slide rod, and the guide that is provided at the tip of the main shaft A blade holder that slides along an angle guided by guide means, a blade set at the lower end of the blade holder, and a sloped surface portion provided so as to taper from the tip of the peripheral surface of the slide rod to the tip. And a lever that rotatably supports the middle in the tip of the main shaft via a support shaft, abuts the tip to the sloped surface portion, and engages the end of the blade holder with the end, and the lever has the sloped surface portion. A taper hole drilling tool comprising: a pressing means provided so that the tip of the lever is always in pressure contact with the deceleration transmission means; and a deceleration transmission means provided so as to transmit the rotation of the transmission shaft to the feed male screw.   The deceleration transmitting means is provided on the transmission shaft so as to mesh with the external and internal gears incorporated so as to rotate freely around the outer circumference of the feed male screw and the external teeth of the external and internal gears so as to transmit the rotation. One gear, a second gear provided on the outer circumference of the feed male screw, and bearings at a plurality of positions in the main shaft to mesh with the inner and outer teeth of the outer and inner gears to transmit rotation to the second gear. The taper hole drilling tool according to claim 1, wherein the tool is formed of a planetary gear thus provided.

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