JPS6085825A - Cutter for spiral grooving - Google Patents

Abstract

PURPOSE:To make such a specially formed spiral groove as being unequal in a lead angle cuttable in a simple and highly accurate manner, by installing a lot of cutting edges being dislocated in order by (n) pieces at regular intervals and each 1/n pitch in the circumferential direction, in the peripheral part of a cylindrical cutter. CONSTITUTION:A cutter 10 for cutting, for example, a spiral groove to be installed in the peripheral part of an intermittent feed parts is constituted of a cylindrical body 11 consisting of a carbon steel or the like, by way of example, and a lot of cutting edges 13 consisting of cemented barvide metals, etc. And, each of these cutting edges 13 is one installing (n) pieces in the circumferential direction in many rows continuously, and adjacent cutting edges 13 are dislocated in order by each 2pi/n radian in the circumferential direction, besides by each 1/n pitch in the axial direction of the cylinder body 11. According to this cutter, such a spiral groove as being unequal in a lead angle can be machined yet speedier and easier in a highly accurate manner as compared with that machined by a numerically controlled lathe and/or a special tread cutting lathe.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a cutter suitable for cutting, for example, a spiral groove provided on the outer periphery of an intermittent feed component.

[Background of the invention]

Conventionally, there has been an intermittent feed mechanism that uses a threaded member provided with a spiral groove on the outer periphery of the shaft, and rotates this threaded member through a predetermined angle to reciprocate a movable member that is engaged in the spiral shape by a predetermined distance. Are known.

FIG. 1 is a schematic configuration diagram of such an intermittent feeding mechanism, with 1
is a stepping motor, 2 is a bearing, 3 is a rotating connection member,
4 is a screw member, 5 is a guide bar, 6 is a moving part, 7 is a plate, 8 is a tip ytAt part, and 9 is a spiral front.

A spiral groove 9 is formed on the outer periphery of the screw member 4, which is an intermittent feeding component.
is formed, and one end of this threaded portion 4 is connected to the stepping motor l via the rotational connecting member 3, and
The other end is supported by a bearing 2. The guide bar 5 is installed parallel to the screw member 4.

A movable member 6 is slidably fitted into the guide bar 5, and a pointed end 8 provided at the lower end of the movable member 6 via a spring 7 fits into the helical groove 9 of the screw member 4. It is slidably inserted.

When it is desired to intermittently feed the movable member 6 at a predetermined pitch beside the feed bale, the stepping motor 1 is intermittently energized to intermittently rotate the screw member 4 forward, thereby moving the movable member 6 to the guide bar. 5 within a predetermined range.

By the way, the screw member 4, which is a conventional intermittent feeding component used in this rod feeding mechanism, has a spiral groove 9 whose advance angle θ is the same K over the entire circumference, as shown in the unfolded state in FIG. Since the threads are threaded so that the threads are threaded, the soft f61 can be machined simply and with high accuracy by using a thread cutting lathe or the like. However, one example is θ°, 45°, 90°, 135°, 180° of rotation angle of screw member 40.
When it is desired to intermittently stop the movement of the movable member 6 at eight locations of °, 225°, 270°, and 315°, due to fluctuations in the rotation angle of the screw member 4 or (b) rotational deviation K, In comparison to this, the position of the moving member 6 also shifts,
There were problems with reliability as it sometimes did not stop at the correct position. In addition, as mentioned above, since feed amount errors tend to occur due to rotation flill (f141 deviation) of the stepping motor 1, in order to reduce this error, it is necessary to use a highly accurate, that is, an expensive stepping motor, or It may be possible to use a special screw member with a modified advance angle θ of the klQ spiral groove 9, or the use of an expensive stepping motor is a cost disadvantage.
Furthermore, machining a specially shaped spiral groove requires an NC lathe, a special thread cutting lathe, etc., which also poses the problem of resulting in an expensive intermittent feed part.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a cutting cutter that can easily process a special-shaped spiral groove with uneven advance angles at a high rate, while eliminating the drawbacks of the prior art described above.

[Summary of the invention]

To achieve this objective, the present invention provides n pieces arranged on the outer circumference of a cylindrical cutter at equal intervals in the circumferential direction and one cutter in the axial direction. -The cutter is characterized by a large number of cutting blades that are offset by one shell, giving this cutter a rotary cutting motion in the same direction as the workpiece, so that the cutter has an uneven advance angle on the outer circumference of the workpiece. A spiral groove is formed.

[Embodiments of the invention]

Hereinafter, five embodiments of the present invention will be described in detail with reference to FIGS. 3 to 11.

FIG. 3 is a side view showing an embodiment of a cutting cutter according to the present invention, and FIG. 4 is a front view of the cutter. The cutter IO consists of a cylindrical body 11 made of, for example, carbon steel and a number of cutting blades 13 made of cemented carbide metal.
2. It is accurately fixed to a predetermined position on the outer circumference of the cylinder 11 by means such as a resistive layer. A mounting hole 12 with a keyway 12a is provided at the center of the cylindrical body 11, and the cutting edge 13 has a KUr face chevron shape as shown in FIG. 5, and its top has a slightly linear shape. It becomes.

Each of the cutting blades 13 is continuously provided in multiple rows of n pieces in the circumferential direction, and the adjacent cutting blades 13 are arranged in the circumferential direction Vci! of the joint body 11! - radians and one pitch in the axial direction of the segment body 11. FIG. 6 is an explanatory view showing the state in which the cutter 10 is unfolded in the axial direction, and as is clear from this figure, in this embodiment, one
The eight cutting blades 13 that are shifted by the Kasama machining of degrees (i-radians) are slid one pitch at a time in the axial direction, and these eight cutting blades 1
There are 12 rows, a to l, with number 3 as one row. Therefore, 1
The first cutting edge a in the row and the second cutting edge a2 are offset by 45 degrees in the circumferential direction and axial direction Ki, and similarly, the eighth cutting edge in the first row A8 and the first cutting edge 1 and b of the second row are also offset by 45 degrees in the circumferential direction and i hit in the axial direction, 12
The cutting edge of the 8th #i-th cutting edge in the second row is rubbed in the same manner.

7 and 8 are side views of the cutting state using the cutter IO described above, and 14 indicates a workpiece. The workpiece 14 is a round bar having the diameter of the seedling of the cutter 10, and the relationship between the workpiece 14 and the cutter 10 is as follows.

Both are rotated counterclockwise with a rotation ratio of 1:1.

Now, as shown in Fig. 8, cutter to and workpiece 1
4 is rotated in the direction of the arrow at an equal rotation ratio of 1=1, and the cutter io is sent a predetermined distance toward the center of the workpiece 14, the contact locus between the cutting edge of the cutting blade 13 and the workpiece 14 becomes approximately a straight line. The workpiece 14 is cut in the shaded area. From this K, a V-shaped groove having the same cross-sectional shape as the cutting blade 13 is formed on the outer circumference of the workpiece 14, but this groove is parallel to the vertical MK that is orthogonal to the axis of the workpiece 14. It is.

Since the cutter 10 and the workpiece 14 have different diameters, their respective local parts rotate in the direction of the arrow at different circumferential speeds.Therefore, next, the cutting edge a starts a contact trajectory with the flame-processed workpiece 14, and the workpiece The object 14 is cut along a straight line (indicated by a two-dot chain line) that makes an angle of 135 degrees with the previously cut straight line to form a new V-shaped groove. This new groove and the previous groove are shifted by a pitch Kj in the axial direction of the workpiece 14, since the cutting edges a and a are shifted by a pitch Kj in the persimmon direction of the cutter 10. Hereinafter, by rotating the cutter IO once, eight figure-7 grooves are formed on the outer circumference of the workpiece 14 at equal intervals in the circumferential direction and sequentially shifted by ``hits'' in the axial direction. blade rows (12 in the example)
It is formed with a threaded portion of the same length as the column (column). In addition, 1
Forming a groove of the desired depth with the contact locus of the angle is the first step. 14
The cutter 10 may be rotated continuously.

FIG. 9 shows the above-mentioned cutter 1. FIG. 1O shows a right side view of the intermittent feed part machined by OK, 15 is a shaft, 16 is a groove, 17
18 is a spiral groove, and 18 is a feeding portion.

A large number of grooves 16 each having a straight bottom are formed on the outer circumference of the shaft 15 over the same length range as the row of blades of the cutter 10 . FIG. 11 is an explanatory diagram showing the advance angle of the intermittent feed part shown in FIG. In other words, the lead angle θ is zero, and there are 8 pieces consecutively spaced at equal intervals in the circumferential direction and shifted by 1 pitch in the axial direction, and as a result, these tl @ 16 form one spiral shape. A groove 17 is formed. A feeding portion 18 through which a moving member (to be described later) is fed is formed at each connection portion of the groove portion 16 cut and formed on the outer peripheral portion of the shaft 15 using a cutter IO.

The spiral cap 17 of the intermittent feed component has such a configuration.

The pointed end 8 of the moving part 6 shown in FIG. 1 mentioned above is slidably fitted. In a feeding mechanism equipped with such an intermittent feeding component, when the intermittent feeding component is busy rotating, the tip portion 8 is connected to the feeding portion 18 of each groove portion 16.
When sliding in the inner portion, the # moving member 6 moves in a predetermined direction with respect to the advance angle θ of the feeding portion 18, and the tip portion 8 moves into the groove portion 16.
When the time comes, the power to the stepping motor 1 is cut off and the motor is moved! The movement of the iIb member 6 is stopped. The moving member 6 is moved in this manner by the feeding section 18 and stopped at the groove section 16, thereby performing intermittent feeding of the moving member 6. The aforementioned 5K.

Since the advance angle θl is zero in the groove portion 16, the stopping position of the movable blade 6 is appropriate even if the rotation angle of the intermittent feeding component deviates somewhat. For this reason, the accuracy of the stepping motor is not required to be very high, and even an inexpensive stepping motor can be used.

In addition, in the above-mentioned example of fusei, each cutting edge 13 of the cutter lO is
8 cutting blades at equal intervals of 45 degrees in the circumferential direction, and sequentially shifted by VC number pinches in the axial direction. , but also cutter 10 and -m j
The rotation ratio and diameter ratio during cutting of the JO workpiece are also not limited to the above embodiments.

〔Effect of the invention〕

As explained above, according to the present invention, the machining time is faster (and the machining is easier) than when machining a spiral groove with uneven advance angles using an N' Ck machine or a special thread cutting lathe. Moreover, since the accuracy of the spiral groove is determined by the accuracy of each cutting edge of the cutter, a highly accurate spiral groove can be provided.When used in a partial intermittent feed mechanism etc. having such a spiral groove, The stopping position lf accuracy of the moving member can be improved without using a highly accurate and expensive stepping motor.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the feeding mechanism, Fig. 2 is an explanatory diagram showing the approach angle of a conventional intermittent feeding component, Figs. 3 to 11 show embodiments of the present invention, and Fig. 3 1111I side view of the cutter according to the present invention, FIG. 4 is a front view of the cutter shown in FIG. , FIG. 7 and FIG. 8 are side views showing the cutting state of a temporary workpiece by the uninvented cutter, FIG. 9 is a front view of the intermittent feed part machined by the cutter shown in FIG. 3, and FIG. This figure is a right side view of the part for intermittent feeding shown in FIG. 9, and FIG. 11 is an explanatory diagram showing the advance angle of the part for intermittent feeding shown in FIG. 9. 10...Cutter, 11...Cylinder, 1
3... Cutting blade, 14... Workpiece, 16
...Groove, 17...Spiral groove, 18.
...Feeding section. Figure 1 ρ Figure 2 Consistency Figure 3 Figure 4 6 Figure 7 13 I Figure 8 Figure 1O

Claims (1)

[Claims] In a device that forms a spiral shape on the outer periphery of the workpiece by rotating the workpiece and a cutter that cuts the workpiece in the same direction, a circumference is formed on the outer periphery of the cylindrical cutter. A cutter for cutting a spiral groove, characterized in that a number of n cutting blades are provided at equal intervals in the direction and are sequentially rubbed at a pitch of VcL in the axial direction.