JPH01246004A - Cutting tool unit for edge cutting-off - Google Patents

Abstract

PURPOSE:To make it possible to cut a deep groove on a work end face with its refuse being discharged smoothly by constructing a whole cutting tool as a designated curve in a cross direction to give peculiar vertical scooping angle and core elevation at a cutting edge tip, which are maintained by a holder. CONSTITUTION:A holder 1 is provided with a supporting face 10 constructed as a curved face, with the outer periphery of which a cutting tool 2 makes contact, and comprises a block 11 to be fitted to the core elevation of a lathe, a stopper portion 12 to be hit at the lower side of the cutting tool 2 and a clamping block 6. The cutting tool 2 being curved in a shaft direction, the outer periphery is R in radius to a center C of the lathe and the inner periphery is r in a radius from a center C1 which determines a plate thickness Z at the center portion. Both radii of R and r are same. The cutting tool 2 has a taper portion 21 extending from a angle of relief formed in about one third of the width at the end in longitudinal direction of the cutting tool 2 and a cutting edge tip 5 fixed at a taper end 23. The cutting edge tip 5 is formed as an approximately trapezoidal section, a point C2 at which a extention line n from the end 50 forming a vertical scooping angle theta intersects the side-to-side center line of the lathe is defined to be at a constant distance (a) from the center C of the lathe, and a core elevation (b) is located above a vertical center line m of the lathe.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an end face parting tool unit for a lathe, and in particular, it is capable of easily forming deep grooves, holes, or bosses in steel materials, and is capable of easily forming shafts, rolls, etc. This invention relates to an end face cutting tool unit that enables deep grooving into the end face of a stepped part of a spindle or the like.

In general, when using a lathe to form deep grooves, holes, or bosses in steel materials, there are major restrictions depending on the configuration of the tool. For example, an end face parting tool can cut to a depth of about 38 volumes at most. It's nothing more than that. As shown in FIG. 8, this end face cutting tool has a cutting tool 2 that is removably fixed to a holder 1 that is attached and fixed to a lathe with a plurality of tightening screws 3. The cutting tool 2 is a generally flat member having a predetermined width and length, and only the cutting side end 4 has a curved surface, and a cutting edge tip 5 is attached to the tip of the cutting end 2a. . Conventionally, the maximum length of this cutting side end portion 4 is about 38ffII+. Then, this cutting tool 2 comes into contact with the rotating steel material and bites into it while cutting with the cutting edge tip 5, thereby cutting a groove having the width W of the cutting edge tip 5 into the steel material. Therefore, the groove formed in the ll material can only be cut by the length L of the cutting side end 4 having the curved surface of the cutting tool 2. Even if the length of this L is made longer, the cutting tool 2 will chatter,
Moreover, the cutting waste is not smoothly discharged to the outside and becomes clogged, making it impossible to cut. Therefore, it has been impossible to make deep grooves and holes using conventional end face parting tools. Also, when drilling holes, the circumferential speed is 22 m.
/win, feed 0. 1~0, 15 m/rev
The machining speed is extremely slow, the cutting resistance is large, which increases worker fatigue, and it is impossible to drill holes with large diameters (100φ or more). Furthermore, if the hole is enlarged by rebiting, the depth of cut is about 5 f111, and the same process has to be repeated over and over again, which increases the machining time and is inefficient. It is also difficult to use the material effectively because it is wasted as cutting waste.

Problems to be Solved by the Invention Therefore, in view of the above-mentioned conventional circumstances, the present invention has developed the overall shape of the cutting pie and the position and shape of the cutting edge tip, thereby making it possible to cut even long steel materials, which was previously impossible. Drilling was done to enable machining, deep grooving, boss formation, etc., by cutting with an end face cutting tool.

In order to achieve the above object, the present invention provides a cutting tool whose entire shape is curved in the width direction, and a tapered end portion formed on one side of the cutting tool that faces the cutting force. An end face parting tool unit is constituted by a cutting tool tip fixed to the section, and a holder having a curved surface that presses and holds the cutting tool in a slide-adjustable manner. It has an inner circumferential surface and an outer circumferential surface on a circular arc formed from two points with the same radius, and is entirely curved in the width direction, and has a tapered end portion formed on one side in the longitudinal direction, and the tapered end portion While the extension line of the tip of the cutting edge that forms the vertical rake angle of the cutting edge tip fixed to is located below the center of the lathe,
The center height of the tip of the cutting edge is set to be located above the vertical center line of the lathe, and the holder has a support surface curved on an arc formed at a constant radius from the center of the lathe. To provide an end face parting tool unit capable of holding a cutting tool in pressure contact with a surface in a slide-adjustable manner.

According to the present invention having the above configuration, the entire width of the cutting tool is curved with a predetermined radius according to the steel material to be cut, and the holder also has the same radius as the outer peripheral surface of the cutting tool. Since it has a curved support surface, the cutting tool can be held in pressure contact with the support surface so that it can be slid and adjusted. Moreover, the cutting tip of the cutting tool has a unique vertical rake angle and a center height at the tip of the cutting tool. Since the extension line of the tip is located below the center of the lathe, the chips are smoothly guided and discharged to the outside of the groove with a slight twist to the right, and the chatter of the cutting tool is also eliminated, making it easier to clean deep grooves. formation.

Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a perspective view showing an embodiment of an end face cutting tool unit according to the present invention, and corresponds to FIG. 8 described above. FIG. 2 is a side view, and FIG. 3 is a front view. In the figure, 1 is a holder, 2 is a cutting tool, 3 is a tightening screw,
5 is a cutting edge tip.

The holder 1 is a member of a predetermined width and length that has a support surface 10 made of a curved surface of a predetermined radius that presses against the outer peripheral surface of the cutting tool 2, and is mounted as a block for fixing in accordance with the center height of the lathe. 11, and a stopper part 1°2 with a hook-shaped cross section that the lower end surface in the width direction of the cutting tool 2 should come into contact with.
The tightening screw 3 is placed opposite the stopper part 12.
The clamp has a block 6 which can be attached and detached by. The support surface 10 is a curved surface that is the same as the curved part of the outer peripheral surface of the cutting tool 2, and supports the center height of the cutting tool 2 at a ratio of 4.3 on the road and 5.7 on the bottom with respect to the vertical centerline m of the lathe. do.

The cutting tool 2 is a plate having a predetermined length and width, and is curved in the width direction as a whole, and as shown in FIG. On the other hand, the inner circumferential surface is at a certain distance (radius r) from the center C1 that determines the thickness Z of the central part, and the amphibodi diameter R,
r are the same (R=r). Therefore, both end portions in the width direction of the cutting tool 2 are formed thinner than the center portion. Further, at the longitudinal end of the cutting tool 2, an extended taper part 21 with a -th clearance angle is formed to approximately one-third of the width, and a tapered end is formed from the taper part via a curved edge 22. A portion 23 is formed. This tapered end 23 has a tapered portion 21.
A cutting edge tip 5 is fixed at the intersection of the edge 22 and the edge 22. This cutting edge tip 5 is, for example.

The first front clearance angle is approximately 8 degrees, and the parallel rake angle is approximately 20 degrees.

The first side clearance angle is approximately 15 degrees, the back taper is approximately 15 degrees,
The back rake has a substantially trapezoidal cross section having an angle of about 30 degrees,
Moreover, it has a predetermined dimension with respect to the width of the cutting tool 2. The point C2 where the extension line n of the cutting edge tip 50 forming the vertical rake angle 0 of the cutting edge tip 5 intersects the left-right center line of the lathe is a certain distance a(1,
5 to 3.001 strokes), and at the same time, the tip of the cutting edge 5
The center height of 0 is above the vertical center line m of the lathe (5 to 15
I).

The cutting tool 2 and holder 1 are 7-inches of various sizes.
As shown in FIG. 4, the cutting tool 2 has curvatures R1, R2, R3, R4, etc. that increase in a certain order (for example, every 30 m).
It is better to prepare items a to 2d in advance.

The wall thickness of the cutting tool 2 is determined by the difference Z between the center C of the lathe and the center C1 of the inner peripheral surface of the cutting tool 2, and the appropriate value is 6 to 7-. Further, as shown in FIG. 2, it is preferable to provide a numerical display 24 that determines the length of the cutting tool 2 protruding from the holder l.

Next, the operation of the above embodiment will be explained.

As shown in FIGS. 5 and 6, a steel material 32 is chucked on a rotary chuck 31 of a lathe 30.

An end face parting tool 2 equipped with a radius necessary for deep grooves and holes to be formed in a steel material 32 is moved through a holder 1 to a tool moving table 3.
Attach it to 4. When the cutting tool moving base 34 is moved along the bed 36 while rotating the lathe clockwise, the cutting edge tip 5 cuts the end face of the steel material 32. Since the cutting tool 2 is curved with a predetermined radius, it can follow the cut groove 35 without any hindrance, and no chattering occurs. Therefore, if the cutting tool 2 is moved as far as possible toward the steel material 32, the groove 35 will be deeper.
can be cut, and it is also possible to finally reach the opposite end surface of the steel material 32. Note that during this cutting, the cutting edge tip 5 having the shape shown in FIG. Since it rotates in the opposite direction, the weight of the cutting chips also applies a downward pulling force, so the cutting chips are smoothly discharged without causing any clogging.

Therefore, when grooving was actually attempted using the example, it was found that grooving to a depth of 1701 mm with a diameter of approximately 200 mm was easily possible. In this way, it is possible to cut the deep groove 35, so as shown in FIG. 7, the circumferential groove A is first cut from the end surface of the steel material 40, and then the groove is cut diametrically from the outer circumferential surface with a parting tool or the like. B is formed and connected to the circumferential groove A, and the boss 4
1 and further form a circumferential groove C. After that, change the chunking (change the direction) to form a circumferential groove, and use a cutting tool to form a cutting groove E in the diametrical direction to cut out the boss 42. Finally, a circumferential groove F is formed to form the boss 42. 43 and the remaining portion 44 can be used as a stepped shaft. In this way, multiple different products can be machined at the same time.

According to the present invention described above, the entire cutting tool is formed of a plate of a predetermined length and width formed with a predetermined radius in the width direction, and a unique vertical rake angle and center of the tip of the cutting edge are formed. Due to the function of the high cutting edge tip and holder, the cutting tool does not cause chatter and cutting waste is smoothly discharged, making it possible to cut deep grooves and shorten machining time. Employee fatigue is greatly reduced. In addition, the formation of deep grooves makes it extremely easy to form bosses, making effective use of materials, and can be used in fields that conventionally relied on forging and casting. It has the first-rate effect of making it possible to insert it.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of an end parting tool unit according to the present invention, Fig. 2 is a side view thereof, Fig. 3 is a front view thereof, and Fig. 4 is an example of an end parting tool with a different radius. A front view and a partial side view showing the. Fig. 5 is a plan view showing an example of work applied to a lathe, Fig. 6 is a front view of Fig. 5, Fig. 7 is an explanatory view of an example of processing, and Fig. 8 is a perspective view showing a conventional end face parting tool. be. C... Center of the outer peripheral surface (center of lathe and steel material) CI...
・Center of the inner circumferential surface (determines the maximum wall thickness 2 of the cutting tool) C2... Intersection of the left-right center of the lathe and the extension of the tip of the cutting edge that forms a vertical rake angle m... The vertical center line of the lathe

Claims (3)

[Claims] (1) A cutting tool whose entire body is curved in the width direction, a cutting tip with a tapered end formed on one longitudinal side of the cutting tool and fixed to the tapered end, and the cutting tool can be slid and adjusted. An end face cutting tool unit characterized by comprising: a holder with a curved surface that is held in pressure contact with the holder; (2) Maximum wall thickness dimension It has an inner circumferential surface and an outer circumferential surface on an arc formed with the same radius from two separated points, and is curved in the width direction as a whole, with a tapered end on one side in the longitudinal direction. is formed, and the extension line of the tip of the cutting edge that forms the vertical rake angle of the tip fixed to the tapered end is located below the center of the lathe, while the center height of the tip of the cutting edge is below the vertical center line of the lathe. An end face parting tool characterized by being located above. (3) An end face parting tool having a support surface curved on an arc formed at a constant radius from the center of the lathe, and a cutting tool is held in pressure contact with the support surface so that the cutting tool can be slid and adjusted. holder.