JPS5924915A - Reverse tapered cutting by gear shaver - Google Patents

Abstract

PURPOSE:To prevent chips from being pressure-agglomerated at the terminal edge of a spline cutting part by making smooth the relief movement of a cutter after spline cutting by means of a relieving cam. CONSTITUTION:A following part 5 formed at one edge of a relieving arm 4 which swings around a fulcrum 3 contacts to a work table 1 on which a workpiece 2 is fixed, and a profiling part 6 formed at the other edge of the relieving arm 4 contacts to a relieving cam 10 which revolves at a constant speed around a shaft 11. A cutter 8 is set at the cutting position on the workpiece 2 during the process from A point to B point on the cam 10, and a spline having a reverse tapered part is cut onto the workpiece 2 through the transfer of the pinion cutter 8 in the axial direction in the process from B point to C point. From C point, cutting is performed relieving the relief of the pinion cutter through profiling of a construction part 14 having an R-shape on the relieving cam 10, and said relief is completed at D point, and then the cutter returns to A point. Thus, each cutting process is repeated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reverse taper cutting method for cutting a spline having a reverse taper on the inner diameter or outer side of a shaft member using a gear shaper.

Conventionally, for reverse taper cutting of internal and external splines using a gear shaper, a gear shaper as shown in FIG. 1, for example, has been used.

In FIG. 1, 1 is a work table to which a workpiece (hereinafter referred to as "work") 2 is fixed, and at one end of the work table 1 is an L-shaped relay ring supported movably at a fulcrum 3. The driven portion 5 of the arm 4 is in contact with the arm 4, and the tracing portion 6 at the other end is in contact with the relaying cam 7.

In addition, a pinion cutter 8 is arranged with a predetermined inclination angle θ to the workpiece 2 on the worktable l, and by moving the pinion cutter 8 in the axial direction, a reversely tapered spline 9 shown as a hatched part is cut in the warp 2. I'm trying to make it possible.

The cutting process is first shown in Fig. 2 (
As shown in 2), when the tracing portion 5 of the relaying arm 4 is in sliding contact with the small diameter portion 7a of the relaying cam 7, the pinion cutter Bit returns to the initial position shown in the figure, and the rotation of the relaying cam 7 moves the tracing portion 5 to the small diameter portion 7a of the relaying cam 7. 5 rides on the large diameter portion 7b as shown in Figure 2 (BI K), the relaying arm 4 swings clockwise around the fulcrum 3, and the driven part 5 moves the work table 1 toward the pinion cutter 8. Then, set the pinion cutter 8 to the cutting position of the workpiece 2.

Subsequently, as shown in FIG. 2 (C1), the pinion cutter 8 moves in the axial direction in the set state shown in FIG.

During this cutting, as shown in Figure 2 O).

When the copying part 5 falls into the small diameter part 7aK of the relaying cam 7, the relaying arm 4 swings in the opposite direction to return the work table 1 to the initial position, and as the work table 1 returns, the work 2 is scraped while the pinion It escapes from the cutter 8 and cuts the end of the spline cutting part outward. Then, as the relaying cam 7 rotates from Dl to Figure 2, the pinion cutter 8 returns to the initial position, and the above-described cutting process is repeated for the entire circumference of the workpiece 2 in the same manner.

As a result, an example of the result is a spline hunch with an inverted taper, which is indicated by diagonal lines on the outside of work 2 shown in Figure 3 (a), or the same (as shown by diagonal lines) on the inner periphery of work 2 shown in figure 3 (bl). An internal spline with a reverse taper is machined.

The process of sprue-in taper cutting using such a gear shaper is illustrated by the movement of the workpiece and pinion cutter shown in FIG. 4 with respect to the tracing positions 1 to 0 of the relaying cam 7 shown in FIG.

However, in the conventional reverse taper cutting method using a gear shaper, no relief is formed on the cutting side of the pinion cutter that shapes the workpiece.
FIG. 2 (OK) As shown, when the pinion cutter 8 escapes from the workpiece 2, chips are crimped onto the end of the spline cutting part.

Finishing work is required to remove crimped chips.

In addition, because the pinion cutter does not have escape, the life of the cutter is short.Furthermore, when the pinion cutter escapes from the workpiece and cuts up, the bulging type acts on the spindle of the pinion cutter, causing a gap between it and the operating arm that moves the pinion cutter back and forth. There was a problem in that the backlash quickly became thicker and the operating arm, on which the cutting load was applied, was more likely to be damaged.

The present invention has been made in view of such conventional problems, and it smoothes the escape movement of the cutter after spline cutting by the relaying cam, and allows the cutting of a predetermined radius shape at the end of the spline cutting part. The operating mechanism of the cutter can be extended by reducing the cutting force when the cutter escapes from the workpiece and by reducing the cutting force when the cutter escapes from the workpiece. Break! An object of the present invention is to provide a reverse taper cutting method using a gear shaper that prevents shells.

The present invention will be explained below based on the drawings.

FIG. 5 is an explanatory diagram of the gear shaper used in the reverse taper cutting method of the present invention.

First, configuration 5: To explain, 1 is a work table to which a work 2, which is a wave processing member, is fixed, and for the work table IK, a driven part is formed at one end of a relaying arm 4 that swings around a fulcrum 3. 5 is in contact, and the replicating arm 4 (l[JIc formed tracing portion 6 is 1h11
It is in contact with a relaying cam 10 that rotates at a constant speed around . A binion cutter 8 is disposed at a predetermined position opposite to a workpiece 2 fixed to a worktable 1 and is reciprocated in the axial direction by the operation of a spindle 9 by an operating arm or the like. The axial line 8' of the pinion cutter 8 is aligned with the axial direction of the workpiece 2 fixed on the work table 1, and the axis of the pinion cutter 8 is aligned with the axial direction of the workpiece 2 in order to cut a spline made of a reverse taper on the workpiece 2. The core side 8' is arranged with a predetermined inclination θ.

On the other hand, the work table 1 is connected via the relaying arm 4.
The relaying cam 10Fi for moving the pinion cutter 8 has a small diameter region 10 in a range of approximately 180°.
a and a large diameter portion 10b, and the continuous portion 14 extending from one small diameter region 10a to the large diameter portion 10b is formed as a stepped portion 12, whereas the continuous portion 14 from the other large diameter portion 10b to the small diameter region 10
The part leading to point a is a continuous part 14 having a curved surface with a radius of a predetermined size, and by tracing this continuous part 14,
While cutting into the rounded shape of the continuous portion 14 of the relaying cam 10, the work 2 is cut up and released.

FIG. 6 is an explanatory diagram showing an example of a specific cam shape of the relaying cam 10 in FIG. 5. FIG. The cam shape of the repeating cam 10 is appropriately determined depending on the axial length of the spline to be cut and the depth of the groove of the spline. 10a, a large diameter portion 10b, and a continuous portion 14 having a predetermined radius formed in a portion extending from the large diameter portion 10b to the small diameter region 10a.

That is, the relaying cam 10 shown in FIG.

A large diameter part Job with radius R1 is formed in the range of angle θ from point B to point 6, and continuous installation with a predetermined radius is formed in the range of angle θ from escape starting point C continuing from this large diameter part 10b. 14 is formed, a binion cutter is set at the biting position of the workpiece at point B, and a reverse taper spline is cut from point B to point 6.

The escape of the pinion cutter is started from point 6, and a cut-up shape along the 7-rule of the continuous portion 14 is cut at the end of the spline cutting part, and the escape of the pinion cutter is completed at point D. The range of 180″ from point 13 to point B via part A is the small diameter area 10 in the relaying cam 10 in FIG.
In the embodiment shown in Fig. 6, the binion cutter that escaped from the workpiece at point HD is not moved to the large diameter section 10b due to running over the step, and the outer circumferential diameter of section A from point D to point B is By sequentially expanding, it is possible to smoothly transition to the large diameter portion, that is, point B. Binion cutter at the reversal point/7) The amount of escape from the workpiece is set by the dimensional difference between the cam outer circumferential position and the large diameter portion 10b at point D.

Next, the relaying cam 10 shown in FIG. 6 is used in the gear shaver shown in FIG. The reverse taper cutting method of the present invention will be explained with reference to FIG. 7, which shows the relative positions of the workpiece 2.

First, as shown in the 7th national report, when the tracing portion 6 of the relaying arm 4 is in sliding contact with the approximate center shaft of the small diameter region of the relaying cam 10, the pinion cutter 8 moves to the initial position with respect to the workpiece 2. condition, relaying cam 10
As the relaying arm 4 swings clockwise due to clockwise 1+j1 rotation of
The tracing part 6 of the relaying arm 4 is the sixth
When the work table 1 comes into sliding contact with point B of the relaying cam 10 shown in the figure, the movement of the work table 1 is stopped, and at this time the work 2 is set at the biting position with respect to the pinion cutter 8. Next, the copying part 6 of the relaying arm 4 is connected to the relaying cam 1.
0 large diameter part] In the process of rotating the relaying cam 10 while in sliding contact with the ObK, the pinion cutter 8 is moved in the axial direction as shown in FIGS. The spline cutting portion 15 having a shape is cut.

Next, when the tracing portion 6 of the relaying arm 4 reaches the 0 point, which is the escape start point of the pinion cutter 8, it comes into sliding contact with the rounded connecting portion 14 of the relaying cam 10, and this connecting portion The work table 1 moves in the direction away from the pinion cutter 8 due to the tracing of the part 14, and at the same time the pinion cutter 8 moves in the axial direction. As shown in Figure 8 (CD) K, the tracing section 6 of the relaying arm
When point D of the relaying cam is located at
Through the process of 0, a rounded shape similar to the rounded shape of the continuous portion 14 at 1° of the relaying cam is cut at the end of the spline cut portion of the workpiece 2.

Subsequently, the pinion cutter 8 that escaped from the V workpiece 2 as shown in D+ returns to the initial state of failure through the rotation of the small diameter area of the relaying cam] 0, and then returns to the initial state of failure in the seventh cutter (4). Work 2 of the process leading to Figure 8 ~ (1) l
A spline having a reverse taper is repeatedly cut on the outer circumference of the workpiece 2 over the entire circumference.

FIG. 8 is an explanatory diagram showing the H pair of the workpiece and the pinion cutter in the reverse taper cutting method of the present invention shown in FIG. Correspondingly, in the process from point A to point B of the 1-pin cam 10, the binion cutter 8 is moved to the workpiece 2.
Set it at the cutting position of , cut a spline with a reverse taper on the workpiece 2 by moving the pinion cutter 8 in the axial direction from point B to point 0, and cut the spline with a reverse taper from point 0 to the rounded shape of the relaying cam 10. The continuous portion 14 having the shape of the cutter is cut while escaping, and the escaping is completed at point D, and the cutting process is repeated again by returning to point A.

FIG. 9 shows a workpiece machined by the above-mentioned reverse taper cutting method of the present invention.

FIG. 9(a) shows a spline 15 having a diagonal waist portion and a reverse taper cut on the outer periphery of a workpiece 2.

A cut-up 16 having a predetermined rounded shape is formed at the end of the spline cut portion. Fig. 6 (The figure is a spline 15 that is cut on the inside of the workpiece 2 and has an inverted taper shown by diagonal lines. At the end of the spline cutting part, there is also a cutter that has a predetermined shape. A raised portion 16 is formed.

According to the reverse taper cutting method of the present invention, the workpiece escapes from the pinion cutter smoothly by tracing the continuous portion 14 having a predetermined 7-hole formed on the relaying cam, and as a result, the pinion cutter Cutting is now performed by holding up a predetermined rounded shape while escaping the workpiece, and chips are not crimped onto the end of the spline, eliminating the need to remove chips after spline machining.
In addition, since the amount of cutting due to the escape of the pinion cutter gradually decreases, the cutting force applied to the pinion cutter decreases smoothly, and since no sudden changes in cutting force are applied to the spindle of the pinion cutter, the operating rod that reciprocates the pinion cutter is used. without causing damage such as
Since the pinion cutter can escape from the workpiece while cutting, the tooth tips of the pinion cutter are not damaged and the life of the cutter can be significantly extended.

Incidentally, in the above-mentioned embodiments, a spline having a reverse taper is cut by tilting the axis of the pinion cutter by a predetermined angle with respect to the axial direction of the work placed on the work table.

When machining a spline parallel to the outside or inside of the workpiece by setting the axial direction of the workpiece and the pinion cutter in the same direction, the end of the spline cutting section can be rounded up to a smooth finish. This eliminates the pressure of chips against the cutter, and also reduces the life of the cutter and prevents damage to the operator's insert that operates the cutter.

As described above, according to the present invention, the work table is moved by the swinging of the relaying arm due to contact with the large diameter portion of the relaying cam, and the workpiece is set at the cutting position of the pinion cutter.

In this set state, move the pinion cutter in a direction with a predetermined inclination with respect to the axial direction of the workpiece to cut the spline with a reverse taper. When the 2-pinion cutter moves the predetermined angle, From the part to the small diameter area
Return the work table by swinging the relaying arm in the opposite direction by following the connecting part with a curvature of . Since it is possible to create a cut-up with a predetermined radius shape at the end of the cutting part, cutting at the end of the spline cutting part can be achieved by cutting up with a predetermined round-shape when the binion cutter escapes from the workpiece. It eliminates powder adhesion and eliminates the need for finishing work to remove chips after cutting St + machining, and the binion cutter fti escapes while cutting the workpiece, gradually reducing the cutting work done by the binion cutter and joining the binion cutter. This has the effect of preventing sudden changes in cutting force, thereby extending the life of the cutter, and also smoothing the load change on the operating rod that reciprocates the pinion cutter in one direction, thereby preventing it from breaking. is obtained.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of a conventional gear shaper cutting a reverse taper spline, Figure 2 is an explanatory diagram of the cutting process shown in Figure 1, Figure 3 is an explanatory diagram of a workpiece machined with a reverse taper spline, and Figure 4 is an explanatory diagram of a workpiece machined with a reverse taper spline. The figure is an explanatory diagram showing the relative positions of the workpiece and the binion cutter in Fig. 1, and Fig. 5 is an explanatory diagram of a gear shaper that realizes the reverse taper cutting method of the present invention, and a broom 6.
The figure shows the specific shape and shape of the relaying cam used in the present invention.
3-fc explanatory diagram, Figure 7 is a process explanatory diagram showing the cutting process of the present invention with respect to the relaying cam position and the relative position of the workpiece and the binion cutter, @ Figure 8 shows the relative position of the workpiece and the binion cutter in the present invention. Figure υ is an explanatory diagram showing an example of a workpiece processed according to the present invention. 1... Work table 2... Workpiece (workpiece) 3... Fulcrum 4... Relaying arm 5... Follower part, 6... Copying part 8
...Binion cutter 8'...Axis core line 9...Spindle A.]0...Relaying cam]Oa...Small diameter area 10b...Large diameter portion 12...Step part
14... Continuous part 15... Spline cutting part 16
...Last-up agent Susumu Takeuchi Figure 3 (G) (b) Figure 4 Figure 6 Figure 7

Claims (1)

[Claims] The work table is moved by the swinging of the raping arm due to contact with the large diameter portion of the relaying cam, and the workpiece is set at the cutting position of the pinion cutter. In this set state, the pinion cutter is moved in a direction having a predetermined inclination with respect to the axial direction of the workpiece to cut the spline in a reverse taper.゛ (When the pinion cutter moves in a predetermined line,
The work table is returned by swinging the relaying arm in the opposite direction by tracing the connecting portion from the large diameter part of the relaying cam to the small diameter part with a predetermined curvature, and the pinion cutter is splined by returning the work table. 1. A reverse taper cutting method using a gear shaper, characterized in that a raised cut with a predetermined rounded shape is formed at the end of a spline cut portion gently away from the cut portion.