DE940027C - Device for guiding a cutting tool of cutting machines to generate the penetration curves on cylindrical workpieces to be joined - Google Patents

Description

(WiGBl. P. 175)

ISSUED MARCH 8, 1956

M 22843 Ib / 4gh

Addition to patent 93? 387

In the German patent no. 937 387 a device for guiding a cutting tool of cutting machines for generating the penetration curves on cylindrical workpieces intersecting at an angle γ, e.g. B. pipes, provided with the radii R and r , in which the cutting tool is given a movement in the direction of its axis depending on the rotational movement of the workpiece to be machined.

The additional invention relates to the improvement and further development of the subject matter of the main patent. According to the additional invention, a device of the type mentioned is provided which one of the drive of the pipe to be cut rotatable first lever and one rotatable on the contains the second lever attached to the first lever, the free end point of which is the position of the cutting tool determined when the two levers on a pipe

axis parallel guide in the two pipe diameters proportionally equal distances from their common point of articulation slide, and one of the levers on a guide perpendicular to the pipe axis is slidably and rotatably attached.

According to a preferred embodiment, the

first lever a length of

Lever a length of - _:

ίο smy

and the second siny

, and the distance of the

Articulation point of the first lever on the guide perpendicular to the pipe axis from the common articulation point the lever is the same

According to a further preferred embodiment, when machining a pipe (radius r) which is to run into a flat wall (radius R = 00), only one lever is used which has its end points on the two mutually perpendicular

Guides slides and the length -

owns.

According to a further preferred embodiment, when machining a pipe (radius r) which is to run into another pipe (radius R) at an angle γ = 90 °, the first lever has a length of r and the second lever has a length of R , and the common point of articulation of the two levers is rotatably and slidably arranged on the guide perpendicular to the pipe axis.

Embodiments of the invention are explained in more detail with reference to the drawings.

Fig. Ι shows the device according to the invention in various positions during movement; Fig. 2 shows a device for guiding the Cutting tool for processing an incoming pipe, the special case being shown that the pipe to be processed runs into a ebepe wall;

Fig. 3 shows an apparatus in different positions during the movement, wherein the special case is shown here that the incoming pipe enters into the main pipe at an angle of 90 ^0th

The device shown in Fig. 1 consists of two levers 12 and 13 which are rotatably connected to one another at point 22 and their ends 11 and 33 are slidably arranged on a guide 9 parallel to the axis of the pipe to be machined. in the Point 44, the lever 12 is slidably attached to a guide edge 10 perpendicular to the guide edge 9.

The sliding points 11 and 33 have one another

Pivot 22 distances, the ratio of which is r: R.

When processing the incoming pipe

and the

(Fig. 1) the lever 12 has the length lever 13 the length

sin γ

siny

The lever 12 is rotated through 360 ° during the machining process. With this rotary movement, a rotary movement of the pipe to be machined is coupled about its axis. That. incoming pipe, which has to be trimmed over its entire circumference, is also ^{rotated 360 °} at the same angular speed as lever 12. The distance between points 22 and 44 is

when machining the incoming pipe = -.

The sliding guides in points 11 and 44 are arranged on the lever 12 in such a way that in each case the leadership of a sliding point the movement of the other floating point does not interfere. Therefore, the lever 12 preferably consists of two superposed interconnected levers, one of which the sliding point 11 and the other the sliding point 44 owns.

In Fig. Ι the device for the Machining of the incoming pipe shown in five successive positions of the lever system. .

The intersection angle γ of the two pipe center lines is 60 °.

As can be seen from Fig. 1, the cutting tool attached at point 33 reaches on his Paths the points 1, 2, 3, 4 and 5. These points correspond to the incoming one seen from the side Tube points 1 'to 5' and points 1 "on the tube seen in the direction of the axis to 5 ". The curve described by points 1 'to 5' represents half the cutting path. The remainder The cutting path is symmetrical for this and is determined by the movement of the lever system with further rotation of the lever 12 is generated.

To clarify the mode of operation, one can first imagine that the radius of the main pipe is infinitely large. In this case, the intersection curve 1'-2 "- 3" - 4 "- 5 'would appear as a straight line 1 / -5' in FIG. 1. The part of the incoming pipe that results when the radius of the main pipe is infinite (the incoming pipe is inserted into a flat wall) is called the "angle part". The angle part is determined by the intersection angle γ of the center lines of the two pipes and the radius of the incoming pipe; it is represented here by the triangle i'-5'-5 '. ".

If the main pipe now has a certain finite radius, as can be seen from FIG. 1 is, of the incoming pipe must stop more than the angle part described above is equivalent to. This part, which remains at a finite radius of the main pipe beyond the angle part, should be referred to as an "adapting part".

In Fig. 2 is for a more detailed explanation of the mode of operation the 'device, the production of those intersection curves that arise when cutting a incoming pipe results at an angle of 60 ° is to be connected to a main pipe with an infinitely large radius. That means so that only the angle part is made here.

Fig. 2 shows the finished cut incoming pipe from the side. You can see here that the intersection curve i'-2'-3'-4'-5'-6'-7'-8 'appears as a straight line. "

Below that, the fully cut incoming pipe is shown in a top view. The intersection curve appears in this view as an ellipse.

In Fig. 2/4, the lever 44-22 can be seen with the cutting tool arranged in 22, which in its

Back and forth a way of

after -

- continue over 0 to + ■

over 0

tgy

return

tgy 'tgy

must in order to generate the required intersection curve, which in this case lies in a plane. The proof for the correctly selected length of the lever can be found in Fig. 2/1. You can see here that the distance 3'-o "',

is.

which corresponds to the length of the lever

tgy

Finally, Fig. 2/4 shows how this back and forth movement of the cutting tool at point 22 is brought about. The lever 22-44 slides with its point 22 on a guide edge parallel to the axis of the pipe to be processed and with its point 44 on a guide edge perpendicular to the axis of the pipe to be processed. It is rotated ^{360 0.}

The incoming pipe to be processed and the lever 44-22 rotate at the same angular speed.

Fig. 3 shows another simple case. Here, since the angle of the two pipe center lines 90 ^0, the angular part need not be taken into account. Only the matching part occurs.

The lever system here consists of levers 11-22 and 22-33. * £ ^he is movable on a plane perpendicular to the axis of the incoming pipe shown here slideway 10, item 22, in which the two levers are movably connected. Further, the lever 11-22 is rotated at an angular speed which is equal to the angular speed of the incoming pipe. Lever 11-22 r has the length, levers 22-33 ^nat the length R (sin 90 ⁰ = 1).

Fig. 3/5 together with Fig. 3/9 should serve as an explanation of the selected lever lengths. In order to generate the desired cutting curve, the cutting tool must cover a path on the leading edge 9 which amounts to R -] / '~ (s? - r>) in the direction of the axis of the incoming pipe. This is achieved by the lever arrangement shown. The cutting process begins in the position according to Fig. 3/1. 3/2 to 3/7 the position of the mentioned levers is shown, which they assume after each 45 ° rotation of the incoming pipe and accordingly after each 45 ° rotation of the lever 11-22. The cutting tool, which is attached at point 33, successively reaches points 1 to 7 and cuts the required cutting curve (generation up to point 7), as shown in Fig. 3/8 in a side view and in Fig. 3/9 is shown seen from above.

If one now turns back to the general case of FIG. 1, one recognizes that they are a combination of the simple cases dealt with in FIGS. 2 and 3.

Since the radius of the larger pipe has a finite value, the adapter must be taken into account. In addition, the ^{cutting angle different from 90 0 has the} effect that the angle part has to be taken into account (and this also has a repercussion on the adapter part).

The lever piece 22-44 ^nat the length

and loading

the consideration of the angle part is effective.

Levers 12 (11-22) and 13 (22-33) have the

Lengths - and -. For explanation is in Fig. 1 in

⁰ smy any ° °

In the direction of the axis of the incoming pipe, that part of the path of the cutting tool which corresponds to the angle part is denoted by x, and the part corresponding to the adapter part is denoted by y , α is the perpendicular from point 3 'to the distance i'-5'.

In the event that the cutting angle γ of the center lines of the two pipes 90 equal to ^0, the required maximum feed of the cutting tool would be a. However, since γ is not equal to 90 ⁰ here, the cutting tool has to cover the distance χ to take account of the angle part and then the distance y, which is in a certain ratio to a .

a a

sm γ = - : y

siny

In order to get from the distance a, which results at γ = 90 ⁰ from the movement of the levers with the lengths r and R , to the distance y , if γ is not

: 90 ⁰ is, the levers in the ratio -, so

siny

ver

siny

long. So the lever lengths are with the number

to multiply.

For the processing of the incoming pipe therefore applies in the general case of FIG. 1 that the levers

r r r

7> ²² ~ 33 = -ZTZTT ■ ²² -44 = -r-—

11-22 =

siny

must be.

smy

Claims (4)

PATENT CLAIMS: 1. Device for guiding the cutting tool of cutting machines for generating the penetration curves on cylindrical workpieces that intersect at an angle γ, e.g. B. pipes, with the radii R and r, the cutting tool being given a movement in the direction of its axis depending on the rotational movement of the workpiece to be machined, according to patent 937 387, characterized by a first lever rotatable by the drive of the pipe to be cut and a second lever rotatably attached to the first lever, the free end point of which determines the position of the cutting tool when the two levers slide on a guide parallel to the pipe axis in the two pipe diameters at relative distances from their common pivot point and one of the levers slides on a guide perpendicular to the pipe axis - and is rotatably attached. 2. Device according to claim 1, characterized in that that the first lever has a length of and the second lever has a length of siny "siny and the distance of the articulation point of the first Lever on the guide perpendicular to the pipe axis from the common pivot point of the levers is equal to.
" tg γ 3. Apparatus according to claim 2, characterized in that when machining a tube (radius r) which is to run into a flat wall (radius R = oo) only one lever is used, which with its end points on the two mutually perpendicular guides slides ■ y and the length owns. 4. Apparatus according to claim 3, characterized in that when machining a pipe (radius r) which is to enter another pipe (radius R) at an angle γ = 90 °, the first lever has a length of r and the second Lever 'has a length of R and the common point of articulation of the two levers is rotatably and slidably arranged on the guide perpendicular to the pipe axis. For this purpose ι sheet of drawings