SU60070A1 - Wheel straightener for grinding worm spline cutters - Google Patents

Description

The invention relates to a wheel straightening tool for grinding a worm spline cutter, the use of which is intended to obtain a regular curve of a worm spline cutter profile.

In contrast to the known, in the proposed device for communicating the movement to the diamond bearing engine, levers passing perpendicularly axially perpendicular to each other are used, one of which is fixed on a replaceable gear wheel or a replaceable running wheel, run around without a slip on the gear rack. or the plane, and the second sits rotatable on a slider, movable in a parallel toothed rack groove.

In this case, the axis of rotation of the second lever is movable in the plane of the gear rack passing through the initial straight line, or in the plane of the hopper gear or disk, but is rigidly connected with the axis of its rotation.

In FIG. 1 and 2 are two embodiments of the proposed device.

FIG. 3-7 are diagrams explaining the operation of the device.

In the guiding groove 1 (Figs. 1 and 2), a slider moves, carrying on itself two levers 2 and 3 perpendicular to each other. The connection between these levers is carried out using the slider 4, which can slide along lever 3, and on the lever 2.

The lever 2 is rigidly connected with a replaceable grinding wheel 5 (Fig. I) or a removable gear wheel 5 (Fig. 2). The disk 5 rolls without sliding along a plane passing through the center of rotation of the lever 3. A diamond 9 is installed parallel to the lever 3.

Movement is transmitted from the handle with the lever 6 to the caliper 7 and through the belts 8 to the removable disk 5.

FIG. 2, the movement is transmitted from the handle by a lever with a spongy sector to the interchangeable gear 5.

The profile of auger milling cutters, as is known, is the envelope of a family of direct, rigidly connected

the initial circle in the case of a gauge without sliding this circle along the initial straight line {fig. 3). When an envelope is formed, the following well-known phenomena occur:

1. The production right is all time tangent to the envelope B of the instantaneous point M.

2. The normal to the generating line at its point of contact with the envelope (point M} all the time passes through the instantaneous center of rotation (point O).

3. The instantaneous center of rotation is placed at the point of tangency of the initial circle with the initial straight line (point O).

Thus, the envelope is defined as the locus of the points of intersection of the generating line with the normal to it passing through the instantaneous center of rotation.

In the proposed device, the tip of a diamond or indicator 9 has a theoretically exact envelope curve.

The role of individual elements in the instrument is as follows.

The disk 5 is an initial circle. The disk or gear 5 can only roll without sliding on a plane or in the case of a gear wheel on the rail (Fig. 4).

The lever 2 is rigidly connected to the disk 5. It is a direct producing rigidly connected with the initial circle (Fig. 5).

Consequently, when the disk 5 is rolling, the lever 2 also has a rotational “forward movement.

The lever 3 has a rotational movement around the axis Oj or O, (Fig. 6), which is rigidly connected to the axis of the disk 5. It is a normal to the generating straight line passing through the mg-dependent center of rotation.

The lever 3 is always perpendicular to the lever 2, because these two levers pass through the slots of the slider 4, which are perpendicular to each other.

The axis of rotation of the lever 3 (point Oj or O.) performs the designation of the instantaneous center of rotation.

Thus, when the disk 5 is rolling, the axis of rotation of the lever 3 moves with the disk axis (from position 1 - O, in position 2 - O ;,), and the lever 3 itself, apart from this portable movement, also has a rotational movement caused by rotation of the lever 2.

The levers 2 and 3 when rolling the disc 5, as it were, slid over each other (Fig. 6).

The slider 4 has the ability to slide along the lever 2 and along the lever 3. The op has two slots, perpendicularly located one relative to the other, through which the levers 2 and 3 pass. Thus, the levers 2 and 3 remain the same time. to each other. Engine 4, on the other hand, plays the role of an instantaneous point M or M. (Fig. 6), the entire time of the ng envelope curve. He lies all the time at the crossroads of levers 2 and 3.

By installing a diamond 9 at certain points in the engine, you can get a theoretically exact envelope path for the point of a diamond or indicator.

Imagine the following position I no fig. 7. Disk 5 has a radius equal to RO.

The lever 2i passes through the instantaneous center of rotation O and forms an angle 7 with the axis. Therefore, the lever 3, which passes all the time through the instantaneous center of rotation Oj, will cross the lever 2i perpendicularly: to it at the point of the instantaneous center of rotation O, i.e. lever 3, forms an angle - (with the axis X (in this case we assume the position of the direction of the corners clockwise).

Engine 4 is located at the intersection of the levers 2j and 3 ,. The tip of the diamond 9 is in the instantaneous center of rotation O and simultaneously lies on the envelope at the point M (the points Oj and M are the same). If you roll the disk 5 to position 5 ,,,

so that the lever 2 forms an angle Φ with the axis y, then the following ratios of the individual elements will be obtained (position II).

Lever 2, will become at an angle cp to the y axis and shift from its initial position 2 to position 2 ". The axis of rotation Oa of the lever 3, as well as the axis of the disk 5, will pass a path equal to RoCf-t) Lever 3 "passes through its axis of rotation O, perpendicular to the lever 2., Therefore it will pass the path equal to R ,, (cp -Y) and rotates at an angle cp to the x-axis.

Engine 4, will slide along lever 2, and along lever 3, and turn out to be at the intersection of these two levers. As a result, the tip of the diamond will describe the envelope between the points Mj and M ,, shown in FIG. 7

Subject and s About the bout i,

A wheel straightening device for grinding worm spline mills, which is different in that the levers 2 and 3 that pass through it are axially movable axially moving to communicate the movement of the diamond diamond to the slider 4. or a replaceable rolling disk 5 running around without a slide on a rack or plane, and the second one is pivotally mounted on a slider movable in a parallel gear rack or plane of groove i, and its axis of rotation is movable in a plane, move therethrough initial straight toothed rack or a running plane of the disc 5 and rigidly connected to the axis of rotation of the toothed wheel or disc.

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