RU1808514C - Device for cutting closed curvilinear grooves on spherical surface of workpieces - Google Patents

Abstract

Usage: machine tool, in particular the processing of closed curved grooves on a spherical surface. SUMMARY OF THE INVENTION: from an electric motor 1 through a gearbox 2, on an output shaft of which a bevel gear 3 and a crank A are mounted, translational movement along an arc of a circle through a connecting rod 5 and rocker 6 is transmitted to the tool head 10. Crank 4, connecting rod 5 and rocker 6 are articulated are interconnected, and the latter with the housing 7. Simultaneously, the rotation of the bevel gear 9 engaged with the gear 3 is transmitted, in the hole of the hub of which a device is mounted for fastening the workpiece 8. 2 ill.

Description

The invention relates to machine tools and can be used in mechanical engineering for cutting closed grooves on a spherical surface.

The purpose of the invention is to expand the technological capabilities and increase the accuracy of processing,

In order to achieve the goal in a device for cutting curved grooves on spherical surfaces, including a tool head, a housing and a builder mechanism, made in the form of kinematically connected to each other pivotally connected to the housing of the crank and rocker arm, all axes of the hinges and the tool head mounted into the beam, intersect at one point in the center of the sphere to be processed, the workpiece is kinematically connected to the beam with the possibility of cycloidal motion regarding cutting tool

In order to simultaneously cut several closed grooves across the spherical surface in the beam in the appropriate places, depending on the orientation of the grooves on the sphere, tool heads are mounted in an amount equal to the number of grooves required.

To change the shape of the groove with interchangeable gears, the relative speed of rotation of the part and rocker is changed.

Figure 1 shows a diagram of the proposed device; in Fig.2 - step and amplitude of the chopped groove.

A device for cutting grooves on spherical surfaces consists of an electric motor 1, a gearbox 2, on the output shaft of which a bevel gear 3 and a crank 4 are fixed. A connecting rod 5 is connected by rotary kinematic pairs with a crank 4 4 and a rocker arm b, which is hinged on the other hand associated with the housing 7. The attachment with the workpiece 8 is fixed in the bevel gear housing 9, which is installed in the housing 7 of the device and engaged with the wheel 3. In the rocker arm b in the appropriate places / including the place of the ball A low-level connection with a connecting rod 5 / includes tool heads 10, the number of which is equal to the number of grooves required simultaneously. All axes of kinematic pairs and tool heads pass through the center of the machined sphere,

The device operates as follows. From the electric motor 1 through the gearbox 2, the rotation is transmitted by the interchangeable bevel wheel 3-9 and the crank 4. The rotation from the crank 4 through the connecting rod 5 is transmitted to the rocker arm 6, which, together with the tool heads 10 mounted on it, performs translational motion along the circular arc / aa; Fig. 1 / with a feed speed about its axis and with a cutting speed of the rotary cutting tools 11. The workpiece 8 is fixed in the seat of the wheel 4 and rotates. The axis of rotation of the part 8 and the rocker 6 are located at an angle p, which determines the orientation of the grooves on the sphere and their shape. As a result of the processing, grooves on the sphere are obtained in the form of cyclic curves of various kinds. The shape of these curves / grooves / can be changed by changing the angle (p and the gear ratio U between the crank and the part. If you get one turn of a closed wavy curve along the entire spherical surface: when two turns of the crank and one turn of the part, two turns are obtained; when 2 part turns, 3 steps are obtained, etc.

The step t and the amplitude in the grooves / see Fig. 2/ can be determined:

t 360 ° / U

b arccos (cos2l + sin2lcos tr),

where I is the length of the rocker arm / length from the center of rotation to the installation site of the instrumental HEAD KI / j

1 / J is the angle of the rocker arm.

In order to reduce piece processing time and increase processing accuracy, if it is necessary to simultaneously process several grooves offset relative to each other, the tool heads 10 are mounted in the corresponding places of the rocker arm 6.

Example: During simultaneous processing on a spherical surface of three closed cyclic grooves containing each. four steps, and when the plane of symmetry of one groove coincides with the plane of the equator, and the axes of the other two, the grooves are located at an angle of 40 ° relative to the axis of the central groove, and the amplitude of the grooves, it is preferable to take the length of the beam and then 30 °. The lateral tool heads are 40 ° away from the central one. The length of the crank is + 15 °, the length of the connecting rod Il arccos (cosl0cos + sinl0sinlsln /; / 2), where lo is the length between the axes of rotation of the rocker arm and crank, which is preferably taken to 90 ° because of the convenience of using the calculation formula.

Based on the present invention, the authors made an operating model of a device for cutting two closed spherical grooves of a tractor’s spherical finger across the entire spherical surface, which, in comparison with existing samples, provides better operational characteristics.

The device allows you to simultaneously cut several closed grooves over the entire spherical surface, in which:

1. With the increase in simultaneously working tool heads, the processing time is proportionally reduced;

2. For processing each of the closed grooves on the entire spherical surface, one tool head was used, which increases the accuracy of processing;

3. The lubricant quality of the mating surfaces on the workpiece increases due to the presence of several closed grooves along the entire spherical surface;

4. Due to the reduction in the number of movable links, the design of the device is simplified.

Claims (1)

SUMMARY OF THE INVENTION A device for cutting closed curved grooves on a spherical surface of parts, comprising a tool for the workpiece and a tool head connected to a construction mechanism, which is made in the form of a crank, connecting rod and rocker articulated to each other, pivotally connected to the device body while the crank is mounted on a shaft supporting the drive bevel gear, and the tool head and link of the construction mechanism are located so that the axes of all the hinges and the axis of the head intersect at one point, characterized in that, in order to improve operational characteristics, an additional bevel gear is inserted into the device, mounted to interact with the drive gear and made with a hub having a hole designed to accommodate the device with the workpiece. AT V 2