RU2280539C1 - Device for working sine cylindrical surfaces - Google Patents

Abstract

FIELD: processes and equipment for working cylindrical surfaces.

SUBSTANCE: device includes body, cutter holder mounted on body with possibility of reciprocation motion along guides, follower in the form of eccentric supporting bearing assembly; clamping attachment for mounting blank; tool mounted in cutter holder by inclination angle relative to axis of follower and probe also mounted in cutter holder. Flat working surface of probe is normal relative to guides and it engages with outer surface of bearing assembly of follower. In order to enlarge manufacturing possibilities device is provided with reduction gear whose output shaft is joined with follower and whose inlet shaft is joined with clamping attachment mounted in follower with possibility of rotation. Gear ratio of reduction gear is 1/n where n - quantity of sine protrusions.

EFFECT: enlarged manufacturing possibilities of device.

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Description

The invention relates to the processing of materials by cutting and can be used in the processing of non-circular shafts and holes.

A device for processing trihedral shafts is known (see in the book S. G. Lakirev. Mathematical modeling and new principles of shaping non-circular surfaces. - Chelyabinsk: ChSTU, p. 89. 1994. - Part II.). The device consists of a housing in which a base is installed with the possibility of reciprocating motion. Based on the base, the tool holder with the tool is seated, the tool holder being installed with the possibility of reciprocating motion in a plane parallel to the plane of movement of the base, and the direction of movement of the tool holder is perpendicular to the direction of movement of the base. The tool is installed in the tool holder at an angle to the direction of its movement. The device comprises a hollow shaft, in which a shaft with a copier is mounted rotatably is mounted. The copier is in contact with the inner race of bearings mounted in the tool holder. During the rotation of the copier, the tool holder and base make movements in mutually perpendicular directions, which causes the cutting edge of the tool to make a complex movement, forming the required surface on the part. The disadvantage of this device is the inability to obtain sinusoidal cylindrical surfaces, the complexity of the copier, the low rigidity of the technological system and, as a consequence, the decrease in accuracy.

A device is known for processing non-circular cylindrical surfaces (patent RU No. 224254, 23 V 5/44, published January 27, 2005, Bull. No. 3), adopted as a prototype, comprising a housing located on the housing with a tool holder with the possibility of reciprocating motion along the guides , a copier, a clamping device installed in the copier body, and a tool located in the tool holder at an angle to the axis of the copier. A probe is rigidly fixed to the tool holder, the flat working surface of which is perpendicular to the guides and which has contact with the outer surface of the bearing mounted on a copier made in the form of an eccentric. The machine spindle, with which the copier and clamping device are rigidly connected, is given a rotational cutting movement, and the feed movement is provided to the longitudinal support on which the tool holder is mounted. During the rotation of the copier, the probe in contact with it in the radial direction moves according to the law f (t) = e · cos (ω · t), where (ω is the angular velocity of rotation of the copier, e is the eccentricity). Since the probe is rigidly connected with the tool holder in which the tool is installed, the latter will also move according to the same law. Due to this, a non-circular cylindrical surface is processed.

The disadvantage of this device is the limited technological capabilities. Since the copier and the clamping device are rigidly interconnected, the radial movement of the tool is always carried out according to the same law, i.e. the tool path for one revolution of the copier is a sinusoid with one axis of symmetry.

The technical task is to expand the technological capabilities of the device, namely the possibility of obtaining sinusoidal surfaces with n-axis of symmetry.

, где n - количество выступов синусоиды.The stated technical problem is achieved in that the device for processing sinusoidal cylindrical surfaces, including a housing, a tool holder located on the housing with the possibility of reciprocating motion along the guides, a copier made in the form of an eccentric, on which a bearing is mounted, a clamping device for mounting the workpiece, fixed in tool holder at an angle to the axis of the copier and the stylus, the flat working surface of which is perpendicular to the guides and in contact with the outside NOSTA copier bearing according to the invention is provided with a gearbox, the output shaft of which is connected to the copier, and input - with the clamping device mounted in the copier body rotatably, wherein the gear ratio is equal to

where n is the number of protrusions of the sinusoid.

Comparison of the claimed device with the known allows us to conclude that a new effect has been achieved, expressed in the possibility of processing sinusoidal cylindrical surfaces with n-axes of symmetry, since a copier in the form of an eccentric by means of a gearbox is able to rotate n times faster than the installation and clamping device, so the top of the tool located in the tool holder, for one revolution of the clamping fixture will be located n times at the maximum distance the distance from the axis of the mounting fixture and n times at a minimum distance.

The invention is illustrated in the drawing, which shows a General view of a device for processing sinusoidal cylindrical surfaces.

A device for processing sinusoidal cylindrical surfaces consists of a housing 1, fixedly mounted on the transverse support of a lathe, a tool holder 2 installed in the housing 1 with the possibility of reciprocating movement along the rolling guides 3. In the tool holder 2, a tool 4 is installed with the possibility of adjustment, the axis of which is located at an angle β to the axis of the copier 5. A probe 6 is rigidly fixed to the tool holder 2, whose flat working surface A is perpendicular to the guides 3 and which has contact with the outer surface of the bearing 7 mounted on the surface B of the copier 5. Between the housing 1 and the tool holder 2, pressure springs 8 are irregular to ensure constant contact between the copier 5 and the probe 6. The copier 5 is an eccentric sleeve and is rigidly connected to the output shaft 9 of the gearbox 10. Output the shaft 9 is mounted for rotation on the input shaft 11. On the input shaft 11 of the gearbox 10 is a clamping device 12 for installing and securing the workpiece.

The device operates as follows.

- передаточное отношение редуктора), за счет чего и происходит обработка синусоидальной цилиндрической поверхности с n выступами.The input shaft 11 of the gearbox 10 is installed in the spindle of the lathe. The workpiece is fixed in the clamping device 12, for example, in a collet chuck located on the output end of the input shaft 11. The tool 4 is installed in the tool holder 2, adjusted to the required size and fixed. By moving the transverse caliper, a probe 6 is mounted on the tool holder 2 on the outer surface of the bearing 7. Permanent contact between the probe 6 and the surface of the bearing 7 is provided by springs 8, the total elastic force of which compensates for the resulting inertial forces and radial cutting forces. The spindle of the machine is given a rotational movement of cutting, and the longitudinal support - the movement of feeds. As a result of the touch of the probe 6 of the tool holder 2 of the working surface of the bearing 7 mounted on the surface B of the copier 5, which receives rotational movement from the machine spindle through the gearbox 10, the angular speed of the copier being n times greater than the angular speed of the spindle, the tool holder 2 is radially moved with tool 4 in the housing 1 along the guides 3 according to the law f (t) = e · cos (n · ω · t) (ω is the angular velocity of rotation of the clamping device, e is the eccentricity,

- gear ratio), due to which the sinusoidal cylindrical surface with n protrusions is processed.

Using the proposed device will allow you to get a variety of sinusoidal cylindrical surfaces when using simple copiers, for example, in the form of circles.

The invention can be used in technological systems used for processing non-circular cylindrical surfaces profiled by a sinusoid, for example, for the manufacture of work surfaces of parts of rotary piston machines, as well as parts of profile joints.

Claims (1)

A device for processing sinusoidal cylindrical surfaces, including a housing located on the housing a tool holder with the possibility of reciprocating motion along the guides, a copier made in the form of an eccentric, on which a bearing is mounted, a clamping device for mounting the workpiece, a tool fixed in the tool holder at an angle to the axis of the copier and a probe, the flat working surface of which is perpendicular to the guides and in contact with the outer surface of the copier bearing, characterized in that it has abzheno reducer, the output shaft of which is connected to the copier, and input - with the clamping device mounted in the copier body rotatably, wherein the gear ratio is 1 / n, where n - the number of sinusoids protrusions.