SU1288028A1 - Helically grinding machine - Google Patents

Abstract

The invention relates to the field of machine tool construction and can be used for grinding discs of lathe chucks made with an involute spiral with variable evolute. The purpose of the invention is the expansion of technological capabilities by processing a family of involute spirals with variable evolute. The machine includes a spindle 2, kinematically associated with a spiral copier (K) 5. The latter interacts with the finger 6, which is mounted on hydrostatic bearings and can be rotated around an axis parallel to the axis of the spindle 2. When interacting with the spiral K 5, made according to the involute by a constant evolute, the finger 6 transmits movement to the grinding wheel 11. For processing the family of spirals with a variable evolute, the machine is equipped with a device for angular orientation of the product 3 relative to the beginning of the spiral K 5. The device you olneno as a magnetic chuck gridded and angular position indicator. This orientation provides a different pitch of the helix along the cutting height. In order to shorten the set-up time, the finger 6 is made with g two working surfaces 7. 1 Cp ff, 4 slugs. (L o 00 00 oo o Fyl

Description

The invention relates to a machine tool industry and can be used for grinding discs of lathe chucks made with an involute spiral with variable evolute.

The purpose of the invention is the expansion of technological capabilities through the processing of a family of involute spirals with variable evolute. The machine also provides shortening of changeover time.

FIG. 1 shows the scheme of the proposed spiral grinding machine; in fig. 2 — node I in FIG. one; in fig. 3 is a diagram of the installation of the workpiece on a magnetic cartridge; in fig. 4 - machine copier

On frame 1 (Fig. 1), a spindle 2 of article 3 is mounted, connected by a kinematic 15 chain 4 to a spiral copier 5, made according to an involute with a constant evolute, and interacting with a contact finger 6 with two working cylindrical surfaces 7.

The availability of the machine copy mechanism increases.

The translational movement of the contact finger 6 in the direction perpendicular to the axis O2-O2 synchronously repeats the associated tool support 10 and the grinding wheel 11.

Due to the centrifugal force of the inertia of the turns of the copier arising from the rotation of the spindle 2 to the position of the contact finger 6, the pitch of the cut helix on the product 3 changes in proportion to the radius of the spiral cutting of the copier.

In fact, on the spiral disk-product 3, a variable evolute involute is cut, having a variable pitch along the cutting height.

At the initial installation of the grinding wheel 11 on the radius r, the radius of the evolute is ga const. However, when the rotation of the product 3, mounted on the magnetic cartridge 12, g and const due to release

The contact pin is installed (Fig. 2) on 20 d by the action of centrifugal forces of that part of the two hydrostatic bearings 8 friction mounted in the housing of the pusher 9. As the need arises, a second contact pin can be put into operation.

ka spiral, which is set on the grinding wheel 11.

Obtaining a gamut of involute spirals with variable evolutes, -having variables. On the base 1, there is an instrumental cutting step 25 in height, provided with a support 10, carrying the grinding wheel 11, with which the product is processed. The spindle 2 is provided with a device for securing the product and its angular orientation relative to the beginning of the helix of the copier.

by changing the orientation of the beginning of the helix of the workpiece relative to the beginning of the helix of the copier. Varya angle a (Fig. 3) by installing spiral disks on the magnetic grid

The device, which is a magnetic cartridge, can choose the desired algon cartridge 12 with a coordinate grid 13 and a position indicator 14.

The contact finger 6 has a free rotation around its axis Oi-Oi, parallel to the axis of the spindle O2-O2.

The working profile of the spiral copier 5 35 is made according to an involute with a constant evolute. The working profile of the contact finger has a cylindrical surface.

Spiral grinding machine works as follows.

the rhythm of the change of the pitch of the helix along the cutting height. If the beginning of the helix (point A in Fig. 4) of the copier relative to the abscissa axis is determined by the angle p, then the beginning of the helix (point L in Fig. 4) of the disk to be ground is displaced relative to the abscissa axis by the angle a.

Claims (2)

1. A spiral grinding machine including a spindle for machinable. Spindle 2 of product 3 is driven by a kinematically connected 45 rotation of the kinematic chain 4. Together with the spindle spiral coil 5 is rotated, made according to an involute with a constant evolute. The contact pin 6, which interacts with the copier, rotates in hydrostatic bearings 8 from friction forces arising in the contact zone of the working surface 7 with the copier 5. The contact pin 6 performs translational movement together with the tool carrier 10 in the direction perpendicular to the axis O2-O2. In connection with minimal wear of the contact pin b in hydrostatic sub-platforms 8 with minimal wear under conditions a spiral copier made on an involute with a constant evolute and intended to interact with a finger mounted to rotate around an axis parallel to the axis of the spindle for a product kinematically associated with an instrument, characterized in that, in order to expand technological capabilities by processing the family variable evolute spirals, the machine is equipped with a device mounted on the spindle for angular orientation of the workpiece, relative to the start of the copier helix. 2. The machine according to claim 1, characterized in that, in order to reduce the time of re-thinning of the working surfaces 55 of the setup, the finger is made with two working 7 in the zone of contact with the copier 5 with operable cylindrical surfaces. The availability of the machine copy mechanism increases. The translational movement of the contact finger 6 in the direction perpendicular to the axis O2-O2 synchronously repeats the associated tool support 10 and the grinding wheel 11. Due to the centrifugal force of the inertia of the turns of the copier, arising from the rotation of the spindle 2, on the position of the contact finger 6, the pitch of the cut helix on the product 3 varies in proportion to the radius of the spiral cutting of the copier. In fact, on the spiral disk-product 3, a variable evolute involute is cut, having a variable pitch along the cutting height. At the initial installation of the grinding wheel 11 on the radius r, the radius of the evolute is ga const. However, when the rotation of the product 3, mounted on the magnetic cartridge 12, g and const due to release e by the action of centrifugal forces of that part of the helix relative to which the grinding wheel 11 is exposed. The acquisition of a gamut of involute spirals with variable evolute, having a variable pitch cutting step, is achieved by changing the orientation of the beginning of the helix of the workpiece relative to the beginning of the helix of the copier. Varya angle a (Fig. 3) by installing spiral disks on the magnetic grid  cartridge, you can select the desired algorithm for changing the pitch of the helix along the cutting height. If the beginning of the helix (point A in Fig. 4) of the copier relative to the abscissa axis is determined by the angle p, then the beginning of the helix (point L in Fig. 4) of the disk to be ground is displaced relative to the abscissa axis by the angle a. Invention Formula 1. A spiral grinding machine including a spindle for the workpiece, kinematically connected with five 0 a spiral copier made on an involute with a constant evolute and intended to interact with a finger mounted to rotate around an axis parallel to the axis of the spindle for a product kinematically associated with an instrument, characterized in that, in order to expand technological capabilities by processing the family variable evolute spirals, the machine is equipped with a device mounted on the spindle for angular orientation of the workpiece, relative to the start of the copier helix. 2. The machine according to claim 1, characterized in that, in order to reduce the re-adjustment time, the finger is made with two working cylindrical surfaces. FIG. 2 12 P / J (par.Z ig.