SU528183A1 - Belt sanding device for processing curved surfaces - Google Patents

Description

one

The invention relates to belt grinding machines for machining curved surfaces, preferably feather blades of gas turbine engines.

Belt grinding machines for processing curvilinear surfaces are known, which contain a contact copier that is equidistant to the thickness of the surface to be machined, a plunging feed mechanism and a tape drive mechanism that causes the belt to rotate at a grinding speed.

Such devices are simple in design and have high machining accuracy, achieved due to the absence of complex formative movements of the part and the tool. However, the known devices allow only concave surfaces, such as a blade trough, to be treated. Convex surfaces, such as the tip of a blade blade, cannot be machined on known devices, since this requires a concave contact copier, which cannot be beaten around with a tensioned sanding belt.

The purpose of the invention is to provide the possibility of processing convex surfaces.

For this, the proposed device is equipped with a shaft on which the contact copier and the workpiece are mounted on one side of its axis, and also mounted

a feed mechanism for piercing and a tape-driving mechanism associated with the drive of its rotation, with the working surface of the contact cam facing the axis of rotation of the shaft.

When the shaft rotates, the grinding belt with centrifugal forces is pressed against the working surface of the contact copier, which allows it to be concave and, therefore, to process convex surfaces.

To simplify the construction of the tape mechanism, it is made in the form of a driving pulley connected with a roller mounted on one arm of a two-armed lever, the second arm of which is provided with a weight under

the action of centrifugal force pressing the roller to the fixed ring provided in the device. At the same time, the plane of rotation of the grinding belt is perpendicular to the axis of rotation of the shaft.

In order to simplify the design of the part feeding device for plunging, it is made in the form of a wedge mounted on a shaft with the possibility of axial movement interacting with a roller mounted on a lever inserted into the device carrying the workpiece.

FIG. 1 shows the proposed device in a plane passing through the axis of rotation of the shaft; in fig. 2 - section along AA

FIG. one.

The contact copier 1 is mounted on the shaft 3 with the help of the bracket 2. The workpiece 4, together with the basic iris, is mounted on the rocker arm 6, the swing axis 7 of which is mounted on the shaft 3 with the aid of the bracket 2 Grinding belt 8 is placed on the guide rollers 9 and 10 one of which is tension. The rollers are fixed on the bracket 2 so that the plane of rotation of the abrasive tape is perpendicular to the axis O of rotation of the shaft 3. This greatly simplifies the design of the drive mechanism of the tape containing a roller And, on the axis 12 of which the roller 13 is fixed, interacting with the fixed ring 14 due to forces friction. The housing 15, in which the axis 12 rotates, is 16-hingedly mounted in the brace 12 and is a two-armed lever, at the second end of which a weight 17 is installed, under the action of centrifugal force, the pressing roller 13 to the stationary ring 14.

A lever 18 is mounted on the lever 6, which interacts with a wedge 19 and is able to move along the axis of the shaft 3. The wedge moves through the axle and housing 20, for example, from a screw 21, at the end of which a manual feed handwheel 22 is installed. The shaft 3 is driven into rotation through a V-belt transmission 23 directly from the electric motor or through a gearbox. The shaft 3 is stopped by any device known and intended for this, such as a friction brake 24.

When the device is working together with the shaft 3 around its axis O, the contact copier 1 rotates, the workpiece 4 and the abrasive tape 8. A section of tape B With centrifugal force is pressed against the concave working surface of the contact copier 1. The roller 13 is due to the centrifugal force of the load 17 and the two-armed lever 15, which rotates around axis 16, presses against the stationary ring 14 and, by rotating the shaft 3, rotates the abrasive belt 8. This does not require a special driving motor, etc., which greatly simplifies the drive mechanism m. The infeed part 4 is driven through by the centrifugal force of the lever, which tends to rotate around the axis 7. The rotation is limited by the roller 18 and the wedge 19 by moving the latter along the shaft axis by rotating the handwheel 22. Using centrifugal force to implement the infeed feed simplifies the machine design.

Claims (3)

1. A tape-grinding device for processing curvilinear surfaces containing a contact copier that is equidistant to the thickness of the surface to be machined, the infeed feed mechanism and the tape mechanism, characterized in that, in order to enable the processing of convex surfaces, it is provided with a shaft the side of which is mounted a contact conier, as well as a feed mechanism for a piercing and a tape-driving mechanism connected with the drive of its rotation, while the working surface of the contact The copier is facing the axis of rotation of the shaft. 2. A device according to claim 1, characterized in that the tape mechanism is made in the form of a drive jaw associated with a roller mounted on one arm of a double-arm lever, the second arm of which is equipped with a load, which, under the action of centrifugal force, presses the roller into the stationary device the ring, wherein the plane of rotation of the tape is perpendicular to the axis of rotation of the shaft. 3. The device according to claim 1, characterized in that the mechanism for feeding the part to the incision is made as mounted on the shaft with the axial displacement of the wedge interacting with the roller mounted on the device inserted into the device carrying the workpiece. . j u ///////, .. / g /// 7 //// 7 / L //////// 777А У / Fig 2 / 3