RU1776230C - Device for dressing of burrs on plastic products - Google Patents

Abstract

Usage: stripping with high quality plastic products. SUMMARY OF THE INVENTION: the device is equipped with spring-loaded movable elements mounted around the circumference of the housing, on which the abrasive part is fixed. The housing is made with disk sidewalls, on one of the planes of which a tooth is made. The tips of the latter are directed towards each other. The diameter of one of the sidewalls is larger than the diameter of the other sidewall and smaller than the diameter of the circle passing through the periphery of the movable elements. Movable elements are placed between the sidewalls. 7 ill.

Description

The invention relates to the machining of polymeric materials and can be used to strip burrs on plastic products after extrusion or injection molding.

The closest known device is a stripper for stripping plastic products, comprising a housing, an elastic abrasive portion and an oscillation mechanism coupled to the housing.

A disadvantage of the known device lies in the fact that it does not provide the required quality of stripping of the products, since in the process of processing, the cutting part of the abrasive tool is inevitably exposed to the surface of the product, which removes the burr, which leads to a change in the dimensional parameters of the product.

The aim of the invention is to improve the quality of stripping of plastic products.

This is achieved by the fact that the device is equipped with installed around the circumference

the casing with spring-loaded movable elements on which the abrasive part is fixed, the casing comprising disk sidewalls with teeth, the tips of which are directed towards each other, and the diameter of one of the sidewalls is larger than the diameter of the other sidewall with teeth on the periphery and less than the diameter of the circle passing through the periphery of the movable elements that are placed between the sidewalls.

Figure 1 shows the device, a General view; figure 2 is a section aa in figure 1; in Fig.Z - section bB in Fig.1; figure 4 - workpiece, two projections; Fig. 5 is an arrangement diagram of an abrasive belt and sidewalls of a body; Fig. 6 is an arrangement diagram of an abrasive tool and an article during processing; Fig.7 is a view along arrow B in Fig.6.

The device attached to the spindle 1 of the machine tool comprises a mandrel 2 on which a spherical bearing 3 is mounted, fixed by a nut 4. On the bearing 3

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the tool body 5 is located with a disk sidewall, to which the bearing cover 7 is attached with screws 6. The torque from the mandrel 2 to the housing 5 is transmitted from two axial fingers 8 installed in the mandrel 2 and two radial fingers 9 mounted in the housing 5 A disk sidewall 13 is fastened to the housing 5 by means of screws 10, nuts 11 and spacer sleeves 12. The spacer sleeves 12 enter into the radial grooves of the movable elements 14, which fix the abrasive belt 15, The inner cavity 16 of the housing 5 is a magazine, which used for size stocks of abrasive tape 15 in the form of a bobbin. The movable elements 14 are covered with a rubber layer 17. On the disk sidewall 13 and the sidewall of the housing 5 there are crowns 18 and 19 with teeth, the tips of which are directed towards each other, while the tooth is also made on the periphery of the crown 18. In the case 5 are fixed flat springs 20. On an end plate 21 is fixed to the end part of the disk sidewall of the housing 5. The oscillation mechanism of the tool housing 5 includes a drive pulley 22 in which a radial bearing 23 is located located on the mandrel 2. An overlay is mounted on the protruding elements of the pulley 22 ki 24, A bracket 27 is mounted to the spindle head 25 with a bolt 26, in which the pusher 28 is located. The pusher 28 enters the hole of the nut 29. A spring 30 is located between the nut 29 and the shoulder of the pusher 28. An industrial robot is provided for moving the product 31 (not shown) with grip 32, on which rubber pads 33 are fixed.

A device for stripping burrs on plastic products operates as follows.

Mandrel 2 and pulley 22 receive rotation at different frequencies. The pads 24 located on the pulley 22 interact with the pusher 28, which has an impact on the annular plate 21 of the tool body 5. Owing to this, the housing 5 oscillates in a vertical plane passing through the axis of rotation of the tool with a frequency f of 15-30 Hz and an angle of rotation of p 1-2 °. In the initial position (Fig. 5), the outer diameters of the disk sidewalls 13 and 5 with the toothed rims 18 and 19, as well as the diameter of the circle passing through the periphery of the movable elements 14 with the abrasive belt 15 are interconnected by the ratio D1 D2 Oz, where D2 and Oz - sidewall diameters; a DI is the diameter of the circle passing

through the elements 14. The value (Di - 04 A2) is 1-3 mm and depends on the hardness of the rubber layer 17. The value (D2 - Oz Yes is 1-2 mm. The industrial robot takes with a grasp 32 a plastic product 31 from a bunker (not shown ) and moves to the processing tool at an angle of 20–40 °. The program for moving the gripper 32 of the robot is set in such a way that the radial movement of the product 31 is performed until the generatrix of the crown 19 and the nominal size of the workpiece surface 31 match (Fig. 7). there is axial movement of the article 31 into the zone brabotki, upper burr is removed teeth of the ring 18, leaving a lower portion protruding from the surface of the article 31 .. 1- 2 mm (the value of D2). In the reaction

The abrasive belt 15 with the surface being machined deforms the rubber layer 17, and the Al value becomes 0. As a result of the action of the abrasive belt 15 on the surface of the article 31, the surface is completely scraped off. The crown 19 slides along the surface to be treated and serves to provide the specified dimensional parameters of the product 31, so

as it protects the product 31 from being removed along with the burr and the material 31. If there is an error in the positioning of the robot, the product 31 is squeezed in the rubber pads 33 of the gripper 32, which does not allow

to exert excessive force pressure on the product 31 from the side of crown 19. The presence of oscillating movement of the tool body 5 allows to intensify the process of removing the upper part of the burl with the ring gear 18, and also helps to reduce the salting of the abrasive belt 15 during processing.

The implementation of the claimed method of stripping products 31 of plastic is possible

only when vibrations are applied to the tool body 5. The positioning of the article 31 during the oblique sweep is necessary to provide processing with the oscillating movement of the sweeping tool, since

with the claimed oscillation scheme, the angle of rotation p in the horizontal plane passing through the axis of rotation of the tool will be 0. To install the abrasive tape 15 on the periphery of the movable elements, it leads the edges of the tape 15 under the tooth of the crowns 18 and 19. The free end of the tape 15 is lowered inside the tool body 5. The flat springs 20 pre-tension the tape 15 around its entire perimeter. When the tool rotates under the influence of centrifugal forces, the movable elements 14 move in the radial direction. At the same time, the tops of the teeth of the crowns 18 and 19 pierce the paper or fabric base of the tape 15, thereby making it securely fixed until the abrasive tape 15 is completely worn out, its edge is pulled out from under the teeth of the crowns 18 and 19 and a new section of the tape 15 is pulled from the magazine 16 The worn portion of the tape 15 is cut off. The techniques described above are then repeated to install a new portion of abrasive belt 15 on the tool.

The device for stripping the burr on plastic products allows improving the quality of stripping, since during the stripping a regulated, determined by the design of the cutting part of the tools effect on the surface being treated, as a result of which there is no change in the dimensional parameters of the product. The absence of a separate attachment point for the abrasive tape does not cause the tool to be unbalanced with respect to the axis of rotation, which eliminates the need to balance the tool, and also reduces the dynamic loads during processing, the presence of which is negative A-M

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significantly affects the quality of stripping. In addition, the reliable fixation of the abrasive tape around the perimeter completely eliminates the possibility of its elongation during operation, which ensures a constant value.

Thus, the use of the proposed device can improve the quality of stripping of burrs on plastic products.

Claims (1)

SUMMARY OF THE INVENTION A device for stripping a grit on plastic products, comprising a housing, an elastic abrasive part and an oscillation mechanism connected to the housing, characterized in that, in order to improve the quality of cleaning of plastic products, it is equipped with spring-loaded movable elements mounted around the circumference of the housing on which the abrasive part is fixed, while the body is made with disk sidewalls, on one of the planes of which a tooth is made, the tips of the latter are directed towards each other, and to the diameter p one of the sidewalls over the other sidewall diameter smaller than the diameter and the circumference passing through the periphery of the movable elements are located between the sidewalls. LereZme G8e // ec ( Aa twenty FIG. 2 1776230 66 h FIG. U FIG. AT FugZ A2 & // Fia5 Buff in FIG. 7