DD298614A5 - METHOD AND DEVICE FOR TRACKING COMPACT GRAPHITE BASED MATERIAL ON ANDRUCK ELEMENTS OF TWO-SIDED BROADBAND CONTACT GRINDING MACHINES - Google Patents

Abstract

The invention relates to a method and a device for dressing compact sliding material on pressure elements of double-sided broadband contact grinding machines for the purpose of leveling with wear phenomena and thus prolonging the life and quality assurance. For this purpose, the grinding belt belonging to the dressing pressure element to be dressed and the pressing element opposite are removed. For the remote pressure element, a dressing device is used, which consists of a flat ground metal plate, which is mounted on a corresponding to the pressure element guide. The pressure element to be dressed is driven against the remaining, rotating abrasive belt and, if necessary, sanded with the aid of a grip piece with reciprocating motion. Thus, a periodic leveling of the sliding material is possible with little effort. Fig. 1 {method; Device; dressing; pressure element; compact sliding material; Graphite base; Broadband Contact grinding machine; Verschleiszerscheinungen; Standzeitverlaengerung; Quality control; regeneration; Sanding belt; Griffstueck}

Description

As a device for dressing compact sliding material based on graphite on pressure elements of two-sided Breitbandbandkontaktuchleifmaschinen a flat ground metal plate is used, which is applied to a guide. The guide consists of a rail and a spacer between rail and metal plate. It is adapted to the mounting rail for the pressure element. With the guide the flat ground metal plate is pushed onto the support rail.

With this device, a low-tolerance leveling of the sliding material is secured. The replacement against the pressure element is done in a few steps. A provided on the pressure element handle allows the reciprocation of the Andruckelementes during the dressing process, so that even with the usually present, compared to the dressing pressure element to be dressed smaller grinding belt width to be dressed Andruckelement over the entire surface can be leveled evenly.

exemplary

The invention is explained in more detail below using an exemplary embodiment. In the accompanying drawing shows

Fig. 1: the schematic representation of a prepared for dressing the lower sanding shoe two-sided broadband contact grinding machine

Fig. 2: the same as Fig. 1, but for dressing the upper shoe shoe Fig. 3: the schematic diagram of a dressing device.

On a two-sided working with sanding shoes broadband contact grinding machine both sanding shoes 1 with plate-shaped, 20 mm thick, impregnated with synthetic resins electrographite as a sliding material 2 fitted. There are 1250mm wide chipboard with 1350mm wide sanding belt 3 finely sanded. After about eight hours, it is recommended due to the wear to level the sliding layer 2 of both sanding shoes 1, which can be started either with the upper or lower. In the present example, first the upper sanding pad 1 is to be processed. For this purpose, first the sanding belt 3 of the upper grinding head is relaxed and withdrawn from the contact roller 4 and the guide rollers 5. Thereafter, the machine head is adjusted in height so that the passage thickness a is reduced to a minimum, so that the contact between the to be dressed pressure element and the abrasive belt 3 can be made. The sanding pad 1 of the lower grinding head is pulled out and instead the dressing device 6 is pushed. Then the lower grinding head must be put into operation. For this purpose, the upper sanding shoe 1 to be dressed is slowly brought up by means of height adjustment to the revolving sanding belt 3 and dressed. Since the Sch'difschuh 1 is wider than the sanding belt width plus oscillation weigh, the sanding shoe 1 to be dressed is moved back and forth several times during the dressing process by a distance of about 50 mm. Set serves for this purpose on Kink> ^r 1 shoe mounted handle. It causes in contrast to the conventional grip of the sanding pad no limitation of the insertion path, whereby the leveling required for reciprocating motion is made possible. If the sliding coating 2 of the upper sanding pad 1 is leveled, the dressing device β is again exchanged for the removed sanding pad 1 and the sanding belt 3 is raised.

The subsequent leveling of the sanding pad 1 from the lower grinding head is carried out in the same way. The dressing device 6 required for tin dressing consists of a ground steel plate 7. On this steel plate, by means of screw connection 3, a guide is fastened consisting of a spacer 9 and a rail 10 It can thus be slid onto its support rails analogously to the sanding shoes 1. The dimensions correspond to those of the sanding pad 12. They are 12 mm thick, 1400 mm long and 140 mm wide over the entire pressure surface with the same force presses against the sliding layer 2 and thus enables a uniform leveling.

Claims (3)

1. A method for dressing compact sliding material based on graphite on pressure elements of two-sided broadband contact grinding machines, characterized in that the to be dressed Andruckelement (1) belonging abrasive belt (3) and the dressing to be dressed pressure element (1) opposite pressure element (1) are removed that for the remote pressure element (1) a dressing device (6) is used, that thereafter to be dressed pressure element (1) with the side to be dressed against the remaining, rotating abrasive belt (3) and after contact as long as necessary, with reciprocation, is ground until the existing wear profile is leveled. 2. Apparatus for dressing compact sliding material on graphite base on pressure elements of double-sided broadband contact grinding machines, characterized in that on one of a rail (10) and a spacer (9) existing, the support rail for the pressure element matched guide a ground metal plate (7) is applied and that this metal plate (7) is pushed with the guide on the support rail. For this 3 pages drawings Field of application of the invention The invention relates to a method for dressing compact sliding material on as sanding shoe, pressure shoe, pressure bar, contact shoe, etc. designated pressure elements of two-sided operating broadband contact grinding machines. Characteristic of the known state of the art The flat support of the abrasive belts is associated with increased frictional forces between the stationary pressure element and revolving belt, since the Zerspankräfte must be transmitted to the contact zone pressure element / tape. To reduce the frictional forces are coated with graphite-coated fabric. These so-called graphite slip bands are applied as the last layer to the pressure element, which generally comprises a metal cross-member and a felt covering. The quality of the pressure element, in particular the uniformity in the pressurization of the sanding belt, greatly influences the achievable sanding quality. Due to the sliding movement of the abrasive belt during the Schloifprozesses the graphite slip is mechanically stressed and subject to relatively rapid wear. It must be replaced after a service life of 15 to 25 operating hours. The structure felt / graphite slip also causes thickness variations, especially in the edge zone area of the abrasive due to compression of the felt and wear and tear. An attempt has already been made to use a compact sliding material based on graphite instead of the graphite sliding strip, thereby lengthening the stand. Although the sliding material remains intact even when worn due to the compact material, continuously increasing tracking due to the ever-increasing wear causes the compact sliding material to hitherto not be used effectively for reasons of quality. With a recognizable, disturbing trace formation on the grindings of this sliding material is unusable. This can happen within 8 hours. A regeneration can only outside the grinding machine by manual processing, for. As done planing and is not performed because of the high cost and high tolerances in the rule. - Object of the invention The present invention has the aim to significantly extend the service life of graphite-based lubricants for pressure elements while ensuring a sufficiently good quality grinding with respect to the surface texture and thickness dimensional stability. Explanation of the essence of the invention The object of the invention is to allow with little effort a periodic leveling of the wear profiles of a compact sliding material on graphite basis by dressing while maintaining minimum tolerances. According to the invention the object is achieved in that for dressing a compact sliding material based on graphite on pressure elements of two-sided broadband contact grinding machines first belonging to the dressing pressure element abrasive belt is removed. Thereafter, the pressure element to be rectified dv.ti opposite pressure element is removed and used for a dressing device. Now, in the grinding machine on the one hand, a grinding belt with a dressing instead of the pressure element and on the opposite side only to be dressed Andruckelement. This is driven with the side to be dressed against the remaining, rotating abrasive belt and after contact as long as necessary, reciprocated, sanded until the existing AbnuUungsprofil is leveled, After replacing the dressing device against the removed pressure element and the mounting of the removed abrasive belt the grinding machine is ready for use again for the actual grinding material.