Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
  • B24B31/12—Accessories; Protective equipment or safety devices; Installations for exhaustion of dust or for sound absorption specially adapted for machines covered by group B24B31/00
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
  • B24B31/10—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving other means for tumbling of work
  • B24B31/108—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving other means for tumbling of work involving a sectioned bowl, one part of which, e.g. its wall, is stationary and the other part of which is moved, e.g. rotated

Definitions

• the invention relates to a grinding machine for grinding material to be ground by means of grinding bodies, with at least one grinding unit with two parts which can be rotated relative to one another.
• centrifugal mass finishing machines consist of a two-part container with a bowl-like rotatable, bottom-forming container lower part and a stationary cylindrical container upper part.
• Such grinding machines are used for the surface processing of material to be ground, for example of smaller parts and workpieces, which is moved in the container together with grinding bodies and, if appropriate, a liquid processing agent. If the lower part is rotated, the workpieces to be treated are moved outwards on the plate until they hit the inner wall of the Impact container on which they are braked. Subsequent workpieces result in a rotating workpiece movement, which results in intensive grinding or polishing.
• the invention has for its object to provide a simply designed and inexpensive centrifugal vibratory grinding machine that works reliably with a low susceptibility to wear and has a long service life.
• this object is achieved with a centrifugal slide grinding machine, in particular a polishing machine, of the type mentioned at the outset by means of a stationary container for holding abrasive material and a rotatable plate arranged above a container base to form a finite gap to the container wall.
• the plate is also spaced from the bottom of the container.
• An extremely preferred embodiment sees the characterizing part of claim 12. This ensures that particles can get under the plate that are significantly smaller than the distance between the plate and the floor.
• the grinding machine according to the invention is designed as a liquid grinding machine with a liquid processing agent contained in the container, it can be provided in a preferred embodiment that the entire plate is rigid. In a further embodiment, it is provided in this case that the width or thickness of the gap is at least 1/10 mm, it should generally not exceed 2 mm. It has surprisingly been found that in a centrifugal slide grinding machine according to the invention with liquid in the container, it is driven out of the gap between the rotatable plate and the bottom of the stationary container and there is no liquid there. This prevents the abrasive material, even broken fragments, of larger abrasive particles from getting into this area and thus impairing the mounting of the plate or the drive axis of the plate which is guided outwards through the base.
• Abrasive grains or fractions thereof or expulsion of the same from the gap between the rotatable plate and the stationary base can be achieved in a dry centrifugal grinding machine, that is to say a dry grinding machine, in that the plate has flexible material at least on its underside.
• This configuration of the plate according to the invention also ensures that if a particle of grinding material or material to be ground penetrates into the gap is only conveyed outwards again by the relative rotary movement between the plate and the container bottom, but no wear occurs due to the flexibility of the plate or its underside and, in particular, the storage of the plate is prevented from being impaired.
• the invention enables the construction of very inexpensive and reliable centrifugal centrifugal grinding machines which also allow the use of very fine grinding and / or polishing bodies.
• a drive axis of the grinding plate is guided liquid-tight through the bottom of the container.
• the plate or the covering on its underside can consist, for example, of an elastomeric plastic and in particular rubber, but also of felt, cotton fabric or a normally flexible floor covering, such as PVC floor covering, carpeting of any kind.
• the plate has an upwardly drawn peripheral edge.
• the plate has a flat floor over most of its surface; only the edge is pulled up a little, so that a peripheral edge protruding beyond the plate base is provided thereon.
• the gap can in particular also be larger than that minimal dimensions of grinding or polishing be body particles, but it remains in the order of magnitude, in particular should not be more than double or triple, so that they move under the plate during operation of the grinding machine and loosen again due to the relative movement of the flexible rotating plate with respect to the container bottom and radially after can be transported outside in the direction of the container wall.
• the gap should also be very small.
• the width b of the gap in the case of coarser granules is preferably at least 2 mm and most preferably approximately between 3 and 4 mm.
• the gap width can in particular also be variable in order to adapt the gap to the granulate used.
• the gap can be adjusted by any known means, for example by means of washers or the like that can be inserted between the container bottom and the plate.
• the gap can also be adjustable, for example, by means of adjusting screws, by means of which a shaft passing through the container bottom for supporting the flexible plate can be adjusted in height and fixed at any height.
• the container can also be height-adjustable with respect to the plate and can be fixed at a desired height.
• a further preferred embodiment is characterized in that a closable outlet is provided below the plate in the bottom of the container.
• the housing is in one piece, in particular the housing and / or the container being made of plastic.
• the grinding machine according to the invention can be manufactured economically and thus inexpensively.
• the gearbox is located below the plate.
• the drive is designed as a geared motor with an integrated gear, in which case the motor in particular is aligned vertically with its axis and an output shaft emerges at the lower end of the motor and the top of the motor is essentially at the same height is the top of the container.
• a plurality of grinding units can optionally be present in a machine with little design effort, for example in order to enable the rational processing of heavier and / or shock-sensitive workpieces, which allow several to be processed together
• a grinding machine according to the invention can be used in particular for dry polishing jewelry, dental parts, etc. The invention is explained in detail using a preferred embodiment with reference to the drawing. It shows:
• Figure 1 shows a container of a centrifugal vibratory grinding machine according to the invention.
• FIG. 3 shows a further embodiment of a grinding machine according to the invention in a side view
• Fig. 4 shows the essential parts of the glider according to Figure 3 in vertical section.
• the grinding unit 1 shown in FIG. 1 of a centrifugal centrifugal grinding machine in the form of a plate centrifugal machine has a container 2 with a rotatable plate 3. If the plate is rigid, liquid is used in the container.
• the plate - for wet and dry processing - can be made of a flexible material, such as rubber.
• the plate is driven by a shaft 3a.
• the shaft 3b penetrates, preferably liquid-tight, a container base 2a and is rotatably mounted on the latter via bearings 4.
• the plate 3 is spaced from the container bottom 2a to form a gap 5, the gap width b being about 3 mm, for example, in dry machining.
• the plate 3 and / or the container 2 can, for. B. can be arranged in a height-adjustable manner by varying the gap width b.
• the comparatively wide gap 5 enables small particles of the grinding material or in particular the grinding body to get between the plate 3 and the container base 2a, these being conveyed again in the direction of the container wall 2b due to the rotating flexible plate 3, without any significant Wear of container bottom 2a or plate 3 occurs. Furthermore, due to the flexible plate 3, the generation of frictional heat is largely prevented in that grinding wheels which have passed under the plate 3 are not crushed, but are conveyed radially outward.
• a grinding machine according to the invention has in particular several, e.g. more than 30 units, which ensure rational, separate processing of relatively heavy (e.g. heavier than 10 g) and / or shock-sensitive workpieces.
• the diameter D of the container 2 can e.g. about 45 cm.
• FIG. 2 shows another embodiment of a grinding machine according to the invention, which is structurally simple and can therefore be manufactured at low cost and offered inexpensively, so that it can also be used in the private sector to polish up private jewelry.
• the grinding machine 1 of FIG. 2 has a one-piece housing 2 ', which is preferably made of plastic, so that in particular the container 2 is also made of plastic.
• a plate 3 is arranged in the container 2.
• the plate 3 has a circumferential edge 3a drawn obliquely upwards, the outer wall of which follows the contour of the container in this area, so that a radial end between plate 3 or its peripheral edge 3a and container 2 or container wall 2b. rather gap 5 is formed, which has essentially the same dimension over its entire height.
• the cup edge 3a is pulled upwards and creates a bowl-shaped receptacle for the grinding material.
• the drive shaft 3b for the plate 3 leads through the container bottom 2b. This is coupled to an output shaft 12a of a gear 12, which is centered by a centering ring 12b.
• the drive 11 is designed as a geared motor 14, in which the motor 13 and gear 12 are integrated with one another. Accordingly, not only the transmission 12 but also the drive motor 13 is arranged below the container 2 in a foot 2c of the housing 2 *.
• the geared motor 14 is fastened to the housing 2 ', more precisely to the container base 2b, by means of screw connections 14a.
• FIGS 3 and 4 show a further embodiment of the invention, in which the grinding machine according to the invention is also simple in construction and thus inexpensive to manufacture.
• the housing 2 has a foot 2c, which, however, is not formed in one piece with the container 2. Rather, the container 2 is attached to the foot 2c in a manner to be explained.
• a motor 13 is arranged on the side of the container 2 and the foot 2c in such a way that the output shaft of the motor 13 (itself not shown) exits the motor 13 downwards.
• the gear 12 is also arranged below the motor 13, wherein the drive 11 can also be designed as a gear motor 14.
• the upper side of the motor 13 is essentially at the same height as the upper edge of the container 2.
• a protective wall 16 is provided, which is preferably guided around the container 2 in the form of a partial arc, in particular in the form of a half arc.
• the wall area of the container 2 facing the motor 13 can also be made higher than the wall area of the container 2 facing away from the motor 13 in order to produce such a protective wall effect.
• a closable opening 15 is also provided in the container base 2b, through which the grinding material which may have got under the plate 3 can be removed.
• a U-shaped bracket 17 is provided in the base 2c of the housing 2 'and is attached to the base 2c of the housing with its legs. It carries the container 2 with its web.
• a drive axle 3b for the plate 3 leads through the base 2b and the web of the bracket 17 into the gear 12, that of its parts directly under the motor 13 to the center under the container 2 is sufficient by appropriate intermediate gears or other types of gear designs such as by serrated belts, etc. are provided.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
• Disintegrating Or Milling (AREA)
• Mechanical Treatment Of Semiconductor (AREA)
• Crushing And Grinding (AREA)
• Polishing Bodies And Polishing Tools (AREA)
• Liquid Crystal (AREA)
• Surgical Instruments (AREA)
• Inorganic Insulating Materials (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7901605

Family Applications (1)

Country Status (7)

Families Citing this family (5)

Family Cites Families (10)

• 1999
  • 1999-03-19 DE DE19912348A patent/DE19912348A1/de not_active Withdrawn
• 2000
  • 2000-02-29 ES ES00907648T patent/ES2216865T3/es not_active Expired - Lifetime
  • 2000-02-29 WO PCT/EP2000/001675 patent/WO2000056501A1/fr not_active Ceased
  • 2000-02-29 AU AU29163/00A patent/AU2916300A/en not_active Abandoned
  • 2000-02-29 DE DE50006075T patent/DE50006075D1/de not_active Expired - Lifetime
  • 2000-02-29 EP EP00907648A patent/EP1163084B1/fr not_active Expired - Lifetime
  • 2000-02-29 US US09/701,338 patent/US6899605B1/en not_active Expired - Fee Related
  • 2000-02-29 AT AT00907648T patent/ATE264164T1/de not_active IP Right Cessation

Non-Patent Citations (1)

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