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
  • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
  • B24B7/20—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground
  • B24B7/22—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain
  • B24B7/24—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain for grinding or polishing glass
  • B24B7/241—Methods
• • 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
  • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
  • B24B7/20—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground
  • B24B7/22—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain
  • B24B7/24—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain for grinding or polishing glass

Definitions

• This invention concerns a method whereby the operations of grinding and polishing glass surfaces, particularly plate glass sur-.
• the first is commonly a rinding tool made of cast iron.
• This tool first carries out the coarse grinding, employing coarse-grain sharp grinding means such as sand, and then the fine grinding with the assistance of a grinding agent which is as fine as possible, that is sand-sludge and emery-sludge, which are applied one after the other.
• a grinding agent which is as fine as possible, that is sand-sludge and emery-sludge, which are applied one after the other.
• the polishing is performed with a second tool consisting of resilient material such as wood, pitch, leather, felt, cloth and the like, said tool rubbing the polishing agent, particularly red iron oxide (polishing red), on the glass surface oper ated upon until the requisite high degree of brilliance is obtained.
• the present invention which enables the total time for the grinding and polishing to be reduced to about a half consists in subject ing the glass surfaces to be treated, after the fine grinding, first to a preliminary polishing by separate polishing tools, fine sludge material being employed, and only then to a final brilliant polishing by means of other polishing tools employing, for example, polishing red.
• the difference from the known methods resides therefore in the interpolation of a sep arate polishing operation, that is a prelimi-, nary polishing operationwith separatepolish ing tools.
• a soft material such as felt, wood, pitch, leather, cloth, orthe like is again employed as a polishing tool and a very fine sludge material as the polishing agent.
• the latter may for instance consist of a fine sand or emery residue of which the rains are so small that it is no longer possilfie to employ it in grinding because direct contact between the metal grindin tool and the glass surface might occur.
• uch fine grinding material is nevertheless extremely well adapted for use in the preliminary polishing with soft polishin tools and when employed the time occupie by the entire polishing operation is considerably shortened.
• the preliminary polishing is effected in a considerably more energetic manner than is the case with 95 polishing red which is a very Weak polishing agent and is, generally speaking, particularly suitable for the final brilliant polishing only.
• the final brilliant polish is therefore obtained with the aid of polishing red.
• the same polishing tool is however, not employed but, as in coarse and e rinding, the final brilliant polishing is e ected with theaid of other soft polishing tools. In this manner a further considerable economy in time is achieved because it is unnecessary to wash out the polishing tool carefully between the operation.
• WhlCh compared with the 108 minutes of the previous method, represents a reduction to about one half.
• the method of the present invention may also be app-lied to the continuous grinding and polishing process, recently adopted in the plate glass industry, wherein the glass is fed forward on tables forming a continuous band under a plurality of grinding tools each of which operates with a differently grained sand or sludge and is then treated in a similar manner by polishing tools employing polishing red.
• polishing tools employing polishing red.
• soft polishing red operated u p15 by a polishing felt is immediately app 1e Consequently the present method may again be employed with success.
• a fine sand or emery sludge is employed as a polishing agent.
• the first polishing tools consist of suitable resilient material an eflicient preliminary polishing of the glass surface is effected so that the final felt tool may then fulfill its original purpose, namely, to impart to the glass a polish with a high degree of brilliance in the minimum time.
• the length of the tables may be materially reduced in consequence of the reduction in the number of polishing tools so that the machine as a whole occupies considerably less space, is more easy to construct and requires an expenditure of less power.
• the method of treating glass surfaces which consists in grinding and smoothing said surfaces, then subjecting them to a preliminary polishing operation performed with softer tools and abrasive materials used for rinding and smoothin said materials having first been reduced y the grinding and smoothing operations to a degree of fineness in which they can no longer be applied by hard grinding. tools, and finally giving the finalpolish to said surfaces.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Ceramic Engineering (AREA)
• Inorganic Chemistry (AREA)
• Mechanical Engineering (AREA)
• Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
• Polishing Bodies And Polishing Tools (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=6578317

Family Applications (1)

Country Status (5)

Cited By (3)

Families Citing this family (2)

• 0
  • BE BE338370D patent/BE338370A/xx unknown
• 1926
  • 1926-01-01 DE DEP52008D patent/DE476158C/de not_active Expired
  • 1926-12-30 FR FR626896D patent/FR626896A/fr not_active Expired
  • 1926-12-30 GB GB32945/26A patent/GB263858A/en not_active Expired
• 1927
  • 1927-01-22 US US162923A patent/US1697609A/en not_active Expired - Lifetime

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