Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1985-10-18
1988-06-28
Whitehead, Harold D.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
51313, B24B 3102
Patent
active
047530464
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process for treatment by bulk agitation of rough castings or machined parts, wherein these parts are agitated, and possibly mixed with abrasive materials and/or cleaning products in a treatment chamber of a vat in the form of a rotary drum rotating about a horizontal axis.
The invention further relates to a machine for carrying out this process, comprising a vat in the form of a rotary drum rotating about a horizontal axis, a permanently open, axial charging opening, a mechanism for driving said vat, means for controlling said drive mechanism, means for charging parts to be treated into at at least one treatment chamber of the vat, and means for receiving the parts and wastes after treatment.
The treatment of rough castings or machined parts, by agitation in a rotary vat is known and currently applied to more particularly effect clipping and snagging of castings of metal or synthetic material, or else deburring, degreasing and polishing of metallic machined parts obtained by stamping for example. The treatment may be completed by injecting into the vat treating agents for degreasing or washing the parts, then drying the parts. It is further known to effect treatments of this type which are combined with a cryogenic treatment, more particularly by injecting liquid nitrogen, to harden and render certain parts brittle, for example when clipping castings of synthetic material or when deburring elements comprising elastomers.
Most machines utilized for these treatments comprise a vat with a horizontal axis, which presents at least one lateral opening equipped with a door for charging and/or discharging the parts. The presence of a door at the vat periphery nevertheless entails a series of constructive or functional drawbacks. The door represents in particular an important complication with regard to the manufacture of the vat. It comprises locking elements which must be actuated by hand or be specially designed for automatic mechanical actuation, controlled by an adequate device. In the case of cryogenic treatment, thermal insulation of the vat is complicated by the presence of the door and its locking means. On the other hand, halting the vat for charging and discharging must be obtained in given positions, which requires manual or automatic control of the stopping position. In addition, the stationary periods of the vat for charging, discharging, and operating the door have unfavourable repercussions on the productivity.
To meet these drawbacks, machines have been realized with a vat provided with an axial opening, to allow charging and discharging of the parts while the vat rotates, discharge being ensured by a baffle of helical or spiral form which brings the parts to a doorless evacuating opening, when the direction of rotation of the vat is reversed.
French patent FR-A-No. 2,192,478 describes a machine of this type, equipped with a vat with a horizontal axis, comprising a treatment chamber with a peripheral wall which is conical, an axial cylindrical conduit, which is concentric with this treatment chamber and is provided with an integral helical baffle extending up to an axial evacuating opening, and a conduit of spiral form connecting one end of the axial conduit to an opening of the treatment chamber. This opening is located at the periphery of a front wall of the conical treatment chamber, where this chamber presents the largest diameter, so that the parts and the liquid enclosed in the chamber are permanently brought by gravity close to this opening. When the vat rotates in a first direction, the parts are introduced into the axial opening, in which they are axially carried along by the helical baffle towards the spiral conduit, then arrive at the treatment chamber, where they are treated more particularly by agitation and washing. When the direction of rotation of the vat is reversed, the parts and the liquid are evacuated radially by the spiral conduit, then axially by the helical baffle of the axial conduit.
However, the process carried out in this machine presen
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