FR2664839A1 - Device for holding components or tools on a honing (lapping) machine - Google Patents

Abstract

The invention relates to a device making it possible to hold tools by means of supports (1) on a planar honing machine. The device consists of a support (1) covering or immobilising the tools (2) against the turntable (5) of the honing machine.

Description

 The present invention relates to a device for holding workpieces or tools to be machined on lapping machines.

 Traditionally the tools are placed against the turntable of the lapping machine, in a ring called "satellite". A flexible plate is placed on the tools, then a rigid disc. Pressure is exerted on the disc to press the tools to be machined onto the machine table. The tools can also be separated by a spacer.

These processes provide
- variable pressure on the tools.

 - removal of uneven material.

 - chipped cutting edges.

 - incorrect parallelism.

 - the interlayer withstands the same pressure as the tools and wears out quickly.

 The device according to the invention overcomes these drawbacks. It includes independent tool supports in the same satellite.

According to particular embodiments,
- the support covers the tool and becomes integral with it; side to be visible.

 - each support is placed in the correct position in the satellite, on the side to be machined from the tool opposite the turntable. This support can be wedged in the satellite by an insert.

The accompanying drawings illustrate the invention
Figure 1 shows a bottom view of the device without the lapping machine tray.

 Figure 2 shows in section the device in function according to the invention.

 FIG. 3 represents a support covering the tool to be maintained; in this case it is a thin cutting tool.

 Figure 4 shows the section of a support covering the tool.

 FIG. 5 represents the section of a support with holding pins in this case it is a cutting tool pierced with holes for fixing.

 FIG. 6 represents the section of a spiked support with the tool held.

 Figure 7 shows the whole basic machine.

With reference to these drawings, the device comprises
- the machining tool (2) made of hard metal, tungsten carbide type, non-magnetic position, of small thickness. The periphery is cut to shape as needed, with a draft (4) to give the cut.

This cutting part is protected by a support (1) projecting from the tool.

The tools (2) may have one or more holes (8) for fixing. The tool to be machined (1) can also be fixed with adhesive, d3 glue, etc.

 - the support with pins (fig. 5 and fig. 6) is the simplest to execute; threaded holes (6) receive a shouldered screw (20) whose end which forms a pin (8) is the diameter of the hole of the tool (2). The part of the pin (8) projecting from the support (1) is slightly less than the thickness of the tool (2). The screws (20) can be replaced by fixed pins (8).

 - The styling support comprises a cavity (3) of a depth slightly less than the tool to be machined. This cavity (3) may include pins.

 - the supports (1) are independent of each other; they receive a pressure uniformly distributed over their surfaces and transmit it to the tools (2) in contact with the plate (5).

 - A satellite (11) rests on the turntable (5), it is held in place by rollers (12) positioned on a fixed support (13).

The satellite turns on itself, it supports and guides the whole.

 - the interlayer (14) comprises housings (7) receiving the supports (1). Housings (7) are cut outwards and have only three sides to facilitate the positioning of the supports (1). The fourth side is made by the inside diameter of the satellite (11). Spacers (9) are placed to release the interlayer (14) from the turntable (5), preventing it from slipping under the supports (1) and wearing it out.

 - the flexible plate (10) compensates for the differences in thickness (15), it can be replaced by flexible parts such as springs, elastic washers (16), etc. Tools of different thicknesses can be machined together in a same satellite (11); it suffices to adapt the dimension (19) of the supports (1) to obtain the total height: support plus tools (15).

 - The rigid and flat disc (17) is placed on the flexible plate (10).

It is pressed by weights (18) or by other loads.

 It is understood that the present invention is not limited to the embodiment described and presented which constitutes only an example. Numerous madifications can be made without departing from the present invention.

Claims (5)

 1) Device for holding parts or tools to be machined on plane lapping machines characterized in that includes supports (1) of independent tools (2). The supports (1) are held by an insert (14) comprising housings or recesses (7). They are put under pressure on the plate (5) by means of a flexible plate (10).  2) Device according to claim 1 characterized in that the supports (1) with pins (fig. 5 and fig. 6) have threaded holes (6) receiving a shouldered screw (20) whose end forms the pin (8 ) corresponding to the diameter of the hole of the tool to be machined (2) or to the setting of the tool (2).  3) Device according to claim 1 or 2 characterized in that a cavity (3) covers the tool (1) leaving outward that the part to be machined.  4) Device according to claim 1 characterized in that an insert (14) has spacers (9). They isolate it from the turntable (5).  5) Device according to claim 1 characterized by a flexible plate (10), it may be replaced by flexible parts (16) allowing the machining of parts of different thicknesses.