SU1038208A1 - Apparatus for basing and ecuring fragile parts - Google Patents

Abstract

A DEVICE FOR BASING AND FIXING THE FRAGILE DETAILS OF A COMPLEX FORM {LMA when face-grinding, containing an elastic band and restrictive rollers, characterized in that, in order to improve the accuracy of the base, it is equipped. an additional shaped roller installed between the limiting rollers. with the possibility of contact with the elastic band and moving towards the cutting zone.

Description

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The invention relates to devices for loading, fixing and positioning parts during face grinding, in particular when processing ferrite U-shaped cores with a diamond tool when the machine is operating in automatic mode.

A device for positioning and fastening parts is known, comprising an elastic band pressed against the parts to be machined and a sleeve-roller chain in contact with the elastic band and cooperating with the spring-loaded lever 1.

The disadvantages of the known device are the impossibility of the basement and processing of fragile parts of complex forgly, since the part being processed (rotary and translational) in its movement contacts the fixed support surfaces (spalling), significant wear of the base rubbing surfaces and a large belt tension (and caused by the use of the roller chain),

The purpose of the invention is to improve the accuracy of the basing of parts.

The goal is achieved by the fact that the device for positioning and fixing fragile parts of complex shape during face grinding contains:; 1pacial tape and restricting rollers, equipped with an additional shaped roller installed between the restrictive rollers 1/1 and with the possibility of contact with an elastic tape and moving towards the cutting zone

iia FIG. 1 shows the dell-based arrangement and attachment of fragile parts, a general view; in fig. 2 - view | along arrow L in FIG. 1; in fig. 3 section bb in fig. 2; in fig. 4 U-shaped ferrite core to be machined over surface L with holding drawing dimension h (base surfaces for fastening when machining B and C); in fig. 5 fixing and base element (installation slot) on boot disk I (K and L base surfaces)

The device contains a vibrating hopper 1 and a loading disk 2 with mounting slots 3. The loading disk has a drive for providing an adjustable feed rate (not shown). In the slots 3 of the disc 2, the machined parts and 4 are pressed by the endless elastic band 5, which is able to move along the guide rollers 6 by tensioning its spring-loaded roller 7 to the grinding wheel 8. Restrictive 9 and 10 and basing shaped 11 rollers are installed in the machining zone .

The device works in the following way.

The workpieces 4 from the vibrating hopper 1 are fed to the mounting slots 3 of the 3arpj3O4Horo disk 2, which is driven to provide an adjustable feed rate. In the slots 3 of the disc 2, the parts 4 are clamped by an endless elastic section 5, which is driven by the guide rollers 6 by friction with the surface of the loading disc 2 by tensioning it with the spring-loaded roller 7, and goes into the treatment area to the L-dial 8. 8. The working zone has 9 and 10 restrictive and 11 shaped basing rollers which change the trajectories of movement of the elastic belt 5 in the grinding zone due to which the workpieces are displaced to the grinding wheel 8 and the base end K (Fig. 5) of the installation slot 3 of the boot disk 2, which guarantees grinding of parts to a predetermined size h (Fig. 4). The positioning shaped roller 11 is installed with the possibility of adjustment movements in the direction of the grinding wheel 8 and in the direction of the axis of the boot disk 2, as shown in FIG. 3, Roller 11, acting on the elastic band 5, transmits a force P a fixed piece, the component of which displaces the piece to the base surface K of the loading disk 2, and the force P presses the part to the loading disk 2 (surface L). The force Pj arises from the tracks of the elastic tape against the surface of the part and must exceed the force of the friction of the part against the surface of the nest 3 of the loading disk 2 (friction of the ferrite over steel), i.e. XIII e P) / j, normal grinding force., And K and K2, respectively, the friction coefficients of a ferrite part with an elastic tape and the base surface of the boot disk slot.

Another prerequisite for the accuracy and stability of the base of the part at the time of processing is the amount of displacement (dozhaty) of the parts towards the grinding wheel, i.e. (/ (S, where (/ is the amount of displacement (curvature) of the elastic belt to the grinding wheel, S is the error of installation of the workpiece in the slots of the boot disk, which is caused by the stability of the boot device.

The input limiting roller 9 is set relative to the clamping roller 11 by an amount a (Fig. 2) which is chosen equal to the grinding path (the length of the contact of the workpiece with the grinding wheel), which makes it possible to evenly distribute the removal of the allowance.

The output restriction roller 10 allows the elastic tape 5 to return to its original position, and its installation distance relative to the roller 11 is selected structurally. Taking into account the low speed of the elastic belt 5 (the feed rate of parts during grinding), based on 11 and restrictive 9 to 10 rollers can be replaced by fixed stops -: with the possibility of adjustment movements.

The proposed device allows to increase the accuracy of the base of parts, in particular, U-shaped ferrite cores, to reduce the number of chips by 15-20%.

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Claims (1)

DEVICE FOR BASING AND FASTENING FRAGILE DETAILS OF COMPLEX COMPOSITION> for face grinding, containing elastic tape and restrictive rollers, characterized in that, in order to increase the accuracy of basing, it is equipped with an additional shaped roller installed between the limit rollers with the possibility of contact with elastic tape and moving towards the eon of cutting.