SU1399005A2 - Self-aligning clamping chuck - Google Patents

Abstract

The invention relates to a machine tool industry, and specifically to devices for securing blanks. The purpose of the invention is to improve the reliability of the clamp. A sleeve 2 is inserted into the housing 1, which serves as a cylinder for the piston 3. In the grooves of the sleeve 2, inserts 4 are installed with end wedge surfaces that interact with wedge elements 5 and 6. The tilt angles of the wedge surfaces of the inserts and elements 5 and 6 are equal. The sponge 8 is mounted on the stem 7. When clamping, the fluid is supplied under pressure into the cavity A. The sponge 8 rests on the part. Then the fluid is fed into the cavity B. The wedge element 5 moves to the left, and the inserts 4 and the elements 5 and 6 are jammed between them, and therefore, the stem 7 and the sponge 8 are fixed. After that, the pressure in the cavities A and B decreases. Upon expansion, fluid is supplied to cavity B, element 5 is supplied to the right and wedge elements 5,6 and inserts 4 are wedged, i.e. the stem 7 and the jaw 8 are unfixed. Then pressure is supplied to the cavity G and the part is unclamped. 3 il. yu cl w w w w w w w w w w w

Description

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The invention relates to a machine tool industry, and specifically to devices for securing blanks, and is in addition to the main author. St. No. 125529A,

The purpose of the invention is noBbmeiuie clamping reliability,

In figure 1, the Io-Alp cartridge, end view; on fit, 2 — section A-L in FIG. 1; on rtiHi 3 - section B - B on figo 2,

Clamping chuck; from the housing 1. in which the sleeve 2 is mounted, serves as a cylinder for the piston 3, in the grooves of which with the possibility of radial displacement 1 and evenly around the circumference of the insert. Inserts A is spaced. between KG; ipovymi elements 5 and b "And e: hemopt

5c, the inner wedge surface fits in the first section 1 with the possibility of axial movement and serves as a base for unlocking, and the wedge element

6c 1 with the outer klip surface fixed on the rod 7. The slope angles of the end surfaces of the inserts 4 and the wedge elements 5 and 6 are made smaller than the friction angle to ensure the condition of the sysyo mmp. The sponge 8 is fixed on the rod 7,

Chuck works as follows.

When the product is driven, the pressurized fluid enters cavity A, the piston 3 with the rod 7 and the wedge element 6 is moved in the axial direction until then. while the sponge 8 touches the machining: the first one, and the parts, after which the fluid under pressure is fed into the cavity R by moving the wedge element 5 in the direction of the clamp. Moving, the wedge element 5 with its inner clasp surface acts on the associated wedge of the inserts of the inserts A. The last wedge surface affects the surface of the wedge 6 that mates with it, the wedge 7 of the wedge 7 with the sponge 8 fixed on it, the workpiece finally clamped with the necessary effort. Then the fluid pressure in cavities A and B decreases, the part is machined.

At the end of the machining of the Sh1d part, the bone enters the cavity B under pressure, while the element 5 is mixed, the inserts are released

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five

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five

0

five

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five

D value V /

0 5

4 and the sponge 8 with the sponge 8 is wedged, the clamping force of the product drops. The cavity B is at this moment connected to the drain. The fluid is then supplied to cavity D; since the inserts are unfixed. the piston 3 with the rod 7 and the element 6 is freely moving, the cavity B is connected with the drain, the sponge 8 moves away from the workpiece and unclamps it.

Consider the condition when in the process of work on the sponge acted vzmuga, and usi.aie Q (cavity A and B are unloaded). This force is transmitted through the wedge element 6 to the inserts.

S 1

2 tgloC +)

where c (is the slip angle; cf is the friction angle. The losses of 1 gairaplichnyh sleeves 2 by prebrebgschom. The same force W, which operates in the radial direction t, e, perpendicular to the direction of the helix. Q, inserts 4 affect The biped-up surface of the clipping element 5, causing an arcing that acts on the element 5, which is directed parallel from the stem and stsm to unlock the elements

5and B.Rrsdsf W tqw. STOVI to the strength of the preps Tpcinin force on the outside

and the inner surfaces of the clip element 5, Sil; friction is equal to F .p 2 V tgif. To fulfill the self-braking condition, it is necessary to comply with the condition Pp, c. or W-tg: i 2V / tgtfc Substituted the value of W, we get

Qtq tgcf

G liic / r y q

 f 2 i-p.

Therefore, if the condition C1 condition is met, the self-braking condition is fulfilled, which does not depend on the Q (disturbing force) value. During the clamping process, fluid can be fed into the cavity B under pressure, ensuring only the contact of the wedge element 5 with the inserts 4, increasing The force applied by the wedge element 5 to the inserts 4 does not affect the increase in the reliability of the clamping and can be calculated.

The presence of inserts located between the wedge rings in the grooves

1

Bb

Editor A.Dolinich

Compiled by A. Gavryushin Tehred M. Khodanych

Fa.H.

Corrector MoPojo

Claims (1)

SUMMARY OF THE INVENTION No. 1255294, characterized in that, in order to increase the clamping reliability, the cartridge is provided with inserts arranged uniformly around the circumference between the wedge elements, at the ends of which wedge surfaces are made, and the inclination angles of the wedge surfaces of the inserts are equal to the inclination angles of the wedge surfaces of the wedge elements. B ~ B Fig. Z