SU904909A1 - Device for basing and fixing pistons at working - Google Patents

Description

(54) DEVICE FOR BASING AND MOUNTING PISTON WHEN TREATING

one

The invention relates to mechanical engineering, namely, devices for securing parts during machining of their external surfaces.

A device for positioning and fixing the pistons during processing is known, comprising a housing, a stem with a tapered spring-loaded bushing, a drive, centering, plunger, ejectors, clamping and base elements 1.

A disadvantage of the known device is that the basing in the axial direction is carried out along the inner untreated bottom surface of the piston head, which does not provide sufficient accuracy of dimensions from the axis of the holes for the piston pin to the ends of the pistons.

The aim of the invention is to improve the accuracy of the base of the piston relative to the axis of the hole under the piston pin.

The goal is achieved by the fact that profiled grooves are made in the rod, and the basing elements are made in the form of plungers with keys, which enter the hole for the piston pin, and each square plunger has a through-slot groove.

the grooves are crosswise relative to each other, and the drive is designed as a single-acting hydraulic cylinder with an additional drain channel.

FIG. 1 schematically shows the proposed device, the cut; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one; in fig. 4 — node I in FIG. 2 in FIG. 5 - drive the device.

The device consists of a housing 1 (Fig. 1 and 2), which is attached to the flange of a hollow

10 machine spindles (not shown) on the ring bore with the help of bolts (not shown), rod 2, working spring 3, which ensures the clamping of the product 4.

15

A cone bushing 5 is mounted on the rod 2 with a key b fixed on it, which is inserted into the keyway on the rod 2, a spring 7, the tension of which is adjusted by nuts 8. In the case 1, three or more radial plungers are perpendicular to the axis of the Pat2Qron 9 with return spring. 10, in contact with the stops 11, which are located plunger 12 and 13 with lead-in chamfers 14 and 15, the splines 16 and 17 installed in them; pushers 18 s

springs 19, which are adjusted by screws 20.

At the end of the rod 2, made in the form of a cylindrical support, a clamping rocker arm 21 is mounted, held by the flat spring 22.

In the plungers 12 and 13 are movable fingers 23, compressed by the spring 24 (Fig. 3). The keys 16 and 17 of the plungers 12 and 13, respectively, are in contact with the side surfaces of the profile grooves 25 and 26, formed on the flat sides of the rod 2.

The grooves 25 and 26 on the rod 2 are located crosswise and their profile has zones a, b, c, d corresponding to sections of the operation cycle of the device (Fig. 4).

With the axial movement of the rod 2, the position of the pins 16 and 17 in the joint and corresponds to the operating state of the device in which the product 4 is fixed; in the zone in - the state of the device during the period of orientation and fixing of the product 4. The width of the grooves 25 and 26 in zones a and b is equal to the diameter of the pins 16 and 17. The position of the keys 16 and 17 in zone c corresponds to the initial state of the device before installing the product.

The width of the groove in the area with more than the diameter of the pins 16 and 17 by an amount equal to the sum of the gap between the housing m 1 and the bosses of the product 4 and the size of the lead chamfer 14 or 15 of the plungers 12 and 13.

The position of the pins 16 and 17 in zone d corresponds to the removal of article 4 from the device after processing.

The width of the groove in the zone d is equal to the diameter of the keys 16 and 17.

A threaded rod 27 is attached to the threaded end of the rod 2, which serves to adjust the clamping force of the spring 3 and connect the rod 2 through the bearing 28 to the rod 29 of the piston 30 installed in the hydraulic cylinder 31 of the operating cycle control device.

The hydraulic cylinder 31 has a fluid supply passage 32 and a fluid drain passage 33.

The distance between the channels should be equal to the distance between the centers of zones a and from slots 25 and 26 on rod 2, and the stroke of piston 30 in hydraulic cylinder 31 should be greater than the distance between extreme sections of zones 8 and from slots 25 and 26 (in - f with). The device works as follows.

In the initial position, when the keys 16 and 17 are in, the zone with the slots 25 and 26, and the piston 30 of the hydraulic cylinder 31 closes the channel 33, the channel 32 is closed, the product is installed on the device.

Since the width of p; 13s in this zone allows the 16 and 17 hacks to be perpendicular to the axis of the grooves, the product (piston) with its bosses of the holes for the piston pin pushes the plunger 12 and 13 inside the housing 1, mix your fingers 23 and szhima

spring 24, as well as moving inside the housing 1 ejector 18, compressing the spring 19.

The product slides onto the cartridge until it is fixed by the plungers 12 and 13, which

enter the holes under the piston pin under the action of the movable fingers 23 and the compressed springs 24.

Then the channel 32 of the hydraulic cylinder 31 is opened to drain the liquid. Under the action of the spring 3, the rod 2 is stirred, the liquid is displaced from the hydraulic cylinder 31 into the channel 32, in the profile grooves 25 and 26 the keys 16 and 17 slide in succession in the dummy zones, the plunger 12 and 13 slide into the hole under the piston

product finger 4.

Upon further movement of the rod in the area a the cone sleeve 5, preloaded by the spring 7 through the centering plunger 9, centers the product 4 relative to the axis of the device, compressing the return springs 10, and then the swing arm 21 abuts the raw internal surface of the product and attracts it to the extended plungers 12 and 13. In this way, basing and securing the product 4 is ensured. To remove the product after processing, the hydraulic cylinder 31 with the channel 33 closed, through the channel 32 is supplied under pressure m. The fluid that moves the piston 30 and Respectively, pin 2, compressing spring 3

in the opposite direction to such a position when the pins 16 and 17 do not fall into the zone d of the slots 25 and 26 and the plunger 12 and 13 completely enter into the body I.

In this position, the pushers 18 move the piston to be removed from the device.

The product is removed.

Then the channel 32 is closed, the channel 33 is opened to drain the liquid, the piston 30 moves until a full

overlap the additional channel 33 with a pulley. The keys 16 and 17 occupy a middle position in the zone from the slots 25 and 26 of the rod 2, corresponding to the initial position of the device before installing the product.

This design improves accuracy.

base the piston relative to the axis of the hole under the piston pin.

Claims (3)

1. A device for positioning and fixing the pistons during processing, comprising a housing, a rod with a tapered spring-loaded bushing, a drive, centering plunger, ejectors, clamping and clamping elements, characterized in that, in order to improve the accuracy of the base of the piston relative to the axis of the hole under the piston pin, profiled in stock the grooves, and the clamping elements are made in the form of plungers with pins entering the hole under the piston pin, with each slot having a through slot of a rectangular shape. 2. A device according to claim 1, characterized in that the shaped grooves are arranged crosswise with respect to each other. f 6 I ff II / o Yu-13 1XX 7 G V Vk hh /. i S 20 Y 1 fe 2 3. A device according to claim 1, characterized in that the drive is made in the form of a single-acting hydraulic cylinder with an additional drain channel. Sources of information taken into account in the examination 1. US patent No. 2.555.170, cl. 279-2, pub. 1951. / iA / 3 f8. - / 22 15 25