RU1782202C - Method for production of piston of internal combustion engines - Google Patents

Abstract

Usage: the field of automotive technology, in particular the manufacture of split elastic piston rings of internal combustion engines. SUMMARY OF THE INVENTION: the method consists in installing a larger diameter piston ring in a marking sleeve, the inner diameter of which is larger than the required size of the piston ring by one third of the increase of the inserted ring, where the increase is the difference between the diameters of the inserted and the required ring. The ends of the ring in the sleeve are shifted together, i.e. overlap, note the excess on one side, after which the excess removed from the sleeve of the piston ring is removed, then the ring is inserted into the marking sleeve and the clearance in the lock is controlled, it is based on the mandrel, it is clamped at the ends, then the sleeve is removed and produced the last operation is processed at the outer surface of the ring in the required size. 3 ill.

Description

The invention relates to the field of automotive technology, and more specifically, to a method for manufacturing split elastic piston rings D B C, and in particular to a method for producing such rings of the required size.

Similar methods are known, for example, a method for manufacturing piston rings, which consists in obtaining an annular blank, pretreating all surfaces of the ring, forming a copy processing and cutting a lock, in which the cutting of the lock is carried out prior to the forming processing with the rings based on the lock, and in addition, the ring blank is obtained cutting in a spiral.

The disadvantage of this method is the complexity of the forming copy-processing based on the lock, because this requires special equipment; spiral cutting of rings is also difficult. Therefore this

the method is applicable in industry and unsuitable for the individual manufacture of piston rings - if it was not possible to purchase factory-made ones.

There is also a method for producing the necessary rings in the absence of factory-made piston rings, for example, by turning fine-grained cast iron from a thick thick-walled pipe in one installation, followed by a hacksaw blade 0.5-0.8 mm thick and further routing to a value of 12 at the joint -15 mm and the necessary heat treatment.

The disadvantage of this method is the difficulty in individual conditions, the manufacture of the necessary castings-billets, from special cast iron, the complexity of wiring and heat treatment, as well as insufficient

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the rigidity and mechanical strength of the rings obtained in this way.

There is also known a method of manufacturing the necessary piston rings in the absence of factory rings, which most closely coincides in technical essence with the claimed (prototype), which is the manufacture of casting-billets made of cast iron, tapping with a stock allowance

cutting out slices from it, crimping the rings,

Pressing it at the ends of the mandrel. Turn the outer turn a little and then, in the special procedure of the 1 inner surface, to the required

sizes.

The disadvantage of this method is the difficulty in obtaining the required alloy and casting the billet for the ring under individual conditions. The laboriousness of manufacturing the necessary equipment and the ring itself is high. As well as the low operational properties of the finished ring, in connection with which there is a danger of its breakdown in the engine.

It is also known (prototype) that in the absence of appropriate rings of factory production, rings of several large diameters are used if the increase in diameter does not exceed 1.0-1.5 mm. In this case, the circumference of the ring is reduced somewhat more than 3-4.5 mm, i.e. cut off the excess.

The disadvantage of this method is that such a ring takes the form of an ellipse, i.e. lays down in the cylinder with distortion, does not work for a long time, spoils the cylinder, overheats, and when prigret it has a large gap in the lock. The application of this method is not possible on modern heavy-duty engines.

The purpose of the invention is to improve the quality of manufacture as well as the recycling of worn rings.

Achieving the goal is possible due to the manufacture of the required rings from factory-made rings (high alloyed), which provides them with high performance properties.

Due to the final processing of the outer surface in the required size, which ensures good running-in and work in the engine.

The use of prefabricated rings ensures the simplicity of their refinement and the possibility of the secondary operation of worn (removed) rings.

The essence of the invention lies in the fact that it is guided by the table of sizes of the piston rings operated in various internal combustion engines and their repair magnifications, and, based on the fact that the equipment is operated

for many years, and the rings change frequently and there are many used ones, then when there are no rings of the right size, you can pick up new or worn ones, but close in size, i.e. having an increase in diameter by 1-2 mm. The most important element of the ring is the gap in the lock, since when the diameter of the ring is worn, for example by 0.2 mm (i.e., only 0.1 mm per side), the gap value

the lock will already be 0.628 mm (since approx. 0 tg), cylinder wear, for example by 0.03 mm, will add a further gap of almost 0.1 mm in the lock. In sum, this is already sensitive for modern ICEs with a high degree of

compression, and such rings often change, although physically they can still work, i.e. worn rings can be used again, but in cylinders with slightly smaller diameters, which ensures

them a second life. For this, the outer surface of the ring at closed ends should be machined to the size of the cylinder (i.e., to the required size). But at the same time, the ring should not significantly change its parameters, its cross-section should provide sufficient elasticity, strength and wear resistance. The claimed technical solution differs from the prototype in that an annular billet enlarged by 1-2 mm in diameter is inserted with twisting into a marking sleeve, the inner diameter of which is calculated by the formula

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20 „+ D3

where DH is the nominal diameter of the piston ring;

D3 - diameter of the workpiece ring.

The ends of the inserted billet ring overlap and cross out the excess on one side, removing the billet ring from the sleeve reduces its circumference (cutting off the excess). Then again

set the workpiece ring in the marking sleeve and control the thermal gap in the lock (if necessary, saw the ends), setting the ends to the joint. Then, without removing the workpiece ring from the sleeve, base it on the inner diameter of the mandrel and clamp it at the ends, then remove the marking sleeve, it remains to process the outer surface of the workpiece ring in the nominal (required) size,

the ring is ready.

In FIG. Figure 1 shows a section of a marking sleeve with a workpiece ring placed in it, the ends of which are overlapped, and also a side view showing the mark

excess (causing risks) on the workpiece ring; in FIG. 2 - control probe, thermal clearance in the lock of the workpiece ring installed in the marking sleeve (the ends of the workpiece ring are butt); in FIG. 3 - basing of the workpiece ring on the mandrel using a marking sleeve.

Example. After overhaul, the VAZ 2101 engine needs piston rings with a diameter of 76.4 mm, which they could not be purchased, but there are worn (removed from the engine) rings from a Ural motorcycle whose diameter (with new ones) is 78 mm. The magnification is on the order of 1.5 mm. To use the existing rings, the marking sleeve 1 is machined with an inner diameter of 2PH + Pz 2 -76.4 + 78 230.8 DBHz33

76.9 mm

insert the blank ring 2 into it, align the ends of the blank ring with the overlap and mark the excess (put at risk) (Fig. 1), remove the excess (by cutting strictly at risk), insert the blank ring 2 B marking sleeve 1 ( by setting the ends of the ring all the way) and control over the probe 3 the thermal gap required on the nominal piston ring (Fig. 2). Then, having measured the minimum diameter of the inner surface of the billet ring 2 located in the marking sleeve 1, a mandrel 3 is machined with a seating strip in a set size and a washer 4 for clamping at the ends. The workpiece ring 2 is based on the mandrel 3, not removed from the marking sleeve 1, the washer 4 clamps the workpiece ring 2 at the ends with the washer 4, the marking sleeve 1 is removed, placing it on the rotating center 5. After that, the cutter 6 is made external processing of the workpiece ring 2 into the required (nominal) size 76.4 mm. The ring is ready, it has the necessary thermal clearance in the lock and the nominal diameter size is 76.4 mm (Fig. 3).

The proposed method allows, in cases where there are no necessary piston rings,

for example, restorers, owners of foreign cars, if there is a shortage, make the necessary piston rings in individual conditions, using worn (removed) rings of a slightly larger size from other equipment. Since the ring is made from a proprietary one, its physical and mechanical properties are not inferior to the new piston ring, and, accordingly, the outer diameter of the cylinder diameter ensures good running-in and durability. Recycling worn piston rings, in addition, will be beneficial to auto farms, enterprises, etc.

Claims (1)

SUMMARY OF THE INVENTION Method for manufacturing piston rings internal combustion engines, in which the circumferential and piston rings of the workpiece are reduced in diameter with a diameter greater than the nominal, radially compress it to reduce the ends of the ring, base it on the inner diameter of the mandrel and clamped at the ends with subsequent processing of the outer surface to the required size, characterized in that, in order to improve the quality of manufacture, as well as reuse of worn rings, reducing the circumference of the piston ring-billet with a diameter greater than nominal, is carried out after its installation in the marking sleeve with inner diameter D8H (2 DH + Oz) / 3, where DH is the nominal diameter of the piston ring; D3 - diameter of the workpiece ring, at the same time, the ends of the billet ring are overlapped and the excess is marked on one side, and after reducing the circumference of the billet ring, install the ring in the marking sleeve and control the gap in the lock, then base the ring on the mandrel. Editor V. Trubchenko Compiled by S. Potapov Tehred M. Morgenthal Buff a # & g. Z Corrector. S. Lisina