DE744240C - Use of copper-zinc alloys for mechanically and slidingly stressed machine parts - Google Patents

Description

Use of copper-zinc alloys for mechanical and sliding "claimed machine parts The invention relates to copper-zinc alloys, especially for - & e production of bearing organs, such as slide bearings, slide rails, Guide bushes, spindle nuts, stuffing boxes, worm gears, toothed gears, bevel gears, etc. Like. Ring gears, or in general of machine parts, are useful that have a sliding or perform a rolling movement and experience pressure or shock loads.

For the production of storage organs are known to be tu. a .. various Types of brass and bronzes have been used. However, these machine parts are multiple too heavy. It is therefore endeavored to make them from specific, lighter materials to manufacture. This requirement exists especially for the equipment of aircraft and "also for motorized land vehicles. The mapped out way to solve the Task the inventor uses for. Part; but it also goes beyond that: still from based on the idea that weight loss can also be achieved if the mechanical properties, such as, in particular, yield point, strength and hardness; be increased so that a reduction in cross-sections is permissible.

When performing the solution to such a task, however, occurs Difficulty to ensure that despite high hardness, a proportionate good run-in ability and emergency running, especially with the machine parts with sliding stress. In addition, both the latter as well as machine elements that have a rolling hzw. rolling Bleapprue ung experienced, the wear and tear should be kept as small as possible in order to avoid frequent wear Avoid replacing, for example, the gear rims. After more difficult it is in this Case to meet these requirements when still others, e.g. B. dynamic forces such as; Impact loads, darrt joins and the operating temperature also rises above i2o to 2oo ° C. Such phenomena occur, for example, on aircraft and military equipment parts. What is essential is sideways, that the elastic numbers, such as elastic limit; and yield point, very increased so that there are no permanent deformations even with static and dynamic loads occur, which increase the local specific bearing pressure.

It has now been found that the to such machine parts in the Requirements made in practice can be met, no alloy is used is composed of 56 to 6o% 'copper with an addition of aluminum and' hang-on from i o to rust zinc, the ratio of manganese to aluminum being expedient Is 2: 1.

So z. B., an alloy in front 58% copper, 8ofo manganese, q% aluminum, The remainder of zinc as mold casting has the following values: Yield strength 51.9 kg / mm2, strength 76.1 kg / mm2, elongation 8 0! O.

In the pressed state, e.g. B. in the form of rods result in a Diameter of 2omm the following values: Yield strength 57.2 to 6q., 2 kg / mm2, strength 83.5 to 87.6 kg / mm2, elongation 16.6 to 17%, Brinell hardness 193 to 205 kg / mm2, notch toughness 2.8 The high yield strength of these alloys is particularly noticeable.

An advantage of such materials is that even with stronger Cross-sections have high strength values without any additional measures, such as Curing, cold stretching, etc., can be achieved, which is economically and technically a, means great progress. In the case of pressed bars, for example, they were 100 m in diameter The following figures determine the yield strength 55.8 to 59.8 kg / mm2, strength 78.5 to 8q., OkgJ'mm = ', elongation 12 to i 5%, Brinell hardness 211 kg / mm2.

Up to now, such high values could only be achieved by adding foreign materials, like nickel, achieved «= grounding or by having the copper content much higher is chosen than in the case of the aforementioned alloys. In many cases it was there: also still necessary, a special heat treatment and cold kneading treatment (cold rolling, drawing) to be provided. Indern now saved on metals subject to foreign exchange and the application of the listed treatment methods is avoided, it is possible to choose the the alloys mentioned above, only by pressing, which in practice often to be solved as an urgently recognized task and - while maintaining very high mechanical Features various pieces of equipment of machines specifically lighter than to be designed up to now or to have higher demands.

Claims (2)

PATENT CLAIMS: 75 i. Use of high-strength copper-zinc alloys, from. 56 to 60% copper, 10 to 14% manganese and aluminum, the remainder zinc, consist, for machine parts. which in addition to a high, mechanical, g0 at the same time a sliding and are subjected to rolling stress or both at the same time. 2. Use of alloys according to claim i, wherein the ratio of- 85 manganese: aluminum is 2: i, for i in the Ansprtuch oenamnten purpose. In order to distinguish the subject of the application from the state of the art, the following publications were taken into account in the granting procedure: German patents .... No._3q.3 739, 686, 324 717770.