Know about type and strength of gear material | KHK

Stainless steel contains ≤ 1.2% carbon (C) and ≥10.5% chromium (Cr). SUS303 and SUS304 is austenitic stainless steel with excellent corrosion resistance, while SUS440C is martensitic stainless steel with high strength. (Table 5-8) SUS303 has better machinability than SUS304 because of a high sulfur (S) content.

Gear Materials and Heat Treatments | KHK

6-1 Types of Gear Materials S45C (Carbon Steel for Structural Machine Usage) S45C is one of the most commonly used steel, containing moderate amounts of carbon (0.45% ). S45C is easily obtainable and is used in the production of spur gears, helical gears, gear racks, bevel gears and worm gears. Heat Treatment and Hardness

hardness for spur gear made of 1045?? - Material …

RE: hardness for spur gear made of 1045?? Induction hardening the teeth to a surface hardness of 60 HRC, effective case depth (to 50 HRC) of ~ 1 mm, and core hardness of < 35 HRC would be typical. However, this is application dependent and not a perfect recipe for every gear. Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to ...

Rockwell Hardness Guide | What it is, How to Measure,

The Rockwell hardness scale gets its name from its inventors, Hugh M. Rockwell and Stanley P. Rockwell. The Rockwell brothers were metallurgists working in a Connecticut ball bearing factory back in the early 1900s. They recognized the need for accurately and quickly testing metal strength in bearing races. They also required a clear method for ...

Flywheel starter ring gear failures and hardness

From the side of heat treatment process; the main technical difficulty leading to hardness variation is the dimensions of the (470 mm) starter gear where no significant hardness variation (within ±1.5 HRC) is observed on small section size flywheel starter gears on metallurgical controls.In this case, maintaining the hardness within the specification and …

Miter Gears: Technical Information

Miter gears are a special class of bevel gears where the shafts intersect at 90° and the gear ratio is 1:1. KHK stock miter gears are available in two types, spiral and straight tooth, with high precision grade for demanding torques and …

Gear Hardness Technology

Gear Hardness Technology Michael: J.Brogne &. Danny IF.Smithl Dudlley Technicall Gro1up, San Diego. CA Introduction: In a very general sense, increasing the hardness of a steel gear increases the strength of the gear. However, for each process there is a limit to. its effectiveness. This article contains background information on each of the ...

Core hardness control of 8620 gear - Eng-Tips Forums

Current specification states a core hardness of 35-45 Rc. This small gear has a circular tooth thickness of nominally .06 inches. The current heat treat requirements are as follows, 1) Case hardness of 89-91 R15N with an effective case depth of .008-.014. 2) Core hardness to be 35-45 Rc.

Optimum Carburized and Hardened Case Depth - Gear …

Overheating gear teeth during operation or manufacturing (such as grind temper) can lower case hardness, alter residual stresses, and reduce resistance to subcase fatigue. In fact, grind temper is often the root cause of subcase fatigue failure. Table 2 gives guidelines for minimum effective case depth to avoid subcase fatigue.

Induction Gear Hardening | Gear Solutions Magazine Your …

Low-alloy and medium-carbon steels with 0.4 to 0.55% C (e.g., SAE 1040, 15B41, 4140, 4340, 4150, 1552) are commonly used in induction gear hardening. In some applications, high-carbon steels (SAE 5160, 1080, 52100) are used, as well as martensitic stainless steels, cast irons, powder metallurgy materials, and proprietary microalloy steels.

Gear Hardness Technology | Gear Technology Magazine

Gear Hardness Technology. March 1, 1992. In a very general sense, increasing the hardness of a steel gear increases the strength of the gear. However, for each process there is a limit to its effectiveness. This article contains background information on each of the processes covered. In each section what is desired and what is achievable is ...

Gear Hardness and Hardness Testing – Marples Gears

Cutting a gear hard isn't a challenge for traditional gear cutting processes, i.e. hobbing and shaping. Gear teeth can be cut into a component up to 45 HRc. If cutting a full hard gear tooth, carbide cutting tools either a hob or shaper will be used to ensure that the lead time is not extremely long due to cut time and tool replacement.

Through-Hardening Gears - ASM International

gears that do not require high surface hardness. Typical gear tooth hardness after through hardening ranges from 32 to 48 HRC. Most steels that are used for through-hardened gears have medium carbon (0.3–0.6%) and a relatively low alloy content (up to 3%). The purpose of alloy content is to increase hardenability. The higher the hardenability ...

Rockwell hardness test - tec-science

In the Rockwell hardness test, the measure of the hardness is not an indentation surface but an indentation depth. Either a carbide ball or a rounded diamond cone with a tip angle of 120° and a tip radius of 0.2 mm serves as the indenter. The indentation depth can be read directly from a dial gauge via the traverse path of the testing machine.

Ernst Hardness Testers

Bench hardness tester NR3D Benchtop Hardness Testers. STE/B Portable Hardness Testers. STE/A Portable Hardness Testers. Computest Lite Portable Hardness Testers. Via Monte Tagliaferro 6 - 21056 Induno Olona …

Case Hardness - an overview | ScienceDirect Topics

The required hardness profile and resulting gear strength and residual stress distribution are basically determined by the type of gear material (steel or cast iron), its prior microstructure and the desired gear performance characteristics. Gears made of cast irons (ductile, malleable, and gray), and low-alloy and medium-carbon steels with 0.4 ...

Hardness Testing Gears — Know Your Options for Best …

Designed for the accurate hardness testing of small precision parts, thin materials, case-hardened layers and all sorts of steel components, Micro Vickers hardness testers utilize weight loads of under 1 kg, while Macro Vickers hardness testers utilize larger weight loads of up to 50 kg. This type of test bridges the gap between the superficial ...

Tribological failure analysis of gear contacts of Exciter …

2. Background. In the current article, the problem related to failure (as shown in Fig. 2) of gear contacts in an Exciter Sieve of coal crushing mill has been analyzed.The gears used in this application are fabricated from EN 31 steel (C: 1%, Mn: 0.50%, Cr: 1.40%, Si: 0.20%) and have the surface hardness of 60–62 HRC.

Gear Teeth Hardness Tester - eTesters.com

Gear Teeth Hardness Tester. PHT-1740 - Phase II Plus. This dedicated unit is designed to test gear teeth and other difficult to access applications. The 1740 is an economically priced hardness tester that is loaded with the same features found on the base 1700 version. The 1740 hardness tester is capable of measuring the surface hardness of a ...

pinion to gear hardness ratio - Gear & Pulley engineering

pinion to gear hardness ratio. j8715 (Mechanical) (OP) 2 Oct 09 09:50. Hi. Currently I have a system from a vendor with a 1.25:1 ratio. The Gear is 84 Hrb and the pinion is around 42 Hrb (I can't really get to it to test it easily, I'm guessing from a material book). No surprise the pinion is failing very quickly.

Dissimilar material and/or hardness as a function of gear size

The specific effect of differences in material properties, specifically surface hardness, case depth, and microstructure are embedded in even the basic form of the Lewis equation. Two factors of interest are the Load Distribution Factor (K m and K H) and the Elastic Coefficient (C p and Z E). The Load Distribution Factor is a mathematical means ...

Evaluating and defining hardness, and the evolution of …

Eric Oberg in his 1914 book Heat Treatment of Steel defined hardness as the property resisting penetration. According to the stress that the metal is subjected to the hardness could be tensile, cutting, abrasion, and elastic. Dana defined mineralogical hardness as "The resistance offered by a smooth surface to abrasion."