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Gear Rolling Dies
Thread Rolling Machines

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Comtorgage Corporation
Comtorgage Corporation manufactures a variety of hand-held, indicating gages (analog or digital) designed and built to measure various characteristics of machined, molded, forged, and pressed parts. Comtorgages are intended for use on the shop floor, or in the lab, wherever there is a requirement for frequent, and accurate monitoring of specific dimensions, with or without data collection.

FZG
The Gear Research Centre (FZG) is an integral part of the Faculty of Mechanical Engineering at Technische Universität München in Germany. Founded in 1951 by Prof. Dr.-Ing. E.h. Gustav Niemann, FZG now occupies a leading position in research, development and standardisation as the international competence centre for issues concerning mechanical drive technology. Since 2011 the institute is being led by Prof. Dr.-Ing. K. Stahl, following his precedessor Prof. Dr.-Ing. B.-R. Höhn.

Involute Simulation Softwares Inc.
Involute Simulation Softwares specializes in the development of gear calculation and manufacturing software. The main product, HyGEARS™ V 4.0, offers gear designers and manufacturers a standalone software package providing all the design, analysis and manufacturing tools needed from idea to production.

Machine Tool Builders
MTB recontrols existing CNC machines and rebuilds manual change gear machines, such as gear shapers, hobbers, and grinders into precision machines by converting mechanical components to motorized servos with multiple axes and spindles using CNC controls. Specializing in Fellows, Fromag-Rapida, Hoglund, Kapp, Liebherr, Lorenz, Module, Pfauter, and Red Ring brands.

McInnes Rolled Rings
McInnes Rolled Rings manufactures seamless rolled ring forgings from 4" - 144" OD. Offering quick quotes and fast, reliable deliveries. ISO9001 & AS9100 Certified.

Mitsubishi Heavy Industries America
Our family of gear cutting machines shares a name and a whole lot more. Mitsubishi gear hobbers, shapers, shavers and grinders also share Mitsubishi machine construction and Mitsubishi software and have common controls. That is why only Mitsubishi gear machines--the most complete family of gear machines--can deliver the fastest CNC learning curves and the highest quality gears.

Star Cutter Co.
Headquartered in Farmington Hills, MI, StarCut Sales, Inc. is a wholly owned subsidiary of Star Cutter Company and is a partner in the Star SU LLC enterprise for marketing, sales, and service. Through Star SU and StarCut Sales, Inc.'s international organization Star Cutter Company markets and services its products in North America, South America, Europe and the Far East.

American Gear Tools
Parker Industries Inc.
Roto-Flo / U.S. Gear Tools
U.S. Gear Tools

Related Power Transmission Categories

Spline Rolling Services

Related Power Transmission Companies

B & R Machine and Gear Corp.
B & R Machine and Gear Corporation is a family owned and operated gear manufacturer since 1974. We are a custom gear facility, manufacturing gears to customer supplied blueprint specifications and/or samples.

NSK Corporation
NSK is a global manufacturer of bearings and other motion & control products. It operates 51 manufacturing facilities worldwide and 12 global technology centers of excellence that draw from world-leading industry knowledge and manufacturing experience. NSK's dedication to engineering innovation results in state-of-the-art products designed to improve performance and extend service life. NSK's unique Asset Improvement Program helps customers improve productivity and efficiency to significantly reduce operating costs. The company’s industry and process-specific expertise and solutions are applied to identify and solve problems that are limiting productivity. This enables customers to achieve improved performance, enhanced competitiveness and increased profitability.

Schaeffler Group USA, Inc
Schaeffler North America is responsible for the engineering, production, sales and marketing for the INA, LuK, FAG and Barden brands throughout the United States, Canada, Mexico, Central America and the Caribbean. All four brands provide high-performance, precision technologies for the Automotive OEM, Industrial OEM and Distribution markets as well as the Aerospace industry. INA is a leading supplier of rolling bearings, linear motion, engine components, plain bearings and precision components. LuK is a key source for automotive clutch, torque converter, hydraulic and transmission systems. FAG is a major global supplier of bearings with core competencies in ball, taper, cylindrical and spherical bearing products. The Barden Corporation focuses on high precision, miniature and aerospace products.

Articles About rolling


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1 Gear Finishing by Shaving, Rolling and Honing, Part II (May/June 1992)

Part I of this series focused on gear shaving, while Part II focuses on gear finishing by rolling and honing.

2 Mechanical Behavior and Microstructure of Ausrolled Surfaces in Gear Steels (March/April 1995)

Ausforming, the plastic deformation of heat treatment steels in their metastable, austentic condition, was shown several decades ago to lead to quenched and tempered steels that were harder, tougher and more durable under fatigue-type loading than conventionally heat-treated steels. To circumvent the large forces required to ausform entire components such as gears, cams and bearings, the ausforming process imparts added mechanical strength and durability only to those contact surfaces that are critically loaded. The ausrolling process, as utilized for finishing the loaded surfaces of machine elements, imparts high quality surface texture and geometry control. The near-net-shape geometry and surface topography of the machine elements must be controlled to be compatible with the network dimensional finish and the rolling die design requirements (Ref. 1).

3 Effects on Rolling Contact Fatigue Performance--Part II (March/April 2007)

This is part II of a two-part paper that presents the results of extensive test programs on the RCF strength of PM steels.

4 Gear Finishing by Shaving, Rolling and Honing, Part I (March/April 1992)

There are several methods available for improving the quality of spur and helical gears following the standard roughing operations of hobbing or shaping. Rotary gear shaving and roll-finishing are done in the green or soft state prior to heat treating.

5 Effects on Rolling Contact Fatigue Performance (January/February 2007)

This article summarizes results of research programs on RCF strength of wrought steels and PM steels.

6 A Study on Reducing Gear Tooth Profile Error by Finish Roll Forming (July/August 2005)

The authors have developed a rack-type rolling process in which a rack tool is used to roll gear teeth. The results and analysis show that the proposed method reduces errors.

7 Determining Power Losses in the Helical Gear Mesh (September/October 2005)

This article reviews mathematical models for individual components associated with power losses, such as windage, churning, sliding and rolling friction losses.

8 Gear Roll-Finishing (May/June 1987)

In this discussion of gear roll-finishing particular attention is called to the special tooth nomenclature resulting from the interaction between the rolling die teeth and the gear teeth. To eliminate confusion the side of a gear tooth that is in contact with the "approach" side of a rolling die tooth is also considered to be the approach side. The same holds true for the "trail" side. Thus, the side of the gear tooth that is in contact with the trail side of a rolling die is also considered to be the trail side.

9 Hard Gear Finishing (March/April 1988)

Hard Gear Finishing (HGF), a relatively new technology, represents an advance in gear process engineering. The use of Computer Numerical Controlled (CNC) equipment ensures a high precision synchronous relationship between the tool spindle and the work spindle as well as other motions, thereby eliminating the need for gear trains. A hard gear finishing machine eliminates problems encountered in two conventional methods - gear shaving, which cannot completely correct gear errors in gear teeth, and gear rolling, which lacks the ability to remove stock and also drives the workpiece without a geared relationship to the master rolling gear. Such a machine provides greater accuracy, reducing the need for conventional gear crowning, which results in gears of greater face width than necessary.

10 Controlling Carburizing for Top Quality Gears (March/April 1993)

A carburized alloy steel gear has the greatest load-carrying capacity, but only if it is heat treated properly. For high quality carburizing, the case depth, case microstructure, and case hardness must be controlled carefully.

11 Controlling Gear Distortion and Residual Stresses During Induction Hardening (March/April 2012)

Induction hardening is widely used in both the automotive and aerospace gear industries to minimize heat treat distortion and obtain favorable compressive residual stresses for improved fatigue performance. The heating process during induction hardening has a significant effect on the quality of the heat-treated parts. However, the quenching process often receives less attention even though it is equally important.

12 Controlling Tooth Loads In Helical Gears (March/April 1986)

Helical gears can drive either nonparallel or parallel shafts. When these gears are used with nonparallel shafts, the contact is a point, and the design and manufacturing requirements are less critical than for gears driving parallel shafts.

13 Performance Analysis of Hypoid Gears by Tooth Flank Form Measurement (July/August 2002)

The traditional way of controlling the quality of hypoid gears' tooth flank form is to check the tooth flank contact patterns. But it is not easy to exactly judge the tooth flank form quality by the contact pattern. In recent years, it has become possible to accurately measure the tooth flank form of hypoid gears by the point-to-point measuring method and the scanning measuring method. But the uses of measured data of the tooth flank form for hypoid gears have not yet been well developed in comparison with cylindrical involute gears. In this paper, the tooth flank form measurement of generated face-milled gears, face-hobbed gears and formulate/generated gears are reported. The authors discuss the advantages and disadvantages of scanning and point-to-point measuring of 3-D tooth flank forms of hypoid gears and introduce some examples of uses of measured data for high-quality production and performance prediction.

14 Fatigue Aspects of Case Hardened Gears (March/April 1999)

The efficient and reliable transmission of mechanical power continues, as always, to be a central area of concern and study in mechanical engineering. The transmission of power involves the interaction of forces which are transmitted by specially developed components. These components must, in turn, withstand the complex and powerful stresses developed by the forces involved. Gear teeth transmit loads through a complex process of positive sliding, rolling and negative sliding of the contacting surfaces. This contact is responsible for both the development of bending stresses at the root of the gear teeth and the contact stresses a the contacting flanks.

15 Comparison of Surface Durability & Dynamic Performance of Powder Metal & Steel Gears (September/October 1995)

Surface-hardened, sintered powder metal gears are increasingly used in power transmissions to reduce the cost of gear production. One important problem is how to design with surface durability, given the porous nature of sintered gears. Many articles have been written about mechanical characteristics, such as tensile and bending strength, of sintered materials, and it is well-known that the pores existing on and below their surfaces affect their characteristics (Refs. 1-3). Power transmission gears are frequently employed under conditions of high speed and high load, and tooth surfaces are in contact with each other under a sliding-rolling contact condition. Therefore it is necessary to consider not only their mechanical, but also their tribological characteristics when designing sintered gears for surface durability.

16 Gear Manufacturers Face Challenges in Growing Wind Energy Industry (September/October 2003)

East of San Francisco Bay, near the town of Rio Vista, 81 white towers stand 255 feet tall on rolling hills of dry grass harvesting a year-round crop: wind.

17 Product News (March/April 2014)

The complete product news section from the March/April 2014 issue, featuring quick-change spline rolling racks from U.S. Gear Tools.

18 Developing a Total Productive Maintenance System (May/June 1995)

There's a reason they call it catastrophic gear failure: For example, if the line goes down at a large aluminum rolling mill because a gear set goes bad, the cost can run up to a whopping $200,000 a week. Even in smaller operations, the numbers alone (not to mention all the other problems) can be a plant manager's worst nightmare.

19 Application of Statistical Process Capability Indices in Gear Manufacturing (November/December 2014)

This article discusses applications of statistical process capability indices for controlling the quality of tooth geometry characteristics, including profile and lead as defined by current AGMA-2015, ISO-1328, and DIN-3960 standards. It also addresses typical steps to improve manufacturing process capability for each of the tooth geometry characteristics when their respective capability indices point to an incapable process.

20 Morphology of Micropitting (November/December 2012)

Understanding the morphology of micropitting is critical in determining the root cause of failure. Examples of micropitting in gears and rolling-element bearings are presented to illustrate morphological variations that can occur in practice.

21 Cutting Fluid Selection and Process Controls for the Gear Manufacturing Industry (July/August 1987)

The last decade has been a period of far-reaching change for the metal working industry. The effect of higher lubricant costs, technical advances in machine design and increasing competition are making it essential that manufacturers of gears pay more attention to testing, selecting and controlling cutting fluid systems. Lubricant costs are not a large percentage of the process cost relative to items such as raw materials, equipment and labor, and this small relative cost has tended to reduce the economic incentive to evaluate and to change cutting fluids.

22 Single Flank Testing of Gears (May/June 1984)

Presumably, everyone who would be interested in this subject is already somewhat familiar with testing of gears by traditional means. Three types of gear inspection are in common use: 1) measurement of gear elements and relationships, 2) tooth contact pattern checks and 3) rolling composite checks. Single Flank testing falls into this last category, as does the more familiar Double Flank test.

23 Roto Flo's Servo-Actuated CNC to Debut at IMTS (September/October 2008)

Most anyone that has been in the gear industry—or any machining and tooling oriented business, for that matter—is probably at least somewhat familiar with the Roto-Flo workhorse line of hydraulic-actuated spline and thread rolling machines. After all, they’ve been at it for decade

24 Influence of Grinding Burn on Pitting Capacity (August 2008)

This paper intends to determine the load-carrying capacity of thermally damaged parts under rolling stress. Since inspection using real gears is problematic, rollers are chosen as an acceptable substitute. The examined scope of thermal damage from hard finishing extends from undamaged, best-case parts to a rehardening zone as the worst case. Also, two degrees of a tempered zone have been examined.

25 Hard Finishing and Fine Finishing Part 1 (September/October 1989)

Profitable hard machining of tooth flanks in mass production has now become possible thanks to a number of newly developed production methods. As used so far, the advantages of hard machining over green shaving or rolling are the elaborately modified tooth flanks are produced with a scatter of close manufacturing tolerances. Apart from an increase of load capacity, the chief aim is to solve the complex problem of reducing the noise generation by load-conditioned kinematic modifications of the tooth mesh. In Part II, we shall deal with operating sequences and machining results and with gear noise problems.

26 Optimum Shot Peening Specification - I (November/December 1991)

Shot peening is widely recognized as a prove, cost-effective process to enhance the fatigue characteristics of metal parts and eliminate the problems of stress corrosion cracking. Additional benefits accrue in the areas of forming and texturizing. Though shot peening is widely used today, the means of specifying process parameters and controlling documents for process control are not widely understood. Questions regarding shot size, intensity, and blueprint specification to assure a high quality and repeatable shot peening process are continually asked by many design and materials engineers. This article should answer many of the questions frequently asked by engineering professionals and to further assist companies interested in establishing a general shot peening specification.

27 Gear Inspection and Measurement (July/August 1992)

The purpose of gear inspection is to: Assure required accuracy and quality, Lower overall cost of manufacture by controlling rejects and scrap, Control machines and machining practices and maintain produced accuracy as machines and tools wear, Determine hear treat distortions to make necessary corrections.

28 Comparing Surface Failure Modes in Bearings and Gears: Appearances vs. Mechanisms (July/August 1992)

In the 1960's and early 1970's, considerable work was done to identify the various modes of damage that ended the lives of rolling element bearings. A simple summary of all the damage modes that could lead to failure is given in Table 1. In bearing applications that have insufficient or improper lubricant, or have contaminants (water, solid particles) or poor sealing, failure, such as excessive wear or vibration or corrosion, may occur, rather than contact fatigue. Usually other components in the overall system besides bearings also suffer. Over the years, builders of transmissions, axles, and gear boxes that comprise such systems have understood the need to improve the operating environment within such units, so that some system life improvements have taken place.

29 Lubricants and Lubrication of Plastic Gears (September/October 1993)

Surface measurement of any metal gear tooth contact surface will indicate some degree of peaks and valleys. When gears are placed in mesh, irregular contact surfaces are brought together in the typical combination of rolling and sliding motion. The surface peaks, or asperities, of one tooth randomly contact the asperities of the mating tooth. Under the right conditions, the asperities form momentary welds that are broken off as the gear tooth action continues. Increased friction and higher temperatures, plus wear debris introduced into the system are the result of this action.

News Items About rolling

1 Leistritz Buys Rolling Machine Company (January 11, 2004)
Leistritz Produktionstechnik GmbH of Nuernberg, Germany has acquired the rolling machine division of Revue Thommen AG of Tenniken, Switze... Read News

2 Kinefac Introduces Forced Thru-Feed Spline Rolling to China (January 10, 2006)
Kinefac Corp. is introducing its cylindrical die spline rolling process to markets in China, India and other countries in the Far East. ... Read News

3 Quick-Change Spline Rolling Racks Offer Numerous Benefits (April 22, 2014)
U.S. Gear Tools Inc. of Swannanoa, NC has developed the R/C Rack System, a quick-change tooling alternative for spline rolling machines... Read News

4 LMT Fette Offers EVOline Thread Rolling (July 9, 2014)
Rolled threads guarantee maximum strength and resilience in the most demanding situations. LMT Fette has been developing rolling systems ... Read News