Tires are critical components of the vehicles on which they are used. They are used on automobiles, trucks, buses, farm tractors, earth-moving equipment, military vehicles, bicycles, motorcycles, and aircraft. Tires support the weight of the vehicle and the passengers and cargo on board; they transmit the motor torque to propel the vehicle (except on aircraft); and they absorb vibrations and shock to provide a comfortable ride.
A tire is a textile/rubber composite. The tire composite is in the form of a network of textile cord structures arranged in a parallel configuration and imbedded in a rubber matrix. Rubber defined as an elastomer compounded with various fillers and chemical ingredients . Most rubber compounds are thermosets, and they are turned into finished molded parts by compression, transfer or injection molding.
The tire is made up of numerous different rubber compounds, many different types of carbon black, fillers like clay and silica, and chemicals & minerals added to allow or accelerate vulcanization. The tires also have several types of fabric for reinforcement and several kinds and sizes of steel. Some of the steel is twisted or braided into strong cables.
Table of Contents
1. INTRODUCTION
2. TIRE FEEDSTOCK MATERIALS
2.1. Elastomers
2.2. Reinforcing fillers
2.3. Reinforcing fibers
2.4. Additives
3. TIRE CONSTRUCTION
4. TIRE MANUFACTURING
4.1. Preforming of Components
4.2. Building the Carcass (Tire assembly)
4.3. Molding and Curing
5. TIRE PROPERTIES
5.1. Mechanical properties of tire composite material
5.2. Performance properties of tires.
6. TIRE TESTING
7. TIRE DEGRADATION
8. TYPES, COST ANALYSIS AND MARKET OF AUTOMOTIVE TIRES.
8.1. Types of tires
8.2. Cost of automotive tire
8.3. Market of automotive tires
9. TIRE RECYCLING
9.1. 8.1 Retreading of tires.
9.2. Recovery of tire materials
9.3. Use of recovered tire rubber
10. FUTURE OF TIRES
11. REFERENCES
Objectives and Topics
This case study provides a comprehensive technical overview of automotive tires, focusing on the material composition, engineering principles of construction, and manufacturing processes that transform raw elastomers and reinforcing fibers into high-performance components. It addresses the mechanical challenges of tire composites, the impact of tire degradation, market dynamics, and sustainable methods for material recovery and recycling.
- Material composition, including natural/synthetic elastomers and reinforcing fillers.
- Structural design classifications: bias, belted-bias, and radial ply constructions.
- Manufacturing processes: from preforming components to molding and curing.
- Performance characterization, including friction, rolling resistance, and vibration analysis.
- Advancements in tire recycling, devulcanization, and future material alternatives like polyurethane.
Excerpt from the Book
4.3. Molding and Curing
Tire molds are usually two-piece construction (split molds) and contain the tread pattern to be impressed on the tire. The mold is bolted into a press, one half attached to the upper platen (the lid) and the bottom half fastened to the lower platen (the base). The uncured tire is placed over an expandable diaphragm and inserted between the mold halves, as in Figure 8 and Figure 9. The press is then closed and the diaphragm expanded, so that the soft rubber is pressed against the cavity of the mold. This causes the tread pattern to be imparted to the rubber. At the same time, the rubber is heated, both from the outside by the mold and from the inside by the diaphragm. Circulating hot water or steam under pressure are used to heat the diaphragm. The duration of this curing step depends on the thickness of the tire wall. A typical passenger tire can be cured in about 15 minutes. Bicycle tires cure in about 4 minutes, whereas tires for large earth-moving equipment take several hours to cure. After curing is completed, the tire is cooled and removed from the press.
Summary of Chapters
1. INTRODUCTION: An overview of the tire as a critical textile/rubber composite component for various vehicles and its functional role in supporting loads and absorbing vibrations.
2. TIRE FEEDSTOCK MATERIALS: Discusses the diverse array of raw materials used in tire composition, including elastomers, reinforcing fillers, reinforcing fibers, and chemical additives.
3. TIRE CONSTRUCTION: Explains the basic tire constructions—diagonal ply, belted bias, and radial ply—and the internal carcass structure.
4. TIRE MANUFACTURING: Details the three-step production cycle involving component preforming, carcass assembly, and the molding/curing process.
5. TIRE PROPERTIES: Analyzes the mechanical characteristics of tire composites and the performance requirements such as traction, rolling resistance, noise, and tire wear.
6. TIRE TESTING: Describes the various indoor and outdoor testing protocols, including handling tests, high-speed indoor drum tests, and non-destructive X-ray examination.
7. TIRE DEGRADATION: Explores the mechanisms of thermal and environmental degradation (Dry Rot) and the chemical reactions involved in rubber deterioration.
8. TYPES, COST ANALYSIS AND MARKET OF AUTOMOTIVE TIRES.: Covers tire classification, a detailed cost breakdown of materials, and current market trends.
9. TIRE RECYCLING: Reviews sustainable end-of-life options, focusing on retreading, recovery of materials, and novel devulcanization technologies.
10. FUTURE OF TIRES: Discusses the pursuit of alternative materials, specifically research into polyurethane compounds as a potential replacement for traditional rubber.
11. REFERENCES: A bibliography of the academic and technical sources utilized in the study.
Keywords
Composite materials, Automotive tires, Elastomers, Rubber, Vulcanization, Tire construction, Radial ply, Rolling resistance, Tire recycling, Devulcanization, Carbon black, Silica, Tread wear, Tire performance, Polyurethane
Frequently Asked Questions
What is the primary focus of this work?
This work provides an in-depth technical analysis of the composition, manufacturing, and performance characteristics of modern automotive tires.
What are the central themes of the document?
The central themes include material science in tire production, the engineering of tire structures, performance metrics, and sustainable lifecycle management of waste tires.
What is the core objective of the research presented?
The objective is to explain how disparate materials like elastomers and reinforcing fibers are combined to achieve the complex structural and performance requirements of tires used in diverse transport applications.
Which scientific methods are primarily utilized?
The text employs materials analysis, mechanical testing methodologies, stress-strain characterization of composites, and literature review regarding manufacturing and recycling processes.
What aspects of tire production are covered in the main body?
The main body covers material selection, construction techniques (preforming, building, and curing), testing methodologies, failure analysis, and recycling technologies.
Which key terms best characterize this study?
Key terms include composite materials, tire construction, rubber friction, rolling resistance, and sustainable tire recycling techniques.
What is the significance of the "green tire" phase?
The "green tire" refers to the fully assembled, un-cured state of the tire before it undergoes the final molding and vulcanization process, which solidifies its final form and performance properties.
How does tire degradation affect safety?
Degradation, often manifesting as "Dry Rot" due to UV and ozone exposure, weakens the rubber matrix through chain scission, leading to reduced elasticity and structural integrity, which significantly impacts road safety.
- Citar trabajo
- Ahmed Ibrahim (Autor), 2016, Composite Material for Automotive Tires. Construction, Manufacturing, Properties, Testing, Degradation, Recycling, Múnich, GRIN Verlag, https://www.grin.com/document/1139773
