{"id":35104,"date":"2025-12-19T11:04:49","date_gmt":"2025-12-19T03:04:49","guid":{"rendered":"https:\/\/firstmold.com\/?p=35104"},"modified":"2026-02-01T20:48:05","modified_gmt":"2026-02-01T12:48:05","slug":"automotive-lightweighting","status":"publish","type":"post","link":"https:\/\/firstmold.com\/pt\/insights\/automotive-lightweighting\/","title":{"rendered":"Como os processos de fabrico permitem a redu\u00e7\u00e3o do peso do autom\u00f3vel"},"content":{"rendered":"\n

Achieving automotive lightweight is vital for boosting fuel economy for internal combustion engine vehicles and extending the range of electric vehicles (EVs). Reducing the vehicle weight by 10% can improve fuel economy by 6\u20148%, as well as cut down carbon dioxide emissions [1]<\/a><\/sup>. The reduction in fuel use also means a reduction in emissions, which is great for environmental sustainability.<\/p>\n\n\n\n

Beyond fuel economy and range improvements, making automobiles lightweight can significantly improve performance, including braking, handling, and acceleration. Also, lightweight manufacturing lowers the strain on suspension, brakes, and tires, which lowers wear and tear. The long-term outcome is that these parts will last longer and need fewer maintenance.<\/p>\n\n\n\n

So, how can manufacturers make automotive parts lighter? Can this be achieved by simply swapping the traditional materials with lightweight alternatives, or does this goal require the rethinking of how automotive parts are designed?<\/p>\n\n\n\n

\"Lightweight<\/figure>\n\n\n\n

Debunking the “Novice Myth” on Lightweight Manufacturing<\/h2>\n\n\n\n

There are lots of misconceptions associated with making lightweight automotive parts. One school of thought says lightweight can be achieved through material choice. In other words, an automobile can be made lighter simply by switching to lighter materials.<\/p>\n\n\n\n

Based on this misconception, they view manufacturing processes like automotive injection molding<\/strong><\/a>, tooling<\/strong><\/a>, and CNC machining<\/strong><\/a> as merely playing the role of \u201claborers\u201d who follow a laid-down blueprint. The second school of thought is that using lighter materials compromises safety. Neither of these schools of thought on lightweight manufacturing of vehicles is true.<\/p>\n\n\n\n

In fact, modern composites have been shown to offer better crashworthiness [2]<\/a><\/sup>. They are more effective in absorbing impact energy compared to metals used in traditional automobiles.<\/p>\n\n\n\n

Automotive Lightweight Manufacturing Using Injection Molding<\/h2>\n\n\n\n

Without a doubt, the choice of material plays an important role in lightweighting. However, optimal strength and form are almost entirely achieved without increasing the weight through design optimization and innovative manufacturing practices as follows:<\/p>\n\n\n\n

1. Hollowing of Sections to Cut Material Use<\/h3>\n\n\n\n

Bulky parts can be created to have hollow interior sections. This void is usually achieved through gas-assisted injection molding<\/strong><\/a> or foaming. For example, in physical foaming, nitrogen gas or carbon dioxide is injected into molten plastic. The gas causes the expansion of the molten plastic in the mold. The molten plastic will trap the gas bubbles, creating an internal structure that is porous and resembles a foam.<\/p>\n\n\n\n

Chemical foaming is also often used, and involves the addition of a chemical blowing agent (CBA) like Azodicarbonamide (ADC) and sodium bicarbonate or citric acid, to the resin. Upon heating, the CBA decomposes and releases gas to create the same effect as experienced in physical foaming. Foaming creates a solid outer skin and a foam-like core. This lowers material usage and helps to keep the product lightweight, without undermining dimensional stability.<\/p>\n\n\n\n

2. Using Ribs to Complement Thin-walled Structures<\/h3>\n\n\n\n

Another important practice in automotive lightweight manufacturing is the use of advanced manufacturing techniques (like thin-wall injection molding and vacuum forming) to create parts with thinner walls (<1mm thickness), while preserving the structural integrity of the part.<\/p>\n\n\n\n

This injection molding technique uses high pressure, speeds (>1000mm\/s), and advanced machinery to ensure proper filling of the thin cavities. Thin walls are usually supported using ribs and gussets<\/strong><\/a> to provide rigidity and strength where these properties are required. Ribs can also prevent defects like sink marks<\/strong><\/a>.<\/p>\n\n\n\n

3. Consolidation of Multiple Parts<\/h3>\n\n\n\n

When an automotive part is made up of multiple components, each of the different components must be welded or fastened together. The welding or fastening agent eventually adds to the weight of the finished part. In lightweight manufacturing, parts that are too complex are redesigned to make it easier to produce them using a single injection molding process.<\/p>\n\n\n\n

Consolidating multiple parts into a single, molded unit eliminates the need for secondary fasteners, such as rivets and bolts, which reduces the part’s weight. However, molds for creating snap-fit designs<\/strong><\/a> that require no extra fasteners during assembly may need the addition of lifters<\/strong><\/a> or sliders<\/strong><\/a>, which will potentially increase their cost. Other benefits of parts consolidation to automotive lightweight include:<\/p>\n\n\n\n