The formulation process of friction materials—such as automotive brake pads, clutch discs, and railway brake shoes—is hailed as “the industrial realization of the art of formulation.” Due to the wide variety of raw materials involved (typically… 30–60 Due to characteristics such as diverse material types, significant variations in morphology (ranging from nanoscale graphite to centimeter‑scale steel fibers), substantial impacts of trace additives on performance, and high dust generation during the feeding process, the design and manufacturing of its automation systems are subject to extremely stringent requirements.

The following is a classification and application of automated friction material batching systems:

I. Classification by System Structure and Mode of Motion (Core Classification)

This is a crucial classification that determines factory layout, investment costs, and environmental performance.

1.  Mobile Automatic Batching System (Mobile Weighing System)  

Structural Features:

Integrate the high‑precision weighing hopper, material receiving port, and dust removal interface into… RGV Rail‑guided vehicles or AGV On a trackless trolley.

The small vehicle automatically shuttles along tracks beneath dozens of raw material silos, picking up materials one by one and accumulating them for weighing.

Adopting a “one vehicle, multiple silos, one vehicle, multiple mixers” model, where a single vehicle serves all material silos and can also operate multiple mixers.

Equipped with a fully enclosed, sealed docking technology (telescopic interface) to achieve dust-free material loading and unloading.

Main uses:

Multi‑variety, small‑batch production: Ideal for manufacturing passenger car brake pads (with up to… 40–50 Plant, and switch frequently.

Scenarios with high dust levels and stringent environmental requirements: Thoroughly address the issue of graphite and metal powder being blown into the air, meeting the most rigorous environmental protection and safety supervision standards.

Space‑constrained facilities: Save floor space and eliminate the need to reserve separate weighing areas for each type of raw material.

High‑Value Raw Material Management: Prevent cross‑contamination and precisely control expensive raw materials such as copper fiber, aramid, and graphite.

Representative advantages: Core products from companies such as Wuxi Xielì are precisely this type, and they have become the standard configuration for upgrading and replacing products in the friction materials industry today.

2.  Stationary Multi-Balance Dosing System (Fixed Multi-Scale System)

Structural Features:

Install a fixed weighing platform beneath the hopper.

The “group weighing” strategy is typically employed: raw materials are divided into “major ingredient groups” (matrix materials, such as iron powder and mineral powder) and “minor ingredient groups” (functional materials, such as fibers, resins, and friction powders).

Each group is equipped with a separate weighing hopper, which weighs simultaneously before the contents are combined and fed into the mixer.

Main uses:

Mass production of a small number of varieties: Suitable for manufacturers of commercial vehicle brake pads, train brake shoes, and other products with relatively fixed formulations and extremely high single‑batch output.

High production takt time requirements: Multiple scales operate in parallel, with short batching times per batch and high efficiency.

Limitations: Large land footprint (requiring a massive steel structure platform), poor flexibility, difficulty in adding new raw materials, and numerous dust control points that are hard to manage.

3.  Artificially Assisted Semi-Automatic Batching System (Semi-Auto with Manual Station)

Structural Features:

Bulk raw materials (accounting for the formulation 80% Above) Through automatic spiraling / The vibrating feeder enters the automatic scale.

Trace, valuable, or specially shaped raw materials (such as short fibers, whiskers, or small amounts of resin) are weighed manually at dedicated manual weighing stations, then either poured into the automated system or directly fed into the mixer.

The system is equipped with a fail-safe scanner and permission management.

Main uses:

Transition Period for Old Production Line Modernization: Enterprises with limited budgets that cannot automate their entire production line.

Specialized Raw Material Handling: For certain raw materials that are highly prone to bridging, static electricity, or require special pre‑treatment, automated processing is challenging; therefore, manual operations will be retained for the time being.

Risk: There is still a risk of human error and dust exposure, making this a gradually phased-out solution.

2. Classification by Metering Control Strategies

1.  Incremental Cumulative Weighing (Cumulative Weight Gain)

Principle: The moving vehicle or fixed scale starts with an empty weight and sequentially adds raw materials. 1 , Raw Materials 2... Until all materials are fully stocked.

Purpose: 90% The above friction material batching system uses this method.

Advantages: The equipment has a simple structure, is easy to fully enclose, and is suitable for multi‑component formulations.

Challenge: Address the reading fluctuations caused by “adding materials after first adding materials,” which requires advanced filtering algorithms.

2.  Reduced-Weight Weighing (Loss-in-Weight)

Principle: Each hopper is equipped with a gravimetric scale, which continuously feeds material by controlling the rate of weight reduction.

Applications: Primarily used in continuous mixing processes (less common), or for extremely small quantities of additives ( <0.5% ) a separate, precise addition module.

Advantages: Extremely high dynamic accuracy, unaffected by changes in material bulk density.

3.  “Big and Small Materials” Dual-System Coordination

Principle:

Bulk Material System: Use high‑capacity scales (such as 500kg grade), quickly weigh iron powder, barium sulfate, and other matrices with a precision requirement of ± 1%。

Small ingredient system: Uses high‑precision small scales (such as 50kg grade), specifically for weighing graphite, resin, fibers, etc., with a precision requirement of ± 0.1% Even higher.

The two systems operate in parallel or in series.

Applications: Balancing efficiency and precision—ensuring both high production speed for large batches and high accuracy for critical friction‑performance components.

3. Core Applications and Industry Pain Points Addressed

The core mission of the friction material formulation automation system is to “perfectly replicate laboratory formulations in industrial production,” specifically addressing the following issues:

Digital Error Prevention: The system enforces sequential ingredient addition, verifies with barcodes, and triggers alarms for underaddition, no addition, or overaddition, thereby eliminating human error.

Targeted Feeding Technology: Integrates multiple feeding methods such as arch-breaking mixing, low-speed screw conveyors, and vibratory feeders to accommodate various material characteristics.

High‑precision metrology: Adopted C3/C6 Level sensor + Dynamic filtering ensures that the precision of trace components is controlled within… ±0.1% Within.

Inherently Safe Design: Fully Enclosed Mobile Batching +  Negative Pressure Dust Removal +  Anti-static / Explosion‑proof electrical design eliminates explosion hazards and protects workers’ health.

Full-Process Data Black Box: Automatically records detailed weighing data, timestamps, and operator information for each batch, generating quality reports to meet… IATF 16949 and host manufacturer review.

IV. Detailed Analysis of Typical Application Scenarios

1.  Passenger car disc brake pads (Passenger Car Disc Pads)

Features: The most complex formulation ( 40–60 (Various raw materials), with a high proportion of non‑metallic fibers, the strictest environmental requirements, and numerous batches.

Recommendation System: High‑Precision Mobile Automatic Batching System. This is the standard equipment for today’s high‑end brake pad manufacturers, perfectly capable of handling multi‑variety switching and meeting stringent precision requirements.

2.  Commercial Vehicle Drum Brake Pads (Truck/Bus Drum Linings)

Features: High single‑batch output, a relatively mature and stable formulation, and a high content of steel fibers and mineral powder.

Recommendation System: Fixed Multi-Scale System (Pursuing Efficiency) or ? Large mobile systems that balance flexibility with environmental friendliness.

3.  Train / High-speed rail brake pads (Railway Brake Shoes)

Features: Large single-unit weight, extremely high requirements for strength consistency, and relatively coarse raw material particles.

Recommendation System: Heavy-duty fixed batching systems or high-capacity mobile systems, emphasizing the impact resistance of weighing sensors and high-capacity feeding rates.

4.  Clutch disc (Clutch Facings)

Features: Extremely sensitive to frictional stability and often contains expensive organic fibers and special fillers.

Recommendation System: A high‑purity mobile batching system, with a primary focus on preventing cross‑contamination and achieving precise control over trace components.

V. Summary

In the friction materials industry, mobile automatic batching systems have gradually replaced traditional fixed and manual methods, becoming the mainstream choice for new production lines and technological upgrades.

The core of classification lies in the choice between “motion” and “stillness.”

Core purpose: To strike a balance among the “multi‑component, high‑precision, zero‑dust, traceable” impossible triangle.

Value Proposition: It is not merely a set of weighing equipment—it is the core infrastructure that enables friction material manufacturers to enhance product consistency, pass OEM audits, and achieve green, intelligent manufacturing.

For specialized suppliers like Wuxi Xielì, the success of their mobile systems stems from a deep understanding of the industry’s characteristics—namely, that friction materials are “high in raw materials, generate significant dust, and require precise formulations”—and from their relentless pursuit of excellence in two core technological areas: dynamic weighing stability and fully enclosed dust prevention.