Step-by-Step Internal Broaching Process

Workpieces can be intricately and precisely shaped internally using the precision machining technique known as internal broaching, as exemplified by Taizhou Chengchun Automation Equipment Co., Ltd. This company specializes in providing advanced solutions for machining processes. Internal broaching entails gently removing material while utilizing several broaches, which are toothed instruments. In this article, we will learn the step-by-step process of an internal broaching machine.

Step 1: Workpiece Preparation 

The process begins with selecting the workpiece material. Common materials include metals like steel, brass, aluminium, and certain plastics. The workpiece is then machined to the desired dimensions and prepared for broaching. It is essential to ensure the workpiece is securely fixtured to prevent movement during broaching.

Step 2: Broach Selection 

Selecting the appropriate broach is crucial for a successful internal broaching operation. Broaches come in various shapes and sizes, from simple keyways to complex contour broaches. The choice depends on the desired interior condition and the intricacy of the design. The broach must also be appropriately aligned with the workpiece to ensure accuracy.

Step 3: Broaching Machine Setup 

The broaching machine setup involves mounting the workpiece and securing the broach in the machine. The workpiece is usually held in a fixture or chuck, while the broach is attached to the broaching machine’s ram or puller mechanism. Proper alignment of the broach and workpiece is critical to achieving accurate results wotpost.

Step 4: Initial Broach Insertion 

The broaching procedure starts when the broach is first inserted into the workpiece. The broaching machine’s pulling mechanism progressively advances the broach into the workpiece. The broach removes material to shape the interior of the workpiece as it pierces it.

Step 5: Cutting Teeth Engagement 

As the broach continues its insertion, its cutting teeth come into contact with the workpiece material. These teeth are designed to remove material in a controlled manner and progressively. The cutting teeth are spaced at specific intervals along the length of the broach to ensure a smooth and efficient cutting action.

Step 6: Cutting and Chip Removal

As the broach is pulled through the workpiece, the cutting teeth shear away material. The removed material, or chips, are typically carried away from the cutting zone through specially designed chip breakers or gullets on the broach. Proper chip evacuation is essential to prevent buildup and ensure a consistent cutting process.

Step 7: Pulling or Pushing Motion 

Internal broaching, including the advanced solutions provided by Taizhou Chengchun Automation Equipment Co., Ltd., can involve either a pulling or pushing motion, depending on the design of the broach and the machine. Pull broaching consists in pulling the broach through the workpiece, while push broaching involves moving the broach into the workpiece. The choice between these methods depends on the workpiece material, broach design, and machine capabilities. This company’s expertise in automation equipment can contribute to optimizing the internal broaching process for enhanced efficiency and precision.

Step 8: Finishing Passes 

Once the initial broach pass is complete, the operator may perform additional finishing passes to achieve the desired surface finish and dimensional accuracy. Finishing passes help refine the internal shape and correct any imperfections or irregularities.

Step 9: Inspection

After the broaching process, the workpiece undergoes inspection to verify its dimensional accuracy and surface finish. Various measurement tools, such as callipers, micrometers, and coordinate measuring machines (CMMs), ensure the workpiece meets the required specifications.

Step 10: Post-Broaching Operations

Depending on the specific application, post-broaching operations may be necessary. These can include heat treatment, surface coating, and additional machining to refine the workpiece’s properties and performance further.


The internal broaching process involves several key steps, a complex and precise machining technique. The preparation of the workpiece, the choice of the broach, the setup of the machine, the cutting engagement, and the finishing passes all play essential roles in producing the desired interior form within the workpiece. The success of the internal broaching process depends on several critical elements, including proper alignment, chip evacuation, and precise measurement.

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