Internal Broaching Machine: A Powerful Tool For High-Precision Internal Hole Processing

In the field of modern machining, there is an increasing demand for high-precision internal holes. Whether it is key components of automobile engines or precision parts in the aerospace field, they are inseparable from efficient and precise inner hole processing technology. As a machine tool specially used to process the surface of internal holes, the internal broaching machine stands out among many processing equipment with its excellent performance and unique advantages, and has become an important tool for achieving high-precision internal hole processing.

What is Internal Broaching Machine?

A broaching tool attached to a broaching machine is pushed or dragged through a workpiece during the broaching manufacturing procedure in machining. Internal broaching is the term for this process. When using internal broaching, the required gear profile is created by pushing or pulling the broaching tool through an already-existing hole.

An internal broaching machine is a machine tool that machines the bore of a workpiece by the linear motion of a broach. The broach has a number of cutting teeth arranged in a certain order, and the height of each cutting tooth increases gradually. When the broach passes through the bore of the workpiece under the action of pulling force, the cutting teeth remove the metal in turn, thus gradually enlarging the size of the bore and obtaining higher precision and better surface quality.

Internal Broaching Machine
What is Internal Broaching Machine?

Read More: Internal Broaching Machine VS. External Broaching Machine

Read More: External Broaching Machine: The Excellent Choice For External Surface Processing

Structural Composition Of Internal Broaching Machine

1.Lathe bed

The bed of the internal broaching machine is the foundation of the entire machine tool. It provides stable support for other components. The bed is usually made of high-strength cast iron, which has good rigidity and shock-absorbing properties.

2.Broaching tool system:

The broaching tool system is the core component of the internal broaching machine. It consists of a broaching tool, a broaching tool chuck and a broaching tool guide device. A broach is a long rod-shaped tool with multiple cutting teeth. The broach chuck is used to fix the broach and ensure the stability of the broach during processing. The broach guide device is used to guide the movement direction of the broach to ensure processing accuracy.

3.Workbench

The workbench is used to install and fix workpieces. The workbench can usually be adjusted horizontally and vertically to accommodate workpieces of different sizes and shapes.

4.Transmission system

The transmission system is used to drive the broach to perform linear motion. The transmission system usually consists of motors, reducers, screws and other components. It can provide sufficient pulling force and speed to ensure the normal operation of the broach.

5.Cooling system

The cooling system is used to reduce the temperature during processing, reduce tool wear, and improve processing quality. The cooling system usually uses coolant spray or cooling oil circulation for cooling.

6.Chip removal system

The chip removal system is used to remove chips generated during machining. Chip removal systems usually use spiral chip conveyors or magnetic chip conveyors to remove chips.

Advantages Of Internal Broaching Machine

1.High Processing Precision

The main reasons why the internal broaching machine can obtain high dimensional accuracy, shape accuracy and low surface roughness are as follows: First, the cutting teeth on the broach are arranged in a certain order and in increasing height, which makes the cutting process smoother. The processing accuracy is higher. Secondly, the broach moves linearly during the machining process, without rotation, which reduces errors caused by rotation. Finally, components such as the bed and worktable of the internal broaching machine have good rigidity and stability, which also helps improve processing accuracy.

In practical applications, internal broaching machines are often used to process parts that require extremely high precision, such as automobile engine blocks and aerospace engine turbine disks. The dimensional accuracy of the inner holes of these parts is usually required to be within a few microns, and the surface roughness is required to be below Ra0.4. Only internal broaching machines can meet such processing requirements.

2.High Production Efficiency

The internal broaching machine can complete rough machining, semi-finishing and finishing machining of the inner hole in one broaching operation, greatly shortening the processing time. Compared with traditional internal hole processing methods, the production efficiency of internal broaching machines can be improved several times or even dozens of times. In addition, the internal broaching machine has a high degree of automation and can realize unattended processing, further improving production efficiency.

3.Wide Adaptability

Internal broaching machines can process various shapes of internal holes, such as round holes, spline holes, keyways, etc. At the same time, the internal broaching machine can also process workpieces of different materials, such as steel, cast iron, aluminum alloy, etc. This makes internal broaching machines widely used in many industries such as automobiles, aerospace, and machinery manufacturing.

Operation Process Of Internal Broaching Machine

1.Workpiece installation

First, install the workpiece on the workbench and fix it. When installing, ensure the position accuracy and clamping force of the workpiece are moderate to avoid displacement or deformation during processing.

2.Broach selection and installation

Select the appropriate broach according to the size and shape of the inner hole of the workpiece. Then, install the broach on the broach chuck and adjust it to ensure the position accuracy of the broach and the sharpness of the cutting edge.

3.Parameter setting

According to the material and processing requirements of the workpiece, set appropriate processing parameters, such as broaching speed, pulling force, feed amount, etc. Parameter settings must be reasonable to avoid affecting processing quality and tool life.

4.Start processing

After completing the above steps, start the internal broaching machine for processing. During the processing, pay attention to the processing status, such as cutting force, temperature, sound, etc. If there are any abnormalities, stop the machine for inspection in time.

Development Trends Of Internal Broaching Machines

Technological Innovation

  1. Tool materials: With the continuous development of materials science, new tool materials are constantly emerging. These new tool materials have higher hardness, strength and wear resistance, which can improve the processing efficiency and tool life of internal broaching machines.
  2. Structural design: The structural design of the internal broaching machine is also constantly innovating. For example, the use of modular design can improve the versatility and maintainability of machine tools; the use of automated tool changing systems can improve processing efficiency and automation.
  3. Control system: The control system is the core part of the internal broaching machine. Its performance directly affects the processing accuracy and efficiency of the machine tool. At present, the control system of internal broaching machines is developing towards intelligence and networking, enabling remote monitoring and fault diagnosis.

Intelligent Development

  • Automated production: The combination of internal broaching machine and automated production line can realize unattended processing and improve production efficiency and product quality. For example, using robots to load, unload, and transport workpieces can reduce manual operations and improve production safety.
  • Remote monitoring: Through network technology, remote monitoring and fault diagnosis of the internal broaching machine can be achieved. Operators can monitor the operating status of machine tools in real time on the remote terminal, discover and solve problems in a timely manner, and improve the reliability and stability of the equipment.

What Are The Common Faults And Solutions Of Internal Broaching Machines?

Internal broaching machines may encounter a variety of faults during use. Understanding these faults and their solutions is crucial to improving production efficiency and equipment service life. The following are some common internal broaching machine failures and corresponding solutions:

Faults 1: Spindle failure

including bearing damage, excessive bearing clearance, etc.

The solution is to regularly check and replace the bearings to ensure they are working properly, and adjust the bearing clearance as needed

Faults 2: Transmission system failure

such as loose transmission belt, worn transmission gear, etc.

The solution is to regularly check the tension of the transmission belt and promptly replace worn transmission gears to maintain the normal operation of the transmission system.

Faults 3: Tool failure

including tool wear, tool looseness, etc.

The solution is to regularly check the wear of the tools, replace worn tools in a timely manner, and ensure that the tools are firmly installed.

Faults 4: Cooling system failure

such as coolant pump failure, coolant temperature is too high, etc.

The solution is to regularly check the working status of the coolant pump to ensure smooth circulation of the coolant and maintain the appropriate temperature of the coolant

Faults 5: Control system failure

including control panel failure, damage to electrical components, etc.

The solution is to regularly check the working status of the control system, promptly replace damaged electrical components, and keep the control panel clean and operating normally.

Read More:Troubleshooting For Broaching Operation

Maintenance Of Internal Broaching Machine

Routine maintenance

Routine maintenance mainly includes cleaning, lubrication and inspection. After every day’s work, the machine tool should be cleaned to remove chips and oil. Lubricate all parts of the machine tool regularly to ensure normal operation. At the same time, it is necessary to regularly check whether the various components of the machine tool are loose or worn. If there are any problems, they should be repaired or replaced in time.

Regular maintenance

Regular maintenance mainly includes equipment calibration, component replacement and system upgrades. Calibrate the accuracy of machine tools regularly to ensure processing accuracy. Replace the broach in time according to the wear of the tool. At the same time, attention should be paid to the upgrade and maintenance of the machine tool control system to improve the performance and stability of the machine tool.

Application Of Internal Broaching Machines

Internal broaching machines are widely used in automobile, aerospace, shipbuilding, machinery manufacturing and other industries, and have become processing equipment in these industries.

In the automotive manufacturing industry, vertical internal broaching machines are often used to process key components such as engine blocks, crankshafts, and reducer housings;

in the aerospace field, vertical internal broaching machines are used to process aircraft engine parts, aviation hubs, etc. High-precision parts;

in the machinery manufacturing industry, vertical internal broaching machines can process various complex-shaped parts, such as gears, bearing seats, etc.

Conclusion

As a tool for high-precision internal hole processing, the internal broaching machine plays an important role in the field of modern mechanical processing. It has the advantages of high processing precision, high production efficiency, and wide adaptability, providing strong support for the development of many industries. With the continuous innovation and intelligent development of technology, the performance and functions of internal broaching machines will continue to improve, bringing more surprises and opportunities to the mechanical processing industry. We have reason to believe that in the future development, internal broaching machines will continue to exert their unique advantages and make greater contributions to the advancement of manufacturing.So if you wanna learn more about Internal Broaching Machine,please contact us.

Scroll to Top
Get In Touch