• June 21, 2024
  • Shatou, Changan, Dongguan, CN

What is reaming and how is it done?

Reaming is a precision machining operation that improves the quality and functionality of machined parts by expanding the diameter of existing holes to exact dimensions and surface finishes. The use of the reaming process yields the best results, including optimum diameter accuracy, dimensional tolerances and surface finish, for various industries such as parts and machine building, repair and maintenance.

This article describes its machining capabilities and provides information on the role, types, and process flow of reaming.

1. Definition and role of reaming

Reaming is the process of making holes of the same shape in two or more parts of an object, which are then joined together by a hinge. The main functions of reaming are as follows:

1) Kinematic connection: A hinge hole allows two objects to move relative to each other in a certain plane around the hinge axis to achieve an open-close or rotating connection. Common applications include doors, windows and other opening and closing structures.

2) Fixed support: Hinged holes improve the fixation effect of objects by increasing the connection area, and can withstand larger static or dynamic loads. Therefore, reamed connections are commonly used in some structures with fixed supports.

3) Rotation control: The hinge hole can be used as the rotation axis of the rotating parts, and the control of rotation can be achieved by adjusting the parameters of friction and tightness of the hinge. For example, in a mechanical device, a hinged connection allows the control and positioning of a rotating rod.

In general, the role of a reamed hole is to connect and hold objects and achieve control of movement or rotation. Reamed holes are a common and important connection in engineering design and manufacturing.

2. Types of Reamed Holes

Reaming is a common mechanical process used to machine holes in metal or other materials to allow for some rotational movement. Depending on their shape, function and use, reamed holes can be divided into the following types:

1) Rolling reaming: It is usually used to machine holes with higher precision and smoothness in workpieces that have already been drilled or punched. Roll reaming has a slower cutting speed, but produces more accurate hole diameter and surface quality.

2) Drill reaming: A combination of reamer and drill bit that enables both drilling and reaming. It is suitable for workpieces that do not require high hole diameter and surface quality.

3) Thread reaming: Used for processing threaded holes in workpieces that have already been drilled. Thread reaming can process both female and male threaded holes.

4) Taper reaming: Used for processing tapered holes, often used for tapered pins and tapered pinhole fits.

5) Chamfer reaming: used for machining bevels or chamfers in the workpiece orifice. Chamfer reaming can improve the assembly performance and service life of the workpiece.

6) Double taper reaming: processing of two different diameter conical holes, often used to connect two different diameter parts.

7) Equal diameter reaming: processing through multiple levels of reamers to achieve holes of different diameters.

These types of reaming can be selected and applied according to specific machining requirements and workpiece design needs.

3. Process flow of reaming

Reaming is a common machining method used to process holes with high accuracy and surface quality requirements. The process flow of reaming generally includes the following steps:

1) Determine the processing size and processing method: Determine the size and location of the reamed hole and select the appropriate reamer for processing.

2) Prepare the workpiece: The workpiece to be machined is mounted on the worktable and fixed to ensure its stability and accuracy.

3) Select the appropriate cutting fluid: According to the requirements of the workpiece material and the cutting tool, select the appropriate cutting fluid and prepare it.

4) Carry out reaming process: Use suitable process parameters and cutting fluid to carry out the reaming process on the reaming machine. According to the processing sequence, rough machining is carried out first, followed by semi-finishing and finishing, and finally finishing.

5) Cleaning the workpiece: The machined workpiece is cleaned to remove impurities and residual cutting fluid to ensure the surface quality of the workpiece.

6) Quality inspection and dressing: The machined hole is quality inspected to check whether its size and surface quality meet the requirements. If there is any problem, it needs to be trimmed.

7) Final finishing: Remove debris and cutting fluid from the workbench, and maintain and finish the equipment.

To sum up, the process flow of reaming includes the steps of preparation, selecting cutting fluid, performing the reaming process, cleaning the workpiece, quality inspection and finishing, and final finishing. Different workpieces and requirements may vary, and the specific process flow should be adjusted according to the specific situation.

4. Tools and equipment for reaming

Reaming is a machining process used to make bearing holes or hole connections. The following are some commonly used reaming tools and equipment:

1) Reamer: The reamer is the main tool used for reaming holes. It is usually made of HSS or carbide and has one or several edges that can be rotated to cut the workpiece to form the hole.

2) Reamer: The reamer is the device used to hold and support the reamer. It is usually made of cast iron or steel, has a tool holder and a seating surface, and can be adjusted by a screw device to achieve different sizes of reamed holes.

3) Spiral device: The spiral device is used to adjust the reamer position and tilt angle on the reaming seat to accommodate different reaming requirements.

4) Coolant system: During reaming, coolant can be used to cool the workpiece and cutting area to reduce friction and heat in order to improve the cutting effect and tool life.

5) Fixture: A fixture is used to fix the workpiece to ensure the stability and accuracy of the workpiece during the reaming process.

6) Measuring tools: Measuring tools, such as micrometers, vernier calipers and mirror bottom lights, can be used to measure the size and quality of reamed holes.

In addition to the above tools and equipment, proper cutting speeds, feeds and tool materials are required to ensure the quality and efficiency of the reaming process.

5. Precautions for reaming

1) Preparation: Before reaming, the desired hole size and location must be measured and determined. Hold the workpiece in place to ensure its stability and accuracy.

2) Use appropriate tools: Select the appropriate reamer or reaming tool for the reaming operation. Select the appropriate tool according to the application requirements to ensure the accuracy and quality of the bore.

3) Control reaming speed: Maintain proper feed rate and cutting speed when reaming holes so that excessive frictional heat can be avoided, thus protecting the workpiece and tool.

4) Cooling and lubrication: Use cooling lubricants to reduce cutting temperature and friction during reaming to improve the quality of the workpiece surface and extend the life of the tool.

5) Regular inspection of tools: Inspect and replace tools regularly to ensure their cutting effectiveness and accuracy. If the tool is badly worn or produces malfunctions, it should be stopped immediately and repaired or replaced.

6) Adjust the reaming depth: Adjust the reaming depth as needed. During the reaming operation, the tool position should be adjusted gradually to gradually reach the required hole depth.

7) Handling the bottom of the hole: After reaming is completed, promptly clean the remaining material and debris from the bottom of the hole to ensure the accuracy of the hole diameter and surface quality.

8) Safety measures: Wear appropriate personal protective equipment, such as safety glasses and gloves, during the reaming process to prevent possible cutting injuries or spatter injuries.

9) Follow operating procedures: Follow proper operating procedures and safe operating procedures to ensure the safety and accuracy of the reaming operation.

6. Common process parameters for reaming

Reaming is a process used to process holes with larger apertures and is commonly used in the processing of iron, steel, aluminum alloys and other materials. The following process parameters are commonly used for reaming:

1) Hole size: The size of the hole for reaming is determined according to the required specifications and requirements, which can usually be achieved by selecting reamers of different sizes or adjusting the tool.

2) Reaming depth: Reaming depth refers to the effective machining depth of the reamed hole and is usually determined according to the design requirements.

3) Feed volume: The feed volume between the tool and the workpiece during reaming can be controlled by adjusting the feed device.

4) Spindle speed: The rotational speed of the tool during reaming. The appropriate speed is selected according to the material and the type of tool.

5) Feed rate: The feed rate of the tool during reaming can be controlled by adjusting the feed rate of the feed device.

6) Cutting lubricant: Using the appropriate cutting lubricant during the reaming process can reduce friction and heat, and improve cutting results and tool life.

Depending on the specific workpiece and machining requirements, these parameters may be adjusted. Therefore, in practice, reasonable adjustment and control based on process specifications and test experience are required.

7. Reaming quality inspection methods

The quality inspection methods of reamed holes mainly include the following:

1) Visual inspection: The quality of reamed holes is judged by visual observation of the smoothness of the reamed surface and whether there are defects such as scratches or dents on the surface.

2) Measuring tools: Using measuring tools such as vernier calipers and mirror base screw gauges to measure the diameter, depth and other dimensional parameters of the reamed hole and compare them with the design requirements.

3) Mirror inspection method: Use a magnifying glass or microscope to observe the details of the reamed hole surface and check for defects such as burrs, cracks and bubbles.

4) Colorimetric method: Use colorimetric cards or color plates to compare with the reamed hole surface color to determine whether the reamed hole surface has discoloration or oil stains, etc.

5) Non-contact measuring instrument: Use optical or laser measuring instruments to scan or measure the reamed hole in three dimensions to obtain the precise geometry data of the reamed hole and compare it with the design requirements.

6) Inspection equipment: High-precision measuring equipment such as projectors and CMMs can be used for comprehensive inspection and evaluation of the geometric dimensions and positional errors of the reamed holes.

It is necessary to select the corresponding testing methods according to the specific reaming requirements and quality standards to ensure that the quality of reamed holes meets the design requirements.

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