In manufacturing, the precise machining of threaded holes is critical, and it is directly related to the stability and reliability of the entire assembled structure. During the manufacturing process, any small error in thread depth and pitch can lead to product rework or even scrap, bringing double losses in time and cost to the organization.
This article provides you with four practical tips to help you avoid common errors in the threading process.
Reasons for thread depth and pitch errors:
1. Incorrect tap: Use a tap that is not suitable for the hole type.
2. Dulled or damaged taps: Using dulled taps can lead to excessive friction, scuffing and work hardening between the workpiece and the tool.
3. Inadequate chip removal during the tapping process: Especially for blind holes, poor chip removal can be extremely detrimental to the quality of the threaded hole.
Top 4 tips for thread depth and pitch:
1. Select the proper tap for the application: For manual tapping of blind holes, manufacturers should first use a standard tapered tap and then use a bottom hole tap to tap the entire hole depth. For through holes, it is recommended that manufacturers use a straight fluted tap for manual tapping or a helical point tap for power tapping.
2. Match the tap material to the workpiece material: To prevent abrasions from affecting part quality, be sure to use a lubricant when tapping the workpiece. Alternatively, consider using a thread milling cutter on difficult-to-tap materials or expensive parts, where a broken tap could ruin the part.
3. Don’t use dull or damaged taps: To avoid incorrect thread depths and pitches due to damaged taps, manufacturers can ensure that tools are sharp through regular tool inspections. Worn taps can be resharpened once or twice, but after that it’s best to buy a brand new tool.
4. Verify operating conditions: If the hole has an incorrect thread depth and pitch, verify that the machine’s operating parameters are within the recommended range for the tapped workpiece. The operator should ensure that proper tapping speeds are being used to avoid torn or ragged threads, that the taps and drilled holes are well aligned to prevent unqualified threads and excessive torque that could cause taps to break, and that both the tool and the workpiece are securely fastened or vibration could result and damage the tool, machine and workpiece.
Post time: Aug-29-2024