The choice of tool holder in the field of CNC machining has a significant impact on machining accuracy and efficiency. This article will delve into the technical features, performance differences, and suitable machining scenarios of press fit and hydraulic holders, helping you make the right choice in actual production.
Press fit tool holders
Press fit tool holders use a mechanical rotating clamping method that generates radial pressure through a threaded structure. Their clamping force typically reaches 12000-15000 N, suitable for general machining needs.
Press fit tool holders have a simple structure and are easy to maintain, with a clamping accuracy of 0.005-0.01 mm, performing stably in conventional machining.
They are cost-effective, with a purchase cost typically ranging from 1000 to 3000 yuan, making them the preferred tool for many small-scale machining enterprises.
Hydraulic holders
Hydraulic holder uses the principle of high-pressure fluid transmission to generate uniform radial pressure through hydraulic media, far surpassing press fit tool holders.
Hydraulic holders offer a clamping accuracy of up to 0.003 mm, with coaxiality controlled within the range of 0.002-0.005 mm, ensuring machining accuracy.
They have excellent anti-vibration performance, reducing vibration amplitude by more than 40% compared to press fit tool holders during high-speed cutting.
Clamping stability
The 360-degree uniform force of the hydraulic holder is significantly better than the local force of the press fit tool holder.
Dynamic balance performance
The dynamic balance level of hydraulic holders can reach G2.5 during high-speed operations above 20000 rpm, while the press fit tool holder is generally G6.3.
Service life
Under the same working conditions, the service life of hydraulic holders is usually 2-3 times that of press fit tool holders.
Press fit tool holders are suitable for：
Machining of parts with ordinary precision, such as general mechanical parts and construction accessories.
Conventional cutting with speeds below 8000 rpm.
Hydraulic holders are suitable for：
Precision part machining, such as aerospace components and medical instruments.
High-speed cutting scenarios, especially applications with speeds exceeding 15000 rpm.
Press fit tool holders require regular inspection of the threaded mechanism, with cleaning and maintenance recommended every 200 hours of use.
Hydraulic holders should have their sealing rings checked for integrity, and the hydraulic oil level and system seal should be inspected every 100 hours.
Both types of tool holders need to be kept clean to prevent damage from chips and coolant. Additionally, if a hydraulic holder leaks oil, check if the sealing ring is damaged and replace it if necessary. Also, ensure the hydraulic pressure is within the specified range, generally recommended to be maintained at 40-50 MPa. Hydraulic holders, with more stable clamping, usually extend the tool life by 20-30% compared to press fit tool holders, reducing replacement frequency accordingly.
Through the above analysis, we can see that hydraulic holders and press fit tool holders have their unique characteristics. When choosing, it is essential to comprehensively consider actual machining needs, budget, and process requirements to achieve the best machining results.
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