Four-blade reamer
The CRT430 Series Through-Hole Reamers are a groundbreaking product line developed by JIAYI Tools specifically for high-precision through-hole machining applications. Their innovative "dual-direction cutting edge + chip-breaking groove" design, High surface finish can be achieved on both the entry and exit sides of a hole in a single pass, completely resolving the industry-wide pain points associated with traditional through-hole reamers—namely, "chipping at the exit and difficulty in removing burrs"— Particularly suitable for industries such as automotive, electronics, and mold manufacturing, where there are stringent requirements for through-hole precision and appearance
| Part number | CRT430 Series |
|---|---|
| Type | Brazed Carbide |
| Product name | Deep-hole Reamers/Through-hole Reamers |
| Example size | D19.15 × 28L × D20 × 286L |
| OEM / ODM | Made to your samples or drawings |
| Origin | Shenzhen, China |
Design details that keep reaming stable, accurate and chatter-free.
The front cutting edge features a 15° guide angle to reduce inlet squeezing and deformation; the rear cutting edge features a 0.002 mm mirror-finish edge to ensure the outlet is free of chipping and burrs, with a hole wall surface roughness consistently achieving Ra ≤ 0.15 μm.
Cemented carbide inherently has an extremely low coefficient of friction (0.45), which prevents tool sticking without the need for additional coatings. When machining stainless steel and titanium alloys, chips flow smoothly without sticking, and the hole wall surface finish directly achieves a mirror-like finish of Ra ≤ 0.1 μm.
Features four built-in helical internal cooling channels capable of delivering cooling pressure up to 100 bar. Combined with the extra-large chip trough design, this increases chip evacuation speed by 40% and prevents chips from scratching the bore walls.
Features a 6-flute variable-pitch configuration that disrupts the cutting vibration frequency, completely eliminating chatter marks; the cutting edges feature a 0.003 mm taper to reduce friction with the bore wall, further improving bore wall finish.
Features three built-in helical internal cooling channels with a cooling pressure of up to 120 bar. Combined with a large-capacity chip-discharge groove design, this system increases chip evacuation speed by 50% and prevents chips from scratching the bore walls.
The shaft is made of Invar 36, a low-thermal-expansion alloy with a thermal expansion coefficient of only 1.2×10⁻⁶/°C. During high-speed machining, the shaft’s deformation is ≤0.002 mm, ensuring consistent accuracy in deep-hole machining.
The cutting head and shank are joined via a hot-fit interference fit with a fit tolerance of ≤0.001 mm, ensuring no loosening or runout during high-speed, high-feed machining, with a repeatability of ≤0.003 mm.
It maintains a hardness of over 90% even at 1200°C, enabling high-speed machining at vc = 150–200 m/min, with efficiency more than twice that of carbide reamers.
Starting values. Our engineers can tune parameters to your machine and workpiece.
| Workpiece material | Cutting speed vc (m/min) | Feed f (mm/rev) | Coolant |
|---|---|---|---|
| Aluminum Alloy | 100–150 | 0.1–0.25 | MQL |
| Steel | 60–100 | 0.08–0.2 | Emulsion |
| Stainless Steel | 50–80 | 0.06–0.15 | Internal + MQL |
Typical bores and industries for this reamer.
Machining φ6–φ25 mm locating holes in aluminum alloy or steel base materials such as transmission housings and engine blocks, with a hole surface roughness of Ra ≤ 0.15 μm and no chipping at the hole exit.
Machining φ5–φ20 mm guide pin holes on the platen of injection molds and stamping dies to ensure high-precision mating between guide pins and guide bushings, with a repeatability of ≤0.005 mm.
Machining φ5–φ15 mm deep holes in HRC 55–60 stainless steel landing gear base material, with a depth-to-diameter ratio of up to 10:1 and a roundness tolerance of ≤0.002 mm.
Drilling φ4–φ16 mm fluid passage holes in the steel base material of hydraulic valve blocks to meet the sealing requirements of high-pressure fluid systems.
Send your bore size, tolerance and drawing. We manufacture standard sizes and custom reamers made to your samples or drawings.