Four-blade reamer / Tapered reamer
The CR750 Series of high-precision reamers for military firearms is a top-of-the-line product developed by JIAYI Tools specifically for machining core components of military firearms, such as barrel bores and high-precision gas ports. It is manufactured using military-grade, ultra-precision manufacturing processes. Achieving breakthroughs in barrel bore machining with "sub-micron precision, mirror-like surface finish, and service life," thereby completely resolving the pain points associated with traditional reamers in military manufacturing—namely, "insufficient precision, short service life, and poor stability." Provides reliable core machining support for the manufacture of military firearms
| Part number | CR750 Series |
|---|---|
| Type | Carbide Reamers |
| Product name | Tapered Helical Reamers / Four-Flute Reamers |
| Example size | D6.58 × 45L × D10 × 186L |
| Coating | Diamond-like |
| OEM / ODM | Made to your samples or drawings |
| Origin | Shenzhen, China |
Design details that keep reaming stable, accurate and chatter-free.
The cutting edge is ultra-precisely ground using a five-axis CNC grinding machine, with a runout error of ≤0.05 μm, ensuring that the roundness and cylindricity of the barrel bore are maintained within 0.001 mm, thereby meeting the stringent requirements for military firearms.
The front cutting edge features a 12° guide angle to reduce entry-side deformation; the rear cutting edge features a 0.001 mm finishing edge to ensure a chip-free, burr-free exit, thereby preventing any impact on ballistic stability.
The cutter body is machined from a single piece of ultra-fine-grain carbide (HRC 68) with no welded joints, ensuring no loosening or runout during high-speed, high-feed machining, with a repeatability of ≤0.003 mm.
The cutter body is made of WC-Co ultra-fine-grain cemented carbide (HRC 70), which offers 50% greater chip-cracking resistance than standard cemented carbide and can withstand continuous high-intensity machining.
These CVD diamond-like coatings are only 1 μm thick and have a coefficient of friction as low as 0.1. They extend tool life by a factor of 3 compared to traditional TiAlN coatings and eliminate the risk of coating peeling.
The cutter body undergoes cryogenic treatment at -196°C followed by high-temperature tempering to thoroughly eliminate internal stresses, ensuring no deformation or runout during high-speed machining and guaranteeing machining stability.
The tool undergoes G1.0-grade dynamic balancing testing and exhibits no vibration at high speeds of 30,000 rpm; the shank is made of a damping alloy and features built-in micro-damping grooves that absorb more than 95% of cutting vibrations.
Each reamer passes a G2.5-grade dynamic balancing test, ensuring vibration-free operation at high speeds of 20,000 rpm and guaranteeing machining stability.
Starting values. Our engineers can tune parameters to your machine and workpiece.
| Workpiece material | Cutting speed vc (m/min) | Feed f (mm/rev) | Coolant |
|---|---|---|---|
| Barrel Steel | 40–60 | 0.03–0.08 | High-pressure internal + emulsion |
| Stainless Steel | 30–50 | 0.02–0.06 | Internal + MQL |
| Titanium Alloy | 20–40 | 0.01–0.04 | MQL |
Typical bores and industries for this reamer.
Machining φ5–φ12 mm bores in the steel bodies of rifle and sniper rifle barrels, with a roundness of ≤0.001 mm and a surface roughness of Ra ≤0.08 μm, to meet ballistic performance requirements.
Machining φ2–φ8 mm precision holes in aluminum alloy and titanium alloy substrates for military optical instruments and radar equipment to meet accuracy requirements in high-vibration environments.
Machining φ1–φ3 mm gas ports on the stainless steel substrate of a firearm’s gas system, with positional accuracy of ≤0.002 mm, to ensure consistent gas flow efficiency.
Machining high-precision holes ranging from φ4 to φ16 mm in core components of armored vehicles and unmanned aerial vehicles to ensure the reliability and service life of the equipment.
Send your bore size, tolerance and drawing. We manufacture standard sizes and custom reamers made to your samples or drawings.