Baoji Dingding titanium | 9m long deep hole processing precision and efficient tool for deep hole drilling of titanium alloy drill pipe

In the precision manufacturing of aerospace structural parts, petroleum machinery cylinder, nuclear power equipment cylinder, etc., the processing of 9m long deep hole is faced with three core problems of "drill pipe deflection, chip removal blockage and fast tool wear". Traditional high-speed steel and cemented carbide drill pipes are prone to the problems of "poor hole wall accuracy and drill pipe fracture". Relying on the advantages of "China Titanium Valley" material and deep hole processing technology, Baoji Dingding titanium has developed TC4, TC11 and TC18 series of 9m long deep hole processing titanium alloy drill pipes, which strictly comply with gb/t 14383 and ISO 5468 standards. Through the process of "integral forging+deep hole honing+internal cooling channel optimization", the straightness of the drill rod is ≤ 0.1mm/m, and the hole processing accuracy is it7. It is perfectly suitable for deep hole drilling machines, gun drilling machines and other equipment, and solves the accuracy and efficiency pain points of 9m deep hole processing.

1、 Core performance advantage: titanium alloy cracking deep hole processing pain point

In view of the characteristics of 9m long deep hole processing such as "large length diameter ratio, concentrated load and difficult heat dissipation", TC4, TC11 and TC18 titanium alloy drill pipes have formed differentiated advantages and achieved a qualitative breakthrough over traditional materials:

TC4 (general precision)

Ti-6Al-4V composition, tensile strength ≥ 960mpa, elastic modulus 110GPa, 9m length straightness ≤ 0.1mm/m; The deflection during drilling is ≤ 0.02mm, which is suitable for 9m deep hole processing of conventional materials such as aluminum alloy and stainless steel, and the weight is reduced by 40% compared with cemented carbide drill pipe.

TC11 (high temperature wear resistant type)

With the addition of ti-6.5al-3.5mo, the temperature resistance is up to 500 ℃, and the performance is stable at 400 ℃ when drilling superalloy; After surface nitriding treatment, the hardness is hrc40, and the wear resistance is 3 times higher than that of TC4, which is suitable for 9m deep hole machining of superalloy.

TC18 (high strength anti fatigue type)

The composition of ti-4.4al-4mo-2sn was optimized, with tensile strength ≥ 1100mpa and fatigue life ≥ 10 ⁵ cycles; The smoothness Ra of the internal cooling channel is ≤ 0.4 μ m, the chip removal efficiency is increased by 25%, which is suitable for 9m deep hole processing of high-strength steel to avoid drill pipe fracture.

Common advantages

The whole seamless forming has no hidden danger of welds, and the internal cooling channel is accurately positioned (deviation ≤ 0.1mm); The density is only 4.51g/cm ³, reducing the machine load; It is resistant to cutting fluid corrosion and its service life is 3-5 times longer than that of traditional drill pipe.

2、 Precise specification system: suitable for the whole scene processing requirements of 9m deep hole

According to the processing material (conventional steel/superalloy/high strength steel), hole diameter specification and machine tool type, the parameters of 9m long titanium alloy drill pipe are customized, covering the processing range of φ 10mm- φ 100mm holes:

3、 Core application scenario: precise adaptation of 9m long deep hole processing

1. petroleum machinery field: efficient drilling of 9m deep hole of cylinder block

The 9m deep hole of the oil drilling cylinder requires high precision and low deflection, and the titanium alloy drill pipe realizes efficient processing:

-TC4 titanium alloy drill pipe (φ 25mm) is used for processing 9m deep holes in the cylinder body of petroleum machinery. Its straightness is ≤ 0.1mm/m. After drilling, the hole diameter tolerance is controlled at ± 0.01mm, and the hole wall roughness Ra is ≤ 1.6 μ m, which is 20% higher than that of cemented carbide drill pipe. A single drill pipe can process 500 deep holes in the cylinder body, and its life is extended by 3 times;

-The optimized design of the internal cooling channel increased the cutting fluid flow by 30%, and the chip removal was smooth. The hole wall scratch caused by chip blockage was avoided, and the product qualification rate was increased from 92% to 99.5%.

2. aerospace field: 9m deep hole machining of Superalloy casing

The machining of 9m deep hole of superalloy for Aeroengine casing is difficult, and the adaptability of TC11 drill pipe is outstanding:

-TC11 titanium alloy drill pipe (φ 20mm) is used for 9m deep hole processing of high temperature alloy casing. Its hardness maintains hrc30 at 400 ℃ drilling temperature, and the drilling efficiency reaches 50mm/min, which is 5 times higher than that of high speed steel drill pipe;

-The straightness of 9m length is ≤ 0.1mm/m, and the hole perpendicularity error is ≤ 0.02mm/m, which meets the stringent accuracy requirements of aviation components, and has been applied to COMAC C919 parts processing.

3. nuclear power equipment field: stable processing of 9m deep hole of cylinder

The 9m deep hole of stainless steel in the barrel of nuclear power equipment requires wear resistance and long service life, and the nitriding TC4 drill pipe meets the requirements:

-Nitrided TC4 drill pipe (φ 50mm) is used for 9m deep hole processing of nuclear torch body. The surface hardness is HRC35, and the wear rate is reduced by 60% when drilling stainless steel. A single drill pipe can process 300 deep holes of the barrel, which is 2 times longer than that of uncoated drill pipe;

-The diameter of the inner cooling hole is φ 12mm, and the cutting fluid fully cools the cutter head to avoid the sticking problem during stainless steel processing. The hole wall finish is improved to RA ≤ 1.2 μ m, reducing the subsequent polishing process and reducing the processing cost by 15%.

4. engineering machinery: 9m deep hole machining of high strength steel crankshaft

Construction machinery crankshaft high strength steel 9m deep hole processing load is large, and TC18 drill pipe has strong fatigue resistance:

-TC18 titanium alloy drill pipe (φ 80mm) is used for 9m deep hole processing of high-strength steel crankshaft, with tensile strength ≥ 1100mpa, torsional strength ≥ 900MPa, and no deformation under 120N · m drilling torque, avoiding the fracture risk of traditional drill pipe;

-Fatigue life ≥ 10 ⁵ cycles, meeting the continuous processing requirements of the production line, the qualified rate of crankshaft deep hole processing has increased from 88% to 99.2%, and has served Sany Heavy Industry, XCMG machinery and other enterprises.

4、 Whole process quality assurance: precision and life control of 9m long drill pipe

1. precise control of raw materials: high purity sponge titanium ≥ 99.8% is used. The content of Al (4.4%-5.7%) and Mo (4%-5.5%) is strictly controlled by TC18. Each batch of raw materials is attached with an ICP-MS composition report to ensure stable mechanical properties;

2. special process for deep hole: 9m long drill pipe adopts "integral forging+multi pass drawing" process to improve the density of material; The special deep hole honing machine is used to process the inner cooling channel, and the surface roughness Ra ≤ 0.4 μ m; Five axis straightening machine ensures straightness ≤ 0.1mm/m to avoid processing deflection;

3. all accuracy tests: all passed the 9m length straightness test (laser interferometer), internal cooling channel flow test, blade accuracy test (coordinate measuring instrument), and mechanical property test (tensile/torsional test); Each drill pipe is attached with a machining accuracy report;

4. customized strengthening treatment: provide coating (tialn/ticn), nitriding, high temperature stabilization and other strengthening services according to the processing materials to improve the wear resistance and fatigue resistance of drill pipes; Special packaging (anti bending support) is provided to ensure that the accuracy is not damaged during transportation.

Baoji Dingding titanium: the core supplier of 9m long deep hole processing drill pipe

The company is located in Baoji high tech Zone, the "China Titanium Valley". It has 3 special production lines for 9m long deep hole titanium alloy drill pipes, with an annual production capacity of 10000. It has passed ISO9001 quality management system, aerospace AS9100 certification and API 7-1 certification for petroleum machinery. With the core ability of "deep hole accuracy control+titanium alloy material optimization", the products serve leading enterprises such as COMAC, Sany Heavy Industry and CNOOC, and become the preferred partner in the field of 9m long deep hole processing.

Technical core: 9m long drill pipe straightening and internal cooling channel optimization

Complete qualifications: ISO9001, AS9100, API 7-1

Service advantages: customized scheme+on-site processing guidance

Scheme consultation: send the material and aperture parameters of machined parts to 530975155@qq.com Free access to 9m deep hole processing adaptation scheme