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| Surface Finishing: | Zinc Plated |
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Our Services Process
1.Quotation: Normally, your inquiry can be quoted within 6 hours as long as we confirm your drawing (IGS, STEP, STL, PDF, DWG etc)and information (Material, Tolerance, Surface Treatment and QTY).
1. Metal machining parts strictly according to customer's drawing, packing and quality request;
2. Tolerance: Can be kept in +/-0.01mm;
3. The most advanced CMM inspector to ensure the quality;
4. Experienced technology engineers and well trained workers;
5. Fast and timely delivery. Speedily&professional service;
6. Give customer professional suggestion while in the process of customer designing to save;
7. Customers can use online payment platform to pay a small amount of sample fee to shorten the sample production time;
8. Quality assurance in accordance with ISO9001;
| Material | 1) Aluminum: AL 6061-T6, 6063, 7075-T etc. |
| 2) Stainless steel: 303, 304, 316L, 17-4(SUS630) etc. | |
| 3) Steel: 4140, Q235, Q345B, 20#, 45# etc. | |
| 4) Titanium: TA1, TA2/GR2, TA4/GR5, TC4, TC18 etc. | |
| 5) Brass: C36000 (HPb62), C37700 (HPb59), C26800 (H68), C22000(H90) etc. | |
| 6) Copper, Bronze, Magnesium alloy, Delrin, POM, Acrylic, PC, etc. | |
| Surface Treatment | Galvanized (zinc-plated, nickel-plated, chrome-plated, silver-plated), powder coating/oil painting, polishing (mirror polishing, electrolytic polishing),brushing, sand blasting, hot-dip galvanized. |
| Processing Craft | Engineer drawings-CNC Machining-CNC Turning-Grinding-Inspection-Package |
| Tolerance | +/-0.01mm or special requirements |
| Package | PE Bag, Paper carton box, plywood case/pallet/crate |
| Application | Auto parts, electronic products, power supply, industry cabinet, construction etc |
| Quality Control | ISO9001 |
| Drawing File Format | Solid works, Pro/E, Auto CAD, PDF |
| Features | Customized Design Sample Order Accepted Short Delivery time Competitive Prices Long time quality Insurance Professional after-sale services |
| Inspection | 1.Foundry in-house: 100% inspection on critical dimension; 100% on appearance. 2.Third Party inspection available upon requirement |
| Mainly Testing Facility | Three-dimensional measuring instrument(CMM),Salt spray test box,Dynamic balance detector, Pneumatic detection |
| Application | Medical,auto parts,Used widely |
| Delivery time | 15-20days |
| Quality Insurance | One Year |
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Equipments |
CNC turning, Auto-Lathes, CNC Machining Center, Stamping Machines, CNC spring machining, cnc cuting machine, welding machine, Hydraulic press, stone polishing machine, auto-milling machine, Driling Machines, Heading Machines, Slotting Machines,Tapping Machines, Chamfering Machines, Grinder Machines,Polishing Machine and so on |
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Testing Equipments: |
3D measuring machine, Height Gage, Coordinate Measuring Machine, Hardness Tester, Video Measuring Machine, Roughness Tester, Torsion Tester, Salt Spray Tester,Slide caliper, Micrometer. |
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Material: |
Titanium alloy, Brass, Bronze, Copper, Aluminum, Mild Steel, Stainless Steel, A366, Alloy, Carbon steel, ABS, PCand so on. |
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Surface Treatment: |
Zinc Plating, Nickel Plating,Chrome Plating,Passivation,Hardening, High Frequency, Black Anodizing,Black Oxide Coating,Degreasing,Brushing, Electronic polishing, Powder coating, Gold plating,Etc |
A crank pin is a type of pin used in mechanical systems, typically in internal combustion engines, to connect the crankshaft to the connecting rods. The crank pin allows the rotation of the crankshaft to be transferred into the reciprocating motion of the connecting rods, which is essential in the operation of an engine.
Crank pins are most commonly used in engines and machinery where rotary motion needs to be converted to reciprocating motion, such as:
Internal combustion engines (car, truck, and motorcycle engines)
Steam engines
Compressors and pumps
Marine engines
Heavy machinery
They are an essential part of crankshaft assemblies, particularly in engines with reciprocating pistons.
The primary function of a crank pin is to act as the pivot point where the connecting rod attaches to the crankshaft. This pin allows the connecting rod to pivot as the crankshaft rotates, converting the rotary motion of the crankshaft into the reciprocating motion of the piston, which is critical for engine operation.
Crank pins need to be extremely durable and resistant to wear, as they operate under high stress and rotational forces. Therefore, crank pins are typically made from:
Steel: High-strength steel alloys, such as forged steel, are commonly used due to their ability to withstand high pressures and rotational forces.
Stainless Steel: Used when corrosion resistance is required, particularly in marine or industrial applications.
Chrome-molybdenum Steel: Often used for its strength and resistance to wear, especially in high-performance or racing engines.
Cast Iron: In some cases, especially in older or less demanding applications.
While both a crank pin and a regular pin may serve to connect parts in a mechanical system, the crank pin is specifically designed for use in rotating machinery and must handle high forces, rotational motion, and wear. A regular pin may be used in less demanding applications and is not necessarily subject to the same stresses and operating conditions as a crank pin.
The size, strength, and material properties of a crank pin are also more specialized compared to a standard pin, designed for longevity and performance in engine systems.
Crank pins come in a variety of shapes and designs, depending on the engine or machinery in which they are used:
Fixed Crank Pins: These crank pins are rigidly fixed into the crankshaft and do not rotate. The connecting rod rotates around the pin as the crankshaft turns.
Rotating Crank Pins: In some systems, the crank pin itself may rotate within the crankshaft, although this design is less common in modern engines.
Split Crank Pins: These have a split design that allows for easier assembly and disassembly, often found in larger industrial engines.
Crank pins are typically pressed or forged into the crankshaft. They may also be inserted into a hole in the crankshaft and secured with fasteners like locking nuts or snap rings. The pin is usually secured in place using a key or other fasteners that prevent it from moving or coming loose during operation.
A crankshaft journal is the part of the crankshaft that rides in the bearings of the engine, while a crank pin is a small section that connects the crankshaft to the connecting rod. Both the crank pin and the journal are essential components of the crankshaft assembly, but they serve different functions:
Crank Pin: Connects the crankshaft to the connecting rod and transfers rotational force to create linear motion in the piston.
Crankshaft Journal: Supports the crankshaft in the engine block and provides a smooth surface for the crankshaft bearings to rotate.
The connecting rod connects the piston to the crankshaft and is the part that converts the reciprocating motion of the piston into the rotary motion of the crankshaft. The connecting rod is attached to the crank pin, which acts as a pivot point. As the crankshaft rotates, the crank pin causes the connecting rod to move back and forth, driving the piston.
Proper maintenance of crank pins is essential for the longevity of the engine. Some common maintenance practices include:
Lubrication: Ensuring the crank pin is properly lubricated helps reduce wear and friction, extending its life.
Inspection: Regularly inspecting the crank pin for signs of wear, cracking, or pitting can help detect problems early before they lead to a failure.
Replacement: If a crank pin shows signs of excessive wear or damage, it should be replaced. Crank pins are often press-fit or integral with the crankshaft, so they may need to be replaced as part of the crankshaft assembly.
Crank pin wear is often caused by a combination of factors:
Inadequate lubrication: Without sufficient lubrication, friction increases, leading to faster wear.
Overloading: Excessive load or pressure on the crank pin can lead to accelerated wear.
Contaminants: Dirt, dust, or other particles in the engine oil can increase wear on the crank pin.
Improper clearance: If the clearance between the crank pin and the connecting rod is too tight or too loose, it can cause uneven wear.
Crank pin bearing wear refers to the degradation of the bearing material that supports the crank pin. Over time, the bearing surface can become worn down due to friction and lack of lubrication. This wear can cause the crank pin to become misaligned, leading to inefficient operation, increased friction, and, in some cases, engine failure. Regular maintenance and ensuring proper lubrication are key to preventing crank pin bearing wear.
If a crank pin fails, the connecting rod can detach from the crankshaft, causing a loss of power and potential engine failure. This can lead to significant damage to the engine, as the connecting rod and piston may collide with other engine components. In severe cases, it can cause catastrophic engine damage. Early detection of wear and replacement of damaged crank pins can help avoid such failures.
In some cases, crank pins can be reconditioned or repaired if they show signs of wear but have not yet become damaged to the point of failure. This process may involve grinding the pin or refurbishing the surface. However, if the crank pin is excessively worn, cracked, or damaged, it typically needs to be replaced.
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