Longwin established in May 2006, has been a leading high-precision metal parts manufacturer for 17 years, with extensive OEM and ODM production experience. We specialize in the development and design of precision die-casting parts, CNC machining parts, and automatic lathe turning parts. Our capabilities include producing cylindrical products with diameters ranging from 1mm to 400mm and lengths ranging from 1mm to 1000mm. For non-cylindrical products, the length can range from 0.5mm to 1000mm, width from 0.5mm to 600mm, and height from 0.5mm to 600mm, with an accuracy of up to 0.002mm. In 2015, we developed a high-precision planetary gearbox for our customers. Our products are widely used in automotive controllers, servo motors, encoders, reducers, and robots. With a factory building area of 64,000 square meters, 600 employees, 500 CNC machining equipment, 16 die-casting machines ranging from 160 to 1250 tons, and 30 types of testing and measuring instruments, we are capable of providing you with high-quality precision metal parts, competitive prices, and excellent service.
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CNC machining helical gears are similar to spur gears except that their teeth are cut at an angle to the hole (axis) rather than straight and parallel to the hole like the teeth of a spur gear. The line of contact between two teeth is not parallel to the teeth but inclined.
Benefits of CNC Machining Helical Gear
Helical gears can bear greater loads. As mentioned, helical gears are similar to spur gears but with the gear teeth produced at an angle to the axis of the gear. This allows helical gears to bear more load than spur gears and operate more quietly.
Helical gear sets offer more flexibility compared to standard spur gears. For example, when used in right angles, you can use right-hand or left-hand gears depending on the desired output rotation direction.
Helical gears are more versatile. They can be used in both parallel (in-line) as well as right angle gearbox configurations. They're also produced with the gear tooth helix direction in both right- and left-hand orientations. (Keep in mind, helical gear sets used in parallel must use one right- and one left-hand gear).
Right angle helical gearboxes can have a greater range of gear diameters. This helps helical gearboxes achieve various ratios as well as distance between input/output shafts.
Helical gears offer greater range. When used in parallel, multiple helical gears may be used to offer a wide range of gear ratios and distance between input/output shafts.
Right angle helical gearboxes provide non-intersecting shafts, meaning the input/output shafts are offset from one another on different planes at a distance determined by the gear diameters.
The mechanical advantage, also known as the ratio of output torque to input torque in a system, is the guiding principle behind helical gears. The gear ratio, or the ratio of the last gear's speed to the initial gear's speed in a gear train, determines the mechanical advantage of gears. The law of conservation of energy plays a key role in this relationship for gear trains. This concept can be simplified when analyzing gear trains by examining the system's saved power. In addition, this analysis relates the angular velocities of the gears to their torques.
Special teeth in helical gears are positioned at a specific angle to the shaft and the gear face. When two teeth in a helical gear system make contact, the initial point of touch is at one end of the tooth, and as the gears turn, the contact gradually expands until the two teeth are fully engaged. Since more than one tooth makes contact during the action, the gear can withstand a greater load.
Due to the load-sharing between teeth in this design of gradual engagement, helical gears can operate more quietly and smoothly than spur gears. Because of this, helical gears are utilized in practically all automobile transmissions. In addition, helical gears' bent teeth force them to be staggered, which means they must be stacked in a zigzag pattern or otherwise unaligned. The next gear's teeth are oriented differently from the first gear so they can mesh.
The sliding contact between the teeth brought on by the inclined angle of the teeth also generates axial forces and heat, reducing efficiency. Helical gears' angled teeth cause a thrust load to be placed on the gear when it meshes. Helical gear devices have bearings aiding in rotation that can withstand this thrust force. Inside the equipment, the bearings support the revolving shaft. Helical gears require thrust or roller bearings, often larger and more expensive than the plain bearings used with spur gears since they must endure both radial and axial forces. The size of the tangent to the helix angle determines how the axial forces change. The helix angle is normally limited to 45 degrees because of the generation of axial forces, although bigger helix angles offer better speed and smoother motion.
Why Choose a CNC Machining Helical Gear
Helical gears are cylindrical gears whose teeth are not parallel to the axis of rotation. The teeth are angled and appear as a segment of a helix which makes it transmit power between parallel or right angle axes. The main difference between a helical gearbox and others is that the teeth form a helix and have the potential to run more quietly. Another advantage of using these gears are that they will have more capability to transmit load between two parallel shafts as compared to the similar module and equivalent width of spur gears. And of course, there will be less wear and tear as the load will be distributed between several teeth.
Double helical gear
The forces needed to overcome axial thrust can be neutralized or counteracted by double helical gears. The entire face is divided into two equal parts with opposite hands and the same helix angle. The forces are contained in the gear and are not transferred to the bearing because the axial thrusts oppose one another. Therefore, these gears have the advantages of high loading capacity and reliable transmission. Double helical gears are used frequently for power transmission in gas turbines, generators, prime movers, pumps, fans, and compressors in maritime ships and construction machinery due to their benefits.
Herringbone gear
A herringbone gear is a particular kind of double helical gear. The herringbone gear has two sets of gear teeth-one set on the right hand and one on the left hand-on a single gear. When there are two sets of gear teeth, one set's thrust cancels the other. When visible of the top, each of this gear's spiral grooves resemble the letter V and form a herringbone pattern. As a result of this pattern, herringbone gears do not produce a further axial load.
Helical rack and pinion
A particular kind of linear actuator known as a helical rack and pinion transforms the circular pinion's rotating motion into linear motion at the rack. A rack is just a straight bar with gear teeth, yet it may also be conceptualized as a part of a gear with an infinite radius. Helical racks and pinions are affordable for linear motion with movement lengths greater than 2 meters. They transform rotational motion into linear motion when combined. The rack is driven in a line when the pinion is rotated. On the other hand, if the rack is moved linearly, the pinion will turn.
Screw gear
When engaged, the screw gears exhibit a screw action, or a permanent sliding of the flank, rather than a simple rolling movement. As a result, no points on the reference bodies of crossed helical gears may be attributed to a pure rolling process, and the circumferential speeds of the gears are not identical at any point. Screw gear reference bodies are rotational hyperboloids. A skew straight line is rotated around a rotational axis to produce a hyperboloid. Screw gears are made for moderate speeds and torques, such as those used in machine tool drives.
Helical worm gears
Helical worm gears are cylindrical objects with an external spiral thread that meshes with another gear to turn it. A worm or a screw collides with a gear in this particular gear system. Various industries use worm gears to increase torque and when significant gear reductions are required. Worm gears frequently have reductions of 20:1 and sometimes even 300:1 or more.
Bevel helical gears
Although they can be made to operate at other angles as well, helical bevel gearboxes are angular gearboxes in which the output shaft of the gear unit rotates 90 degrees concerning the motor's rotor shaft. Shafts can be solid or hollow. When a shaft needs to rotate in a different direction, bevel gears come in handy. Applications involving angular geared motors that require high power density and output torque should use gearboxes with helical bevel gears. Bevel helical gearboxes are characterized by curved teeth enclosed within a cone-shaped base at the device's edge. By creating rotating motion between non-parallel shafts, this design achieves a stable and silent operation. As is customary, the spiral teeth mesh with other helical gears. Starting at one end of the gear, the contact gradually increases throughout the length of each tooth.
Suitable materials for helical gears include alloy steels such as carburizing steel, case-hardening steel, or nitriding steel. These materials provide excellent strength, toughness, and wear resistance, ensuring reliable performance even under heavy loads.
Application of CNC Machining Helical Gear
Since helical gears experience less wear and friction than other gears while still having a substantial force-transfer capacity, they are perfect for high-speed applications.
The overlapping of subsequent discharges from intervals between the teeth is increased by the helical gear design over the herringbone arrangement. The discharge flow is thus smoother. As a result, gears with an increased capacity can be made with fewer huge teeth without sacrificing smooth flow.
Centrifugal compressors and turbines are slowed down using helical gears to match the nominal speeds of motors and generators. These gears must be properly cooled and lubricated to function properly.
Automotive helical-type gears are more durable than spur gears because they have more teeth that can mesh together, creating a larger surface area that can support the weight. Due to this, helical-type gears are an excellent choice for heavy-duty automobile applications like transmission operations.
Helical gears' teeth enable axial forces to withstand twisting or spinning motions. Therefore, these gears are advised for use with machinery that needs quicker rotational speed, carries heavy loads of items, or runs continuously.
Gear design and engineering
The manufacturing process begins with gear design and engineering. This includes determining the gear specifications, such as tooth profile, helix angle, pressure angle, and module (or pitch), based on the application requirements. Computer-aided design (CAD) software is commonly used to design the gear geometry and tooth profiles.
Material selection
The choice of material is critical for helical gear manufacturing. Common materials used include alloy steels, carbon steels, or specialized gear steels. The material should possess high strength, good fatigue resistance, and wear resistance. Factors such as load capacity, operating conditions, and desired gear life guide the material selection process.
Gear cutting techniques
The two primary gear cutting techniques used for manufacturing helical gears are:
Hobbing: Hobbing is the most common and efficient method for mass production of helical gears. It involves using a hob, a specialized cutting tool with multiple cutting edges, to gradually cut the helical teeth. The gear blank rotates while the hob moves axially, generating the helical tooth form.
Shaping: Shaping involves using a gear shaping machine, where a cutting tool, known as the shaper cutter, progressively cuts the teeth in a rotational and axial motion. While hobbing is more commonly used, shaping is suitable for small batch production or for gears with larger modules.
Heat treatment
After gear cutting, heat treatment processes are applied to enhance the material's mechanical properties. Typical heat treatment methods include:
Carburizing: Carburizing involves introducing carbon to the surface of the gear through a heating process in a carbon-rich environment. This increases the hardness and wear resistance of the gear teeth.
Quenching and tempering: After carburizing, the gears are quenched to rapidly cool them, followed by tempering to reduce the brittleness and improve the overall toughness and strength of the material.
Finishing operations
Finishing operations are performed to achieve the desired surface finish, accuracy, and noise reduction. These operations may include grinding, honing, or lapping of the gear teeth. Surface treatment processes, such as shot peening or nitriding, may also be applied to improve gear surface hardness, wear resistance, and fatigue strength.
Quality control and inspection
Quality control measures ensure that helical gears meet the required specifications and standards. Common inspection techniques include:
Dimensional inspection: Measurement of critical dimensions, such as tooth profile, pitch diameter, and runout, using coordinate measuring machines (CMMs) or gear measurement instruments.
Surface inspection: Visual or automated inspection of gear surfaces for defects, such as cracks, burrs, or irregularities, using techniques like visual inspection, dye penetrant testing, or magnetic particle inspection.
Hardness testing: Determination of gear hardness using hardness testing methods, such as Rockwell or Brinell hardness testing, to ensure the gear meets the required hardness specifications.
Gear tooth contact pattern analysis: Analysis of the gear tooth contact pattern during meshing to ensure proper gear alignment and load distribution. This can be done through techniques like the checking of tooth contact patterns using special dyes or contact pattern analysis software.
How to Maintain CNC Machining Helical Gear
Inspect helical gears frequently
All gearbox and helical gears require consistent visual inspections to make sure that you don't miss any telltale signs of leaks, paint discolouration, excessive vibrations, and others. These can indicate a call for intensive cleaning or replacements.
Clean daily
Everyday cleaning is essential for helical gears and gearboxes working in environmentally challenging areas that have high dust, dirt, and sand levels. Contaminants can contribute to overall engine heating, misalignment, and gear damage.
Lubricate regularly
A regularly lubricated gearbox can avoid overheating problems. The amount, quality, and type of lubrication are essential to achieve optimal engine performance. Consult with your machine's manufacturer about the most compatible lubricators available.
Observe gear temperature
Helical gears and gearboxes can still overheat with daily cleaning and regular lubrication due to several factors. Hence, always check the equipment's temperature using an infrared gun. Measure the gearbox's performance during its peak activities for optimal observation results.
Note helical gearbox rate
Helical gears can achieve top-notch results if the gearboxes comply with the demands of your operational activities. However, gearboxes deteriorate and their performance decreases over time. Check your machine's helical gearbox rate to make sure it's functioning smoothly.
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Founded in May 2006. It is a high-tech enterprise focusing on R&D, manufacturing and sales of industrial, automation and vehicle core components.
The current processed products cover automation FA, robots, servo motors, encoders, automobiles , medical, high-speed rail and other fields.
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