常见问题

I. Core Hardware Compatibility
1. Screw Specifications

♢ Type (Phillips/Slotted/Hex/Star, etc.), Dimensions (Diameter, Length, Head Type), Material (Steel/Copper/Stainless Steel), Special Features (with washers, adhesive tails, magnetic, etc.).

♢ Key Points: Determines the type of feeder and compatibility with the fastening head (e.g., custom vibratory feeders are required for non-standard screws).

2. Product Characteristics

♢ Dimensions/Weight: Determine the design of the equipment worktable or fixtures.

♢ Fastening Surface: Flat/Curved/Inclined (affects positioning methods).

♢ Hole Parameters: Number of holes, hole spacing (determines single-head or multi-axis solutions), positional accuracy (±0.1mm requires high-precision models).

II. Production Requirements
1. Efficiency Requirements

♢ Calculate per-piece fastening time (seconds/screw):

Handheld: 3–5 seconds/screw

Multi-axis (4-axis): Fasten 4 screws within 3 seconds

Coordinate-based: 1.5–2 seconds/screw (including movement time).

♢ Production Capacity Matching: Determine equipment cycle time based on daily output (e.g., daily output of 5,000 units → requires a model with ≥6 seconds/unit).

2. Production Flexibility

♢ Single Product: Select a multi-axis machine (fixed-type, turntable-type, or robotic arm-type).

♢ Multiple Varieties, Small Batches: Select a handheld model.

♢ Multiple Varieties and Batches: Select coordinate-based models (10-second program changeover).

III. Technical Parameters
1. Fastening Process Requirements

♢ Torque Range: 0.1–5 N·m (precision electronics) or 20 N·m (heavy industry); requires a servo motor.

♢ Depth Control: Closed-loop control required for ±0.05 mm accuracy.

♢ Detection Functions: Real-time detection of stripped threads, loose fasteners, or missed fasteners (increases cost by 15–30%).

2. Feeding System Selection

Feeding Type    Suitable Scenarios    Drawbacks
Vibratory Feeder    Suitable for irregularly shaped screws and screws >45 mm in length    High noise level; long screws are prone to jamming
Straight-Line Feeder    Suitable for screws with total length less than the nut diameter or screws with washers    Slow feeding speed
Turbo Feeder    Suitable for the vast majority of screws (M0.6–M20)    Jamming caused by foreign objects in the screws

IV. Integration and Cost
1. Production Line Integration Methods

♢ Standalone Workstation: Suitable for new product pilot production.

♢ Assembly Line Integration: Requires reserved communication interfaces (e.g., I/O, Ethernet) and synchronized cycle time.

2. Budget Range

♢ Handheld: ¥0.55 million

♢ Coordinate-based: ¥2.5–6 million

♢ Multi-axis: ¥40,000–120,000

V. Reliability Assurance
1. Brand and Service

♢ Core Component Brands: Servo motors, PLCs (Panasonic/Mitsubishi), solenoid valves/cylinders (Yadek/SMC), relays (Omron), power supplies (Mean Well).

♢ Supplier Capabilities: Whether process validation is provided (free trial locking), and after-sales response time (on-site service within 24 hours).

2. Scalability

♢ Reserved mounting holes: For future product modifications.

♢ Software Upgrades: Support for new features (e.g., real-time torque display, real-time data logging).

Final Step: Provide the supplier with multiple samples and screws for on-site testing to verify:
① Feed stalling rate (<0.1%)
② Fastening pass rate (>99.9%)
③ Stability during 8 consecutive hours of operation.
Only actual test data can mitigate the risk of “inflated specifications”!

What are the feeding methods for automatic screwdriving machines?
Generally, the feeding method for Chisu automatic screwdriving machines refers to how screws are conveyed. The most common feeding methods include:
1. Air-blow feeding
The air-blow feeding method represents a true automatic screw feeder. It automatically delivers sorted and arranged screws into the jaws of the fastening mechanism, where they await installation. Through multi-stage sensor control, this method completely eliminates the need for manual or mechanical back-and-forth retrieval of screws, significantly simplifying the process and saving time. During production, operators only need to continuously locate screw holes (for handheld models) or allow the machine to perform automatic fastening, without having to worry about screw feeding.

2. Suction-Type Screw Feeding
Suction-type screw feeding machines use a screw sorting machine to align the screws. The machine or an operator retrieves the screws back and forth before performing the fastening operation. This method is compact and cost-effective, primarily used for feeding flat and small screws.

3. Vibrating Feeder Screw Feeding
Vibrating feeder screw feeding is a relatively outdated process. It is bulky, noisy, and expensive, and is rarely used today. However, it remains essential for certain specialized screw feeding applications, such as screws longer than 60 mm or larger than M8.

Each of these three methods has its own advantages and plays an irreplaceable role in specific situations.

Automatic screwdriving machines reduce defect rates by over 90% through a three-pronged approach of “precision control + process error prevention + data traceability”:
• Torque consistency: Servo motor + PLC control, with torque error <±1%, eliminating issues of over-tightening or under-tightening caused by variations in manual torque.
• Positioning Accuracy: Fixture positioning combined with a coordinate system ensures sub-millimeter repeatability, preventing screw misalignment.
• Zero Missed Screws: The system automatically detects the fastening status of every screw, triggering an alarm and stopping the machine immediately if a screw is missed or misaligned.
• Data Traceability: Real-time recording of torque and angle data for each screw, supporting batch traceability.
Actual test data shows: The rate of crooked screws and stripped threads has dropped from 5%–10% with manual operation to <0.5%, and the missed fastening rate has dropped from 1%–3% to 0%.

Common Causes of Over-Height Alarms (Screws Not Fully Tightened):

① Improper parameter settings: Insufficient torque from the electric screwdriver, incorrect tightening height/depth settings, or excessive speed causing stripped threads.
② Positioning deviation: Incorrect calibration of hole coordinates or displacement of the fixture/product, preventing the screw from being tightened vertically.
③ Screw issues: Inconsistent dimensions, mismatched models, or defects such as burrs.
④ Hole abnormalities: Residual debris in the hole, poor thread machining (incomplete tapping or skewed threads).
⑤ Bit wear: Aged bits cause slippage and reduce torque transmission efficiency.
⑥ Insufficient air supply: Unstable air pressure affects the stability of the fastening cylinder’s descent.

Which parts of an automatic screwdriver machine are most prone to wear and tear? According to our statistics, they generally include: screwdriver bits, bit clamps, air hoses, connecting rods, and sleeves.

First, screwdriver bits are particularly susceptible to wear and tear.

Screwdriver bits come into direct contact with the screws being fastened. During high-speed tightening, they generate significant torque as they engage with the screw’s Phillips head. Poor-quality screws can also damage the screwdriver bits, such as slipping, overheating, or irregular cross slots. Screwdriver bits are the most frequently replaced consumables in automatic screwdrivers. If a manufacturing facility operates on a two-shift schedule, with the machine running continuously for 23 hours, a new screwdriver bit may need to be replaced every two to three days. Failure to do so can disrupt normal machine operation and lead to low production efficiency.

Second, the bit (clamping jaw) primarily faces wear-and-tear issues.

Among the various components of a screwdriver machine, the bit is used to grip the screw and complete the fastening process, so it wears out much faster than other parts. The primary issue is significant wear on the gap. When the bit wears down to a certain extent, it must be replaced with a new claw to prevent stripped threads or damaged screw heads, which would compromise product quality and appearance. The bits for our proprietary fully automatic screwdriving machines are made from high-hardness raw materials and undergo a series of post-processing steps, including quenching and electroplating, resulting in excellent hardness and a service life of two to three years (depending on the machine’s usage intensity). We operate our own 2,000-square-meter machining center, which allows us to keep bit costs low and offer affordable replacements to meet our customers’ needs.

Third, Air Tubing

Air tubing is used to blow or suck screws, depending on whether the screw feeder uses an air-blow or vacuum-suction method. However, air tubing also has a limited service life. Over time, it can become dirty, and screw residue or metal debris can interfere with screw feeding or even cause blockages, directly affecting the normal operation of the automatic screwdriver. Replace it as needed based on actual conditions.

Fourth, Wear and Tear of Connecting Rods and Sleeves

The connecting rod transmits torque and is a critical component for attaching the screwdriver bit. Daily use causes wear, and prolonged rotation can significantly wear down the connecting rod and sleeve. Therefore, we regularly apply lubricating oil to reduce this wear. Any moving parts should be lubricated with oil or lubricant to reduce wear and tear. Both the connecting rod and sleeve are manufactured using high-quality raw materials, with a typical service life of two to three years. If the clearance becomes excessively worn, it will affect the normal operation of the screwdriver, leading to low production efficiency. Replace them as needed based on actual conditions. Affordable replacement options are available.

Daily: Remove any residual screws and debris from the work surface and feed channels; check that the air supply pressure is normal.
Weekly: Inspect the wear on the electric screwdriver bits; clean the vacuum filter; check that all air hose connections are secure.
Monthly: Lubricate transmission components such as connecting rods and sleeves; check the operational status of all sensors; calibrate the torque of the electric screwdriver.
Quarterly: Conduct a comprehensive inspection of electrical connections; clean dust from inside the equipment; inspect the wear on the feeder’s vibratory bowl.

All core components of Chisu equipment are sourced from leading international brands:
• Servo motors: Panasonic / Mitsubishi
• PLC controllers: Panasonic / Mitsubishi
• Solenoid valves/cylinders: YADEKA / SMC
• Relays: Omron
• Power Supplies: Mean Well (Taiwan)
Key components such as the feeding mechanism and fastening modules are independently developed and manufactured by Chisu, ensuring consistent quality control.

Chisu ensures equipment precision and stability through a dual-pronged approach of technological R&D and quality control systems, delivering outstanding performance particularly in high-precision applications.

Core Technology Support: Servo Drive System: High-precision servo screwdriving models are equipped with branded servo motors (such as Panasonic and Omron), offering torque control accuracy of ±1% and supporting a wide adjustment range from 0.01 N·m to 1000 N·m. They display torque values and tightening times in real time, making them suitable for precision assembly in automotive engines, precision electronic components, and hardware fittings.
3D Coordinate Positioning: Coordinate-based models utilize an X/Y/Z three-axis ball screw + linear rail structure with a positioning accuracy of ±0.02 mm. Screwdriving paths are precisely controlled via PLC programs or 3D guides to eliminate human error.
Stability Design: In-house development of core components: Key parts such as the feeding mechanism and fastening modules are manufactured in-house, while electrical components from imported brands (e.g., Mean Well power supplies from Taiwan, SMC pneumatic components, and Omron relays) are used, extending service life by 3–5 times.
Multi-stage inspection process: Before shipment, the equipment undergoes 12 quality control procedures, including a 72-hour continuous operation test, torque accuracy calibration, and anti-missed-screw detection, to ensure long-term stable operation.
Application Case: An electronic component manufacturer adopted Chisu’s servo screwdriver to meet the fastening requirement of ±1% torque accuracy for electronic assemblies. The defect rate dropped from 5% during manual operation to 0.3%, and production efficiency increased by 200%.