Quality and Production Control
Quality Control
The ideas that "Quality is made during the process" and "Defects should not be sent to the following process" are the basic principles of the process-based quality control system in Aoyama Seisakusho.
Fool-proof devices placed in every location and reliable eyes of the operator support the quality of Aoyama Seisakusho.
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1Wire drawing
This process is to size wire rods purchased from a steel manufacturer suited for product manufacturing.
We strictly inspect the material of all wire rods.
Spark test
This test checks material components
Tensile test
This test checks material strength
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2Cold forming
This process is to form the head and body of a bolt from a wire rod.
We control the quality using fool-proof devices and every sort of quality check.
Die defect detector
The detector detects a poor shape accompanied by a die defect
Head percussion test
The test checks the strength of the body of the bolt.
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3Thread Rolling
This process is to make threads on the body made during the heading process.
We install a washer for the bolt with the washer.
We maintain quality control similar to that of the heading process.
Washer defect detector
The detector prevents bolts without a washer from being sent to the following process.
Gauge check
We check the accuracy of screws
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4Heat-treatment
This process is to make the bolt have specified strength by quenching and tempering it.
The strength is one of the important properties and we carry out the hardness test for all lots.
Hardness test
The test checks the hardness of the surface and the inside.
Management of
heat-treatment conditionsThe treatment time, furnace atmosphere, and temperature conditions are computer-controlled.
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5Surface treatment
This process is to plate the bolt.
To satisfy the specified anti-rust performance, we define the best plating conditions for each product and control the conditions automatically.
Condition entry using A-PICS Kanban
The system automatically sets treatment conditions via the barcode.
Anticorrosion test
The test evaluates anti-corrosion performance with SST/CCT test
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6Shipping
This process is to ship products to a customer.
To deliver correct products in necessary quantities by the delivery date, we check every box of products.
Automatic warehousing device
This is computer-controlled warehousing
Barcode check
To prevent wrong products, the system automatically collates the customer's Kanban with A-PICS's Kanban.
To customers
all over the world
Reliable products produced under the process-based quality control system in Aoyama Seisakusho
provide safety and reliability for drivers all over the world as a part of the vehicle.
