I. Introduction to Rivetless Joining Dies

1. RR Stamping Point Joining is the core of the sheet metal stamping joining technology system. It uses a simple circular male die, pressed into the corresponding female die by a ZHOTE pneumatic-hydraulic cylinder press. Under further pressure, the sheet material on the male die side squeezes the sheet material on the female die side, causing it to "flow" and deform within the female die, resulting in a seamless, burr-free ZHOTE corrosion-resistant joint. For sheets with painted or galvanized coatings, the paint or coating "flows" and deforms during the joining process without being damaged, thus ensuring the joint does not affect the corrosion resistance of the sheet surface.

2. ZHOTE Stamping Joining Dies are manufactured using state-of-the-art manufacturing and coating processes, ensuring an extremely long service life and the highest quality stamped joints.

II. Double-Point Joining Dies

Compared to single-joining methods such as welding and riveting, ZOT double-point sheet metal joining technology offers an alternative joining method. In many cases, it can even replace bending and bolting. ZOT Dual-Point Joining is similar to ZOT Point Joining, yet differs in that it offers more possibilities for joining sheet metal. This innovative two-in-one joining method uses a single set of dies (male and female) to create two joints simultaneously. The primary advantages of this joining technology are increased productivity and the prevention of joint rotation. See below for more advantages.

III. Innovative ZOT Duplex Joining

1. The limitations of ZOT Point Joining have been addressed. The dual-point design concept, whereby a single set of dies forms the joint in a single operation, enables the joining of small components or narrow flange edges. Compared to the basic ZOT Point Joining, the dual-point joining die opens up the possibility of joining even tiny components.

2. The shear strength of the dual-point ZOT Joining is nearly twice that of the single-point ZOT Joining, and its tensile strength is 1.5 times greater than that of the single-point ZOT Joining. The close connection between the two joints reduces the tensile stress that can occur at the straight joint of longer workpieces.

3. The ZOT Dual-Point Joining prevents sheet metal rotation. The load-bearing capacity of each joint is the same on both sides, regardless of the die layout.

IV. Load-bearing Capacity

Q: Why is the connection strength almost twice that of a single point connection, even though the two connection points are so close together?

A: Because the distribution of the connection points (along or across the connection points) has little effect on the connection strength. Especially in soft materials, the ZOT two-point connection is significantly stronger than a single-point connection. As production increases, the rotational resistance and connection strength of the connection point also increase. This is independent of the direction of the force. Reducing tensile stress is the primary advantage of the ZOT two-point connection. A ZOT two-point connection is equivalent to two standard point connections. This means the distance between the two connection points is equal to the point diameter, without any loss in performance.

V. Applications of Rivetless Joining Dies

1. Automotive Manufacturing

Used for joining components such as bumpers, exhaust pipes, engine hoods, doors, instrument panels, and brake covers, especially for non-load-bearing parts such as doors and trunk lids.

2. Home Appliances

Used for assembling components such as washing machine housings, refrigerator doors, and air conditioner outer casings, as seen in products from brands like Little Swan and Midea. ‌2

3. Industrial Equipment

Suitable for fastening metal structures such as chassis and cabinets, elevator platforms, and bus ducts. ‌1

4. Electronic Products

Used for securing precision components such as computer housings and copier chassis. ‌1

This technology offers advantages such as strong surface coating compatibility (connection without pretreatment), low energy consumption, and environmental friendliness. However, caution should be exercised when using materials with significantly different thicknesses.