Riveting

Rivets are to connect two or more segments to each other. At first create a hole on segments and then put the rivet into the hole and use riveting machine to tighten the rivet. If you had any problem, try another rivet.

As the expenses of riveting in high quantity are too much, pay enough attention to select rivets to avoid problems and reduce expenses. Following subject is for those costumers who use too many rivets.

1- Selecting rivet:

An appropriate rivet should be selected for a correct riveting. Regard following items to select an appropriate rivet:

  1-1-   Selecting Quality and Diameter of Rivet:

The quality and diameter of rivet are important factors to have a tight connection. Select required rivet for your segments according to the table of quality and resistance of rivets.

1-2-   Distance between Two Rivets:

At first identify quality and diameter of rivets, then specify tension and cut resistances and then specify necessary distance between two rivets.

1-3-   Length of Rivet:

The length of rivet is equal with the diameter of rivet plus thickness of segments. For example the 4*10 rivet is suitable to rivet segments with 6 mm of thickness.

L=D+S

Note:

Selecting Long Rivet is not Useful:

The short rivet causes unstable connection but long rivet causes following problems:

2-Defining Diameter of Hole:

Diameter of hole is one of the most important factors in riveting. Small diameter avoids rivet to be entered and big diameter decreases the strength of connection and may disconnect segments.

The diameter of hole should be a little more than the diameter of rivet (about 0.1 mm). in this case the rivet enters into the hole easily. The increase of diameter of the body of rivet while riveting, produces more friction and makes the connection tighter.

Note:

We recommend that using drills with 3, 4, 5 or 6 mm of diameter are suitable for rivets number 3, 4, 5 or 6 because the real diameter of rivets of Parch Saz Co. is about 0.1 to 0.2 mm less than the diameter of their named diameter. This difference is enough to make a tight connection.

3- Riveting:

Riveting is possible after piercing the segments and defining appropriate rivet. The rivet should be placed into the hole and riveting is possible with riveting machine. Pay attention to following details for more accuracy in the work:

3-1- The nipple of riveting machine should be proper with the nail of rivet. The hole of nipple should be a little bigger than the nail to take it easily (about 0.1 mm more). For this reason there are various nipples for rivets with number 1, 2, 3, 4, 5 and 6. Usually some of these nipples are placed on the body of riveting machine.

3-2- Hold riveting machine vertically on the surface of segments and press the nipple completely on the higher segment.

3-3- Press the segments with hand or clip or any probable way and they try riveting.

3-4- If you had any problem in the number of rivets or your riveting machine did not take the nail, change the nipple and rearrange the riveting machine.

4-Segments:

The quality of rivet and segments is very important to make a tight connection. Generally it is better that rivet and segment be of the same quality. Following points are important in this matter:

4-1- At least two rivets:

If you are going to connect two or more segments and desire to have a tight connection, at least use two rivets because one rivet is not able to avoid rotation of segments.

4-2- Connection of non-metal segments:

Aluminum rivet is suitable to connect two metal segments but is not appropriate to connect one metal segment and another soft segment. In this case, following points should be regarded:

4-2-1- The softer segment should be placed on the harder segment. If the rivet is inserted into the segment, the flat-head nail should be used. These rivets are suitable for school chairs in which wood and profile are connected on the metal.

4-2-2- If the lower segment is softer, use a washer to avoid the rivet to be inserted into the segments.

4-2-3- The thin metal sheets at the back of segments are not able to avoid rivets from being inserted into the softer segment. So it is recommended to use such these sheets with more than 1 mm of thickness or use suitable washers.

4-3- Connection of Plastic Segments:

Most of the plastic segments may be broken while riveting because rivets are stronger than plastic. In such these cases, try to use weaker rivets or aluminum rivets or nails.

4-4- Copper sheets and rivets:

Try copper rivets to connect copper sheets in decoration. Colored aluminum rivets are not proper.

4-5- Scattered rivets for foams:

If the lower segment is made of foam or other soft materials and you need very strong connection, use scattered rivets.

This kind of rivet spreads the pressure of rivet on the surface and avoids any destruction on soft parts.

4-6- Stainless Rivet (Aluminum rivet):

Aluminum rivets do not stain in moisture but their steel nails stain and make an unpleasant color and view, especially in some cases such as refrigerators that health care is very important. We suggest to use aluminum-aluminum rivets in which the body and nail are made of aluminum.

Problems:

Some other problems may occur while riveting incorrectly such as:

1-Prolapsus of  nail:

If the hole is so big or if the lower segment is weak or if the nipple is bigger than the nail, the riveting may be incorrect and the rest of nail comes out.

2-Weak connection:

Using improper rivet causes weak connection. Following items may be the reason of such this case and should be solved:

2-1- If the rivet is very longer than the thickness of segments, the nail will be cut before tightening rivet so the rivet will be loose.

2-2- If the rivet is broken or its nail is cut before a complete connection, the rivet should be changed.

2-3- Sometimes the shaving of hole tears the rivet. In these cases, the segments should be polished and cleaned and the drill should be changed to make clean holes.

3-When the Head of Rivet is Cut:

When the head of rivet is cut, connection fails. One of the reasons may be selecting improper rivet that has not enough strength for this connection and may the thickness of the head of rivet is not enough. To remove the problem another rivet should be selected anyway.

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