Solutions to Common Problems of Hollow Rivets

Release time:

2021-11-30

Solutions to common problems of hollow rivets: the use of hollow rivets often encounter some problems. The following is a brief solution to common problems:

Solutions to Common Problems of Hollow Rivets

Problems are often encountered with blind rivets. The following is a brief solution to common problems:

1. The burr is outside the flange due to the pulling of the mandrel

The most common problem of hollow rivets is to select the specific size of the rivet to drill or honing the hole. It is recommended to exceed the nominal size. The mandrel head of the hollow rivet can be braked by the hollow rivet body, just as the hollow rivet is designed but not applied. The correct selection of hollow rivet material is also a very important preventive measure. For assembling austenitic stainless steel rivets on plastic substrates without using supporting washers, this will cause the mandrel head to be pulled through the rivet body, causing the protruding burrs to stay outside the flange of the hollow rivet. When the assembly material is softer than the hollow rivet material, supporting washers should be added for use.

Another reason for pulling is the use of rivets at the minimum rivet shank length. If the length of the rivet rod of the hollow rivet is 0.25~0.375mm, and the application thickness of the actual total material is measured to be 0.125mm, the hollow rivet hair pulling is almost possible, and its riveting length is less than the length range of the rivet rod.

2. After the hollow rivet is assembled, the mandrel head overflows from the hollow side

This kind of problem usually occurs because the thickness of the total material workpiece exceeds the length of the specific rivet shank of the selected rivet. If the maximum length of the rivet is 0.25mm, if the material thickness exceeds 0.25mm, it will not be assembled correctly. If the material thickness exceeds 0.25mm before damage, it is related to the thickness and diameter of the mandrel head. It is recommended to use a rivet with a smaller size to avoid the problem.

3. Improper rivet assembly

After the rivet is assembled, the end of the rivet flange is embedded in the workpiece, and the rivet is accurately pushed into the hole before assembly at the end of the display operation. It is also possible that the hole diameter of the assembly material is too small, and too small hole diameter may cause improper matching size between the flange and the rivet body. Loosen assembly rivets may cause greater pressure with the power tool, which can make the rivet mandrel quickly assembled, causing the mandrel to break at the end, and greater pressure can also cause damage to the power tool. The use of incorrectly sized rivets to assemble materials that are less than the minimum specification for the length of the rivet shank can also cause the rivets to be loosely assembled.

4. Corrosion problems

When different metal materials contact with each other to form electrolyte, electrolytic corrosion may occur. In order to prevent electrolytic corrosion, if possible, when pre-riveting is combined, hollow rivets should use the same metal material. When this solution is unlikely to be realized, paint or cover with other materials to separate the metals.