The use of rivets is a very common way of connecting various parts. This method has a long history. But now, when many processes are mechanized, many people want to know how the riveter works.
Riveter is a tool that is designed for riveting.
This fairly simple machine allows you to facilitate the installation of rivets. If earlier everything had to be done by simple metal riveting, then it provides a high-quality connection without great effort.
The process of installing rivets with zaklepochnik.
The riveting process is the connection of blanks with the help of an additional element (rivet), which secures them through flattened heads. To implement this principle, a through hole is made in the blanks, where a metal cylindrical twig is inserted with force so that the ends come out on both sides of the joined blanks to the outside. These ends flatten out (forming caps), tightly pressed to the surface of the workpiece. As a result of the fact that additional metal fills the volume of the hole, and its caps, having a size larger than the diameter of the hole, tightly cover the surface area of the blanks around the hole, a one-piece connection is provided on both sides.
With the help of rivets, you can connect two or more parts, and also simply plug the hole in the part if necessary. The connection is quite strong. Even in the case when efforts are applied above the allowable values, the rivet breaks out gradually after a certain metal drawing due to plastic deformation. The strength of the joint depends on the size of the workpiece and the material from which it is made, as well as the size of the cap and hole. The importance of matching the diameters of the hole and rivet, as it must necessarily fill the entire volume of the workpiece.Back to table of contents
Types of rivets
Types of rivets.
In the general case, the rivet is a metal cylinder of different lengths and diameters. There are 2 main types - monolithic (solid) and tubular (caps) riveting. All-metal have the form of a piece of wire or twig. Pistons are tube-shaped, i.e. inside they have a channel not filled with metal. Until recently, solid rivets were considered classic and were the only type of rivets. Now mainly pistons are used, as they allow to mechanize the process. The classic ones are used only for the manual method of flattening the caps.
In turn, the caps are divided into the following types: exhaust and nut riveting. Exhaust have the form of a tube, on one side of which an expanded head is made. A rod (punch) with an extended head at one end is inserted into the internal bore of the cylinder of such a device. The punch is inserted from the side opposite to the head, and after passing through the hole forms a second head.
The scheme of the rivet.
On the inner channel of the nut rivet, a thread is made approximately at half the length of the riveting, intended for the subsequent tightening of a screw (bolt) in it. At the end of the rivets without thread is made an extended head. The area of riveting, where there is no thread, is a deformation zone. To install the wrench rivets, a special type of riveter is used. In addition to the cylindrical shape, specimens with threads can be made in the form of a hexagon.
Rivets vary in the material from which they are made. The most widely used specimens of aluminum or its alloys because of its softness and plasticity. Steel rivets are used for joints with increased strength. The installation of such rivets requires considerable effort to flatten the heads. In some cases, are used rivets made of copper alloys - brass, bronze.Back to table of contents
Features of work zaklepochnik
The main condition for riveting is that when forming the heads, a force must be applied on both sides of the riveting. Riveter can be brought to the details only on one side, so the load on the rivet on the other side is provided by the design of the riveting itself.
Mechanical riveting device.
Riveters are available in several types. They differ in the type of actuator of the working element - mechanical, pneumatic, pneumatic-hydraulic riveters. By the type of riveting used, riveters are divided into devices for rivets and for wrenches. In addition, universal devices and accessories for hex rivets are available. Finally, riveters can be amateur and professional.
In domestic conditions mechanical amateur riveters are usually used. Structurally, they can be divided into devices with one handle, with two sliding handles and the type of "accordion".
The design of the riveter is based on a lever mechanism with a significant ratio of the length of the arms of the levers. A mechanical drive drives the collet, which pulls the riveting element up to the formation of the rivet head.
Zaklepochnik works with exhaust elements by the type of pulling additional rivet wire along the internal channel of the main element. In this case, the force is applied on one side, but is redistributed to both sides of the parts. This is achieved by installing elements (body and punch) from different sides of the metals being joined. The punch is subjected to drawing, and at the same time a significant load is applied to the head of the casing in the opposite direction, which causes the casing to flatten out inside the hole and thereby clamp the punch.
The rivet is installed using a special screw head. During the application of force due to the riveter on both sides of the parts folds are formed, securing the rivet in the hole. The device has a set of heads for rivets of different diameters (3-10 mm).Back to table of contents
Installation of exhaust design
The scheme for calculating the parameters of the hole for rivet.
To join parts by riveting, it is first necessary to drill a through hole through the workpiece to be joined (2 or more). At the edges of the hole chamfer is removed. The diameter of the hole is determined by the required strength of the connection and sets the size of the rivet.
The rivet case is inserted from the more convenient side so that the head rests against the surface of the part. The body should come out on the other side of the hole by 5-10 mm. A punch is inserted on the reverse side and passed through the internal channel of the body until its head rests on the end of the body. The departure of the punch from the side of the housing head should allow it to be clamped into the rivet box. By pressing the handles of the apparatus, the punch is drawn out until its core is completely broken.
If one full pressing of the handle does not lead to a break in the rod, then the handle is retracted and re-pressed, this is done until the rod is completely broken.
The rivet is clamped in the hole.Back to table of contents
Installation of a nut design
The process of installing a wrench rivet.
Preparation of parts is performed in the same way as the case considered - a hole is made with a facet. To join metals with a rivet, a riveter is used, equipped with a special nozzle and a screw element. Wrench riveting is inserted into the hole so that on one side it rested against the workpiece with its head, and on the other it went out 8-10 mm. On the side of the threaded part of the rivet, a screw element of the apparatus is screwed into it with a projection on the opposite side in order to fasten the riveter in the nozzle. The nozzle rests on the head of the riveting. Handles-levers creates an effort to pull the screw element. Due to this effort, the deformation zone is flattened, and on the surface of the part the rivet is flattened out. This ensures the connection of parts.
In the process of riveting parts, you will need the following additional tool:
- electric drill;
In some cases, installing rivets is the only way to connect parts. The mechanization of the riveting process is easy to implement, if you find out how the riveter works. The principle of its operation is very simple and accessible to any person.