What equipment is used for bolt reaming, and what machine tool is used for reaming

Drilling machine for reaming. The expansion hole needs to be loaded with a boring machine or a boring and milling machine.

Drill press. Refers to a machine tool that mainly uses a drill bit to make holes in the workpiece. Usually the rotation of the drill bit is the main motion, and the axial movement of the drill bit is the feed motion.

In order to process the needs of intersecting or arbitrary angles on some parts, or oblique holes, vertical holes or parallel holes at a certain angle with the center line of the machined parts, various countries have specially developed a variety of special deep hole drilling machines. For example, it is specially designed for processing oil holes in crankshafts, inclined oil holes in connecting rods, parallel holes and multiple radial discharge holes in feed machinery loading dies.

Boring machine is mainly used for machining high-precision holes or finishing multiple holes at one time, and can also be engaged in the processing of other machined surfaces related to hole finishing. Drilling, milling, and cutting can also be carried out with different tools and attachments with higher machining accuracy and surface quality than with drilling machines. Some boring machines also use a digital control system to automate coordinate positioning and machining processes.

Radial drilling machine, or CNC drilling machine can be hungry.

Look at what kind of hole is expanded, and the accuracy of the hole is required.

Reaming holes in bolts? If the reaming hole on the bolt is too large, the cross-sectional area of the bolt will be reduced, which will affect the tensile strength of the bolt. It seems that it can only be scrapped and remade.

Reaming should be reamed with a reaming knife, which can be reamed with a reamer. Among them, reamers are divided into hand reamers and machine reamers.

High-strength bolt holes should not be gas-cut reaming. The diameter of the reamed hole should not exceed multiple the diameter of the bolt.

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When the high-strength bolt can not freely pass through the bolt hole, can it be used to cut the reaming, fastener consultant Yu Wenlong believes that the high-strength bolt can not freely pass through the bolt hole, of course, can not use gas cutting reaming, fastener consultant Yu Wenlong believes that the gas cutting reaming can not be accurately controlled, if the hole is too large, affect the bolt fastening strength, affect the safety performance of the workpiece.

Yu Wenlong, a fastener consultant, believes that it is best to check the relevant information by yourself, and it is always fake on the Internet. The light ones are unqualified in terms of product quality, and the heavy ones will be fined. Of course, fastener consultant Yu Wenlong believes that if you have the strength, ask a fastener consultant to refer to your technology, grasp the direction of enterprise development, positioning products, positioning customers is also a good choice.

In the permissible steel structure, the high-strength bolt holes are indeed not easy to align. The reason is that the hole processing and the deformation of the steel structure are caused. Mainly the former, which can be easily resolved by corrective treatment.

Therefore, in the production and processing, transportation and storage, it is necessary to work carefully in strict accordance with the operation process, strict quality control and inspection. In this way, we can ensure that the components can be installed correctly, the shape and position of the steel structure are correct, and the quality can be effectively guaranteed.

To ensure that the processing and production of the hole must be carried out in strict accordance with the drawings, in accordance with the quality requirements and related operating process standards of the "Code for Acceptance of Construction Quality of Steel Structure Engineering" (GB50205-2001) and "Design, Construction and Acceptance Regulations for High-strength Bolt Connections of Steel Structures" (JGJ82).

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Introduction to Expansion Bolt Technology:

The expansion bolt is installed in the straight hole that has been formed, and the expansion sleeve is extruded to the concrete wall by applying torque, and the anchoring effect of the structural fixing part is realized by the static friction generated by the extrusion.

Introduction to reamed anchor bolt technology:

1. Working principle:

In the straight hole that has been completed, through the bottom reaming of the anchor hole, the mechanical interlock between the concrete cone surface formed after reaming and the anchor bolt cone head and the lock key is used to realize the anchoring of the structural fixing. The anchorage force of the reamed anchor is provided by the shear force of the concrete cone and the anchor cone and the lock key.

2. Classification: Reaming anchors are divided into the following according to the different reaming methods

2 1, pre-reaming mechanical anchor bolt; (Rear expansion mechanical anchor).

A special belling bit is required to pre-reaming the hole (fig. 1).

Fig.1. Schematic diagram of pre-reamed mechanical anchor bolt.

2 2, self-reaming mechanical anchor bolt; (Self-cutting mechanical anchors).

The anchor bolt comes with its own cutter, and the reaming installation is completed at one time (Fig. 2).

Fig.2. Schematic diagram of self-reaming mechanical anchor bolt.

3. The same points between the pre-reaming anchor bolt and the self-reaming anchor bolt:

The principle of pre-reaming anchor bolt and self-reaming anchor bolt is called undercut anchor in English, and its principle is to cut out a hole with a diameter greater than the upper mounting hole at the blind end of the anchor bolt installation hole, and the anchor bolt is fixed in the hole to expand to form a mechanical rock to ensure the safe and reliable fixation of the anchor bolt in the substrate.

4. The difference between pre-reaming anchor bolt and self-reaming anchor bolt:

Although the principle of pre-reaming anchors and self-reaming anchors is the same, there is a big difference in the way in which the holes are reamed at the blind end of the anchor bolt mounting holes. The reaming of the pre-reaming anchor bolt is to use a special reaming drill bit to reaming the hole at the blind end, and the reaming of the self-reaming anchor bolt is to realize the reaming at the blind end and the expansion at the blind end by the blade carried by the self-cutting lock key expansion of the anchor bolt.

5. The difference between reaming mechanical anchors and expansion bolts:

The reaming type mechanical anchor is to cut a hole with a diameter larger than the upper mounting hole at the blind end of the anchor bolt mounting hole, while the expansion bolt does not need it. The reamed mechanical anchor requires that the groove of the lock key shall not exceed the empty groove (as shown in the figure), and if the groove of the lock key exceeds the empty groove, it will produce an expansion effect.

1. The difference in use - the difference between the rear belled bolt bolt and the expansion bolt is that the former acts on the bottom reaming of the anchor hole, and the latter acts on the wall of the anchor hole.

2. Difference in appearance - the rear belled bolt is a mechanical anchor composed of casing, screw, gasket, elastic pad and lock key. The expansion bolt has a ring barrel and a gap on it, and it is necessary to make a hole in the wall when using it. Place the expansion bolt into this hole, and the ring barrel is squeezed open when the bolt is tightened.

3. Difference in anchorage depth - the anchorage depth of the rear belled bolt should be less than 10d; The depth of the expansion bolt is mainly determined according to the concrete strength and the expansion bolt specifications.

4. The difference in the principle of force - the rear bottom bolt allows a smooth screw, and the mechanical lock key force is used to be forced; The expansion bolt is mainly extruded to produce friction and achieve force.