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Shandong Jining Qingfeng Machinery Hardware Co.,Ltd

Add: NO.47 Jinyu Road, Jining, Shandong

Contact: Qin Wang

Tel: +86-537-3281595

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Is Your Broach Correct?

The collet chuck is called the "teeth" of the machine tool. The tool is a tool used for machining in machining, and it is also called a cutting tool. Most of the knives are machine-based, but they are hand-friendly. Since the tools used in machining are basically used for cutting metal materials, the term "tool" is generally understood as a metal cutting tool. The tool is a consumable item, so you should pay attention to the use and maintenance methods during use, so as to extend the life of the tool and make it more economical. Today, Xiao Bian has come to share a bit about the use and maintenance of broaches.

 


1. When a brand new broach is about to be used, it must be cleaned with rust-proof oil, and check whether the teeth are sharp. If there is a gap or chipping phenomenon, you can use whetstone to go to the bump or at the bump. Open into crumbs. The direction of movement of the stone should be consistent with the direction of movement during operation (ie, the stone moves toward the shank of the broaching tool) and cannot be reciprocated or rotated;

 

2. When broaching the inner surface, the broaching length must not exceed the broach's specified range, otherwise it will cause the broach to chip or break. However, the broaching length should not be too short. It must be ensured that the number of working teeth at the same time when broaching is not less than 3 to make the broaching process smooth;

 

3. Before broaching, the broaching tool holder should be adjusted to be concentric with the workpiece hole. When the gap between the workpiece hole and the leading portion of the broach is large, the workpiece should be moved to the broach tooth with the same hole diameter. Start broaching, otherwise it will cause the hole offset and the risk of broach breaking;

 

4. Before broaching, apply a cutting fluid to rinse or infiltrate the broach, further remove the remaining chips or other dirt attached to the teeth, and lubricate the teeth;

 

5. During the broaching process, the cutting fluid should not only force injection on the teeth, but also have sufficient cooling on the outer surface of the workpiece. When the surface roughness of the workpiece is required to be high, it is recommended to use a high concentration (about 20%). ~25% emulsion ointment, the rest is water emulsion;

 

6, for a long and heavy broach, from the beginning of broaching to about half of the journey, there should be a thimble hole with a thimble center frame against the calibration tooth of the broach, and move along with the broach to eliminate pulling. Knife tail phenomenon, to avoid bending or broken broach. When the broach is lighter, it is generally not necessary to use a center frame to hold the tail of the broach by hand, and the tail swing phenomenon can also be reduced.

 

7. When the calibration tooth of the broach starts to work, the workpiece may fall due to its own weight. The heavier the workpiece, the more severe the fall, which will cause the broach to bend. When the work piece is light, use the hand to hold the work piece; otherwise, place a supporting iron under the work piece in advance, or press the work piece on the brewing baffle with the pressure plate to prevent the work piece from falling;

 

8. In the process of broaching, the surface quality of broaching and the broach wear should be observed frequently. Attention should be paid to grinding. When worn to the allowable limit of wear, it cannot be ground with whetstone but must be ground. When individual blade teeth collapse, broaching must not be performed anymore, because if the previous tooth chipping will multiply the load of the next tooth, causing the latter tooth to continue to chip, or even increase the blade break, it should be The chipping teeth of the chipping edge are rubbed and then the tooth lift is evenly distributed to the other teeth so that the broach can continue to be used;

 

9. After broaching a workpiece, use a copper wire brush to brush the swarf attached to the blade. It is forbidden to use a wire brush or wipe it with a cotton yarn to prevent the fibers of the cotton yarn from catching on the teeth of the knife, and the handle may be scratched. When the copper brush sticking to the tooth on the blade is difficult to remove, it can be wiped off gently with whetstone, but pay attention to keep the original geometry and the front of the blade;

 

10. During the broaching process, attention should always be paid to the change of the pressure gauge on the bed. If it is found that the pointer rises straight, it should be stopped to prevent damage to the broach;


Contact Us
Shandong Jining Qingfeng Machinery Hardware Co.,Ltd

Address: NO.47 Jinyu Road, Jining, Shandong

Tel: +86-537-3281595

Fax: +86-537-3281597

E-mail: info@qfmh.com

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