Jinan Nake Industry and Trade Co., Ltd.

Jinan Nake Industry and Trade Co., Ltd. supplies Nake brand ultra-high hardness broaches all year round.
The broaches sold by Jinan Nake are 100% genuine, with good quality and low price. Welcome your patronage! ! !
< . Definition of broach
. Type and type broaches are specially used for impact sample notch broaching. The one-time broaching and forming operation of the sample notch is simple and reliable. The broaches are precision-machined using special materials and special processes to have high hardness, good wear resistance and long service life. The processed notches or notches meet the requirements of domestic and foreign standards such as "Charpy Notch Impact Test Method for Metal Materials" and "Metal Materials Charpy Notch Impact Test Method". Any two types of type, type, and type notched broaches can be configured according to user requirements. It is a necessary special equipment for physical and chemical laboratories in metallurgy, machinery manufacturing, boilers and pressure vessels, vehicles and ships, engineering and scientific research departments.
< . Classification of broaches
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2. Notched broaches for type impact specimens, cryogenic baths, impact testing machines
3. Notch broaches for type impact specimens , low temperature tank, impact testing machine
Surface defects
Common defects on the broached surface during the broaching process include the following:
Scratches
The roughness of the machined surface basically meets the requirements. However, when there are local scratch defects, inspection should mainly be carried out from the aspect of use. For example, whether there are bruised and chipped edges on the blade teeth, whether there are chips attached to the blade teeth (especially precision cutting teeth) that have not been cleaned, and whether the shape of the chip flute after repeated sharpening of the broach has resulted in an uneven step shape. The chips will not curl smoothly and may be damaged. Knife teeth and scratched machined surfaces, etc. In addition, if there is oxide scale on the surface of the pre-machined hole, it may damage the blade teeth and cause local scratch defects.
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Squeeze spots
It is caused by the severe extrusion friction between the tool flank surface and the machined surface. It is common to choose the appropriate relief angle (especially the relief angle of rough cutting teeth should not be too small) and tooth lift, use cutting fluid with good performance and sufficient pouring, and perform appropriate heat treatment on workpieces with high hardness to reduce their hardness. to eliminate this defect. Some other defects will also appear on the surface after broaching.
Annular corrugation
The main reason is that the cutting force changes greatly during the broaching process, which causes the broach to work unevenly, causing the cutter teeth to cut unevenly in the circumferential direction. In order to eliminate this defect, from the design aspect, we mainly check whether the selection of the tooth lift is reasonable, whether the number of working teeth is too few, whether the blade width is uniform and too small, etc. Especially, we should focus on checking the machining accuracy of the first seven or eight teeth of the calibration part. From the perspective of use, the broaching speed should not be too high. The accuracy and stiffness of the broaching machine should be good so that no vibration occurs. Whether the bending and radial runout of the broaching tool are out of tolerance.
>Manufacturer address: Luoerzhuang Industrial Park, Dangjia Street Office, Shizhong District, Jinan City