Manual grinding of high speed steel drill bits

The edge is placed flat against the grinding wheel surface

This is the first step in the bit’s position relative to the grinding wheel. Some inexperienced operators lean on the grinding wheel and start sharpening the edge before they even straighten it out. This must not wear well. The “edge” here is the main cutting edge. “Leveling” means that the main cutting edge of the sharpened part is in a horizontal position. “Wheel surface” refers to the surface of the grinding wheel, “against” is slowly close to the meaning. At this point, the drill bit cannot touch the grinding wheel;

Oblique drill shaft repair sharp Angle

Here refers to the axis of the bit line and the location of the relationship between grinding wheel surface, “Sharp Angle” is the half of the point Angle 118 ° ± 2 ° , it’s about 60 °. This position is very important, which directly affects the size of the point Angle of the drill bit, the shape of the major cutting lip and the chisel edge Angle. Do not neglect to lay down the bevel Angle in order to lay down the cutting edge, or to lay down the axis in order to lay down the cutting lip. These errors are common in practice. At this point, the drill bit is ready to contact the grinding wheel in the correct position;

From the edge to the back of the grinding

This refers to the grinding of the bit’s edge slowly along the entire back surface, starting from the edge of the bit. This facilitates heat dissipation and sharpening. At this point, the bit can gently contact the grinding wheel for a small amount of edge grinding. When grinding the edge, observe the uniformity of spark, adjust the hand pressure in time, and pay attention to the cooling of the drill bit. When the edge grinding starts again after cooling, continue to set the position.

www.drillbitgrinder.com The Universal Tool Grinder is offered by Purros Machinery Co., Ltd., a professional OEM/ODM tool grinder manufacturer and supplier, End Mill Grinder, Twist Drill Grinder, Lathe Cutter Grinder, Carving Tool Grinder, Drill Sharpener, Universal Grinder, etc.

The Universal Tool Grinder is offered by Purros Machinery Co., Ltd., a professional OEM/ODM tool grinder manufacturer and supplier, End Mill Grinder, Twist Drill Grinder, Lathe Cutter Grinder, Carving Tool Grinder, Drill Sharpener, Universal Grinder, etc.

Manual grinding of high speed steel bit is subject to human factors. Manual grinding will result in a large error of the drill bit due to the difference between human experience and personal intuition. But machine repair and grinding completely avoid this problem. Drill bit grinding machine is more accurate, and the error is small, the human factors are relatively small. Operators do not need to go through professional drill grinding training can be on duty. The operation of the drill bit grinding machine is very simple and the efficiency of the drill bit grinder is very high. Therefore, now many companies that use drill bits choose to buy a drill bit grinding machine to repair the damaged drill bits, which saves a lot of cost. Our tool grinding machines are of very good quality and have been well received by our customers in the market. Welcome to inquire purchase.

What are the differences between machining center and drilling & tapping center?

Now with the vigorous development of industrial manufacturing industry, various industries are using machining center equipment in abrasive tool processing. Many customers still know machining center better. When someone says drilling and tapping center, many people are not clear. Today, let’s talk about the similarities and differences between machining center and drilling & tapping center.

Same points

Machining center and drilling and tapping center, literally, have the word “center”. It can be seen that they are both metal cutting machine tools and CNC processing equipment. In terms of style and function, machining center and drilling and tapping center are very similar.

Difference

Application: Machining center is widely used, mainly for processing plane, surface and other shapes of equipment. Drilling and tapping centers are mainly used for drilling and tapping. Machining center can be used for milling, but machining center can only do slight milling, because the power of drilling and tapping center spindle is not very large, it can not carry out heavy milling.
Shape: drilling and tapping center is smaller than machining center in shape.
Tool library selection: machining center is mainly a hat-type tool library and a disc-type tool library, while drilling and tapping center is mainly a turret-type tool library and a turret-type tool library.
Fast moving speed: drilling and tapping center adopts linear guide rail, which is faster than machining center. The machine tool processing efficiency is obvious.
Price: As far as machinery is concerned, the price of machining center is higher than that of drilling and tapping center.

PURROS Multiaspect Special Purpose Machine

Many machinery plants choose to use drilling and tapping centers. Both drilling and tapping centers and machining centers can cause tool damage and wear. In some cases the tool has not been completely damaged, many can be used after repaired with the drill bit grinding machine. For example, worn bits can be repaired with a drill bit sharpener for more than 90% of worn bits. The repaired bit can be reused. We produce a variety of tool grinding machines, you can choose the right tool grinding machine according to your needs to complete the repair work.

Geometric angle of cutting tool

Choosing the appropriate geometric angle of the tool can help reduce the vibration of the tool, and in turn, the workpiece is not easy to collapse.

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1. Land angle

With the decrease of the absolute value of negative land angle, the wear area of the rear tool surface has little change, but the overall trend is decreasing. With the increase of the rake angle, the strength of the tool edge is weakened, which leads to the decrease of the wear area. The flank wear is aggravated. When negative land angle machining is used, the cutting resistance is large and the cutting vibration is increased. When large positive land angle machining is used, the tool wear is serious and the cutting vibration is also large.

2. Lip Relief Angle

If the lip relief angle increases, the strength of the tool edge will decrease, and the worn area of the flank will gradually increase. After cutting tool lip relief angle is too large, cutting vibration is strengthened.

3. Helix angle

When the helix angle is small, the cutting edge which cuts into the graphite workpiece simultaneously on the same cutting edge has the longest cutting edge length, the greatest cutting resistance and the greatest cutting impact force, so the tool wear, milling force and cutting vibration are the greatest. When the helix angle is large, the direction of milling resultant force deviates from the surface of the workpiece to a great extent, and the cutting impact caused by the collapse of graphite material is intensified, so the tool wear, milling force and cutting vibration are also increased. Therefore, the influence of tool angle change on tool wear, milling force and cutting vibration is caused by the combination of land angle, lip relief angle and spiral angle, so more attention must be paid to the selection.

Through a large number of scientific tests on tool grinding, our tool grinding machines optimizes the geometric angle of the relevant tool in the design, thus greatly improving the overall cutting performance of the tool.