Drill bit grinding machine introduction

As the name implies, the drill grinding machine is a machine that precisely grinds the drill bit. Drill grinding machine is also called drill grinding machine. Different drills have different grinding machines. Such as: Universal bit grinding machine, three slope bit grinding machine, step bit grinding machine, small bit grinding machine, etc. Grinding is accurate and fast, easy to operate and easy to grind.

Characteristics of Drill bit grinding machine:
1. Grinding is accurate and fast, easy to operate, and easy to grind without skills.
2. Economic price, greatly saving cost and improving use efficiency.
3. Equipped with diamond wheel, precise and durable.
4. Strong dc motor with electronic control: stable frequency, strong horsepower, and can be used for a long time.
5. Adopt bearing rotation, lock and grind the angle accurately.
6. The machine is equipped with the function of static point (center point) size adjustment, which can effectively cooperate with the drilling material material and speed, control the quality and accuracy of the workpiece and extend the life of the drill.
7. It can grind the front cutting edge (front angle) of the drill bit, with the tip angle (top angle), clearance angle (back angle), front cutting edge (front angle) and center cross edge size adjusted at will, which can replace the center drill, with more accurate positioning, easier chip removal and easier cuttings.

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Types and application of milling cutter grinder

Milling cutter grinder is a kind of machine that can be used to grind and repair milling cutter in industry. It can grind general end milling cutter such as 2-edge, 3-edge and 4-edge, and can also cut out the edge directly with tungsten rod. It is a small tool grinder which is necessary to restore the milling cutter as new.
So, what are the types and uses of milling machine? Next, PURROS will introduce the classification and application of the lower milling cutter grinder for your reference.

I.Classification of milling cutters and grinders
Milling cutter grinder can be divided into the following categories according to different functions:
1.End milling cutter grinder

The milling cutter grinder, which can only grind the end face of milling cutter, has a little less function, but its body is small and exquisite, and its operation is simple, which is suitable for small and medium-sized enterprises and family workshops.
2.Spiral milling cutter grinder

It is suitable for grinding the side edge of the spiral milling cutter. It has strong function, but its body is also slightly heavy. It is suitable for grinding the spiral milling cutter.
3.Ball end milling cutter grinder

The ball end milling machine with patented technology breaks the limitation that the ordinary milling machine can only grind the side edge of the ordinary end face, and can perfectly grind the first and second angles of the ball end milling machine.
4.Round nose milling cutter grinder

It can not only grind end milling cutter, but also round nose milling cutter r fillet. The grinding effect of this method is remarkable.

II. Application description
1. The general milling machine can grind general end mills such as 2-edge, 3-edge, 4-edge and 6-edge (> 12), and can also cut out the cutting edge directly with tungsten rod.
2. It has the characteristics of small body, precise and fast grinding, simple operation, and easy grinding without skills.
3. If the machine is equipped with diamond grinding wheel, only one grinding wheel can complete all processes, with accurate angle, long service life, cost saving and improved use efficiency.
4. According to the material of milling cutter, different grinding wheels can be selected to achieve the purpose of perfect repair. CBN is suitable for grinding high speed steel, SDC is suitable for grinding alloy tungsten steel, remember not to make mistakes.
5. According to the milling cutter that needs to be grinded, select the collet suitable for the standard diameter of the milling cutter, match with the appropriate collet group, and put it into the milling base for grinding.

Some tips of quick sharpening drill bit

Here’s some quick sharpening tips.

Keep the glasses on use the guard practice with your crappiest tools first. So when you get the hang of this when you nicer your better drill bits you got some skills. We’ll make this better as far as we can.

Sharpen the skills of the drill bit, how to repair and grind the drill bit, how to repair and grind the drill bit, how to repair and grind the top Angle of the drill bit, how to repair and grind the Leading Edge of the drill bit

Here we are at bench grinder. What we’re going to do? We’ve got a bad drill bit and you’ll notice the leading edge the top. Leading edge is what does all the work of a drill bit. When we hit bad material, it doesn’t remove material anymore. Eventually it’ll blew and ruin the drill bit if we want to take off some of the material on the back side.

Next we will going to show that I do to polish the front.

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We’re gonna hold it just for a second or two like that in the Leading Edge. To clean this leading edge up the face and then we’re gonna grind on the backside of the bit slowly. Bringing the bit down until we see sparks hit the front. We’re gonna use all the side of the wheel.

When you’re doing this you look down and see where the center is and when you do one side. And you got your hands in position. You don’t look at it.

Then go back down and do it again. What happens as you lose your hand positioning so to do you look down this leading edge. And you watch the sparks. And you just touch it and you flip it over you don’t move your hands. See what that did is it gave me a clean Edge we can see my surface.

When we are going to sharpen now. We can see how grounded. We swallow they bring it down until we see some sparks coming off the front. The material going down now we don’t get to look at it. We go back off the back. We rotate it to do the other half. Then we start at the back. We go down they see well when we get near the tip. We push less and less hard. So there is their cut. It’s going downhill. So the leading edge is the highest point.

It’s sharp as a razor right now. And both side look about the same decides. A little worse than the other. And we checked for center the other trick with. When we do the face of the grinding so wide. This is here we’re going to narrow that up a little bit. So when this goes on a piece of metal and it’s spinning. It’s not wandering all over the narrower that is better it stays on your mark. It doesn’t wonder as you’re trying to drill. So that just got narrower if you know what we are looking at you see. Its narrower now in the center as we get sharper. We’ve pushed less higher. So we actually have little too steep of a relief angle on this side.

These are some tips of quick sharpening drill bit. This method of grinding drill bits depends entirely on experience and feeling. We recommend our drill bit grinder products to you. It can finish drill grinding easily and correctly. Welcome to consult our products.

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The purpose of grinding the major cutting edge of drill bit

The purpose of grinding is to change the edge shape or point angle to increase the front angle and control chip breaking. Or change the distribution of cutting load, increase the heat dissipation condition and improve the life of drill bit.

Three ways to sharpen the major cutting edge:

Three ways to sharpen the major cutting edge

Grinding the concave arc edge and strengthening the centering function of the drill are helpful for chip separation and chip breaking.
Grinding out double or multiple point angles, or grinding out convex arc edges, can improve the heat sink at the edge of the drill edge and increase the life of the drill bit, which is suitable for brittle materials.
Grinding out the chip dividing groove to facilitate chip removal.

There are many points of attention and its use in grinding drill bits. If customers have difficulties in drill grinding, please consult us. We are a manufacturer of drill bit grinding machines. We are familiar with drill bit grinder product structure and function.

Control Method of Drilling Depth in Blind Hole Drilling

Important tips for drilling:

The feeding amount should be small when the drilling starts, and the normal drilling can be achieved only after the cutting part of the twist drill enters the workpiece.
When drilling through holes to be drilled through the workpiece, the feed should be small in order to prevent the twist drill from breaking.
When drilling small holes or deep holes, the twist drill must always be withdrawn from the drill to remove chips, so as to prevent the twist drill from “biting” or breaking because of cutting blockage.
When drilling steel materials, cutting fluid must be poured sufficiently to cool the twist drill in order to prevent the twist drill from heating and annealing.

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Composition of twist drill

Twist drill is the most commonly used bit. Its body has spiral grooves and its end has cutting ability. The standard twist drill consists of shank, neck and body part.

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(1) shank

The shank is the clamping part of the drill bit, which plays a central role in fixing and the role of transmitting torque in drilling. The taper shank can transfer larger torque (mainly the flat tail part of the shank), which is used for drills larger than 12 mm in diameter, while the straight shank can transfer smaller torque, which is generally used for drills smaller than 12 mm in diameter.

(2) neck

The neck is the connection between the handle and the working part, and serves as the position of the grinding wheel when grinding the outer diameter. Bigger diameter bits are marked with trademarks, bit diameters and material grades at the neck. Small diameter drill does not have neck.

(3) body

The body part of twist drill is the main part of the bit, which includes the guiding part and the cutting part.

How to assemble and disassemble twist drills?

The clamping method of parallel shank twist drill is basically the same as that of using drill chuck to install clamp center drill.

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Clamping of taper handle twist drill

a) clamping
b) Insert directly into the taper hole of the tailstock sleeve
c) Transition cone sleeve

The taper shank twist drill can be connected with the machine tool directly or through the transition sleeve. When the taper number of the bit shank is the same as the taper number of the tailstock sleeve taper hole, the bit can be inserted directly to realize their connection. If their taper numbers are different, they must be connected to the tailstock of the lathe through a transition sleeve.

When the twist drill in the Morse transition cone sleeve is dismantled, the wedge iron can be inserted into the waist hole, and the bit can be dismantled by tapping the wedge iron.

Disassembly of taper shank twist drill

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What is the process of machining sleeve parts with drill bits?

In machine parts, the parts with holes are usually called sleeve parts. The bushing shown in the figure below is a sleeve part.

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Machining sleeve parts with drill bits

Machining sleeve parts with drill bit

If a bit is used to process a set of solid workpiece, the hole must be drilled first and then different machining methods must be selected according to the precision requirements of the hole. If want to process the hole of the workpiece in the drawing, its reasonable processing technology is: drilling→reaming→turning hole→reaming.

The solid blank shall be processed according to the ” sleeve processing diagram “

The solid blank shall be processed according to the ” sleeve processing diagram “, in which the hole can be processed by drilling method to meet the requirements. The usual tool for drilling holes is a twist drill.

Inspection method after bit grinding

The worn bit can be tested by template test after grinding, but visual inspection is often used in many factories for convenience.

So how do you test it visually?

Inspection Anglewith Tool

First of all, the cutting part of the bit is erected upward with two eyes at eye level. Since the two main cutting edges of the bit will produce parallax in front of each other, it is often felt that the two cutting edges will look higher and lower. Rotate the drill 180 degrees more times when looking at the head, if the results are the same, the symmetry will be shown. Same thing for the lip relief angle, same angle of inclination. Since the bit is grinded by hand, it needs to be inspected after it is polished.

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If the drill bit grinding machine is used, the grinding bit will be more accurate and the grinding bit will be more standard. The grinded bit shall be tested and used after qualified.

The selection of main geometric parameters for the grinding of twist drill bit

The main geometric parameters of twist drill include the choice of cutting lip angle, the choice of land angle of cutting edge and lip clearance angle of cutting edge, the analysis of the influence of helix angle on the life of drill bit and the treatment of cutting edge.

Cutting lip angle determines chip width and bit front angle. When the diameter and feed of the bit remain unchanged, increasing the top angle will narrow the iron filings and reduce the load per unit cutting lip. Cutting lip angle has a great influence on the land angle. Increasing cutting lip angle correspondingly can improve the cutting conditions at the core. Cutting lip angle affects the direction of chip outflow. According to the relevant tool design data and the characteristics of low hardness but high viscidity of the processed product, the cutting lip angle of the bit is selected to be 140°.

The land angle of a twist drill is determined by other geometric parameters of the drill. In high-speed cutting, the rake angle has little influence on cutting deformation and cutting force, and the strength of tool tip can be enhanced with a smaller land angle. When the land angle is determined, the bigger the lip clearance angle is, the sharper the edge is, but the wedge angle will decrease correspondingly, which will affect the strength and heat dissipation area of the tool. For this purpose, the lip clearance angle of the drill bit is selected as a smaller one, which is 8°.

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If you choose our drill grinding machine, you can easily finish the drill grinding work. You can achieve the desired results by choosing the right chuck according to your drill bit. Our drill bit grinding machine makes complex drill grinding easy. If you are interested in our products, please contact us. We are a manufacturer of drill bit grinding machines. The price is relatively favorable. We welcome agents to negotiate business.