A new idea of designing the lighter bit

2022-10-15
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The design of hole machining tool is a complex process that needs to coordinate many technical problems. The above two factors of seco carboloy company (located in Warren, Michigan, USA) mainly affect the zero output drilling product manager of the sensor of the tensile testing machine, Goran Melin said, "it is often a technical problem in one aspect that is solved, which will inevitably produce new problems on the other." These need to coordinate many aspects of its ease of machining, usually including tool life, machining accuracy and stability. Tool designers need to constantly find the best solution among these variables

from the design process of the latest perfomax clip on bit series produced by seco carboloy company, we can see that the above understanding is correct. Through the coordination of many technical problems, a new type of machine added bit is designed, which greatly expands the scope of application

the problem is this: in many choices of tools for hole machining, machine clamped drills are usually a low-cost solution. According to Mr. Melin, the blade of the machine clip drill has four cutting edges. Usually, the service life of the blade of the drill is replaced (depending on the workpiece material). Therefore, compared with integral and welded drills and drills with replaceable heads, the cost of each cutting edge of machine clamped drills is obviously lower

however, in general, a wide machining tolerance is required when drilling with a machine clamp drill, Mr. Melin said. Because this kind of drill actually has asymmetric cutting edges. The machine clip drill uses two blades, one of which passes through the center and the other extends from the inside to the entire diameter. The reason for the uneven cutting force is that there is only feed resistance and the cutting speed on the central blade is zero, while the outer blade is more effective in cutting material because of its higher speed. As a result, the bit deflects at the entrance

"before the drill enters the whole cutting, you must know this unstable state," Mr. Melin said. "The longer the drill bit, the greater the deflection." Therefore, for longer drill bits, at the hole processing inlet (about 1mm), the feed speed should be reduced to% of the recommended value. When entering all cutting, use the recommended value for machining. However, this suggestion is not popular, because operators prefer to use the standard cutting amount provided by the programming software, rather than for a special feed rate, and do not have to reprogram manually to obtain the feed rate at the entrance. In addition, when a long drill is required for only a small amount of processing, the operator may be willing to use a long drill with good versatility instead of a short drill. But doing so will reduce accuracy and productivity

through analysis and comparison, both fried dough twist drill and integral cemented carbide drill have two cutting edges, which can separate chips in a balanced way in processing, promote chip removal and improve the cutting speed of the drill. While the machine clip drill has only one cutting edge, and the outer edge blade cuts most of the metal. This will limit the effective discharge of chips and the increase of feed speed. However, it will not generate much friction, because it does not have the wide blade band unique to fried dough twist drills. Therefore, it can be processed at a higher speed (RPM). Unfortunately, when using the clip on bit with a length of more than 4 times the diameter, especially when cutting with a large feed rate, the deformation of the bit has become a major technical problem to be solved. For these reasons, machine clip drills are mostly used for reaming and semi finishing where the dimensional tolerance is required to be 0.008 inch. Therefore, the use of clip on bits can achieve the desired economy, but it can not always achieve the required accuracy

in order to overcome the above constraints of closer and closer cooperation with parts manufacturers and automobile OEMs, engineers of seco carboloy company focused on the following five improvements in the design of a new type of machine clip drill bit. After padding, tighten the screws to work:

1 They retain more metal material on the outer edge of the drill to resist bending deformation caused by cutting force

2. They optimized the blade holder for holding the square blade, because the 90 ° knife point angle has good strength

3. The drill is designed with two coolant inlet holes and two slightly inclined chip removal grooves with enough space. So that the cutting area of the drill bit can be cooled sufficiently and chip can be removed effectively, and chip buildup can be reduced, so as to prolong the service life of the drill bit and maintain a consistent surface roughness

4. The surface of the drill bit is designed with a high wear-resistant coating to prevent debris from adhering to the surface of the cutter body and prolong the service life of the drill bit

5. The universal blade material grade organically combines high hardness, fine grain matrix and coating, allowing higher cutting speed

Mr. Melin said that this newly designed machine clamp drill enables users to obtain a significant increase in productivity in many processing (including deep hole parts, processing on jigs with poor rigidity and processing of thin-walled parts). By improving the stability and chip removal, the machining accuracy of the hole is improved. Coupled with the inherent advantages of low processing cost, it is very popular with users

at present, the specifications of the new machine clip drill are mm diameter range, and the drilling depth is times the diameter. Provide a variety of handle types, including universal handle types with two cutting planes suitable for lathe applications, etc. (end)

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