solid carbide drill bit is made from a complete carbide bar, processed by grinder . It has the characteristics of high strength, high hardness, fast cutting speed, wear resistance and good thermal hardness, and is suitable for processing parts of various materials. According to the cooling structure, it can be divided into two types: external cooling drill and internal cooling drill.
(This article is selected from Chapter 5, Section 1 (6) Solid Carbide Drills of " CNC Tool Selection Guide ")
(1) Features and Selection
. Features and Uses
(1) Good rigidity and high strength , it is easy to obtain higher drilling accuracy.
(2) can be suitable for drilling more complex materials and can choose a higher cutting speed.
(3) effectively reduces edge chipping and has good wear resistance.
(4) Multi-layer geometric cutting end edge improves chip removal performance and maintains low cutting resistance.
(5) In addition to the commonly used right-angle shank, there are a variety of shank types, suitable for use with various drilling rigs and drilling machines .
(6) Compared with indexable insert drills, solid carbide drills can be regrinded 7 to 10 times.
. Key points for selecting Before processing parts, first select the type of carbide (P, M, K, S, N, etc.) according to the material of the part; secondly, select different drill bit sizes according to the size and depth of the drilling hole. and structure, such as two-edge, three-edge, etc.; finally, select different cutting parameters according to the equipment and product accuracy.
(2) Typical product introduction
. Carbide drill bit (Sunde)
(1) Product introduction. Songde solid carbide drill bits (see Figure 5-25) are designed and manufactured with reference to DIN6537 standards. Its arc-shaped curved cutting edge contributes to good chip breaking performance during machining. Its unique groove design ensures smooth chip removal and has high torsional rigidity. Songde solid carbide drill bits provide the following types:
A: The processing accuracy of ordinary carbide twist drill bits can reach H8 level, and some can reach H7 level under certain conditions, including drill bits with aspect ratios of 3 times diameter and 5 times diameter.
B: The length-to-diameter ratio of the deep-hole twist drill bit is more than 10 times the diameter, and can reach up to 25 times the diameter. However, when processing, pay attention to the fact that the pilot hole must be drilled, and the grooves are all polished and have a double-edged design.
C: There are two types of three-edged twist drills with length-to-diameter ratios of 3 times diameter and 5 times diameter, with a vertex angle of 150°. They are usually used for hole enlarging and drilling before deep hole processing.
D: The length-to-diameter ratio of straight flute drill reamers ranges from 3 times diameter to 10 times diameter. They are usually used to process short-chip materials. Compared with ordinary twist drill bits, it has higher cutting speed and strength, and the processed holes have good straightness and , and can reach H7 processing accuracy.
Figure 5-25 Carbide drill bit
(2) Product features
) Drill bit diameter φ~φ5mm, both can provide internal cooling and external cooling.
) Use ultra-fine grained carbide rods imported from Europe.
) Advanced nano-level TiAlN coating, a perfect combination of high wear resistance, low friction coefficient and extremely strong adhesion.
4) Unique edge processing technology.
5) The reliable groove design improves the chip breaking performance of the drill bit and reduces cutting resistance.
(3) Application examples
) Processed parts: car door hinges.
) Parts material: low carbon cast steel.
) Hole diameter: d=13.4mm, hole depth L=12mm.
4) Cutting parameters: vc=106m/min, f=0.16mm/r.
5) Processing effect: Under the same cutting parameters, the service life is 20% longer than that of a customer's European brand.
. General processing twist drill GD series ( Zhuzhou diamond )
(1) Product introduction. The general machining twist drill GD series (see Figure 5-26) has stable and long-lasting tool life, excellent machining accuracy, and good chip breaking performance. Straight cutting edge, high strength, optimized drill tip structure, better cutting performance. The combination of cutting simulation and experiment, excellent structural design, and better overall performance. Double blade design improves processing stability. Professional coating post-processing technology ensures low resistance and efficient processing.
Figure 5-26 General machining twist drill GD series
(2) Product features: is highly versatile and can achieve efficient processing of P type (steel), M type (stainless steel), K type (cast iron) and other materials .
(3) Application cases
) Tool model: GD03C-0820.
) Processing material: C70S6 (30HRC).
) Cutting parameters: vc=120m/min, f=0.23mm/r, hole depth L=30mm.
4) cutting fluid : water-soluble cutting fluid (internal cooling).
5) Cutting results: Under the same parameters, the life of ZCC·CT products is more stable and lasting (see Figure 5-27).
Figure 5-27 Cutting results
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. ST series twist drill (Zhuzhou Diamond)
(1) Product Features
) Optimized drill tip structure is conducive to obtaining conical spiral cuts that are easy to break. crumbs.
) The unique groove design ensures sticky materials while taking into account the rigidity of the drill bit.
) Smooth discharge of chips during processing.
4) Nano-scale TiAlN coating, excellent wear resistance and high temperature resistance.
(2) Application case
) Part name: valve body .
) Parts material: Cast 316SS stainless steel.
) Tool: 1534ST03C-0520.
4) Processing parameters: n=3200r/min, f=0.1mm/r, hole depth L=15mm.
5) Cutting fluid: emulsion (internal cooling).
6) Comparison of main cutting edge wear when machining to 450 holes (see Figure 5-28).
Figure 5-28 Comparison of main cutting edge wear
a) 1534ST03C-0520 b) Comparison of the number of machined holes in company A’s products
7 (see Figure 5-29).
Figure 5-29 Comparison of the number of processed holes
