TWI554356B - Drill manufacturing method - Google Patents

Description

Drill manufacturing method

The present invention relates to a method of manufacture, and more particularly to a method of making a drill bit.

Referring to FIG. 1 , a conventional drill bit 1 includes a clamping portion 11 , a chip removing portion 12 extending along a longitudinal direction of the clamping portion 11 , and a coupling portion 12 opposite to the clamping portion 11 opposite to the clamping portion 11 . One end of the drill tip 13. The chip evacuation portion 12 has a plurality of chip flutes 121 which are spirally wound.

The user can hold the drill 1 by a power tool (not shown) by the clamping portion 11, and then spray the cutting fluid to drill the workpiece (not shown). action. During the drilling process, the chips of the workpiece move along the chip flutes 121, and the chip flutes 121 also allow the cutting fluid to smoothly reach the drill tip portion 13.

Since the chip flutes 121 are machined by milling, the material originally placed on the chip discharge portion 12 is cut off and wasted, and the manufacturing process takes a lot of time.

Accordingly, it is an object of the present invention to provide a method of manufacturing a drill bit that utilizes a fast and non-wasting material to make a flute.

Thus, the method of manufacturing the drill bit of the present invention comprises a preparation step a chip forming step, a hardening step, a soldering step, and a surface treating step.

The preparation step is to prepare a metal rod body and a metal drill tip. The shaft member has a rod body, a clamping portion formed at one end of the rod body for being clamped by the electric tool, and a joint portion formed at the other end of the rod body. The drill tip has a receiving portion that can be coupled to the joint of the shaft member.

The chip flute forming step is to place the shaft member between two parallel sets of powered roller sets. The two-power rolling roller set can simultaneously roll the rod body of the shaft member to form a plurality of spiral grooves around the chip flute on the rod body.

The hardening treatment step is to perform local heat treatment of the shaft member at 800 to 1100 ° C for 15 to 60 seconds to harden the hardness of the shaft member to a Vickers hardness of 500 Hv to 600 Hv. In the welding step, the joint portion of the shaft member and the receiving portion of the drill tip member are welded to each other to form a bit blank. The surface treatment step is to remove the excess solder of the surface of the bit blank and the periphery of the weld to prepare the drill bit.

The effect of the present invention is that in the chip flute forming step, the power rolling roller sets are utilized to make the manufacturing process of the chip flutes fast and without wasting material, and the drill bit is more efficiently produced.

21‧‧‧ Preparation steps

22‧‧‧ Chip flute forming steps

23‧‧‧ Hardening treatment steps

24‧‧‧welding steps

25‧‧‧ Surface treatment steps

3‧‧‧ drill bit

30‧‧‧ shaft parts

31‧‧‧ rod body

311‧‧‧ joints

312‧‧‧ chip flute

32‧‧‧Clamping Department

33‧‧‧Drill tip

331‧‧‧Acceptance Department

Other features and effects of the present invention will be apparent from the embodiments of the drawings, in which: 1 is a front view showing a conventional drill bit; FIG. 2 is a flow chart showing a preferred embodiment of the method for manufacturing the drill bit of the present invention; and FIG. 3 is a front view showing a preferred embodiment A drill bit made.

Referring to Figure 2, a preferred embodiment of the method of making a drill bit of the present invention comprises a stocking step 21, a chip flute forming step 22, a hardening step 23, a soldering step 24, and a surface treating step 25. Through the above steps, a drill bit 3 as shown in Fig. 3 is produced, which is used for drilling by a power tool (not shown).

Referring to FIG. 2 and FIG. 3, the preparation step 21 is to prepare a metal body member 30 and a metal drill tip member 33. The shaft member 30 has a rod body 31, a clamping portion 32 formed at one end of the rod body 31 for being clamped by the electric tool, and a joint portion 311 formed at the other end of the rod body 31. The drill tip member 33 has a receiving portion 331 that can be coupled to the joint portion 311 of the shaft member 30.

In the chip flute forming step 22, the shaft member 30 is placed between two parallel sets of powered roller sets (not shown). The two-power rolling roller set can simultaneously roll the rod body 31 of the shaft member 30, and the plurality of molding spirals surround the chip flute 312 on the rod body 31.

The hardening treatment step 23 is to perform local heat treatment of the shaft member 30 at 800 to 1100 ° C for 15 to 60 seconds to harden the hardness of the shaft member 30 to a Vickers hardness of 500 Hv to 600 Hv to avoid drilling. The problem of quenching occurs due to an increase in temperature. Usually, in order to facilitate the work, the hardening process step 23 is performed by a high-frequency machine.

In the welding step 24, the joint portion 311 of the shaft member 30 and the receiving portion 331 of the drill tip member 33 are welded to each other to form a bit blank (not shown). In order to achieve an optimum joint density, the shaft member 30 and the drill tip member 33 may be joined by brazing.

The surface treatment step 25 is to form the drill bit 3 by grinding out the surface of the bit blank and the excess solder on the periphery of the weld to be flattened (that is, commonly referred to as deburring).

Incidentally, since the action of the drilling is affected by mechanical properties and thermal properties, the material selection of the shaft member 30 is determined according to the practical application. For example, if the cement is to be drilled, the material of the shaft member 30 is selected from medium carbon chromium molybdenum alloy steel and medium carbon nickel chromium molybdenum alloy steel.

Compared to the drill 1 shown in Fig. 1, the chip flutes 312 of the present invention have a tighter pitch, but do not affect the function of guiding the chips and the cutting fluid. Moreover, due to the characteristics of the rolling process, the threaded surfaces formed by the chip flutes 312 are smooth and have good strength.

In summary, the present invention mainly rolls the rod body 31 of the shaft member 30 by the power rolling roller sets in the chip forming step 22 to manufacture the chip flutes 312. The process is fast and without wasting material, and the drill bit 3 is made more efficiently, so that the object of the present invention can be achieved.

However, the above is only the preferred embodiment of the present invention, and the scope of the present invention cannot be limited thereto, that is, according to the present invention. The simple equivalent changes and modifications made by the scope of the patent application and the contents of the patent specification are still within the scope of the invention.

21‧‧‧ Preparation steps

22‧‧‧ Chip flute forming steps

23‧‧‧ Hardening treatment steps

24‧‧‧welding steps

25‧‧‧ Surface treatment steps

Claims (4)

The invention relates to a method for manufacturing a drill bit, which is used for clamping a power tool, comprising: a preparation step, a shaft member made of a metal material, and a metal drill tip member, the shaft member having a rod body, a clamping portion formed at one end of the rod body for clamping the electric tool, and a joint portion formed at the other end of the rod body, the drill point member having a joint portion corresponding to the shaft member a receiving portion; a chip forming step of placing the shaft between two parallel powered roller sets, the two-roll rolling wheel simultaneously rolling the shaft of the shaft And forming a plurality of spirals around the chip flutes on the rod body; a hardening treatment step is to perform local heat treatment of the rod body at 800~1100 ° C for 15~60 seconds to harden the shaft body The hardness reaches a Vickers hardness of 500Hv to 600Hv; in a welding step, the joint portion of the shaft member and the receiving portion of the drill tip member are welded to each other to form a bit blank; and a surface treatment step of the drill bit Excessive solder on the surface of the billet and the periphery of the weld is ground Formation, the drill bit is made. The method for manufacturing a drill bit according to claim 1, wherein in the preparing step, the material of the shaft member is selected from medium carbon chromium molybdenum alloy steel and medium carbon nickel chromium molybdenum alloy steel. The method of manufacturing the drill bit according to claim 1, wherein the hardening treatment step is performed by a high-frequency machine. The method of manufacturing a drill bit according to claim 1, wherein the welding step is to braze the shaft member and the drill tip member.