TW201347949A - Manufacturing method of drill structure and drill structure - Google Patents

Abstract

A manufacturing method of drill structure includes forming a plurality of patterned grooves on the outer surface of one end of drill bit cutting part. Then a plastic injection molding is used to form as a drill shank, which is made of the engineering-plastic. One end of the drill shank covers portion of the drill bit cutting part and the engineering-plastic is filled with the patterned grooves. The hardness of the engineering-plastic is over 20HRC and the heat-resisting temperature of the engineering-plastic is between 100 DEG C and 400 DEG C. A drill structure is also provided. This manufacturing method of drill structure has the advantage of decreasing the material cost and manufacturing cost.

Description

Method for manufacturing bit structure and bit structure

The present invention relates to a method for manufacturing a drill bit structure and a drill bit structure, and more particularly to a method for manufacturing a drill bit structure using an engineering plastic as a shank portion and a drill bit structure.

Generally, the drill bit used on the printed circuit board is made of high-hardness tungsten carbide material. The early drill bit is made of tungsten carbide integrally formed in either the drill blade or the shank, which is expensive due to the high cost of the tungsten carbide material. The manufacturing cost of the drill bit is high and cannot be reduced, and it is less economical.

At present, most drill bits use stainless steel as the shank, and the combination of the stainless steel shank and the drilled edge is diversified, one of which is the end-to-end welding method, and the other forms a concave end at the end of the shank. The groove is formed, and one end of the cutting edge portion is inserted into the groove to be fixed. The manufacturing method of the above-mentioned drill bit structure requires processing and combining the shank portion and the drill blade portion made of tungsten carbide or stainless steel one by one, and the labor cost is high. In recent years, the cost of stainless steel has gradually increased, which is not conducive to the production of drill bit manufacturers. Once the drill bit is damaged as a scrap, the stainless steel handle can not be reused, resulting in waste of resources.

In order to solve the above problems, one of the objects of the present invention is to provide a method for manufacturing a drill bit structure, which is manufactured by a method of injection molding to manufacture a drill handle portion made of engineering plastic, instead of using expensive tungsten carbide or stainless steel as a drill. The high cost of the handle, in which the shank is shot-molded, can be manufactured in batches with a large number of bit structures, and is required to be used in advance. The invention has the advantages of saving labor cost and time cost for the process of processing the combination of the shank portion of tungsten carbide or stainless steel and the cutting edge portion.

One of the objects of the present invention is to provide a method for manufacturing a drill bit structure, wherein the mold used in the injection molding process can be appropriately formed into an appearance design conforming to the requirements of the drill handle portion, and has the advantages of simplifying the process to increase the productivity.

One of the objects of the present invention is to provide a drill bit structure which uses engineering plastic as the shank portion and cooperates with the embossed groove design on the outer surface of the fixed portion of the drill blade portion, and has the effect of high binding tightness.

In order to achieve the above object, a method for manufacturing a drill bit structure according to an embodiment of the present invention includes: providing a drill blade portion including a body portion and a fixing portion extending to one end of the body portion; and an outer surface of the fixing portion Forming an embossed groove; and fixing a shank portion made of engineering plastic to the fixing portion by injection molding, so that one end of the shank portion is covered with the fixing portion, and the engineering plastic material is covered with embossed grooves, engineering plastic The hardness is greater than 20HRC, and the engineering plastics withstand temperatures between 100 ° C and 400 ° C.

A drill bit structure according to another embodiment of the present invention includes: a drill blade portion including a body portion and a fixing portion extending from one end of the body portion, and an outer surface of the fixing portion is formed with an embossed groove; and a shank portion It consists of engineering plastics. The hardness of engineering plastics is greater than 20HRC, and the temperature of engineering plastics is between 100°C and 400°C. The end of the shank is covered with the fixed part of the cutting edge and the engineering plastic is covered with embossing. Groove.

1a to 1c are schematic flow charts showing a method of manufacturing a drill bit structure according to an embodiment of the present invention. As shown in FIG. 1a, a method of manufacturing a drill bit structure includes providing a drill blade portion 10 including a body portion 12 And a fixing portion 14 is formed at one end of the body portion 12; the connector, as shown in FIG. 1b, is located at the body portion 12 The outer edge is formed with a blade portion 16 for cutting or drilling, and an embossed groove 18 is formed on the outer surface of the fixing portion 14; thereafter, an engineering plastic is fixed to the fixing portion 14 by injection molding. The shank portion 20 is such that one end of the shank portion 20 covers the fixing portion 14, as shown in FIG. 1c, to form a drill structure 30, and the engineering plastic is covered with embossed grooves 18, and the hardness of the engineering plastic is greater than 20HRC, and The engineering plastics are subjected to temperatures between 100 ° C and 400 ° C.

Following the above description, the cutting edge portion 10 is formed in a round rod shape and is made of a tungsten carbide bar. The cutting edge portion 10 is formed by integrally forming a diamond grinding wheel to form the blade portion 16 and the embossed groove 18, in an embodiment. The embossed grooves 18 are obliquely staggered grooves. Further, as shown in FIG. 1b, an annular groove 22 is further formed on the outer surface of the fixing portion 14, as shown in FIG. 1c, when the shank portion 20 is drilled. When the fixing portion 14 is covered, the engineering plastic also fills the annular groove 22. Among them, the engineering plastics are preferably selected from the group consisting of polyamines, polyesters, polyethers, aromatic heterocyclic polymers, symmetric polystyrene (sPS), and polytrimethylene terephthalate (Polytrimethylene). Terephthalate (PTT), poly(1,4-cyclohexanedimethanol terephthalate) (PCT), thermosetting plastics such as Phenolic Resins, Silicone, Epoxy and One of the melamines is an engineering plastic with high hardness and high temperature resistance.

Among them, polyamines include: Polyamide 66 (PA66), Polyamide 46 (Polyamide 46, PA46), Polyamide 6T (Polyamide 6T, PA6T), Polyamide 9T (Polyamide 9T, PA9T) ), Polyamide-imide (PAI) and Polyurethane (TPI).

The polyesters include: polycarbonate (Polycarbonate, PC), polybutylene terephthalate (PBT), and liquid crystal polyester (LCP).

Polyethers include polyoxymethylene (POM), polyphenene sulfide (PPS), polyethersulfone (PES), Polyetherketone (PEK) and polyetheretherketone (PEEK).

The aromatic heterocyclic polymer comprises: polyetherimide (PEI) and polybenzoimidazole (PBI).

In the present invention, the engineering plastic with high hardness and high temperature resistance as the shank portion can replace the high cost incurred by the conventional use of expensive tungsten carbide or stainless steel as the shank portion, and the manufacturing method of the shank injection molding can be used. The batch performs a large number of bit structure manufacturing, and the invention has labor and cost savings compared to the conventional process of processing the combination of the tungsten carbide or stainless steel shank and the cutting edge portion. Furthermore, the mold used in the injection molding process can be appropriately selected to be integrally designed to meet the requirements of the shank, such as the design of the leading edge of the shank of the shank; as opposed to conventional tungsten carbide or stainless steel The shank portion needs to be subjected to a subsequent grinding process to form a proper shank appearance. The invention has the advantages of simplifying the process to increase the productivity.

2 is a schematic structural view of a drill bit structure according to an embodiment of the present invention. As shown in FIG. 2, the drill bit structure 30 includes a shank portion 20 and a drill blade portion 10, wherein the shank portion 20 and the tungsten carbide formed by the engineering plastic are The fixing portion 14 of the cutting edge portion 10 of the material is fixed together, and the engineering plastic is covered with the embossed groove 18 and the annular groove 22 on the outer surface of the fixing portion 14, thereby increasing the bonding strength between the fixing portion 14 and the shank portion 20. The design of the embossed groove 18 can effectively prevent relative torsional movement between the drill edge portion 10 and the shank portion 20, and the annular groove 22 is designed to prevent the between the drill edge portion 10 and the shank portion 20. The relative sliding has the advantage that the drill bit structure 30 has high quality. Furthermore, since the heat resistance temperature of the engineering plastic is much smaller than the sintering temperature of the tungsten carbide (about 1400 ° C), once the drill bit structure is damaged, it can be recovered, heated to melt the engineering plastic, and the drill blade portion 10 is separated. The melted engineering plastic can be further reused in the manufacture of the shank 20, which has the advantages of cost savings and environmental protection.

In summary, the manufacturing method of the drill bit structure of the present invention is such that the engineering plastic forms a shank portion through the injection molding method to cover the fixing portion of the drill cutting portion, which has the advantages of simplifying the process and reducing the cost, and is matched with the fixing of the cutting edge portion. The embossed groove design on the outer surface of the part has the effect of being tightly combined with the shank of the engineering plastic.

The embodiments described above are merely illustrative of the technical spirit and the features of the present invention, and the objects of the present invention can be understood by those skilled in the art, and the scope of the present invention cannot be limited thereto. That is, the equivalent variations or modifications made by the spirit of the present invention should still be included in the scope of the present invention.

10‧‧‧Drilling

12‧‧‧ Body Department

14‧‧‧ Fixed Department

16‧‧‧blade

18‧‧‧ embossed groove

20‧‧‧Drilling handle

22‧‧‧ annular groove

30‧‧‧Drill structure

1a to 1c are schematic flow charts showing a method of manufacturing a drill bit structure according to an embodiment of the present invention.

2 is a schematic view showing the structure of a drill bit according to an embodiment of the present invention.

10‧‧‧Drilling

12‧‧‧ Body Department

14‧‧‧ Fixed Department

16‧‧‧blade

18‧‧‧ embossed groove

20‧‧‧Drilling handle

22‧‧‧ annular groove

30‧‧‧Drill structure

Claims (10)

A method for manufacturing a drill bit structure, comprising: providing a drill blade portion including a body portion and a fixing portion extending to one end of the body portion; forming an embossed groove on an outer surface of the fixing portion; Fixing a shank portion made of engineering plastic to the fixing portion by injection molding, so that one end of the shank portion covers the fixing portion, and the engineering plastic material fills the embossed groove pattern, the engineering plastic material The hardness is greater than 20HRC, and the engineering plastic is subjected to a temperature between 100 ° C and 400 ° C. The method for manufacturing a drill bit structure according to claim 1, wherein the drill blade portion is made of a tungsten carbide rod, and the embossed groove pattern is integrally formed by a diamond grinding wheel. The method for manufacturing a drill bit structure according to claim 1, wherein the engineering plastic is selected from the group consisting of polyamines, polyesters, polyethers, aromatic heterocyclic polymers, symmetric polystyrene, polyterephthalic acid. One of propylene glycol, 1,4-cyclohexanedimethanol terephthalate, thermosetting plastic, silicone, epoxy resin and melamine. The method for producing a drill bit structure according to claim 3, wherein the polyamine contains polyamide 66, polyamide 46, polyamide 6T, polyamine. 9T (Polyamide 9T), Polyamide-imide and Aurum, the polyester comprising polycarbonate (Polycarbonate), polybutylene terephthalate and Liquid crystal poly polymers, which include polyoxymethylene, polyphenlene sulfide, polyethersulfone, polyetherketone, and polyetheretherketone. The aromatic heterocyclic polymer comprises a polyetherimide and a polybenzoimidazole, and the thermosetting plastic comprises a phenolic resin (Phenolic Resins). The manufacturing method of the drill bit structure of claim 1, further comprising forming at least one annular groove on the outer surface of the fixing portion, and the engineering plastic fills the annular groove. A drill bit structure comprising: a drill blade portion including a body portion and a fixing portion extending at one end of the body portion, and an outer surface of the fixing portion is formed with an embossed groove; and a drill handle portion Constructed by engineering plastics, the hardness of the engineering plastic is greater than 20HRC, and the engineering plastic is subjected to a temperature between 100 ° C and 400 ° C, and one end of the drill handle portion covers the fixing portion of the drill cutting portion, and the engineering The plastic is covered with the embossed groove. The drill bit structure of claim 6, wherein the fixing portion has a round rod shape, and an outer surface of the fixing portion is formed with at least one annular groove and fills the engineering plastic. The drill bit structure of claim 6, wherein the embossed groove pattern is an oblique staggered groove. The drill bit structure of claim 6, wherein the engineering plastic is selected from the group consisting of polyamines, polyesters, polyethers, aromatic heterocyclic polymers, symmetric polystyrene, and polytrimethylene terephthalate. , polybutylene terephthalate 1,4-cyclohexane dimethanol ester, thermosetting plastic, silicone, epoxy resin and melamine. The bit structure of claim 9, wherein the polyamine comprises Polyamide 66, Polyamide 46, Polyamide 6T, Polyamide 9T (Polyamide) 9T), Polyamide-imide and Aurum, the polyester comprising polycarbonate (Polycarbonate), polybutylene terephthalate and liquid crystal polyester (Liquid crystal poly polymers), the polyethers include polyoxymethylene, polyphenlene sulfide, polyethersulfone, polyetherketone, and polyetheretherketone. Group heterocyclic polymers comprising polyetherimide (polyetherimide) and polybenzimidazole (Polybenzoimidazole), the thermosetting plastic contains Phenolic Resins.