JP3212037U - Driver bit - Google Patents

Abstract

[PROBLEMS] To improve the wear resistance as well as the strength against the tip blade, to absorb excessive torque and impact extremely efficiently, and to have an extremely excellent durability and easily with a simple configuration. A driver bit that can be manufactured is provided. One end side portion including a tip blade portion, an intermediate portion including a pair of ear portions 22a, 22b, and the other end side portion using a metal material having wear resistance and durability. And the entire middle portion and the other end portion of the driver bit body 12 except for the one end side portion including the tip blade portion 14 are accommodated in a required resin mold. The thermoplastic resin material is extruded into a resin mold and integrally formed so that the resin material 20 has a required thickness as a whole, and the tip end portion 14a of the one end side portion including the tip blade portion 14 is It consists of a mirror-finished surface and a diamond coating. [Selection] Figure 1

Description

  The present invention relates to a driver bit that has been subjected to processing that can increase durability as well as wear resistance, and in particular, it can improve wear resistance at the tip edge part and at the same time, can cause excessive torque and impact on the driver bit. The present invention relates to a driver bit configured to be able to efficiently absorb and maintain a stable strength.

  Conventionally, in a rotary tool such as a driver bit that performs a predetermined work by rotating a work object such as a screw, there is a rotary tool that can absorb excessive torque and impact without causing a local decrease in strength. It has been proposed (see Patent Document 1).

  That is, the rotary tool described in Patent Document 1 includes a metal tool main body having an engaging portion that engages with a work object at an end, and the tool main body is hollowed out. The engagement portion is formed at one end portion of a metal rod-like body, and a portion from the other end portion to the middle portion of the rod-like body is inserted into the tool body. The rod-shaped body is fixed to the tool body by compressing and deforming the end of the tool body.

  The rotary tool configured in this manner is easily deformed elastically compared to the case where the tool body is hollow and is formed into a cylindrical shape having a predetermined thickness, and thus is excessively large. It is supposed that when torque or impact is applied, these can be absorbed.

Japanese Patent No. 4546568

  The driver bit described in Patent Document 1 is a rotary tool that can absorb excessive torque and impact without causing a local decrease in strength. It is made hollow, and a metal rod-like body is inserted into this hollow portion, and since the tool body is intended to use a metal made of aluminum, it is expected to have some impact absorption effect. However, it is extremely difficult to achieve superior characteristics compared to conventional products in terms of wear resistance or durability as a driver bit. That is, for the material and structural reasons of the tool body, it cannot be expected at all to improve the wear resistance or durability as a driver bit in connection with a metal rod-like body.

  Thus, as a result of various examinations and trial productions, the inventor is made of a metal material having required wear resistance and durability, and is fitted into a bit fitting groove provided on the top surface of the screw head. It consists of a driver bit body provided with a tip blade portion, and an intermediate portion including at least an ear portion of the driver bit body excluding the tip blade portion of the driver bit body, and the other end side portion as required, as a whole, By integrally covering and molding with a resin material having a thickness, it is possible to improve the wear resistance of the tip edge portion of the driver bit and to absorb excessive torque and impact extremely efficiently. It has been found that a driver bit that can remarkably improve durability can be obtained.

  In addition, it has been found that by applying a mirror finishing process to the surface of the tip portion of the tip portion of the driver bit body, the tip bit portion of the driver bit can be made slippery and wear resistance can be improved. It was. Furthermore, in this case, the wear resistance at the tip edge portion of the driver bit is improved by subjecting the tip edge portion of the driver bit body subjected to the mirror finish processing to diamond coating processing including the tip portion. In addition, the present inventors have found that a driver bit that can be increased in strength and superior in durability can be obtained.

  In the processing for the surface of the tip edge portion of the driver bit body, when performing the diamond coating processing together with the mirror finish processing, after applying electroless nickel plating to the tip edge portion of the driver bit body, The tip portion can be mirror-finished by a required polishing process, and thereafter can be easily carried out by a method of electrodepositing conventionally known diamond abrasive grains.

  As an alternative, the surface of the tip portion of the tip blade portion can be mirror-finished by a required polishing process, and then a diamond film can be grown by a conventionally known CVD method to coat the diamond film. It is.

  Further, when integrally molding with a resin material on the middle part or the other end side part of the driver bit body, the driver bit body is accommodated in a required resin molding die, and the thermoplastic resin material is placed in the resin. The coating can be easily formed by a known extrusion method in which the material is extruded into a mold.

  Therefore, the object of the present invention is to improve the wear resistance as well as the strength against the tip blade part, to absorb excessive torque and impact extremely efficiently, and to have extremely excellent strength and durability. An object of the present invention is to provide a driver bit that can be easily manufactured with a simple configuration.

In order to achieve the above-mentioned object, the driver bit according to claim 1 of the present invention uses a metal material having wear resistance and durability, and is provided with an end portion having an end blade portion (14). (16a), an intermediate portion (16b) including a pair of ears (22a, 22b), and a driver bit body (12) formed with the other end portion (16c),
The entire middle portion (16b) and the other end side portion (16c) except the one end side portion (16a) including the tip blade portion (14) of the driver bit main body (12) are formed into a required resin molding die. And the thermoplastic resin material is extruded into the resin mold and the resin material (20) is integrally coated and molded so as to have a required thickness as a whole.
The tip end portion of the one end side portion (16a) including the tip blade portion (14) has a structure in which the surface thereof is subjected to a mirror finishing process and a diamond coating process.

  The surface of the driver bit according to claim 2 of the present invention, in which the surface finish processing of the tip portion of the one end side portion (16a) including the tip blade portion (14) of the driver bit body (12) is performed, After the electroless nickel plating is applied to the tip blade portion (14), the tip portion including the tip blade portion (14) is subjected to mirror finishing by a required polishing process, and the tip blade The tip portion including the portion (14) has a structure in which diamond abrasive grains are electrodeposited to perform diamond coating processing.

  The surface of the driver bit according to claim 3 of the present invention, in which the surface finish processing of the tip portion of the one end side portion (16a) including the tip blade portion (14) of the driver bit body (12) is performed, The tip portion including the tip blade portion (14) is characterized in that a diamond film is grown by a CVD method and a diamond film is coated.

  According to the driver bit of the present invention, a driver bit using a metal material having wear resistance and durability and having a tip blade portion that fits into a bit fitting groove provided on the top surface of the screw head. A structure in which the intermediate portion including at least the ear portion excluding the tip blade portion of the driver bit main body and the other end side portion are integrally formed with a resin material having a required thickness as a whole with respect to the main body. As a result, the wear resistance of the tip of the driver bit can be improved, excessive torque and impact on the driver bit can be absorbed very efficiently, and the durability of the driver bit can be significantly increased. be able to.

  According to the driver bit of the present invention, it is possible to improve the wear resistance on the tip edge portion of the driver bit and to further increase the strength, and to absorb excessive torque and impact on the driver bit extremely efficiently and to be durable. It is possible to easily obtain an excellent driver bit.

  According to the driver bit of the present invention, when the mirror finish processing is performed on the surface of the tip portion of the tip blade portion, after applying electroless nickel plating to the tip blade portion of the driver bit body, By performing a mirror finish by the required polishing process, and then processing the tip part or tip blade part of the driver bit body by electrodeposition of a conventionally known diamond abrasive grain, it has excellent wear resistance, A driver bit that can increase durability can be easily obtained.

  According to the driver bit of the present invention, after performing a mirror finishing process on the surface of the tip part of the tip part of the driver bit body, the tip part or the tip part of the driver bit body is subjected to a diamond coating process. At this time, a diamond bit film is grown by CVD and the diamond film is coated, whereby a driver bit having excellent wear resistance and durability can be easily obtained.

  According to the driver bit of the present invention, the integral covering molding with a resin material for the intermediate portion and the other end side portion excluding the tip blade portion of the driver bit main body accommodates the driver bit main body in a required resin molding die, By extruding the thermoplastic resin material into the resin mold and integrally coating with the resin material, it is possible to absorb excessive torque and impact very efficiently, and at the same time, wear resistance and durability are remarkably improved. A driver bit that can be increased can be obtained.

  In the present invention, for example, carbon steel, cemented carbide, special alloy steel, stainless steel, etc. may be used as the metal material having required wear resistance and durability constituting the driver bit. In particular, a steel material obtained by rolling chrome vanadium steel, chrome molybdenum steel or the like into a rod shape is used as a constituent material for the driver bit, and it is preferable to use this constituent material and form it appropriately by cutting.

It is a front view which shows one Example of the driver bit which concerns on this invention. It is a top view of the driver bit shown in FIG. It is a bottom view of the driver bit shown in FIG. FIG. 4 is a cross-sectional view of the driver bit according to the present invention taken along line IV-IV in FIG. 3. It is a side view of a driver bit body applied to the present invention. It is a side view which shows another one Example of the driver bit which concerns on this invention.

  Next, embodiments of a driver bit according to the present invention will be described in detail with reference to the accompanying drawings.

  1 to 4 show an embodiment of a driver bit 10 according to the present invention. FIG. 1 is a front view, FIG. 2 is a bottom view, FIG. 3 is a plan view, and FIG. Each shows a sectional view taken along line IV.

  That is, in the driver bit 10 according to the present embodiment, as shown in FIGS. 4 and 5, a rod-shaped driver bit body 12 is formed of a metal material having required wear resistance and durability. The driver bit body 12 made of this metal material is formed with a tip blade portion 14 as a plus-type driver bit, for example, which is formed so as to fit in a bit fitting groove formed in the screw head at one end, and thereafter Up to the end 15, it is configured as a rod-like body having substantially the same outer diameter.

  As shown in FIG. 5, the driver bit main body 12 configured as the rod-shaped body is provided with a slight step portion 13 in a part in the axial direction, and an end portion side portion 16a in which a tip blade portion 14 is formed. On the other hand, the intermediate portion 16b and the other end side portion 16c can be configured to have a slightly larger diameter with the stepped portion 13 as a boundary portion.

  The driver bit main body 12 configured in this way, excluding the tip blade portion 14, slightly exposes the rear end portion 15 of the driver bit main body 12 to the intermediate portion 16b and the other end portion portion 16c, and The driver bit body 12 is accommodated in a required resin molding die (not shown), and the thermoplastic resin material is extruded into the resin molding die so as to be extruded. Is integrally coated.

  In this case, the resin molding die is formed with a pair of ear portions 22a and 22b and an engagement recess 24, which are necessary for detachably mounting the driver bit 10 on, for example, a bit holder of an electric screwdriver. (Refer to FIGS. 1 to 4).

  In this way, the driver bit 10 according to the present embodiment can be easily manufactured with a simple configuration, and in particular, the intermediate portion 16b including at least the ear portion excluding the tip blade portion 14 of the driver bit body 12. And, if necessary, the other end portion 16c is integrally covered with the resin material 20 having a required thickness as a whole, so that excessive torque and impact can be absorbed very efficiently.

  Further, in the driver bit 10 according to the present embodiment, the surface of the tip portion 14a of the tip blade portion 14 is mirror-finished by a required polishing process so that the screw bit is fitted with a screw in a screw tightening operation. It is possible to improve the wear resistance of the tip blade portion 14 by making the sliding good.

  Furthermore, as another example of the driver bit 10 according to the present example, as shown in FIGS. 5 and 6, a required polishing process is performed on the surface of the tip portion 14 a of the tip blade portion 14 in the driver bit 10. After performing the mirror finish processing, the tip portion 14a or the tip blade portion 14 of the driver bit main body 12 can be subjected to diamond coating 18.

  In this case, as shown in FIG. 5, after the electroless nickel plating is applied to the surface of the tip blade portion 14 in the driver bit body 12, the surface of the tip portion 14a is mirror-finished by a required polishing process. After that, a diamond coating 18 is applied to the tip portion 14a or the tip blade portion 14 of the driver bit body 12.

  Therefore, in this embodiment, when the diamond coating 18 is applied to the tip portion 14a or the tip blade portion 14 of the driver bit body 12, the nickel plating layer subjected to the mirror finish processing is disclosed in, for example, The diamond superabrasive grains are firmly fixed by temporarily attaching diamond superabrasive grains by using a known electrodeposition method disclosed in Japanese Patent No. 6-114741 and further growing the plating layer. Diamond coating can be applied.

  As an alternative, when the diamond coating 18 is applied to the tip portion 14a or the tip blade portion 14 of the driver bit body 12, a required polishing process is performed on the surface of the tip portion 14a of the tip blade portion 14. After the mirror finishing process is performed, the diamond coating process 18 can be performed by growing the crystal of diamond and coating the diamond film by a known CVD method disclosed in, for example, Japanese Patent Application Laid-Open No. 2003-175462. .

  Then, the rear end portion 15 of the driver bit body 12 is slightly exposed to the intermediate portion 16b and the other end side portion 16c excluding the tip edge portion 14 of the driver bit body 12 subjected to the diamond coating 18 as described above. Then, as described above, the driver bit body 12 is accommodated in a required resin mold (not shown), and the thermoplastic resin material is extruded into the resin mold so as to be extruded. Are integrally coated with a resin material 20 having a required thickness.

  Therefore, the driver bit 10 according to the present embodiment can be easily manufactured with a simple configuration, and in particular, the wear resistance of the tip blade portion can be improved and the strength can be sufficiently increased. And an advantage that an excessive torque and impact can be absorbed very efficiently can be obtained.

  Therefore, for the driver bit (sample A of the present invention) according to the above-described embodiment, a driver bit (comparative test sample) as a rotary tool in which a metal rod-like body is inserted into a hollow portion of a conventionally proposed tool body. Using the product B) and a commercially available normal driver bit (comparative sample C) as a comparative control, a durability test was conducted in which the screw tightening operation was repeated continuously.

  That is, as the durability test, a 2.5 mm Phillips screw is used, and a sample of a driver bit that is suitable for screw tightening is selected. Screw tightening operation that counts “screw tightening → tightening to specified torque value → screw loosening” as one cycle is repeated until each sample of the driver bit is destroyed. ) Was measured. As a result of repeating the measurement for three screws, the following count numbers (number of times) were recorded.

Invented sample A comparative sample B comparative sample C
Screw (1) 5198 (times) 1404 (times) 2381 (times)
Screw (2) 6099 1830 2927
Screw (3) 8004 1541 2692
・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・
Average value 6433.7 (times) 1591.7 (times) 2666.7 (times)

  From the measurement results, it was confirmed that the driver bit according to this example had the most excellent durability. That is, the driver bit according to the present embodiment is compared with a driver bit (comparative sample B) as a rotary tool in which a metal rod-like body is inserted into a hollow portion of a tool body that has been proposed in the past. It is clear that it has about 3 times durability.

  The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the plus-type driver bit of the above-described embodiment, and the screw having various bit fitting grooves having shapes other than the cross groove. It is possible to adopt a configuration that can be applied as a driver bit having a shape that can be fitted to a bit holder of various driver bodies while having a suitable tip blade portion having various shapes, and various other modifications can be made. .

DESCRIPTION OF SYMBOLS 10 Driver bit 12 Driver bit main body 13 Step part 14 End blade part 14a End part 15 Rear end part 16a One end part 16b Middle part 16c Other end part 18 Diamond coating part 20 Resin material 22a, 22b Ear part 24 Engagement recessed part

Claims (3)

Using an abrasion-resistant and durable metal material, one end side portion (16a) having a tip blade portion (14) and an intermediate portion (16b) including a pair of ear portions (22a, 22b) And a driver bit body (12) formed with the other end portion (16c),
The entire middle portion (16b) and the other end side portion (16c) except the one end side portion (16a) including the tip blade portion (14) of the driver bit main body (12) are formed into a required resin molding die. And the thermoplastic resin material is extruded into the resin mold and the resin material (20) is integrally coated and molded so as to have a required thickness as a whole.
The driver bit according to claim 1, wherein the tip portion of the one end side portion (16a) including the tip blade portion (14) has a structure in which the surface thereof is subjected to a mirror finishing process and a diamond coating process.   The surface of the tip portion of the one end side portion (16a) including the tip blade portion (14) of the driver bit main body (12) subjected to the mirror finish processing is electroless nickel plated on the tip blade portion (14). Is applied to the tip portion including the tip blade portion (14) by a mirror-finishing process by a required polishing process, and further to the tip portion including the tip blade portion (14), 2. The driver bit according to claim 1, wherein the driver bit has a structure in which diamond abrasive grains are electrodeposited and subjected to diamond coating processing. The surface of the tip end portion of the one end side portion (16a) including the tip blade portion (14) of the driver bit body (12) subjected to the mirror finishing process is applied to the tip portion including the tip blade portion (14). On the other hand, the driver bit according to claim 1, wherein a diamond film is grown by a CVD method and a diamond film is coated.

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