JP3165636U - Structure that increases the drill head strength of step drills and improves chipping - Google Patents

Abstract

An object of the present invention is to provide a structure capable of improving the drill head strength of a step drill conforming to the concept of ecology required in modern processes and improving chipping. A structure capable of increasing the strength of a drill head and improving chipping of a step drill includes a cutting portion having a tapered shape, and a drill portion provided at a vertex end of the cutting portion. When the drill part 11 is worn and chipped, it can be connected to the apex end in a timely manner or separated from the apex end of the cutting part 10. Can be used continuously and its service life can be extended, and there is no need to replace the entire step drill 1. Therefore, there is no need for any economical burden for replacing, replacing, or renewing the drill head. [Selection diagram] Fig. 1

Description

  The present invention relates to a drill head of a cutting drill, and more particularly to a structure capable of increasing the drill head strength of a step drill and improving the chipping situation.

  When a hole or a large-diameter round hole is formed on a thin plate, a drill head of a type such as a step drill or a round-hole drill has been conventionally employed to process a hole having a necessary diameter.

  As shown in FIG. 6, the step drill is provided with a few nodes on the tapered cutting portion 5, has a step shape, and has a form in which the blade portion 50 on the surface is gradually moved. Moreover, on the taper-shaped cutting part 5, at least two waste guide tanks 51 that extend spirally from the bottom edge of the cutting part 5 and reach the top end of the cutting part 5 are formed. A pointed cone surface 52 is formed at the apex end of the cutting portion 5, thereby expanding the cutting stress of the drill. When the cutting part 5 rotates at a high speed, the blade part 50 and the pointed cone surface 52 drill the workpiece, and the waste generated by the cutting work is quickly discharged by the waste guide tank 51.

However, in general, when performing drill cutting, due to factors such as excessive wear of the blade portion 50, inappropriate operation of the user, or careless contact with the conical surface 52, and the hardness of the work property, Non-uniform cutting stress often results. As a result, when cutting proceeds, the blade portion 50 or the conical surface 52 is likely to be damaged or chipped, and the blade portion is worn out. Since the pointed cone surface 52 is integrally formed with the cutting portion 5, if a phenomenon such as breakage or chipping occurs in the blade portion 50 or the pointed cone surface 52, the entire drill head must be replaced. This puts too much money on the economy and does not match the ecological thinking required in modern processes.
The present invention has been made in view of the above-described drawbacks of the drill head of a conventional step drill.

  An object of the present invention is to provide a structure that can increase the drill head strength of a step drill that can reduce the purchase cost of the drill head and improve chipping.

In order to solve the above-described object, the present invention provides a structure capable of increasing the drill head strength of the following step drill and improving chipping. The structure that can increase the drill head strength of a step drill and improve chipping has a tapered cutting part and a drill part installed at the top end of the cutting part, and a few nodes are installed on the cutting part. , Stepwise, stepping around the cutting edge of the surface step by step, at least two scrap guides extending on the cutting portion in a spiral shape from the bottom edge of the cutting portion and reaching the top end of the cutting portion Forming a bath, the shape of the drill portion is similar to a single knot length blade portion formed at the apex end of the cutting portion, and can be joined to the apex end of the cutting portion in a timely manner, or It can isolate | separate from this cutting part vertex end.
A connection installation port is opened at the top end of the cutting portion, a pin connection port leading to the connection installation port is opened at a predetermined position on the surface of the cutting portion, and the connection installation port is formed at the rear end of the drill portion. A screw pin is formed on the inner edge of the pin connection port, and a localization pin for setting a thread portion corresponding to the screw pin portion on the surface is placed in the pin connection port of the cutting unit, The joining rod is firmly tightened, whereby the drill portion is stably fixed and positioned at the apex end of the cutting portion.

  The structure that can increase the drill head strength and improve chipping of the step drill of the present invention is that the drill part is replaced in a timely manner in the present invention even when wear and chipping appear on the apical surface where the work is drilled. It is possible to realize the continuous use of the step drill and extend its service life, and there is no need to replace the entire step drill, so there is no need to replace the drill head, replace it, or buy it again. In addition, it matches the concept of ecology required in modern processes.

It is a three-dimensional view of the first embodiment of the present invention. It is an assembly drawing of the first embodiment of the present invention. It is sectional drawing of this invention 1st Example. It is an assembly drawing of the second embodiment of the present invention. It is sectional drawing of this invention 2nd Example. It is a three-dimensional figure of the conventional structure.

  In order to describe in detail the technical contents, structural features, and objects to be achieved of the present invention, examples will be described below in combination with the drawings.

  As shown in FIG. 1 which is a three-dimensional view of the first embodiment of the present invention, FIG. 2 which is an assembled view, and FIG. 3 which is a sectional view, a step drill 1 of the present invention includes a cutting portion 10 having a tapered shape, and a cutting portion. A drill portion 11 is provided which is connected to the top of the ten apexes and can be separated and replaced at appropriate times.

  On the cutting part 10, a few nodes are installed, stepped, and the blade part 100 on the surface goes around step by step. On the cutting part 10, at least two scrap guide tanks 101 extending in a spiral shape from the bottom edge of the cutting part 10 through the blade part 100 to reach the top end of the cutting part 10 are formed. At the apex end of the cutting part 10, a connection installation port 102 having a slightly elliptical shape is opened inward. A pin connection port 103 that leads to the inside of the connection installation port 102 is opened at a predetermined position on the surface of the cutting unit 10. On the inner edge of the pin connection port 103, a threaded portion 104 is formed.

  The size of the bottom edge of the drill part 11 and the top edge of the cutting part 10 are similar. The shape of the drill portion 11 is similar to the blade portion 100 having a single node length h1 formed at the apex end of the cutting portion 10. A pointed cone surface 110 is formed at the apex end of the drill portion 11 for convenience of cutting the work article. On the surface of the drill part 11, a waste guide tank 111 that extends from the waste guide tank 101 at the apex end of the blade part 100 and is molded is installed. At the rear end of the drill portion 11, a joining rod 112 that extends rearward and whose cross section corresponds to the outer edge of the connection installation port 102 of the cutting portion 10 is installed. On the joining rod 112, a contact control surface 113 having a flat face is installed.

  At the time of assembly, the joining rod 112 of the drill part 11 is extended into the connection installation port 102 of the cutting part 10, whereby the contact control surface 113 of the joining rod 112 and the pin connection port 103 are opposed to each other. Further, the stereotaxic pin 3 for setting the thread portion 30 corresponding to the screw yama portion 104 on the surface is inserted into the pin connection port 103 of the cutting portion 10. The localization pin 3 is localized in the pin connection port 103 by a screw connection operation between the threaded portion 104 of the pin connection port 103 and the thread portion 30 of the localization pin 3. At the same time, contact control is performed on the contact control surface 113 of the joining rod 112 so that the joining rod 112 is firmly tightened so that it does not come loose. Thereby, the drill part 11 is stably fixed and positioned at the apex end of the cutting part 10, and forms the first knot structure of the blade part 100. In this way, by applying the pointed cone surface 110 to the drilling work, the waste generated by drilling the work is quickly discharged through the waste guide tanks 101 and 111.

  When the pointed cone surface 110 of the drill unit 11 is worn and chipped, the user separates the drill unit 11 from the connection installation port 102 of the cutting unit 10 and replaces it with a new drill unit 11 for installation. can do. Thus, continuous use can be achieved and the service life of the step drill can be extended.

  As described above, even when wear or chipping appears on the apical surface 110 where the work is drilled, the present invention enables continuous use of the step drill 1 by simply replacing the drill unit 11 in a timely manner. In addition, the service life can be extended. That is, since it is not necessary to replace the entire step drill 1, there is no need for an economic burden for exchanging, replacing, or increasing the drill head, and it is in conformity with the ecological concept required in modern processes.

  As shown in FIG. 4 which is a three-dimensional view of the second embodiment of the present invention and FIG. 5 which is an assembly view, the structure of the second embodiment is similar to the structure of the first embodiment. It is similarly provided with a cutting part 20 having a tapered shape and a drill part 21 which is coupled to the apex end of the cutting part 20 and can be separated and exchanged in a timely manner.

  On the cutting part 20, the blade part 200 and the waste guide tank 201 are installed. A connection installation port 202 is opened at the apex end of the cutting unit 20. A pin connection port 203 that opens to the inside of the connection installation port 202 is opened at a predetermined position on the surface of the cutting unit 20. A pointed cone surface 210 is formed at the apex end of the drill portion 21. A joining rod 211 corresponding to the connection installation port 202 is installed at the rear end of the drill unit 21. On the joining rod 211, a flat, face-like contact control surface 212 is installed.

  The shape of the drill portion 21 is similar to the blade portion 200 having a length h2 of about two nodes formed at the apex end of the cutting portion 20. Therefore, on the condition that the overall length and the bottom edge are homologous, the length of the drill portion 21 of the second embodiment is longer by the h1-h2 unit length than the drill portion 11 of the first embodiment. . Moreover, the drill section 21 bottom edge cross section and the cutting section 20 apex edge section are larger than the drill section 11 and the cutting section 20 of the first embodiment. Therefore, the thickness from the inner edge of the connection installation port 202 to the surface of the cutting part 20 can be made thicker than the thickness from the inner edge of the connection installation port 102 to the surface of the cutting part 10. Thereby, the rigidity of the second embodiment is higher than that of the first embodiment, and the structural strength when the cutting portion 20 and the drill portion 21 are coupled can be increased. In this way, it is possible to avoid the occurrence of a situation in which the top end of the cutting portion 20 is affected by external stress through the drill portion 21 and is distorted, deformed, torn, or damaged.

  What has been described above is only an example of the present invention, and does not limit the scope of the present invention.Equivalent changes and modifications that can be made based on the claims of the utility model registration of the present invention are all included. It shall belong to the scope covered by the rights of the present invention.

DESCRIPTION OF SYMBOLS 1 Step drill 10 Cutting part 100 Blade part 101 Scrap guide tank 102 Connection installation port 103 Pin connection port 104 Screw part 11 Drill part 110 Tip cone surface 111 Scrap guide tank 112 Joining rod 113 Contact control surface 2 Step drill 20 Cutting part 200 Blade Part 201 Scrap guide tank 202 Connection installation port 203 Pin connection port 204 Screw part 21 Drill part 210 Pointed cone surface 211 Joining rod 212 Contact control surface 3 Positioning pin 30 Thread part 4 Positioning pin 40 Thread part 5 Cutting part 50 Blade part 51 Scrap Guide tank 52 Apical surface

Claims (6)

A cutting portion having a taper shape, and a drill portion installed at the top end of the cutting portion,
On the cutting part, a few nodes are installed, exhibiting a step shape, round the blades on the surface step by step, and extending on the cutting part in a spiral form from the bottom edge of the cutting part, Forming at least two waste guide tanks reaching the top end of the cutting part;
The shape of the drill part is similar to a blade part having a single knot length formed at the apex end of the cutting part, and can be coupled to the apex end of the cutting part in a timely manner, or the apex end of the cutting part A structure that can increase the drill head strength of a step drill and improve chipping, which can be separated from The structure capable of increasing the drill head strength of the step drill and improving the chipping includes a cutting portion having a tapered shape, and a drill portion installed at the top end of the cutting portion,
On the cutting part, a few nodes are installed, exhibiting a stepped shape, stepping around the blade part on the surface, and extending on the cutting part in a spiral form from the bottom edge of the cutting part, Forming at least two waste guide tanks reaching the top end of the cutting part;
The shape of the drill portion is similar to a blade portion having a length of two nodes formed at the apex end of the cutting portion, and can be coupled to the apex end of the cutting portion in a timely manner, or the apex end of the cutting portion A structure that can increase the drill head strength of a step drill and improve chipping, which can be separated from In the structure capable of increasing the drill head strength of the step drill according to claim 1 or 2 and improving chipping, a connection installation port is opened at the top end of the cutting part,
In a predetermined position on the surface of the cutting part, a pin connection port leading to the connection installation port is opened,
A structure capable of increasing the drill head strength of the step drill and improving the chipping, wherein a joining rod corresponding to the connection installation port is installed at the rear end of the drill part. The structure which can raise the drill head intensity | strength of a step drill of Claim 3, and can improve a chipping, The screw pin part is formed in the said pin connection port inner edge, The stereotactic pin which installs the thread part corresponding to the said screw pin part on the surface In the pin connection port of the cutting part, tighten the joining rod firmly,
Accordingly, the drill portion is stably fixed and positioned at the apex end of the cutting portion, and the structure can increase the drill head strength of the step drill and improve the chipping.   5. A structure capable of increasing the drill head strength and improving chipping of the step drill according to claim 4, wherein a contact control surface having a flat face is provided on the joining rod, whereby the positioning pin is connected to the contact control surface. A structure that increases the drill head strength and improves chipping of a step drill. In the structure capable of increasing the drill head strength of the step drill according to claim 1 or 2 and improving chipping, a pointed cone surface is formed at the apex end of the drill part,
A structure capable of increasing the drill head strength of the step drill and improving the chipping is provided on the surface of the drill part by installing a waste guide tank that extends from the waste guide tank at the top end of the blade part and molds.

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