JP3932529B2 - Round bar-shaped rotary cutting tool material and its manufacturing method - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a material for a round bar-shaped rotary cutting tool and a method for manufacturing the same, and more specifically, a round bar-shaped material for a rotary cutting tool in which a hole for cooling and chip discharge medium is formed in a spiral shape. It relates to the manufacturing method.
[0002]
[Prior art]
As is well known, there is a drill as one of the tools using a round bar-shaped rotary cutting tool material, and there are many methods for manufacturing the drill. Generally, the drill is extruded into a round bar shape by an extruder, and in the subsequent process. A method of making a drill product by adding a drill groove to a sintered product in a round bar shape that has been sintered in accordance with product requirements has been performed. In this case, the one with two holes through which the liquid for cooling and chip discharge medium can flow out is the same, but since the two holes are formed in the round bar, the round bar-shaped firing is performed prior to drilling the groove. The lead of the material for the rotary cutting tool is measured.
[0003]
Hereinafter, this point will be briefly described with reference to FIGS. 9 to 11 showing the prior art. When the raw materials and the necessary auxiliaries are introduced into the extruder 101 as shown by arrow A as shown in FIG. The raw material is extruded while being rotated by the spiral groove 103 formed on the inner peripheral surface of the extrusion nozzle 102 of the machine 101 to obtain a round bar-shaped rotary cutting tool material B, and the spiral lead groove is formed on the outer peripheral surface 104 thereof. 105 is formed. In addition, spiral holes 107 and 108 for cooling and chip discharging medium are also formed inside the two-hole forming jig 106. Thereafter, the round bar-shaped rotary cutting tool material B is sintered to become a rotary cutting tool material.
[0004]
In the above, the length of the round bar-shaped rotary cutting tool material during one rotation of the spiral lead groove 105 on the outer peripheral surface of the round bar-shaped rotary cutting tool material B and the inner two spiral holes 107 and 108 is made. The length in the direction (the distance traveled by being extruded by the extruder) is usually referred to as a lead L.
The lead L may differ slightly for each rod depending on the state of the raw material, the operation mode of the extruder, the temperature of the surrounding environment, the humidity, and the like.
[0005]
By the way, when the drill groove processing is performed to process the drill using the round bar-shaped material B for the rotary cutting tool, the leads L are recognized one by one as described above. This is done by recognizing the lead groove 105 on the outer peripheral surface 104 of the round cutting tool material B.
That is, it is performed by recognizing the length between the end points where the lead groove 105 makes one rotation with an arbitrary point of the lead groove 105 as a starting point. In other words, it is possible to measure the lead L by recognizing the length of the round bar-shaped material for rotary cutting tool B corresponding to the prescribed number of the lead grooves 105 between the starting point a and the ending point b when viewed from a certain side. It is done. In FIG. 9, when one rotation is made from the starting point a to the ending point b of the lead groove 105 on the outer periphery 104, the lead L is the length between a and b, and the number of the lead grooves 105 viewed from a certain side surface therebetween. In the example shown in the figure, there are 12 leads, and this is one lead, and the two holes 107 and 108 for cooling and chip discharge medium rotate in one lead. That is, if one lead is measured with reference to the lead groove 105 of the outer peripheral surface 104, one lead is measured with reference to the inner two holes 107 and.
[0006]
If a circular groove-like rotary cutting tool material B is subjected to drill groove processing based on this one lead L, two holes 107 and 108 are exposed in the processed groove 109 when a drill C is formed as shown in FIG. It does not become a defect that would cause a failure, that is, a defective drill. That is, if the groove is formed based on the lead L from the state in which the opening ends of the two cooling and chip discharging medium holes 107 and 108 face each other in the center region, The two holes 107 and 108 are not exposed inside. On the other hand, if the groove L is formed on the round bar-shaped rotary cutting tool material B without measuring the lead L, the positions of the two spiral cooling and chip discharging medium holes 107 and 108 inside A part of the two holes 107 and 108 may be exposed at a position where the groove 109 is formed by being overlapped with the position of the groove 109 of the drill groove processing, resulting in a defective drill.
For this reason, it is necessary to always measure the lead L of the round rod-shaped rotary cutting tool material B prior to drilling the groove, and this measurement of the lead L is an important quality control item in drilling. ing.
[0007]
By the way, the measurement of the lead L of the conventional round bar-shaped rotary cutting tool material B has been performed as follows.
That is, the lead groove 105 is uniformly formed on the outer peripheral surface of the round bar-shaped rotary cutting tool material B as shown in FIG. 9 or FIG. 10, and is distinguished by a certain position as a mark from the outside. It is not supposed to be.
Therefore, when measuring the lead L, magic ink is applied to a certain lead groove 105 to be the starting point a, and the prescribed number of the lead groove 105 as viewed from the side is counted. Magic ink was applied at the end point b, and the distance between the magic ink mark at the start point a and the magic ink mark at the end point b was measured as a lead L. Alternatively, as another method, the magic ink is applied along one lead groove 105 before the lead measurement, and then the lead L is set between the starting point a and the end point b where the magic ink is applied.
[0008]
[Problems to be solved by the invention]
In this way, it takes a lot of time to measure the lead L, and it is easy to make an erroneous measurement, and it is necessary to remove the mark of the applied magic ink after processing the drill groove.
[0009]
【the purpose】
Accordingly, an object of the present invention is to provide a material for a round bar-shaped rotary cutting tool that can easily measure a lead prior to drill grooving and a method for manufacturing the same. More specifically, the present invention provides a material for a round bar-shaped rotary cutting tool that can immediately recognize a lead by visual inspection without counting the number of lead grooves formed on a peripheral surface, and a manufacturing method thereof. Therefore, the quality of the rotary cutting tool material is easy to control, and the material for the rotary cutting tool can ultimately contribute to improving the efficiency of drill grooving as one of the tools that use the round bar-shaped rotary cutting tool material. And providing a method for producing the same.
[0010]
[Means for solving the problems]
In order to achieve the above object, the present invention has the following technical means. That is, this will be described using the reference numerals in the accompanying drawings corresponding to the embodiments. In the present invention, the raw material X and the necessary auxiliary agent are extruded by the extruder 1, and a plurality of spiral shapes are formed on the outer peripheral surface 4 by the extrusion molding. In the round bar-shaped rotary cutting tool material Y in which the two lead grooves 5 are formed and the spiral two-hole cooling and chip discharging medium holes 7 and 8 are formed therein, the outer peripheral surface 4 The cross-sectional shape of any one formation position of the plurality of lead grooves 5 or a plurality of formation positions including the one is different from the cross-sectional shape of each part position of the remaining lead groove 5. This is a material for a round bar-shaped rotary cutting tool.
[0011]
Further, according to the present invention, the cross-sectional shape of an arbitrary one of the plurality of lead grooves 5 on the outer peripheral surface 4 or a plurality of formation positions including the one is formed so that the lead grooves 5 are formed at the positions. It is a material for a rotary cutting tool that has a groove-less cross-sectional shape due to the absence of the portions 10 and 20, thereby being different from the groove-shaped cross-sectional shape of each part of the remaining lead groove 5.
[0012]
Further, according to the present invention, the cross-sectional shape of an arbitrary one of the plurality of lead grooves 5 on the outer peripheral surface 4 or a plurality of formation positions including the one is the groove 30 in which the lead groove 5 of the part is wide. Thus, the material of the rotary cutting tool is different from the narrow cross-sectional shape of each part of the remaining lead groove 5.
[0013]
In addition, according to the present invention, the cross-sectional shape of any one of the plurality of lead grooves 5 on the outer peripheral surface 4 or the plurality of formation positions including the one is such that the lead groove 5 in the portion is the deep groove 40. As a result, the material of the rotary cutting tool is different from the cross-sectional shape of the shallow groove of each part of the remaining lead groove 5.
[0014]
And the manufacturing method of the raw material for a round bar-shaped rotary cutting tool according to the present invention is as follows. Extrude while rotating,
Thereby, a spiral lead groove 5 is formed on the outer peripheral surface 4 of the round bar-shaped rotary cutting tool material Y, and the round bar-shaped rotary cutting tool material Y is formed by a two-hole forming jig 6 provided in the extruder. A plurality of spiral grooves 3 formed on the inner peripheral surface of the extrusion nozzle 2 in the manufacturing method of the round bar-shaped rotary cutting tool material in which the spiral cooling and chip discharging medium holes 7 and 8 are formed inside. The cross-sectional shape of any one forming position or a plurality of forming positions including the one is made different from the cross-sectional shape of the remaining spiral groove 3, and the round bar-shaped rotary cutting tool material Y extruded by the above-described extrusion is used. The cross-sectional shape of the lead groove 5 at the position corresponding to the spiral groove 3 with the different cross-sectional shape of the outer peripheral surface 4 is different from the cross-sectional shape of each part of the remaining lead groove 5, and a round bar-shaped rotary cutting tool material Y is manufactured. To be done A.
[0015]
[Action]
According to the inventions related to the round bar-shaped rotary cutting tool material, when attention is paid to the lead groove 5 of the round bar-shaped rotary cutting tool material, the portion having a different cross-sectional shape as compared with the normal lead groove 5 is from the side. Even when viewed, the discrimination is immediately visible, and the distance between the portions having different cross-sectional shapes is 1 lead L. That is, the portions 10 and 20 where the lead groove 5 is not formed are not clearly present when viewed from the side of the round bar-shaped rotary cutting tool material Y, as compared with the place where the normal lead groove 5 exists. The portion 10, 20 where the lead groove 5 is not formed is rotated once in ab from the place 10, 20 where the lead groove 5 is not present to the next place 10, 20 along the longitudinal direction. Becomes the lead L. The same applies when the lead groove 5 is wide 30 or deep groove 40.
Therefore, the lead of the round bar-shaped rotary cutting tool material Y can be recognized without counting the number of the lead grooves 5 one by one, the lead measurement is quick, and the quality control of the round bar-shaped rotary cutting tool material is easy. Therefore, the efficiency of drill grooving as one of the tools that use a round bar-shaped rotary cutting tool material is improved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described in detail with reference to FIGS.
1 to 3 show a first embodiment, which will be described with reference to these drawings. A raw material and a necessary auxiliary agent X are charged into the extruder 1.
Then, when passing through the extrusion nozzle 2, the raw material is extruded while being forced to rotate by the spiral groove 3 formed on the inner peripheral surface thereof. This is the same as the prior art. Accordingly, a plurality of lead grooves 5 are formed in a spiral shape on the outer peripheral surface 4 of the round bar-shaped raw material for rotary cutting tool Y to be extruded. Further, the two-hole forming jig 6 forms the two spiral holes for cooling and chip discharge medium holes 7 and 8 inside.
[0017]
In the present embodiment, in this case, one spiral groove 3 on the inner peripheral surface of the extrusion nozzle 2 is removed.
In this way, a portion 10 without the lead groove 5 is formed on the outer peripheral surface 4 of the round bar-shaped rotary cutting tool material Y to be extruded. The portion 10 without the lead groove 5 and the portion 10 without the next lead groove 5 along the longitudinal direction of the round bar-shaped rotary cutting tool material Y, that is, between the points a and b in FIG. That is, when the portion 10 without the lead groove 5 formed as a result of the removal of the spiral groove 3 is rotated once, the portion 10 without the next lead groove is formed, and the lead L is formed therebetween.
[0018]
As shown in FIG. 2, the cross-sectional shape of the portion 10 without the lead groove is the same as the arc of the outer peripheral surface 4, and the lead groove 5 portion clearly has a groove-like cross section. Therefore, when the round bar-shaped rotary cutting tool material Y is viewed from the side, it can be immediately discriminated visually.
[0019]
Therefore, if a drill groove is added to the round rod-shaped rotary cutting tool material Y after sintering based on the lead L as in the prior art, the drill Z is processed as shown in FIG. There is no possibility that the two holes 7 and 8 for cooling and chip discharging medium are exposed in the groove 9.
Therefore, the lead L can be measured quickly and without error. For this reason, quality control of the round bar-shaped rotary cutting tool material is facilitated, and the efficiency of drilling as one of the tools using the round bar-shaped rotary cutting tool material is good.
[0020]
4 and 5 show a second embodiment. In the first embodiment, one of the lead grooves 5 is eliminated, and the portion without the lead grooves 5 is formed on the outer circumferential surface 4 of the round bar-shaped rotary cutting tool material Y. In this embodiment, two spiral grooves 3 of the dice 2 are removed and two of the lead grooves 5 are removed. Even in the case of this example, the lead between the portions 20 without the lead groove 5, that is, between a and b becomes leads.
In the case of this embodiment, since the raw material X is rotated, a plurality of the lead grooves 5 are removed within a range in which the raw material for the round bar-shaped rotary cutting tool can be extruded, and a portion 20 without the lead grooves 5 that can be visually confirmed is formed. The same effect as that of the first embodiment is exhibited.
[0021]
6, 7 and 8 show a third embodiment of the present invention. The examples of FIGS. 6 and 7 are examples in which the width of any one of the lead grooves 5 is widened, It is attached. Further, the example of FIG. 8 is an example in which any one depth of the lead groove 5 is a deep groove 40.
In the case of the example of FIGS. 6 and 7, a lead between the lead groove 5 of the wide groove 30 and the lead groove 5 of the next wide groove 30 is a lead. Also in this example, the lead groove 5 of the wide groove 30 out of the plurality of lead grooves 5 can be easily confirmed visually by making the cross-sectional shape different from that of the other lead grooves 5, so that the lead measurement is extremely easy. It becomes.
In the case of the example of FIG. 8, the cross-sectional shape of the portion where the groove is the deep groove 40 is different from that of the other lead groove 5, and as a result, when the round bar-shaped rotary cutting tool material Y is viewed from the side, Compared to other normal lead grooves 5, the color looks slightly darker, so that it can be distinguished sufficiently. Therefore, the lead can be easily measured by visually recognizing the lead groove 5 of the deep groove 40 and the lead groove 5 of the next deep groove 40 along the longitudinal direction of the round bar-shaped rotary cutting tool material Y. .
[0022]
【effect】
As described above in detail, according to the first aspect of the present invention, prior to drilling, the round bar-shaped rotary cutting tool material Y having holes for cooling and chip discharge medium formed and sintered by an extruder is prior to drilling. When measuring the lead L, it is possible to easily find a portion where the cross-sectional shapes of the plurality of lead grooves are different from each other, so that the lead can be measured at a glance.
For this reason, quality control of the material for the round bar-shaped rotary cutting tool can be performed easily and accurately, and the efficiency of drill groove processing can be improved.
[0023]
Further, according to the invention described in claim 5, a round bar-shaped rotary cutting tool material capable of exhibiting the above advantages can be efficiently manufactured.
[0024]
Furthermore, according to each invention of Claims 2-4, the raw material for round bar-shaped rotary cutting tools which is easy to embody the said advantage can be provided.
[Brief description of the drawings]
FIG. 1 shows a first embodiment of the present invention and is a diagram for explaining extrusion molding of a material for a round bar-shaped rotary cutting tool shown in a simplified manner.
FIG. 2 is a cross-sectional view taken along line 2-2 of FIG.
FIG. 3 is a view showing a drill obtained from the material for the round bar-shaped rotary cutting tool shown in FIGS. 1 and 2;
FIG. 4 shows a second embodiment of the present invention and is an extrusion-molded material for a round bar-shaped rotary cutting tool.
5 is a cross-sectional view taken along line 5-5 of FIG.
FIG. 6 shows a third embodiment of the present invention, and is a view of an extruded round bar-shaped rotary cutting tool material.
7 is a cross-sectional view taken along line 7-7 of FIG.
FIG. 8 is a view similar to FIG. 7 showing a fourth embodiment of the present invention.
FIG. 9 is a diagram illustrating extrusion molding of a material for a round bar-shaped rotary cutting tool, which shows a conventional technique and is simply shown.
10 is a cross-sectional view taken along line 10-10 of FIG.
11 is a view of a drill obtained by using the round bar-shaped rotary cutting tool material shown in FIGS. 9 and 10. FIG.
[Explanation of symbols]
X Raw material Y Round bar-shaped rotary cutting tool material Z Drill L Lead between la and b 1 Extruder 2 Extrusion nozzle 3 Spiral groove 4 Outer periphery 6 Cooling and chip discharge medium hole forming jigs 7 and 8 Cooling and cutting Powder discharge medium hole 9 Spiral groove removed portion 10 Lead groove free portion 11 Drill groove processed groove 20 Lead groove free portion 30 Wide lead groove 40 Deep groove lead groove

Claims (5)

The raw material X and the necessary auxiliary agent are extruded by the extrusion molding machine 1, and a plurality of spiral lead grooves 5 are formed on the outer peripheral surface 4 by the extrusion molding. In the round rod-shaped rotary cutting tool material Y in which the discharge medium holes 7 and 8 are formed, any one formation position of the plurality of lead grooves 5 on the outer peripheral surface 4 or a plurality of them including the one. A material for a round bar-shaped rotary cutting tool, wherein the cross-sectional shape of the forming position is different from the cross-sectional shape of each portion of the remaining lead groove 5. The cross-sectional shape of an arbitrary one of the plurality of lead grooves 5 on the outer peripheral surface 4 or a plurality of formation positions including the one is the portions 10 and 20 where the lead grooves 5 are not formed at the positions. The material for a rotary cutting tool according to claim 1, wherein the material has a groove-less cross-sectional shape by being different from the groove-shaped cross-sectional shape of each part of the remaining lead groove 5. The cross-sectional shape of an arbitrary one of the plurality of lead grooves 5 on the outer peripheral surface 4 or a plurality of formation positions including the one is such that the lead groove 5 in that portion is a wide groove 30. The material for a rotary cutting tool according to claim 1, wherein the remaining lead groove 5 is different from the narrow cross-sectional shape of each part of the lead groove 5. The cross-sectional shape of any one of the plurality of lead grooves 5 on the outer peripheral surface 4 or a plurality of formation positions including the one is such that the lead groove 5 of the portion is a deep groove 40. 2. The material for a rotary cutting tool according to claim 1, wherein the remaining lead groove is different from the cross-sectional shape of the shallow groove in each part of the lead groove. The raw material X and the necessary auxiliary agent are charged into the extrusion molding machine 1 and extruded while rotating the raw material through a plurality of spiral grooves 3 formed on the inner peripheral surface of the extrusion nozzle 2, thereby forming a round bar-shaped rotary cutting tool material Y A spiral lead groove 5 is formed on the outer peripheral surface 4 of the steel plate, and a spiral cooling and chip discharge is performed inside the round bar-shaped rotary cutting tool material Y by a two-hole forming jig 6 provided in the extruder. In the manufacturing method of the round rod-shaped rotary cutting tool material for forming the medium holes 7 and 8, any one of the plurality of spiral grooves 3 formed on the inner peripheral surface of the extrusion nozzle 2 or the position thereof The cross-sectional shape of a plurality of forming positions including one is made different from the cross-sectional shape of the remaining spiral groove 3, and the cross-sectional shape of the outer peripheral surface 4 of the round bar-shaped rotary cutting tool material Y extruded by the extrusion is made different. Spira A round bar-like rotary cutting tool characterized in that a round bar-like rotary cutting tool material Y is produced in which the cross-sectional shape of the lead groove 5 at a position corresponding to the groove 3 is different from the cross-sectional shape of each part of the remaining lead groove 5 The manufacturing method of materials.

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