JP5534173B2 - Multistage reamer - Google Patents

Description

  The present invention relates to a multistage reamer, and more particularly, to a multistage reamer having a coolant hole.

  For example, multi-stage holes that require extremely high machining accuracy, such as injector holes in engine cylinder heads, are often finished with pre-processed pilot holes by a multi-stage reamer. An example of such a multistage reamer is described in Patent Document 1. Incidentally, some reamers have a coolant hole for supplying coolant for cooling and lubrication to the blade portion. In general, the coolant hole in the reamer extends from the axis of the reamer to the tip side with a predetermined inclination angle (for example, 45 °) with respect to the axis (for example, see Patent Document 2). Generally, in a multistage reamer having coolant holes, coolant holes are provided corresponding to the blade portions of each stage. Conventionally, the coolant holes corresponding to the blade portions of each stage are formed in the same direction, that is, at the same inclination angle with respect to the axis of the reamer.

  However, when the above-described conventional multi-stage reamer is used, cutting waste generated by cutting the second-stage blade portion from the tip of the reamer is injected from a coolant hole opened on the machining surface of the second-stage blade portion. The coolant is carried to the tip side of the reamer, that is, the first stage blade part side. When the cutting waste generated by cutting the second stage blade part enters between the first stage blade part and the finished surface finished by the first stage blade part, the first stage blade Scratches occur on the finished surface finished by the part, and the accuracy required for the finished surface cannot be ensured. Then, the cutting waste generated by cutting the third-stage blade portion from the tip of the reamer is sprayed from the coolant hole opened in the machining surface of the third-stage blade portion, so that the tip side, that is, the second step The same problem occurs when it is carried to the eye blade side.

JP 2004-195572 A JP 2000-176739 A

  Then, this invention is made | formed in view of the said situation, and it is made as a subject to provide the multistage reamer which prevented the fall of the processing precision of the hole resulting from the cutting waste produced by the cutting of the blade part of another step. It is a thing.

In order to solve the above-described problems, the multi-stage reamer of the present invention is formed along a plurality of blade portions whose blade diameter increases stepwise from the tip of the reamer toward the shank, and along the axis of the reamer. A multi-stage reamer having a plurality of coolant holes extending from a coolant supply path and opening in a corresponding machining surface of the blade portion, wherein a coolant injection direction is open in the machining surface of the blade portion in a different stage. Unlike between the coolant hole that, the direction in which the coolant is injected toward the tip side of the reamer, the direction in which the coolant is injected toward the shank of the reamer, the radius the coolant of the reamer The direction of jetting in the direction is selected .

(Aspect of the Invention)
In the following, aspects of the invention that is recognized as being capable of being claimed in the present application (hereinafter referred to as claimable invention) will be exemplified, and each exemplified aspect will be described. Here, as in the claims, each aspect is divided into paragraphs, numbers are assigned to the respective paragraphs, and the descriptions of other paragraphs are cited as necessary. This is for the purpose of facilitating the understanding of the claimable invention, and is not intended to limit the combination of the constituent elements constituting the claimable invention to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiment, etc., and as long as the interpretation is followed, another aspect is added to the aspect of each section. Moreover, the aspect which deleted the component from the aspect of each term can also be one aspect of the claimable invention.
In the following items, each of items (1) to (3) corresponds to each of claims 1 to 3 described in the claims.

(1) A plurality of blade portions whose blade diameter increases stepwise from the tip of the reamer toward the shank side, and a machining surface of the corresponding blade portion extending from a coolant supply path formed along the axis of the reamer a multi-stage reamer having a plurality of coolant holes which open, into the injection direction of the coolant depends among coolant hole opened on the processed surface of the blade portion of the different stages, directed coolant toward the distal end of the reamer A multi-stage reamer , wherein a direction in which the coolant is injected toward the shank side of the reamer and a direction in which the coolant is injected in a radial direction of the reamer are selected .
According to the multistage reamer described in this section, depending on the machining accuracy required for each hole machined by the blade part of each stage, the groove space for discharging cutting waste, etc., the machining surface of each blade part The injection direction of the coolant that is injected from the coolant hole that opens to the top can be set. Here, the coolant injection direction can be rephrased as the direction in which the coolant hole extends from the reamer axis or the angle formed by the coolant hole with respect to the reamer axis.
Further, according to the multi-stage reamer described in this section, the reamer is produced by cutting the chips generated by cutting the blades at each stage according to the machining accuracy required for each hole processed by the blade at each stage. It can be discharged to the tip side or shank side.
In the aspect of this section, the multi-stage reamer is intended for, for example, a gun reamer having two or more blade portions, a reamer with a tip blade, and the like, and the number of blades is not limited to a single blade, a three blade, a four blade, or the like. . In the case of a multistage reamer having three or more blade portions, it is not always necessary to open a coolant hole on the processing surface of all the blade portions. For example, the processing of the first blade portion on the most distal side is performed. A coolant hole may be opened on the surface and the machining surface of the second stage blade adjacent to the surface, and the coolant hole may not be opened on the machining surface of the third stage blade.

( 2 ) The multi-stage reamer according to (1) , in which the coolant injection direction is set in the opposite direction between the coolant holes opened in the machining surface of the blade portion of the adjacent step.
According to the multistage reamer described in this section, cutting waste generated by cutting can be discharged in opposite directions between adjacent blade portions.

( 3 ) A coolant hole for injecting coolant toward the distal end side of the reamer is opened on the processing surface of the first-stage blade portion on the most distal end side among the multiple-stage blade portions. The multi-stage reamer of (1) and (2) has a coolant hole in which coolant is injected toward the shank side of the reamer.
According to the multi-stage reamer described in this section, the cutting waste generated by cutting with the first-stage blade portion is transferred to the tip end side of the reamer, and the cutting waste generated by cutting the second-stage blade portion is transferred to the reamer shank side. Each can be discharged. As a result, the cutting waste generated by the cutting of the second-stage blade portion enters between the first-stage blade portion and the finished surface finished by the first-stage blade portion. Generation | occurrence | production of the damage | wound of the finishing surface finished by the blade part of an eye can be avoided, and the processing precision of the hole finished by the blade part of the 1st step | stage can be ensured.
In the aspect of this section, in the case of a multi-stage reamer having a three-stage blade portion, the coolant from the coolant hole opened in the processing surface of the third-stage blade portion is sprayed in the shank direction or the radial direction of the reamer. It is desirable to configure so that cutting waste generated by cutting with the blade part of the eye is not discharged to the tip side of the reamer, that is, the second blade part side.

  ADVANTAGE OF THE INVENTION According to this invention, the multistage reamer which prevented the fall of the processing precision of the hole resulting from the cutting waste by the cutting blade of the blade part of another step can be provided.

It is a front view of the multistage reamer of this embodiment.

  An embodiment of the present invention will be described with reference to FIG. The multistage reamer 1 according to this embodiment includes a body 2 and a shank 3. The body 2 has a plurality of blade diameters that gradually increase in diameter from the tip side (left side in FIG. 1, hereinafter referred to as the tip side) of the multistage reamer toward the shank 3 side (right side in FIG. 1, hereinafter referred to as the shank side). The blade portions 4a, 4b, and 4c are provided in three stages (three stages in this embodiment). Each of the blade portions 4a, 4b, 4c of each step is provided with one processing surface 6a, 6b, 6c having cutting blades 5a, 5b, 5c, respectively. That is, the multistage reamer 1 of this embodiment is classified into a single-blade reamer. Of the plurality of blade portions 4a, 4b, 4c, the machining surface 6a of the first blade portion 4a (first blade portion) formed on the most distal end side is provided with an axis O (hereinafter referred to as an axis O) of the multistage reamer 1. 1, extending from the coolant supply path 7 extending along the axis O) toward the distal end, in other words, in a diagonally downward left direction in FIG. A coolant hole 8a extending in the direction of forming the opening is opened.

  Further, the machining surface 6b of the second blade portion 4b (second-stage blade portion) adjacent to the first blade portion 4a is directed from the coolant supply path 7 in the opposite direction to the coolant hole 8a, that is, toward the shank side. In other words, a coolant hole 8b is opened that extends obliquely downward to the right in FIG. 1, and further extends in a direction that forms an inclination angle of 45 ° with respect to the axis O toward the shank side. Further, on the processing surface 6c of the third blade portion 4c (third blade portion) formed on the most shank side, the radial direction of the multistage reamer 1 from the coolant supply path 7, in other words, the lower side in FIG. A coolant hole 8c that extends in the direction and further in a direction that forms an inclination angle of 90 ° with respect to the axis O is opened. Therefore, in this embodiment, the cutting waste generated by the cutting with the cutting blade 5a of the first blade portion 4a is caused by the coolant sprayed from the coolant hole 8a that opens in the processing surface 6a of the first blade portion 4a. It is configured to be discharged in the left direction in FIG.

  Further, the cutting waste generated by the cutting with the cutting edge 5b of the second blade portion 4b is caused by the coolant sprayed from the coolant hole 8b opened in the processing surface 6b of the second blade portion 4b in the shank direction (rightward direction in FIG. 1). ) Is discharged. Furthermore, the cutting waste generated by the cutting with the cutting edge 5c of the third blade portion 4c is transferred to the axial feed of the multistage reamer 1 by the coolant sprayed from the coolant hole 8c opened in the processing surface 6c of the third blade portion 4c. Accordingly, it is configured to be discharged in the shank direction (right direction in FIG. 1) together with the cutting waste generated by the cutting by the cutting blade 5b of the second blade portion 4b.

  Next, the operation of this embodiment will be described. Here, the case where the injector hole (multistage hole) of the cylinder head of the engine is reamed (finished) using the multistage reamer 1 of the present embodiment will be described. Of the injector holes, the processing accuracy required for the first hole (first step hole) processed by the first blade 4a is a tolerance of +0.015 to 0 with respect to an inner diameter of 7.7 mm, and surface accuracy Ra0. The processing accuracy required for the second hole (second step hole) processed by the second blade 4b is a tolerance of +0.4 to -0.15 with respect to an inner diameter of 10.5 mm, and a surface accuracy of Ra0. The processing accuracy required for the third hole (third step hole) processed by the third blade 4c is tolerance +0.1 to -0.1 with respect to the inner diameter of 22.3 mm, and the seating surface accuracy Ra1. .25.

  First, the multistage reamer 1 is mounted on a spindle of a processing machine such as a machining center. An aluminum alloy work (cylinder head) fixed by a jig is attached to the table of the processing machine. In this state, when the machining program is cycle-started, the multistage reamer 1 is positioned coaxially with respect to the pilot hole of the injector hole formed in the workpiece by axial movement. After the positioning is completed, the multistage reamer 1 that rotates at the set rotational speed is cut and fed in the direction of the axis O at the set feed speed. Thereby, the first hole, the second hole, and the third hole of the prepared holes are the cutting edge 5a and the second cutting edge part 4b (the second cutting edge part) of the first cutting edge part 4a (first cutting edge part) of the multistage reamer 1. Cutting blade 5b) and third cutting edge portion 4c (third-stage blade portion). During cutting, the coolant sprayed from the respective coolant holes 8a, 8b, 8c reduces the friction between the respective cutting edges 5a, 5b, 5c and the surface to be processed (prepared hole), and cools them.

  And in this embodiment, the cutting waste produced by cutting with the cutting blade 5a of the first blade portion 4a during cutting is caused by the coolant sprayed from the coolant hole 8a that opens in the processing surface 6a of the first blade portion 4a. It is discharged to the tip side (left side in FIG. 1). Further, the cutting waste generated by the cutting with the cutting edge 5b of the second blade portion 4b is caused on the shank side (right side in FIG. 1) by the coolant sprayed from the coolant hole 8b opened on the processing surface 6b of the second blade portion 4b. Is discharged. Furthermore, the cutting waste generated by the cutting with the cutting edge 5c of the third blade portion 4c is caused by the coolant sprayed in the radial direction of the reamer 1 from the coolant hole 8c opened in the processing surface 6c of the third blade portion 4c. Along with the axial feed of the multi-stage reamer 1, it is discharged to the shank side (right side in FIG. 1) together with the cutting waste generated by cutting by the cutting blade 5b of the second blade portion 4b.

This embodiment has the following effects.
According to this embodiment, the injection direction of the coolant sprayed from the coolant hole 8b that opens in the machining surface 6b of the second blade portion 4b (second-stage blade portion) is set to the first blade portion 4a (first-stage blade portion). Cutting is performed by the cutting blade 5b of the second blade portion 4b because it is set in the opposite direction (shank side) to the injection direction (tip side) of the coolant sprayed from the coolant hole 8a opened in the machining surface 6a of the blade portion). With the coolant injected from the coolant hole 8b opened in the processing surface 6b of the second blade portion 4b, the cutting waste generated by the above can be discharged in the opposite direction to the tip side, that is, the shank side. Thereby, the cutting waste generated by the cutting with the cutting blade 5b of the second blade portion 4b enters between the adjacent first blade portion 4a and the finished surface finished by the first blade portion 4a. The resulting finished surface can be prevented from being scratched, and the required hole machining accuracy can be ensured.
Moreover, the coolant hole 8b which opens to the processing surface 6b of the 2nd blade part 4b is made into the injection direction of the coolant injected from the coolant hole 8c which opens to the processing surface 6c of the 3rd blade part 4c (3rd blade part). Is set in a direction different from the coolant injection direction, that is, in the radial direction of the multistage reamer 1, the cutting waste generated by the cutting by the cutting blade 5 c of the third blade portion 4 c is removed from the third blade portion 4 c. The coolant sprayed from the coolant hole 8c opened in the processing surface 6c can be discharged to the shank side together with the cutting waste generated by the cutting by the cutting blade 5b of the second blade portion 4b with the axial feed of the multistage reamer 1. it can. Thereby, the cutting waste generated by the cutting by the cutting blade 5c of the third blade portion 4c enters between the adjacent second blade portion 4b and the finished surface finished by the second blade portion 4b. The resulting finished surface can be prevented from being scratched, and the required hole machining accuracy can be ensured.

In addition, embodiment is not limited above, For example, you may comprise as follows.
The present embodiment can be applied to any type of multi-stage reamer such as a gun reamer or a chip reamer. The number of blades of the multi-stage reamer can be one blade, three blades, four blades, six blades, or the like.
The inclination angle of the coolant hole with respect to the axis O of the multistage reamer is not limited to 45 °, 90 °, etc., and can be appropriately designed as necessary. Moreover, the coolant to be used may be oily or water-based.

1 Multi-stage reamer, 3 shank, 4a, 4b, 4c Blade part, 5a, 5b, 5c Cutting edge, 6a, 6b, 6c Work surface, 8a, 8b, 8c Coolant hole

Claims (3)

A plurality of blade portions whose blade diameter increases stepwise from the tip of the reamer toward the shank side, and a machining surface of the corresponding blade portion extending from a coolant supply path formed along the axis of the reamer. A multi-stage reamer having a plurality of coolant holes opened,
The direction of coolant injection is
Unlike between the coolant bore which opens into the working surface of the blade portion of the different stages,
A direction in which the coolant is injected toward the tip side of the reamer, a direction in which the coolant is injected toward the shank side of the reamer, and a direction in which the coolant is injected in a radial direction of the reamer. A multi-stage reamer characterized by being selected . Between the coolant bore which opens into the working surface of the blade portion of the adjacent stages, the multi-stage reamer of claim 1, the injection direction of said coolant, characterized in that it is set in the opposite direction. The coolant hole for injecting the coolant toward the distal end side of the reamer opens on the machining surface of the first-stage blade portion on the most distal end side of the plurality of blade portions, and the second stage 3. The multistage reamer according to claim 1, wherein the coolant hole into which the coolant is sprayed opens toward the shank side of the reamer.

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