Manufacturing method of reamer and cutting workpiece

Abstract

To provide a reamer with high cooling effects due to a coolant.SOLUTION: A non-restricted reamer of one surface of the present disclosure has a rod-shaped body, and a lid body attached to a tip side of the body. The body has an outer peripheral surface, grooves, outer peripheral blades, and an open hole which extends from a rear end toward the tip and opens at the tip side. The lid body has a first hole connected to the open hole and extending toward the tip in the lid body, and a second hole connected to the first hole. The second hole has a connection part connected to the first hole, an injection port positioned on a rear end side of the lid body, and a straight part extending linearly from the connection part to the injection port. The straight part is alienated from a rotation axis when approaching the injection port, and is inclined so as to be directed forward in a rotation direction of the rotation axis.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to a reamer that can be used to enlarge the inner diameter of a hole in a workpiece such as a metal. [Background technology]

[0002] For example, a reamer described in Patent Document 1 is known as a cutting tool used when cutting a workpiece such as metal. The reamer described in Patent Document 1 has a tool body and a cap body. The tool body has an oil hole extending along the rotation axis. A cooling liquid (coolant) is supplied to the tip side through this oil hole. The cap body has a blowing hole. The coolant is sprayed to the outside from the blowing hole and is used to cool the cutting edge. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-114628 Summary of the Invention [Problem to be solved by the invention]

[0004] In the reamer described in Patent Document 1, the coolant sprayed out from the blowing holes is likely to hit the unmachined part of the workpiece or chips, which may result in insufficient coolant being supplied to the vicinity of the cutting edge, resulting in insufficient cooling effect of the coolant. [Means for solving the problem]

[0005] A non-limiting one-sided reamer of the present disclosure has a rod-shaped main body extending from a rear end to a front end along a rotation axis, and a cover attached to the front end side of the main body. The main body has an outer circumferential surface, a groove extending from the front end side to the rear end along the outer circumferential surface, a peripheral cutting edge located at an intersection of the outer circumferential surface and the groove, and a through hole extending from the rear end to the front end and opening on the front end side.

[0006] The lid has a first hole connected to the through hole and extending toward the tip of the lid, and a second hole connected to the first hole. The second hole has a connection part connected to the first hole, an injection port located on the rear end side of the lid, and a straight part extending in a straight line from the connection part to the injection port. The straight part is inclined so as to move away from the rotation axis and toward the front in the rotation direction of the rotation axis as it approaches the injection port. Effect of the Invention

[0007] According to the above reamer, the cooling effect of the coolant is high. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a non-limiting one sided reamer of the present disclosure. [Diagram 2] FIG. 2 is a plan view of the reamer shown in FIG. 1 as viewed from the tip side. [Diagram 3] 2, but showing the second hole and the like in a see-through view. FIG. [Figure 4] FIG. 3 is a side view of the reamer shown in FIG. 2 as viewed from a direction IV. [Diagram 5] 5 is an enlarged view of a region V shown in FIG. 4, showing a second hole and the like in a see-through manner. [Figure 6] 2 is a perspective view of a cover of the reamer shown in FIG. 1, as viewed from the tip side. FIG. [Figure 7] 7 is a perspective view of the cover shown in FIG. 6, seen from the rear end side. [Figure 8]8 is the same perspective view as FIG. 7, showing the second hole and the like. [Figure 9] 7 is a plan view of the cover shown in FIG. 6, seen from the rear end side. [Figure 10] 10 is the same plan view as FIG. 9, but showing the second hole and the like in a see-through view. [Figure 11] 10 is a side view of the cover shown in FIG. 9 as viewed from a direction XI. [Figure 12] 12 is the same side view as FIG. 11, but showing the second hole and the like in a see-through view. [Figure 13] FIG. 4 is a plan view of a non-limiting one-sided reamer of the present disclosure, seen from the tip side, corresponding to FIG. 3. [Figure 14] FIG. 2 is a schematic diagram showing a step in a non-limiting method of manufacturing a one-sided machined product according to the present disclosure. [Figure 15] FIG. 2 is a schematic diagram showing a step in a non-limiting method of manufacturing a one-sided machined product according to the present disclosure. [Figure 16] FIG. 2 is a schematic diagram showing a step in a non-limiting method of manufacturing a one-sided machined product according to the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] <Reamer> Hereinafter, a non-limiting aspect of the reamer 1 of the present disclosure will be described in detail with reference to the drawings. However, in each of the drawings referred to below, for the sake of convenience, only the main members necessary for explaining the embodiment are shown in a simplified form. Therefore, the reamer 1 may include any component member not shown in each of the drawings referred to. Furthermore, the dimensions of the components in each drawing do not faithfully represent the dimensions of the actual components and the dimensional ratios of each component.

[0010] The reamer 1 may have a main body 3 and a cover body 5, as a non-limiting example shown in FIGS.

[0011] The main body 3 may be rod-shaped. The main body 3 may extend from the rear end 3b to the front end 3a along the rotation axis O1. The main body 3 is rotatable around the rotation axis O1. The arrow Y1 in FIG. 1 may indicate the rotation direction of the rotation axis O1.

[0012] Examples of the material of the main body 3 include steel and cemented carbide. When the material of the main body 3 is steel, the main body 3 has high toughness.

[0013] The body 3 may have a shank portion 7 and a cutting portion 9 .

[0014] The shank portion 7 can function as a portion that is gripped by a rotating spindle of a machine tool. The shank portion 7 may be designed according to the shape of the spindle in the machine tool.

[0015] The cutting portion 9 may be located on the tip 3a side relative to the shank portion 7. The cutting portion 9 is capable of contacting the workpiece, and can function as a site that plays a major role in cutting the workpiece (for example, enlarging the inner diameter of a machined hole).

[0016] The size of the main body 3 is not limited to a specific size. For example, the maximum value of the outer diameter D of the cutting part 9 may be set to about 1 to 20 mm. Also, the length L of the cutting part 9 in the direction along the rotation axis O1 may be set to about L=1D to 10D.

[0017] The main body 3 may have an outer peripheral surface 11, a groove 13, an outer peripheral cutting edge 15, and a through hole 17, as shown in a non-limiting example in FIGS.

[0018] The outer peripheral surface 11 may also be referred to as a clearance surface. The outer peripheral surface 11 may also have a margin surface 19 and a clearance surface 21, as shown in a non-limiting example in FIG.

[0019] The margin surface 19 may be located along the groove 13, rearward in the rotation direction Y1 of the rotation axis O1. The margin surface 19 can function as a portion that stabilizes the operability of the reamer 1 by sliding against the inner wall surface of a machined hole in a workpiece.

[0020] The clearance surface 21 may be located along the margin surface 19, rearward in the rotation direction Y1. The clearance surface 21 may be recessed with respect to the margin surface 19. The clearance surface 21 may function as a portion that reduces friction with a workpiece during cutting.

[0021] The groove 13 may extend from the front end 3a toward the rear end 3b along the outer circumferential surface 11. The groove 13 may function as a portion for discharging chips to the outside. The groove 13 may extend parallel to the rotation axis O1, or may extend in a spiral shape around the rotation axis O1. There may be only one groove 13, or there may be multiple grooves 13. When there are multiple grooves 13, the number of grooves 13 may be 2 to 8. The groove 13 may be located in the cutting portion 9.

[0022] The depth of the groove 13 is not limited to a specific value. For example, the depth of the groove 13 may be set to 10 to 40% of the outer diameter of the main body 3 (cutting portion 9). The depth of the groove 13 may be a value obtained by subtracting the distance between the bottom of the groove 13 and the rotation axis O1 from the radius of the main body 3 (cutting portion 9) in a cross section perpendicular to the rotation axis O1. The bottom may be a portion of the groove 13 closest to the rotation axis O1.

[0023] The peripheral cutting edge 15 may be located at the intersection of the peripheral surface 11 and the groove 13. The peripheral cutting edge 15 may function as a part that cuts the workpiece in the cutting process. The number of the peripheral cutting edges 15 may be the same as the number of the grooves 13. The peripheral cutting edge 15 may be located in the cutting portion 9.

[0024] The through hole 17 may extend from the rear end 3b toward the front end 3a and open on the side of the front end 3a. In other words, the through hole 17 may have an opening 23 that extends from the rear end 3b toward the front end 3a and opens on the side of the front end 3a. A coolant supplied from the outside can be flowed through the inside of the through hole 17. The shape of the through hole 17 is not particularly limited as long as it allows the coolant to flow.

[0025] The through hole 17 may open on the rear end 3b side. In other words, the through hole 17 may further have an opening that opens on the rear end 3b side. For convenience, this opening may be called a second opening, and the opening 23 may be called a first opening 23.

[0026] The second opening can function as an inlet for allowing coolant to flow into the through hole 17. The position of the second opening is not particularly limited. For example, as in a non-limiting example shown in FIG. 4, when the main body 3 has an end surface 25 on the rear end 3b side, the second opening may be located at the end surface 25.

[0027] Examples of the coolant include water-insoluble oils and water-soluble oils. Examples of the water-insoluble oils include cutting oils such as oil-based, inactive extreme pressure, and active extreme pressure. Examples of the water-soluble oils include cutting oils such as emulsions, solubles, and solutions. The coolant is not limited to a liquid, and may be a gas such as an inert gas. The coolant may be appropriately selected and used depending on the material of the workpiece.

[0028] The lid 5 may be attached to the tip 3a side of the main body 3. The lid 5 may be attached to the tip 3a side of the main body 3 so as to cover the opening 23 of the through hole 17. The lid 5 can function as a member that controls the direction of the flow of coolant supplied from the main body 3 through the through hole 17.

[0029] The lid 5 may be removably attached. For example, the lid 5 may be attached to the main body 3 by bonding with an adhesive or by press-fitting. Examples of the material for the lid 5 include metal and resin. The maximum value of the outer diameter of the lid 5 may be smaller than the maximum value of the outer diameter of the main body 3 (cutting portion 9). In the direction along the rotation axis O1, the length of the lid 5 may be shorter than the length of the main body 3 (cutting portion 9).

[0030] The cover 5 may have a first hole 27 and a second hole 29, as in a non-limiting example shown in Fig. 5 and Fig. 12. The first hole 27 may be connected to the through hole 17 and may extend toward the tip 5a of the cover 5. The second hole 29 may be connected to the first hole 27. In these cases, it is possible for the coolant supplied from the main body 3 through the through hole 17 to flow through the first hole 27 and then the second hole 29.

[0031] The number of each of the first hole 27 and the second hole 29 may be one or more. When the cover 5 has a plurality of the first holes 27 and the second holes 29, the first holes 27 and the second holes 29 may be positioned at equal intervals around the rotation axis O1, or may be positioned at unequal intervals. When the cover 5 has a plurality of the first holes 27 and the second holes 29, the number of each of the first holes 27 and the second holes 29 may be 2 to 8. The number of each of the first holes 27 and the second holes 29 may be the same as the number of the grooves 13.

[0032] The second hole 29 may have a connection portion 31, an ejection port 33, and a straight portion 35. The connection portion 31 may be a portion connected to the first hole 27. The ejection port 33 may be located on the side of the rear end 5b of the lid 5. The straight portion 35 may be a portion extending in a straight line from the connection portion 31 to the ejection port 33.

[0033] In these cases, the coolant that flows toward the front end 5a through the first hole 27 can be made to flow toward the rear end 5b by the straight portion 35 and can be sprayed to the outside from the nozzle 33. Note that the nozzle 33 may open to include the intersection of the outer circumferential surface 37 of the lid 5 and the end face 39 on the rear end 5b side, as in a non-limiting example shown in Fig. 7 .

[0034] Here, the straight portion 35 may be spaced apart from the rotation axis O1 as it approaches the jet nozzle 33, as in a non-limiting example shown in Figures 5 and 12. Moreover, the straight portion 35 may be inclined so as to face forward in the rotation direction Y1 of the rotation axis O1, as in a non-limiting example shown in Figures 3 and 10.

[0035] In these cases, the coolant is sprayed from the rear to the front in the rotation direction Y1, so the sprayed coolant is not easily affected by unmachined parts or chips. Therefore, the coolant can be easily sprayed onto the surface of the reamer 1 in a stable manner. In other words, the coolant can be easily supplied to the outer circumferential surface 11, etc. Therefore, the reamer 1 has a high cooling effect due to the coolant.

[0036] 3, when the tip of the cover 5 is seen through, the inclination angle θ1 in the rotational direction Y1 at the connection portion 31 may be smaller than the inclination angle θ2 in the rotational direction Y1 at the straight portion 35. In this case, it is easy to avoid a sudden change in the inclination angle in the rotational direction Y1 at the second hole 29.

[0037] The connection part 31 does not have to be inclined with respect to the rotational direction Y1. In other words, the inclination angle θ1 of the connection part 31 with respect to the rotational direction Y1 may be 0°. In this case, the coolant is easily supplied from the first hole 27 to the second hole 29. Also, it is easy to incline the straight part 35 with respect to the rotational direction Y1. When the lid body 5 is seen through the tip, the straight part 35 may be inclined with respect to the connection part 31.

[0038] When evaluating the inclination angle θ1 in the rotation direction Y1 at the connection portion 31, a central axis O2 passing through the center of the connection portion 31 may be used as a reference. Similarly, when evaluating the inclination angle θ2 in the rotation direction Y1 at the straight portion 35, a central axis O3 passing through the center of the straight portion 35 may be used as a reference.

[0039] The inclination angle θ1 and the inclination angle θ2 are not limited to specific values. For example, the inclination angle θ1 may be set to about 0 to 20°. More specifically, the inclination angle θ1 may be set to about 5 to 15°. The inclination angle θ2 may be set to about 0 to 50°. More specifically, the inclination angle θ2 may be set to about 10 to 45°.

[0040] 12, the connection portion 31 may have a first portion 41 and a second portion 43. The first portion 41 may be connected to the first hole 27 and extend from the first hole 27 toward the front end 5a. The second portion 43 may be connected to the first portion 41 and extend from the first portion 41 toward the rear end 5b. In these cases, the supply of coolant from the first hole 27 to the second hole 29 is likely to proceed smoothly.

[0041] The length of the straight portion 35 may be the same as or different from the length of the connection portion 31. For example, as in a non-limiting example shown in Figures 10 and 12, the straight portion 35 may be longer than the connection portion 31. In this case, the direction in which the coolant is sprayed is likely to be stable.

[0042] The cover 5 may further have a recess 45, as in a non-limiting example shown in Fig. 7. The recess 45 may be located on the rear end 5b side, and the first hole 27 may open. The recess 45 may open in the end face 39 on the rear end 5b side.

[0043] 12, the recess 45 may have a first portion 47 and a second portion 49. The first hole 27 may open into the first portion 47. The second portion 49 may be located closer to the rear end 5b than the first portion 47, and may have a smaller inner diameter than the first portion 47.

[0044] The main body 3 may further have a protrusion 51, as in a non-limiting example shown in Fig. 5. The protrusion 51 may be located on the side of the tip 3a, and the through hole 17 may open therein. When the main body 3 has the protrusion 51, the top of the protrusion 51 may be the tip 3a of the main body 3.

[0045] The protruding portion 51 may have a third portion 53 and a fourth portion 55. The third portion 53 may be located on the side of the front end 3a. The fourth portion 55 may be located on the side of the rear end 3b relative to the third portion 53, and may have an outer diameter smaller than that of the third portion 53.

[0046] The third portion 53 may be located in the first portion 47. Furthermore, the fourth portion 55 may be located in the second portion 49. In these cases, the cover body 5 is less likely to come off from the main body 3 when the reamer 1 is used.

[0047] The body 3 may further include a leading edge 57 and a leading clearance surface 59, as shown in one non-limiting example in FIGS.

[0048] The tip blade 57 may be connected to the peripheral blade 15 on the tip 3a side, and may approach the rotation axis O1 as it moves away from the peripheral blade 15. The length of the tip blade 57 may be shorter than the length of the peripheral blade 15.

[0049] The tip flank 59 may be located along the tip cutting edge 57 at the rear in the rotation direction Y1. Similarly to the outer circumferential surface 11, the tip flank 59 may have a margin surface 61 and a clearance surface 63.

[0050] Next, a non-limiting aspect of the reamer 1A of the present disclosure will be described with reference to Fig. 13. Below, differences between the reamer 1A and the reamer 1 will be mainly described, and detailed descriptions of the same configurations as the reamer 1 may be omitted.

[0051] In the reamer 1A, as in a non-limiting example shown in Fig. 13, the central axis O3 passing through the center of the straight portion 35 may intersect with the tip flank 59. In this case, the coolant can be caused to flow to the tip flank 59, so that the cooling effect of the tip cutting edge 57 is high. The central axis O3 may intersect with the margin surface 61 of the tip flank 59.

[0052] <Method of manufacturing machined products> Next, a non-limiting method for manufacturing the one-sided machined product 101 according to the present disclosure will be described with reference to FIGS.

[0053] The machined product 101 may be produced by cutting a workpiece 103. A manufacturing method of the machined product 101 may include the following steps. (1) rotating a reamer 1, as typified by the non-limiting embodiment described above, along a rotation axis O1; (2) contacting the reamer 1 with the workpiece 103; (3) removing the reamer 1 from the workpiece 103; may have the following structure:

[0054] Specifically, first, the reamer 1 may be brought relatively close to the workpiece 103 while rotating in the Y1 direction along the rotation axis O1, as in a non-limiting example shown in Fig. 14. Next, the peripheral cutting edge 15 may be brought into contact with the workpiece 103 to cut the workpiece 103, as in a non-limiting example shown in Fig. 15. Then, the reamer 1 may be moved relatively away from the workpiece 103, as in a non-limiting example shown in Fig. 16.

[0055] By going through the above-mentioned steps, it is possible to obtain a machined product 101 having a highly accurate finished surface. Specifically, when the reamer 1 is used in the manufacturing method of the machined product 101, the cooling effect of the coolant is high, so that excellent workability can be exhibited. As a result, it is possible to obtain a machined product 101 having a highly accurate finished surface.

[0056] In the non-limiting example shown in Figs. 14 to 16, the workpiece 103 is fixed and the reamer 1 is moved in each step, but the present invention is not limited to this embodiment.

[0057] For example, in step (1), the workpiece 103 may be brought closer to the reamer 1. Similarly, in step (3), the workpiece 103 may be moved away from the reamer 1. When continuing the cutting process, the reamer 1 may be kept rotating and the step of bringing the peripheral cutting edge 15 into contact with different locations of the workpiece 103 may be repeated.

[0058] Examples of the material of the workpiece 103 include carbon steel, alloy steel, stainless steel, cast iron, and non-ferrous metals.

[0059] 14 to 16, the reamer 1 is used, but the present invention is not limited to this. For example, the reamer 1A may be used instead of the reamer 1. [Explanation of symbols]

[0060] 1 Reamer 3. Main unit 3a...Tip 3b...rear end 5. Cover 5a...Tip 5b...rear end 7. Shank section 9...Cutting part 11...Outer surface 13...Groove 15...Peripheral blade 17...Through hole 19. Margin surface 21 Clearance surface 23...Aperture 25...end face 27...1st hole 29...2nd hole 31 Connection 33...Injection port 35...Straight section 37...outer surface 39...end face 41... Part 1 43...2nd part 45 Recess 47...Part 1 49...Second part 51... Convex part 53...3rd part 55...4th part 57 Tip blade 59 Tip flank 61...Margin surface 63 Clearance Surface 101...Cutting workpiece 103...Work material O1 Rotation axis O2...center axis O3...center axis Y1 Rotation direction

Claims

1. A rod-shaped main body extending from a rear end to a front end along a rotation axis; a cover attached to the main body on the side of the tip, The body includes: The outer periphery and a groove extending along the outer circumferential surface from the front end toward the rear end; a peripheral cutting edge located at an intersection of the peripheral surface and the groove; a through hole extending from the rear end toward the front end and opening on the front end side, The lid body is A first hole connected to the through hole and extending toward a tip of the lid; a second hole connected to the first hole, The second hole is A connection portion connected to the first hole; An injection port located on the rear end side of the lid body; a straight portion extending in a straight line from the connection portion to the injection port, The straight portion is inclined so as to move away from the rotation shaft and toward a front in a rotation direction of the rotation shaft as the straight portion approaches the injection port.

2. The reamer according to claim 1 , wherein, when the tip of the cover is seen through, an inclination angle of the connection portion in the rotational direction is smaller than an inclination angle of the straight portion in the rotational direction.

3. The reamer according to claim 2 , wherein the connecting portion is not inclined with respect to the rotation direction.

4. The connection portion is a first portion connected to the first hole and extending from the first hole toward the tip; The reamer according to any one of claims 1 to 3, further comprising: a second portion connected to said first portion and extending from said first portion toward said rear end.

5. The body includes: a tip blade connected to the peripheral blade at the tip side and approaching the rotation shaft as it moves away from the peripheral blade; A tip flank surface is located along the tip cutting edge at a rear side in the rotation direction, The reamer according to any one of claims 1 to 4, wherein a central axis passing through a center of said straight portion intersects with said tip flank surface.

6. The reamer according to any one of claims 1 to 5, wherein the straight portion is longer than the connecting portion.

7. the cover further has a recess located on the rear end side and into which the first hole opens, The recessed portion is a first portion in which the first hole opens; a second portion located closer to the rear end than the first portion and having an inner diameter smaller than that of the first portion, The main body further has a protrusion located on the tip side and into which the through hole opens, The protrusion is A third portion located on the tip side; a fourth portion located closer to the rear end than the third portion and having an outer diameter smaller than that of the third portion, The reamer of any one of claims 1 to 6, wherein said third portion is located in said first portion and said fourth portion is located in said second portion.

8. Rotating the reamer according to any one of claims 1 to 7 along the rotation axis; contacting the reamer with a workpiece; and removing the reamer from the workpiece.

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