JP2522665Y2 - Internal pin mirror cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a pin mirror cutter for cutting a pin portion of a crankshaft, and particularly to a cutting blade in a state where a cooling medium is not in contact with a cutting blade and a workpiece. The present invention relates to an internal pin mirror cutter for preventing the generation of heat.

[Prior Art] FIGS. 3 and 4 show a conventional internal pin mirror cutter 1a (hereinafter referred to as a pin mirror cutter).
1a). Pin mirror cutter 1a is the cutter body 2a
And a plurality of cutting blades 4a radially arranged along the inner periphery thereof
It is composed of

FIGS. 5 and 6 are views for explaining a method of cutting the pin portion 19 of the crankshaft 18 supported by the spindle center 22 and the tailstock center 23 by the pin mirror cutter 1a. The width dimensions of the cutter body 2a and the cutting blade 4a are exactly the same as the axial length of the pin portion 19,
4a is brought into full contact with the pin portion 19 and cut by a cutting method such as plunge cutting. That is, as shown in FIGS. 5 and 6, the pin mirror cutter 1a is arranged around the pin portion 19 to be cut. Pin mirror cutter
1a is connected to a cutter drive system 21 via a cutter holder 20, and the cutter drive system 21 rotates C in the reverse direction (arrow A in FIG. 6) by a drive mechanism and a control mechanism (not shown).
It is configured to reciprocate (up and down) in the −C direction (FIG. 6). By rotating the crankshaft 18 in the normal direction (arrow B in FIG. 6) and reciprocating the pin mirror cutter 1a in synchronization with the movement trajectory of the pin portion 19 eccentrically moving, the pin portion 19 becomes a cutting edge. It is cut by 4a.

Japanese Utility Model Laid-Open Publication No. Sho 62-15412 shows a crankshaft mirror having substantially the same shape as the pin mirror cutter 1a. Although this publication is a technology that is not directly related to the present invention described later, it discloses a mechanical structure for cutting a pin portion of a crankshaft by the crankshaft mirror. The content is almost the same as the method described with reference to FIGS. 5 and 6, and the pin portion is processed by reciprocating in the Y direction (perpendicular to the paper) while rotating the cutter of the crankshaft mirror. It is specified to do.

[Problem to be Solved by the Invention] The case where the pin portion 19 is processed by the pin mirror cutter 1a shown in FIGS. 3 and 4 or the crankshaft mirror disclosed in Japanese Utility Model Laid-Open No. 62-15412. When processing the pin part by cutting, the chips generated by cutting
And the inner periphery of the pin mirror cutter 1a or the like, and the discharge thereof is not performed smoothly. The cutting chips are heated to a high temperature, and the cutting chips 4a are heated to a high temperature by contacting the cutting chips with the cutting blades 4a and the like. Of course, the cutting blades 4a and the like are cooled by the supply of the cutting oil, but the cutting oil often does not directly reach the cutting blades 4a, and the cooling of the cutting blades 4a and the like often becomes insufficient. The cutting edge 4a is generally formed from a chip, and when the chip is heated to a high temperature, a heat crack easily occurs. Therefore, there is a problem that the cutting blade 4a and the like are damaged. In addition, the crankshaft 18 itself is thermally deformed by the heat of the cutting chips, thereby lowering the processing accuracy and possibly causing a defective product.

Generally, a method of cooling around the cutting edge is employed as a means for preventing high-temperature heating of the cutting edge.

Japanese Utility Model Application Laid-Open No. 61-159125 shows one example. This publication does not cool the cutting blade 4a of the pin mirror cutter, but shows a cooling structure around the cutting blade in the face mill cutter. That is, in the cutter body of the face mill cutter disclosed in this publication, an oil passage is formed which is bored and opened from its center toward each blade (corresponding to a cutting blade) of the cutter. The oil supply hole of the cutter spindle fitted at the center of the nozzle is connected to the oil passage, and the cutting oil is jetted to the cutting blade to cool the cutting blade. However, in the above oil cooling method, the cutting oil gushes outward from the center side of the face mill cutter, and centrifugal force acts on the jetted cutting oil. Is done. Therefore, there arises a problem that the periphery of the workpiece is stained, oil adheres to the workpiece unnecessarily and becomes dirty, and chips are attached. In addition, chips are mixed into the cutting oil in the process of jetting and scattering the cutting oil. for that reason,
There is a problem that a post-processing operation for cleaning the workpiece and the cutting oil is required. Further, as other similar known techniques, there are Japanese Utility Model Laid-Open No. 1-81208, Japanese Utility Model Publication No. 63-22924, and Japanese Patent Application Laid-Open No. 57-149112. This also has a problem that the cooling medium is jetted to the cutting blade side and contaminates the cutting edge and the workpiece, and the flowing of the cooling medium causes waste and dirt of the cooling medium, and also has the same problem as the above-described known technology. There is.

The present invention solves the above-mentioned problems.Therefore, the cooling medium does not contact the cutting edge and the workpiece, so that there is no contamination of the workpiece, no chips are mixed in the cooling medium, and a filter or the like is used during regeneration. No filtering means is required, there is almost no post-treatment for cleaning the workpiece and cutting oil, and there is no waste of cooling medium due to run-off, the cutting edge is sufficiently cooled, and heat cracks and breakage are reliably prevented. In addition, an object of the present invention is to provide an internal pin mirror cutter capable of improving the processing accuracy while reducing the thermal deformation of the processed member.

[Means for Solving the Problems] In order to achieve the above object, the present invention reciprocates in a radial direction while reversing a ring-shaped cutter body in which cutting blades are radially implanted along an inner circumference. A pin mirror cutter for processing a pin portion of a crankshaft of a workpiece that moves and rotates forward, wherein an annular passage is provided along a circumferential direction on a cutting blade side in the cutter body and the cutter body is provided in the cutter body. An internal pin mirror cutter comprising a supply-side fluid passage and a discharge-side fluid passage which communicates with the annular passage and is directly connected to the cooling medium supply source side is provided.

[Operation] The cooling oil from the cooling medium supply source is directly introduced into the supply-side fluid passage provided in the cutter body. The cooling medium enters an annular passage provided on the cutting blade side in the cutter body along the circumferential direction, indirectly cools the cutting blade, and then supplies the cooling medium through a discharge-side fluid passage in the cutter body. Circulation is returned directly to the source side. The circulating use of the cooling medium as described above sufficiently cools the cutting edge, suppresses a rise in the temperature of the cutting edge and each part, and prevents the cooling medium from coming into contact with the cutting edge and the workpiece. No points occur.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, an internal pin mirror cutter 1 (hereinafter, referred to as a pin mirror cutter 1) includes a first cutter body 2, a second cutter body 3, and a cutting blade 4.
And so on. The first cutter main body 2 has an inner peripheral portion 5 on which the outer periphery of the second cutter main body 3 is fitted and an inner peripheral portion 6 on which the cutting blade 4 is implanted formed on an inner surface, and a first cutter main body 2 has an A stepped portion 7 for fitting a cutter holder 20 (FIG. 5) of a cutter drive system 21 for rotating and reciprocating the first cutter body 2 is formed. On the other hand, the second cutter main body 3 is formed of a ring-shaped member, and is inserted into the first cutter main body 2 from the side thereof to a position flush with the first cutter main body 2 as described above, and is fixed by the bolt 9. Further, an inner peripheral portion 8 on which the cutting blade 4 is implanted is formed. The inner diameters of the inner peripheral portion 6 and the inner peripheral portion 8 are formed to have the same dimensions.

The cutting blades 4 are alternately implanted in the inner peripheral portions 6, 8 of the first cutter main body 2 and the second cutter main body 3, and are radially arranged along the inner periphery as shown in FIG. The blade tips are arranged on the same inner circumference circle, and the second is formed.

An annular passage 10 is recessed at a position near the cutting edge 4 on a side surface of the first cutter body 2 that contacts the second cutter body 3.

A supply-side fluid passage 11 and a discharge-side fluid passage 12 are provided inside the first cutter body 2 with an appropriate gap therebetween, and each has one end connected to the annular passage 10 and the other end connected to the second passage. An opening is formed on the outside of the first cutter body 2 to form an inlet 13 and an outlet 14, respectively. Note that a blind plug 15 is provided in the annular passage 10 between the supply-side fluid passage 11 and the discharge-side fluid passage 12 so as not to be short-circuited via the annular passage 10. Also, the first cutter body 2 is provided with macula plugs 16 and 17 as shown in FIGS. 1 and 2.
This prevents the cooling medium in the fluid passage from leaking from the opening of the machining hole, which was necessary for forming the supply-side fluid passage 11 and the discharge-side fluid passage 12 in the first cutter body 2. It is for doing.

 Next, the operation of the embodiment will be described in more detail.

The cooling medium sent from a cooling medium supply source (not shown) is directly introduced into the inlet 13 provided in the first cutter body 2 via the cutter driving system 21. The cooling medium passes through the supply-side fluid passage 11 and is introduced into the annular passage 10. The cooling medium that has cooled the cutting blade 4 while circulating in the annular passage 10 enters the discharge-side fluid passage 12, is discharged from the outlet 14, and returns to the cooling medium supply source via the cutter drive system 21. After being cooled and re-cooled, it is recycled.

Since the low-temperature cooling medium passes through the annular passage 10 disposed relatively close to the cutting edge 4, the heat of the cutting edge 4 is absorbed by the cooling medium, and the cutting edge 4 is cooled. Therefore, heat cracks of the chips and the like are prevented, and thermal deformation of the crankshaft 18 is also prevented.

In the present embodiment, the annular passage 10 is provided only on the first cutter main body 2 side, but it may be provided on the second cutter main body 3 or may be formed so as to extend between them. Further, although only one annular passage 10 is provided in the present embodiment, a plurality of annular passages 10 may be provided as long as they do not interfere with the bolt 9. In the present embodiment, the cutter body is divided to form the annular passage 10, and the first cutter body 2 and the second cutter body 3 are combined. However, the cutter body is formed by casting or the like. In this case, the annular passage 10 can be formed at the time of molding, and the cutter body may be formed into an integral structure without being divided.

According to the present invention, the following remarkable effects are obtained.

1) The cooling medium is supplied directly from the cooling medium supply source to the supply-side fluid passage in the cutter body, indirectly cools the cutting edge while circulating in the annular passage, and then supplies the cooling medium directly from the discharge-side fluid passage. With the structure being returned to the source side, the cooling medium does not contact the cutting edge and the workpiece. For this reason, chips are not mixed into the cooling medium, and there is no need to filter with a filter during regeneration. Further, since there is no run-off, there is no waste of the cooling medium, and the contamination of the cooling medium is reduced. Therefore, the post-processing work for cleaning the workpiece and the cooling medium is almost unnecessary.

2) A cooling medium is supplied into an annular passage in the cutter body close to the cutting blade, and the cutting medium is sufficiently cooled even if the cutting blade is heated by high-temperature chips to absorb and remove the heat of the cutting blade. Cracks are reliably prevented from occurring.

3) Unlike the prior art, the cooling medium does not spill out of the cutter body, so that the surroundings of the workpiece are not stained by the cutting oil.

4) In the present invention, the shape of the cutter body is not greatly changed from the conventional one, and the formation of the annular passage and the fluid passage is not particularly difficult, and can be carried out simply and inexpensively.

5) The thermal deformation of the workpiece is small, and the processing accuracy can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of one embodiment of the present invention, and FIG.
2 is a sectional view taken along the line II-II, FIG. 3 is a plan view of the conventional pin mirror cutter, FIG. 4 is a sectional view taken along the line IV-IV of FIG. 3, and FIG. FIG. 6 is a side view showing the combined state, and FIG. 6 is a plan view for explaining the movement of the pin mirror cutter during processing. DESCRIPTION OF SYMBOLS 1 ... Internal pin mirror cutter (pin mirror cutter), 2 ... 1st cutter main body, 3 ... 2nd cutter main body, 4 ... Cutting blade, 5, 6, 8 ... Inner peripheral part, 7 ... … Stepped part, 9
…… bolt, 10 …… annular passage, 11 …… supply side fluid passage,
12 ... discharge side fluid passage, 13 ... inlet part, 14 ... outlet part,
15,16,17 …… Metal plug, 18 …… Crankshaft, 19…
... Pin part, 20 ... Cutter holder, 21 ... Cutter drive system,
22 ... Spindle center, 23 ... Tailstock center.

Claims (1)

(57) [Scope of request for utility model registration] 1. A ring-shaped cutter body in which cutting blades are implanted radially along an inner circumference is reciprocated in a radial direction while rotating in reverse, and a pin portion of a crankshaft of a workpiece which rotates forward is machined. A supply mirror fluid, comprising: a pin mirror cutter, wherein an annular passage is provided along a circumferential direction on a cutting edge side in the cutter body and communicates with the annular passage in the cutter body to directly connect to a cooling medium supply source side. An internal pin mirror cutter comprising a passage and a discharge-side fluid passage.