JP2010000520A - Cutting device for protrusion of unfinished casting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a cutting device for protrusions of an unfinished casting capable of smoothly cutting the protrusions such as a feeder head and a sprue protruded from a surface even when the material of the casting is soft. <P>SOLUTION: The unfinished casting 20 having the protrusions 22 such as the feeder head and the sprue protruded from the surface is fixed to a work support base 2, and a circular rotary cutter 10 rotatable around an axis in parallel with the protruding direction of the protrusions is arranged at a tool support base 5. The rotary cutter has blade bases protruding outward in a radial direction and recesses recessed inward in the radial direction which are alternately formed at an outer circumference of a circular metal substrate 11, and has flat blade type main chips made of a super-hard material and protective protrusions regulating the bite amount of the edge at the edge side part of the main chip under a predetermined value which are arranged at intervals in a circumferential direction at the blade bases. One of the work support base and the tool support base is moved in a direction orthogonal to the protruding direction of the protrusions so that the protrusions are cut by the rotary cutter. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  TECHNICAL FIELD The present invention relates to a projection cutting apparatus for a rough casting that cuts projections such as feeders and gates present in a rough casting taken out from a mold.

  There existed patent document 1 as a prior art. In other words, a cutting blade made of a disc-shaped grindstone is attached to a rotary shaft that is moved up and down by an elevating unit, and a workpiece (coarse and rough) is connected to a jig that moves in a direction perpendicular to the rotary shaft. Casting) and lowering the cutting blade to the cutting position by the elevating part, and then moving the workpiece in the direction of the cutting blade via a jig, thereby cutting the gate with the cutting blade, the gate and the gate Have been removed from the product section.

Since the cutting blade of Patent Document 1 is a disc-shaped grindstone, if the workpiece is a soft material such as an aluminum alloy, clogging may occur, cutting performance may deteriorate, or the workpiece may burn. Met.
JP 2005-349399 A

  An object of the present invention is to provide a projection cutting device for a rough casting that stably cuts a projection such as a feeder or pouring gate that protrudes from the surface even if the casting material is soft.

The present invention is configured as follows to achieve the above object. That is, the invention according to claim 1 fixes a rough casting having protrusions such as feeders and pouring gates on the surface of the work support, and the tool support is centered on an axis parallel to the protruding direction of the protrusions. A rotating disk-shaped rotating cutter is provided, and the rotating cutter alternately forms a blade base protruding radially outward and a recess recessed radially inward on the outer periphery of the disk-shaped base metal, The blade base is provided with a flat-blade main tip made of a super-hard material and protective protrusions that regulate the amount of biting of the edge of the main tip edge to a predetermined value or less at intervals in the circumferential direction. In addition, one of the work support base and the tool support base is moved in a direction orthogonal to the protruding direction of the protrusions, and the protrusions are cut by the rotary cutter.
According to a second aspect of the present invention, the amount of biting of the edge of the main tip edge of the main tip by the protective protrusion is restricted to less than 1.0 mm.
According to a third aspect of the present invention, the blade tip side portion of the main tip is chamfered.
According to a fourth aspect of the present invention, a chevron tip that is higher than the main tip is provided on a part of the blade.

  In the invention according to claim 1 of the present invention, for example, when the tool support is moved and the rotary cutter is sent toward the projection of the rough casting, the main tip of the rotary cutter is placed at the position where the projection is set. This part is cut by contact, and the cut chips are discharged from the recess to the outside. For this reason, the cutting of the projections of the main chip is stable without being interrupted by the chips, and the projections can be cut quickly.

  In addition, at the end of cutting the protrusion, the protrusion may be inclined due to its own weight or the like, and a part of the protrusion may collide with the edge of the edge of the main tip. Since this collision is due to the weight of the protrusion, the impact on the main tip increases, but the cutting amount of the edge on the side of the cutting edge of the main tip is regulated to a predetermined value or less by the protective protrusion. , A large load is not generated at the edge, and the edge is hardly damaged.

In the invention according to claim 2, since the amount of biting of the edge is restricted to less than 1.0 mm by the protective protrusion, damage to the edge is reduced particularly with respect to the collision of the aluminum alloy protrusion.
In the invention according to claim 3, since the blade tip side portion of the main tip is chamfered, the rigidity of the edge portion is increased, and this portion is not easily damaged by the collision of the protrusions.
Further, in the invention according to claim 4, since the chevron tip cuts in advance the portion of the main tip of the blade width that is cut, the cutting load of the main tip is reduced, and the projection can be cut quickly. it can.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a schematic plan view of a cutting apparatus showing an embodiment of the present invention, FIG. 2 is a side view of a main part showing a cutting state, FIG. 3 is a partial side view of a rotary cutter, and FIG. FIG. 5 is a front view showing a large and small area of a chip of a chevron chip, FIG. 6 is a front view showing a large and small area of a chip of a main chip, and FIG. It is explanatory drawing shown.

  In FIG. 1, reference numeral 1 denotes a cutting device, which has a work support 2 for fixing a rough casting 20 and a tool support 5 for supporting a rotary cutter. The work support 2 has a support surface 3 and a clamp 4 on the front side, and the rough casting 20 is brought into contact with the support surface 3 and the clamp 4 is operated to press and fix the rough casting 20 to the support surface 3. It has become. In this example, the rough casting 20 is made of an aluminum alloy three-cylinder cylinder head, and has a projection 22 such as a feeder 22a and a gate 22b integrally formed on one side of the cylinder head portion 21, and the projection 22 is a front surface. It is arranged on the side (downward in FIG. 1) and fixed to the work support 2.

  The tool support 5 is movable in the left-right direction in FIG. 1 on the front side of the work support 2, and the rotary shaft 6 is fixed to the left side of the upper surface in the front-rear direction, that is, the work support 2. It is arranged in a direction parallel to the projecting direction of the projection 22 of the rough cast 20 and is rotatably supported by the bearing 7. A motor 8 is attached to the right part of the upper surface, and the motor 8 is a conductor composed of a pulley and a belt. The rotating shaft 6 is rotated via 9.

  A disk-shaped rotary cutter 10 is attached to the back side of the rotary shaft 6. As shown in FIG. 3, the rotary cutter 10 includes a blade base 12 projecting radially outward on an outer peripheral portion of a disk-shaped base 11 made of alloy tool steel (JIS standard; SK5), and a radially inner side. Recessed recesses 13 are alternately formed, and flat blade-shaped main tips 15-1 and chevron tips 15-2 higher than the main tips 15-1 are alternately brazed on the surface of each blade base 12 on the rotation advance side. The protective projections 14 are formed on the outer peripheral portion of each blade base 12 on the reverse rotation side.

  The main chip 15-1 and the chevron chip 15-2 are two layers having a cemented carbide layer and an ultra-hard layer such as a diamond sintered body (PCD) and a cubic boron nitride (CBN) sintered body integrally. The main chip 15-1 has a flat blade shape and is chamfered with a width of about 0.2 mm (FIG. 5) on both sides of the tip cutting edge 15a. The chevron chip 15-2 has a top portion 15d higher than the main chip 15-1, and the left and right hypotenuses 15e have a width of about 1.4 mm (FIG. 6) to form a trapezoidal shape.

  The upper surface and both sides of the protective protrusion 14 are located inward of the distal end portions of the leading edge 15a and the side surface cutting edge 15b of the main chip 15-1, and when the protrusion 22 is inclined at the end of cutting or immediately after cutting. When the projection 22 collides with the edge 15c on the side of the cutting edge of the main tip 15-1 during the dropping of the edge 15c, the amount of biting of the edge 15c is restricted to a predetermined value or less, and the edge 15c is chipped ( Damage).

  In this example, as shown in FIGS. 3 to 4, the diameter D of the rotary cutter 10 is 405 mm, the blade thickness T1 of the main tip 15-1 is about 4 mm, the thickness T2 of the base metal 11 is about 3.2 mm, the tip When the number of 15 is 30, the rotational speed of the rotary cutter 10 is 3600 / min (3600 RPM), and the feed speed V is 1.3 m / min, the distance in the radial direction of the protective projection 14 with respect to the main tip 15-1 (Regulation amount) ML is about 0.8 mm, distance in the radial direction of the protective projection 14 with respect to the chevron chip 15-2 (regulation amount) MH is about 1.0 mm, and the radius of the protection projection 14 with respect to the edge 15c of the main chip 15-1. The direction distance (regulation amount) MLR is about 0.84.

  As shown in FIGS. 1 to 3, the rake angle A of each of the chips 15 (15-1, 15-2) is about zero degrees, the clearance angle C is about 10 degrees, and the side face angle E is about 1 degree. It has become.

表１において、
ＭＨ；山形チップ１５−２に対する保護突起１４の半径方向の距離
ＭＬ；主チップ１５−１に対する保護突起１４の半径方向の距離
ＭＬＲ；主チップ１５−１のエッジ１５ｃに対する保護突起１４の半径方向の距離
Ｄ；回転カッター１０の直径
Ｔ１；チップ１５の刃厚
Ｔ２；台金１１の厚さ
Ｚ；チップ１５の刃数
Ａ；チップ１５のすくい角
Ｃ；チップ１５の逃げ角
Ｎ；回転カッター１０の回転速度
欠け大；刃の欠けが１．０ｍｍ以上
欠け小；刃の欠けが０．３ｍｍ以内
平；平刃形の主チップ
山；山形チップ
前記欠けの大小は、再研磨の可否によって決定する。即ち、刃の欠ける範囲が図５、図６の（ア）に示すように０．３ｍｍ以内であれば、チップ１５がダイヤモンド焼結体（ＰＣＤ）等の超硬質層を有するものであっても、再研磨した方が安価となる。また、刃の欠ける範囲が図５、図６の（イ）に示すように０．３ｍｍを越えるものは、チップ１５がダイヤモンド焼結体（ＰＣＤ）等の超硬質層を有するものであると、再研磨に長時間を要するとともに、砥石の磨耗が増大することになるので、新たなチップと交換した方が得策となる。 Table 1 shows experimental data when an impact is applied to the rotary cutter 10.

In Table 1,
MH; radial distance ML of the protective protrusion 14 relative to the chevron chip 15-2; radial distance MLR of the protective protrusion 14 relative to the main chip 15-1; radial direction of the protective protrusion 14 relative to the edge 15c of the main chip 15-1. Distance D; Diameter T1 of rotary cutter 10; Blade thickness T2 of tip 15; Thickness Z of base 11; Number of blades A of tip 15; Rake angle C of tip 15;
N: Rotational speed chipping of rotary cutter 10; blade chipping of 1.0 mm or more chipping; blade chipping of 0.3 mm or less flat; flat-blade main chip crest; chevron chip chip Determined by whether or not. That is, if the range where the blade is chipped is within 0.3 mm as shown in FIG. 5 and FIG. 6A, the chip 15 has a super hard layer such as a diamond sintered body (PCD). It is cheaper to re-polish. In addition, as shown in FIG. 5 and FIG. 6 (A), when the chip is over 0.3 mm, the tip 15 has a super-hard layer such as a diamond sintered body (PCD). Since re-polishing takes a long time and wear of the grindstone increases, it is better to replace it with a new chip.

  In the experiment of Table 1, as shown in FIG. 7, the rotary cutter 10 having a diameter of 405 mm is rotated at a cutting speed (3600 RPM), and in this state, the aluminum alloy made of an aluminum alloy having a diameter of 40 mm and a length of 150 mm is used. As shown in FIGS. 7 (A) and 7 (B), the simulated projection 22 ′ of FIG. 6 was dropped by its own weight from the vertical direction perpendicular to the rotational axis OL of the rotary cutter 10 as shown in FIGS. As shown in FIG. 7C, each of the case and the case where the dead weight is dropped from the vertical direction inclined by 20 degrees with respect to the rotational axis OL of the rotary cutter 10 are performed three times.

  According to Table 1, in a rotary cutter having a thickness 11 of the base metal 11 of 3.2 mm, when the MLR is less than 1.03 mm (items 1 to 5), the chip 15 has a large chipping of 0.3 mm or more. In addition, in the rotary cutter having the base metal 11 with the thickness T2 of 2.8 mm, it is understood that the chip 15 does not have a large chipping of 0.3 mm or more when the MLR is less than 1.1 mm (item 8).

  According to the above embodiment, the rough casting 20 is fixed to the support surface 3 of the workpiece support 2 via the clamp 4, the motor 8 is activated, and the rotary cutter 10 is rotated counterclockwise in FIG. When the table 5 is moved to the left in FIG. 1, as shown in FIG. 2, the rotary cutter 10 protrudes from the cylinder head portion 21 in the front direction, that is, the base of the feeder 22a and the gate 22b. Are sequentially cut from the right part to the left part.

  In this case, the chips obtained by cutting the portion of the rotary cutter 10 that comes into contact with the protrusion 22 are discharged from the recess 13 and the main chips 15-1 are obstructed by the chips. Without this, the projection 22 is cut with a small cutting load, and the projection 22 is cut smoothly. Further, when the protrusion 22 is inclined by its own weight at the end of cutting the protrusion 22 and a part of the protrusion 22 collides with the edge 15c portion of the main chip 15-1, the cutting of the edge 15c portion is performed. The amount (the amount of biting) is regulated to a value less than a predetermined value (1.0 mm) by the protective protrusion 14, and a large impact is not applied to the edge 15c portion, so that a large damage (chip) does not occur. In addition, since the edge portion of the main tip 15-1 is chamfered and has high rigidity, damage to the edge 15c is further reduced.

  Note that the tip cutting edge 15d of the chevron tip 15-2 receives a collision force from the front even when the projection 22 collides at the end of cutting, and has a large hypotenuse 15e and high cutting edge rigidity. Then, even if MH is 1.4 mm, there is no large blade chip. Considering this, it can be seen that it is more important to make the MLR less than 1.0 mm rather than the values of MH and ML.

It is a schematic plan view of the cutting device which shows the Example of this invention. It is a principal part side view which shows a cutting | disconnection state. It is a partial side view of a rotary cutter. It is an expanded sectional view by the IV-IV line of FIG. It is a front view which shows the size area of the chip | tip of the main chip | tip. It is a front view which shows the magnitude | size area | region of the chip of a Yamagata chip | tip. It is explanatory drawing which shows the experiment aspect of the impact addition of a chip | tip.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting device 2 Work support stand 3 Support surface 4 Clamp 5 Tool support stand 6 Rotating shaft 7 Bearing 8 Motor 9 Conductor 10 Rotating cutter 11 Base 12 Blade base 13 Concave 14 Protection protrusion 15 Tip 15-1 Main tip (flat blade) Chip)
15a Tip cutting edge 15b Side cutting edge 15c Edge of edge 15-2 Angle tip 15d Tip cutting edge 15e Left and right hypotenuses 20 Coarse casting 21 Cylinder head part 22 Projection 22a Hot water 22b Pouring hole A Rake angle C Relief angle E Side face Centripetal angle

Claims (4)

  A rough casting (20) having protrusions (22) such as a feeder and a gate is fixed on the work support (2), and parallel to the protruding direction of the protrusions (22) on the tool support (5). A disk-shaped rotary cutter (10) that rotates about an axis is provided, and the rotary cutter (10) is a blade base (12) that protrudes radially outward on the outer periphery of the disk-shaped base metal (11). ) And recesses (13) recessed radially inward, and a flat-blade main tip (15-1) made of a super-hard material on the blade base (12), and the main tip (15- 1) a protective projection (14) that regulates the amount of biting of the edge (15c) on the side of the blade edge to a predetermined value or less, and is provided at intervals in the circumferential direction, the workpiece support (2) and the tool support One of the base (5) is moved in the direction perpendicular to the protruding direction of the protrusion (22) to rotate Potter (10) by the projections (22) coarse foundry protrusions cutting apparatus characterized by cutting the.   The projection cutting device for a rough casting according to claim 1, wherein the amount of biting of the edge (15c) of the blade tip side portion of the main tip (15-1) by the protective projection (14) is restricted to less than 1.0 mm. .   The projection cutting apparatus for a rough casting according to claim 1 or 2, wherein the edge portion of the main tip (15-1) is chamfered.   The projection cutting device for a rough casting according to claim 1, 2 or 3, characterized in that a part of the blade (12) is provided with a chevron tip (15-2) higher than the main tip (15-1). .

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