JP2004202562A - Repair tool, repair method and repair device for casting cavity - Google Patents

Abstract

An object of the present invention is to provide a repair method and the like that can reliably and inexpensively repair a cavity formed on a flat surface of a casting.
A repair tool (10) having a side surface (12), an end surface (11), and a lower surface (22) in the form of a thin rectangular plate and having a rake surface (13) and a transverse cutting surface (17) formed on a side surface is moved on a plane (82) of a casting (80). At that time, the repair tool 10 is repeatedly moved in the first direction, and while the material around the cavities 84 is plastically flown in the first direction by the rake face 13, the repair tool 10 is moved in the second direction orthogonal to the first direction. The material around 84 is plastically flown in the second direction at the cross section 17.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to repair of a cavity in a casting, and more particularly to a repair tool, a repair method, and a repair apparatus for a cavity formed on a plane of a casting.
[0002]
[Prior art]
One of the cast products (castings) is a cylinder block of a vehicle engine. The cylinder block includes a cylinder main body in which a plurality of cylinder bores are formed, and a cylinder head covered on a flat upper surface (sealing surface). In consideration of lightness and low cost, the cylinder block body is often manufactured by die-casting an aluminum alloy. However, due to the characteristics of die casting, a cavity is easily formed on the sealing surface of the cylinder block body.
[0003]
In the conventional example (see Patent Document 1), a flat surface formed at the tip of diamond abrasive grains constituting a grindstone is moved in parallel with the seal surface to grind the seal surface in order to repair the cavities. More specifically, as shown in FIGS. 7 and 8, a plurality of bolt heads 102 are circumferentially separated from each other on an outer peripheral edge of a disc-shaped grindstone 100. A flat surface 106 is formed after bonding the diamond abrasive grains 104 to the tip end surface of the bolt head 102 by bonding.
[0004]
As shown in FIG. 9, at the time of repairing the porosity 113 of the sealing surface 112, the grindstone 100 is moved while rotating with respect to the positioned cylinder block 110, and is ground by a predetermined cutting amount. Then, the flat surface 106 of the diamond abrasive 104 rubs and grinds the sealing surface 112, and the cavity 113 within a predetermined depth from the sealing surface 112 is crushed.
[0005]
[Patent Document 1]
JP-A-10-202492
[0006]
[Problems to be solved by the invention]
However, in the conventional example, the cost for repairing the cavity 113 of the sealing surface 112 was high for the following reasons. First, although the diamond abrasive grains 104 have a high hardness, the pressure per unit area is high because the contact area with the seal surface 112 is small, and the diamond abrasive grains 104 are easily worn. The worn diamond abrasive grains 104 need to be replaced, but they are rare and expensive. In addition, frequent replacement of the diamond abrasive grains 104 takes time and effort.
[0007]
Further, as described above, since the contact area between the diamond abrasive grains 104 and the sealing surface 112 is small, chips generated during the repair are hardly removed by the diamond abrasive grains 104. Therefore, it is necessary to supply cutting oil to the repair part under pressure to forcibly remove generated chips. This not only requires a cutting oil supply device, but also takes time and effort to remove chips.
[0008]
The present invention has been made in view of the above circumstances, a repair tool that can reliably and inexpensively repair a cavity formed in the plane of the casting, a repair method for repairing the cavity using the repair tool, It is another object of the present invention to provide a repair device for repairing a porosity using the repair tool.
[0009]
[Means for Solving the Problems]
The inventor of the present application has studied the shape of a repair tool that is effective in reducing the cost for repairing a cavities. As a result, the present invention was completed, with the idea that the repair tool was made of a high-hardness cemented carbide, diamond, or the like, and that the repair tool had a shape having a large contact area with the plane of the casting.
[0010]
A tool for repairing a casting cavity in a casting according to the first invention of the present application has a side surface, an end surface, and a lower surface in the shape of a thin rectangular plate as described in claim 1; It has an elongated rectangular shape and forms 45 to 80 degrees with respect to a plane perpendicular to the side surface in the end view; the cross section formed near the end surface on the side surface has a triangular shape, and 5 to 10 degrees; In this repair tool, the rake face that forms 45 to 80 degrees with respect to a plane perpendicular to the side surface when viewed from the end, and the cross-section that forms 5 to 10 degrees with respect to the side surface when viewed in plan view include a material around the cavity. This is convenient for plastic flow.
[0011]
The repair tool according to claim 2 is further characterized in that, in claim 1, an inclined surface is formed near the upper surface on the side surface, and a flat surface is formed in a portion between the rake surface and the inclined surface except for a cross-section surface.
[0012]
As described in claim 3, the method for repairing a casting cavity in a casting according to the second invention of the present application has a side surface, an end surface, and a lower surface in a thin rectangular plate shape, and from 45 to a plane perpendicular to the side surface in end view. A method of repairing a casting cavity on a plane of a casting by moving a repair tool having a rake face forming 80 degrees and a cross-sectional surface forming 5 to 10 degrees with respect to a side surface in plan view formed on a side surface, The repair tool is repeatedly moved in the first direction and the material around the cavity is plastically flowed in the first direction by the rake face, and is moved in the second direction orthogonal to the first direction to cross the material around the cavity. The surface is plastically flown in the second direction. In this repairing method, the material around the cavity is plastically flowed in the first direction by the rake face of the repair tool to be moved, and is plastically flowed in the second direction by the cross section.
[0013]
The repair method according to claim 4 is the method according to claim 3, wherein the rough machining tool is moved in the first direction and the second direction to rough-machine a plane before the repair of the cavity by the repair tool. Later, the finishing tool is moved in the first direction and the second direction to finish the flat surface.
[0014]
The casting cavity repair apparatus according to the third invention of the present application is a repair apparatus for repairing a casting cavity formed on a flat surface of a casting with a repair tool attached to a milling cutter, as described in claim 5, A cylindrical milling cutter rotating about an axis and moving in a direction perpendicular to the axis; a rake face having a side face, an end face, and a lower face in a thin rectangular plate shape and forming 45 to 80 degrees with respect to a plane perpendicular to the side face in end view And at least one cross cut surface formed on the side surface at 5 to 10 degrees with respect to the side surface in plan view, the rake face being forward in the rotation direction, and the cross cut face being forward in the movement direction. And a repair tool. In this repairing apparatus, when the milling cutter is moved while being rotated, the rotating rake face and the moving cross section cause the material around the cavity to flow plastically.
[0015]
According to a sixth aspect of the present invention, in the fifth aspect, the plurality of repair tools are spaced apart in a circumferential direction of the milling cutter, the amount of protrusion of a side surface of the repair tool from a tip end surface of the milling cutter, and repair from an outer peripheral surface. The protruding amounts of the end faces of the tool are different from each other.
[0016]
The casting cavity repair apparatus according to the fourth aspect of the present invention repairs a casting cavity formed in a plane of a casting with three types of repair tools attached to a cylindrical milling cutter as described in claim 7. A repair device, which is a milling cutter that rotates around an axis and moves in a direction perpendicular to the axis; a thin rectangular plate having an end surface, a lower surface, a rake surface and a side surface with a cut surface, and the rake surface is viewed from the end surface. 45 to 80 degrees with respect to a plane perpendicular to the side surface, the cross section forms 5 to 10 degrees with respect to the side surface in plan view, the side surface protrudes from the tip surface of the milling cutter by a first axial amount, and the end surface. Is mounted on the fixed shaft so as to protrude from the outer circumferential surface of the milling cutter by a first radial amount, and at least one repair tool whose rake face faces forward in the rotational direction and whose transverse face faces forward in the moving direction; A few with rough surface Least one roughing tool and; at least one finishing tool having finishing surface for finishing the plane; consisting.
[0017]
The roughing tool is attached to the fixed shaft so as to protrude from the tip end surface of the milling cutter in a second axial direction smaller than the first axial direction and protrude from the outer peripheral surface in a second radial direction larger than the first radial direction. Has been. The finishing tool is attached to the fixed shaft so as to protrude from the tip end surface of the milling cutter in a third axial direction amount larger than the first axial direction amount and to project from the outer peripheral surface in a third radial direction amount smaller than the first radial amount. Has been. In this repair device, when the milling cutter is rotated and moved, the rough machining tool rough-processes a flat surface before the repair of the cavity by the repair tool, and the finishing tool finishes the flat surface after the repair of the cavity by the repair tool. .
[0018]
The repair method according to claim 9 is the method according to claim 8, wherein the repair tool and the finishing tool are mounted at positions facing each other in the diametric direction of the milling cutter, and a plurality of the repair tools and the finishing tool are circumferentially disposed between the repair tool and the finishing tool. The rough machining tool is spaced apart.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
<Castings>
Although the material of the casting is not limited, a casting cavity is easily formed in an aluminum casting, and the present invention is effectively applied. The shape of the casting is not limited, and it is sufficient that at least a part has a flat surface.
[0020]
The cavities may be small depressions opened in the plane of the casting or small cavities that do not open. The diameter of the casting cavity targeted by the present invention is 3.0 mm or less, and the depth is 3.0 mm or less. If the diameter of the cavity is less than about 2.0 mm and the depth is less than about 2.0 mm, it can be repaired in one case in most cases. When the diameter is about 2.0 mm or more, the repair may be repeated twice or more.
<Repair tools>
The repair tool is made of super steel, diamond, or the like, is manufactured by stamping, polishing, or the like, and preferably has a thin rectangular plate shape having at least a side surface, an end surface orthogonal to the side surface, and a lower surface orthogonal to both sides. A rake face and a front cutting face are formed on the side face. The rake face is formed, for example, near the lower surface of the side face, and can have an elongated rectangular shape. The transverse cut surface is formed, for example, near the side surface and can have a triangular shape.
[0021]
The “rake face” functions as a restraining face that allows the material to flow plastically in the rotation direction of the repair tool, and forms an angle of 45 to 80 degrees (rake angle) with respect to a plane perpendicular to the side surface in end view. In other words, 45 to 10 degrees to the side. When the rake angle is 80 degrees or more, the machining resistance increases, and a large driving force is required for driving the milling cutter. When the rake angle is 45 degrees or more, a flat material is cut.
[0022]
On the other hand, the "cross-cut surface" has a function of causing the material to flow plastically in the feed direction of the repair tool, has a triangular shape formed near the end surface of the side surface, and has an angle of 5 to 10 degrees with respect to the side surface in a plan (upper surface) view. Make. When the transverse angle is less than 5 degrees, the repair allowance cannot be increased, and when the transverse angle is more than 10 degrees, the flat material of the casting is cut.
[0023]
The repair tool can further have an inclined surface near the upper surface of the side surface, and a flat blade-killing surface between the rake surface and the inclined surface. The blade-killing surface is formed of a flat surface, and is formed at a middle portion in the thickness direction on one side surface except for the front cutting surface, and has a small height.
<Repair method>
The repair method includes a first type in which only repair with a repair tool is performed, and a first type in which rough machining with a rough machining tool and finish machining with a finish machining tool are additionally performed.
(1) First type
The repair tool is moved in a first direction and a second direction orthogonal to each other on the plane of the casting. For this purpose, for example, a repair tool can be attached to a reciprocating member that repeatedly moves in the left-right direction and finely moves in the front-rear direction.
[0024]
However, considering work efficiency, it is desirable to attach a repair tool to the outer peripheral edge of a cylindrical milling cutter that is rotatable about an axis and movable in a direction perpendicular to the axis. Further, a plurality of repair tools may be used, or the repair tool of the present invention and a normal tool cutting may be used to finish a flat surface.
(2) Second type
Before the repair with the repair tool, the plane is rough-machined with the rough machining tool, and after the repair with the repair tool, the plane is finished with the finishing tool. In the first and second types, the moving speed in the first direction, that is, the turning radius and the number of rotations of the milling cutter, the moving speed in the second direction, that is, the feeding speed in the direction perpendicular to the axis of the milling cutter, the repair allowance per operation, and the like. Will be described later.
<Repair equipment>
{Circle around (1)} A repair device is a first type including one or more repair tools and a milling cutter to which the repair tool is attached, and one or more repair tools, a roughing tool, a finishing tool, and a milling cutter to which these are attached. And a second type comprising a cutter. In either the first type or the second type, the milling cutter is rotatable about an axis and movable in a direction perpendicular to the axis.
(2) First type
Only one repair tool may be attached to the milling cutter. In this case, the amount of protrusion of the side surface from the tip surface of the milling cutter and the amount of protrusion of the end surface from the outer peripheral surface of the milling cutter are determined in consideration of securing an area capable of fixing the repair tool while securing a sufficient allowance. . When the size (depth, hole diameter) of the cavities is large, or when many cavities exist on a plane, the repair may be performed a plurality of times while adjusting the protrusion amount of the repair tool. Here, "one repair" refers to moving the rotating milling cutter from one end to the other end on the plane of the casting.
[0025]
In the case where the size of the cavities is large, a plurality of repair tools can be provided on the milling cutter in the circumferential direction. In this case, the amount of protrusion of the side surface and the end surface of each repair tool may be the same, but it is desirable that the amount is slightly different. One repair with a plurality of repair tools can achieve the same repair effect as multiple repairs with one repair tool, thereby improving repair efficiency.
(3) Second type
The "roughing tool" is a tool for stabilizing a repair allowance, and one may be attached, but it is desirable to attach a plurality of tools. The "finishing tool" is a tool that removes burrs generated during repair and repairs the surface roughness of the repair surface. A plurality of finish tools may be attached, but usually one is sufficient.
[0026]
Regarding the relative positional relationship of the three types of tools, the roughening tool, the repair tool, and the finishing tool may be arranged in the rotation direction of the milling cutter in the order of the cavity. For this purpose, for example, they can be spaced apart in the circumferential direction of the milling cutter. Regarding the axial protrusion amount, the protrusion amount of the finishing tool is the largest, the protrusion amount of the roughing tool is the smallest, and the protrusion amount of the repair tool is in the middle. Regarding the radial projection, the projection of the roughing tool is the largest, the projection of the finishing tool is the smallest, and the projection of the repair tool is intermediate.
<Repair conditions>
The repair method and the repair conditions in the repair device include the radius and rotation speed of the milling cutter, the moving (feeding) speed, and the amount of various tools protruding from the front end surface and the outer peripheral surface of the milling cutter.
(1) Milling cutter
The diameter of the milling cutter can be from 100 to 300 mm. The number of revolutions of the milling cutter can be set to 500 to 6000 rpm in consideration of the material of the casting, the hole diameter and depth of the casting cavity, and the like. As a result, the repair speed is between 500 and 2000 m / min. The moving (feeding) speed of the milling cutter in the direction perpendicular to the axis can be 0.05 to 0.2 mm / rotation in consideration of the material of the casting, the area of the plane, the hole diameter and depth of the casting cavity, and the like.
[0027]
For example, when repairing a rectangular plane by moving the milling cutter in the longitudinal direction, the diameter of the milling cutter is made larger than the short side of the plane. By the rotation of the milling cutter, the repair tool is repeatedly moved on a plane along a circular locus. Depending on the processing conditions, one cavity is repaired several times to several tens of times by one repair tool. When the milling cutter moves on the plane from one end to the other end in the longitudinal direction, one repair is completed.
(2) Repair tools
The repair allowance per operation can be 0.1 to 0.2 mm. If the repair allowance is larger than this, a large motor is required to drive the milling cutter, and if it is smaller than this, the number of repairs increases. The repair is performed once or twice or more in consideration of the size of the cavities. When the depth of the cavity is shallow or the hole diameter is small (the diameter is 1 mm or less), the cavity can be repaired in substantially one repair step. When the depth of the casting cavity is large or the hole diameter is large, the repairing step may be repeated twice or more. In that case, the repair cost of each time may be the same or different.
[0028]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
<First embodiment>
▲ 1 ▼ body
The plate-shaped sample 80 shown in FIG. 1 is made of the same material as the cylinder block main body (aluminum die-cast: ADC12), and has a seal surface 82 having the same shape and flatness as the seal surface. As shown in FIG. 4A, a plurality of cavities 84 having a diameter of 1.0 mm and a depth of 10 mm were artificially formed on the sealing surface 82.
(2) Repair tools
The throwaway tip (repair tool, hereinafter abbreviated as "tip") 10 has a main body (other than the cutting edge) 10a made of a cemented carbide and a cutting edge 10b made of a sintered diamond. As shown in FIGS. 3 (a), 3 (b) and 3 (c), it has a flat rectangular plate shape as a whole, and has one end face (front face) 11, side faces 12, upper face 21 and lower face 22 which are respectively perpendicular to the one face. Have. The dimension from the vertical direction to the length direction (vertical direction in FIG. 3B) is 12.7 mm, the dimension from the horizontal direction to the width direction (left and right direction in FIG. 3B) is 12.7 mm, and the height direction (FIG. 3 (c) in the left-right direction) is 4.76 mm. On the side surface 12, a flat and deformed trapezoidal rake face 13 is formed over the entire length in the lower half in the height direction. As can be seen from FIG. 3A (viewed from the end), the rake face 13 forms 60 degrees with respect to a plane perpendicular to the side surface 12 (hereinafter, this angle is referred to as “rake angle α”). The height of the rake face 13 is highest at a portion near the one end face 11, and gradually decreases toward the one end face 11 and the other end face 26.
[0029]
A flat, deformed inverted trapezoidal inclined surface 14 is formed on the upper half in the height direction of the side surface 12 over the entire length. The height of the inclined surface 14 gradually increases from the one end surface 11 to the other end surface 26. The inclined surface 14 forms about 45 degrees with respect to the side surface 12 and the upper surface 21.
[0030]
Between the rake face 13 and the inclined face 14, that is, at an intermediate portion in the height direction of the side face 12, a flat and elongated blade-killing face 16 is formed at a portion other than a front cutting face 17 described below. As can be seen from FIG. 3 (c), the upper surface 21 and the lower surface 22 make an angle of about 10 degrees, approach the lower surface 22 toward the other end surface 26, and have an end surface on the side surface 12 having a height of about 0.2 mm. A flat, triangular cross section 17 is formed at the end on the 11th side. As can be seen from FIG. 3C (in plan view), the transverse cutting surface 17 forms an angle of about 7 degrees with the side surface 12, that is, the blade cutting surface 16 (hereinafter, this angle is referred to as “front cutting angle β”). Narrow (0.05 to 0.1 mm) flat surfaces 18a and 18b are formed between the transverse cutting surface 17 and the rake surface 13 and the inclined surface 14.
[0031]
The chip 10 was formed by stamping a cemented carbide into a flat rectangular shape, and then forming a rake face 13, a transversely cut face 17 and the like by polishing.
(3) Installation of milling cutters and repair tools
As shown in FIG. 1, the milling cutter 30 has a cylindrical shape and has a large-diameter portion 32 formed at the lower end thereof. The diameter of the large diameter portion 32 is about 200 mm, and the rotation speed of the milling cutter is 2000 rpm. The chip 10 is inserted and fixed in a slit 34 formed in the radial direction and the axial direction with a predetermined width at a position on the outer peripheral edge of the large diameter portion 32 at a position dividing the circumference into four equal parts.
[0032]
As shown in FIGS. 1 and 2, the tip 10 has a side surface 12, i.e., a blade-killing surface 16, projecting about 1.0 mm in the axial direction from a tip end surface 31 of the milling cutter 30, and the end surface 11 extends radially from an outer peripheral surface 33. It protrudes about 1.0 mm. The repair allowance is 0.1 to 0.2 mm.
[0033]
The blade killing surface 16 is in contact with the sample 80 sealing surface 82. In FIG. 1, the rake face 13 forms about 60 degrees with respect to a plane (vertical plane in FIG. 1) orthogonal to the sealing face 82, and the transverse cutting face 17 forms about 7 degrees with respect to the sealing face 82. .
▲ 4 ▼ Repair method
Next, the repair of the porosity 84 of the sealing surface 82 of the sample 80 by the tip 10 will be described. In FIG. 2, while rotating the milling cutter 30 in the counterclockwise direction x, the sealing surface 82 is advanced in the lateral direction y from one end to the other end of the sealing surface 82, and the sealing surface 82 is processed by the tip 10. At this time, since the rotational speed of the milling cutter 30 is set to 2000 rpm, the chip 10 rotates in a circumferential direction along a circular locus at a processing speed of 1250 m / min. The feed speed in the direction perpendicular to the axis was 0.1 mm / revolution. Due to the magnitude relationship between the feed speed of the chip 10 (0.1 mm / revolution) and the hole diameter of the cavity (0.5 to 1.0 mm), the chip 10 repairs the cavity 84 several times repeatedly.
[0034]
At the time of repair, the material around the cavity 84 of the sealing surface 82 is plastically flown in one direction (perpendicular to the paper surface in FIG. 1) by the rake face 13 of the chip 10 and in the other direction (see FIG. (1 in the left-right direction).
[0035]
As shown in FIG. 4B, the cavities 84 having a diameter of 1.0 mm and a depth of 10 mm opened in the sample 80 were almost repaired by one repair. The circles indicate the range in which the porosity 84 originally existed. Further, when the cavities 84 after the repair and the fibers around the cavities 84 were observed with an electron microscope, the flow of the material was confirmed in one direction and the other direction.
▲ 5 ▼ Effect
According to this embodiment, first, the tip 10 is hardly worn during repair. This is because the areas of the rake face 13 and the transverse cutting face 17 are much larger than the area of the diamond abrasive grains, and the pressure per unit area is much lower. Since it is difficult to wear, one tip 10 can repair more cavities 84 than the diamond abrasive grains 104 of the conventional example, and the number of times of exchanging the tip 10 can be reduced. As a result, the time and labor required for replacement can be reduced. In addition, the main body 10a of the chip 10 can be mass-produced by machining or the like, and the manufacturing cost is low. The cutting edge 10b is made of a sintered diamond, so that the hardness is inferior to that of the diamond abrasive 104. Absent.
<Second embodiment>
(Constitution)
In the second embodiment, roughing is performed before repairing the cavities 84 by the above-described insert 10, and finishing is performed after the repairing. Here, “roughing” is performed to stabilize the repair allowance, and a roughing tool 60 having a front end surface 61 and an outer peripheral surface 62 as a roughing surface is used as shown in FIG. . On the other hand, “finishing” is performed to remove burrs generated at the time of repair and to repair the surface roughness of the sealing surface 82. As shown in FIG. A finishing tool 50 having a front end surface 51 and an outer peripheral surface 52 is used. The three types of tools 10, 50 and 60 are mounted on the milling cutter 30 to perform roughing, repair and finishing simultaneously.
[0036]
Specifically, as shown in FIG. 5 (a), the insert 10 and the finishing tool 50 are attached to a milling cutter 30 having a diameter of about 125 mm at positions facing each other in the diametrical direction. The roughing tools 60 are attached at regular intervals. As a result, as a whole, the eight tools 10, 50 and 60 are arranged at equal intervals in the circumferential direction.
[0037]
As shown in FIG. 5B, regarding the amount of protrusion in the axial direction, the front end face 61 of the roughing tool 60 protrudes 1.0 mm from the front end face 31 of the milling cutter 30, and the side surface 12 of the tip 10 is placed at 0. The end surface 51 of the finishing tool 50 protrudes by 0.1 mm from the side surface 12 by 1 mm. The reason why the axial protrusion amount is set in such a relationship is to secure a repair allowance of 0.1 mm with the tip 10 stably and further secure a finish allowance necessary for finishing the sealing surface.
[0038]
On the other hand, with respect to the amount of protrusion in the radial direction, the outer peripheral surface 52 of the finishing tool 50 projects 1.0 mm from the outer peripheral surface 33 of the milling cutter 30, the end face 11 of the tip 10 projects 0.1 mm from the outer peripheral surface 33, The outer peripheral surface 62 protrudes from the end surface 11 by 0.1 mm. The reason why the radial protrusion amount is set to have such a relationship is that the cavity on the plane is roughed first, then repaired, and finally finished.
(Effect)
In FIG. 5A, the milling cutter 30 moves rightward while rotating counterclockwise. The axial projecting amount of the roughing tool 60 is smaller than that of the repair tool 10. However, the milling cutter 30 rotates and moves in the direction perpendicular to the axis at the same time as rotating, and the amount of protrusion of the outer peripheral surface 62 of the rough machining tool 60 in the radial direction is larger than that of the end surface 11 of the repair tool 10. Therefore, in the unrepaired area of the seal surface 82, the front end face 61 of the rough machining tool 60 is cut before the side surface 12 of the repair tool 10.
[0039]
Thus, the roughing tool 60 first roughens the cavity 84 (see FIG. 1) on the sealing surface 82, and then the tip 10 repairs the cavity. At that time, since the periphery of the casting cavity 84 has already been rough-machined by the rough machining tool 60, the repair amount of the chip 10 is reduced, and the life of the chip 10 is extended. Since the plurality of roughing tools 60 are attached, the individual roughing tools 60 are less likely to be worn.
[0040]
Since the unit price of each roughing tool 60 is low, the cost does not matter even if a plurality of the roughing tools 60 are attached, and the merit that the casting cavity having a larger dimension can be surely repaired with a small number of repairs is greater. Further, even if burrs are generated during the repair by the chip 10, the burrs are removed by the finishing tool 50.
[0041]
【The invention's effect】
As described above, the casting cavity repair tool according to the first aspect of the present invention can be manufactured at low cost, has a long service life, and the rake face and the cross cut surface reliably repair the casting cavity on the plane of the casting. According to the repair tool of claim 2, the repair effect is further improved.
[0042]
According to the repair method of the second invention, the material around the cavity in the plane of the casting is plastically flowed by the repair tool moved in the first direction and the second direction, and the cavity is reliably repaired. According to the repair method of claim 4 and claim 5, the cavity is more reliably repaired.
[0043]
According to the repairing device of the third invention, the repairing tool having the rake face and the transverse cutting face is moved in the first direction and the second direction by the rotating and moving milling cutter, so that the cavity in the plane of the casting is reliably formed. To repair. According to the repairing device of the seventh aspect, the plurality of repairing tools repair the casting cavity more reliably.
[0044]
According to the repairing apparatus of the fourth invention, in addition to the repairing tool having the rake face and the transverse cutting face, the roughing tool and the finishing tool are moved in the first direction and the second direction by the rotating and moving milling cutter, More reliably repairs cavities on the plane of the casting.
[0045]
According to the repair device of the ninth aspect, the three types of tools repair even a large cavity in a shorter time.
[Brief description of the drawings]
FIG. 1 is an explanatory front view showing a first embodiment of the present invention.
FIG. 2 is an explanatory bottom view of the same.
3A and 3B show a repair tool used in the first embodiment, wherein FIG. 3A is an upper (flat) view, FIG. 3B is a front (end) view, and FIG. 3C is a side view.
FIG. 4 (a) is a photograph of a plane before repairing a cavity, and FIG. 4 (b) is a photograph of a plane after repair.
5A and 5B show a second embodiment of the present invention, wherein FIG. 5A is an explanatory bottom view and FIG. 5B is an enlarged view of a main part.
FIG. 6A is an explanatory view showing a rough working tool according to a second embodiment, and FIG.
FIG. 7 is a cross-sectional view (half omitted) showing a conventional grindstone.
FIG. 8 is an enlarged view of a main part of FIG. 7;
FIG. 9 is an operation explanatory view of a conventional example.
[Explanation of symbols]
10: Repair tool (chip) 11: End face
12: Side 13: Rake
17: Cross section 21: Top
23: Lower surface 30: Milling cutter
31: Tip surface 33: Outer surface
50: Finishing tool 60: Roughing tool

Claims (8)

It has a side surface, an end surface and a lower surface in a thin rectangular plate shape,
The rake face formed near the lower surface on the side surface has an elongated rectangular shape, and forms 45 to 80 degrees with respect to a plane perpendicular to the side surface in end view,
A tool for repairing a casting cavity in a casting, wherein the cross section formed near the end face on the side surface has a triangular shape and forms 5 to 10 degrees with respect to the side surface in plan view. The repair tool according to claim 1, wherein an inclined surface is formed near an upper surface on the side surface, and a flat surface is formed between the rake surface and the inclined surface at a portion other than the transverse cut surface. A rake face having a side surface, an end surface, and a lower surface in a thin rectangular plate shape, forming an angle of 45 to 80 degrees with respect to a plane perpendicular to the side surface in an end view, and a cross-sectional surface forming 5 to 10 degrees with respect to the side surface in a plan view. Is a method of moving a repair tool formed on the side surface to repair a cavity in a plane of a casting,
The repair tool is repeatedly moved in a first direction, and the material around the cavity is plastically flowed in the first direction by the rake face, and is moved in a second direction orthogonal to the first direction to move the material around the cavity. Is caused to flow plastically in the second direction at the transverse cut surface. Prior to the repair of the cavity by the repair tool, the roughing tool is moved in the first direction and the second direction to rough-machine the plane, and after the repair of the cavity by the repair tool, the finishing tool is moved to the first direction. 4. The repair method according to claim 3, wherein the flat surface is finished by being moved in the second direction. A repair device for repairing a cavity formed in a plane of a casting with a repair tool attached to a milling cutter,
A cylindrical milling cutter that rotates around the axis and moves in the direction perpendicular to the axis,
A rake face having a side surface, an end surface, and a lower surface in a thin rectangular plate shape, forming an angle of 45 to 80 degrees with respect to a plane perpendicular to the side surface in an end view, and a cross-sectional surface forming 5 to 10 degrees with respect to the side surface in a plan view. At least one repair tool formed on the side surface and attached to the milling cutter such that the rake face is forward in the rotation direction and the transverse face is forward in the movement direction.
An apparatus for repairing casting cavities, comprising: The repair device according to claim 5, wherein the plurality of repair tools are spaced apart in a circumferential direction of the milling cutter, and the amount of protrusion of the side surface from the tip surface of the milling cutter and the end surface from the outer peripheral surface is different. A repair device for repairing a cavity formed on the plane of a casting with three types of repair tools attached to a cylindrical milling cutter,
A milling cutter that rotates around the axis and moves in a direction perpendicular to the axis, a thin rectangular plate-shaped end face, a lower face, a rake face and a side face with a cross-section formed, and the rake face is a plane perpendicular to the side face as viewed from the end face. 45 to 80 degrees with respect to the side surface, the cross-sectional surface forms 5 to 10 degrees with respect to the side surface in plan view, the side surface protrudes from the tip end surface of the milling cutter in the first axial direction, and the end surface is At least one repair tool attached to the fixed shaft so as to protrude from the outer peripheral surface of the milling cutter by a first radial amount, the rake face being forward in the rotational direction, and the transverse face being forward in the moving direction;
A second radial direction having a roughened surface for roughing the flat surface, projecting from the tip end surface of the milling cutter in a second axial direction smaller than the first axial direction amount, and being larger than the first radial direction amount from the outer peripheral surface; At least one roughing tool attached to the fixed shaft so as to protrude by an amount;
A finishing surface for finishing the flat surface, projecting from the tip end surface of the milling cutter in a third axial direction amount larger than the first axial direction amount, and projecting from the outer peripheral surface in a third radial direction less than the first radial amount; At least one finishing tool attached to the fixed shaft so as to protrude therefrom;
A repair device comprising: The repair tool and the finishing tool are mounted at positions diametrically opposed to the milling cutter, and a plurality of the roughing tools are spaced between the repair tool and the finishing tool in a circumferential direction. The repair device according to claim 7, wherein

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