JP2022079878A - Portable processing machine - Google Patents

Abstract

To provide a portable processing machine including a base, which is light-weight and highly rigid and has a high-quality appearance, under the circumstance where there is a demand that the weight of the base is reduced to reduce the weight of the portable processing machine and various improvement may be made in the base of the portable processing machine to meet the demand.SOLUTION: A portable processing machine 1 includes: a tool body part 10 which houses a motor 21 and supports a blade tool 11 which is rotated by the motor 21; and a base 2 including a lower surface 2c which supports the tool body part 10 and is placed in contact with a workpiece with the blade tool 11 protruding downward. The base 2 is made of magnesium, and a layer of nickel plating is formed on its surface.SELECTED DRAWING: Figure 1

Description

The present invention relates to a portable processing machine for processing a work material.

For example, a portable processing machine called a portable circular saw has a tool main body provided with a tip tool driven by an electric motor as a drive source, and a base for supporting the tool main body. Cutting can be performed by bringing the work material into contact with the lower surface of the base and projecting a tip tool toward the lower surface side of the base to cut into the work material.

Aluminum bases have been widely used in conventional portable processing machines. Patent Document 1 describes a nickel-plated aluminum base. The hardness of the base can be increased by applying nickel plating. Furthermore, the appearance of the base can be enhanced.

It has been conventionally desired to reduce the weight of the base in order to reduce the weight of the portable processing machine. In order to maintain the strength of the base from the conventional product and reduce the weight, it is conceivable to make the base made of magnesium. However, it has been difficult to apply nickel plating to a magnesium base. For example, if the surface treatment before the nickel plating or the plating treatment is non-uniform, the nickel plating tends to wear easily. In addition, corrosion is likely to occur between the magnesium base and the nickel plating. It has been difficult to uniformly apply nickel plating and surface treatment to a base having a plurality of protrusions or recesses.

Japanese Unexamined Patent Publication No. 2001-315075

As mentioned above, there was room for various improvements in the base of the portable processing machine. Therefore, a portable processing machine having a lightweight, high hardness, and high-class base has been conventionally required.

According to one feature of the present disclosure, the portable processing machine accommodates an electric motor and supports a tool main body portion that supports a cutting tool rotated by the electric motor, and a tool main body portion in a state where the cutting tool is projected downward. It has a base with a lower surface that comes into contact with the work piece. The base is made of magnesium and has a nickel-plated layer on the surface.

Therefore, the base of the portable processing machine can be made lighter by providing it with magnesium. Moreover, by applying nickel plating, a base having high hardness can be provided. Further, by applying nickel plating, the appearance of the base can be enhanced.

According to other features of the present disclosure, the nickel-plated layer is 1/200 to 1/100 of the base wall thickness. Therefore, the nickel-plated layer is provided thicker than a general plating layer which is approximately 1/200 or less of the wall thickness of the base. Wear can be suppressed by providing a thick nickel-plated layer. Further, the strength of the base can be improved by increasing the relative thickness of the nickel-plated layer with respect to the wall thickness of the base to increase the hardness. Furthermore, corrosion between the nickel plating and the base can be prevented. Thus, the base can be maintained with high hardness and a sense of quality.

According to other features of the present disclosure, the base has a corner between the lower surface and the anterior-posterior surface or left and right side surfaces that stand adjacent to the lower surface. At least a part of the corner portion has an arc shape in cross section. Therefore, a region having an arc-shaped cross section is provided at the corner portion having a convex shape. Therefore, nickel plating can be applied substantially uniformly along the arcuate cross-sectional shape at the corners. As a result, wear of the nickel plating at the corners can be suppressed. Since the corners are located at the edge of the lower surface that comes into contact with the work piece, wear is likely to occur. Therefore, the wear of the nickel plating on the magnesium base can be suitably suppressed. Furthermore, corrosion between the nickel plating and the magnesium base at the corners can be suppressed.

According to another feature of the present disclosure, at least one outer peripheral corner portion of the four outer peripheral corner portions connecting the front-rear surface and the left-right side surface has a cross-sectional arc shape in a plan view. At least a corner portion having an arc shape in cross section is located at the lower end portion of at least one outer peripheral corner portion. Therefore, at least one outer peripheral corner portion has a cross-sectional arc shape in the horizontal direction and the vertical direction. Therefore, at least one outer peripheral corner portion is three-dimensionally rounded. Therefore, nickel plating can be applied to the outer peripheral corners substantially uniformly along the arc shape in the vertical direction and the horizontal direction. This can suppress the wear of the nickel plating at the outer peripheral corners and the corrosion between the nickel plating and the magnesium base.

According to another feature of the present disclosure, the corner portion has an arc-shaped portion which is a curved surface having an arc-shaped cross section, and an inclined surface portion having a linear cross section which is adjacent to the arc-shaped portion and is inclined with respect to the lower surface below the arc-shaped portion. Have. Therefore, the nickel plating layer is applied with a substantially uniform thickness in the arc-shaped portion. Further, when the lower portion of the base material (base molded body) is removed to form the lower surface of the base, the thickness of the removed portion to be removed may vary. Also in this case, the angle formed by the inclined surface portion and the lower surface portion can be provided in the same angle shape. Moreover, this angle can be provided at a blunt angle. Therefore, the thickness of the nickel plating layer is unlikely to be thinned at the corners formed by the inclined surface portion and the lower surface portion. Thus, variations in the thickness of the nickel-plated layer at the corners can be suppressed.

According to another feature of the present disclosure, the corner portion has a curved surface having an arcuate cross section connecting the front-rear surface or the left-right side surface and the virtual plane parallel to the lower surface below the lower surface. Therefore, with respect to the base material (base molded body) before the lower surface is flattened, the corner portion of the lower end portion can be formed into a so-called rounded chamfered shape. Therefore, the corners of the base molded product can be made into a simple shape. As a result, a mold for molding the base molded body can be easily manufactured.

According to other features of the present disclosure, a recess is provided on the upper surface of the base. The recess is surrounded by a vertical wall that stands up in the vertical direction. The vertical wall has a rounded portion that is curved when viewed from above. The tangent line in contact with the rounded portion extends parallel and horizontally to the front-rear surface or the left-right side surface of the base. A straight line orthogonal to the tangent and extending horizontally intersects the rounded portion at the end of the recess in the extending direction of the tangent. The distance from the tangent to the intersection where the straight line intersects the rounded part is longer than the vertical depth of the recess.

Therefore, by providing the vertical wall with a rounded portion that is relatively large in proportion to the depth of the recess, for example, by tilting the base, it is easy to discharge the solvent or the like from the recess. As a result, it is possible to prevent the solvent and the like from accumulating in the recesses. Therefore, the surface treatment can be applied substantially uniformly in the recesses, and the nickel plating can be applied substantially uniformly. This can suitably suppress corrosion between the nickel plating and the magnesium base around the recess.

According to another feature of the present disclosure, the rounded portion is a curved line sandwiched between two straight lines extending parallel to the front-rear surface or the left-right side surface when viewed from above. Therefore, the rounded portion is formed long between the two straight lines. Therefore, it is easy to suitably discharge the solvent or the like from the concave portion through the rounded portion. As a result, it is possible to more preferably suppress the accumulation of the solvent or the like in the concave portion. Therefore, the surface treatment can be applied substantially uniformly in the recesses, and the nickel plating can be applied substantially uniformly. This can suitably suppress corrosion between the nickel plating and the magnesium base around the recess.

According to another feature of the present disclosure, the recess has a bottom wall surrounded by a vertical wall and a connecting region connecting the vertical wall and the bottom wall and having an arc-shaped cross section. Therefore, it is possible to prevent the solvent and the like from accumulating on the peripheral edge of the bottom wall connected to the vertical wall. Therefore, the surface treatment can be applied substantially uniformly in the recesses, and the nickel plating can be applied substantially uniformly. This makes it possible to suppress corrosion between the nickel plating and the base in the recess.

Another feature of the present disclosure relates to a method for manufacturing a base for a portable processing machine that supports a tool main body portion and is brought into contact with a work material. The base molded body is plate-shaped and has an edge portion between the front and rear surfaces or the left and right side surfaces and the lower surface that stands adjacent to the lower surface (the corner portion of the base molded body is defined as "the corner portion of the base" to distinguish it from the corner portion of the base. Represented as "edge"). A base molded body having at least a part of an arc shape in cross section is molded using magnesium as a raw material using a molding die. Flatten the underside of the base molding by planing. Nickel plating is applied to the surface of the base.

Therefore, the base can be made lighter by providing it with magnesium. Moreover, by applying nickel plating, it is possible to provide a high-quality base having high hardness. Nickel plating can be applied substantially uniformly to the edge portion having at least a part having an arc shape in cross section. Therefore, it is possible to suppress the wear of the nickel plating at the edge and the corrosion between the nickel plating and the magnesium base. Further, it is possible to leave a cross-sectional arc shape at the corner portion of the base after flattening the lower surface of the base molded body. Therefore, it is possible to achieve both the formation of the lower surface of the base and the plating process of applying a substantially uniform nickel plating layer to the magnesium base.

According to other features of the present disclosure, the edges are arcuate in cross-section in the entire thickness direction. In plan cutting, the lower part of the arc-shaped cross section is scraped and the upper part is left. Therefore, nickel plating can be applied to the edge portion substantially uniformly so as to follow the cross-sectional arc shape of the edge portion in the entire thickness direction. An angle is formed at the lower end of the arc-shaped portion by flat cutting, but it is formed at a very blunt angle slightly smaller than 180 °. Therefore, the wear of the nickel plating at the corners of the base and the corrosion between the nickel plating and the magnesium base can be suitably suppressed.

According to other features of the present disclosure, the edge portion has a cross-sectional arc shape on the upper side and a straight cross-sectional shape on the lower side of the cross-sectional arc shape. In planing, the lower part or all of the straight cross section is cut. Therefore, it is easy to adjust the cutting allowance when flattening the lower surface of the base molded body. During mass production, the cutting allowance may vary. Even in such a case, since the shape (tilt angle) of the inclined surface portion and the lower inclined surface portion are the same, the shape after processing can be formed substantially the same.

According to other features of the present disclosure, the base molded body has a bulge portion that bulges downward from the edge portion from a region on the center side of the edge portion and is shaved in planing. Therefore, the base molded body is provided in a shape in which the convex shape of the bulging portion is separated from the edge portion. Therefore, it is possible to form a rounded chamfer with no corners at the corners of the base after flat cutting. As a result, nickel plating can be applied substantially uniformly at the corners of the base so as to follow the arcuate cross-sectional shape.

It is an overall perspective view of the portable processing machine which concerns on 1st Embodiment. It is a perspective view of the base which concerns on 1st Embodiment. It is a plan view of the base. It is a right side view of the base. FIG. 3 is a cross-sectional view taken along the line VV in FIG. 3, which is a vertical cross-sectional view of the base. FIG. 4 is an enlarged side view of the VI portion in FIG. It is a top view of the recess provided on the upper surface of a base. FIG. 7 is a cross-sectional view taken along the line VIII-VIII in FIG. 7, and is a vertical cross-sectional view of the recess. It is the side view of the base which concerns on 2nd Embodiment, and is the enlarged side view corresponding to the VI part in FIG. It is a top view of the recess provided on the upper surface of the base which concerns on 2nd Embodiment. It is a side view of the base which concerns on 3rd Embodiment, and is the enlarged side view corresponding to the VI part in FIG. It is a top view of the recess provided on the upper surface of the base which concerns on 3rd Embodiment. It is the side view of the base which concerns on 4th Embodiment, and is the enlarged side view corresponding to the VI part in FIG. It is a top view of the recess provided on the upper surface of the base which concerns on 4th Embodiment. It is a side view. It is a vertical cross-sectional view schematically showing the plating layer in the chamfered portion of a plane chamfered shape. It is a vertical cross-sectional view schematically showing the plating layer in the chamfered portion of a rounded chamfer shape.

<First Embodiment>
Next, the first embodiment of the present disclosure will be described with reference to FIGS. 1 to 8. As shown in FIG. 1, the portable processing machine 1 of the first embodiment is called a portable circular saw, and has a tool main body portion 10 and a rectangular flat plate-shaped base 2 that supports the tool main body portion 10. The tool body 10 rotatably supports the substantially disk-shaped cutting tool 11. The lower surface 2c (see FIG. 4) of the base 2 is formed in a planar shape and is in contact with the upper surface of the work material. The lower side of the cutting tool 11 can be projected toward the lower surface 2c side through the window portion 2a penetrating the base 2 in the vertical direction. The cutting tool 11 protruding to the lower surface 2c side is cut to cut the work material. The tool body portion 10 is provided with a handle portion 30 to be gripped by the user. The user grips the handle portion 30 located on the left side of the portable processing machine 1 in FIG. 1 and moves the handle portion 30 to the right to proceed with the cutting process. In the following description, regarding the front-rear direction of the member and the configuration, the direction in which the portable processing machine 1 is moved and the cutting process proceeds is the front side, and the user side is the rear side. The vertical and horizontal directions of the members and configurations are used with reference to the user.

As shown in FIG. 1, the tool main body 10 is supported above the base 2 via the front tilt support portion 5 and the rear tilt support portion 6 (see FIG. 2). The front tilting support portion 5 is composed of a fan-shaped front angular plate 17 attached to the front portion of the base 2 and a bracket 18 integrally connected to the tool body portion 10. The front angular plate 17 stands upward and is attached to the base 2 so that the center of the fan-shaped arc is located in front of the cutting tool 11. The front tilting support portion 5 has a left / right tilting support shaft 8 extending in the front-rear direction at a substantially central portion of the fan shape of the front side tilting support portion 17.

As shown in FIG. 1, a vertical swing support shaft 7 extending in the left-right direction is provided at the rear portion of the front angular plate 17. The bracket 18 is connected to the front angular plate 17 so as to be swingable in the vertical direction about the vertical swing support shaft 7. The tool body 10 connected to the bracket 18 can swing in the vertical direction about the vertical swing support shaft 7. By changing the vertical swing position of the tool body 10 with respect to the base 2, the protrusion dimension of the cutting tool 11 to the lower surface 2c side of the base 2 can be changed. This makes it possible to adjust the cutting depth of the cutting tool 11 with respect to the work material. The depth of cut of the cutting tool 11 can be adjusted by using the depth guide 9 attached to the left side of the fixing cover 15 described later.

As shown in FIG. 2, the rear tilting support portion 6 has a fan-shaped rear angular plate 2b that stands upward at the rear portion of the base 2. Unlike the front angular plate 17, the rear angular plate 2b is integrally formed with the base 2 by integral molding. The rear tilting support portion 6 has a left-right tilting support shaft 8 extending in the front-rear direction at a substantially central portion of the fan shape of the rear-side tilting support portion 2b. The left and right tilt support shafts 8 of the rear tilt support portion 6 and the front tilt support portion 5 are coaxial. As shown in FIG. 1, the tool main body 10 can be tilted left and right about the left and right tilt support shafts 8 of the front tilt support portion 5 and the rear tilt support portion 6. By tilting the tool body 10 to the left or right, it is possible to perform tilt cutting in which the cutting tool 11 is tilted with respect to the lower surface 2c of the base 2.

As shown in FIG. 1, a fixing cover 15 that covers a range of substantially the upper half circumference of the cutting tool 11 is attached to the tool body 10. On the right side surface of the fixed cover 15, a white arrow 15a indicating the rotation direction of the cutting tool 11 is displayed. A movable cover 16 capable of covering a range of approximately half the lower side of the cutting tool 11 is attached to the tool body 10. The movable cover 16 is supported so as to be openable and closable in the circumferential direction of the cutting tool 11 and spring-urged in the closing direction (counterclockwise in FIG. 1). When the movable cover 16 is closed by the spring-forced force, it covers a range of about half a circumference of the lower side of the cutting tool 11. When the movable cover 16 is opened against the force of the spring, the cutting edge of the peripheral edge of the cutting tool 11 is exposed. In normal cutting, the front end of the movable cover 16 is in contact with the end of the work piece, and the portable processing machine 1 is moved to the front side in the contacted state, so that the movable cover 16 resists the force of the spring. It will be opened gradually. An opening / closing lever 16a is provided on the right side of the movable cover 16. The user can grasp the opening / closing lever 16a to forcibly open / close the movable cover 16.

As shown in FIG. 1, a gear housing 22 is provided on the left side of the fixed cover 15. The gear housing 22 accommodates a reduction gear train (not shown). A motor housing 20 having a substantially cylindrical shape is provided on the left side of the gear housing 22. A motor 21 called a DC brushless motor is housed in the motor housing 20. The rotational output of the motor shaft of the motor 21 is decelerated via a reduction gear train housed in the gear housing 22 and transmitted to a spindle extending in the left-right direction. The right end side of the spindle is projected into the fixed cover 15 and the cutting tool 11 is attached. The cutting tool 11 is sandwiched between the outer flange 12 and the inner flange (not shown) in the direction perpendicular to the plane (left-right direction) in a posture orthogonal to the spindle. The pinched state of the cutting tool 11 is locked by the fixing bolt 13 tightened to the tip of the spindle. As a result, the cutting tool 11 is fixed to the spindle so that it cannot be displaced in the axial direction and cannot rotate around the axis.

As shown in FIG. 1, a handle portion 30 is provided on the upper portion of the tool main body portion 10. The front end portion of the handle portion 30 is connected to the upper part of the motor housing 20 and the gear housing 22. The handle portion 30 is formed in a loop shape extending rearward from the front end portion thereof. The loop-shaped portion of the handle portion 30 is provided as a grip portion 31 that the user grips by hand when using the portable processing machine 1. A trigger type switch lever 32 is provided on the upper inner peripheral side of the loop shape of the grip portion 31. When the switch lever 32 is pulled with the fingertip of the hand holding the grip portion 31, the motor 21 is activated and the cutting tool 11 is rotated. A lock-off button 33 that can be pushed is provided above the switch lever 32. By pressing the lock-off button 33, the locked state of the switch lever 32 is released and the switch lever 32 can be pulled. Therefore, the lock-off button 33 prevents the switch lever 32 from being inadvertently pulled.

The base 2 shown in FIGS. 3 and 4 is formed by using a molding die called a die-casting die using magnesium as a raw material, and after molding, the lower surface and the left and right side surfaces are flat-cut (planar cutting). be. The base 2 has a planar front surface 2d and a rear surface 2e extending in the vertical direction at the front end and the rear end having a substantially rectangular shape. The base 2 has a plate-shaped right side surface 2f and a left side surface 2g that stand up in the vertical direction at each of the left and right ends having a substantially rectangular shape. The front surface 2d, the rear surface 2e, the right side surface 2f, and the left side surface 2g are connected to the lower surface 2c of the base 2 by chamfering portions 3 whose corners are rounded off by an inclined plane or roundness, respectively. Hereinafter, "chamfering" is used as the meaning of both normal chamfering in which the corners are dropped by an inclined plane (planar chamfering) and round chamfering in which the corners are rounded off by rounding. Further, in the following, the chamfered portion is used as a meaning corresponding to the corner portion of the base and the edge portion of the base molded body in the present disclosure. The chamfered portion 3 is provided at the lower end portions of the front surface 2d, the rear surface 2e, the right side surface 2f, and the left side surface 2g. The front surface 2d and the right side surface 2f or the left side surface 2g, and the rear surface 2e and the right side surface 2f or the left side surface 2g are connected to each other by outer peripheral corner portions 3a corresponding to the substantially rectangular four corners of the base 2. Therefore, the chamfered portion 3 is also provided at the lower end portion of the outer peripheral corner portion 3a. The lower surface 2c, the right side surface 2f, and the left side surface 2g are flat surfaces after planing. Further, when the outer peripheral corner portion 3a is viewed in a plan view, it has a cross-sectional arc shape having an angle such that the outside of the roundness is cut out by the plane. This is because a rounded chamfer is formed on the outer peripheral corner portion in the state of the base molded body, and the right side surface and the left side surface are removed by planing from that state to form the right side surface 2f and the left side surface 2g of the base 2. Because.

As shown in FIG. 6, the chamfered portion 3 has an arc-shaped portion 3b of R1.0 having an arc-shaped cross section, and an inclined surface portion 3c having a linear cross section inclined at approximately 45 ° with respect to the lower surface 2c. The arc-shaped portion 3b is provided on the upper portion of the chamfered portion 3. The inclined surface portion 3c is provided at the lower part of the chamfered portion 3. The arc-shaped portion 3b and the inclined surface portion 3c are connected to each other so that the surfaces are smoothly continuous. More specifically, the straight line in the cross section of the inclined surface portion 3c is a tangent to the arc of the arc-shaped portion 3b. The surfaces of the arc-shaped portion 3b and the inclined surface portion 3c are smoothly continuous across the lower end portion of the front surface 2d (rear surface 2e), the lower end portion of the outer peripheral corner portion 3a, and the lower end portion of the right side surface 2f (left surface surface 2g) in the horizontal direction. It is formed to do. The chamfered portion (edge portion) 35a including the arc-shaped portion 3b and the inclined surface portion 3c is formed by using a molding die for molding the base molded body 35. Here, the base molded body 35 shows a state in which the base 2 and the removing portion 3e bulging below the lower surface 2c are integrated.

As shown in FIG. 6, in the base molded body 35, a region having a predetermined thickness is flattened from the lower end so that the lower surface 2c is formed in a plane at a predetermined height in the vertical direction. The removal portion 3e at the lower end of the base molded body 35 is scraped from the base molded body 35 by flat cutting with a machine tool such as a milling machine. As a result, the lower inclined surface portion 3d of the lower portion of the inclined surface portion 3c is scraped from the base 2. The inclination angle of the lower inclined surface portion 3d is the same as that of the inclined surface portion 3c, and both are on the same plane. The thickness of the removing portion 3e is set within a range in which the arc-shaped portion 3b remains entirely on the base 2 side when the removing portion 3e is scraped from the base molded body 35.

As shown in FIG. 3, a plurality of concave recesses 4 having a concave shape are provided on the upper surface 2h of the base 2 downward. The recess 4 is provided in a region extending in the front-rear direction on the left side of the window portion 2a and located below the tool main body portion 10 (see FIG. 1). The recess 4 is formed in a substantially rectangular shape that extends long in the front-rear direction and has an arc shape at each of the four corners when placed in a plan view. The plurality of recesses 4 are provided in the same shape, and are arranged at substantially equal intervals in the front-rear direction and the left-right direction.

As shown in FIGS. 5, 7 and 8, the recess 4 is surrounded by a vertical wall 4a that stands up in the vertical direction. The vertical wall 4a has a rounded portion 4b having an arc shape in a plan view at four corners having a substantially rectangular shape. The radii of the four rounded portions 4b correspond to the distance T shown in FIG. The distance T is calculated as shown below. The tangent line L1 extends in the front-rear direction and touches one rounded portion 4b. The tangent line L2 extends in the left-right direction orthogonal to the tangent line L1 and touches the same rounded portion 4b. The distance T is the distance between the tangent line L1 and the intersection P where the tangent line L2 touches the rounded portion 4b.

As shown in FIGS. 5 and 8, the recess 4 has a bottom wall 4c surrounded by a vertical wall 4a. The bottom wall 4c extends in the horizontal direction parallel to the lower surface 2c and is formed in a planar shape. The bottom wall 4c is formed at a depth D with respect to the upper surface 2h. The depth D of the recess 4 is smaller than the above-mentioned distance T (see FIG. 7). Therefore, the recess 4 has a shallow bottom shape in which the depth in the vertical direction is smaller than the length in the horizontal direction. The connecting region 4d to which the bottom wall 4c and the vertical wall 4a are connected is formed in an arc shape in cross section. The connecting region 4e where the vertical wall 4a and the upper surface 2h of the recess 4 intersect is also formed in an arc shape in cross section. Here, the connecting region has a cross-sectional arc shape of R1.0.

In the base 2 shown in FIG. 2, a base molded body is first molded by so-called die casting using a molding die using magnesium as a raw material. As shown in FIG. 6, the base molded body 35 is flattened so that the lower surface 2c has a planar shape extending in the horizontal direction. Further, the right side surface 2f and the left side surface 2g are also flattened so as to have a planar shape extending in the vertical direction. As a result, the removed portion 3e that bulges below the base molded body 35 is scraped. After planing, a solvent for base treatment is applied to the surface of the base 2 as a base treatment for improving the adhesion of plating. After removing the solvent accumulated on the surface of the base 2, the surface of the base 2 is nickel-plated. This provides a nickel-plated layer that covers the surface of the base 2.

The base 2 shown in FIG. 5 is formed so that the wall thickness N is approximately 2 mm. Specifically, the wall thickness of the base molded body 35 (see FIG. 6) is approximately 2.5 mm, and the removed portion 3e is removed by 0.5 mm. The thickness of the nickel-plated layer provided on the surface of the base 2 is 10 μm or more, preferably 10 to 20 μm. Therefore, the thickness of the nickel-plated layer is 1/200 or more of the wall thickness N of the base 2, preferably 1/200 to 1/100 of the wall thickness N of the base 2.

The thickness of the nickel-plated layer in the chamfered portion will be described with reference to FIGS. 15 and 16. As shown in FIG. 15, a chamfered portion 71 having a flat surface chamfered at an inclined plane is provided on the lower edge of the base 70. The base molded body 76 of the base 70 has a chamfered portion (edge portion) 76a whose lower end edge is chamfered in a plane. A lower surface 72 is formed by flat-cutting a removing portion 73 having a predetermined thickness from the lower end of the base molded body 76. After that, a nickel plating layer is applied to the surface of the base 70. The plating layer 74 has a substantially constant thickness on the lower surface 72, the front-rear surface, and the left and right side surfaces of the base 70. However, the chamfered portion 71 has corners at both the upper and lower ends. And it is difficult for plating to be placed on the corners 75 of the chamfered portion 71. This is because the nickel-plated layer is a solidified liquid solution, and due to the nature of the liquid, the solution layer is parallel to the flat surface on the flat surface of the base 70, but at the angle 75, the surface of the liquid is at an angle (edge). This is because it has the property of being less likely to become. As a result, the thickness of the plating layer 74 may be reduced in the chamfered portion 71. Therefore, it is difficult to sufficiently suppress wear and corrosion around the chamfered portion 71.

As shown in FIG. 16, a chamfered portion 81 having a rounded chamfer with an arcuate cross-sectional shape is provided on the lower edge of the base 80. The chamfered portion 86 of the base molded body 85 of the base 80 has a rounded chamfered shape on the upper side and a flat chamfered shape chamfered by an inclined plane below the rounded chamfered shape. A lower surface 82 is formed by flat-cutting a removing portion 83 having the same thickness as the flat chamfer shape from the lower end of the base molded body 85. Therefore, the chamfered portion 81 having an arc-shaped cross section is smoothly connected to the lower surface 82, the front-rear surface, and the left and right side surfaces in the state after flat cutting. Therefore, the lower end portion of the base 80 is provided without having an angular shape such as a corner 75 (see FIG. 15). Therefore, the plating layer 84 applied to the surface of the base 80 is provided with a substantially constant thickness on any of the chamfered portion 81, the lower surface 82, the front-rear surface, and the left and right side surfaces of the base 80. As a result, the chamfered portion 81 is suppressed from being worn or corroded by the plating layer 84 in the same manner as the other portions of the base 80.

As described above, the portable processing machine 1 accommodates the motor 21 as shown in FIG. 1, and has a tool body portion 10 that supports the cutting tool 11 rotated by the motor 21 and a tool with the cutting tool 11 projected downward. It has a base 2 having a lower surface 2c that supports the main body 10 and is brought into contact with the work piece. The base 2 is made of magnesium and has a nickel-plated layer on the surface.

Therefore, the base 2 of the portable processing machine 1 can be made lighter by providing it with magnesium. Moreover, by applying nickel plating, the base 2 having high hardness can be provided. Further, by applying nickel plating, the appearance of the base 2 can be enhanced.

As shown in FIG. 5, the nickel-plated layer has a thickness of 1/200 to 1/100 with respect to the wall thickness N of the base 2. Therefore, the nickel-plated layer is provided thicker than a general plating layer which is approximately 1/200 or less with respect to the wall thickness N of the base 2. Wear can be suppressed by providing a thick nickel-plated layer. Further, the strength of the base 2 can be improved by increasing the relative thickness of the nickel-plated layer with respect to the wall thickness N of the base 2 to increase the hardness. Further, corrosion between the nickel plating and the base 2 can be prevented. Thus, the base 2 can be maintained in a state of having high hardness and a sense of quality.

As shown in FIGS. 2 and 6, the base 2 has a chamfered portion 3 between the lower surface 2c and the front and rear surfaces 2d and 2e or the left and right side surfaces 2f and 2g that stand adjacent to the lower surface 2c. The upper portion of the chamfered portion 3 is an arc-shaped portion 3b having an arc-shaped cross section. Therefore, the chamfered portion 3 having a convex shape is provided with the arc-shaped portion 3b having an arc-shaped cross section. Therefore, nickel plating or surface treatment can be applied to the chamfered portion 3 substantially uniformly along the cross-sectional arc shape of the arc shape portion 3b. As a result, wear of the nickel plating in the chamfered portion 3 can be suppressed. Since the chamfered portion 3 is located at the edge of the lower surface 2c that comes into contact with the work material, wear is likely to occur. Therefore, the wear of the nickel plating on the magnesium base 2 can be suitably suppressed. Further, corrosion between the nickel plating and the magnesium base 2 in the chamfered portion 3 can be suppressed.

As shown in FIGS. 3, 4, and 6, the four outer peripheral corner portions 3a connecting the front and rear surfaces 2d and 2e and the left and right side surfaces 2f and 2g, respectively, have a cross-sectional arc shape having angles as described above in a plan view. A chamfered portion 3 having an arc-shaped portion 3b having an arc-shaped cross section is located at the lower end portion of the outer peripheral corner portion 3a. Therefore, the outer peripheral corner portion 3a has a cross-sectional arc shape in the horizontal direction and the vertical direction. Therefore, the outer peripheral corner portion 3a is three-dimensionally rounded. Therefore, the outer peripheral corner portion 3a can be subjected to nickel plating or surface treatment before nickel treatment substantially uniformly along the arc shape in the vertical direction and the horizontal direction. As a result, wear of the nickel plating at the outer peripheral corner portion 3a and corrosion between the nickel plating and the magnesium base 2 can be suppressed.

As shown in FIG. 6, the chamfered portion 3 has an arc-shaped portion 3b which is a curved surface having an arc-shaped cross section, and a linear cross-sectional portion which is adjacent to the arc-shaped portion 3b below the arc-shaped portion 3b and is inclined with respect to the lower surface 2c. It has an inclined surface portion 3c. Therefore, the nickel plating layer is applied to the arc-shaped portion 3b with a substantially uniform thickness. Further, when the lower portion of the base molded body 35 is removed to form the lower surface 2c, the thickness of the removed portion 3e to be removed may vary. Also in this case, the angle formed by the inclined surface portion 3c and the lower surface portion 2c can be provided in the same angle shape. Moreover, this angle can be provided at a blunt angle. Therefore, the thickness of the nickel plating layer is unlikely to be thinned at the corner formed by the inclined surface portion 3c and the lower surface portion 2c. Thus, it is possible to suppress variations in the thickness of the nickel-plated layer in the chamfered portion 3.

As shown in FIG. 7, a recess 4 is provided on the upper surface 2h of the base 2. The recess 4 is surrounded by a vertical wall 4a that stands up in the vertical direction. The vertical wall 4a has a rounded portion 4b that is curved when viewed from above. Here, the length of the recess 4 in the front-rear direction is 25 mm, and the length in the left-right direction is 15 mm. The rounded portion 4b is a rounded chamfer of R6.0. The tangent line L1 in contact with the rounded portion 4b extends in the front-rear direction parallel to the left and right side surfaces 2f and 2g of the base 2 (see FIG. 3) and extends horizontally. The tangent line L2 orthogonal to the tangent line L and extending horizontally intersects the rounded portion 4b at the end of the recess 4 in the extending direction of the tangent line L1. The distance from the tangent line L1 to the intersection P where the tangent line L2 intersects the rounded portion 4b is longer than the vertical depth D of the recess 4 (see FIG. 8). Here, the depth D is 5 mm and the distance T is 6 mm.

Therefore, by providing the vertical wall 4a with a rounded portion 4b that is relatively large in proportion to the depth D of the recess 4, for example, by tilting the base 2, it is easy to discharge the solvent or the like from the recess 4. As a result, it is possible to prevent the solvent and the like from accumulating in the recess 4. Therefore, the surface treatment can be applied substantially uniformly in the recess 4, and the nickel plating can be applied substantially uniformly. As a result, corrosion between the nickel plating and the magnesium base 2 around the recess 4 can be suitably suppressed.

As shown in FIGS. 5 and 8, the recess 4 has a bottom wall 4c surrounded by the vertical wall 4a, and a connecting region 4d that connects the vertical wall 4a and the bottom wall 4c and has an arc-shaped cross section. Therefore, it is possible to prevent the solvent and the like from accumulating in the connecting region 4d. Therefore, the surface treatment can be applied substantially uniformly in the recess 4, and the nickel plating can be applied substantially uniformly. As a result, corrosion between the nickel plating in the recess 4 and the base 2 can be suppressed. Here, the connecting region 4d has a cross-sectional arc shape of R1.0.

As shown in FIGS. .. The base molded body 35 having the arc-shaped portion 3b of the chamfered portion 35a having an arc-shaped cross section is molded using magnesium as a raw material using a molding die. The lower surface of the base molded body 35 is flattened by planing. Nickel plating is applied to the surface of the base 2.

Therefore, the base 2 can be made lighter by providing it with magnesium. Moreover, by applying nickel plating, it is possible to provide a base 2 having a high hardness and a high-class feeling. Nickel plating can be substantially uniformly applied to the chamfered portion 3 having the arc-shaped portion 3b having an arc-shaped cross section. Therefore, it is possible to suppress the wear of the nickel plating in the chamfered portion 3 and the corrosion between the nickel plating and the magnesium base 2. Further, the arc-shaped portion 3b can be left on the base 2 in the chamfered portion 3 after the lower surface of the base molded body 35 is flattened. Therefore, it is possible to achieve both the formation of the lower surface 2c of the base 2 and the plating process of applying a substantially uniform nickel plating layer to the magnesium base 2.

As shown in FIG. 6, the chamfered portion 3 has an arc-shaped portion 3b having an arc-shaped cross section on the upper side, and an inclined surface portion 3c having a linear cross-section below the arc-shaped cross-section. In flat cutting, the lower inclined surface portion 3d of the lower portion of the inclined surface portion 3c is cut. Therefore, it is easy to adjust the cutting allowance when flattening the lower surface of the base molded body 35. For example, what was intended to be cut with a cutting allowance of 0.5 mm may become 0.6 mm or 0.4 mm due to variations during mass production. Even in such a case, since the shape (tilt angle) of the inclined surface portion 3c and the lower inclined surface portion 3d are the same, the shape after processing can be formed substantially the same.

<Second Embodiment>
Next, the second embodiment of the present disclosure will be described with reference to FIGS. 9 to 10. In the following description, the portable processing machine 40 of the second embodiment will be described in detail only in a configuration different from that of the portable processing machine 1 of the first embodiment. As shown in FIG. 9, the portable processing machine 40 has a base 41 provided with a chamfering portion 42 having a shape different from that of the chamfering portion 3 (see FIG. 6) of the portable processing machine 1. As shown in FIG. 10, the base 41 has a recess 43 having a shape different from that of the recess 4 (see FIG. 7) of the portable processing machine 1.

As shown in FIG. 9, the chamfered portion 42 is provided at the lower end portion of the front surface 41b to which the lower surface 41a and the front surface 41b of the base 41 are connected and the lower end portion of the right side surface 41c to which the lower surface 41a and the right side surface 41c are connected. There is. The chamfered portion 42 is also provided at the lower end portion of the outer peripheral corner portion 42a in which the front surface 41b and the right side surface 41c are connected to each other. Although the rear surface and the left side surface of the base 41 are not visible in the figure, a chamfered portion 42 is similarly provided at the lower end portion.

As shown in FIG. 9, the chamfered portion 42 has an arc-shaped portion 42b having an arc-shaped cross section of R1.0. The base molded body 45 before flattening the base 41 includes a removing portion 42d that bulges downward from the lower surface 41a. The arc-shaped portion 42b is formed so as to smoothly connect the front surface 41b or the right side surface 41c and the lower surface of the removing portion 42d in a cross-sectional arc shape. In other words, the arc-shaped portion 42b has a curved surface shape that connects the front surface 41b or the right side surface 41c and the virtual plane 42e parallel to the lower surface 41a below the lower surface 41a in a cross-sectional arc shape. The arc-shaped portion 42b is formed so that the surface of the arc-shaped portion 42b is smoothly continuous over the lower ends of the front surface 41b, the outer peripheral corner portion 42a, and the right side surface 41c in the horizontal direction. The arc-shaped portion 42b is formed by using a molding die for molding the base molded body 45. When the removing portion 42d is scraped, the lower arc-shaped portion 42c of the lower portion of the arc-shaped portion 42b is scraped from the base 41. The thickness of the removing portion 42d is set so that at least a part of the arc-shaped portion 42b is set on the base 41 side within a range.

As shown in FIG. 10, the upper surface of the base 41 is provided with a concave recess 43 facing downward. A plurality of recesses 43 are provided in the same manner as the recesses 4 (see FIG. 3), and are arranged at substantially the same positions as the recesses 4. The concave portion 43 is connected in a direction in which the concave sides of two arcs having the same diameter are opposed to each other in a plan view, and the distance connecting the points where the two arcs are connected (intersection point P) is the distance between the two arcs (distance T). It is made longer than twice), and the straight line connecting the connection points is formed in a posture along the front-back direction. Here, the length of the recess 43 in the front-rear direction (distance from the straight line L4 to the straight line L5, which will be described later) is 25 mm, and the length in the left-right direction is 15 mm. The distance T is 7.5 mm.

As shown in FIG. 10, the recess 43 is surrounded by a vertical wall 43a that stands up in the vertical direction. The vertical wall 43a has an arc shape in a plan view and is composed of a pair of left and right rounded portions 43b. The tangent line L1 extends in the front-rear direction and touches one rounded portion 43b. The straight line L4 extends in the left-right direction orthogonal to the tangent line L1 and intersects the front end of the same rounded portion 43b at the intersection P. A round chamfer of R1.0 is formed at the intersection P. The straight line L5 extends parallel to the straight line L4 and intersects the rear end of the same rounded portion 43b at a position facing the straight line L4 with the recess 43 interposed therebetween. The rounded portion 43b is formed in a curved shape sandwiched between the straight line L4 and the straight line L5. The rounded portion 43b has an arc shape with a radius of 15 mm.

As shown in FIG. 10, the recess 43 has a flat bottom wall 43c surrounded by a vertical wall 43a. The cross-sectional arrow view of the recess 43 in FIG. 10 has the same shape as the cross-sectional arrow view of the recess 4 shown in FIG. Therefore, the bottom wall 43c is formed at a depth D with respect to the upper surface of the base 41. The depth D of the recess 43 is smaller than the distance T described above. The bottom wall 43c and the vertical wall 43a are connected to each other by a connecting region having an arc-shaped cross section.

As described above, a recess 43 is provided on the upper surface of the base 41 of the portable processing machine 40 as shown in FIG. The rounded portion 43b included in the vertical wall 43a of the recess 43 is a curved shape sandwiched between two tangents L1 and L3 extending in parallel to each other and in contact with the rounded portion 43b when viewed from above. Therefore, the rounded portion 43b is formed long between the two tangents L1 and L3. Therefore, it is easy to suitably discharge the solvent or the like from the concave portion 43 through the rounded portion 43b. As a result, it is possible to more preferably suppress the accumulation of the solvent or the like in the recess 43. Therefore, the surface treatment can be applied substantially uniformly in the recess 43, and the nickel plating can be applied substantially uniformly. This makes it possible to suitably suppress corrosion between the nickel plating and the magnesium base 41 around the recess 43.

As shown in FIG. 9, the chamfered portion 42 has a curved surface having an arc-shaped cross section connecting the front surface 41b or the right side surface 41c and the virtual plane 42e. The virtual plane 42e is parallel to the lower surface 41a below the lower surface 41a. Therefore, with respect to the base molded body 45 of the base 41 before the lower surface 41a is flattened, the chamfered portion (edge portion) 45a at the lower end portion can be formed into a so-called rounded chamfered shape. Therefore, the chamfered portion 45a of the base molded body 45 can be made into a simple shape. As a result, a mold for molding the base molded body 45 can be easily manufactured.

As shown in FIG. 9, the chamfered portion 42 has an arc-shaped portion 42b having an arc-shaped cross section in the entire thickness direction of the base 41. In flat cutting, the lower arc-shaped portion 42c of the lower portion of the arc-shaped portion 42b is scraped and the upper portion is left. Therefore, nickel plating can be substantially uniformly applied to the chamfered portion 42 so as to follow the cross-sectional arc shape of the chamfered portion 42 in the entire thickness direction. An angle is formed at the lower end of the arc-shaped portion 42b by planing, but the angle is formed at a very blunt angle slightly smaller than 180 °. As a result, the film thickness of the plating does not easily become thin even at the corners. Therefore, the wear of the nickel plating in the chamfered portion 42 and the corrosion between the nickel plating and the magnesium base 41 can be suitably suppressed.

<Third Embodiment>
Next, the third embodiment of the present disclosure will be described with reference to FIGS. 11 to 12. In the following description, the portable processing machine 50 of the third embodiment will be described in detail only in a configuration different from that of the portable processing machine 1 of the first embodiment. As shown in FIG. 11, the portable processing machine 50 has a base 51 having a chamfering portion 52 having a shape different from that of the chamfering portion 3 (see FIG. 6) of the portable processing machine 1. As shown in FIG. 12, the base 51 has a recess 53 having a shape different from that of the recess 4 (see FIG. 7) of the portable processing machine 1.

As shown in FIG. 11, the chamfered portion 52 is provided at the lower end portion of the front surface 51b to which the lower surface 51a and the front surface 51b of the base 51 are connected and the lower end portion of the right side surface 51c to which the lower surface 51a and the right side surface 51c are connected. There is. The chamfered portion 52 is also provided at the lower end portion of the outer peripheral corner portion 52a in which the front surface 51b and the right side surface 51c are connected to each other. Although the rear surface and the left side surface of the base 51 are not visible in the figure, a chamfered portion 52 is similarly provided at the lower end portion.

As shown in FIG. 11, the chamfered portion 52 has an arc-shaped portion 52b having an arc-shaped cross section of R1.0. The base molded body 55 before flattening the base 51 has a removing portion (bulging portion) 52c that bulges below the lower surface 51a. The removing portion 52c is provided in a region closer to the center of the base 51 than the chamfered portion 52. The arc-shaped portion 52b is formed so that the surface of the arc-shaped portion 52b is smoothly continuous over the lower ends of the front surface 51b, the outer peripheral corner portion 52a, and the right side surface 51c in the horizontal direction. The arc-shaped portion 52b is formed by using a molding die for molding the base molded body 55. When the removing portion 52c is scraped, all the arc-shaped portions 52b remain on the base 51 side. The arc-shaped portion 52b is finished in a shape in which the front surface 51b or the right side surface 51c and the lower surface 51a are smoothly connected in a cross-sectional arc shape.

As shown in FIG. 12, the upper surface of the base 51 is provided with a concave recess 53 facing downward. A plurality of recesses 53 are provided in the same manner as the recesses 4 (see FIG. 3), and are arranged at substantially the same positions as the recesses 4. The recess 53 is formed in a substantially rectangular shape that extends long in the front-rear direction when placed in a plan view and has a front portion and a rear portion connected in a semicircular shape. The recess 53 has a length in the front-rear direction of 25 mm and a length in the left-right direction of 15 mm. The recess 53 is surrounded by a vertical wall 53a that stands up in the vertical direction. The vertical wall 53a has a semicircular rounded portion 53b at the front portion and the rear portion in a plan view. The tangent line L1 extends in the front-rear direction, the tangent line L2 extends in the left-right direction orthogonal to the tangent line L1, and each of them touches the same rounded portion 53b. The tangent line L3 extends in parallel with the tangent line L1 at a position facing the tangent line L1 with the recess 53 interposed therebetween and touches the same rounded portion 53b. The rounded portion 53b is formed in a curved shape sandwiched between the tangent line L1 and the tangent line L3. Therefore, the radius of the rounded portion 52b is 7.5 mm. The radius of the rounded portion 53b corresponds to the distance T (7.5 mm) between the tangent line L1 and the intersection P where the tangent line L2 touches the rounded portion 53b.

As shown in FIG. 12, the recess 53 has a flat bottom wall 53c surrounded by a vertical wall 53a. The cross-sectional arrow view of the recess 53 in FIG. 12 has the same shape as the cross-sectional arrow view of the recess 4 shown in FIG. Therefore, the bottom wall 53c is formed at a depth D with respect to the upper surface of the base 51. The depth D of the recess 53 is 5 mm, which is smaller than the above-mentioned distance T. The bottom wall 53c and the vertical wall 53a are connected to each other by a connecting region having an arc-shaped cross section.

As described above, as shown in FIG. 11, the base molded body 55 according to the base 51 bulges downward from the region on the center side of the base 51 with respect to the chamfered portion (edge portion) 55a, and in flat cutting. It has a removing portion 52c to be scraped. Therefore, the base molded body 55 is provided in a shape in which the convex shape of the removing portion 52c is separated from the chamfered portion 55a. Therefore, it is possible to form a rounded chamfer having no corners on the chamfered portion 52 of the base 51 after flat cutting. As a result, nickel plating can be substantially uniformly applied to the chamfered portion 52 along the arc-shaped portion 52b having an arc-shaped cross section.

<Fourth Embodiment>
Next, the fourth embodiment of the present disclosure will be described with reference to FIGS. 13 to 14. In the following description, the portable processing machine 60 of the fourth embodiment will be described in detail only in a configuration different from that of the portable processing machine 1 of the first embodiment. As shown in FIG. 13, the portable processing machine 60 has a base 61 having a chamfering portion 62 having a shape different from that of the chamfering portion 3 (see FIG. 6) of the portable processing machine 1. As shown in FIG. 14, the base 61 has a recess 63 having a shape different from that of the recess 4 (see FIG. 7) of the portable processing machine 1.

As shown in FIG. 13, the chamfered portion 62 is provided at the lower end portion of the front surface 61b to which the lower surface 61a and the front surface 61b of the base 61 are connected and the lower end portion of the right side surface 61c to which the lower surface 61a and the right side surface 61c are connected. There is. The chamfered portion 62 is also provided at the lower end portion of the outer peripheral corner portion 62a in which the front surface 61b and the right side surface 61c are connected to each other. Although the rear surface and the left side surface of the base 61 are not visible in the figure, a chamfered portion 62 is similarly provided at the lower end portion.

As shown in FIG. 13, the chamfered portion 62 has an inclined surface portion 62b having a straight cross section at the upper portion and inclined at approximately 45 ° with respect to the lower surface 61a, and an arc shape of R1.0 having an arcuate cross section at the lower portion. It has a portion 62c. The inclined surface portion 62b is formed by using a molding die for molding a base molded body. The arc-shaped portion 62c is formed into an arc-shaped cross section by cutting when the lower surface 61a is formed into a flat surface by flat cutting. The arc-shaped portion 62c smoothly connects the front surface 61b or the right side surface 61c and the lower surface 61a in a cross-sectional arc shape.

As shown in FIG. 14, the upper surface of the base 61 is provided with a concave recess 63 facing downward. A plurality of recesses 63 are provided in the same manner as the recesses 4 (see FIG. 3), and are arranged at substantially the same positions as the recesses 4. The length of the recess 63 in the front-rear direction is 25 mm, and the length in the left-right direction is 15 mm. The recess 63 is formed in an elliptical shape that is long in the front-rear direction when placed in a plan view. This ellipse is an ellipse defined by a major axis of 25 mm and a minor axis of 15 mm. The recess 63 is surrounded by a vertical wall 63a that stands up in the vertical direction. The vertical wall 63a has an elliptical rounded portion 63b in a plan view. The tangent line L1 extends in the front-rear direction, and the tangent line L2 extends in the left-right direction orthogonal to the tangent line L1 and touches the rounded portion 63b. The tangent line L3 extends in parallel with the tangent line L1 at a position facing the tangent line L1 with the recess 63 interposed therebetween and touches the rounded portion 63b. The rounded portion 63b is formed in a curved shape sandwiched between the tangent line L1 and the tangent line L3. The minor axis of the rounded portion 63b corresponds to the distance T between the tangent line L1 and the intersection P where the tangent line L2 touches the rounded portion 63b. Here, the distance T is one half of the minor axis, so it is 7.5 mm.

As shown in FIG. 14, the recess 63 has a flat bottom wall 63c surrounded by a vertical wall 63a. The cross-sectional arrow view of the recess 63 in FIG. 14 has the same shape as the cross-sectional arrow view of the recess 4 shown in FIG. Therefore, the bottom wall 63c is formed at a depth D with respect to the upper surface of the base 61. The depth D of the recess 63 is smaller than the above-mentioned distance T and is 5 mm. The bottom wall 63c and the vertical wall 63a are connected to each other by a connecting region having an arc-shaped cross section.

<Other variants>
Various changes can be made to the portable processing machines 1, 40, 50, 60 of the first to fourth embodiments described above. Although a portable processing machine called a portable circular saw has been exemplified, the present invention can be applied to other portable processing machines such as jigsaws, routers, and portable canna. An example is shown in which a magnesium base is provided with a nickel-plated layer having a thickness of 1/200 to 1/100 with respect to the wall thickness N of the base. Instead of this, a nickel-plated layer having a thickness of 1/200 to 1/100 with respect to the wall thickness N of the base may be applied to the aluminum base. By applying a nickel plating layer thicker than the conventional plating layer, wear of the nickel plating can be suppressed, and corrosion between the nickel plating and the aluminum base can be suppressed.

The arc-shaped portion of the chamfered portion may be provided at the time of die casting or may be provided at the time of shaving the base. As for the arc-shaped portion of the chamfered portion, a cross-sectional arc shape (so-called R-shape) that is easy to form is exemplified, but the cross-sectional shape may be an elliptical shape or the like, for example. The arcuate portion of the chamfered portion may be formed with a large diameter at the front portion of the base, which easily comes into contact with the work material, and may be formed with a smaller diameter at the rear portion of the base. As for the inclined surface portion of the chamfered portion, an inclined surface (so-called C surface) inclined at 45 ° with respect to the lower surface is exemplified for easy molding. Alternatively, it can be applied, for example, when the inclination angle with respect to the lower surface is smaller than or larger than 45 °.

The concave portion provided on the upper surface of the base may have a shape having a longitudinal direction in the left-right direction, for example. A plurality of recesses may be formed individually or partially having different shapes. A plurality of recesses may be formed individually or partially having different sizes. A plurality of recesses may be arranged in a zigzag shape in the left-right direction, for example, or may be arranged irregularly.

1 ... Portable processing machine 2 ... Base, 2a ... Window part, 2b ... Rear side angular plate, 2c ... Bottom surface 2d ... Front surface, 2e ... Rear surface, 2f ... Right side surface, 2g ... Left side surface, 2h ... Top surface 3 ... Chamfered part (Corner portion), 3a ... Outer peripheral corner portion, 3b ... Arc-shaped portion, 3c ... Inclined surface portion 3d ... Lower inclined surface portion, 3e ... Removal portion 4 ... Recessed portion, 4a ... Vertical wall, 4b ... Rounded portion, 4c ... Bottom wall 4, 4d, 4e ... Connecting area 5 ... Front tilting support 6 ... Rear tilting support 7 ... Vertical swing support shaft 8 ... Left and right tilting support shaft 9 ... Depth guide 10 ... Tool body 11 ... Cutting tool 12 ... Outer flange 13 ... Fixing bolt 15 ... Fixed cover, 15a ... (Indicating the direction of rotation of the cutting tool) White arrow 16 ... Movable cover, 16a ... Opening / closing lever 17 ... Front angular plate 18 ... Bracket 20 ... Motor housing 21 ... Motor 22 ... Gear housing 30 ... Handle part 31 ... Grip part 32 ... Switch lever 33 ... Lock-off button 35 ... Base molded body, 35a ... Chamfered part (edge part)
40 ... Portable processing machine (second embodiment)
41 ... Base, 41a ... Bottom surface, 41b ... Front surface, 41c ... Right side surface 42 ... Chamfered portion (corner portion), 42a ... Outer peripheral corner portion, 42b ... Arc-shaped portion, 42c ... Lower arc portion 42d ... Removal portion, 42e ... Virtual plane 43 ... concave, 43a ... vertical wall, 43b ... rounded portion, 43c ... bottom wall 45 ... base molded body, 45a ... chamfered portion (edge)
50 ... Portable processing machine (third embodiment)
51 ... Base 51a ... Bottom surface, 51b ... Front surface, 51c ... Right side surface 52 ... Chamfered portion (corner portion), 52a ... Outer peripheral corner portion, 52b ... Arc-shaped portion 52c ... Removal portion (bulging portion)
53 ... concave, 53a ... vertical wall, 53b ... rounded part, 53c ... bottom wall 55 ... base molded body, 55a ... chamfered part (edge)
60 ... Portable processing machine (fourth embodiment)
61 ... Base 61a ... Bottom surface, 61b ... Front surface, 61c ... Right side surface 62 ... Chamfered portion (corner portion), 62a ... Outer peripheral corner portion, 62b ... Inclined surface portion, 62c ... Arc-shaped portion 63 ... Recessed portion, 63a ... Vertical wall, 63b Rounded portion, 53c ... Bottom wall 70 ... Base, 71 ... Chamfered portion (corner portion), 72 ... Bottom surface, 73 ... Removed portion, 74 ... Plated layer 75 ... Square 76 ... Base molded body, 76a ... Chamfered portion (edge) Department)
80 ... base, 81 ... chamfered part (corner part), 82 ... lower surface, 83 ... removed part, 84 ... plated layer 85 ... base molded body, 86 ... chamfered part (edge part)
D ... Depth L1, L2, L3 ... Tangent (straight line), L4, L5 ... Straight line P ... Intersection,
T ... distance N ... wall thickness

Claims (13)

It ’s a portable processing machine.
A tool body that houses an electric motor and supports a cutting tool that is rotated by the electric motor,
It has a base having a lower surface that supports the tool body portion and is in contact with the work material in a state where the cutting tool is projected downward.
The base is a portable processing machine made of magnesium and having a nickel-plated layer on the surface. The portable processing machine according to claim 1.
The nickel-plated layer is a portable processing machine having a thickness of 1/200 to 1/100 of the wall thickness of the base. The portable processing machine according to claim 1 or 2.
The base has a corner portion between the lower surface and the front-rear surface or the left-right side surface that stands adjacent to the lower surface.
A portable processing machine having an arc-shaped cross section at least a part of the corner portion. The portable processing machine according to claim 3.
At least one outer peripheral corner portion of the four outer peripheral corner portions connecting the front-rear surface and the left-right side surface has a cross-sectional arc shape in a plan view, and at least a part thereof has a cross section at the lower end portion of the at least one outer peripheral corner portion. A portable processing machine in which the corners having an arc shape are located. The portable processing machine according to claim 3 or 4.
The corner portion is a portable processing having an arc-shaped portion which is a curved surface having an arc-shaped cross section and an inclined surface portion having a linear cross section which is adjacent to the arc-shaped portion and is inclined with respect to the lower surface below the arc-shaped portion. Machine. The portable processing machine according to claim 3 or 4.
The corner portion is a portable processing machine having a curved surface having an arcuate cross section connecting the front-rear surface or the left-right side surface and a virtual plane parallel to the lower surface below the lower surface. The portable processing machine according to any one of claims 1 to 6.
A recess is provided on the upper surface of the base.
The recess is surrounded by a vertical wall that stands up in the vertical direction.
The vertical wall has a rounded portion that is curved when viewed from above.
A straight line extending horizontally and parallel to the front-rear surface or the left-right side surface of the base and tangent to the rounded portion, and extending horizontally and orthogonal to the tangent line, is the end of the recess in the extending direction of the tangent line. A portable processing machine in which the distance to the intersection where the rounded portion intersects is longer than the vertical depth of the recess. The portable processing machine according to claim 7.
The rounded portion is a portable processing machine having a curved shape sandwiched between two straight lines extending in parallel with the front-rear surface or the left-right side surface when viewed from above. The portable processing machine according to claim 7 or 8.
The recess is a portable processing machine having a bottom wall surrounded by the vertical wall and a connecting region connecting the vertical wall and the bottom wall and having a cross-sectional arc shape. It is a manufacturing method of a base for a portable processing machine that supports the tool body and comes into contact with the work material.
Magnesium is used as a raw material for a base molded body having an edge portion between the front and rear surfaces or left and right side surfaces that are plate-shaped and stand adjacent to the lower surface and the lower surface, and at least a part of the edge portion has an arc-shaped cross section. Molded using a molding mold as
The lower surface of the base molded product is flattened by planing.
A method for manufacturing a base for portable processing machines that has a nickel-plated surface. The method for manufacturing a base for a portable processing machine according to claim 10.
The edge portion has a cross-sectional arc shape in the entire thickness direction, and a method for manufacturing a base for a portable processing machine in which a lower portion of the cross-sectional arc shape is shaved and an upper portion is left in the plan cutting. The method for manufacturing a base for a portable processing machine according to claim 10.
The edge portion has a circular arc shape on the upper side, a linear cross section on the lower side than the arc shape on the cross section, and is used for a portable processing machine in which the lower portion or the entire linear cross section is cut in the plan cutting. How to make the base. The method for manufacturing a base for a portable processing machine according to claim 10.
A method for manufacturing a base for a portable processing machine, wherein the base molded body bulges downward from the edge portion from a region on the center side of the edge portion and has a bulging portion that is shaved in the planing.

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