JP2010103284A - Hollow part forming method of substrate, and substrate with hollow part for inserting component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a hollow part for inserting a component on a substrate which does not interfere with insertion of the component having corners in a simple method. <P>SOLUTION: A substrate 20 with a hollow part 22 which is a hole in which a component 10 having corners 12 is inserted includes: a circular part 24 which is a circular hole to assure a predetermined gap set in advance as an interval between the component 10 and the corner 12, and is provided to expand from the corner of the hollow part 22; and a contour part 26 which is formed by moving, while rotating, a rotary tool along a tool moving trajectory for assuring a predetermined interval by considering radius of the rotary tool, for forming a profile other than the circular part 24 at the corner. The circular part 24 is machined with a drill or end mill, and the contour part 26 is machined using a router or end mill as a rotary tool. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for forming an inner shape portion in a substrate and a substrate having an inner shape portion for component insertion, and more particularly, to an inner shape portion that is a recess or a hole for inserting a component having a corner portion into a substrate. The present invention relates to a shape forming method, a substrate including a component insertion inner shape portion, and a substrate including a component insertion inner shape portion having a corner portion.

  A drill is used to make a round hole in the board, but in order to make a hole with a complex contour such as a polygon instead of a round hole, a rotary tool with a cutting edge on the outer peripheral side of a router or end mill is rotated. While moving along the contour line, the substrate is shaved. Such a rotary tool with an outer blade has a circular cross-sectional shape corresponding to the radius of rotation, so if there is a corner (corner) like a polygon, that part is the same as that of the rotary tool with an outer blade. It becomes the R part corresponding to the radius, and it cannot be a clean corner part.

  For example, in Patent Document 1, as a method of machining a square hole in a numerically controlled machine tool, an end mill is attached to a spindle, a work is fixed on a table so that the end mill is perpendicular to the bottom surface of the square hole, and the end mill is installed. It has been pointed out that when each surface of a square hole is processed in three orthogonal directions, an R portion corresponding to the radius of the end mill remains at the corners of the two orthogonal surfaces of the square hole.

  And, in order to remove this R part, the method of reworking the corner part using a smaller diameter end mill in the next process is conventionally used, but the small diameter end mill is easy to break and cannot be subjected to a large load. It is said that time is increased, and when a workpiece is transferred to a die-sinking electric discharge machine and processed separately, a dedicated processing machine is separately required.

  Therefore, here, an end mill with a conical tip is attached to the main shaft, a work with a square hole recessed is attached to the table, and the work is placed so that the side surface of the square hole is parallel to the conical surface of the end mill tip. Rotating and positioning around any two of the three axes, moving the end mill along the boundary line between two orthogonal faces of the square hole, and processing the corner of the square hole by the conical part at the end of the end mill It is disclosed.

JP-A-9-117845

  When the part corresponding to the corner of the hole becomes the R part when the part insertion hole is made in the board, when trying to insert the part having the corner in the hole, the part of the hole and the corner of the part are inserted. Interfere with each other. If the component is forcibly pushed in, the R portion of the substrate is damaged, substrate residue is generated, and the design of the substrate is impaired. In some cases, it may be difficult to insert a component. Although it is conceivable to make a large part insertion hole so that the R part of the hole in the board and the corner part of the part do not interfere with each other, in that case, the hole in the board and the part other than the corner part of the part A gap between the outer shape and the outer shape becomes unnecessarily large. For example, foreign matter may be mixed into the gap, and design properties are also deteriorated.

  As described in Patent Document 1, the method of additionally machining the R portion with a small-diameter drill easily breaks the drill and takes time for the additional machining. A method for performing post-processing such as electric discharge machining requires a special dedicated processing machine. Further, the method disclosed in Patent Document 1 requires complicated work holding and requires a special tool. Thus, in the prior art, it is not easy to process the corners.

  An object of the present invention is to provide a method for forming an inner shape portion on a substrate, which enables processing related to corner portions by a simpler method. Another object is to provide a substrate with a component insertion inner shape that does not interfere when inserting components having corners in a simpler manner.

  An inner shape forming method for a substrate according to the present invention is a method for forming an inner shape that is a recess or a hole for inserting a component having a corner into a substrate, and projects at the corner of the inner shape. In addition, a predetermined circular gap is formed in consideration of the radius of the rotary tool, and a corner circular processing step in which a circular hollow or circular hole is formed in advance, which can ensure a predetermined gap as a gap between the corners of the component A tool moving machining step of forming a contour portion which is a contour other than the circular portion of the corner portion by rotating the rotary tool along a tool movement trajectory that can be secured.

  Further, in the inner shape forming method in the substrate according to the present invention, the corner circular processing step forms a circular portion by a drill or an end mill, and the tool moving processing step follows the tool movement trajectory while rotating the router or the end mill. It is preferable to form a contour portion which is a contour other than the circular portion of the corner portion by moving them.

  Further, the board having the inner shape part for component insertion according to the present invention is a board having an inner shape part that is a recess or a hole for inserting a component having a corner part, and is projected at the corner part of the inner shape part. A circular portion that is a circular recess or a circular hole that can secure a predetermined clearance set in advance as a clearance between the corners of the component, and a tool movement trajectory that can secure a predetermined clearance in consideration of the radius of the rotating tool. And a contour portion that is formed by moving the rotary tool while rotating, and forms a contour other than the circular portion of the corner portion.

  According to at least one of the above-described configurations, the inner shape portion forming method in the substrate projects from the corner portion of the inner shape portion so as to secure a predetermined gap set in advance as a gap between the corner portions of the component. The circular part is formed in advance, and then the rotary tool is rotated while being rotated along a tool movement trajectory that can secure a predetermined gap in consideration of the radius of the rotary tool, and the contour is other than the circular part of the corner part. A contour is formed.

  In this way, a circular portion that has a shape protruding from the contour line to be processed next is processed in advance at the corner portion of the inner shape portion into which the component is inserted. Due to the presence of this circular portion, the circular portion of the inner shape portion does not interfere with the corner portion of the component even when a component having a corner portion is inserted into the inner shape portion. Since the processing of the circular portion is general machining, the processing related to the corner portion can be performed by a simple method.

  Further, in the inner shape forming method on the substrate, the circular circular step is formed by a drill or an end mill, and the tool moving processing step is moved along the tool movement locus while rotating the router or the end mill. The contour portion which is the contour other than the circular portion of the corner portion is formed. In this way, the inner shape portion can be processed including the processing related to the corner portion only by using a general machining tool.

  Further, the substrate including the internal shape portion for inserting the component is a circular recess or a circular hole provided so as to protrude from the corner portion of the internal shape portion and ensure a predetermined gap set in advance as a gap between the corner portions of the component. A circular portion and a contour portion that is formed by rotating the rotary tool along a tool movement trajectory that can secure a predetermined gap in consideration of the radius of the rotary tool, and that forms a contour other than the circular portion of the corner portion. . Due to the presence of this circular portion, the circular portion of the inner shape portion does not interfere with the corner portion of the component even when a component having a corner portion is inserted into the inner shape portion. Since the processing of the circular portion is general machining, a substrate having an internal shape portion for component insertion that has been processed with respect to the corner portion by a simple method can be obtained.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The materials, shapes, dimensions, the number of divisions at the tip, and the like described below are examples, and these contents can be changed as appropriate according to the purpose of use.

  In the following, a case where a square hole is formed in a substrate into which a rectangular component is inserted will be described. However, the hole may be a through hole or a bottomed hole, that is, a counterbore-formed recess. . As a concept including both a through hole and a bottomed hole, an inner shape portion will be described. Here, a substrate having a rectangular inner shape portion will be described below. The shape does not have to be a quadrangle, and may be a shape having a portion corresponding to the corner corresponding to the component having the corner. For example, a polygonal shape may be used, and the shape may be round as a whole, but there may be a portion corresponding to a corner at one or more locations. In these cases, the corner circular processing is performed on the portion corresponding to the corner, that is, the portion corresponding to the portion where the corner of the inserted component hits.

  Hereinafter, a resin substrate will be described as a substrate, but the material may be other than resin. For example, a laminated substrate having the same structure as that used for a ceramic substrate, a metal substrate, a wooden substrate, a circuit substrate, or the like may be used.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a diagram for explaining a state of a substrate 20 including an inner shape part for component insertion. In the following description, unless otherwise specified, the substrate 20 including the component insertion inner shape portion is simply referred to as the substrate 20. In FIG. 1, although not a component of the substrate 20, the outline of the component 10 to be inserted is indicated by a broken line. The component 10 has a quadrangular outline with four corners 12. This rectangular outer contour is inserted into the inner shape portion 22 provided on the substrate 20 and held by an appropriate holding means.

  The substrate 20 has a rectangular parallelepiped outer shape made of a resin, and an inner shape portion 22 provided on the inner side thereof includes a partial circular portion 24 corresponding to each of the four corner portions 12 of the component 10 and four partial portions. And a contour portion 26 that is a straight portion connecting the circular portions 24.

  The partial circular portion 24 is provided at the corner portion of the inner shape portion 22 so as to protrude from the virtual contour portion that connects the straight portions of the contour portion 26, and serves as a gap between the corner portion 12 of the component 10. It is a circular hole that can ensure a predetermined gap set in advance. Here, what is described as a circular hole is actually a hole having a partial circular contour, as shown in FIG. 1, but as described later, a partial circular shape is This is because, when the contour portion 26 is formed, what was originally a circular contour has been removed, and is originally a circular hole. Therefore, hereinafter, this partial circular portion 24 will be simply referred to as a circular portion 24.

  The contour part 26 is formed by rotating the rotary tool along a tool movement trajectory that can secure a predetermined gap in consideration of the radius of the rotary tool, and forms a contour other than the circular part of the corner part. In the example, it is a straight portion connecting the four circular portions 24.

  FIG. 2 is a flowchart showing the manufacturing procedure of the substrate 20, and FIGS. 3 to 6 are diagrams for explaining the contents of the procedure. Here, the target component to be inserted into the board 20 is determined first (S10). The determination of the target component is determination of the outer shape of the component, specifically, the outer shape to be inserted into the board 20, and does not have to be detailed determination of the component itself. When the outer shape of the target part is determined, a substrate material having a size corresponding to the outer shape is prepared (S12).

  This is shown in FIG. Here, a quadrilateral having four corners 12 is shown as the outer shape of the target component 10. Examples of the component 10 having such a quadrangular outer shape having four corners are a connector and a switch box. Then, a material substrate 30 having an outer shape slightly larger than the rectangular outer shape of the component is prepared. Here, what is described as an outer shape is a shape in a plan view. The plan view is a view when the surface to be processed of the material substrate 30 is placed on a plane. Therefore, the thickness direction of the material substrate 30 is a direction perpendicular to the paper surface in FIG.

  Returning to FIG. 2 again, the corner circular processing is performed (S14). The corner circular machining is performed by using a drill or an end mill so that a predetermined gap preset as a gap between each corner 12 can be secured at a location corresponding to the four corners 12 of the component 10. It is the process which forms previously the circular part which is. Here, the pre-formed processing means that prior to the next tool movement processing step. The circular hole is formed by using a drill or an end mill and rotating it in the axial direction while rotating it. Unlike the next tool movement machining process, in this corner circular machining process, the rotary tool is moved in the axial direction, but is not moved on the plan view. In short, this corner circular processing is a simple circular through hole processing.

  This is shown in FIG. Here, an intermediate process substrate 32 in which a total of four circular holes 34 are processed at each of the locations corresponding to the four corners 12 of the component 10 is shown. Since the circular hole 34 is determined so that the circular outline can secure a predetermined gap set in advance as a gap between each corner portion 12 as described above, the circular hole 34 is determined from the outline outline of the component 10. Overhangs the shape.

  Returning to FIG. 2 again, next, tool movement processing is performed (S16). The tool moving process is a process of forming a contour portion that is a contour other than the circular portion of the corner portion by moving the router or the end mill along the tool moving locus while rotating. The router is a rotary tool having a processing blade such as a file blade on the outer peripheral portion, and is also called a router, a router, or a router. The tool movement trajectory is set on the plan view so as to be shifted inward from the outline of the component 10 by the total value of the radius dimension of the rotary tool and the predetermined gap dimension. By setting in this way, when the rotary tool is moved along the tool movement trajectory on the plan view, the contour part which is the contour formed by sequentially cutting the intermediate process substrate by the outer cutter of the rotary tool. However, it is provided at a position away from the outer shape of the component 10 by a predetermined gap.

  This is shown in FIG. Here, while the router 14 as a rotating tool rotates while partially cutting the four circular holes 34, the center of the rotating shaft moves along the tool movement locus 16, and the processed substrate 36 in which the contour portion 38 is formed is obtained. It is shown. A portion where the router 14 cuts four circular holes 34 is indicated by a broken line at the circular hole 34. That is, if there is no circular hole 34, the router 14 processes the corners of the quadrangle so as to form an arc as shown by the broken line. In the arc-shaped processing of the broken line, there is a possibility that the corner 12 of the component 10 interferes.

  In FIG. 4, it has been described that the circular hole 34 protrudes from the outer contour of the component 10. However, as shown in FIG. 5, the circular hole 34 previously processed in S <b> 14 is formed by the router 14 that is a rotary tool. It also protrudes from the machining line to be cut. That is, the completed inner shape portion 22 is a substantially rectangular through hole having four circular protruding portions. In order to do this, it is preferable that the outer diameter of the drill or end mill used for circular hole machining is approximately the same as the outer diameter of the router or end mill used for tool movement machining. For example, the same outer diameter may be used, and the tool diameter for circular hole machining may be larger than the tool diameter for tool movement machining. Further, the center position of the circular hole in S14 is set to a position outside the tool movement locus. For example, it can be a position on the outer diameter contour line of the component 10.

  FIG. 6 is a view showing the substrate 20 having the inner shape portion 22 completed in this way, and the content is the same as FIG. Since the circular portion 24 shown here protrudes from the outer contour of the component 10 as described above, it does not interfere with the corner portion 12 of the component 10 as described in FIG.

  FIG. 7 is a diagram showing a state of a conventional square hole machining in which only the tool moving machining is performed using the router 14 without performing the corner circular machining. With only the tool movement processing, as described with the broken line in the circular hole 34 in FIG. 5, the shape of the inner shape portion becomes an arc-shaped shape 42 at a position corresponding to the corner portion. When the component 10 having the corner 12 is inserted into the inner shape having the arcuate shape 42 at the four corners, interference occurs. When the component 10 is forcibly inserted, the substrate 40 is damaged, and scraps or the like are generated. This may damage the design of the substrate 40 or the component 10. In the case of the substrate 20 having the inner shape portion 22 having the protruding circular portion 24 described with reference to FIG. 1, such a problem of interference does not occur.

In embodiment which concerns on this invention, it is a figure explaining the mode of a board | substrate provided with the internal shape part for components insertion. 4 is a flowchart showing a substrate manufacturing procedure in the embodiment of the present invention. In embodiment which concerns on this invention, it is a figure explaining the mode of the prepared raw material board | substrate. In embodiment which concerns on this invention, it is a figure explaining the mode of the intermediate | middle process board | substrate by which corner part circular processing was performed. In embodiment which concerns on this invention, it is a figure explaining the mode of the processed board | substrate with which the tool movement process was performed. In embodiment which concerns on this invention, it is a figure which shows the mode of a board | substrate provided with the completed internal shape part for components insertion. It is a figure explaining the mode of the internal shape part process by a prior art.

Explanation of symbols

  10 parts, 12 corners, 14 routers, 16 tool trajectories, 20, 40 substrates, 22 inner shapes, 24 circular portions, 26, 38 contours, 30 material substrates, 32 intermediate process substrates, 34 circular holes, 36 machining Finished board, 42 arc shape.

Claims (3)

A method of forming an inner shape that is a recess or hole for inserting a component having a corner into a substrate,
A corner circular processing step that preliminarily forms a circular portion that is a circular recess or a circular hole that protrudes from the corner of the inner shape portion and can secure a predetermined gap that is set in advance as a gap between the corner of the component;
A tool moving machining step for forming a contour portion that is a contour other than the circular portion of the corner portion by moving the rotating tool along a tool movement trajectory that can secure a predetermined gap in consideration of the radius of the rotating tool;
A method for forming an inner shape part in a substrate, comprising: In the inner shape part formation method in the board | substrate of Claim 1,
In the corner circular machining process, a circular part is formed by a drill or an end mill,
The tool movement processing step forms an outline portion that is an outline other than a circular portion of a corner portion by moving along a tool movement locus while rotating a router or an end mill. . A substrate comprising an inner shape that is a recess or hole for inserting a component having a corner,
A circular portion that is provided so as to project at the corner of the inner shape portion, and is a circular recess or a circular hole that can ensure a predetermined gap that is preset as a gap between the corner of the component;
A contour part that forms a contour other than a circular part of a corner, formed by moving the rotary tool along a tool movement trajectory that can secure a predetermined gap in consideration of the radius of the rotary tool,
A board comprising an inner shape part for component insertion.

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