JP2015207679A - Resin mold type capacitor and method of manufacturing the same, and molding form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve increase in efficiency of a burr removal work, and burr removal finishing with good appearance, with respect to removal of burrs appeared on a molded article after release in manufacturing of a resin mold type capacitor.SOLUTION: A molding form 20 used for molding a resin mold type capacitor 10 is obtained by assembling a plurality of form configuration plates 21, 22, 23, and 24 configured by being divided at parting lines PL1, PL2, and PL3 provided at positions apart from corresponding positions of ridgeline parts 10a-10h of a molded article obtained in the form. A capacitor unit 11 is accommodated in a cavity of the assembly type molding form 20, and a molten resin is injected and filled in the cavity, and after solidification of the injected resin, the molded article is molded. Next, the molding form is released to take out the molded article obtained in the cavity. Next, in a planar region on a surface of the molded article that is taken out, burrs 40 appeared at positions corresponding to the parting lines at positions apart from the ridgeline parts 10a-10h, of the molded article are removed.

Description

  The present invention relates to a method for manufacturing a caseless resin molded capacitor in which a capacitor unit is covered with an exterior resin. The present invention also relates to a molding mold used for manufacturing a resin mold capacitor and a resin mold capacitor which is a molded product.

  FIG. 9 is a perspective view showing a conventional resin mold type capacitor 50. FIG. 10 is a perspective view showing an assembling mold frame (die) 60 for molding the resin mold capacitor 50. FIG. FIG. 3 is a perspective view showing a state in which the forming mold 60 is divided into five component forming plates 61, 62, 63, 64, 65. A resin mold type capacitor 50 shown in FIG. 9 has an outer shell made of an exterior resin 52, and a capacitor unit 51 is embedded in the exterior resin 52. That is, the capacitor unit 51 is covered and protected by an exterior resin 52 made of a thermosetting resin such as an epoxy resin.

  The capacitor unit 51 is set in a molding mold 60 used when performing mold molding, the mold is clamped, and a molten resin is injected and filled into the cavity of the molding mold 60. After the filling resin is cured, the mold release is performed. To obtain the resin mold type capacitor 50. Immediately after the resin-molded capacitor 50 is released from the mold 60, burrs 70 are generated at the eight ridges 50a to 50h of the resin-molded capacitor 50 as shown in FIG. The burr 70 is highlighted with an intermittent x symbol. The burr 70 appears in approximately eight ridge line portions 50a to 50h. The four corners of the resin-molded capacitor 50 are ridges 50a, 50b, 50c, 50d along the vertical direction, two parallel long ridges 50e, 50f on the bottom, and parallel on the bottom. Two short ridges 50g and 50h.

  Such burrs 70 appearing on the eight ridge portions 50a to 50h must be removed immediately after release. If the burr 70 is left as it is, the burr 70 may be inadvertently detached and become a source of contamination or cause injury, and installation stability when placed on a flat surface such as a floor, table, or frame. Because it gets worse. The deburring operation is mainly performed manually. As the deburring tool, a rotary, endless belt type or vibration type deburring tool 80 is used.

  There are Patent Documents 1 to 3 as prior art documents that refer to parting lines and burrs, but these points are different from the following problems related to the present invention.

2013-248754 gazette 2001-88713 2001-118356 gazette

  In the conventional resin mold type capacitor 50 described above, the burr 70 is removed by using a burr removing tool 80 such as an electric sander as an abrasive tool to remove the burr of the resin molded body. Specifically, the deburring tool 80 is held by hand, the deburring action surface 81 such as a sanding disk is applied to the ridgeline, and the hand holding the deburring tool 80 is moved along the ridgeline while cutting. The burr 70 on the ridge line portion is continuously removed.

  One of the causes that the burr 70 is generated at the ridge line portion of the resin mold type capacitor 50 that is a molded product is that the molding mold 60 is configured by assembling five flat plate-shaped mold constituting plates 61 to 65. is there. That is, as shown in FIGS. 10 and 11, five plate-shaped formwork constituting plates 61 to 65 are assembled in an edge-butted state. Specifically, the lower end edges of the mold forming plates 61 and 62 forming the wide front side and the rear side are brought into contact with the front and rear end edges of the upper surface of the mold forming plate 65 forming the bottom surface. Further, lower end edges of the mold forming plates 63 and 64 forming the narrow left and right side surfaces are brought into contact with the left and right end edges of the upper surface of the mold forming plate 65 forming the bottom surface. In addition, the front and rear end edges of the left mold form constituting plate 63 are brought into contact with the left end edges of the front form and rear side form form constituting plates 61 and 62, and the front form and rear form form structures are further brought into contact. The front and rear end edges of the right formwork constituting plate 64 are brought into contact with the right end edges of the plates 61 and 62.

  The left and right mold forming plates 63 and 64 are stepped on both upper and lower sides for the following reason. That is, in actual use, a fastening member (bolt) is used when the resin mold type capacitor 50 is attached and fixed to a fixing part such as a frame of an electric vehicle or industrial electric equipment. In order to screw the fastening member, a cylindrical fastener (nut) 55 for fixing and mounting is inserted into the exterior resin 52 with the end exposed. The reason why the upper and lower side portions of the left and right mold forming plates 63 and 64 are stepped is to secure the insert region of the fastened tool 55. The left and right ends of the front and rear mold forming plates 61 and 62 are also stepped in accordance with the step shape of the left and right mold forming plates 63 and 64. As described above, the mold forming plate has a stepped portion. However, in the following discussion, the presence or absence of the stepped portion is not substantially a problem, and there is no problem even if it is handled as a flat plate forming plate having no step. There is no.

  The front and rear mold forming plates 61 and 62 are abutted at a right angle to the bottom mold forming plate 65, and the left and right mold forming plates 63 and 64 are also a right angle against the bottom mold forming plate 65. Further, the left and right mold forming plates 63 and 64 are abutted with the bottom form forming plate 65 at a right angle. In this way, since the end edges of the five mold forming plates 61 to 65 are abutted at right angles, the parting line PL is the eight ridge lines of the resin mold type capacitor 50 which is a resin molded product. It will appear in the parts 50a, 50c, 50b, 50d, 50e, 50f, 50g and 50h. The total number of parting lines PL is eight. Due to the above, burrs 70 appear on these eight ridge line portions 50a to 50h.

  In the above prior art, when the burr removal tool 80 is moved along the ridge line portion of the capacitor 50 in order to remove the burr 70, the burr removal action surface 81 and the ridge line part are in a line contact state, and the burr removal action surface. Since there is nothing that stably supports 81, the posture of the deburring tool 80 is not stable, and the deburring tool 80 fluctuates together with the hand holding the deburring tool 80, so that the work stability of deburring is poor. It was. Therefore, the property of removing burrs tends to be poor, and much effort and time are required for a beautiful finish. In addition, due to poor work stability, the deburring surface 81 may accidentally come into contact with the surface of the resin mold capacitor 50, which would damage the capacitor surface and deteriorate the appearance. Become.

  The present invention was created in view of such circumstances, and in the production of a resin mold type capacitor, with regard to the removal of burrs appearing in a molded product after mold release, the efficiency of the burring removal work and the appearance of beautiful burrs are removed. The goal is to achieve a finish.

  The present invention solves the above problems by taking the following measures.

[Production method of resin mold type capacitor]
A method for producing a resin mold type capacitor according to the present invention includes
As a mold for molding a resin mold type capacitor that is a molded product, a plurality of mold configuration plates divided and configured with a parting line at a position away from the position corresponding to the ridge line portion of the molded product obtained in the mold As an assembly-type molding form that assembles
[1] A capacitor unit is accommodated in the cavity of the assembly-type molding mold, the molten resin is injected and filled in the cavity, and the molded resin is molded by solidifying the injected resin.
[2] Next, the mold is removed from the mold and the molded product obtained in the cavity is taken out,
[3] Next, in the planar area of the surface of the molded product taken out, burrs appearing at the parting line corresponding position at a position away from the ridge line portion of the molded product are removed.

[Assembly-type molding form for resin-molded capacitors]
Further, the assembly type mold form for the resin mold type capacitor according to the present invention is composed of a plurality of divided formwork constituting plates, and the resin is formed as a molded product in a state where the plurality of formwork constituting plates are assembled. An assembly-type molding mold filled with a resin for molding a mold-type capacitor, wherein the plurality of mold-constituting plates are molded such that a parting line is obtained in a cavity of the molding mold It is characterized in that it is defined at a position in a plane area away from the position corresponding to the ridge line part of the product.

[Resin mold type capacitor]
Moreover, the resin mold type capacitor according to the present invention is connected to the first and second side surfaces facing each other and the first and second side surfaces of the plurality of side surfaces forming the outer peripheral surface of the resin mold type capacitor. In the third side surface, a position of a planar region separated by a predetermined dimension from a ridge line portion on a boundary with the other side surface adjacent to the three side surfaces connected to each other, and an assembly-type molding form at the time of molding It is characterized in that a linear deburring mark appears at a part corresponding to the parting line.

  With regard to the above three categories of invention configurations, first, an assembly-type molding form for a resin mold type capacitor will be described. This molding form is for assembling a plurality of formwork constituting plates. In the present invention, consideration is given to the position of the parting line that appears at the boundary between adjacent formwork constituting plates. That is, in the past, the parting line was determined at a position corresponding to the ridge line portion of the molded product obtained in the cavity of the molding mold, whereas in the present invention, it was separated from the position corresponding to the ridge line portion of the molded product. The position is fixed. In other words, this means that the appearance location of burrs, which are small protrusions as unnecessary foreign matters in the molded product, is specified not at the ridge line portion of the molded product but at the position of the planar region away from the ridge line portion.

  Next, a method for manufacturing a resin mold type capacitor using such an assembly-type molding mold will be described. In the first stage, the capacitor unit is accommodated in the cavity of the molding mold, and the molten resin is injected and filled in the cavity of the molding mold in the same manner as in the general manufacturing method of the resin mold type capacitor. Mold a molded product. In the second stage, the molding form is released and the molded product obtained in the cavity is taken out. And as a 3rd step, the burr | flash which has appeared in the part corresponding to the parting line in the position away from the ridgeline part of the molded product in the surface of the taken-out molded product is removed. This is an important point. Conventionally, burrs have appeared at the ridge line portion of the molded product, whereas in the present invention, the burrs are devised so as to appear at the part corresponding to the parting line at a position away from the ridge line portion of the molded product. This is because the molding mold that is divided by the special parting line as described above is used as the assembly-type molding mold. Unlike the conventional example in which burrs appear in the ridge line portion of the resin mold type capacitor, in the present invention, burrs appear in the planar region of the resin mold type capacitor.

  Setting the appearance point of the burr at the position of the planar area away from the ridge line part of the resin mold type capacitor brings about the following action. That is, burrs are removed using a deburring tool such as an electric sander. Since the removal work is a planar area of the resin mold type capacitor, the deburring working surface of the deburring tool is set in the planar area ( The burrs appear in this plane area) and are moved in a state of being applied. In this way, by setting the burr removal working surface along the plane region, it is possible to stabilize the posture of the moving burr removal tool. This is because, unlike the ridge line portion, the planar area has a certain spread (planar spread) (the ridge line portion extends substantially linearly and does not have a planar spread). The burr removal tool cannot be stably supported because the contact mode is in a line contact state). In this way, the burr removal working surface can be supported by the plane area where burrs exist, that is, the plane area can be used as a guide surface for the movement of the burr removal tool. The work stability of removal is improved. The capacitor surface is not damaged by unexpected contact caused by the wobbling of the deburring tool. Therefore, the deburring properties are also good, and a deburring finish with a beautiful appearance can be realized efficiently.

  The resin mold type capacitor molded as described above has a linear deburring trace appearing at the parting line corresponding part of the molding mold for assembly at the time of molding in the flat area forming the outer peripheral surface. It becomes. That is, among the plurality of side surfaces forming the outer peripheral surface, the first and second side surfaces facing each other and the third side surface continuing to the first and second side surfaces are adjacent to these three planes. A linear deburring trace appears at a position separated from the ridge line portion on the boundary with the other side surface.

  In addition, it does not ask | require whether the aspect of a linear burr removal trace is visually revealed here. Even if there is a trace of linear deburring, it is possible to hide it by painting, etc., but it will become apparent if the paint is removed. Including such an aspect, all are included if they can be recognized as a linear deburring trace by any method.

  According to the present invention, the appearance of burrs appearing on the outer surface of a resin molded capacitor that is a molded product corresponding to the parting line of the assembly-type molding formwork is located at a position away from the position corresponding to the ridge line portion of the capacitor. Since it is set as a plane area, compared to the case where burrs appear in the conventional ridgeline part, the plane area that is a burr existing area can be used as a guide surface for the burr removal working surface of the burr removal tool, It is possible to improve the efficiency of deburring work and achieve a beautiful deburring finish.

The perspective view which shows the external appearance of the resin mold type capacitor in the Example of this invention The perspective view which shows the assembly type mold form for resin mold type | mold capacitors in the Example of this invention The perspective view which shows the state which decomposed | disassembled the assembly-type molding formwork in the Example of this invention. The perspective view which shows the state which decomposed | disassembled the assembly-type molding formwork in the Example of this invention. The perspective view of the resin mold type capacitor of the state in which the burr | flash immediately after taking out from the molding frame by the manufacturing method of the resin mold type capacitor in the Example of this invention has appeared A perspective view of the resin-molded capacitor with the burrs appearing as in FIG. The perspective view which shows the external appearance after a burr | flash removal with the resin mold type capacitor in the Example of this invention A perspective view of the resin mold type capacitor after removing the burr as seen in FIG. Perspective view showing a conventional resin mold type capacitor The perspective view which shows the assembly type molding form for the resin mold type capacitors of a prior art example The perspective view which shows the state which decomposed | disassembled the assembly-type molding formwork in a prior art example

  Each configuration of the present invention described above has the following preferred modes.

[Production method of resin mold type capacitor]
As the above-mentioned molding form, on the inner side surface, a molding is made by assembling a mold-constituting plate in which a region having a certain spread from the edge with a parting line toward the opposite edge is formed in a concave region A mode of using a formwork. The concave region in the mold forming plate corresponds to the thin convex region of a resin mold type capacitor which is a molded product to be described later.

[Assembly-type molding form for resin-molded capacitors]
A mode in which a region having a certain spread from the end edge where the parting line is located to the opposite end edge is formed in the concave region on the inner surface of the formwork constituting plate.

[Resin mold type capacitor]
An aspect in which a region having a certain spread from the part corresponding to the parting line toward both sides thereof is formed in a thin convex region, and a linear burr removal mark is formed along substantially the center of the thin convex region.

  These aspects eventually form a thin convex region in the planar region of the resin mold capacitor that is a molded product so that the part corresponding to the parting line is substantially along the center of the thin convex region. This is a configuration in which linear burrs appear along the center. The upper surface of the thin convex region is a planar region, and a parting line corresponding position is located in the planar region. Removal of linear burrs in thin convex areas (planar areas) means that the deburring operation is performed by applying a deburring surface to the thin convex areas (planar areas). The surface area of the burrs is less likely to come into contact with the deburring surface of the deburring tool, and there is an effect that the flat areas other than the thin-walled convex areas are not damaged. After the linear burrs are removed, the surface of the thin convex region becomes almost flat. This substantially flat thin convex region exhibits a band-like design in the appearance of the resin mold type capacitor. In particular, the substantially flat thin convex region appearing on the bottom surface of the resin mold type capacitor serves as a stable installation leg for the installation surface of the resin mold type capacitor.

  Moreover, it is preferable to use the following four-part molding molds as the molding molds. That is, the resin filling space of the assembled molding form is substantially a rectangular parallelepiped shape, and the molding form has a wide front side part / rear side part including a bottom part and a narrow left side part / right side part. And the molding form, at the vicinity of the inner peripheral surface of the molding form that is separated from the left side by a predetermined distance in the right direction, A first parting line extending from the front side surface through the bottom surface to the rear side surface, and a second parting extending from the front side surface through the bottom surface to the rear side surface at a predetermined distance leftward from the right side surface A form divided into four formwork configuration plates by a line and a third parting line extending in the left-right direction so that the bottom surface is divided into two in the front-rear direction and the first and second parting lines are connected And First of all, the molding mold is placed on the left side, the center, and the right side with two parting lines (first and second parting lines) that are continuous in a “U” shape that opens upward. Divide into three. The left and right side formwork component plates are narrow and the central formwork part is wide. The center wide mold part is divided into two in the front-rear direction at the bottom by a parting line (third parting line) extending in the left-right direction so as to connect the first and second parting lines. doing.

  The molding form made up of a three-part plus two-part form plate forming plate as a whole has the advantage that it is easier to release the molded product than a simple two-part form. In addition, the linear burr removal mark is “H” -shaped on the bottom surface, and the thin convex region is line-symmetric and develops in a wide area region, so that the installation stability is excellent.

  In addition, as a preferable embodiment described above, the position of the burr that appears at the parting line-corresponding location is set to a position that is substantially along the center of the thin convex region that is further formed in the planar region of the resin mold capacitor. In the invention, the invention is not limited to this, and there is no formation of a thin convex region, and the side surface of the resin-molded capacitor is an entirely flat planar region, and a burr appears directly in the planar region. It may be. In this case, it is assumed that the above-described concave region is eliminated in the assembly-type molding mold.

  Hereinafter, embodiments of a resin mold type capacitor, a manufacturing method thereof, and a molding form according to the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an external appearance of a resin molded capacitor 10 which is a finished product. In the resin mold type capacitor 10, the entire capacitor unit 11 is covered with an exterior resin 12 except for the connection terminal portion 14 of the external lead terminal. The internal capacitor unit 11 is constructed by stacking a plurality of capacitor elements 11a in the vertical direction and arranged in parallel, and is connected to metal electrodes (not shown) at both ends in the axial direction of the capacitor elements 11a with positive and negative external lead terminals. (Not shown) are joined by soldering or the like. Each capacitor element 11a is formed by winding or laminating a metallized film (having a metal vapor-deposited electrode on at least one side of a dielectric film) and forming metal electrodes (metal spray electrodes) at both ends in the axial direction. It is. The exterior resin 12 prevents external moisture from entering the capacitor unit 11 and degrading the characteristics of the capacitor. Reference numeral 15 denotes a cylindrical fastener (nut) inserted into the exterior resin 12 in an exposed state, and a fastening member (bolt) is screwed into the fastener to fix the resin mold type capacitor 10 to a frame or the like. It is designed to be fixed on the part.

  FIG. 2 is a perspective view showing an assembling mold 20 and FIGS. 3 and 4 are perspective views showing a state in which the mold 20 is disassembled. The molding mold 20 is composed of four divided mold forming plates 21, 22, 23, and 24. In other words, the resin filling space of the assembled molding form 20 has a substantially rectangular parallelepiped shape, and the wide front side mold form constituting plate 21 including the bottom surface constituting part and the wide rear side including the bottom constituting part. It is composed of a side wall mold forming plate 22, a narrow left side mold forming plate 23 and a narrow right side mold forming plate 24. The mold forming plates 21 and 22 on the front and rear side portions and the mold forming plate 23 on the left side are small from the positions corresponding to the ridges 10a and 10c along the vertical direction on the left side of the resin mold capacitor 10. It is divided along the first parting line PL1 set at a position separated by the dimension. The mold forming plates 21 and 22 on the front and rear side portions and the mold forming plate 24 on the right side are small from the positions corresponding to the ridges 10b and 10d along the vertical direction on the right side of the resin mold type capacitor 10. It is divided along a second parting line PL2 set at a position separated by a dimension. The first and second parting lines PL1 and PL2 are a series of lines extending from the front side surface to the rear side surface through the bottom surface, and the shape thereof is a “U” shape oriented upward. Also, the mold forming plate 21 on the front side and the mold forming plate 22 on the rear side are formed by connecting the first parting line PL1 and the second parting line PL2 at the bottom of the resin mold type capacitor 10, respectively. The central part in the front-rear direction is divided along a third parting line PL3 extending in the left-right direction so as to be connected.

  As described above, the assembly-type molding mold 20 is divided into four mold forming plates 21, 22, 23, and 24 with the first, second, and third parting lines PL1, PL2, and PL3. These four formwork constituting plates 21, 22, 23, and 24 are assembled in an edge-butted state.

  Each of the four mold forming plates 21, 22, 23, 24 has a certain spread on the inner surface from the edge where the parting line (PL 1, PL 2, PL 3) is located to the opposite edge. A region is formed in the recessed region 30. These recessed regions 30 are formed by press molding of metal plates that form the mold forming plates 21, 22, 23, 24.

  In the form part constituting plates 21 and 22 on the front side surface portion and the rear side surface portion, the third parting line PL3 and the second parting line PL2 are respectively formed from the L-shaped portion of the first parting line PL1. A concave region 30 is formed on the inner surface of the plate along a series of lines extending to the L-shaped portion. In the mold forming plate 23 on the left side surface portion, a concave region 30 is formed on the inner surface of the plate along a series of lines extending over the entire U-shaped range of the first parting line PL1. Further, in the mold forming plate 24 on the right side surface portion, a concave region 30 is formed on the inner surface of the plate along a series of lines extending over the entire U-shaped range of the second parting line PL2.

  The four formwork constituting plates 21, 22, 23, 24 having the concave region 30 formed on the inner surface along the parting lines PL1, PL2, PL3 as described above were assembled in a state in which the adjacent ones were butted against each other. Using the mold 20 for molding (see FIG. 2), the capacitor unit 11 is accommodated in a cavity which is an internal space thereof, and a molten thermosetting resin such as an epoxy resin is injected and filled in the cavity. After solidifying, the molded product of the resin mold type capacitor 10 is molded. Next, the molding mold 20 is disassembled into four mold-constituting plates 21, 22, 23, and 24 to release the resin mold capacitor 10, and the resin mold capacitor 10 obtained in the cavity is taken out. .

  FIG. 5 is a perspective view of the resin mold type capacitor in a state in which burrs appear just after being taken out from the mold for molding by the resin mold type capacitor manufacturing method in the embodiment of the present invention, and FIG. It is the perspective view which turned over and looked at the resin mold type capacitor of.

  In the resin mold type capacitor 10 taken out, as shown in FIGS. 5 and 6, burrs (small protrusions which are unnecessary foreign matters) are formed at locations corresponding to the parting lines PL 1, PL 2 and PL 3 of the molding mold 20. 40 has occurred. That is, the thin convex region 16a connected in a U-shape to the corresponding part of the first parting line PL1 parallel to the left vertical ridge lines 10a, 10c is formed on the outer surface (front side surface and bottom surface of the resin mold type capacitor 10). The burrs 40 are formed along the center line in the width direction of the thin convex region 16a that is formed in the U-shape. Further, the thin convex region 16b connected in a U-shape to the corresponding part of the second parting line PL2 parallel to the right vertical ridges 10b and 10d is formed on the outer surface (front side surface and bottom surface of the resin mold type capacitor 10). The burr 40 is also formed along the center line in the width direction of the thin convex region 16b continuous in a U-shape. Further, a linear thin convex region 16c is formed on the bottom surface of the resin mold type capacitor 10 at the corresponding portion of the third parting line PL3 along the left and right ridges 10e and 10f on the bottom surface. The burr 40 is also generated along the center line in the width direction of the thin convex region 16c.

  Therefore, in the next step, the burrs 40 generated along the center line of the thin convex region 16 (16a, 16b, 16c) are removed. On the front side surface of the resin mold type capacitor 10, burrs 40 are generated in the thin convex region 16a near the left edge, and burrs 40 are also generated in the thin convex region 16b near the right edge. The upper surfaces of the thin convex regions 16a and 16b on the left and right sides of the front side surface are flat regions, and burrs 40 are generated in a protruding state in the flat regions.

  The burrs 40 generated in the planar region that is the upper surface of the thin convex region 16 (16a, 16b, 16c) can be easily and beautifully removed by an endless polishing belt (not shown) as a deburring tool. If an endless polishing belt is used, it is possible to remove the burrs 40 on the thin convex regions 16a and 16b that are divided into left and right in one operation. The burr 40 extending in parallel on the left and right thin convex regions 16a and 16b on the front side surface and the burr 40 extending in parallel on the left and right thin convex regions 16a and 16b on the rear side surface of the resin mold capacitor 10 are both Both can be removed in one operation. On the bottom surface of the resin mold type capacitor 10, the burr 40 that develops in an “H” shape on the left and right thin convex regions 16a and 16b and the central thin convex region 16c that connects the two can be removed in one operation. In total, all burrs 40 can be efficiently removed by three operations. Compared with the conventional example requiring 8 operations, the working ability can be greatly improved.

  Unlike the ridge line portion 10, the thin convex region 16 (16a, 16b, 16c) where the burr 40 is present in this burr removal operation has a certain spread (surface spread), and therefore an endless polishing belt. The deburring operation can be performed in a state in which the posture is stabilized by applying to the flat region which is the thin convex region. That is, since the flat area which is a thin convex area can be used as a guide surface, the work stability of deburring is good. It does not damage other areas of the capacitor surface. Therefore, the deburring properties are also good, and a deburring finish with a beautiful appearance can be realized efficiently.

  FIG. 7 is a perspective view showing an appearance after removing burrs in the resin mold type capacitor 10 according to the embodiment of the present invention. FIG. 8 is a perspective view of the resin mold type capacitors 10 after removing the burrs. In the thin convex region 16 (16a, 16b, 16c) having a certain spread from the part corresponding to the parting line toward both sides thereof, a linear burr removal trace 41 is formed along substantially the center thereof. The thin convex region 16 (16a, 16b, 16c) including the linear burr removal mark 41 has a flat surface in the entire region.

  For reference, an example of the dimensional relationship of each part is as follows. The width of the resin-molded capacitor 10 is about 120 mm, the width of the thin convex region 16 (16a, 16b, 16c) is about 20 mm, and the thickness is about 0. .5 mm. Although these can be set arbitrarily, the thickness of the thin convex region 16 is limited by the width and height of the capacitor (the larger the thickness of the thin convex region 16, the larger the size, which is preferably as small as possible) and the deburring operation From the viewpoint of properties, it is preferably 0.5 mm or more and 1.0 mm or less.

  In addition, about the division | segmentation method of the formwork for shaping | molding, it may replace with said 4 division | segmentation method and may be a 2 division | segmentation system, a 6 division | segmentation system, etc. In the case of a small capacitor, a two-division method may be used, and for a large capacitor, a six-division method is preferable. When dividing into two parts, a parting with one parting line corresponding to the first parting line PL1 (or the second parting line PL2) at the center position in the width direction (left-right direction) of the capacitor, There is one that divides by one parting line corresponding to the third parting line PL3 at the center position in the depth direction (front-rear direction) of the capacitor C. When dividing into six parts, in the above-described embodiment, there is one in which the part is further divided with a parting line passing through the center position in the width direction (left-right direction) of the capacitor.

  INDUSTRIAL APPLICABILITY The present invention is useful as a technique for realizing the work efficiency improvement and the beautiful appearance of the removal of burrs appearing on the outer surface of the resin mold type capacitor corresponding to the parting line of the assembly-type molding mold. is there. In particular, it is effective for resin mold type capacitors for industrial machines and vehicles.

DESCRIPTION OF SYMBOLS 10 Resin mold type | mold capacitor 10a-10f Ridge line part 11 Capacitor unit 12 Exterior resin 16a, 16b, 16c Thin-wall convex area | region 20 Molding mold 21, 22, 23, 24 Mold frame structure plate 30 Concave area 40 Burr 41 Linear burr removal Trace PL1, PL2, PL3 Parting line

Claims (7)

As a mold for molding a resin mold type capacitor that is a molded product, a plurality of mold configuration plates divided and configured with a parting line at a position away from the position corresponding to the ridge line portion of the molded product obtained in the mold As an assembly-type molding form that assembles
The capacitor unit is accommodated in the cavity of the assembly-type molding mold, the molten resin is injected and filled into the cavity, the molded resin is molded by solidifying the injected resin,
Next, the mold is removed from the mold and the molded product obtained in the cavity is taken out,
Next, in the planar region of the surface of the molded product taken out, a burr that appears at a parting line corresponding position away from the ridge line portion of the molded product is removed. .   As the mold for molding, molding is performed by assembling a mold forming plate in which an area having a certain spread from the edge where the parting line is located toward the opposite edge is formed in a concave area on the inner surface thereof The manufacturing method of the resin mold type capacitor | condenser of Claim 1 which uses a formwork.   Assembling-type molding form which is composed of a plurality of divided formwork constituting plates and is filled with a resin for forming a resin mold type capacitor as a molded product in a state where the plurality of formwork constituting plates are assembled. In this case, the plurality of mold forming plates are defined at positions in a plane region away from the position corresponding to the ridge line part of the molded product obtained in the cavity of the molding mold. Assembling type mold for resin mold type capacitors.   The assembly according to claim 3, wherein an area having a certain spread from an edge where the parting line is located to an opposite edge is formed in a concave area on the inner side surface of the mold forming plate. Forming mold.   The resin filling space of the assembled molding form is substantially a rectangular parallelepiped shape, and the molding form has four mold configurations of a wide front side portion / rear side portion and a narrow left side portion / right side portion. It is assumed that the molding mold is formed of a plate, and the molding mold passes through the bottom surface from the front side surface of the inner circumferential surface of the molding mold at a position near the left side surface by a predetermined distance in the right direction. A first parting line that reaches the rear side, and a second parting line that extends from the front side through the bottom to the rear side at a position near the right side by a predetermined distance in the left direction; The bottom surface is divided into two parts in the front-rear direction, and is divided into four mold forming plates by a third parting line extending in the left-right direction so as to connect the first and second parting lines. Claim 3 or Prefabricated mold frame according to Motomeko 4.   Of the plurality of side surfaces forming the outer peripheral surface of the resin-molded capacitor, the first and second side surfaces facing each other and the third side surface continuing to the first and second side surfaces are the three consecutive side surfaces. Is a position of a flat area that is separated from the ridgeline on the boundary with the other side surface adjacent to the surface, and removes the linear burr at the parting line corresponding part of the mold for assembly at the time of molding. A resin mold type capacitor characterized by marks.   7. A region having a certain spread from the part corresponding to the parting line toward both sides thereof is formed as a thin convex region, and the linear deburring trace is formed along substantially the center of the thin convex region. The resin mold type capacitor described in 1.

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