JP2011122205A - Plating processing device for cylinder block - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plating processing device for a cylinder block which has such an inexpensive structure that the positional precision of seal position is high and the fixation of a cylinder block and the retention of a seal fixture are permitted by a simple operation and can flexibly correspond to miniaturization of an engine. <P>SOLUTION: The plating processing device 1 includes: a loading stand 3 capable of freely loading a cylinder block 101; a cylindrical electrode 6 which forms an annular processing liquid flow path 4 between a cylinder inner circumferential surface 103 and the cylindrical electrode 6; a seal fixture 7 disposed on a free end part of the cylindrical electrode 6; an extension seal member 31 which can be expanded to such an extension state capable of sealing an opening end of the other side of the cylinder inner circumferential surface 103; an air joint 9 which is connected freely attachably and detachably to the seal fixture 7 and actuates the extension seal member 31 into the extension state; an upper fixture 8 for holding the cylinder block 101 between the loading stand 3 and the upper fixture; and a coil spring 33 which performs positional adjustment when connecting the air joint 9 with the seal fixture 7. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a cylinder block plating apparatus for plating a cylinder inner peripheral surface of a cylinder block.

  2. Description of the Related Art A cylinder block plating apparatus that includes an electrode disposed in a cylinder bore and causes a plating process to flow between the electrode and the cylinder to perform plating on the inner peripheral surface of the cylinder is known.

  Such a cylinder block plating apparatus includes a mounting table for mounting a cylinder block with the cylinder head side facing downward, and a cylinder bore inserted into the cylinder bore through the cylinder head side opening of the cylinder bore. A cylindrical electrode that forms an annular processing liquid flow path therebetween, and a sealing jig that closes an end of the cylinder bore on the crankcase side are provided. The cylinder block plating apparatus configured as described above generates a potential difference between the cylinder block and the cylindrical electrode while flowing the plating process liquid from the crankcase side to the cylinder head side in the process liquid flow path. And a plating layer is formed on the inner peripheral surface of the cylinder.

  Here, the cylinder block plating apparatus needs to maintain a liquid-tightness between them so that the plating solution does not leak from the gap between the opening on the crankcase side of the cylinder bore and the sealing jig.

  Therefore, a cylinder block plating apparatus having a sealing jig that can be expanded and reduced in diameter and has a mechanism that can be expanded and folded in an umbrella shape is known (for example, see Patent Document 1).

  Also, there is known a cylinder block plating apparatus provided with a sealing jig that mechanically crushes an O-ring or a disk-shaped rubber plate to expand the diameter (see, for example, Patent Document 2 and Patent Document 3). ).

Japanese Patent Laid-Open No. 10-81995 JP-A-8-92789 Japanese Patent Laid-Open No. 8-261555

  In a conventional cylinder block plating apparatus, a cylinder block is placed on a mounting table, and then a sealing jig that is relatively movable with respect to the mounting table is appropriately disposed to block the cylinder bore. Moreover, the conventional cylinder block plating apparatus operates a mechanism that expands in an umbrella shape or a mechanism that mechanically crushes an O-ring or a disk-shaped rubber plate when expanding the diameter of a sealing jig.

  The conventional cylinder block plating apparatus constructed in this way has low positioning accuracy of the entire sealing jig and reproducibility accuracy of the contact position between the expanded sealing jig and the cylinder inner peripheral surface. There was a problem that the position accuracy of the actual seal position with respect to the target position of the inner peripheral surface could not be obtained.

  In addition, since the conventional cylinder block plating apparatus functions independently of the mechanism for fixing the cylinder block and the mechanism for holding the sealing jig in the cylinder bore, each drive source and holding mechanism are required separately. There was a problem that the structure was complicated and the cost was high. Particularly, a cylinder block plating apparatus for a multi-cylinder engine has a remarkably increased structure complexity and cost.

  Furthermore, with the recent miniaturization of the engine, the cylinder block has also been miniaturized, and the cylinder block plating apparatus for a multi-cylinder engine has an appropriate space for driving, such as an air cylinder for expanding the diameter of the sealing jig. It is difficult to make necessary drive sources in parallel for each cylinder.

  Therefore, the present invention provides a low-cost structure with high position accuracy of the seal position and capable of fixing the cylinder block and holding the seal jig with a simple operation, and is capable of flexibly responding to engine downsizing. A plating apparatus is proposed.

  In order to solve the above-described problems, a plating apparatus according to the present invention includes a mounting table on which a cylinder block having a cylindrical inner peripheral surface forming a cylinder bore can be placed, and an opening on one side of the cylinder bore from the cylinder bore. An electrode which is inserted into the cylinder and forms an annular processing liquid flow path between the inner peripheral surface of the cylinder, and a sealing jig which is provided near the opening on the other side of the cylinder bore provided at the free end of the electrode An expansion seal member which is provided in the seal jig and can be expanded and contracted to be inserted into the cylinder bore and in an expanded state in which the opening end on the other side of the inner peripheral surface of the cylinder can be sealed; A drive device that is detachably connected to operate the expansion seal member in an expanded state; an upper jig that sandwiches and holds the cylinder block together with the mounting table; Characterized by comprising a spring for adjusting the position when movably holding the drive unit in a jig to connecting the sealing jig and the driving device.

  According to the present invention, there is provided a low-cost structure that has a high position accuracy of the seal position, can be fixed with a simple operation for fixing the cylinder block and holding the seal jig, and can be flexibly adapted to downsizing of the engine. A plating apparatus can be provided.

The front view which showed the plating processing apparatus of the cylinder block which concerns on embodiment of this invention. Sectional drawing which showed the plating processing apparatus of the cylinder block which concerns on embodiment of this invention. Sectional drawing which showed the plating processing apparatus of the cylinder block which concerns on embodiment of this invention. Sectional drawing which showed the sealing jig and cylindrical electrode of the plating processing apparatus of the cylinder block which concerns on embodiment of this invention. Sectional drawing which showed the upper jig and the air joint of the plating processing apparatus of the cylinder block which concern on embodiment of this invention. Sectional drawing which showed the upper jig and the air joint of the plating processing apparatus of the cylinder block which concern on embodiment of this invention. The flowchart which showed the metal-plating process using the metal-plating processing apparatus of the cylinder block which concerns on embodiment of this invention.

  Embodiments of a cylinder block plating apparatus according to the present invention will be described below with reference to FIGS.

  FIG. 1 is a front view showing a cylinder block plating apparatus according to an embodiment of the present invention.

  2 and 3 are cross-sectional views showing a cylinder block plating apparatus according to an embodiment of the present invention taken along line II-II in FIG. 2 is a diagram showing a state during the plating process of the plating apparatus 1 of the cylinder block 101 (hereinafter simply referred to as “plating apparatus 1”), and FIG. It is a figure which shows the state in the middle of preparation.

  As shown in FIGS. 1 to 3, the plating apparatus 1 includes a mounting table 3 on which a cylinder block 101 having a cylindrical inner peripheral surface 103 that forms a cylinder bore 102 can be freely mounted, and one side of the cylinder bore 102 ( Here, a cylindrical electrode 6 (electrode) that is inserted into the cylinder bore 102 through the opening 102a on the cylinder head side) and forms the annular processing liquid flow path 4 between the cylinder inner peripheral surface 103 and the cylindrical electrode 6 is free. A seal jig 7 provided near the opening 102b on the other side (here, the crankcase side) of the cylinder bore 102, an upper jig 8 that sandwiches and holds the cylinder block 101 together with the mounting table 3, and a seal An air joint 9 (driving device) for supplying a working fluid as a driving source for the jig 7 and a processing liquid circulation for supplying a plating processing liquid 11 to the processing liquid flow path 4. It includes location 12 (plating liquid supply unit), and a power supply 13 for generating a potential difference between the cylinder block 101 and the cylindrical electrode 6.

  The plating apparatus 1 is configured such that the plating block 11 and the cylindrical electrode 6 are circulated through the processing liquid flow path 4 formed by a gap between the cylinder inner peripheral surface 103 and the cylindrical electrode outer peripheral surface 6a. A potential difference is generated between them, and a plating layer is formed on the inner circumferential surface 103 of the cylinder.

  The cylinder block 101 is made of a casting made of, for example, an aluminum alloy, and is a part of a member constituting an internal combustion engine (not shown) such as a parallel multi-cylinder engine. The cylinder block 101 includes a cylindrical inner peripheral surface 103 that forms a hollow cylinder bore 102, a mating surface 105 for a cylinder head (not shown), and a mating surface 106 for a crankcase (not shown). . The cylinder block 101 is plated on the cylinder inner peripheral surface 103 by the plating apparatus 1.

  2 and 3 show the plating apparatus 1 in one cylinder bore 102 out of a plurality of, for example, three cylinder bores 102 included in the cylinder block 101. The plating apparatus 1 includes the same configuration in parallel for the other cylinder bores 102.

  The mounting table 3 of the plating apparatus 1 includes a lower jig 15 that supports its own weight, a thick insulating member 16 that is detachably disposed on the upper surface of the lower jig 15, and an upper surface of the insulating member 16. A thick plate-like conductive plate 17 provided, a cylindrical seal cradle 18 penetrating the insulating member 16, and an annular seal member 21 provided on the top of the seal cradle 18 are provided.

  The lower jig 15 includes a lower jig collection hole 23 having substantially the same diameter as the cylinder inner peripheral surface 103 and includes an electrode support 24 that extends into the lower jig collection hole 23. The electrode support 24 is a hollow tube.

  The conductive plate 17 is configured by combining a plurality of stainless steel flat plates in layers, and has a smooth mounting surface 25. The cylinder block 101 is mounted on the mounting table 3 with the mating surface 105 excluding the cylinder head side opening edge of the cylinder bore 102 being in contact with the mounting surface 25. The conductive plate 17 and the cylinder block 101 are electrically connected by the mounting surface 25 and the mating surface 105 that are in contact with each other. The conductive plate 17 is configured to be movable along the center line of the cylinder bore 102 by an elevating device (not shown) such as a hydraulic cylinder. Further, the conductive plate 17 holds the seal cradle 18 and the seal member 21 so as to be sandwiched between a plurality of stainless steel flat plates combined in layers.

  The insulating member 16 is an insulator formed of, for example, silicon rubber. The insulating member 16 maintains liquid tightness between the lower jig 15 and the conductive plate 17 and electrically insulates the lower jig 15 and the cylinder block 101 from each other. Thus, the plating apparatus 1 can efficiently form the plating layer on the cylinder inner peripheral surface 103 by energizing the cylindrical electrode 6 and the cylinder block 101 via the plating treatment liquid 11 flowing in the treatment liquid flow path 4. .

  The seal cradle 18 is an insulator formed of, for example, silicon rubber, and the seal member 21 is positioned on the cylinder head side opening edge of the cylinder bore 102. Further, the hollow portion of the seal cradle 18 forms a recovery hole 27.

  The seal member 21 is an insulator formed of, for example, silicon rubber, and is provided at the free end of the seal cradle 18. Further, when the cylinder block 101 is placed on the conductive plate 17, the seal member 21 is sandwiched between the mating surface 105 and the seal cradle 18 while contacting the cylinder head side opening edge of the cylinder bore 102. The liquid tightness between 102 and the recovery hole 27 is maintained.

  The conductive plate 17, the seal cradle 18, and the seal member 21 can be attached and detached integrally from the lower jig 15. In the plating apparatus 1, first, the cylinder block 101 is disposed on the mounting surface 25 of the conductive plate 17, and then the cylinder block 101 and the conductive plate 17 are collectively mounted on the insulating member 16. 3, the cylinder block 101 is placed.

  The cylindrical electrode 6 is supported by the free end of the electrode support 24 of the lower jig 15 and protrudes upward from the collection hole 27 toward the mounting table 3. Further, the cylindrical electrode 6 is electrically connected to the power supply device 13 via the electrode support 24. Further, the cylindrical electrode 6 is disposed in the cylinder bore 102 when the cylinder block 101 is mounted on the mounting table 3, and the annular processing liquid channel is disposed between the cylindrical electrode outer peripheral surface 6 a and the cylinder inner peripheral surface 103. 4 is formed. Furthermore, the cylindrical electrode 6 has a cylindrical cylindrical electrode inner peripheral surface 6 b that forms the in-electrode processing liquid supply channel 29.

  The sealing jig 7 closes the vicinity of the opening 102 b on the crankcase side of the cylinder bore 102 when the plating solution 11 is introduced into the treatment solution flow path 4. Further, the sealing jig 7 is disposed in the cylinder bore 102 together with the cylindrical electrode 6 when the cylinder block 101 is placed on the mounting table 3. Further, the seal jig 7 is provided with an expansion seal member 31 that is actuated by air supplied from the air joint 9 and maintains fluid tightness in the vicinity of the opening 102b on the crankcase side of the cylinder bore 102.

  The upper jig 8 is brought into contact with the mating surface 106 of the cylinder block 101 and sandwiches and holds the cylinder block 101 between the upper jig 8 and the mounting table 3. Further, the upper jig 8 is configured to be movable in a direction approaching the mounting table 3 by an elevating device (not shown) such as a hydraulic cylinder, and presses the mating surface 106 of the cylinder block 101. Further, the upper jig 8 includes a cylindrical air joint holding member 32 that slidably holds the air joint 9 along the moving direction of the upper jig 8, and the air joint 9 can be moved to the upper jig 8. A coil spring 33 that biases in the direction of the mounting table 3 while holding and adjusts the position of the air joint 9 when the air joint 9 and the sealing jig 7 are connected to each other is provided.

  The air joint 9 includes a working fluid supply path 34 that supplies air as a working fluid for operating the expansion seal member 31 to the sealing jig 7. In addition, the air joint 9 is connected to the sealing jig 7 in accordance with the operation of the upper jig 8 pressing the mating surface 106 of the cylinder block 101, and can be supplied with a working fluid.

  The processing liquid circulation device 12 includes a tank 36 that stores the plating processing liquid 11, a supply path 37 that guides the plating processing liquid 11 from the tank 36 to the mounting table 3, a pump 38 provided in the supply path 37, and the mounting table 3. A recovery path 39 for recovering the plating solution 11 from the tank 36 and a flow meter 41 provided in the recovery path 39 are provided. Further, the processing liquid circulation device 12 adjusts the operation output of the pump 38 by feedback control from the measured value of the flow meter 41 to control the flow rate of the plating processing liquid 11.

  The power supply device 13 is electrically connected to the electrode support 24 and the conductive plate 17, respectively, and generates a potential difference between the cylinder block 101 and the cylindrical electrode 6. In addition, when the cylinder inner peripheral surface 103 is plated, the power supply device 13 supplies electricity so that the cylindrical electrode 6 serves as an anode and the cylinder block 101 serves as a cathode.

  With such a configuration, the plating apparatus 1 passes from the tank 36 to the treatment liquid flow path 4 through the supply path 37 of the treatment liquid circulation apparatus 12, the tube of the electrode support 24, and the in-electrode treatment liquid supply flow path 29 in order. The plating treatment liquid 11 is fed, and the gap formed between the collection hole 27 of the seal cradle 18 and the cylindrical electrode 6 from the treatment liquid flow path 4, the lower jig collection hole 23 and the electrode of the lower jig 15. The plating solution 11 is collected in the tank 36 sequentially through the gap formed between the support 24 and the collection path 39 of the treatment solution circulation device 12.

  FIG. 4 is a cross-sectional view illustrating a sealing jig and a cylindrical electrode of a cylinder block plating apparatus according to an embodiment of the present invention.

  As shown in FIG. 4, the sealing jig 7 of the plating apparatus 1 is attached to the free end of the cylindrical electrode 6.

  The seal jig 7 includes an expansion seal member 31 that can be expanded and contracted into a storage state in which it can be inserted into the cylinder bore 102 and an expansion state in which the opening end on the crankcase side of the cylinder inner peripheral surface 103 can be liquid-tightly sealed. A lower seal plate 42 and a seal base 43 that sandwich and hold the member 31 and a bolt 44 that fixes the lower seal plate 42 and the seal base 43 to the free end of the cylindrical electrode 6 are provided.

  The expansion seal member 31 is formed in a floating ring shape using a stretchable material (for example, an elastic member such as silicon rubber or fluororubber). The inner peripheral side portion of the expansion seal member 31 has an opening 31a and includes engagement protrusions 46 formed on both sides in the vicinity of the opening 31a. The outer peripheral side portion of the expansion seal member 31 is a seal surface 31 b that can contact the cylinder inner peripheral surface 103. The outer diameter dimension of the expansion seal member 31 is set to a value slightly smaller than the inner diameter dimension of the cylinder inner peripheral surface 103 in a state where the working fluid is not supplied (contracted state).

  The lower seal plate 42 includes a lower disc portion 47 formed in a disc shape, a lower bulging portion 48 that protrudes toward the seal base 43 and is integrally formed at the center of the lower disc portion 47, and a cylindrical shape. A frustoconical bulging portion 49 integrally formed at the center of the lower disk portion 47 so as to protrude toward the electrode 6 side. The seal lower plate 42 is formed using an insulator, and insulates the seal base 43 formed using metal from the cylindrical electrode 6.

  The lower disk portion 47 has an engagement groove 52 that is recessed in a ring shape at a boundary portion with the lower bulging portion 48.

  The frustoconical bulge 49 has a recess 53 into which the free end of the cylindrical electrode 6 is fitted.

  The seal base 43 includes an upper disk part 55 formed in a disk shape and an upper bulging part 56 formed integrally in the center of the upper disk part 55.

  The upper disk portion 55 has a recess 58 in which the lower bulging portion 48 of the seal lower plate 42 is fitted, and an engagement groove 59 that is recessed in a ring shape on the outer edge of the recess 58.

  The lower seal plate 42 and the seal base 43 restrain the inner peripheral side of the expansion seal member 31 by engaging the engagement protrusion 46 with the engagement groove 52 and the engagement groove 59. Further, the lower seal plate 42 and the seal base 43 are deformed so that the expansion seal member 31 is sandwiched between the upper disc portion 55 and the lower disc portion 47 so that the outer diameter of the expansion seal member 31 into which the working fluid flows is increased. The expansion in the direction along the center line of the cylinder bore 102 of the expansion seal member 31 is restricted.

  The sealing jig 7 includes a ring member 64 that is fitted into the outer periphery of the lower bulging portion 48 of the lower seal plate 42 and is inserted inside the expansion seal member 31.

  The ring member 64 has a circumferential groove 66 continuously opened on the inner circumferential surface thereof, and a working fluid ejection hole 67 that communicates the circumferential groove 66 with the inside of the expansion seal member 31. The working fluid ejection holes 67 are opened at a plurality of locations (for example, three locations) in the circumferential direction of the ring member 64.

  Further, the sealing jig 7 has a working fluid introduction path 68 that passes through the upper bulging portion 56 of the seal base 43 and reaches the lower bulging portion 48 of the seal lower plate 42. The working fluid introduction path 68 is connected to the working fluid supply path 34 of the air joint 9 and communicates with the inside of the expansion seal member 31 via the circumferential groove 66 of the ring member 64.

  The free end of the cylindrical electrode 6 has a plurality of slit holes 69 that allow the in-electrode processing liquid supply channel 29 and the processing liquid channel 4 formed in the cylindrical electrode 6 to communicate with each other. The slit hole 69 allows the plating treatment liquid 11 supplied from the treatment liquid circulation device 12 to flow into the treatment liquid passage 4 from the in-electrode treatment liquid supply passage 29. Thereby, the plating treatment liquid 11 flows in the treatment liquid flow path 4 from the crankcase side toward the cylinder head side.

  5 and 6 are sectional views showing an upper jig and an air joint of the cylinder block plating apparatus according to the embodiment of the present invention. 5 is a view showing a state in which the cylinder block 101 is held by the upper jig 8 and the mounting table 3. FIG. 6 shows that the upper jig 8 approaches the mounting table 3 and the air joint 9 is sealed. It is the figure which showed the state contact | abutted to the jig | tool 7. FIG.

  As shown in FIGS. 5 and 6, the air joint 9 of the plating apparatus 1 is provided in the upper jig 8 via the air joint holding member 32 and is urged toward the mounting table 3 by the coil spring 33. . The air joint 9 includes a columnar joint body 71 having a part of the working fluid supply path 34, double nuts 72 and 73 for adjustment that sandwich the coil spring 33 together with the air joint holding member 32, and the freedom of the air joint 9. A soft connecting portion 74 provided at the end and having a contact surface with the sealing jig 7 and the remaining portion of the working fluid supply path 34.

  Further, when the upper jig 8 is moved in a direction approaching the mounting table 3, the air joint 9 precedes the upper jig 8 against the mating surface 106 on the crankcase side of the cylinder block 101. Then, the connecting portion 74 is brought into contact with the sealing jig 7. Specifically, the air joint 9 brings the connecting portion 74 into contact with the sealing jig 7 approximately 10 mm ahead of the upper jig 8 coming into contact with the mating surface 106 of the cylinder block 101 on the crankcase side. .

  The adjustment double nuts 72 and 73 preliminarily apply an appropriate urging force to the coil spring 33 so that the pressing load between the connecting portion 74 and the sealing jig 7 can be appropriately adjusted. The adjustment double nuts 72 and 73 are screwed into the male thread portion 71 a of the joint body 71 and are configured to be movable in the longitudinal axis direction of the joint body 71. The pressing load between the connecting portion 74 adjusted by the adjusting double nuts 72 and 73 and the sealing jig 7 is preferably about 20 kg to about 50 kg.

  The connecting portion 74 is formed by using a circular thick rubber plate and constitutes a free end of the air joint 9 on the sealing jig 7 side. The connecting portion 74 is pressed and connected to the sealing jig 7 by the urging force applied from the coil spring 33 to the joint body 71. At this time, the connecting portion 74 causes the working fluid supply path 34 of the air joint 9 to communicate with the working fluid introduction path 68 of the sealing jig 7.

  FIG. 7 is a flowchart showing a plating process using the cylinder block plating apparatus according to the embodiment of the present invention.

  As shown in FIG. 7, the plating process of the cylinder block 101 using the plating apparatus 1 (hereinafter simply referred to as “plating process”) is a process S <b> 1 for mounting the cylinder block 101 on the mounting table 3. The cylindrical electrode 6 is disposed in the cylinder bore 102 of the cylinder block 101, the process S2 is formed between the cylinder inner peripheral surface 103 and the cylindrical electrode 6, and the upper jig 8 is mounted. 3, the step S 3 for connecting the air joint 9 and the sealing jig 7 and holding the cylinder block 101, the step S 4 for expanding the diameter of the sealing jig 7, and the crankcase side of the processing liquid channel 4. Step S5 of flowing the plating solution 11 from the cylinder head toward the cylinder head, and a step of plating the cylinder inner peripheral surface 103 by generating a potential difference between the cylindrical electrode 6 and the cylinder block 101 Has a 6, a.

  First, in step S <b> 1, the mating surface 105 of the cylinder block 101 is placed on the conductive plate 17. At this time, the cylinder block 101 and the conductive plate 17 are electrically connected. In step S 1, the cylinder block 101 is placed on the conductive plate 17, and at the same time, the seal member 21 is brought into contact with the opening edge on the cylinder head side of the cylinder bore 102 and is crushed. Keep.

  Next, in step S <b> 2, the conductive plate 17, the seal cradle 18, and the seal member 21 are moved together with the cylinder block 101 along the center line of the cylinder bore 102 by an elevating device (not shown), and are moved onto the insulating member 16. Place. As a result, the cylinder block 101 is placed on the placing table 3. At this time, the cylindrical electrode 6 and the sealing jig 7 are disposed in the cylinder bore 102.

  Next, in step S3, the upper jig 8 is moved toward the mounting table 3 by a lifting device (not shown). At the beginning of the upper jig 8 toward the mounting table 3, the air joint 9 protrudes toward the mounting table 3 by the biasing force of the coil spring 33. When the upper jig 8 approaches the mounting table 3, first, the connecting portion 74 of the air joint 9 comes into contact with the sealing jig 7. Thereafter, when the upper jig 8 further approaches the mounting table 3, the coil spring 33 is compressed and the air joint 9 and the sealing jig 7 are connected. When the upper jig 8 further approaches the mounting table 3, the cylinder block 101 is sandwiched and held between the upper jig 8 and the mounting table 3. When the cylinder block 101 is held by the upper jig 8 and the mounting table 3, the air joint 9 always presses the connecting portion 74 against the seal jig 7 by the coil spring 33 to bring it into close contact therewith.

  Next, in step S <b> 4, working fluid (air) is supplied from the air joint 9 to the sealing jig 7. The sealing jig 7 expands the diameter of the expansion seal member 31 with the supplied working fluid, and maintains the fluid tightness in the vicinity of the opening 102b on the crankcase side of the cylinder bore 102. As a result, the treatment liquid flow path 4 surrounded by the cylindrical electrode outer peripheral surface 6 a, the cylinder inner peripheral surface 103 and the sealing jig 7 is formed.

  Next, in step S5, the pump 38 of the processing liquid circulation device 12 is operated, and the plating process is performed sequentially through the tank 36, the supply path 37, the in-electrode processing liquid supply path 29, the processing liquid path 4 and the recovery path 39. Circulate liquid 11. In this circulation flow, the plating treatment liquid 11 is caused to flow from the crankcase side of the treatment liquid flow path 4 toward the cylinder head side.

  Next, in step S6, electricity is supplied by the power supply device 13 so that the cylindrical electrode 6 becomes an anode and the cylinder block 101 becomes a cathode. As a result, a plating layer is formed on the cylinder inner peripheral surface 103 of the cylinder block 101.

  In the plating apparatus 1 according to the present embodiment configured as described above, the sealing jig 7 provided at the free end of the cylindrical electrode 6 is disposed in the cylinder bore 102 together with the cylindrical electrode 6. The positional relationship between 6 and the sealing jig 7 does not change. Further, the plating apparatus 1 according to the present embodiment restrains the expansion seal member 31 from expanding in the direction along the center line of the cylinder bore 102 (bore stroke direction) by the seal lower plate 42 and the seal base 43 of the seal jig 7. is doing. Accordingly, the plating apparatus 1 according to the present embodiment enables the positioning accuracy of the entire sealing jig 7 and the contact between the sealing jig 7 (more specifically, the expansion sealing member 31) in an expanded state and the cylinder inner peripheral surface 103. The reproducibility accuracy of the position is high, and the actual seal position with respect to the target position of the cylinder inner peripheral surface 103 can be accurately controlled.

  In general, when the relative positional relationship between the cylindrical electrode 6 and the sealing position by the sealing jig 7 changes, the range in which the plating layer on the cylinder inner peripheral surface 103 is formed varies, and the sealing jig 7 The film thickness of the nearby plating layer will fluctuate, resulting in poor plating. However, the plating apparatus 1 according to the present embodiment has the positioning accuracy of the entire sealing jig 7 and the contact position between the expanded sealing jig 7 (more specifically, the expanded sealing member 31) and the cylinder inner peripheral surface 103. The reproducibility accuracy is high, and the range in which the plating layer is formed can be maintained appropriately, and an appropriate film thickness of the plating layer can be obtained.

  The plating apparatus 1 according to the present embodiment includes an upper jig 8 and a mounting table 3 for fixing the cylinder block 101, and a cylindrical electrode 6 for holding the sealing jig 7 in the cylinder bore 102. The cylinder block 101 is sandwiched between the base plate 8 and the mounting table 3 so as to be disposed at a position where it can be appropriately plated. In addition, the plating apparatus 1 according to the present embodiment can also connect the sealing jig 7 and the air joint 9 by an operation of sandwiching the cylinder block 101 between the upper jig 8 and the mounting table 3. As described above, the plating apparatus 1 according to the present embodiment can perform the plating process of the cylinder block 101 only by moving the upper jig 8, so that the plating process can be performed with a simple and inexpensive structure. .

  Furthermore, since the plating apparatus 1 according to the present embodiment uses the air joint 9 including the working fluid supply path 34 that guides the working fluid for expanding the expansion seal member 31 of the sealing jig 7, It is not necessary to place a drive source that requires a suitable space for each cylinder in parallel with each other for each cylinder, and the plating process for a small cylinder block can be easily performed.

  Furthermore, the plating apparatus 1 according to the present embodiment holds the cylinder block 101 by sandwiching the mating surface 105 with the cylinder head and the mating surface 106 with the crankcase, and the sealing jig by the biasing force of the coil spring 33. 7 has a structure in which an air joint 9 is connected.

  In general, each part of the cylinder block and the plating apparatus is accompanied by thermal expansion due to a temperature rise in the pre-plating process or the plating process, but the amount of expansion varies depending on the difference in thermal expansion coefficient of each part. This difference in expansion amount is caused by the relative positional relationship between the upper jig 8 that holds the cylinder block 101 and the mounting table 3, and the relative relationship between the air joint 9 that is connected to the sealing jig 7 and the upper jig 8. Different positional relationships from each other. If it does so, there exists a possibility that the plating apparatus 1 may lose the holding force of the cylinder block 101, or a clearance gap may be produced between the sealing jig 7 and the air joint 9, and the expansion seal member 31 cannot maintain the diameter expansion. . However, in the plating apparatus 1 according to this embodiment, the mounting table 3, the cylinder block 101, the upper jig 8, the cylindrical electrode 6, and the sealing jig are provided by the coil spring 33 that presses the air joint 9 against the sealing jig 7. 7 and the air joint 9 can be absorbed, so that the cylinder block 101 can be reliably held and the diameter of the expansion seal member 31 can be reliably maintained.

  The plating apparatus 1 according to the present embodiment includes an air joint 9 that is independent of each cylinder bore 102 of the cylinder block 101. Accordingly, in the plating apparatus 1 according to the present embodiment, the lengths of the cylinder bores 102 in the bore stroke direction are individually different, or the parallelism of the mating surface 105 with the cylinder head and the mating surface 106 with the crankcase is uniform. Even if the length of the cylindrical electrode 6 is not different, the sealing jig 7 and the air joint 9 can be reliably connected. Further, when the plating treatment apparatus 1 according to the present embodiment changes the length by inserting a spacer (not shown) or the like into the cylindrical electrode 6, the amount of compression of the coil spring 33 by the adjusting double nuts 72 and 73 is set. By adjusting, the various cylinder blocks 101 can be easily plated without changing the air joint 9.

  Therefore, according to the plating apparatus 1 according to the present invention, the position accuracy of the seal position is high, and an inexpensive structure that can fix the cylinder block 101 and hold the seal jig 7 with a simple operation is provided. It can respond flexibly to conversion.

DESCRIPTION OF SYMBOLS 101 Cylinder block 102 Cylinder bore 102a Opening 102b Opening 103 Cylinder inner peripheral surface 105 Matching surface 106 Matching surface 1 Plating apparatus 3 Mounting table 4 Process liquid flow path 6 Cylindrical electrode 6a Cylindrical electrode outer peripheral surface 6b Cylindrical electrode inner peripheral surface 7 Seal jig 8 Upper jig 9 Air joint 11 Plating treatment liquid 12 Treatment liquid circulation device 13 Power supply device 15 Lower jig 16 Insulating member 17 Conductive plate 18 Seal receiving base 21 Seal member 23 Lower jig recovery hole 24 Electrode support base 25 Mounting surface 27 Recovery hole 29 In-electrode treatment liquid supply flow path 31 Expansion seal member 31a Opening 31b Seal surface 32 Air joint holding member 33 Coil spring 34 Working fluid supply path 36 Tank 37 Supply path 38 Pump 39 Recovery path 41 Flow meter 42 Lower seal plate 43 Seal base 44 Bolt 46 Engaging projection 47 Lower disk portion 48 Lower bulging portion 49 frustoconical bulging portion 52 engaging groove 53 concave portion 55 upper disk portion 56 upper bulging portion 58 concave portion 59 engaging groove 64 ring member 66 circumferential groove 67 working fluid ejection hole 68 working fluid introduction path 69 Slit hole 71 Joint body 71a Male thread part 72 Double nut 74 for adjustment Connection part

Claims (6)

A mounting table on which a cylinder block having a cylindrical inner peripheral surface forming a cylinder bore can be mounted;
An electrode that is inserted into the cylinder bore from an opening on one side of the cylinder bore and forms an annular processing liquid channel between the cylinder inner peripheral surface;
A sealing jig provided at the free end of the electrode and disposed in the vicinity of the opening on the other side of the cylinder bore;
An expansion seal member that is provided in the sealing jig and can be expanded and contracted into a storage state that can be inserted into the cylinder bore and an expanded state in which the opening end on the other side of the cylinder inner peripheral surface can be sealed;
A drive device that is detachably connected to the sealing jig and operates the expansion seal member in an expanded state;
An upper jig for sandwiching and holding the cylinder block together with the mounting table;
A cylinder block plating apparatus, comprising: a spring that holds the drive device movably on the upper jig and adjusts a position when the drive device and the sealing jig are connected.   The upper jig is lowered from above the mounting table to sandwich the cylinder block between the mounting table and the upper jig, and the drive device is lowered integrally with the upper jig to form the seal. The cylinder block plating apparatus according to claim 1, wherein the cylinder block plating apparatus is connected to a jig. 3. The cylinder block plating apparatus according to claim 1, wherein the drive mechanism is configured to be able to supply a working fluid that operates the expansion seal member to an expanded state to the seal jig. 4. The cylinder block plating apparatus according to any one of claims 1 to 3, wherein the electrode has a flow path for supplying a plating solution to the inner peripheral surface of the cylinder. The cylinder block includes a crank journal formed in a crankcase so as to cover the opening on the other side of the cylinder bore,
The electrode and the sealing jig are inserted into the cylinder bore from the cylinder head side of the cylinder block,
5. The cylinder block plating apparatus according to claim 1, wherein the drive mechanism is coupled to the seal jig from the crankcase side. 6. 6. The cylinder block plating apparatus according to claim 1, wherein the expansion seal member has an outer diameter close to an inner diameter of the cylinder inner peripheral surface.

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