JPH093687A - Pretreatment method for plating and the same equipment - Google Patents

Abstract

(57) [Summary] [Purpose] In order to prevent pretreatment of plating on the inner surface of a hollow work and to prevent the treatment liquid from adhering to the other parts, supply the treatment liquid into the hollow work to determine In this case, the temperature of the treatment liquid in the work is kept at an appropriate temperature so that the pretreatment can be favorably performed. [Structure] A cylinder block which is a work 1 is installed on a work supporting portion 11 of a processing apparatus main body 10, a heater 12 is arranged in a cylinder bore 1a of the work 1, and a treatment liquid is supplied into the work 1. To fill the cylinder bore 1a. Then, the treatment liquid is heated by the heater 12 and kept at a predetermined temperature and retained in the work 1 for a predetermined time to pretreat the cylinder bore peripheral surface, and after a predetermined time, the treatment liquid is discharged from the work 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plating pretreatment method and apparatus for pretreating the inner surface of a hollow work such as an engine cylinder block for plating.

[0002]

2. Description of the Related Art Generally, in a plating system for electroplating a metal surface, degreasing and
Various pretreatments such as alkali etching and mixed acid etching are performed by using treatment liquids corresponding to the respective pretreatments.

Conventionally, as a method of such a pretreatment for plating, the treatment liquid is stored in a relatively large treatment layer, and the work is carried into the treatment tank to immerse the work in the treatment liquid. What is done is generally known.

[0004]

By the way, when plating the inner surface of a hollow work, it is only the inner surface of the work that needs to be subjected to the above-mentioned pretreatment. Conventionally, in general, the whole work is immersed in the processing liquid in order to perform the processing easily.

However, in such a case, the amount of the processing liquid adhering to the work taken out from the processing tank after the processing and taken out becomes large, so that the economical efficiency is poor and the work cleaning work after the processing is troublesome. In addition, a large-capacity processing tank for immersing the work is required, and there is a problem that the system becomes large.

As a measure against such a problem, a work (for example, a cylinder block) is supported by a work supporting portion,
With the lower end opening of the hollow part (for example, cylinder bore) of the work closed, the process liquid is supplied from the process liquid storage part into the work, and the hollow part is filled with the process liquid and kept in this state for a certain period of time. A method is conceivable in which the inner surface of the work (peripheral surface of the cylinder bore) is pretreated and then the processing liquid is discharged from the inner surface of the work. In this way, since the treatment liquid contacts only the inner surface of the work to be pretreated, the amount of treatment liquid adhering to the work and taken out after the treatment is reduced,
Further, a treatment tank for immersing the work is unnecessary.

However, when such a method is applied to an alkali etching process or the like which requires the treatment liquid to be heated to a predetermined temperature, the treatment liquid should be preheated to a predetermined temperature in a reservoir or the like. Even when supplied to the work, heat may be taken by the work or the like while the treatment liquid is retained in the hollow portion of the work to lower the temperature of the treatment liquid, which may reduce the pretreatment performance. The problem arises that there is.

In view of the above situation, the present invention avoids the treatment liquid from adhering to a portion other than the inner surface of the work by supplying the treatment liquid into the hollow work and allowing it to stay for a predetermined time. At the same time, it is possible to provide a pretreatment for plating and an apparatus for the same, which can pretreat the inner surface of the workpiece and can maintain the temperature of the treatment liquid in the workpiece at an appropriate temperature to perform favorable pretreatment. To aim.

[0009]

The invention according to claim 1 is
A method of performing pretreatment for plating on the inner surface of a hollow work, wherein the work is set on the work supporting surface of the processing apparatus main body, and a heater is placed in the hollow portion of this work solution, Was supplied into the work to fill the hollow portion, and the treatment liquid was discharged from the work after the treatment liquid was heated by the heater and kept at the predetermined temperature for a predetermined time in the work. It is a thing.

The invention according to claim 2 is an apparatus for performing a pretreatment for plating on an inner surface of a hollow work, wherein the processing apparatus main body closes a lower end side opening of the hollow portion of the work. A work supporting part that supports the work in a state, and a heater that protrudes into the hollow part when the work is supported on the work supporting part, and the work solution is pumped from the processing solution storage part through the pump. A processing liquid supply passage for supplying the processing liquid on the support portion into the work, a processing liquid discharge passage for discharging the processing liquid from the work, and valves for opening and closing the processing liquid supply passage and the processing liquid discharge passage, respectively. Is.

In this apparatus, the supply of the processing liquid into the work by opening the processing liquid supply passage and operating the pump and stopping the supply of the processing liquid when the supply amount of the processing liquid reaches a predetermined amount. In addition, the valve and the pump are arranged so that the processing liquid retention state in the work is maintained by closing the processing liquid supply passage and the processing liquid discharge passage, and the processing liquid is discharged by opening the processing liquid discharge passage. It is preferable to include a control means for controlling the above, and for energizing the heater at least when the treatment liquid remains in the work (claim 3).

[0012]

According to the method of claim 1, the treatment liquid is supplied from the treatment liquid storage portion into the hollow work to fill the hollow portion with the treatment liquid, and in this state, the treatment is performed in the work for a predetermined time. By preserving the liquid, the inner surface of the work is pretreated. Then, the treatment liquid is prevented from adhering to other parts of the work, and the amount of the treatment liquid adhering to and carried out from the work is reduced. Further, when the treatment liquid is retained in the work as described above, the treatment liquid is heated by the heater, so that the temperature drop of the treatment liquid during the retention time is prevented and the treatment liquid is kept at an appropriate temperature. To be kept.

According to the apparatus of the second aspect, when the work is supported on the work supporting portion, the heater projects into the hollow portion, and in this state, the valve of the treatment liquid supply passage is opened and the pump is provided. Is driven to supply the processing liquid into the work from the reservoir, and when a predetermined amount of the processing liquid is supplied, the processing liquid supply passage is closed to retain the processing liquid in the work, and the heater The treatment liquid is kept at a predetermined temperature by being energized, and then the treatment liquid is discharged from the inside of the work by opening the valve of the treatment liquid discharge passage.

Particularly, when the control means for controlling the operation of the pump and the valve and the energization of the heater are provided, the above method is automatically performed.

[0015]

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows an outline of an entire plating processing system including a pretreatment section to which the present invention is applied. In this plating processing system, various pretreatment units A to D, a plating processing unit E, and a drying unit F are arranged along the plating processing line in an arrangement corresponding to the work order. Specifically, the degreasing processing section A, the alkali etching processing section B, the mixed acid etching processing section C, the alumite processing section D, the plating processing section E, and the drying section F are arranged in this order.

Each of the processing sections A to E has a washing section Ga, Gb, Gc, G including a treating solution recovery tank and a washing tank.
d and Ge are attached. Further, the work input part 2 is provided on the starting end side of the plating processing line, and the work unloading part 3 is provided on the end side of the plating processing line. Further, above the carrying line, a carrying means 4 for carrying the work 1 along the carrying line is provided.

Further, for each of the pretreatment units A to D, a treatment liquid supply / discharge facility 5 including a treatment liquid storage portion, a treatment liquid supply pump, a treatment liquid supply / discharge pipe, and the like is provided.
A, 5B, 5C, 5D are arranged, and a plating solution supply / discharge facility 5E including a plating solution storage section, a pump, a pipe and the like is provided for the plating processing section E as well.

FIG. 2 shows an embodiment of the apparatus of the present invention. This apparatus is applied to a pretreatment section such as a degreasing treatment section A, an alkali etching treatment section B and a mixed acid etching treatment section C in the plating system. To be done. Also in this figure,
As the work 1, an in-line four-cylinder engine for an automobile or the like is shown. The work 1 includes a crankcase 1 and a portion in which four cylinder bores (hollow portions) 1a arranged in series are formed.
b is integrally provided, and both ends of each of the cylinder bores 1a are open to the head side and the crankcase 1b side.

In the figure, the processing apparatus main body 10 includes a work supporting portion 11 for supporting the work 1 and four heaters 12 arranged at predetermined intervals so as to correspond to the cylinder bores 1a of the work 1. And each heater 12 projects upward from the work support 11.
Then, the work 1 composed of the cylinder block is placed on the work support portion 11 in an upside down state when mounted on a vehicle, that is, with the crankcase 1b facing upward, and in this state, the respective cylinder bores are placed. The opening on the lower end side (head side) of 1a is closed by the upper surface of the work support portion 11, and the heater 12 is projected into each cylinder bore 1a. Further, each of the heaters 12 is electrically connected to a temperature controller 19, and the control means (ECU) 20 controls energization of the heater 12 via the temperature controller 19.

The structure of the processing apparatus main body 10 will be described in detail with reference to FIG. An annular seal ring 13 that abuts around the head-side opening is provided, and a heater mounting portion 14 including a screw hole or the like is provided inside thereof.
Is provided, and the lower end of the heater 12 is fixed to the heater mounting portion 14 by screwing or the like.

In the present embodiment, the heater 12 also serves as a spacer for reducing the consumption of the processing liquid, as will be described later, and is formed in a cylindrical shape so that the work 1 is placed on the work supporting portion 11. The heater 12 occupies most of the space in the cylinder bore 1a in a state where the heater 12 is mounted and the heater 12 projects into the cylinder bore 1a.
The height and diameter of the heater 12 are set so that a constant (for example, about 3 mm) space 15 is formed between the outer peripheral surface of the cylinder 2 and the peripheral surface of the cylinder bore 1a.

Further, in the work support portion 11, a liquid flow hole 1 connected to a processing liquid supply pipe (processing liquid supply passage) 21 and a processing liquid discharge pipe (processing liquid discharge passage) 22 shown in FIG.
6 is formed, and the liquid circulation hole 16 is opened at a portion between the spacer 12 and the seal ring 14 so as to communicate with the gap 15.

For example, when the work 1 is a cylinder block of a single-cylinder engine for a motorcycle, one heater 12 and a seal ring 13 are correspondingly provided.
In order to dispose the liquid flow holes 16 and the like in the processing apparatus main body 10 or to arrange a plurality of such works 1 on the work supporting portion 11 and process them simultaneously, the heaters 12 are provided at a plurality of locations corresponding to the respective works 1. Seal ring 13, liquid circulation hole 1
6 openings may be provided, and a cylinder block of a multi-cylinder engine such as a 4-cylinder engine may be used as the work 1
In such a case, the heater 12, the seal ring 13, the openings of the liquid circulation holes 16 and the like may be arranged at a plurality of locations corresponding to the respective cylinders. Also. In the example shown in FIG. 3, the liquid flow hole 16 is opened at one position between the spacer 12 and the seal ring 14, and the liquid flow hole 16 is connected via the three-way solenoid valve 17 to the processing liquid supply pipe 21 and the processing liquid. Although connected to the liquid discharge pipe 22, as shown in FIG.
The liquid circulation hole 16a connected to 1 and the liquid circulation hole 16b connected to the processing liquid discharge pipe 22 may be formed separately.

In addition, with respect to the processing apparatus body 10 shown in FIG.
As shown in the inside, the processing liquid tank 3 as a processing liquid storage unit
A processing liquid supply unit 30 including the processing liquid supply units 1 and 32 is provided, and the processing liquid supply pipe 21 is disposed between the processing liquid supply unit 30 and the processing apparatus main body 10. Further, in the present embodiment, a processing liquid recovery unit 40 including waste liquid tanks 41 and 42 for recovering the used processing liquid (waste liquid) is provided, and a space between the processing liquid recovery unit 40 and the processing apparatus main body 10 is provided. The processing liquid discharge pipe 22 is provided in the.

The processing liquid supply pipe 21 is provided with a processing liquid supply pump 23 such as an air type quantitative pump and the like.
Flow meter 2 that integrates and measures the flow rate of processing liquid flowing through
4 and an electromagnetic valve 25 that opens and closes the pipe 21 are interposed. On the other hand, the treatment liquid discharge pipe 22 is provided with an electromagnetic valve 26 for opening and closing the pipe 22. Then, the processing liquid supply pump 23 and the integrated flow meter 2
4 and the valves 25 and 26 are electrically connected to the control means 20, and the control means 20 controls the operation of the processing liquid supply pump 23 and the opening and closing operations of the valves 25 and 26, thereby the processing apparatus main body. The supply and discharge of the processing liquid to and from 10 are controlled, and the processing liquid supply amount is controlled according to the output of the integrated flow meter 24 when the processing liquid is supplied.

The processing liquid supply unit 30 is equipped with two processing liquid tanks 31 and 32 that can be automatically exchanged. That is, as shown in FIG. 4, the treatment liquid supply unit 30 is provided with a movable base 33 that is movable in a fixed direction and is connected to the movable base drive means 34. Two movable bases 33 are provided on the movable base 33. The processing liquid tanks 31 and 32 are installed. In the illustrated example, the processing liquid tanks 31 and 32 are respectively movable tables 33.
It is supported by a support frame 35 that is tiltable upward, and this support frame 35 is connected to a tilting drive means 36. The end of the treatment liquid supply pipe 21 is inserted into one of the two treatment liquid tanks 31 and 32, and the suction port at the tip of the treatment liquid supply pipe 21 reaches near the bottom of the treatment liquid tank 31. The end of the liquid supply pipe 21 is pulled up by the attachment / detachment drive means 37 so that it can be detached from the treatment liquid tank 31. A liquid amount detecting means 38 for detecting the remaining amount of the processing liquid in the tank is provided for each of the processing liquid tanks 31 and 32. The liquid amount detecting means 38 is composed of, for example, a load cell that detects the load of the tank.

On the other hand, the processing liquid recovery section 40 is also equipped with two waste liquid tanks 41 and 42 so that they can be automatically replaced. That is, as shown in FIG. 2, a movable table 43 is provided which is movable in a fixed direction and is connected to a movable table driving means 44. On the movable table 43, two waste liquid tanks 41, 42 are provided.
Is installed. The end of the processing liquid recovery pipe 22 is inserted into one of the two waste liquid tanks 41 and 42.
At the time of tank replacement, the end portion of the processing liquid recovery pipe 22 is pulled up by the attachment / detachment drive means 45, so that the waste liquid tank 4
It is possible to leave from 1. A liquid amount detecting means 46 including a load cell is provided for each of the waste liquid tanks 41 and 42.

The driving means 34, 36, 37 and the liquid amount detecting means 38 in the processing liquid supply section 30 and the driving means 44, 45 and the liquid amount detecting means 46 in the processing liquid collecting section 40 are control means. Electrically connected to 20,
The control means 20 controls the driving means 34, 36, 37 according to the output of the liquid amount detecting means 38 and the driving means 44, according to the output of the liquid amount detecting means 46, which will be described in detail later.
The control of 45 is performed.

The capacities of the processing liquid tanks 31 and 32 of the processing liquid supply unit 30 are set to be commensurate with the consumption amount of the processing liquid for one day. For example, the capacity of one tank is set to about 20 liters. On the other hand, the waste liquid tanks 41 and 42 of the treatment liquid recovery unit 40 have a capacity of the treatment liquid tank 3 so as to store the used treatment liquid and the cleaning water used for the recovery treatment described later.
It is about 40 liters, which is twice as large as 1,32.

Further, the treatment liquid supply section 30 is provided with a heating means for heating the treatment liquid supplied from the treatment liquid tank to a predetermined temperature, if necessary.

Further, the apparatus shown in FIG. 2 is provided with cleaning water supply means for recovering the processing liquid with respect to the processing apparatus main body 10. This cleaning water supply means is a nozzle 4 for injecting cleaning water, which is arranged above each cylinder bore 1a of the work 1 when the work 1 is placed on the processing apparatus body 10.
8 and a wash water supply pipe 50 that guides the wash water sent from the ion exchange device 49 to each of the nozzles 48. The wash water supply pipe 50 has an integrated flow meter 51 and an electromagnetic valve 52. It is installed. The integrating flowmeter 51 and the valve 52 are electrically connected to the control means 20.

The washing water from the ion exchange device 49 is also sent to the washing tank 53 provided in the washing section, and the drainage water from the washing tank 53 is sent to the ion exchange raw water tank 54. The washing water supplied to the nozzle 48 or the washing tank 53 does not necessarily have to be ion-exchanged by the ion exchange device 49, and may be tap water or the like.

In FIG. 2, 55 is a local exhaust duct provided for the processing apparatus main body 10, 56 is a local exhaust duct provided for the processing liquid supply unit 30 and the processing liquid recovery unit 40, and 57 is a local exhaust duct. A sensor for detecting an evaporate of the treatment liquid, and 58 is an emergency exhaust fan that operates when the value detected by the sensor 57 is a predetermined value or more.

A method of pretreatment for plating using the apparatus of this embodiment will be described below.

In the pretreatment for plating, the work 1 conveyed by the conveying means 4 is placed on the work supporting portion 11 of the processing apparatus main body 10 and fixed by a fixing means (not shown). Next, the valve 26 of the processing liquid discharge pipe 22
Valve 2 of the processing liquid supply pipe 21 in a closed state.
When 5 is opened and the processing liquid supply pump 23 is driven, the processing liquid in the processing liquid tank 31 is supplied into each cylinder bore 1a of the work 1 through the processing liquid supply pipe 21.

Then, as shown in FIG. 5, when the processing liquid reaches the upper end of each cylinder bore 1a, the supply of the processing liquid is stopped. That is, based on the volume of the cylinder bore 1a, the volume of the heater 12, and the like,
The required supply amount for filling the processing liquid in each cylinder bore 1a is checked in advance, and when the processing liquid supply amount measured by the integrated flow meter 24 reaches the required supply amount, the valve 25 is closed and the processing is performed. The drive of the liquid supply pump 23 is stopped. Then, the valve 25 of the processing liquid supply pipe 21 and the valve 26 of the processing liquid discharge pipe 22 are closed for a predetermined time, and the processing liquid is retained in the cylinder bore 1a.

Further, at least while the treatment liquid is retained in the cylinder bore 1a, the heater 12 is energized through the temperature controller 19 to heat the treatment liquid in the cylinder bore 1a to a predetermined temperature. Kept in. For example, if the plating pretreatment is a degreasing treatment, it is 50 to 60 °.
C, about 70 ° C. for alkali etching treatment, and about 55 ° C. for alumite treatment. It should be noted that the energization 12 to the heater 12 may be performed during the period when the treatment liquid is being supplied.

After the elapse of the predetermined time, the processing liquid discharge pipe 2
By opening the valve 26 of No. 2, the waste liquid is collected from each cylinder bore 1a of the work 1 into the waste liquid tank 41 through the processing liquid discharge pipe 22.

Subsequently, by opening the valve 51 of the cleaning water supply pipe 50, the cleaning water sent from the ion exchange device 49 or water supply is sprayed from the nozzle 48 into each cylinder bore 1a of the work 1, The residual waste liquid adhering to the peripheral surface of the cylinder bore 1a and the spacer 12 is washed off by the cleaning water. When the supply amount of cleaning water measured by the integrated flow meter 51 reaches a predetermined amount, the valve 52 is closed and the supply of cleaning water is stopped. The mixed liquid of the cleaning water and the residual waste liquid sprayed into the cylinder bore 1a is collected in the waste liquid tank 41 through the treatment liquid discharge pipe 22.

The operation of the processing liquid supply pump 23 and the valves 25, 26, 52 and the energization of the heater 12 as described above are automatically performed under the control of the control means 20.

According to this method, the work supporting portion 11 is
By supplying the treatment liquid to the cylinder bore 1a of the upper work 1, the treatment liquid may contact only the peripheral surface of the cylinder bore of the work 1 to be pretreated, and the treatment liquid may adhere to other portions. Since there is no work, compared to the case where the work is immersed in the processing liquid in the processing tank as in the conventional case, the work 1
The amount of processing liquid that adheres to and is carried out is greatly reduced.
Therefore, the recovery of the processing liquid adhering to the work 1 after the pretreatment,
Work such as cleaning is simplified, and the processing liquid attached to the work 1 and carried out is prevented from being evaporated and released into the factory. In particular, if the residual waste liquid is recovered by supplying the cleaning water from the nozzle 46 into the cylinder bore 1a after discharging the processing liquid as described above, the carry-out of mixed acid as the processing liquid is sufficiently suppressed.

Further, the work 1 on the work supporting portion 11
The processing liquid supplied to the cylinder bore 1a is retained in the cylinder bore 1a for a predetermined time, and the cylinder bore 1a
The peripheral surface of a is pretreated, but at this time, the heater 12 provided in the treatment liquid body 10 is located in the cylinder bore 1a, and the heater 12 is energized,
The treatment liquid in the cylinder bore 1a is maintained at an appropriate temperature during the treatment liquid retention time. That is, in the pretreatment such as alkali etching which requires that the treatment liquid is heated to a predetermined temperature, the treatment liquid preheated to the predetermined temperature by the heating means provided on the treatment liquid supply side is placed in the work. Even if supplied, the temperature of the treatment liquid may decrease due to heat radiation during the treatment liquid retention time. However, in the present invention, the treatment liquid is heated by the heater 12 located in the work 1, so that the treatment liquid retention time is increased. The temperature drop of the processing liquid inside is prevented. The pretreatment is favorably performed by keeping the treatment liquid at an appropriate temperature in this way.

In this case, the heater 12 may be used to raise the temperature of the treatment liquid to a predetermined temperature in the work 1 without providing a heating means on the treatment liquid supply side. By providing the treatment liquid which has been heated to a predetermined temperature in advance by providing the workpiece 1,
It is preferable to heat the treatment liquid to a predetermined temperature with the heater 12 in terms of efficiency and accuracy of pretreatment.

Further, in the present embodiment, the treatment liquid discharged from the work 1 after the predetermined time has passed is collected in the waste liquid tank 41 of the treatment liquid collecting section 40, and the heater 12 also serves as a spacer. Because
This is advantageous for downsizing of the tank that stores the processing liquid.

That is, as in the embodiment shown in FIG. 6 described later, the processing liquid is supplied from the processing liquid storage tank 70 into the work 1 and the processing liquid discharged from the inside of the work 1 after the processing is returned to the storage tank 70. In such a case, it is necessary to increase the storage amount of the processing liquid in the storage tank 70 to some extent in order to stabilize the liquid quality, but the processing liquid discharged from the work 1 is treated by the processing liquid recovery unit as in the present embodiment. If you try to collect it in 40,
It is not necessary to increase the amount of the processing liquid stored in the processing liquid supply unit 30 in order to stabilize the liquid quality. You can leave it. Moreover, since the heater 12 also serves as a spacer and reduces the space to be filled with the treatment liquid in the cylinder bore 1a, the consumption amount of mixed acid is reduced, and accordingly, the treatment liquid tank 31, 31 The capacity of 32 and the capacity of the waste liquid tanks 41 and 42 in the processing liquid recovery unit 40 can be reduced. Along with this, the management and handling of the processing liquid becomes easy.

Further, in this embodiment, the work such as the replacement of the processing liquid tanks 31 and 32 and the replacement of the waste liquid tanks 41 and 42 according to the consumption of the processing liquid are automatically performed.

That is, the pretreatment for plating is repeated for the works 1 sent one after another by the carrying means 4, so that in the treatment liquid supply section 30, one treatment liquid to which the treatment liquid supply pipe 21 is connected. Although the processing liquid in the tank 31 gradually decreases, first, when the liquid amount detecting means 38 detects that the remaining amount of the processing liquid in the tank 31 is below a predetermined value, the tilting driving means 36 with respect to the tank 31. 2 is driven, the tank 31 is tilted, and the processing liquid is collected at the suction port side of the processing liquid supply pipe 21. Further, when it is detected that the processing liquid in the tank 31 is almost exhausted, the tank 31 is returned to the normal posture, and the attachment / detachment driving means 37 is driven, so that the end portion of the processing liquid supply pipe 21 is moved to the tank. After being separated from 31, the replacement drive means 34 is driven to move the other processing liquid tank 32 to the position corresponding to the processing liquid supply pipe 21 as shown by the two-dot chain line in FIG.
Moves, and the processing liquid supply pipe 21 is connected to the tank 32.

Further, by repeating the above-described pretreatment, the waste liquid in the waste liquid tank 41 to which the treatment liquid discharge pipe 22 is connected is gradually increased in the treatment liquid recovery section 40, but the tank 41 is full. When the liquid amount detecting means 46 detects that the tongue state has been reached, the detachment driving means 4
After the end portion of the processing liquid discharge pipe 22 is separated from the tank 41 by driving 5, the replacement driving means 44 is driven and the other waste liquid tank 42 corresponds to the processing liquid discharge pipe 22. The movable table 43 moves to the position, and the processing liquid discharge pipe 22 is connected to the tank 42.

The drive of the drive means 34, 36, 37 in the treatment liquid supply section 30 and the drive means 44, 45 in the treatment liquid recovery section 40 are automatically performed by the control of the control means 20. .

FIG. 6 shows another embodiment of the plating pretreatment apparatus of the present invention. Also in this embodiment, the processing apparatus main body 6
0 is arranged at a predetermined interval so as to correspond to the work supporting portion 61 and each cylinder bore 1a of the work 1,
Heater 62 protruding upward from the work support portion 61
And the liquid flow holes 64a and 65a communicating with the respective cylinder bores 1a of the work 1 are formed in the work support portion 61, and the liquid flow holes 64a and 65a are formed in the processing liquid supply pipe 64 and the processing liquid discharge pipe 65, respectively. It is connected. The heater 62 is electrically connected to the temperature controller 63, and the treatment liquid supply pipe 64 is provided with a treatment liquid supply pump 66, an integrating flowmeter 67 and a valve 68, and the treatment liquid discharge pipe 65. A valve 69 is installed in the valve, and these are controlled by a control means (not shown).

Although such a structure is substantially the same as that of the previous embodiment, in the present embodiment, a treatment liquid storage layer 70 for both supplying and recovering the treatment liquid is provided, and the treatment liquid storage layer 70 is provided.
The processing liquid supply pipe 64 and the processing liquid discharge pipe 65 are disposed between the processing device main body 60 and the processing device main body 60. If necessary, a heating means (not shown) for heating the processing liquid supplied from the processing tank 70 is attached to the processing tank 70.

Also in the case of the apparatus of this embodiment, the treatment liquid is transferred from the treatment liquid storage layer 70 to the above-mentioned state in a state where the work 1 is supported on the work supporting portion 61 and the heater 62 is positioned in each cylinder bore 1a. The treatment liquid is supplied to each cylinder bore 1a, and then the treatment liquid is heated by the heater 62 and kept at a predetermined temperature for a predetermined time.
By being retained inside, the cylinder bore peripheral surface is pretreated. Then, after the elapse of the predetermined time, the work 1
The processing liquid is discharged from the cylinder bore of the processing liquid. The processing liquid is returned to the processing liquid storage layer 70 through the processing liquid discharge pipe 65, mixed with the processing liquid in the processing liquid storage layer 70, and then the next work. 1 is subjected to pretreatment.

The specific structure of each part in the device of the present invention is not limited to that shown in each of the above-mentioned embodiments, and various modifications can be made. For example, the heater provided in the main body of the processing device is not limited to a cylindrical shape, and may be a plate shape, a pipe shape, or the like.
The size and shape may be such that they can penetrate into the hollow portion (cylinder bore) of the work 1.

In the above embodiment, the cylinder block of the engine for motorcycles or automobiles is used as the work, but other than this, the work is a hollow body such as a cylinder and the inner surface of which is plated. The present invention can be applied to pretreatment.

[0055]

As described above, according to the present invention,
With the hollow work placed on the work support part of the processing apparatus main body, the treatment liquid is supplied into the work, and the treatment liquid is allowed to stay in the work for a predetermined time and then the treatment liquid is discharged. Therefore, it is possible to effectively perform the pretreatment on the inner surface of the work and prevent the treatment liquid from adhering to other parts of the work, thereby reducing the carry-out amount of the treatment liquid. In addition, in particular, the heater is located in the work and the treatment liquid supplied into the work is heated by this heater to maintain a predetermined temperature, so the temperature of the treatment liquid decreases during the treatment liquid retention time. Can be prevented. By preserving the treatment liquid at an appropriate temperature in this way, pretreatment for plating can be favorably performed.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an entire plating system to which the present invention is applied.

FIG. 2 is a structural explanatory view of a plating pretreatment apparatus according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a processing apparatus main body.

FIG. 4 is an enlarged view of a processing liquid supply unit.

FIG. 5 is an explanatory diagram showing a state in which preprocessing is being performed.

FIG. 6 is a structural explanatory view showing another embodiment of the plating pretreatment apparatus.

[Explanation of symbols]

 1 Work 10,60 Processing device main body 11,61 Work support 12,62 Heater 21,64 Processing liquid supply pipe 22,65 Processing liquid discharge pipe 23,66 Processing liquid supply pump 25,26,68,69 Valve 18 Control means

Claims (3)

[Claims] 1. A method for pre-treating an inner surface of a hollow work for plating, wherein the work is set on a work supporting part of a processing apparatus main body, and a heater is arranged in the hollow part of the work. After that, the treatment liquid is supplied into the work to fill the hollow portion, and the treatment liquid is heated by the heater and kept at the predetermined temperature for a predetermined time in the work, and then the treatment liquid is discharged from the work. A pretreatment method for plating, which comprises discharging. 2. An apparatus for pre-treating an inner surface of a hollow work for plating, wherein the processing apparatus main body supports the work in a state of closing a lower end side opening of a hollow portion of the work. And a heater protruding into the hollow part when the work is supported on the work support part, and the process liquid is supplied from the process liquid storage part into the work on the work support part via a pump. Pretreatment apparatus for plating, comprising: a treatment liquid supply passage for controlling the treatment liquid; a treatment liquid discharge passage for discharging the treatment liquid from the workpiece; and valves for opening and closing the treatment liquid supply passage and the treatment liquid discharge passage, respectively. . 3. The supply of the processing liquid into the work by opening the processing liquid supply passage and operating the pump, and stopping the supply of the processing liquid when the supply amount of the processing liquid reaches a predetermined amount. The valves and pumps are controlled so that the retention state of the treatment liquid in the work by closing the treatment liquid supply passage and the treatment liquid discharge passage and the discharge of the treatment liquid by opening the treatment liquid discharge passage are sequentially performed. The plating pretreatment apparatus according to claim 2, further comprising: a control unit that energizes the heater when at least the treatment liquid remains in the work.