JP2007302979A - Apparatus for depositing phosphate-coating film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for depositing a phosphate coating film and a method for depositing a phosphate-coating film capable of easily and reliably performing the phosphate coating on a metallic intermediate component, and reducing the inventory of works in process. <P>SOLUTION: The apparatus for depositing a phosphate coating film comprises: a closed loop transfer chain arranged to pass over each processing tank while hanging metallic intermediate components at a plurality of parts in a predetermined pitch; a driving means capable of performing the intermittent action of stopping for a predetermined time after performing the one-pitch feed action of feeding the transfer chain by the predetermined pitch; a vertically moving means for vertically moving the transfer chain interlockingly with the action of the driving means; and a control means capable of adjusting the processing time per cycle to be performed in each processing tank during one pitch feed. The method for depositing a phosphate-coating film uses the apparatus for depositing a phosphate coating film. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a phosphate film forming apparatus and a phosphate film forming method capable of simply and reliably performing a phosphate film treatment.

As a chemical conversion treatment, it is known to perform a phosphate coating treatment (also referred to as a bonder treatment) that forms a phosphate coating on the surface of a metal material (Non-Patent Document 1). This is because the phosphate coating formed on the surface of the metal material has a lubricating effect such as preventing seizure between the mold and the metal material during processing of the metal material.
For example, when manufacturing parts such as a shaft for automobile steering, spline processing is performed after the drawing process. However, since the processing is severe in the spline processing, seizure is likely to occur. Therefore, it is necessary to perform a bond process on the metal intermediate part (also referred to as a workpiece) after drawing. At that time, a large number of workpieces were collected and collectively subjected to a bond treatment in which the workpieces were sequentially immersed in various treatment tanks containing a phosphate treatment solution.
Metal Handbook, Revision 6: The Japan Institute of Metals, 2000, Maruzen Co., Ltd., p870

When such a bond processing is performed, in the next process, since the workpieces are splined one by one, there is a problem that a large number of intermediate parts are held as work-in-process inventory.
The present invention eliminates the above-mentioned problems of the prior art, allows phosphate coating treatment to be easily and reliably performed on metal intermediate parts, and reduces the inventory of work in progress. An object of the present invention is to provide a phosphate film forming apparatus and a phosphate film forming method.

The present inventor has intensively studied and arranged a closed-loop transfer chain for suspending a workpiece so as to pass above each treatment tank, and when performing treatment in a treatment tank filled with at least a phosphate treatment solution, the treatment is performed. The present invention has been made on the knowledge that the above problems can be solved by sequentially immersing the workpieces in different places in the tank.
The present invention is as follows.

  1. A phosphate film forming apparatus for performing a phosphate film treatment, in a state where metal intermediate parts are suspended at a predetermined pitch at a plurality of locations, and the transfer of a closed loop arranged so as to pass above each treatment tank And a drive means capable of intermittent operation after a one-pitch feed operation for feeding the transfer chain by a predetermined pitch and then stopping for a predetermined time, and moving the transfer chain up and down in conjunction with the operation of the drive means. A phosphate film forming apparatus comprising: a vertically moving means for moving; and a control means capable of adjusting a processing time per cycle performed in each processing tank during one pitch feed.

2. A hanging hanger capable of attaching one metal intermediate part for each one pitch feed of the transfer chain is provided. The phosphate film forming apparatus described in 1.
3. 1. One pitch feed of the transfer chain is detected by a proximity switch and a hanger dog of a hanging hanger as a detected member that turns on the proximity switch. Or 2. The phosphate film forming apparatus described in 1.

4). The drive unit is a gear motor. Or 2. The phosphate film forming apparatus described in 1.
5). The above-mentioned 1., wherein the vertical movement means is an air cylinder. Or 2. The phosphate film forming apparatus described in 1.
6). Above 1. ~ 5. When performing the phosphate film treatment using the phosphate film forming apparatus according to any one of the above, first, the treatment time per cycle performed in each treatment tank during one pitch feed is set, and then the workpiece Attach the metal intermediate part to the transfer chain in the desorption zone, turn on the start switch, perform processing per cycle in each processing tank during one pitch feed of the transfer chain, and then the same cycle The method for forming a phosphate film, characterized by repeating the above.

  According to the phosphate film forming apparatus and the phosphate film forming method using the same according to the present invention, the treatment time per cycle and the number of cycles in the treatment tank filled with the phosphate treatment solution (number of treatments) ), The phosphate coating formation time can be set, and the phosphate coating treatment can be easily and reliably performed on the metal intermediate part. At that time, the number of intermediate metal parts corresponding to the processing in the next processing step is suspended on the transfer chain via the suspension hanger, thereby reducing the inventory of work in progress.

Hereinafter, the case where the present invention is applied to an automobile steering shaft component will be described.
FIG. 1 is a plan view showing a configuration example of a phosphate film forming apparatus, and FIG. 2 is a front view of the apparatus of FIG. FIG. 3 is a side view showing a main part of the apparatus of FIG.
In this embodiment, in order to form a phosphate film on the surface of the shaft intermediate part (hereinafter also referred to as a workpiece W) after the drawing, the workpiece W is placed on the transfer chain 1 in the workpiece detachment zone 3C. Each is suspended through a hanging hanger 4. The pitch p of 1 pitch at which the hanging hanger 4 is attached to the transfer chain 1 is the same.

  The feeding direction of the transfer chain 1 is a counterclockwise direction as viewed in FIG. 1, and the workpiece W is processed in each processing tank in the order of 2A to 2G. 2A is a degreasing tank filled with an alkaline degreasing liquid, and 2B is a liquid draining tank for cutting the degreasing liquid. 2C and 2D are warm washing tanks filled with warm water for washing away the degreasing solution, and 2E is a liquid draining tank for cutting off the warm water. A treatment tank 2F filled with a phosphating solution is disposed on the downstream side in the transfer direction of the liquid draining tank 2E, and a liquid draining tank 2G for cutting the phosphating solution is disposed on the downstream side. . Thereafter, the workpiece W is processed in the hot air drying zone 3A and the natural drying zone 3B, and then goes around the closed loop and returns to the original workpiece detachment zone 3C.

In this case, a gear motor 6 is used as a driving means capable of an intermittent operation of stopping for a predetermined time after performing a one-pitch feed operation for feeding the transfer chain 1 by a predetermined pitch p, and a vertical movement for moving the transfer chain 1 up and down. As a means, an air cylinder 7 was used.
The phosphate film forming apparatus according to this embodiment is arranged so as to pass above each of the treatment tanks 2A to 2G in a state where the workpiece W is suspended at a predetermined pitch p at a plurality of locations of the transfer chain 1. A closed loop transfer chain 1, a gear motor 6 as a driving means capable of intermittent operation that stops for a predetermined time after performing a one-pitch feed operation for feeding the transfer chain 1 by a predetermined pitch p, and interlocking with the operation of the gear motor 6 Per cylinder in the treatment tank 2F filled with the phosphating solution between the air cylinder 7 that moves the transfer chain 1 up and down and the time after the next one-pitch feed until the next one-pitch feed is performed. And a control means 8 capable of adjusting the processing time.

  The control means 8 is, for example, a controller incorporating a sequencer or timer for controlling the entire apparatus, and the operation of the air cylinder 7, the operation of the gear motor 6, and the like so as to have a processing time per cycle set in the timer. It has a function to control the temperature of the processing tank. The controller 8 that controls the entire apparatus is provided with a start switch (not shown). When the start switch is turned on, a series of operations (one cycle operation) associated with one pitch feed is performed.

  Among the treatment tanks 2A to 2G described above, in the treatment tank 2F filled with at least the phosphate treatment solution, the work can be sequentially immersed in different places for every one pitch feed of the transfer chain 1. Yes. In order to reliably form a phosphate coating having a lubricating effect on the surface of the workpiece W, it is important to sequentially immerse at least in different places in the treatment tank 2F for each pitch feed. The length in the transfer direction of the treatment tank 2F filled with the solution is set to be twice or more the interval p of 1 pitch.

The transfer chain 1 forms a closed loop between the gear motor 6 of the driving means and the gear 9 for the chain, and the gear motor 6 and the chain gear 9 are attached to the support plate, and the air cylinder is passed through this support plate. It is supported so that it can move up and down.
Here, for each pitch feed of the transfer chain 1, the phosphate film forming apparatus provided with the hanging hanger 4 capable of attaching one workpiece W is a simple and reliable transfer of the workpiece W. This is preferable because it can be suspended from the chain 1.

  Further, as shown in FIG. 3, one pitch feed of the transfer chain is detected by a proximity switch 5 and a hanger dog of a hanging hanger 4 as a member to be detected that turns on the proximity switch 5. It is preferable to use the phosphate coating film forming apparatus because it is possible to detect one pitch feed of the transfer chain with a simple configuration. Still further, the phosphate film forming apparatus having the gear motor 6 as the driving means and the air cylinder 7 as the vertical movement means has a simple configuration, and the workpieces W are placed at a predetermined pitch p at a plurality of locations on the transfer chain 1. In the suspended state, it is preferable because it can be moved up and down in conjunction with one pitch feeding.

The bond processing method using the phosphate film forming apparatus according to the embodiment described above is as follows.
First, the processing time per cycle performed in each processing tank during one pitch feeding is set as a termer. Next, the workpiece W is attached to the transfer chain in the workpiece attachment / detachment zone, the start switch is turned on, and processing per cycle is performed in each processing tank during one pitch feed of the transfer chain. repeat. FIG. 4 shows an operation flow of the phosphate film forming apparatus at that time.

  FIG. 5 shows that by applying the present invention, which can easily and reliably perform bondage processing, to a manufacturing process of a shaft component for an automobile steering, it is possible to reduce the inventory of work-in-process products on which a phosphate coating is formed. It was.

In the phosphate film forming apparatus shown in FIGS. 1 to 3, the workpiece W was bonded using a solution of the main component phosphate film treating agent as shown in Table 1. Next, spline processing was performed to manufacture automobile steering shaft parts.
The treatment time per cycle was set to 30 seconds, and the number of cycles (number of treatments) in each treatment tank and treatment zone is shown in Table 2.

  As a result, it was possible to prevent seizure between the tool and the metal intermediate part after drawing with the phosphate coating during spline processing, while reducing the inventory of work-in-process products that had undergone bond processing.

It is a top view which shows the structural example of the phosphate film formation apparatus concerning this invention. It is a front view of the phosphate film formation apparatus of FIG. It is a side view which shows the principal part of the phosphate film formation apparatus of FIG. It is a flowchart of operation | movement of the phosphate film formation apparatus of FIG. It is process drawing which compares and shows the manufacturing process (a) after this invention application, and (b) before this invention application.

Explanation of symbols

W Metal intermediate parts (work)
DESCRIPTION OF SYMBOLS 1 Transfer chain 2A-2G Processing tank 3A-3C Processing zone 4 Hanging hanger 4A Hanger dog (detected member)
5 Proximity switch 6 Gear motor (drive means)
7 Air cylinder (vertical movement means)
8 Controller (control means)
9 Chain gear

Claims (6)

  A phosphate film forming apparatus for performing a phosphate film treatment, in a state where metal intermediate parts are suspended at a predetermined pitch at a plurality of locations, and the transfer of a closed loop arranged so as to pass above each treatment tank And a drive means capable of intermittent operation after a one-pitch feed operation for feeding the transfer chain by a predetermined pitch and then stopping for a predetermined time, and moving the transfer chain up and down in conjunction with the operation of the drive means. A phosphate film forming apparatus comprising: a vertically moving means for moving; and a control means capable of adjusting a processing time per cycle performed in each processing tank during one pitch feed.   2. The phosphate film forming apparatus according to claim 1, further comprising a hanging hanger capable of attaching one metal intermediate part for each one-pitch feed of the transfer chain.   The one-pitch feed of the transfer chain is configured to be detected by a proximity switch and a hanger dog of a hanging hanger as a detected member that turns on the proximity switch. 2. The phosphate film forming apparatus according to 2.   The phosphate film forming apparatus according to claim 1, wherein the driving unit is a gear motor.   The phosphate film forming apparatus according to claim 1, wherein the vertical movement means is an air cylinder.   When performing the phosphate coating process using the phosphate coating forming apparatus according to any one of claims 1 to 5, first, a processing time per cycle performed in each processing tank during one pitch feeding is set. Then, the metal intermediate part is attached to the transfer chain in the workpiece attachment / detachment zone, the start switch is turned on, and processing per cycle is performed in each processing tank during one pitch feed of the transfer chain. Thereafter, the same cycle is repeated, and the method for forming a phosphate film is characterized in that it is repeated.