JPH055909B2 - - Google Patents

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Field of Application) The present invention relates to a desorption device that automatically masks parts that are not to be anodized during hard alumite treatment. It is used for partial alumite processing, partial plating processing, etc.

(Prior art) Conventional technologies related to the present invention include a method of masking the parts of an engine piston that are not subjected to surface treatment by covering them with a shrinkable adhesive tape, and a method of masking the parts of an engine piston that are not subjected to surface treatment. A method is used in which an O-ring 22 is fitted into the groove 1a and the outer periphery of the O-ring 22 is sealed with a cylindrical member 21.

(Problems to be Solved by the Invention) However, the method of masking with adhesive tape is (1) difficult to automate and requires manual labor, (2) the mask material (adhesive tape) is a consumable item, and ( 3) Since it relies on manual labor, it is difficult to make the parting line straight, and the method of fitting the O-ring into the piston groove 1a and sealing it with the cylindrical object 21 is: (1) It is difficult to automate the attachment and detachment of the O-ring and requires manual labor. (2) It is difficult to prevent liquid leakage between the O-ring and the inner cylinder.

The present invention automatically operates a mask for surface treatment to form an alumite film or a plating film on the exposed part of the mask by surface-treating the workpiece of a grooved cylindrical object such as an engine piston. This is a technical issue.

[Structure of the invention]

(Means for solving the problems) The technical measures taken to solve the above technical problems are as follows. That is, in a detacher for attaching and detaching a mask for surface treatment of a grooved cylindrical workpiece, which has a cylindrical wall that is open at both ends and a lip-shaped protrusion at one end of the cylindrical wall, a plurality of opening and closing operations are performed. The method includes a blade, an opening/closing means for the opening/closing blade, and a means for lifting and lowering the object to be processed, the opening/closing blade is inserted into the inner peripheral part of the cylindrical wall of the mask, and the opening/closing blade is expanded in the radial direction of the mask. This is a mask attachment/detachment device for surface treatment, characterized in that the mask is detached from the object to be treated.

(Operation) The technical means operates as follows. In other words, the opening/closing blade of the mask detacher spreads and holds the rubber mask attached to the outside of the workpiece, and when the workpiece rises from below and stops at a fixed position, the opening/closing blade closes and attaches the mask. The workpiece that has been sent to the next process and has undergone surface treatment is held on the base, and a mask detacher inserts an opening/closing blade between the workpiece and the mask to spread and hold the mask, while the workpiece is lowered. The workpiece and mask can be automatically removed. The removed mask is then attached to a fixed position on the outer periphery of the workpiece that has been raised together with the stand.

In this way, when performing hard alumite treatment only on the tip of the piston, the mask can be attached to a fixed position and removed automatically, accurately and quickly without the need for human intervention. be able to.

(Example) Examples will be described below.

A hollow cylindrical mask 2 made of a rubber material having a lip portion 3 is attached to the cylindrical object having the groove 1a of the engine piston 1 shown in FIG. 1, and the lip portion 3 is engaged with the groove portion 1a. As shown, an alumite film or a plating film is formed only on the portion 5 exposed from the mask 2 by setting the surface treatment liquid 4 on the surface of the alumite liquid or plating liquid and treating the surface.

The rubber mask 2 can be attached and detached from the piston 1, which is a grooved cylindrical object, using a removal device 8, which has six blades 6 as shown in FIG. 3 and has a collection mechanism 7 that opens and closes in the radial direction. 2 is inserted into or removed from the workpiece 1 in a diametrically open state.

If the number of blades is small, when the mask is opened in the diametrical direction, local deformation in the circumferential direction will be large, leading to greater deterioration and sagging of the rubber. Further, if the number of blades is too large, the mechanism of the collet section will become complicated, so the number of blades is preferably about 3 to 8.

The procedure for attaching and detaching a mask, which is an operation in the above structure, will be explained using a mask attaching and detaching device A shown in FIG.

(1) Place the workpiece 1 with the mask on which the surface treatment has been completed on the descending workpiece table 9; (2) use the operation button 10 to turn the workpiece lifting cylinder 11
Activate and raise the workpiece table.

(3) Collet opening/closing cylinder 12 at the top of this device A
, open the mask opening/closing blade 6 between the workpiece 1 and the mask 2, and open the mask 2a.
As shown in the figure, push the lip part apart in the radial direction to separate it from the groove of the workpiece. (4) In this state, lower the workpiece table and remove the mask 2a from the workpiece 1. (5) Place the workpiece whose surface treatment has been completed on this device. Remove the workpiece from A and set the workpiece to be processed on the workpiece table. (6) Raise the workpiece and introduce it into the mask opening/closing blade 6. (7) Close the mask opening/closing blade to contract the mask and remove the workpiece from the lip part 3. (8) Lower the work to complete the mask attachment.

In this way, the rubber mask is automatically attached to and removed from the piston at a specified position.

In the working process, the lip portion 3 of the mask 2
In order to firmly fit the workpiece into the workpiece groove 1a, adjust the device A so that the workpiece groove in the workpiece raised position is 0.2 to 1.5 mm above the lip.

Furthermore, when the mask opening/closing blade 6 is slightly opened to hold the mask and the workpiece is lowered, the lip part fits tightly into the mask groove part.

The mask opening/closing blade 6 has a depth of 0.1 as shown in Figure 4.
~0.5mm uneven processing or knurling processing 13a and 13b perpendicular to the mask sliding direction
is valid.

Regarding the shape of the mask, a rib 14a is provided circumferentially on the lower side of the lip to prevent the lip from bowing downward when the mask is expanded, as shown in 14 in Figure 6A, and a mask opening/closing blade as shown in 15 in B. A protrusion 15a is provided in the circumferential direction on the inner periphery of the mask in order to increase the frictional force between the mask and the inner periphery of the mask, and a shape that allows accurate separation of the surface treatment below the workpiece groove shown in C-16. As shown in 17 of D, in order to reduce the force required to open and close the collection, the center of the inner cylinder of the mask is made thinner as shown in 17a, so that the rubber only contracts and expands around the lip. be.

The rubber material for the mask should be one that has chemical resistance, abrasion resistance, and long elastic life, and chlorinated rubber and fluororesin rubber are suitable.

〔Effect of the invention〕

The present invention has the following effects. In other words, by using this device and mask, it is easy to automate the alumite treatment process, the mask can be used repeatedly, and the lip part of the mask is tightly tightened to the piston groove to ensure that there is no liquid leakage. It is preventable.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the mask of this embodiment attached to a workpiece, Figure 2 is a partially broken sectional view of the mask, Figure 3 is an explanatory diagram of the mask detacher, and Figure 4 A and B are masks. An explanatory diagram of the opening/closing blade, FIG. 5 is an explanatory diagram of a surface treatment mask desorption device that operates with a mask desorption device attached, FIG. 6 A to D are cross-sectional views of other embodiments of the mask, and FIG. FIG. 3 is an explanatory diagram of a conventional method of attaching a mask. 1... Grooved cylindrical workpiece (workpiece), 2...
Mask, 3...Rip, 6...Mask opening/closing blade.

Claims (1)

[Claims] 1. A detacher for attaching and detaching a mask for surface treatment of a grooved cylindrical workpiece, which has a cylindrical wall open at both ends and a lip-shaped protrusion at one end of the cylindrical wall, which has a plurality of opening/closing blades. and an opening/closing means for the opening/closing blade, and a means for lifting and lowering the object to be processed, the opening/closing blade being inserted into the inner circumference of the cylindrical wall of the mask, and expanding the opening/closing blade in the radial direction of the mask. 1. A mask attachment/detachment device for surface treatment, characterized in that the mask is attached/detached to/from the object to be treated.