JPH0337802Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a flaring press for expanding both axial ends of a cylindrical wheel rim material, which is installed in a manufacturing line for vehicle disc wheels. This invention relates to a flaring press equipped with a defective work removal device that is equipped with equipment to automatically remove defective workpieces with welding defects.

[Conventional technology] On a manufacturing line for vehicle disc wheels, a plate material is cut to a certain size, rolled into a cylindrical shape, butt welded at the butt portions, and then sent to a flaring press to widen the ends. The rim is opened, then passed through multiple stages of molding to create a rim shape, the disk is inserted and welded, and the final product is painted.

In a flaring press, a substantially cone-shaped mold is pressed against the inner periphery of a cylindrical rim material from both sides in the axial direction of the workpiece, thereby expanding both ends of the workpiece. When using a flaring press to detect cracks in butt-welded welds during the welding process and eliminate defective products from the rim production line, conventionally, hydraulic pressure was used to press the die against the workpiece. The oil pressure of the cylinder was checked to determine whether the product was defective or not. In other words, if there is a defect in the weld,
Defective products were detected by taking advantage of the fact that the axial force resistance of the workpiece is small and the increase in cylinder oil pressure is small when a mold is pressed against it.

[Problem that the invention aims to solve] However, with the method of checking the hydraulic pressure of the cylinder that drives the mold, the presence or absence of defects in the workpiece does not necessarily correspond accurately to the workpiece's axial load resistance strength, so it is difficult to overlook defective products. In addition, there were cases in which the product was determined to be defective even though there were no welding defects.

An object of the present invention is to provide a flaring press equipped with a defective work removal device that can detect defective products using a method different from conventional methods and can also accurately detect welding defects.

[Means for solving the problem] In order to achieve this objective, the flaring press with defective work removal device of the present invention presses a mold from both sides of a cylindrical workpiece in the axial direction to expand both ends of the workpiece in the axial direction. A pressure switch is provided in the flaring press to be opened, and a communication hole is provided in the mold to communicate the internal space of the workpiece when the mold is pressed against the workpiece to the pressure switch, and a communication hole is provided in the mold to communicate the internal space of the workpiece when the mold is pressed against the workpiece. A path opening/closing device is provided that causes the workpiece to drop downward when opened, and the path opening/closing device is rotated around a fulcrum;
and an air cylinder that drives the path opening/closing means to the open side when the molds are brought close to each other and the pressure switch does not detect a pressure increase.

[Operation] In the above device, the mold is pressed against the workpiece from both ends in the axial direction, and as the ends of the workpiece expand and the distance in the axial direction decreases, the volume of the sealed space inside the workpiece decreases. The pressure rises from atmospheric pressure, but the inside of the workpiece is communicated with the pressure switch through the communication hole, so the pressure switch detects the rise in pressure in the closed space inside the workpiece and closes the path opening/closing means to press the flaring press. The end of the workpiece is expanded and the workpiece is sent to the next process as is. If there is a defect in the welded part of the workpiece, the pressure in the space inside the workpiece during flaring press will escape directly to the atmosphere through the defective part and the pressure will not rise. The path opening/closing means is opened, and the defective products sent out from the flaring press are dropped onto the defective product delivery chute below, and the defective products are removed from the production line.

The above detection detects the pressure in the closed space inside the workpiece, and since the presence or absence of pressure rise corresponds correctly to the presence or absence of defects, the accuracy of defective product detection is improved.
And elimination can be automated.

[Example] Hereinafter, a preferred example of the flaring press with a defective work removal device according to the present invention will be described with reference to the drawings.

FIG. 1 shows the flaring press machine, and FIG. 2 shows the defective product removal device at the subsequent stage.

In FIG. 1, W indicates a cylindrical workpiece having a cylindrical welded portion extending in the axial direction, which can be seen in a cylindrical rim material manufactured in a rim welding process on a vehicle disc wheel manufacturing line. On both sides of the cylindrical workpiece W in the axial direction, molds 1 and 2 are arranged so as to be movable relative to the workpiece W. The molds 1 and 2 are directly fixed to mold mounts 3 and 4 with bolts or the like without using shims. Mold mounting stand 3,
4 is connected to push arms 5, 6 via shafts 19, 20, and the push arms 5, 6 are connected to a drive hydraulic cylinder 9 via link mechanisms 7, 8. Reference numeral 10 denotes a connecting link that interlocks the left and right link mechanisms 7 and 8 in opposite directions. When the hydraulic cylinder 9 is in the position indicated by the solid line, the push arms 5 and 6
By bringing the molds 1 and 2 close to each other, the molds 1 and 2 are pressed against the workpiece W and the ends of the workpiece W are expanded, and when the hydraulic cylinder 9 is in the position indicated by the two-dot chain line in the figure, the push arms 5 and 6 are pressed against the workpiece W. 1 and 2 are separated from each other, and the molds 1 and 2 are separated from the workpiece W. Mold 1,
The approach or separation of the two comrades can be easily detected by providing a limit switch (not shown) in the movement path of the mold mounts 3, 4 or the rod of the hydraulic cylinder 9.

In one of the molds 1 and 2, the mold 1 in the figure is provided with a communication hole 12, and the communication hole 12 is connected to a pressure switch 14 provided at an appropriate location of the device by a hose 13 or the like. It is communicated. The pressure switch 14 detects the increase in pressure in the workpiece interior space S when the workpiece W is sealed by the molds 1 and 2 and deforms.

A path opening/closing means 15 as shown in FIG. 2 is provided on the workpiece conveyance path immediately after the flaring press. The path opening/closing means 15 is rotatable about a fulcrum 16, and when opened allows the workpiece W to drop downward, and when closed allows the workpiece W to pass through to the next process. The path opening/closing means 15 is opened and closed by an air cylinder 17. Below the path opening/closing means 15 is a defective product delivery chute 18 that receives the falling work W and transports it out of the line.
is installed.

A solenoid valve (not shown) that switches the supply of air to the air chambers on both sides of the piston in the air cylinder 17 is provided in the supply path of compressed air to the driving air cylinder 17 of the path opening/closing means 15. A relay interlocked with the limit switch for detecting the approach of the molds 1 and 2 and a relay interlocked with the pressure switch 14 are electrically connected in series to the operating electric circuit of this electromagnetic valve. As a result, when the molds 1 and 2 are brought close to each other and pressed against the workpiece W, and when the pressure in the closed space S within the workpiece does not rise, the solenoid valve is switched to open the path opening/closing means 1. Compressed air is supplied to the air cylinder 17 so as to open it, and conversely, when the pressure rises, the path opening/closing means 15 is closed.

Next, the operation and function of the above device will be explained.

The workpiece W that has been butt-welded in the welding process, deburred, and edge rounded is sent to a flaring press and stopped. The hydraulic cylinder 9 is driven to press the molds 1 and 2 against the workpiece W from both sides in the axial direction via the push arms 5 and 6, and the ends of the workpiece are expanded and flaring pressed.

At this time, the end of the workpiece W is expanded and the axial distance is reduced by the deformation of the flaring, and the volume of the enclosed space S inside the workpiece, which is sealed by the pressing of the molds 1 and 2, is reduced. That's how much the pressure tries to rise from the initial atmospheric pressure.

If there is no defect in the welded part of the workpiece W, pressure will not escape and the pressure in the sealed space S within the workpiece will rise, but if there is a defect in the welded part, air will leak from there and the pressure will not rise.

Since the pressure switch 14 communicates with the closed space S in the workpiece through the communication hole 12, it accurately detects the presence or absence of pressure rise. If there is a pressure increase, that is, if the product is acceptable, the pressure switch 14 closes the path opening/closing means 15 to allow the workpiece W to pass through and be sent to the next process. However, if it is detected that there is no pressure increase, the pressure switch 14 opens the path opening/closing means 15 and drops the workpiece W coming out of the flaring press onto the defective product discharge chute 18 below, and drops it onto the rim manufacturing line. Eliminate defective products from

[Effects of the invention] As explained above, when using the flaring press with the defective work removal device of the present invention, defective product detection is performed by detecting defective products due to the deformation of the workpiece when the molds approach each other and are pressed against the workpiece. The pressure switch detects the pressure rise in the internal space of the workpiece, and opens the path opening/closing means when the pressure does not rise, making it possible to accurately correlate the presence or absence of defects in the workpiece with the presence or absence of pressure rise. , it is possible to accurately detect defective products and eliminate them.
Moreover, since the above-mentioned detection and elimination are all automated, it is possible to save labor in eliminating defective products.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a flaring press with a defective work removal device according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of the main parts of a path opening/closing device provided immediately after the flaring press of FIG. 1. It is. W...work, S...closed space inside the work, 1,
2...Mold, 12...Communication hole, 14...Pressure switch, 15...Route opening/closing means.

Claims (1)

[Scope of utility model registration request] A pressure switch is installed in a flaring press that presses a die from both sides of a cylindrical workpiece in the axial direction to expand both ends of the workpiece in the axial direction. A communication hole communicating with the pressure switch is provided, and a path opening/closing device is provided in the workpiece conveyance path at the latter stage of the flaring press to drop the workpiece downward when the flaring press is opened, and the path opening/closing device is rotated around a fulcrum. A defective workpiece comprising a path opening/closing means, and an air cylinder that drives the path opening/closing means to the open side when the molds are brought close to each other and the pressure switch does not detect a pressure increase. Flaring press with exclusion.