JPS6021124A - Method for controlling load of o press in uoe process - Google Patents

Abstract

PURPOSE:To obtain the optimum load of an O press by detecting the load in the O press, detecting the strength of a material and controlling the O press load by using the calculated value. CONSTITUTION:The information on the load of a U press device 20 in a UOE process is inputted to a control device 10, by which the yield strength is calculated and further the load of an O press is calculated. A pressure control valve 4 is operated in accordance with the calculated load, by which a cylinder 3 is actuated. The actual load in this stage is detected by a load detector 11 and is fed back to the device 10 so that the cylinder 3 is actuated until the set load is attained. The optimum load of the O press is obtd. by such method and the shape defect occurring in the loss load or lack of the load is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a zero press load control method in a UOE process, and an object thereof is to optimize the zero press load.

Figure 1 shows an outline of the KAIS IR type 0 press device. In the figure, (1) and (2) are the upper and lower dies, and zero forming of the U@ plate is performed between these dies (1) and (2).

In the figure, (3) is the cylinder, (4) is the pressure control valve, (
5) is a pressure source. At this time, the load on the O breath is set so that the upper and lower dies (1) and (2) are in close contact with each other.
Since there are variations in the strength of materials, the load is usually set with the aim of reaching the upper limit.

Therefore, if the material strength is low, the upper and lower dies (1)
(2) If no further load is applied after the parts are in close contact, there is a drawback that a loss load will occur in terms of equipment. In addition, if the material strength is high (setting), the pressing ends before the dies (1) and (2) are in close contact with each other, which has the disadvantage that the regular outer diameter cannot be obtained.

In order to improve the above drawbacks, it is necessary to know the strength of each material and set the appropriate pressure for each strength, but the problem here is that in actual production lines, material strength is determined by the tensile strength of the plate. This means that it is not possible to obtain all the numbers through testing.The present invention is removed from the above-mentioned viewpoint, and the load in the O press is detected, the material strength is calculated from this detected value, and the strength of the material is calculated from this calculated value. The basic feature is to control the O press load.

In other words, an analytical relationship has been clarified between the load information at the U press and the yield strength (σy) and tensile strength (σt) of the charged material, and from the load information at the U press, Yield strength (σy) or tensile strength (σt) can be calculated.

If the zero press load is preset based on this σy or σt, an appropriate load setting can be achieved.

FIG. 2 is an explanatory diagram of one embodiment of the method of the present invention, and the same parts as in FIG. 1 are given the same numbers.

In the figure, the handle is the U press device, and the load information from this is input to the control device α1, where the yield strength (σy) is calculated, and from this, the O press load is calculated. The pressure control valve (4) operates according to this calculated load,
Cylinder (3) is activated. The actual load at this time is detected by the load detector α◇ and fed back to the control device (g), and the cylinder (3) operates until the set load is reached.

An example of the calculation formula for yield strength (σy) is Kaiser type U.
The case of a press device is shown below.

As shown in Figure 2, the U-brace device uses a puncher to bend a steel plate (X) into a U-shape, and then presses the saddle (A) with the punch e1. The brake roll (C) has a structure in which both ends of the steel plate (X) (D) are constricted to form a fiU-shape.

In this process, the load is applied to the steel plate (X) as shown in Figure 3.
Is there a peak (PIT) before contact (with the saddle), and a maximum peak CPI after that? ), this load piT can be expressed by the following equation depending on the setting conditions of the U brace and the conditions of the plate.

・・・・・・・・・・・・・・・・・・・・・ ■Here, B: Pipe length (feed) L0 brake roll width (+m) R: Lower punch radius r: Punch lateral radius α ; Angle θ in the range of punch radius R; Brake roll radius t for the bending angle of the steel plate: Plate thickness M: Bending moment of the steel plate Here, M = τσyt1 (σy: yield strength of the steel plate), so this can be expressed as Substituting into the equation 0 and summarizing σy, we get ・・・・・・・・・・・・・・・・・・■.

On the other hand, the zero press load (P) can be expressed by the following formula, depending on the material strength and the shape of the charged steel plate, in the case of the Kaiser type.

P=σy "t" B (0.5m + 0.15
) −”・−”−=■ However, ε: Compression ratio When substituting the above formula 0 into this formula 0, ・・・・・・・・・・・・・・・・・・・・・■ is obtained. It will be done.

If the load PIT in the U press is obtained as described above, the O prene load pt can be calculated from this, and this load P is preset in the O press and pressing is carried out.0 Note that P is the maximum load P in the U press. , 0, which can also be calculated from τ. The results of the method of the present invention are shown in FIGS. 3 to 5.

FIG. 3 shows the measured values and calculated values of the loads P, T, and PtT in the U press, and it can be seen that the calculated values based on the above formula 0 are in good agreement with the measured values.

Figure 4 shows the relationship between the tensile strength calculated using the formula 0 and the measured value, and the agreement is very good. This shows the relationship with the actually required load, and this agreement is also very good.

As explained above, according to the method of the present invention, the optimum load of 0 press can be obtained, so that it is effective in preventing shape defects due to loss load or insufficient load.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of O-press equipment, FIG. 2 is an explanatory diagram of the method of the present invention, and FIGS. 3 to 5 are graphs showing the effects of the present invention. In the figure, θQ indicates a control device, and αυ indicates a load detector. Patent Applicant Nippon gAW Co., Ltd. Inventor: Kodo Hirano, Takashi Sasaki, Haruto Ishihara, Toshiro Ishihara, Patent Attorney A: Shozo Yoshio

Claims (1)

[Claims] It is characterized by detecting the load at U7'L/s, calculating the material strength of the charged steel plate from this load, calculating the optimum load for 0 press based on the material strength, and directly performing υ0 press according to this calculation. 0 press load control method in the UOE process.