PRESS MACHINE BRAKING PERFORMANCE VERIFYING APPARATUS

• US 20140200711A1
• Filed: 02/18/2013
• Published: 07/17/2014
• Est. Priority Date: 03/15/2012
• Status: Active Grant

• Current Assignee: Komatsu Industries Corporation (Komatsu)
• Original Assignee: Komatsu Industries Corporation (Komatsu)
• Inventors: Douba, Eiji, Takeuchi, Hisanori, Takada, Masaaki, Sakurai, Hitoshi
• Granted Patent: US 9,423,313 B2
• Time in Patent Office: Days
• US Class Current: 700/206
• CPC Class Codes: B30B 12/00 Presses not provided for in groups B30B1/00 - B30B11/00
• CPC Class Codes: B30B 15/148 Electrical control arrangements
• CPC Class Codes: G01L 5/284 Measuring braking-time or braking distance

Abstract

A press machine braking performance verifying apparatus verifies performance of brakes applying braking to a slide. The press machine braking performance verifying apparatus includes a speed detecting component, a stopping instruction detecting component, a stopping time measuring component, a maximum stopping time calculating component and an evaluating component. The speed detecting component detects a slide driving speed. The stopping instruction detecting component detects if stopping of the slide is instructed. The stopping time measuring component measures a stopping time until the slide stops when a stopping instruction is detected. The maximum stopping time calculating component calculates predicted stopping time in a case where the slide is driven at a maximum driving speed based on the slide driving speed after detecting the stopping instruction and the stopping time. The evaluating component evaluates performance of the brakes by comparing the predicted stopping time and a threshold valve set in advance.

Claims

1. A press machine braking performance verifying apparatus for verifying performance of brakes which apply braking to a slide, the press machine braking performance verifying apparatus comprising:

a speed detecting component configured to detect a slide driving speed at which the slide is driven;

a stopping instruction detecting component configured to detect if stopping of the slide is instructed;

a stopping time measuring component configured to measure a stopping time until the slide stops when a stopping instruction is detected;

a maximum stopping time calculating component configured to calculate predicted stopping time in a case where the slide is driven at a maximum driving speed based on the slide driving speed after detecting the stopping instruction and the stopping time; and

an evaluating component configured to evaluate performance of the brakes by comparing the predicted stopping time and a threshold valve set in advance.

2. The press machine braking performance verifying apparatus according to claim 1, further comprising:

an execution limiting component configured to operate the stopping time measuring component, the maximum stopping time calculating component, and the evaluating component only in a case where the slide driving speed when the stopping instruction is detected is a predetermined speed or more.

3. The press machine braking performance verifying apparatus according to claim 1, wherein

the stopping time measured by the stopping time measuring component a sum of

idle time from detecting of a stopping instruction to a start of braking and

braking time from the start of braking to stopping of the slide, and the maximum stopping time calculating component

determines a deceleration coefficient from the slide driving speed at a predetermined timing during the braking time and a time from the predetermined timing to stopping of the slide and

calculates the predicted stopping time from a fixed stopping time,

where the time from the start of braking to the predetermined timing is added to the idle time, the maximum driving speed of the slide, and the deceleration coefficient.

4. The press machine braking performance verifying apparatus according to claim 3, wherein

the fixed stopping time is a fixed value which is set in advance.

5. The press machine braking performance verifying apparatus according to claim 3, further comprising:

a speed change detecting component configured to detect a change in the slide driving speed and to determine whether the change in the slide driving speed exceeds a predetermined threshold value; and

a fixed stopping time calculating component configured to calculate the time from the timing when the stopping instruction is detected to the timing when the change in the slide driving speed exceeds the predetermined threshold value as the fixed stopping time.

6. The press machine braking performance verifying apparatus according to claim 1, further comprising:

a movement direction detecting component configured to detect a movement direction of the slide, wherein

the stopping time measuring component, the maximum stopping time calculating component and the evaluating component are operated only when a stopping instruction is detected when the slide is being lowered.

7. The press machine braking performance verifying apparatus according to claim 1, wherein

the evaluating component has

a warning value, which is set in advance and

an abnormal value, which is a value which is larger than the warning value, and

the evaluating component

provides a notification of a warning in a case where the predicted stopping time is equal to or more than the warning value and is less than the abnormal value and

prohibits activation of the press machine in a case where the predicted stopping time is the abnormal value or more.

8. The press machine braking performance verifying apparatus according to claim 1, further comprising:

a signaling component configured

to determine whether or not a predetermined period of time has passed since an evaluation was carried out by the evaluating component and

to signal a warning such that the braking performance verifying apparatus is operated in a case where an evaluation has not been performed by the evaluating component after the predetermined period of time has passed.

9. The press machine braking performance verifying apparatus according to claim 7, further comprising:

an operating component configured to execute a braking performance verifying test; and

a test permitting component configured to permit an activation in order to verify braking performance in a case where the operating component is operated even in a case where activation of the press machine is prohibited by the evaluating component.

10. The press machine braking performance verifying apparatus according to claim 9, further comprising:

an acceptance determining component configured to determine whether or not a result of verifying of braking performance by the operating component and the test permitting component satisfies a predetermined standard; and

a cancelling component configured to cancel prohibiting of activation of the press machine by the evaluating component in a case where it is determined that braking performance satisfies the predetermined standard by the acceptance determining component.