Press machine and method for adjusting slide position thereof

Patent metadata

Field	Value
Publication number	US-10081150-B2
Application number	US-201214232159-A
Country	US
Kind code	B2
Filing date	Jun 26, 2012
Priority date	Jul 29, 2011
Publication date	Sep 25, 2018
Grant date	Sep 25, 2018

Abstract

A press machine includes a controller including a displacement calculator being adapted to calculate a slide displacement with a slide being kept at a waiting position displaced from a top dead center by an amount corresponding to a predetermined crank angle based on a measured value of a pre-adjustment die height provided for a height adjustment of the slide, a desired value of a post-adjustment die height, the crank angle, a distance between an upper surface of a bolster and a crank center of an eccentric portion, a crank radius of the eccentric portion, and a distance between a lower surface of the slide and a point center, thereby associating the slide displacement with a difference between the pre-adjustment die height and the post-adjustment die height.

First claim

The invention claimed is:

1. A press machine comprising:
a slide;
a bolster located below the slide;
an extendable connecting rod with a lower end that is connected to the slide via a spherical joint without providing a plunger;
a main shaft comprising an eccentric portion to which an upper end of the connecting rod is connected;
a servo motor which drives the main shaft; and
a controller which controls the servo motor,
wherein the controller comprises a displacement calculator configured to:
calculate a pre-adjustment die height based on a measured value of a position of the slide at a top dead center,
calculate a pre-adjustment length of the connecting rod based on the pre-adjustment die height, a distance between an upper surface of the bolster and a crank center of the eccentric portion, a crank radius of the eccentric portion, and a distance between a lower surface of the slide and a point center;
subsequently calculate a post-adjustment length of the connecting rod from the calculated pre-adjustment length of the connecting rod, and a difference between the pre-adjustment die height and a post-adjustment die height obtained as a difference between the pre-adjustment die height and a desired value of the post-adjustment die height; and
calculate a slide displacement with the slide being kept at a waiting position displaced from the top dead center by an amount corresponding to a predetermined crank angle based on the calculated pre-adjustment length of the connecting rod, the calculated post-adjustment length of the connecting rod, the crank radius of the eccentric portion, and the crank angle.

2. The press machine according to claim 1 , wherein the position of the slide at the top dead center is measured when the press machine is powered on.

3. The press machine according to claim 1 , wherein the displacement calculator calculates the slide displacement e according to a formula
e =(C1 2 −r 2 +r 2 cos 2 Θ) 1/2 −(C2 2 −r 2 +r 2 cos 2 Θ) 1/2 ,

where C 1 represents the calculated pre-adjustment length of the connecting rod, C 2 represents the calculated post-adjustment length of the connecting rod, r represents the crank radius of the eccentric portion and Θ represents the crank angle.

4. A slide-position-adjusting method for a press machine comprising:
a slide;
a bolster located below the slide;
an extendable connecting rod with a lower end that is connected to the slide via a spherical joint without providing a plunger;
a main shaft comprising an eccentric portion to which an upper end of the connecting rod is connected;
a servo motor which drives the main shaft; and
a controller which controls the servo motor and performs the method, the method comprising:
calculating a pre-adjustment die height based on a measured value of a position of the slide at a top dead center;
calculating a pre-adjustment length of the connecting rod based on the calculated pre-adjustment die height, a distance between an upper surface of the bolster and a crank center of the eccentric portion, a crank radius of the eccentric portion, and a distance between a lower surface of the slide and a point center;
subsequently calculating a post-adjustment length of the connecting rod from the calculated pre-adjustment length of the connecting rod, and a difference between the pre-adjustment die height and a post-adjustment die height obtained as a difference between the pre-adjustment die height and a desired value of the post-adjustment die height;
calculating a slide displacement with the slide being kept at a waiting position displaced from the top dead center by an amount corresponding to a predetermined crank angle based on the calculated pre-adjustment length of the connecting rod, the calculated post-adjustment length of the connecting rod, the crank radius of the eccentric portion, and the crank angle; and
moving the slide by the calculated slide displacement.

5. The slide-position-adjusting method according to claim 4 , further comprising:
updating the pre-adjustment die height to be the post-adjustment die height after the slide is moved by the calculated slide displacement.

Assignees

• Douba Eiji
• Takeuchi Hisanori
• Kinoshita Hiroshi
• Sato Hirohide
• Komatsu Ind Corp

Inventors

• Douba Eiji
• Takeuchi Hisanori
• Kinoshita Hiroshi
• Sato Hirohide

Classifications

• B30B15/0035

  using an adjustable connection between the press drive means and the press slide · CPC title

• B30B15/148 Primary

  Electrical control arrangements · CPC title

• B30B15/26

  Program-control arrangements · CPC title

• B30B1/26 Primary

  by cams, eccentrics, or cranks · CPC title

• B30B1/263

  work stroke adjustment means · CPC title