JPH04251699A - Controller for accuracy of bottom dead center in pressing machine - Google Patents

Abstract

PURPOSE:To eliminate the need for the adjusting work of adjusting screw for adjusting die height in a pressing machine. CONSTITUTION:The pressing machine adopting a circulating supplying oil type lubricating system is provided with a heating means 7 for heating the circulating oil, a cooling means 8 for cooling the circulating oil and an arithmetic control unit 6 for controlling lubricating oil temp. by controlling the heating means 9 and the cooling means 8 so as to maintain a bottom dead center in the pressing machine to the prescribed position by reading outer informations of the circulating oil temp. etc. By adjusting the circulating oil temp. in the pressing machine, as the bottom dead center can be maintained to the prescribed position, the conventional adjusting work of the adjusting screw is eliminated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a press machine bottom dead center accuracy control device for controlling the bottom dead center accuracy of a slide by controlling the temperature of circulating oil.

0002

2. Description of the Related Art Conventionally, bottom dead center precision control of a press machine has been carried out by an operator manually adjusting a slide adjustment screw and adjusting the die height.

0003

[Problems to be Solved by the Invention] However, this adjustment work requires skill and is one of the causes of reduced production efficiency.

[0004] The present invention has focused on the above-mentioned problems, and its main object is to omit the adjustment work of the slide adjustment screw and to improve production efficiency.

[0005]

[Means for Solving the Problem] In order to solve this problem, the press machine bottom dead center accuracy control device of the present invention provides a heating means for heating circulating oil in a press machine that uses a circulating oil supply type lubrication system. and a cooling means for cooling the circulating oil, and external information such as the temperature of the circulating oil are taken in, and the heating means and the cooling means are controlled to maintain the bottom dead center of the press at a predetermined position to adjust the temperature of the lubricating oil. an arithmetic and control device for controlling;
It is characterized by having the following.

[0006]

[Operations and Effects of the Invention] According to this invention, it is possible to maintain the bottom dead center at a predetermined position by adjusting the circulating oil temperature of the press, and therefore, the conventional adjustment work of the slide adjustment screw is unnecessary. become.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the bottom dead center accuracy control device for a press machine according to the present invention will be described below with reference to the drawings. Note that the press machine to which this embodiment is applied is a press machine that uses a circulating oil supply type as a lubrication type.

(1) Regarding the structure of the bottom dead center precision control device for a press machine FIG. 1 shows the block structure of the entire bottom dead center precision control device for a press machine.

The bottom dead center precision control device of a press machine (not shown) includes a rotation speed setting device 1 into which the set rotation speed of the press machine is inputted by an operator's operation, and a rotation speed setting device 1 installed near the crown of the press machine. An inlet oil temperature sensor 2 that detects the circulating oil temperature at the inlet of the press machine, an outlet oil temperature sensor 3 installed near the bed of the press machine that detects the circulating oil temperature at the outlet of the press machine body, and an outlet oil temperature sensor 3 that detects the column temperature of the press machine. It includes a column temperature sensor 4 and a room temperature sensor 5 that detects the room temperature of the soundproof room.

[0010] Here, the above-mentioned soundproof room is a soundproof room for accommodating a press machine inside the room and preventing noise from propagating to the outside.

The rotation speed setting device 1 and various temperature sensors 2 to 5 are electrically connected to the input side of an arithmetic and control device 6.

On the output side of the arithmetic and control unit 6, there is a heater (heating means) 7 installed near the crown and upstream of the inlet oil temperature sensor 2 to heat the circulating oil, and a heater (heating means) 7 that heats the circulating oil. A fan cooler (cooling means) 8 installed in the circulating oil path leading to the heater 7 for cooling the circulating oil, a soundproof room fan 9 for lowering the room temperature of the soundproof room, and a display 10 are electrically connected. ing.

[0013] Here, the fan cooler 8 has a first
This is a fan/cooler that can change speeds from speed to 4th speed.

[0014] The arithmetic and control unit 6, as described below,
External information is input from the rotation speed setting device 1 and various temperature sensors 2 to 5, and predetermined calculations as described below are performed to send each drive control signal to the heater 7, fan/cooler 8, and soundproof room fan 9. A display signal is output to 10.

The arithmetic and control device 6 performs basic arithmetic control, suppression arithmetic control, fixed room temperature fluctuation arithmetic 106, soundproof room temperature stability control 107, and correction arithmetic of various constants. Below, these various calculations and controls will be explained in order (see FIG. 2).

1) Basic calculation control Basic calculation control consists of preheat control 101 and press operation control 102.

A. Preheat control (103) is executed after the power switch 11 of the arithmetic and control device 6 is turned on (101) and before the start switch 12 of the press machine is turned on (105), and is performed as the first preheat control and the second preheat control. Consisting of

A. The first preheat control determines whether the following condition A is satisfied based on the column temperature signal, room temperature signal, and set rotation speed signal from the column temperature sensor 4, room temperature sensor 5, and rotation speed setting device 1, and when condition A is satisfied, Drive the heater 7.

Condition A: Column temperature < press setting rotation speed/100 x constant A + constant B + fluctuating room temperature Here, before starting the press machine, preheating is performed based on the column temperature etc. on the outside of the column etc. of the press machine. This is because it has been found that sufficient preheating is preferable for the operating characteristics after the press is started, since the parts have characteristics that do not easily warm up.

B. The second preheat control is executed when the heater 7 is heated by the first preheat control, the circulating oil temperature rises, the column temperature rises, and the above condition A is not satisfied, and the outlet oil temperature sensor 3, room temperature sensor 5, Based on the outlet oil temperature signal, room temperature signal, and set rotation speed signal from the rotation speed setting device 1, the success or failure of condition B below is determined, and condition B is set.
When established, the heater 7 is driven.

Condition B: Outlet oil temperature<press setting rotation speed/100×constant C+constant D
+Fluctuating Room Temperature The reason why the second preheating is performed here is because although the influence of outside air inside the press body is small, the amount of heat generated during press operation is large, and this has a large effect on die height.

[0022] H-a. When the heater 7 is heated by the second preheat control, the circulating oil temperature rises, the outlet oil temperature rises, and the above condition B is not satisfied, the outlet from the outlet oil temperature sensor 3, the room temperature sensor 5, and the rotation speed setting device 1 oil temperature signal,
It is determined whether the following condition C is satisfied based on the room temperature signal and the set rotation speed signal, and when the condition C is satisfied, the fan/cooler 8 is driven.

Condition C: Outlet oil temperature > press setting rotation speed/100 x constant E + constant F
+Fluctuating room temperature Ha-b. On the other hand, when the heater 7 is heated by the second preheat control and the above condition B is not satisfied and the above condition C is not satisfied, the display 10 displays that the preheating is completed and it is OK to start the press operation (108).

B. Control during press operation 107 After the above preheat control 103 is completed, the operator turns on the start switch 1.
2 is turned on (105) and the press is in operation, based on the outlet oil temperature signal, set rotation speed signal, and room temperature signal from the outlet oil temperature sensor 3, rotation speed setting device 1, and room temperature sensor 5. The speed of the fan cooler 8 is controlled by determining whether the following conditions D1, D2, D3, and D4 are met.

Condition D1: Outlet oil temperature>press setting rotation speed/100×constant G+constant H
+Fixed room temperature Here, the fixed room temperature is the room temperature of the soundproof room based on the room temperature signal from the room temperature sensor 5 at the time of starting the press, and is a room temperature that can be updated by the fixed room temperature fluctuation calculation 109 described later.

Condition D2: Outlet oil temperature>press setting rotation speed/100×constant G+constant H
+ Fixed room temperature + 0.1 degree Condition D3: Outlet oil temperature > Press setting rotation speed / 100 x constant G + constant H
+ Fixed room temperature + 0.2 degrees Condition D4: Outlet oil temperature > Press setting rotation speed / 100 x constant G + constant H
+ Fixed room temperature + 0.3 degrees a. When only condition D1 is satisfied, the fan/cooler 8 is operated at the first speed.

B. When only condition D2 is satisfied, the fan
The cooler 8 is operated at the second speed. C. When only condition D3 is satisfied, the fan/cooler 8 is operated at the third speed.

d. When only condition D4 is satisfied, the fan
The cooler 8 is operated at the 4th speed. Here, the setting of each of the above conditions and the execution based on the conditions are based on the characteristic data of the press machine obtained in advance in relation to various temperature information related to the press machine, and the expansion and contraction of each part of the press machine is offset. It is specified that the point should be maintained at a predetermined position.

2) Suppression Calculation Control Suppression calculation control consists of press startup suppression control 106, excessive cooling suppression control 108, and rapid cooling control 113 when changing press setting rotation speed.

A. Press startup suppression control 106 After the press starts, the following condition E is calculated based on the set rotation speed signal from the rotation speed setting device 1, and the fan cooler 8 is operated for a certain period of time (unit: minutes), which is the calculation result. It is prohibited to drive in second gear or higher.

Condition E: Press setting rotation speed/142 Note that the numerical value 142 in the above condition E is a constant predetermined according to the model of the press machine.

B. Excess cooling suppression control 108 determines the following conditions F, G, and H based on the inlet oil temperature signal, set rotation speed signal, and room temperature signal from the inlet oil temperature sensor 2, rotation speed setting device 1, and room temperature sensor 5, and Control the speed of cooler 8.

Condition F: Inlet oil temperature<press setting rotation speed/100×constant I+constant J
+ Fixed room temperature condition G: Inlet oil temperature < press setting rotation speed/100 x constant K + constant L
+ Fixed room temperature condition H: Inlet oil temperature < press setting rotation speed/100 x constant M + constant N
+Fixed room temperature a. When only condition F is satisfied, the second speed and higher speeds of the fan/cooler 8 are cut off.

B. When only condition G is satisfied, the third speed and above of the fan/cooler 8 are cut off.

C. When only condition H is satisfied, the fourth speed of the fan/cooler 8 is cut off. C. Rapid cooling control when changing the set rotation speed 113 Based on the set rotation speed signal from the rotation speed setting device 1, it is determined whether the following condition I is met, and when condition I is satisfied and the above condition C is satisfied, 1
The fan cooler 8 is operated in the fourth speed only once.

Condition I: Press setting rotation speed current value > press setting rotation speed new value 3)
Fixed room temperature fluctuation calculation 109 The following condition L is calculated when the following condition J is satisfied, and the following condition M is calculated when the following condition K is satisfied.

Condition J: Fluctuation room temperature - Fixed room temperature = + Room temperature condition K: Fluctuation room temperature - Fixed room temperature = - Room temperature condition L: New fixed room temperature = Current fixed room temperature - | + Room temperature | / (Press setting rotation speed / 100 x constant O + constant P) Condition M: New fixed room temperature = Current fixed room temperature + | - room temperature | / (Press setting rotation speed / 100 x constant O + constant P) 4) Soundproof room temperature stability control 110 After starting the press, when the following condition N is satisfied: , soundproof room fan 9
to drive.

Condition N: Fluctuation room temperature ≧ fixed room temperature + constant Q 5) Correction of various constants Calculation constants A to Q are corrected based on the set rotation speed of the press. Here, the constants A to Q can basically be expressed as a function of the press setting rotation speed as shown in the following equation.

Y=aX2 +bX+c Next, the operation of the arithmetic and control device will be explained with reference to FIG.

■When the power switch 11 is turned on, the preheat control 103 and the press operation control 10 are activated.
7 is created (102).

[0041] Next, the above-mentioned preheat control is executed (103). (2) Next, the above-mentioned display is performed (104).

[0042] Thereafter, when the start switch 12 is turned on (105), the above-mentioned press start-up suppression control 106, press operation control 107, excessive cooling suppression control 108, fixed room temperature fluctuation calculation 109, and soundproof room temperature stability control 110 are executed. Execute.

[0043] Then, after the press machine is stopped (111),
When the rotation speed is set (112), the above-mentioned rapid cooling control 1
13 is executed, and the process moves to the data creation step 102 described above.

[0044] From then on, the above operation is repeated. As explained above, according to the above embodiment, it is possible to maintain the bottom dead center at a predetermined position by adjusting the circulating oil temperature of the press machine, and therefore, the conventional adjustment work of the slide adjustment screw is reduced. becomes unnecessary.

[Brief explanation of the drawing]

[Figure 1] Block configuration diagram of an embodiment of a press machine bottom dead center precision control device

[Figure 2] A schematic flowchart for explaining the operation of the device

[Explanation of symbols]

6 Arithmetic control unit 7 Heater (heating means) 8 Fan cooler (cooling means)

Claims (1)

[Claims] Claim 1: A press machine that uses a circulating oil supply type lubrication system, which includes a heating means for heating the circulating oil, a cooling means for cooling the circulating oil, and external information such as the temperature of the circulating oil,
A bottom dead center precision control device for a press machine, comprising: an arithmetic and control device that controls the heating means and the cooling means to control the lubricating oil temperature.