JP3472316B2 - Press machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press machine capable of requiring an accurate position and load in press working such as caulking and press fitting.

[0002]

2. Description of the Related Art Conventionally, there are two types of basic processing modes described below for precision press-fitting work using an electric press.
First, there is a mode in which the quality of machining is determined by the load range at the ram designated stop position during press-fitting, and second, a mode in which the quality of machining is determined by the ram position range when the designated load value is reached. is there.

[0003]

However, the relationship between the ram position and the load value during machining has a non-linear behavior depending on the shape and material of the workpiece. Therefore, it is difficult to set the judgment range (control items) for non-defective products. Conventionally, a lot of trial processing is performed, data is collected, and the control items (judgment range) are determined in order to apply the experience of experienced persons or statistical processing. ing. For this reason, it is desired that any number of them can easily perform the work of determining the determination range (management item) of non-defective products.

[0004]

Therefore, as a result of earnestly researching in order to solve the above-mentioned problems, the present invention provides the invention with a pressing force generating means for generating a pressing force and a pressing force generating means. Conversion mechanism means for converting linear movement of ram for press, load measuring means for measuring load during pressing, ram position measuring means for measuring ram position, ram position and load value measurement for graph display The measuring range designating means for designating the range to be operated and the storage means for measuring and storing the ram position and the load value in the designated range, and displaying the ram position and the load stored in the storage means as a graph By using the press machine displayed in the means, it is possible to request an accurate position and load in press working such as caulking, press fitting, etc., thus solving the above problems.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will now be described with reference to the drawings. In the press machine of the present invention, as shown in FIGS. The press ram 1 for giving the pressure, the ball screw 2 for raising and lowering the ram 1, and the electric motor 3a as the pressing force generating means 3 are provided in the head frame of the casing 4.

First, regarding the structure of the ram 1, as shown in FIGS. 7 and 8, the ram 1 is formed into a cylindrical body.
Specifically, a hollow portion is formed along the axial direction inside a cylindrical main body 1a formed in a cylindrical shape, and the screw shaft 2a of the ball screw 2 can be inserted into the hollow portion. The nut body 2b of the ball screw 2 is fixed to the end of the tubular body 1a of the ram 1 in the axial direction.

At the bottom of the cylindrical body 1a, a pressing body 1b is provided.
Is configured to be freely attachable, and in reality, the pressing body 1b is in contact with the workpiece W to give an appropriate pressure, and the strain gauge is attached to the pressing body 1b. In some cases, the strain gauge can detect the pressure applied to the workpiece W.

A cylindrical guide 5 is provided so as to enclose the outer peripheral side surface of the cylindrical main body 1a. The tubular guide 5
Is fixed in the casing 4, and the ram 1 is configured to be movable up and down along the tubular guide 5. The rum 1
Is provided with a steady rest guide 6 so as not to rotate on the plane orthogonal to the axial direction. Specifically, as shown in FIGS. 7 and 8, the steady rest guide 6 comprises a steady rest rod 6a, a guide portion 6b and a connecting plate 6c, and the steady rest rod 6a is located above the lower end portion of the ram 1. It is provided via a connecting plate 6c so as to be parallel to the ram 1 and parallel to the ram 1, and its steadying rod 6a moves in the vertical direction as the ram 1 moves up and down.

Further, a guide portion 6b for allowing the steady rod 6a to pass through a predetermined portion is fixed in the casing 4,
The steady rod 6a is raised and lowered along the guide portion 6b so that the ram 1 does not idle in the tubular guide 5 when moving vertically. .

The conversion mechanism means A for converting the rotational force generated by the pressurizing force generating means 3 into the linear movement of the ram 1 for pressing by the screw mechanism is the ball screw 2, the screw shaft 2a, the nut body 2b, the tubular guide. It is composed of 5 etc.

The press condition input means 7 is for inputting the press condition, and the information inputted from the keyboard as the press condition input means 7 is transferred to the central processing unit 19.

The display means 8 is composed of a display device for displaying the press condition input information and the press result information, and displays the information transferred from the central processing unit 19. Specifically, it is provided as having a liquid crystal display function.

The press operating means 9 operates the press. Specifically, the operation is performed as the operation of the press or the input condition is selectively operated.

The printing means 10 is a means for printing the information displayed on the display means 8, or the display means 8
The press input information and the press result information can be directly printed without using the display.

The press condition storage means 11 is a memory for storing the press sequence program data set for each work, and the actual press operation is performed according to the stored contents.

The pressing force generation control means 12 controls the pressing force generation means 3 based on information from the central processing unit 19. Further, the information such as the pressing force and the position from the pressing force generating means 3 is transferred to the central processing unit 19.

The pressing force generating means 3 performs a pressing operation based on information from the central processing unit 19. Further, information on the pressing force, position, etc. at that time is applied to the pressing force generation control means 1
Transfer to 2.

The load measuring means 13 measures the load at the time of pressing, and the ram position measuring means 14 are respectively provided so as to measure the ram position. The measuring range designating means 15 determines the ram position for each elapsed time. It is configured so that the range in which the load value is measured can be designated as appropriate.

Position, elapsed time, load value temporary storage means 16
Is a memory that measures the position, elapsed time, and load value in the specified range and temporarily stores them in time series after the start of pressing.

The graph display means 17 is configured to selectively graphically display the temporally stored position and load, and the elapsed time and load, which are temporarily stored. Further, an elapsed time measuring means 18 for measuring the elapsed time is also provided.

The central processing unit (CPU) 19 is
The ram initial position, the corresponding height setting point of the ram 1, the switching point from high speed to low speed, the set pressurizing force generation point, and the fixed position stop point are stored, and the ram 1 has reached each of these positions. And has a function of instructing the electric motor 3a to change the setting of the rotation speed and the current value, and to intermittently and reverse.

Next, the operation will be described. First, the present press machine has two basic processing modes of fixed position stop and constant load stop. In both cases, operation is set (teaching) in the press before operation.

In the processing mode of fixed position stop, the quality of the processing is judged based on the position at the time of pressing and the load value at that time. In the setting, the corresponding height setting position, pressurizing position, stop position,
The pressing speed, pressing time, etc. are set for each workpiece W.

On the other hand, the constant load stop processing mode is a processing operation in which the quality is judged by whether the set load value is settled within a predetermined range (position).

Since the basic operation of the graph display is the same for both processing modes, an example of constant load stop will be described here with reference to the flowcharts of FIGS. When the ram 1 is driven by the pressing force generation means 3 and the pressing force generation control means 12 during setting or operation and enters the range instructed by the measurement range designating means 15, the central processing unit 19 starts control.

The pressurizing force generation means 3 is driven through the pressurizing force generation control means 12, and the position of the ram 1 is at a predetermined measurement range specifying position (Ln to Lm) by the position signal from the measurement range specifying means 15. In that case, as shown in FIG.
The position (Lx) of the ram 1, the elapsed time (Tx) from the start of measurement at that time, and the load value (Px) are measured and stored in the position, elapsed time, and load value temporary storage means 16. The graph of FIG. 3 is a data capture table for Lx, Tx, and Px in the flowchart of FIG.

After the measurement is completed, the position and the load value, the elapsed time and the load value are selected by a selection switch (not shown). The flowchart of FIG. 4 shows the state when the position and load value are selected and displayed.

The minimum display unit (a) of the ram position, the minimum elapsed time unit (b), and the load value are calculated from the display densities of the X and Y axes (maximum dot of x axis: Dx, maximum dot of y axis: Dy) in the arithmetic unit. The minimum unit (c) is calculated, and the index indicating the position, the elapsed time, and the place where the temporarily stored value of the load value temporary storage means 16 is stored is initialized. Then, the values of the position and the load value stored according to the index value are read out and output to the display means 8 by the central processing unit 19.
Repeat this operation until the last value in the specified range.

Next, the operation will be briefly described. The position of the ram 1 within the range determined during the setting or trial operation and the load value at that time are temporarily stored in time series. The stored contents are displayed as a graph of the ram position and the load and the elapsed time and the load value according to the display instruction. Therefore, the dynamic behavior of the position and the load value, the elapsed time and the load value can be visually observed, and the place where the management item should be adopted can be immediately determined.

5 and 6 show display examples. Figure 5
[Fig. 4] is a graph of ram positions and load values when pressurization is started from L1 and stopped at L4 in a processing mode of constant load stop. FIG. 6 is a graph of the elapsed time from the start of pressurization and the load value. From t1 to t4, the workpiece W is securely fixed by press-fitting, caulking, etc., so that the processing when staying at that position for a certain time is performed. Is shown.

When a constant load is applied to the workpiece W as shown in the above figure, when the machining is stopped to perform the machining, the load value of p1 is used as the stop position condition, and the pass / fail judgment range of the ram position is L2.
It becomes possible to judge that it should be set to L3.

The fact that the load value fluctuates in the section from t3 to t4 in FIG. 6 indicates that the load W vibrates due to the repulsive force of the workpiece W.

[0033]

According to the first aspect of the present invention, the pressing force generating means 3 for generating the pressing force and the converting mechanism means A for converting the pressing force generating means 3 into the linear motion of the ram 1 for press.
A load measuring means 13 for measuring a load during pressing, a ram position measuring means 14 for measuring a ram position, and a measurement range specifying means 15 for specifying a ram position and a range for measuring a load value for displaying a graph. A press machine comprising a storage means for measuring and storing a ram position and a load value in a designated range, and displaying the ram position and the load stored in the storage means as a graph on the display means 17. Due to
Firstly, the ambiguity due to experience can be grasped as visual data. Secondly, it is possible to omit the work of performing many trial processing and statistical processing when changing the workpiece W, and thirdly, press-fitting and caulking processing. It is possible to prevent erroneous determination due to erroneous data caused by vibration of the workpiece W at the time, and fourthly, to easily analyze the cause of the defective product from the graph. As described above, while confirming the state displayed on the display means (states of FIG. 5 and FIG. 6), it is possible to select an accurate position and load in press working such as press fitting, and easily determine a non-defective product. A range (management item) can be set.

According to the second aspect of the present invention, a pressing force generating means 3 for generating a pressing force, a converting mechanism means A for converting the pressing force generating means 3 into a linear motion of the ram 1 for pressing,
A load measuring means 13 for measuring a load during pressing, a ram position measuring means 14 for measuring a ram position, a measurement range specifying means 15 for specifying a range for measuring a ram position and a load value for displaying a graph, A storage means for measuring the ram position, the elapsed time, and the load value in the specified range and storing the elapsed time, the ram position, and the load value, and a display means 17 for displaying the elapsed time and the load stored in the storage means as a graph 17 The use of the press machine shown in Fig. 2 has the advantage that the dynamic behavior of the elapsed time and the load of the ram can be visually observed, and it is possible to immediately determine where to take the control item.

[0035]

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention.

FIG. 2 is a partial flowchart for setting the present invention.

FIG. 3 is a table included in the partial flowchart of FIG.

FIG. 4 is a partial flowchart for setting the present invention.

FIG. 5 is a position / load relationship graph of one embodiment displayed on the display means of the present invention.

FIG. 6 is a graph showing a relation between elapsed time and load of one embodiment displayed on the display means of the present invention.

FIG. 7 is a sectional view of the present invention.

FIG. 8 is a perspective view of the present invention.

[Explanation of symbols]

1 ... Ram 3 ... Pressurizing force generating means A ... Conversion mechanism means 13 ... Load measuring means 14 ... Ram position measuring means 15 ... Measuring range designating means 16 ... Position, elapsed time, load value temporary storage means 17 ... Graph display means 19 ... Central processing unit

─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A 2-160127 (JP, A) JP-A 2-155556 (JP, A) JP-A 63-194901 (JP, A) Actual development Sho-59- 31039 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B30B 15/00

Claims (2)

(57) [Claims] 1. A pressing force generating means for generating a pressing force,
A conversion mechanism means for converting the pressing force generating means into a linear motion of a ram for pressing, a load measuring means for measuring a load at the time of pressing, a ram position measuring means for measuring a ram position, and a ram for displaying a graph. A measuring range designating means for designating a range for measuring the position and the load value, and a storage means for measuring and storing the ram position and the load value in the designated range, and the ram position stored in the storing means. A press machine characterized by displaying load and a graph on a display means. 2. A pressing force generating means for generating a pressing force,
A conversion mechanism means for converting the pressing force generating means into a linear motion of a ram for pressing, a load measuring means for measuring a load at the time of pressing, a ram position measuring means for measuring a ram position, and a ram for displaying a graph. A measuring range designating unit for designating a position and a range for measuring a load value; a storage unit for measuring a ram position, an elapsed time and a load value in the designated range and storing the elapsed time, the ram position and the load value; A press machine characterized in that the elapsed time and the load stored in the storage means are displayed on the display means as a graph.