JPH0516216U - Ceramic automatic press molding equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To keep the molding thickness and molding weight of a compact constant regardless of variations in the characteristics of ceramic raw materials and variations in temperature and humidity. [Structure] A lower punch is slidably provided in a forming hole of a die table, an upper punch is vertically movable so as to face the forming hole, and a ceramic powder body is filled in the forming hole. In a ceramic press-molding device that lowers the powder body to pressurize the powder body to obtain a molded body, the proximity sensor attached to the press body detects the maximum pressing height of the upper punch to obtain the difference from the reference value. , The upper punch maximum pressure height adjusting motor provided on the press body according to the difference from the reference value corrects the punch to the height of the reference value, and the sampling mechanism for taking out the pressure-formed molded body and the molded body are weighed. Place the weight scale, move the molded body to the weight scale by the sampling mechanism, detect the weight of the molded body to obtain the difference from the reference value, and the die table filling position provided on the press body based on the difference from the reference value. height It is an automatic press molding apparatus for ceramics in which the position of the die table is corrected by an adjusting motor to correct the powder body filling weight to a reference value.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automatic press molding device for ceramics.

[0002]

[Prior Art]

 Conventionally, as shown in FIG. 6, a lower punch 103 is slidably provided in a forming hole 102 of a die table 101, and an upper punch 104 is arranged so as to be vertically movable so as to face the forming hole 102, and a ceramic is formed in the forming hole 102. In the ceramic press molding apparatus in which the powder body P is filled with the powder, and the upper punch 104 is lowered into the molding hole 102 to press the powder body P to obtain a molded body, sampling is performed by an operator during press molding. Is conducted once every two hours to examine the variations in the molding thickness and molding weight of the compact due to variations in the characteristics of the ceramic raw materials and variations in temperature and humidity.

When the variation of the molding thickness or the molding weight of the ceramic molded body exceeds the allowable range, the press is stopped, and the upper punch maximum pressing height adjusting handle H provided in the press body for the variation of the molding thickness. The vertical position of the upper punch 104 is adjusted with _P , and the vertical position of the die table 101 is adjusted with the die table filling position height adjusting handle H _T provided on the press main body for the variation of the molding weight. manually pre scan start until the reference value, pressing, molding thickness and forming the weight check of the molded body, the press stops, it by punching maximum a pressurized adjustment handle H _P-table filling position height adjustment handle H _T The operation cycle of each adjustment was repeated.

[0004]

[Problems to be solved by the device]

 With the conventional method, it is difficult to always obtain the molding thickness and molding weight variation that occur between samplings, and it is difficult to always obtain a molded body with a uniform density, and the dimensions also vary greatly within the lot. That is, when the measurement is performed at intervals of 2 hours, as shown in FIG. 7, it is not possible to confirm even if there is a molded product that is out of the standard between samplings.

Further, it is necessary to stop the press each time the dimension is corrected, and if the adjustment is carried out for a long time, the press operating rate will decrease. There are variations in the sampling of workers, and it is difficult for the workers to perform accurate sampling. As shown in Fig. 8, the values of the thickness and weight of the compact at point A during sampling are mainly If corrected to a value, if the measured value at point A is the upper limit value, it will fall outside the lower limit at point B when time has elapsed, and it will be difficult to grasp the overall trend by measuring at 2 hour intervals.

[0006]

[Means for Solving the Problems]

 In view of the above-mentioned circumstances, the present invention aims to maintain a constant molding thickness and molding weight of a molded body regardless of variations in the characteristics of ceramic raw materials and variations in temperature and humidity. The punch is slidable, the upper punch is arranged so as to be able to move up and down so as to face the forming hole, the ceramic powder body is filled in the forming hole, and the upper punch is lowered into the forming hole to press the powder body. In a ceramic press molding machine that is designed to obtain a compact, the proximity sensor attached to the press body detects the maximum pressing height of the upper punch to find the difference from the reference value, and the difference from the reference value determines the press body. The upper punch maximum pressure height adjustment motor provided in the machine adjusts the upper punch to the height of the reference value, and the sampling mechanism for taking out the pressure-molded compact and the weighing scale for weighing the compact are arranged. The shape is moved to the weighing scale by the sampling mechanism, the weight of the molded body is detected to find the difference from the reference value, and the die table filling position height adjustment motor corrects the die table position based on the difference from the reference value. This is an automatic press molding machine for ceramics, in which the powder filling weight is corrected to a standard value.

[0007]

[Action]

 The proximity sensor detects the maximum pressing height of the upper punch and finds the difference from the reference value.The upper punch maximum height adjustment motor corrects the upper punch to the reference value height based on the difference from the reference value, and molding The body is moved to the weighing scale by the sampling mechanism, the weight of the molded body is detected and the difference from the reference value is obtained, and the die table filling position height adjustment motor corrects the die table position based on the difference from the reference value. Correct the powder filling weight to the standard value.

[0008]

【Example】

 The present invention will be described in detail with reference to specific embodiments shown in the accompanying drawings. As shown in FIG. 1, a lower punch 3 is slidably provided in a forming hole 2 of a die table 1, and an upper punch 4 is vertically arranged so as to face the forming hole 2. The molding hole 2 is filled with the ceramic powder P, and the upper punch 4 is lowered into the molding hole 2 to pressurize the powder P to obtain the molding F as shown in FIG.

In such a ceramic press molding apparatus, as shown in FIG. 3, a proximity sensor 11 for detecting the maximum pressure height of the upper punch 4, that is, the position of the bottom dead center is attached to the press body 12, An amplifier 13 and a converter 14 for amplifying this data are provided and connected to the sequencer 15. The press main body 12 is provided with a punch maximum pressing height adjusting motor 16 for adjusting the maximum pressing height of the punch 4. The thickness of the molded body F is measured by the maximum pressure height of the punch 4, and is measured each time it is processed.

The maximum pressure height of the punch 4 is measured by the proximity sensor 11 at each processing, and when the maximum pressure height is within the range of the upper limit standard and the lower limit standard, without stopping the press machine, By proportionally controlling the difference between the average value of several strokes and the reference value, the upper punch maximum pressing height adjustment motor 16 is controlled by the control signal from the sequencer 15 to set the maximum pressing height of the upper punch 4. Correct to the standard value. If the maximum pressurizing height of the punch 4 suddenly falls outside the range between the upper limit standard and the lower limit standard, it is considered to be abnormal and the press machine is stopped.

On the other hand, the press body 12 is provided with a die table filling position height adjusting motor 21 for adjusting the filling amount of the powder P. A high-precision electronic balance 22 that measures the weight of the formed compact F is arranged, and an automatic sampling device 24 that moves the compact F processed by the press body 12 from the processing location to the high-precision electronic balance 22 is provided. The signal of the sequencer 15 controls the automatic sampling device 24. The data obtained by measuring the compact F with the high-precision electronic balance 22 is supplied to the sequencer 15 via the A / D converter 23.

The weight of the compact F is measured every 500 strokes of the press machine, that is, 500 times of machining. However, since the processing of the thickness of the molded body F is constantly measured, the weight is measured when the thickness fluctuates. If the weight of the compact is within the upper and lower limits, the difference between the average value of several strokes and the reference value is proportionally controlled without stopping the press machine, and the control signal from the sequencer 15 is used. The height adjustment motor 21 of the die table filling position is driven to change the height of the die table 1 to adjust the filling weight of the powder P. If the weight of the compact F suddenly falls outside the range between the upper limit standard and the lower limit standard, it is considered to be abnormal and the press machine is stopped.

FIG. 4 shows conventional actual experimental data of product dimensional accuracy, and FIG. 5 shows actual data according to the present invention. The product is a 40-lead ceramic substrate for semiconductor packages, which has a process capability index C _P = 1.51 in the past, but has a process capability index C _P = 3.42 and C _PK = 0.88, which is the variation with respect to the center value. The result was that C _PK was 2.51 and standard deviation was σ = 0.043, and standard deviation was σ = 0.016, and a high-precision molded body F with a size of ± 0.3% or less was obtained after firing. can get.

Here, the process capability index C _P is expressed as follows. C _P = (S _U −S _L ) / 6σ Here, S _U : upper limit standard S _L : lower limit standard σ: standard deviation Therefore, C _P represents a variation with respect to the standard width.

[0015] C determined for _P criteria C _P <1.0 Capability entirely without 1.0 ≦ C _P <1.33 Capability scarce 1.33 ≦ C _P <1.67 process capability Yes Yes to 1.61 ≦ C process capability sufficiently Further, C _PK central value Shows the variation with respect to.

[0016]

[Effect of the device]

 The present invention is configured as described above, and it becomes possible to perform highly accurate feedback control with respect to fluctuations in raw material characteristics due to fluctuations in raw material lots, thickness of molded products due to changes in temperature and humidity, and variations in weight. In any situation, continuous molding can be performed while keeping the precision constant. Therefore, the dimensional accuracy after firing is extremely high, and the variation can be suppressed to an extremely small level that is uncomparable to the conventional one. In addition, standardization and unmanned operation can be achieved in the press forming process, and since it is not necessary to stop the correction while stopping the conventional press machine, the operating rate is greatly improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a die table and a punched portion in a state where a powder body is filled in an automatic press molding apparatus of the present invention.

FIG. 2 is a vertical cross-sectional view of a die table and a main part of a punch unit in a state where a powder body is pressed by an automatic press molding apparatus of the present invention to form a molded body.

FIG. 3 is a view showing a press operating system of the present invention.

FIG. 4 is a graph showing actual experimental data by a conventional press molding apparatus.

FIG. 5 is a graph showing actual experimental data by the automatic press molding apparatus of the present invention.

FIG. 6 is a vertical cross-sectional view of a main part of a die table and a punch part in a state of being filled with a conventional powder body.

FIG. 7 is a graph showing a change in the thickness of a molded body by a conventional press molding apparatus.

FIG. 8 is a graph showing variations in the thickness of a molded product by a conventional press molding device.

[Explanation of symbols]

1 ... Die table 3 ... Lower punch 2 ... Forming hole P ... Powder body 4 ... Upper punch 12 ... Press body 11 ... Proximity sensor 16 ... Upper punch maximum pressure height adjustment motor 21 ... Die table filling position height adjustment motor 2 ₄ ... Automatic sampling device (example of sampling mechanism) F ... Molded body 22 ... High-precision electronic balance (example of weight scale)

Claims (1)

[Scope of utility model registration request] 1. A lower punch is slidably provided in a forming hole of a die table, an upper punch is arranged to be movable up and down so as to face the forming hole, and a ceramic powder body is filled in the forming hole to form the upper punch. In a ceramic press molding machine that lowers the powder into a hole and pressurizes the powder body to obtain a compact, the proximity sensor attached to the press body detects the maximum pressure height of the upper punch and determines the difference from the reference value. The sampling mechanism and the molded body that take out the pressure-molded compact by correcting the upper punch to the standard height by the upper punch maximum pressure height adjustment motor provided in the press body according to the difference from the standard value. And a weight scale that measures the weight of the molded body are moved to the weight scale by the sampling mechanism, the weight of the molded body is detected, the difference from the reference value is calculated, and the die provided in the press body is determined by the difference from the reference value. Table filling position An automatic ceramic press molding machine that adjusts the position of the die table by a table height adjusting motor to correct the powder body filling weight to a standard value.