JP4694193B2 - Method and apparatus for manufacturing powder molded product - Google Patents

Description

  The present invention relates to a method for manufacturing a powder molded product and a manufacturing apparatus.

Conventionally, a powder molding apparatus compresses a powder material filled in a mold with an upper punch and a lower punch to form a molded product. At this time, since the filling amount of the powder material filled in the mold is controlled by the filling height (lift amount), that is, the volume in the mold, the weight of the molded product tends to vary. For this reason, a sample is extracted from the determined number of molded products, the weight is measured, and if a molded product that does not conform to the standard is detected, the result is fed back to the filling amount of the powder material and Adjustments are made to obtain a suitable molded product. (For example, see Patent Document 1)
Japanese Utility Model Laid-Open No. 5-16216

  However, the method of measuring and determining the weight can accurately check the accuracy of the molded product, but it takes time until the sample is weighed after placing the sample on the balance. Then, there was a problem that the productivity deteriorated.

  On the other hand, for example, in the case where one sample is weighed and managed for production with respect to 20 molded products, there is a problem that the production accuracy is reduced.

  An object of this invention is to provide the manufacturing method and manufacturing apparatus of a powder molded product which can aim at the improvement of productivity, maintaining the same precision as the case where all the weights are measured in view of the said situation.

  In order to achieve the above object, the present invention provides the following means.

The invention according to claim 1 is a method of manufacturing a powder molded product using a mold installed in a mechanical press, and the pressure of the press is detected during molding to ensure that the molded product is It is determined whether or not it is within a limited pressurization range set in advance so as to be a non-defective product, and when it is determined that the product is out of the limited pressurization range, the weight of the molded product is measured, and the weight is the specified weight. It is determined whether or not it is within the range, the molded product determined to be within the limited pressure range or the specified weight range is regarded as a non-defective product, and the molded product determined to be outside the specified weight range is defined as a defective product And

  That is, in the case of a mechanical press, since the press is performed to a certain height, the pressure acting on the punch and the weight of the powder in the mold are almost proportional. Therefore, by using the pressing force detected at the time of molding, a limited pressurizing range that is surely regarded as a non-defective product in weighing determination is set in advance, and a molded product molded with the pressurizing force within this limited pressurizing range. Is a good product at that time, and the weight of only the molded product molded with the pressure outside the limited pressure range can be measured to select the good product and defective product of all the molded products.

 According to a second aspect of the present invention, in the method for manufacturing a powder molded product according to the first aspect, a second pressure range that is larger than the limited pressure range is set, and the pressure during molding is the second pressure force. If it is determined to be out of the range, it is a defective product.

  In the method of manufacturing a powder molded product according to the present invention, in addition to the limited pressure range that is definitely regarded as a non-defective product, when a pressure outside that range is detected, the second pressure that is reliably defective is detected. By setting the pressure range, it is possible to select a molded product that is definitely a good product and a molded product that is definitely a defective product by detecting the pressure applied during molding. Further, it is possible to perform selection of non-defective products and defective products of all molded products by measuring the weight only for molded products that are formed outside the limited pressure range and with a pressure within the second pressure range.

 According to a third aspect of the present invention, in the method for manufacturing a powder molded product according to the first aspect, when it is determined that the powder is out of the specified weight range, the filling height of the powder material into the mold is feedback controlled. It is characterized by.

  In the method of manufacturing a powder molded product according to the present invention, a defective product is specified by being out of the specified weight range, and when a defective product is generated, the filling height is feedback-controlled, so that a constant weight molding is performed. The product can be formed continuously.

 According to a fourth aspect of the present invention, in the method for manufacturing a powder molded product according to the second aspect, when it is determined that the powder is out of the specified weight range or out of the second pressure range, the powder material into the mold The filling height is feedback-controlled.

  In the method of manufacturing a powder molded product according to the present invention, if a defective product is specified by being out of the specified weight range or the second pressure range, and the defective product is generated, the filling height is feedback controlled. Therefore, a molded article having a constant weight can be continuously formed.

The invention according to claim 5 is an apparatus for producing a powder molded product using a mold installed in a mechanical press, wherein pressure detecting means for detecting a pressing force of the press at the time of molding, and the pressing force is a molding Pressure determining means for determining whether or not the product is within a limited pressurization range set in advance so as to ensure that the product is a non-defective product, and when it is determined that the product is out of the limited pressurization range, the weight of the molded product is measured Weight measuring means; weight determining means for determining whether or not the weight is within a specified weight range; and defective product discharge for discharging a molded product determined to be out of the specified weight range by the weight determining means as a defective product Means.

  In the powder molded product manufacturing apparatus according to the present invention, the pressure detection means detects the applied pressure at the time of molding, and the pressure determining means determines whether or not the detected applied pressure is within the limited applied pressure range, A molded product determined to be within the limited pressure range can be selected as a non-defective product. In addition, the molded product determined to be out of the limited pressure range is measured by the weight measuring unit, and the weight determining unit determines whether the weight is within the specified range, and is determined to be out of the specified weight range. The molded product can be selected as a defective product. Furthermore, the molded product determined as a defective product can be eliminated by the defective product discharging means. In this case, the weight can be measured only for the molded product determined to be out of the limited pressure range by the pressure determining means, and the non-defective product and the defective product can be selected.

 According to a sixth aspect of the present invention, in the powder molded product manufacturing apparatus according to the fifth aspect of the present invention, a second judgment is made as to whether or not the pressure during molding is within a second pressure range that is greater than the limited pressure range. Pressure determining means is provided, and the defective product discharging means is further configured to discharge a molded product determined to be out of the second pressure range by the second pressure determining means.

  In the apparatus for manufacturing a powder molded product according to the present invention, it is determined whether or not the pressing force at the time of molding detected by the pressure detecting means is within the second pressing force range by the second pressing force determining means. The molded product determined to be out of the 2 pressure range can be selected as a defective product. In addition, the molded product that is determined to be defective by the second pressure determining unit can be removed by the defective product discharging unit. In this case, it is possible to measure the quality of only the molded products that are outside the limited pressure range and within the second pressure range, and to select non-defective products and defective products for all molded products.

 According to a seventh aspect of the present invention, in the powder molded product manufacturing apparatus according to the fifth aspect, based on the weight of the molded product determined to be out of the specified weight range by the weight determining means or the applied pressure at the time of molding, It has a feedback control means for feedback control of the filling height of the powder material into the mold.

  In the powder molded product manufacturing apparatus according to the present invention, a defective product that falls outside the specified weight range is specified by the weight determination unit, and when a defective product is generated, the filling height is feedback controlled by the feedback control unit. Therefore, a molded product having a constant weight can be continuously formed.

 The invention according to claim 8 is the powder molded product manufacturing apparatus according to claim 6, wherein the weight determination unit or the second pressure determination unit determines that the weight is out of the specified weight range or out of the second pressure range. It is characterized by having feedback control means for feedback controlling the filling height of the powder material into the mold based on the weight of the molded product and the applied pressure at the time of molding.

  In the powder molded product manufacturing apparatus according to the present invention, a defective product that is outside the two ranges of the specified weight range or the second pressure range is specified by the weight determination unit or the second pressure determination unit, and a defective product is generated. In this case, since the filling height is feedback-controlled by the feedback control means, a molded product having a constant weight can be continuously formed.

  According to the first aspect of the invention, the pressurizing force detected at the time of molding is used to set in advance a limited pressurizing range that is surely regarded as a non-defective product even in the weighing determination. Molded products molded under pressure should be good products at that time, and only molded products molded with pressure outside the limited pressure range should be weighed to select all molded products. Therefore, productivity can be improved while maintaining the same accuracy as when all the weights are measured.

  According to the second aspect of the invention, in addition to the limited pressurizing range that is surely regarded as a non-defective product, the second pressurizing range that is reliably defective when a pressurizing force outside that range is detected. It is possible to select a molded product that is definitely a good product and a molded product that is definitely a defective product by setting and detecting the pressure applied during molding. In addition, since it is possible to select all non-defective products and defective products by measuring the weight only for molded products molded outside the limited pressure range and with a pressure within the second pressure range. Further, productivity can be improved while maintaining the same accuracy as when all the weights are measured.

  According to the invention according to claim 3, when a defective product is specified by being out of the specified weight range, and a defective product is generated, the filling height is feedback-controlled, so that a molded product having a constant weight is continuously fed. Therefore, the production accuracy and productivity can be improved.

  According to the fourth aspect of the present invention, when a defective product is specified by being out of the specified weight range or the second pressure range, and the defective product is generated, the filling height is feedback-controlled. Thus, a molded product having a constant weight can be continuously formed, and production accuracy and productivity can be improved.

  According to the fifth aspect of the present invention, the pressure detection means detects the pressing force during molding, the pressure determination means determines whether or not the detected pressing force is within the limited pressing force range, and the limited pressing force is determined. A molded product determined to be within the range can be selected as a non-defective product. In addition, the molded product determined to be out of the limited pressure range is measured by the weight measuring unit, and the weight determining unit determines whether the weight is within the specified range, and is determined to be out of the specified weight range. The molded product can be selected as a defective product. Furthermore, the molded product determined as a defective product can be eliminated by the defective product discharging means. In this case, since the weight can be measured only for the molded product determined to be out of the limited pressure range by the pressure determining means and all the molded products can be selected as good and defective, the total weight was measured. Productivity can be improved while maintaining the same accuracy as the case.

  According to the invention which concerns on Claim 6, it determines whether the applied pressure at the time of shaping | molding detected by the pressure detection means is in a 2nd applied pressure range by a 2nd applied pressure determination means, and 2nd applied pressure A molded product determined to be out of the range can be selected as a defective product. In addition, the molded product that is determined to be defective by the second pressure determining unit can be removed by the defective product discharging unit. In this case, when the weight of all molded products can be selected by measuring the weight only for the molded products that are outside the limited pressure range and within the second pressure range, the total weight measurement is possible. As a result, productivity can be improved while maintaining the same accuracy.

  According to the seventh aspect of the present invention, when a defective product that is out of the specified weight range is specified by the weight determination means and a defective product is generated, the filling height is feedback-controlled by the feedback control means. A heavy molded product can be continuously formed, and production accuracy and productivity can be improved.

  According to the invention according to claim 8, when a defective product that is out of the two ranges of the specified weight range or the second pressure range is specified by the weight determination unit or the second pressure determination unit, and a defective product is generated. Since the filling height is feedback-controlled by the feedback control means, a molded product having a constant weight can be continuously formed, and the production accuracy and productivity can be improved.

  Hereinafter, with reference to FIGS. 1-4, the manufacturing method and manufacturing apparatus of the powder molded product which concern on one Embodiment of this invention are demonstrated.

  One embodiment of the present invention relates to a powder molding apparatus that molds a powder molded product using a mold installed in a mechanical press (crank press in the illustrated example) T.

  As shown in FIGS. 1 to 2, the powder molding apparatus 1 is fixed to a support table 2 to form a filling portion 3, and is provided above the die 4 so as to be able to advance and retreat toward the filling portion 3. A supported upper punch 5, a lower punch 6 that is attached to the filling portion 3 so as to be movable relative to the filling portion 3 and defines the filling portion 3 together with the die 4, and a feeder cup 7 that slides on the upper surface of the die 4. It is composed of In this configuration, the die 4, the upper punch 5, and the lower punch 6 are combined into a mold 8. Further, the support table 2, the mold 8 and the feeder cup 7 surrounded by a two-dot broken line in FIG. 1 serve as the powder molding unit 9 shown in FIG. 2.

  The support table 2 is fixed to the yoke plate 2b by a rod 2a, and the yoke plate 2b is fixed to a lower ram 2c that moves the yoke plate 2b up and down. Further, the support table 2 is continuously provided with a weight measuring means 10 for measuring the weight of the molded product conveyed by appropriate means, and the weight measuring means 10 has a weight determining means 11 for determining the measured weight. A defective product discharging unit 12 is provided which is connected and discharges a molded product determined to be defective by the weight determining unit 11.

  The upper punch 5 is fixed to the upper punch plate 5b by an upper punch presser 5a, and the upper punch plate 5b is fixed to an upper ram 5c that moves the upper punch plate 5b up and down. Further, the upper punch plate 5b is provided with pressure detection means 13 for detecting the pressure applied by the upper punch 5 to the powder material P during molding, and the pressure detection means 13 includes a pressure for determining the detected pressure. The determination means 14 and the second applied pressure determination means 15 are connected.

  The lower punch 6 is fixed to the lower punch plate 6a, and the lower punch plate 6a is fixed to the bolster 6b. Further, the lower punch plate 6a is connected to a feedback control means 16 that feedback-controls the results of the pressure judgment means 14, the second pressure judgment means 15 and the weight judgment means 11, and the filling height H (in the mold 8) A filling height adjusting means 17 for adjusting the lift amount) is provided.

  The feeder cup 7 is formed in a box shape having an open bottom surface, and is slidably disposed on the top surface 2d of the support plate 2 connected to a driving means of a press. Further, a flexible supply pipe 7b is connected to the upper wall portion 7a of the feeder cup 7, and an end portion 7c of the supply pipe 7b facing the feeder cup 7 has a powder material inside the feeder cup 7. A hopper 7d for supplying P is provided.

 Next, a method for manufacturing a powder molded product of the powder molding apparatus 1 having the above-described configuration will be described.

  With the upper punch 5 raised and away from the die 4, the feeder cup 7 is disposed so as to be positioned on the upper surface side of the filling portion 3. At this time, the support table 2 and the lower punch 6 are in a state where the upper surface 2d of the support table 2 and the upper surface 6c of the lower punch 6 coincide with each other because the support table 2 is displaced downward by the lower ram 2c.

  Next, the yoke plate 2b is displaced upward by the lower ram 2c, and the support table 2 is positioned upward. When the support table 2 is displaced upward, the lower punch 6 is positioned relatively below, and the filling portion 3 is defined. Further, the displacement amount of the support table 2 is adjusted to be a predetermined filling height H (lift amount).

  The filling unit 3 is defined, and the powder material P in the feeder cup 7 positioned on the upper surface side of the filling unit 3 is dropped and supplied to the filling unit 3. When the filling is completed, the feeder cup 7 is moved backward while sliding on the support table 2 from the upper surface side of the filling portion 3. At this time, the upper surface of the supplied powder material P is slid so as to coincide with the upper surface 2d of the support table 2 by the side wall portion 7e of the feeder cup 7 that comes into contact with the support table 2, thereby being supplied to the filling unit 3. The powder material P can be made into a predetermined filling amount.

  Next, the upper punch 5 is lowered to a certain height while being fitted to the die 4, and the powder material P is compressed and hardened by the lower punch 6 and the upper punch 5 to form a molded product. At this time, the pressure detection means 13 detects the pressure applied when the upper punch 5 is lowered to a certain height and compresses the powder material P. The detected pressure is used by the pressure determination means 14 and the second pressure determination means 15 described later in detail for determining the molded product.

 Thereafter, the upper punch 5 is raised, the support table 2 is displaced downward, and the molded product is extracted from the filling portion 3 by the lower punch 6. The extracted molded articles are sequentially conveyed to the weight measuring means 10 by appropriate means. At this time, the molded product determined to be non-defective by the pressure determining means 14 and the molded product determined to be defective by the second pressure determining means 15 are passed on the weight measuring means 10 as they are. The weight of the product is measured by the weight measuring means 10. The weight measured by the weight measuring means 10 is judged by a weight judging means 11 described later for details.

 Of the molded products that have passed through the weight measuring unit 10, the molded products that are determined to be defective by the second pressure determining unit 15 and the weight determining unit 11 are discharged by the next defective product discharging unit 12.

 Here, the pressure and weight at the time of molding of the molded product determined to be defective by the pressure determining unit 14, the second pressure determining unit 15 and the weight determining unit 11 are fed back to the filling height adjusting unit 17 by the feedback control unit 16. Then, the filling height H (lift amount) in the mold 8 is adjusted so that a good product is molded.

  Such a molding cycle is repeated, and a plurality of molded products are continuously molded.

  Here, with reference to FIG. 3, the determination method of the non-defective product of the molded product by the pressure determination means 14, the 2nd pressure determination means 15, and the weight determination means 11 is demonstrated.

  In the condition setting (S201) shown in FIG. 3, a specified weight range obtained by adding an allowable error to the design weight of the molded product is determined, and then the pressure range during molding in which a molded product within the specified weight range is reliably obtained is set. Set as the limited pressure range. In addition, a molded product molded with a pressure outside the pressure range is set with a second pressure range that is surely outside the specified weight range. After these conditions are set, the molded product is molded by the powder molding apparatus 1, and the pressure applied during molding is measured for each molded product by the pressure detection means 13 (S202).

  Next, in the molded product, it is determined by the pressure determination means 14 whether or not the pressing force during molding is within the limited pressing force range (S203). If the applied pressure is within the limited applied pressure range, the molded products are aligned as good products at that time (S204). If the applied pressure is outside the limited applied pressure range, the second applied pressure is determined by the second pressure determining means 15. It is determined whether it is within the range (S205). If it is out of the second pressure range, it is discharged as a defective product by the defective product discharging means 12 at that time (S209). If it is within the second pressure range, the molded product may be either a good product or a defective product, so the weight is measured by the weight measuring means 10 (S206), and the weight is measured by the weight determining means 11 within the specified weight range. It is determined whether it is within (S207). If the weight is within the specified weight range, the molded product is aligned as a non-defective product (S204), and if it is outside the specified weight range, it is discharged as a defective product by the defective product discharging means 12 (S207).

  Here, when a molded product determined as a defective product is detected, the weight of the defective product and the pressing force at the time of molding are fed back to the condition setting (S201) by the feedback control unit 16, and based on this result, the powder material , That is, the filling height H (lift amount) is adjusted, and thereafter, the defective product is adjusted so as not to be molded (S208).

 Next, a setting example of the limited pressure range and the second pressure range will be described with reference to FIG.

 FIG. 4 shows the weight of the molded product and the applied pressure at the time of molding when a plurality of molded products are continuously molded using the powder molding apparatus 1. Here, the vertical axis represents the pressing force during molding, and the horizontal axis represents the weight. The molded product shown in FIG. 4 is a cube having a width of 7 mm, a height of 11 mm, and a depth of 7 mm. The design weight is 1.970 g, and a weight error of ± 0.01 g is allowable with respect to the design weight. Has been.

 The range delimited by the broken line indicating the weight from 1.960 g to 1.980 g on the horizontal axis is the specified weight range for determining the molded product as a non-defective product, and the range of the pressing force delimited by the solid line on the vertical axis is surely molded. The limited pressure range is determined so that the product is determined to be non-defective. Moreover, the range of the pressurizing force delimited by the one-dot broken line on the vertical axis is a second pressurizing range in which a molded product outside this range is reliably determined as a defective product.

  Each area indicated by A to F, which is divided by various lines, indicates a classification of a non-defective product and a defective product.

  Region A indicates a region in which the molded product is molded with a pressure within the limited pressure range and is reliably determined as a good product. A region C indicates a region where the pressing force at the time of molding is within the limited pressing force range but is outside the specified weight range, and the molded product is determined to be defective.

  Here, the limited pressure range is a pressure within the limited pressure range, based on the weight and pressure of several previously molded products or products of the same standard produced in the past. It is set to ensure that the molded product is a good product. At this time, the molded product molded with the pressurizing force in the limited pressurizing range is always set to correspond to the region A. This is due to the fact that the weight of the molded product and the applied pressure are in a substantially proportional relationship, and all of the molded products molded with the pressure in the limited applied pressure range due to the proportional relationship between the weight and the applied pressure. It becomes possible to make it correspond to. Therefore, since the limited pressure range can be set so that the molded product molded in the limited pressure range always corresponds to the region A, there is no molded product corresponding to the region C.

  In regions B and D, molded products are molded with the pressure in the second pressure range, and molded products excluding molded products that are definitely judged as good in region A, that is, good and defective molded products. The mixed area is shown. The molded products corresponding to the regions B and D are the objects of weight measurement, the molded product determined to be non-defective by weight measurement corresponds to the region B, and the molded product determined to be defective corresponds to the region D. It becomes. Regions E and F indicate regions in which the molded product is molded in a range of pressure greater than the second pressure range, and is reliably out of the specified weight range and determined as a defective product.

 Here, the second pressurizing force range is based on the weight and pressurizing force of some previously molded products or products of the same standard produced in the past, as in the setting of the limited pressurizing force range. In addition, it is set so that a molded product molded outside this range is surely defective. At this time, a molded product molded with a pressure outside the second pressure range is always set to correspond to the region E. This is also due to the fact that the weight of the molded product and the pressing force are in a substantially proportional relationship, and all the molded products molded with a pressing force outside the second pressing force range by this proportional relationship between the weight and the pressing force. It becomes possible to make it correspond to E. Therefore, since the second pressure range can be set so that the molded product molded outside the second pressure range always corresponds to the region E, there is no molded product corresponding to the region F.

  Therefore, in the manufacturing method of the above-mentioned powder molded product, a limited pressurizing range that is surely regarded as a non-defective product in the weighing determination is set in advance using the pressurizing force detected at the time of molding. Molded products molded with a pressure within the range can be selected as good products at that time, and all molded products can be measured by measuring the weight only for molded products molded with a pressure outside the limited pressure range. It is possible to sort non-defective and defective products.

  Moreover, in addition to the limited pressure range that is surely regarded as a non-defective product, when a pressure outside the range is detected, a second pressure range that is reliably regarded as a defective product is set. By detecting the pressure, it is possible to select a molded product that is definitely a good product and a molded product that is definitely a defective product.

  Furthermore, by measuring the weight only for molded products that are molded outside the limited pressure range and with a pressure within the second pressure range, it is possible to select non-defective products and defective products for all molded products. it can.

  Furthermore, if a defective product is identified by being out of the specified weight range or the second pressure range, and if a defective product is generated, the filling height is feedback-controlled. Therefore, the production accuracy and productivity can be improved.

  Therefore, according to the above method for producing a powder molded product, productivity can be improved while maintaining the same accuracy as when the total number of molded products are measured.

  Further, in the above powder molded product manufacturing apparatus, the pressure detection means detects the applied pressure at the time of molding, and the pressure determination means determines whether or not the detected applied pressure is within the limited applied pressure range, A molded product determined to be within the limited pressure range can be selected as a non-defective product.

  Further, the molded article determined to be out of the limited pressure range is measured by the weight measuring unit, and the weight determining unit determines whether the weight is within the specified range, and is determined to be out of the specified weight range. The molded product can be selected as a defective product, and the molded product determined as a defective product can be eliminated by the defective product discharging means.

  In this case, the weight can be measured only for the molded product determined to be out of the limited pressure range by the pressure determining means, and the non-defective product and the defective product can be selected.

 Furthermore, when a defective product outside the specified weight range or the second pressure range is specified by the weight determination unit or the second pressure determination unit, and a defective product is generated, the filling height is fed back by the feedback control unit. Since it is controlled, a molded product having a constant weight can be continuously formed, and production accuracy and productivity can be improved.

 Therefore, according to the above-described powder molded product manufacturing apparatus, productivity can be improved while maintaining the same accuracy as when all the weights of the molded products are measured.

It is the schematic of the manufacturing apparatus of the powder molded product which concerns on one Embodiment of this invention. It is the schematic of the powder shaping | molding part shown in FIG. It is a flowchart which shows the determination method of the quality goods of the molded product which concerns on one Embodiment of this invention, and a defective product. It is a figure which shows the example of a setting of the limited pressurization range shown as one Embodiment of the manufacturing method of the powder molded product of this invention, and a 2nd pressurization range.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Powder shaping | molding apparatus 2 Support table 3 Filling part 4 Die 5 Upper punch 6 Lower punch 7 Feeder cup 8 Mold 10 Weight measuring means 11 Weight judging means 12 Defective product discharging means 13 Pressure detecting means 14 Pressure judging means 15 Second pressure judging Means 16 Feedback control means 17 Filling height adjusting means H Filling height (lift amount)
P powder material

Claims (8)

A method for producing a powder molded product using a mold installed in a mechanical press,
The pressurizing force of the press is detected at the time of molding, and it is determined whether the pressurizing force is within a limited pressurizing range set in advance so that the molded product is surely good. If it is determined, the weight of the molded product is measured to determine whether the weight is within the specified weight range, and the molded product determined to be within the limited pressure range or the specified weight range is determined to be a non-defective product. A method for producing a powder molded product, wherein a molded product determined to be out of a specified weight range is regarded as a defective product. In the manufacturing method of the powder molded product of Claim 1,
A powder characterized in that a second pressure range larger than the limited pressure range is set, and a defective product is determined when it is determined that the pressure during molding is outside the second pressure range. Manufacturing method of molded products. In the manufacturing method of the powder molded product of Claim 1,
A method for producing a powder molded product, comprising feedback-controlling a filling height of the powder material into the mold when it is determined that the weight is out of the specified weight range. In the manufacturing method of the powder molded product of Claim 2,
A method for producing a powder molded product, wherein feedback control is performed on the filling height of the powder material into the mold when it is determined that the weight is outside the specified weight range or the second pressure range. An apparatus for producing a powder molded product using a mold installed in a mechanical press,
Pressure detecting means for detecting the pressing force of the press at the time of molding, and pressure determining means for determining whether the pressing force is within a limited pressurizing range set in advance so as to ensure that the molded product is a non-defective product ; A weight measuring means for measuring the weight of the molded article when determined to be outside the limited pressure range, a weight determining means for determining whether the weight is within a specified weight range, and the weight determining means. An apparatus for producing a powder molded product, comprising: a defective product discharging means for discharging a molded product determined to be out of the specified weight range as a defective product. In the apparatus for manufacturing a powder molded product according to claim 5,
A second pressure determining means for determining whether or not a pressing force during molding is within a second pressing force range that is larger than the limited pressing force range; and the defective product discharging means further includes the second pressure determining means. The apparatus for producing a powder molded product, characterized in that the molded product determined to be outside the second pressure range is also discharged. In the apparatus for manufacturing a powder molded product according to claim 5,
Feedback control means for feedback-controlling the filling height of the powder material into the mold based on the weight of the molded product determined to be out of the specified weight range by the weight determination means or the applied pressure at the time of molding; An apparatus for producing a powder molded product. In the apparatus for manufacturing a powder molded product according to claim 6,
Powder in the mold based on the weight of the molded product determined to be out of the specified weight range or out of the second pressurizing range by the weight determining unit and the second pressure determining unit or the pressing force at the time of molding An apparatus for producing a powder molded product, comprising feedback control means for feedback controlling the filling height of the material.

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