JP2012071357A - Powder molding press machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder molding press machine capable of obtaining a molding, which is higher in working precision than a conventional one and is uniform in density.SOLUTION: The powder molding press machine, where respectively one or more upper and lower punches are put side by side between a die and a core rod, and press molding is performed, includes: an upper punch set provided with an upper punch plate fitted with the upper punch and a connection rod connected to the plate; a lower punch set provided with a lower punch plate fitted with the lower punch and a connection rod connected to the plate; an upper barrel-shaped cylinder arranged below an upper plate 103 in the shape of a concentric circle with the central axis of the core rod as the center and connected to the connection rod of the upper punch set; and a lower barrel-shaped cylinder arranged above a base plate 3 in the shape of a concentric circle with the central axis of the core rod as the center and connected to the connection rod of the lower punch set. By subjecting the upper and lower barrel-shaped cylinders to liquid pressure driving, the upper and lower punches are operated, and pressurization can be performed from the upper and lower parts.

Description

  The present invention relates to a powder molding press machine for producing a molded product such as a powder sintered part by pressure molding using a die and a punch.

  In recent years, as the demand for high precision and near net shape for molded products has increased, servo controlled fluid pressure (gas pressure, liquid pressure) cylinders for die and punch positions that determine the thickness (height) of molded products There is an increasing demand for powder forming press machines that are controlled by using. This fluid pressure cylinder is a pressure receiving cylinder that supports the load applied to the punch during pressing. When a multi-stage molded product is manufactured using a plurality of punches, the load applied to each punch differs according to the shape of the molded product. Therefore, a cylinder is required for each punch. Therefore, as the shape of the molded product becomes complicated and the number of punches increases, the number of corresponding cylinders also increases. An increase in the number of pressure-receiving cylinders leads to an increase in the size of the powder molding press machine, resulting in a demand for a pressure-receiving capability that is greater than the molding capability. In general, in the case of lower three-stage molding, one die is used for the outermost shell, three punches, and one core rod are used, and the total pressure receiving capability that the pressure receiving cylinder mechanism can withstand is 1 of the molding capability. .5 to 2 times is required.

  As such a powder forming press machine, Patent Document 1 discloses a structure in which pressure receiving cylinders corresponding to a plurality of punches are coaxially arranged in series. Since the powder molding press machine disclosed in Patent Document 1 has a structure in which pressure-receiving cylinders are coaxially stacked in series, the total height is very high. Therefore, since the transmission distance of the load load transmitted to each component in the axial direction varies, each component is bent or buckled differently, and when assembling the press machine, the deflection or buckling element, etc. It must be calculated in detail.

  Therefore, a powder molding press machine described in Patent Document 2 has been proposed mainly for the purpose of downsizing a pressure receiving cylinder mechanism that satisfies the pressure receiving capability of multistage molding and reducing the size of the powder molding press machine. The powder molding press machine described in Patent Document 2 is a powder molding press machine in which a core rod is arranged in the center with a die as an outermost shell, and one or more punches are arranged between the die and the core rod to perform press molding. Has the following configuration. A die set comprising a die plate for attaching a die and a connecting rod connected to the die plate, and one or more punch sets comprising a punch plate for attaching a punch and a connecting rod connected to the punch plate A central cylinder connected to the core rod and one or more cylindrical cylinders surrounding the central cylinder are disposed on the base plate, and the cylindrical cylinder and at least the connecting rod of the punch set are connected to each other, The center cylinder and the cylindrical cylinder are driven by pressure.

  This powder press machine has a structure in which a pressure receiving cylinder is formed in a cylindrical shape, and the diameter is different for each cylindrical cylinder corresponding to a punch to be reciprocated to surround a central cylinder. By concentrating multiple cylinders that had been separately provided until then, concentrating them at the same location, the pressure-receiving cylinder mechanism can be gathered low without being stacked in the height direction and downsized in the width direction. Is done. Further, from the structure in which the cylindrical pressure receiving cylinder is concentrated in the center, the load can be concentrated in the center by providing the cylinder in a one-to-one relationship with the pressure receiving punch. We have been able to provide press machines with excellent capabilities and well-balanced.

Japanese Patent Publication No. 07-115233 Japanese Patent Laid-Open No. 2005-29662

  The powder molding press machine described in Patent Document 2 is a mechanism in which pressure is applied by the upper punch and pressure is received by the lower punch, and the innermost lower punch among the plurality of lower punches forming the mold serves as a press position reference. During this pressing, it is known that a side pressure of a downward component is applied from the upper punch to the die (and core rod), so that the position of the die also changes (see Patent Document 2, paragraphs 0045 to 0046, FIGS. 5 and 6). This side pressure affects the processing accuracy of the molded product, complicating the position control of the lower punch in the conventional powder molding press machine. In addition, since there is a mechanism in which pressure is applied by the upper punch and pressure is received by the lower punch, there is an improvement in that an imbalance of density can occur inside the molded product.

  The present invention has been made in view of such a technical background, and proposes a powder molding press machine capable of obtaining a molded product with higher processing accuracy and uniform density.

  In order to solve the above problems, the powder forming press machine proposed here is a powder forming press machine in which a die is used as an outermost shell and one or more upper and lower punches are arranged in the die to perform press forming.

The first aspect of the powder molding press machine is:
One or more upper punch sets including an upper punch plate for attaching the upper punch and a connecting rod connected to the upper punch plate;
One or more lower punch sets including a lower punch plate to which the lower punch is attached and a connecting rod connected to the lower punch plate;
One or more upper cylindrical cylinders arranged concentrically around the central axis of the upper punch and disposed below the upper plate and connected to the connecting rod of the upper punch set;
A plurality of lower cylindrical cylinders concentrically centered about the central axis of the lower punch, disposed on the base plate, and connected to the connecting rod of the lower punch set;
Comprising
The lower punch set is disposed inside a plurality of pillars erected on the base plate, and the upper plate is slidably attached to the pillars up and down.
An upper cylinder is provided on the upper frame fixed to the support column, and the upper cylinder is connected to the upper plate via a pressure-resistant link mechanism,
The pressure-resistant link mechanism extends as the upper plate is lowered by the upper cylinder, and the position of the upper plate is maintained during molding by the extending pressure-resistant link mechanism,
The upper and lower cylindrical cylinders can be pressurized from above and below by operating the upper and lower punches by fluid pressure driving.

The second aspect of the powder press machine is as follows:
One or more upper punch sets including an upper punch plate for attaching the upper punch and a connecting rod connected to the upper punch plate;
One or more lower punch sets including a lower punch plate to which the lower punch is attached and a connecting rod connected to the lower punch plate;
A die set having a die plate for attaching the die and a connecting rod connected to the die plate;
One or more upper cylindrical cylinders arranged concentrically around the central axis of the upper punch and disposed below the upper plate and connected to the connecting rod of the upper punch set;
A plurality of lower cylindrical cylinders arranged concentrically around the central axis of the lower punch and disposed on the base plate, connected to the connecting rod of the lower punch set and the connecting rod of the die set;
Comprising
The lower punch set and the die set are disposed inside a plurality of support columns erected on the base plate, and the upper plate is slidably attached to the support columns.
An upper cylinder is provided on the upper frame fixed to the support column, and the upper cylinder is connected to the upper plate via a pressure-resistant link mechanism,
The pressure-resistant link mechanism extends as the upper plate is lowered by the upper cylinder, and the position of the upper plate is maintained during molding by the extending pressure-resistant link mechanism,
The upper and lower cylindrical cylinders can be pressurized from above and below by operating the upper and lower punches by fluid pressure driving.

  The powder forming press machine according to this proposal is equipped with upper and lower punch plates and is driven by upper and lower cylindrical cylinders for processing, and can arbitrarily control the pressure and position of each punch. Is possible. As a result, even in stepped molding, for example, processing can be performed by applying pressure from both the upper and lower punches, so that no side pressure in one downward direction is applied to the die or core rod as in the prior art. As a result, the amount of pressurization and the speed can be controlled with reference to a particularly neutral surface, and the control becomes easier and the machining accuracy is improved as compared with the conventional case. Further, uniform pressurization from the top and bottom can also achieve a uniform density and a high density of the molded product.

The principal part sectional view showing the lower punch set and die set concerning the 1st embodiment, and the hydraulic cylinder mechanism. AA sectional view taken on the line AA of FIG. FIG. 3 is a sectional view taken along line BB in FIG. 1. The principal part perspective view of the partial fracture | rupture which showed the lower punch set and die set and hydraulic cylinder mechanism which concern on 1st Embodiment. The principal part sectional view showing the lower punch set and die set concerning the 2nd embodiment, and the hydraulic cylinder mechanism. The perspective view of the punch plate which concerns on 2nd Embodiment. The principal part sectional view showing the lower punch set and die set concerning the 3rd embodiment, and the hydraulic cylinder mechanism. The principal part sectional view showing the lower punch set and die set concerning the 4th embodiment, and the hydraulic cylinder mechanism. The principal part sectional view showing the upper punch set and hydraulic cylinder mechanism concerning a 5th embodiment. The front view which showed the whole powder molding press machine using the up-and-down punch set and hydraulic cylinder mechanism shown in FIG.8 and FIG.9. The figure explaining the 1st example of the pressurization of the up-and-down punch on the basis of the neutral surface, and the pressure release operation | movement. The figure explaining the 2nd example of the pressurization of the up-and-down punch on the basis of the neutral surface, and the pressure release operation | movement. The figure explaining the 3rd example of the pressurization of the up-and-down punch on the basis of the neutral surface, and the pressure release operation | movement.

  1st Embodiment of the lower punch set and die set in a powder shaping press machine is shown in FIGS. The lower punch set and die set of the first embodiment are the same as the lower punch and die set shown in FIGS.

  In the following embodiment, an upper and lower punch set corresponding to a three-step stepped molded product will be described as an example. In addition, although a hydraulic press is described as an example of the fluid pressure cylinder, the present invention is not limited to this, and the present invention can be applied to a press machine that uses fluid pressure including both hydraulic pressure and atmospheric pressure.

  FIG. 1 shows a die set 2a composed of a die plate 20a to which a die 10 is attached and a connecting rod 21a connected to the die plate 20a, and first to third lower punches to which first to third lower punches 11, 12, and 13 are attached. Lower punch sets 2b, 2c, 2d having connecting rods 21b, 21c, 21d connected to the plates 20b, 20c, 20d and the first to third lower punch plates 20b, 20c, 20d, and hydraulic pressure provided to the base plate 3 Lower cylinders 4a, 4b, 4c and 4d (4a is a lower center cylinder, 4b to 4d are lower cylindrical cylinders) and a lower cylinder 5 as cylinder mechanisms and a lower cylinder 5 are connected via connecting plates 6a, 6b, 6c and 6d. 1 is a partial longitudinal sectional view of a powder forming press machine 1. 2 is a sectional view taken along line AA in FIG. 1, FIG. 3 is a sectional view taken along line BB in FIG. 1, and FIG. 4 is a perspective view of the powder forming press machine 1 according to the embodiment. As shown in FIGS. 2 to 4, since each component is arranged radially, some components are not arranged on the aa center line and the bb center line because of the structure. Therefore, when a longitudinal sectional view is created along the center line of the press machine, some components are not shown. Therefore, in FIG. 1, in order to make it easy to grasp the entire image of the press machine according to the present embodiment, each component on the line cc in FIGS. 2 and 3 is projected onto the aa line as a center line, and this is used as a reference. Each component is described as follows.

  As shown in FIGS. 1 and 2, the lower center cylinder 4a stands on the base plate 3 so as to form a core piston 41a for connecting the core rod 14 serving as the center axis of the punch and a working chamber for driving the core piston 41a. And a central cylindrical wall 40a provided. The core rod is required when a shaft hole is provided in a molded product, and may be unnecessary depending on the molded product. In this case, the central cylinder can be omitted.

  The lower cylindrical cylinders 4b to 4d are surrounded by annular walls 40b to 40d erected on the base plate 3 at predetermined intervals so as to surround the central cylindrical wall 40a of the lower center cylinder 4a, and the annular walls 40b to 40d. Annular pistons 41b to 41d driven with the internal space as an action chamber, and piston rods 42a to 42c that are erected on the annular pistons 41b to 41d and connected to the connection plates 6a to 6c. And it has the sealing lid | cover 43 which penetrates the core piston 41a of the lower center cylinder 4a, and the piston rods 42a-42c of the lower cylindrical cylinders 4b-4d in an airtight or liquid tight state, and seals each working chamber. .

  Regarding the central cylindrical wall 40a and the annular walls 40b to 40d, the central cylindrical wall 40a is arranged on the base plate 3 in the center, and the annular walls 40b having a diameter larger than the central cylindrical wall 40a are concentrically arranged. An annular wall 40c having a larger diameter than the annular wall 40b and an annular wall 40d having a larger diameter than the annular wall 40c are arranged concentrically. Then, a core piston 41a for reciprocating the core rod 14 is built into the working chamber formed by the upright central cylindrical wall 40a, and the working chamber is an internal space surrounded by the annular walls 40b to 40d. It is the structure which incorporates the annular pistons 41b-41d which reciprocate the 1st-3rd lower punch 11-13. That is, the lower cylindrical cylinders 4b to 4d are arranged on the base plate 3 in a concentric shape centering on the core axis 14, that is, the central axis of the lower punch. Each piston 41a-41d is provided with a seal member 45 to seal the pressure oil for driving the piston.

  Piston rods 42a to 42c are connected to the annular pistons 41b to 41d, respectively. The piston rods 42a to 42c cannot be made thick due to their structure because the annular pistons 41b to 41d are relatively thin in the circumferential direction. Therefore, as shown in FIG. 2, a plurality of piston rods 42 a to 42 c are spaced apart from each of the annular pistons 41 b to 41 d in the circumferential direction so that they are arranged radially as viewed in the cross section of FIG. 2. I have to. In FIG. 2, there are four piston rods 42a, eight piston rods 42b, and twelve piston rods 42c. Further, as shown in FIG. 1, the length of the piston rods 42a to 42c is shortened to about twice as long as the stroke of the annular pistons 41b to 41d, and the stress deformation is less with respect to the load applied during the pressure molding. The structure is realized. The number, arrangement, and structure of the piston rods are appropriately designed according to the capability of the press machine. Moreover, about the core piston 41a, it is good also as a structure divided | segmented into the core piston and the piston rod for cores connected with this similarly to piston 41b-41d of the cylindrical cylinders 4b-4d and piston rod 42a-42c.

  The sealing lid 43 provided with a hole through which the core piston 41a and the piston rods 42a to 42c pass is sandwiched with the base plate 3 and sealed in a liquid-tight state to constitute the lower cylinders 4a to 4d. Seal housings 44a to 44d are provided on the sealing lid 43 to seal between the core piston 41a and the piston rods 42a to 42c and the outer end surfaces of the lower cylinders 4a to 4d. A piping port 46 a for injecting or discharging pressure oil for driving the core piston 41 a and the piston rods 42 a to 42 c up and down is provided in the sealing lid 43, and a piping port 46 b is provided in the base plate 3. That is, when driving the core piston 41a and the piston rods 42a to 42c upward, the pressure oil is injected into the working chamber from the piping port 46b, the pressure oil is discharged from the piping port 46a, and driven downward. Injects pressure oil into the working chamber from the piping port 46a and discharges the pressure oil from the piping port 46b.

  The lower cylinder 5 is provided below the base plate 3 separately from the central cylinder 4a and the cylindrical cylinders 4b to 4d, and drives the die 10. As shown in FIG. 1, the lower cylinder 5 includes a die cylinder wall 50 provided on the lower surface of the base plate 3, a die piston 51 for driving the die 10, a movable rod 52 connected to the die set 2a, a die It comprises a die piston head 53 that connects the piston 51 and the movable rod 52. The die piston 51 is provided with a sealing member 45 for sealing. Further, pressure oil piping ports 46 c and 46 d for driving the die piston 51 are provided on the side walls of the base plate 3 and the die cylinder wall 50.

  The connection plates 6a to 6d are connected to the piston rods 42a to 42c and the movable rod 52, respectively. As shown in FIGS. 1 to 4, the connection plates 6 a to 6 d are provided so as to correspond to the lower cylindrical cylinders 4 b to 4 d and the lower cylinder 5. That is, the connecting plate 6a corresponds to the lower cylindrical cylinder 4b, the connecting plate 6b corresponds to the lower cylindrical cylinder 4c, and the connecting plate 6c corresponds to the lower cylinder 4d. The connecting plate 6d is provided, the piston rod 42a and the connecting plate 6a are connected, the piston rod 42b and the connecting plate 6b are connected, the piston rod 42c and the connecting plate 6c are connected, and the movable rod 52 and the connecting plate 6d are connected. .

  As shown in FIG. 3, the connecting plates 6 a to 6 c have an annular shape whose diameter increases toward the outside, and the outermost connecting plate 6 d has a quadrilateral outer shape. However, this shape may be arbitrary. That is, all of the connecting plates may be circular, oval, quadrilateral, or a combination thereof. The upper surfaces of the connecting plates 6a to 6d are provided with connecting holes 60d and connecting recesses 60a to 60c for fixing the connecting rods 21a to 21d of the unitized die set 2a and lower punch sets 2b to 2d described below. ing. A guide hole 61 for guiding the core piston 41a is provided at the center of the connection plate 6a, and the connection hole 60d of the connection plate 6d passes therethrough.

  Next, the die set 2a and the lower punch sets 2b to 2d to which the die 10 and the first to third lower punches 11 to 13 are attached will be described. As shown in FIGS. 1 and 4, the die set 2 a and the lower punch sets 2 b to 2 d include a die plate 20 a for attaching the outermost die 10, a first lower punch plate 20 b for attaching the first lower punch 11, and a second one. A second lower punch plate 20c for attaching the lower punch 12, a third lower punch plate 20d for attaching the third lower punch 13, a connecting rod 21a connected to the die plate 20a, and a connecting rod 21b connected to the first lower punch plate 20b. The connecting rod 21c is connected to the second lower punch plate 20c, and the connecting rod 21d is connected to the third lower punch plate 20d.

  The die set 2a and the lower punch sets 2b to 2d are based on the middle plate 7 having guide holes 7a to 7e for guiding the connecting rods 21a to 21d and the core piston 41a, and are connected to the plates 20a to 20d. 21 d is connected by a screw 22. The connecting rods 21 a to 21 c are unitized by external setup through the guide holes 23 b to 23 d provided in the first to third lower punch plates 20 b to 20 d and the guide holes 7 a to 7 d of the middle plate 7. That is, the connecting rod 21a of the die plate 2a is inserted through the guide hole 23b of the first lower punch plate 20b and the guide hole 7a of the middle plate 7, and the connecting rod 21b of the first lower punch plate 20b is inserted into the second lower punch plate 20c. The guide hole 23c is inserted into the guide hole 7b of the middle plate 7, and the connecting rod 21c of the second lower punch plate 20c is inserted into the guide hole 23d of the third lower punch plate 20d and the guide hole 7c of the middle plate 7, and the third The connecting rod 21d of the lower punch plate 20d is inserted through the guide hole 7d of the middle plate 7. Note that the die set 2a and the lower punch sets 2b to 2d in FIG. 1 are connected to the connecting rods 21a to 21c and the guide holes 23b to 23d on the right side and the plates 20a to 20d on the left side with respect to the center line. Since the connection relationship of the rods 21a to 21d by the screw 22 is shown, it is not described as a symmetrical diagram. However, it is actually a symmetrical configuration.

  In the middle plate 7, the guide hole 7a is the connection hole 60d of the connection plate 6d, the guide hole 7b is the connection recess 60c of the connection plate 6c, the guide hole 7c is the connection recess 60b of the connection plate 6b, and the guide hole 7d is the connection plate. The connecting recess 60a of 6a and the guide hole 7e are provided at positions corresponding to the guide hole 61 provided at the center of the connecting plate 6a in the vertical direction. Further, fixing parts 62a to 62d (see FIG. 3) are fitted into portions of the connecting rods 21a to 21d fixed to the connecting plates 6a to 6d, for example, fixing tool fitting grooves 24a to 24d having a circumferential groove shape. It is recessed. As a result, the fixing tool 62a is fitted into the fixing tool fitting groove 24d, the fixing tool 62b is fitted into the fixing tool fitting groove 24c, the fixing tool 62c is fitted into the fixing tool fitting groove 24b, and the fixing tool 62d is fitted into the fixing tool fitting groove 24a. The connecting rods 21a to 21d are fixed to the connecting plates 6a to 6d.

  As shown in FIG. 1, the die 10 and the first to third lower punches 11 to 13 are connected to the die plate 20 a and the first to third punches by adapters such as a die retainer 9 a, a die holder 9 b, a punch retainer 9 c, and a punch receiving plate 9 d. It is set on the third lower punch plates 20b to 20d.

  The die set 2a and the lower punch sets 2b to 2d described above are configured by an external setup separately from the hydraulic cylinder mechanism.

  In the assembly work of connecting the lower cylindrical cylinders 4b to 4d and the lower cylinder 5 as the hydraulic cylinder mechanism and the lower punch sets 2b to 2d and the die set 2a, first, the die set 2a and lower The middle plate 7 of the punch sets 2b to 2d is placed on the middle plate support base 8. The middle plate support 8 is provided at such a height that the middle plate 7 is positioned between the third lower punch plate 20d and the connecting plates 6a to 6d, and the middle plate 7 is slid on the upper end surface thereof. A mold-shaped slide portion 8a is provided. Therefore, when the middle plate 7 is placed on the middle plate support base 8, the middle plate 7 is lifted up to the slide portion 8a appropriately provided on the middle plate support base 8, and is installed by sliding the slide portion 8a. It ’s fine. When the middle plate 7 is installed on the middle plate support 8 in this way, the guide holes 7a to 7d are positioned at the upper positions corresponding to the connection recesses 60a to 60c and the connection holes 60d of the connection plates 6a to 6d, The core piston 41a of the center cylinder 4a is inserted through the guide hole 7e.

  Next, the lower cylindrical cylinders 4b to 4d and the lower cylinder 5 are driven to raise the connection plates 6a to 6d, the connection rods 21b to 21d are inserted into the connection recesses 60a to 60c of the connection plates 6a to 6c, and the connection rod 21a. Is inserted into the connection hole 60d of the connection plate 6d. Then, as shown in FIG. 3, the fixtures 62 a to 62 d are fitted into the fixture fitting grooves 24 a to 24 d of the connecting rods 21 a to 21 d and fixed with a predetermined number of bolts 63. In this embodiment, the fixtures 62a to 62d are fixed on the connection plates 6a to 6d with two bolts 63 for each plate. The core rod 14 is screwed into a screw hole provided at the upper end of the core piston 41a.

  The fixtures 62a to 62c are fixed with bolts 63 on the upper surfaces of the connection plates 6a to 6c, while the fixture 62d is fixed with bolts 63 on the lower surface of the connection plate 6d. The connecting rod 21a of the die set 2a to which the die 10 is attached may also be fixed on the upper surface side of the connecting plates 6a to 6c similarly to the connecting rods 21b to 21d of the lower punch sets 2b to 2c to which the lower punches 11 to 13 are attached. However, the pull-out force of the lower cylinder 5 with respect to the die 10 acts greatly downward, and a tensile force is generated on the connecting rod 21a of the die set 2a to which the die 10 is attached, so that the connecting rod 21a portion protruding from the lower surface of the connecting plate 6d It is preferable that the fixing tool 62d is fitted in the fixing tool fitting groove 24a and is fixed by the bolt 63 from the lower surface.

  The unitized die set 2a and lower punch sets 2b to 2d, and the lower cylindrical cylinders 4b to 4d and the lower cylinder 5 can be connected and fixed by the above simple mounting operation.

  As described above, the cylinders 4a to 4d and 5 are connected to the corresponding connecting rods 21a to 21d via the connecting plates 6a to 6d. In terms of the above-described external setup and unitization, it is preferable to use the connecting plates 6a to 6d, but it is also possible to connect the cylinders 4a to 4d, 5 and the connecting rods 21a to 21d without using the connecting plate. It is.

  5 and 6 show a second embodiment in which the first to third lower punch plates 20b to 20d are not simply flat plate shapes, but are more resistant to bending. FIG. 5 shows a sectional view similar to FIG. 1, and FIG. 6 shows a perspective view of the lower punch plate 20b.

  In the lower punch plates 20b to 20d of the second embodiment, punch mounting portions 25b to 25d of the central portion to which the lower punches 11 to 13 are attached, and rod connecting portions 26b to 26d of the peripheral portions to which the connecting rods 21b to 21d are connected. Between these, step portions 27b to 27d in the axial direction (the operation direction of the cylinder and the rod) are formed. In particular, in the illustrated lower punch plates 20b to 20d, the step portions 27b to 27d have a cylindrical shape that surrounds the punch mounting portions 25b to 25d in a circular shape, whereby the outer shape of the lower punch plates 20b to 20d is a soup dish shape. (Or a bowler hat shape) (see FIG. 6). By forming the step portions 27b to 27d in this way, there is a portion extending in the axial direction in the cross section of the lower punch plates 20b to 20d extending from the punch attachment portions 25b to 25d to the rod connecting portions 26b to 26d. Become. That is, since the step portions 27b to 27d extend in the same direction as the load applied from the lower punches 11 to 13 and surround the punch mounting portions 25b to 25d, the lower punch plate 20b of this embodiment. -20d becomes difficult to bend compared with the lower punch plate of 1st Embodiment made into simple flat form. Thereby, the precision of a punch position can be improved and the further high precision of a molded product can be implement | achieved.

  The shape of the stepped portions 27b to 27d can be other than the illustrated cylindrical shape, and the punch mounting portions 25b to 25d can also be formed into a cylindrical shape surrounding the polygon in a plan view. However, considering that the load applied from the punch is evenly distributed, a cylindrical shape is suitable. Further, the step portions 27b to 27d of the present embodiment are convex upward (approaching the dish), but the same effect can be obtained even when convex downward. However, the upward convex is advantageous in terms of compactness because a plurality of lower punch plates 20b to 20d can be nested in a nested manner as will be described below.

  The first to third lower punch plates 20b to 20d are designed so that the size decreases from the top to the bottom, but all have a substantially similar shape. That is, it is a similar shape having quadrilateral rod connecting portions 26b to 26d, cylindrical step portions 27b to 27d, and circular punch mounting portions 25b to 25d, and the diameter (circular shape) of the cylindrical step portions 27b to 27d. The diameters of the punch mounting portions 25b to 25d) are formed so as to decrease from top to bottom. Accordingly, as can be seen from FIG. 5, the stepped portion 27c and the punch mounting portion 25c of the second lower punch plate 20c positioned below can enter inside the stepped portion 27b of the first lower punch plate 20b positioned above. It is possible to shrink a plurality of punch plates in a nested manner. In the illustrated example, the third lower punch plate 20d has a size that allows only the punch presser 9c and the punch receiving plate 9d to enter the stepped portion 27c of the second lower punch plate 20c. If the size of each punch plate is adjusted, the step portions and punch mounting portions of all punch plates can be nested.

  FIG. 7 shows a third embodiment with the same cross section as FIG. 1 in which the lower cylinder is unnecessary.

  In the case of the third embodiment, the lower punch set 2b to which the first lower punch 11 is attached is fixed to the middle plate 7, and the lower cylindrical cylinder 4d used for the lower punch set 2b is attached to the die set 2a to which the die 10 is attached. Used for driving. That is, the piston rod 42c of the lower cylindrical cylinder 4d and the die set 2a are connected via the connecting plate 6d. In the case of this embodiment, a large number of piston rods 42c are arranged on the annular piston 41d so as to cope with the extraction force of the die 10. That is, normally, the die is driven by using the lower cylinder 5 as shown in FIG. 1 to generate a large pulling force downward, so that the movable rod 52 (FIG. 1) that can withstand the tensile force caused by this is required. However, in the present embodiment, a large number of piston rods 42c are arranged on the annular piston 41d so that the die 10 can withstand the pulling force. This can be implemented by making the cylinder cylindrical so that the piston rod can be arbitrarily arranged. Since this configuration eliminates the need for the lower cylinder, a pit formed by digging under the base plate for the lower cylinder is not required, the installation is easy, and the overall height of the powder molding press machine 1 can be shortened.

  In the third embodiment, the punch set 2b of the first lower punch is fixed to the middle plate 7, but a punch set of another lower punch may be fixed. Other configurations are the same as those in FIG.

  FIG. 8 shows a fourth embodiment in which the lower cylinder is unnecessary in the same cross section as FIG.

  In the fourth embodiment, the lower central cylinder 4a of the first stage and the lower cylindrical cylinders 4b to 4e of the fourth stage are formed, and the die set 2a for attaching the die 10 and the first to third lower punches 11 to 13 are attached. All of the lower punch sets 2b to 2d are connected to the lower cylindrical cylinders 4b to 4e. The outermost lower cylindrical cylinder 4e is provided with an annular wall 40e standing so as to surround the annular wall 40d (the outermost annular wall in FIG. 1) at a predetermined interval, and an inner space surrounded by the annular wall 40e. An annular piston 41e is incorporated as a working chamber. A plurality of piston rods 42 d are erected on the annular piston 41 e and are liquid-tightly sealed by a sealing lid 43. That is, unlike the third embodiment, the lower cylindrical cylinder 4e for die setting is formed, and the piston rod 42d of the lower cylindrical cylinder 4e and the die set 2a are connected by the connecting plate 6d. Since the piston rod 42d is for driving a die, many piston rods 42d can be provided as in the third embodiment. According to the fourth embodiment, the same advantages as those of the third embodiment can be obtained.

  FIG. 9 is a cross-sectional view corresponding to FIG. 1 showing a fifth embodiment of an upper punch set provided above the lower punch set and the die set. This upper punch set can basically be considered as an upside down version of the lower punch set, except for die set related parts. In addition, the core rod is necessary or unnecessary, and is appropriately provided according to the shape of the molded product.

  The upper punch sets 102b, 102c, 102d according to the fifth embodiment include first to third upper punch plates 120b, 120c, 120d and first to third uppers to which the first to third upper punches 111, 112, 113 are attached. The connecting rods 121b, 121c, and 121d are connected to the punch plates 120b, 120c, and 120d. Further, in this embodiment, the upper cylinders 104a, 104b, 104c, and 104d (104a is the upper center cylinder, and 104b to 104d are the upper cylindrical cylinders) as hydraulic cylinder mechanisms are disposed below the upper plate 103 that is the upper ram. Has been. The connecting rods 121b to 121d and the upper cylindrical cylinders 104b to 104d are connected via connecting plates 106a, 106b, and 106c. When the core rod is unnecessary, it is not necessary to provide the upper center cylinder 104a. Alternatively, a structure in which the innermost punch is driven using a central cylinder may be employed.

  The upper center cylinder 104a includes a core piston 141a that connects the upper core rod 114, and a central cylindrical wall 140a that is erected on the upper plate 103 so as to form a working chamber that drives the core piston 141a. The upper cylindrical cylinders 104b to 104d include annular walls 140b to 140d erected on the upper plate 103 at predetermined intervals so as to surround the central cylindrical wall 140a of the upper center cylinder 4a, and the annular walls 140b to 140d. Annular pistons 141b to 141d driven with the inner space surrounded by the working chamber as a working chamber, and piston rods 142a to 142c standing on the annular pistons 141b to 141d and connected to the connecting plates 106a to 106c. Yes. And it has the sealing lid 143 which penetrates the core piston 141a of the upper center cylinder 104a and the piston rods 142a to 142c of the upper cylindrical cylinders 104b to 104d in an airtight or liquid tight state and seals each working chamber. .

  For the central cylindrical wall 140a and the annular walls 140b to 140d, the central cylindrical wall 140a is arranged at the center below the upper plate 103, and the annular walls 140b having a diameter larger than the central cylindrical wall 140a are arranged concentrically. An annular wall 140c having a larger diameter than the annular wall 140b and an annular wall 140d having a larger diameter than the annular wall 40c are concentrically arranged. Then, in the working chamber formed by the upright central cylindrical wall 140a, a core piston 141a for reciprocating the upper core rod 114 is incorporated, and in the working chamber which is an internal space surrounded by the annular walls 140b to 140d, An annular piston 141b to 141d for reciprocating the first to third upper punches 111 to 113 is built in. That is, the upper cylindrical cylinders 104b to 104d are arranged below the upper plate 103 in a concentric shape with the upper core rod 114, that is, the central axis of the upper punch as the center. Each piston 141a to 141d is provided with a seal member 145 to seal the pressure oil for driving the piston.

  Piston rods 142a to 142c similar to those of the above embodiment are connected to the annular pistons 141b to 141d, respectively. In addition, about the core piston 141a, it is good also as a structure divided | segmented into the core piston and the piston rod for cores connected with this similarly to piston 141b-141d of the cylindrical cylinders 104b-104d and piston rod 142a-142c.

  A sealing lid 143 provided with a hole through which the core piston 141a and the piston rods 142a to 142c penetrate is at least liquid-tightly sealed with the upper plate 103 to constitute the upper cylinders 104a to 104d. Seal housings 144a to 144d are provided on the sealing lid 143 to seal between the core piston 141a and piston rods 142a to 142c and the outer end surfaces of the upper cylinders 104a to 104d. In addition, a piping port 146 a for injecting or discharging pressure oil that drives the core piston 141 a and the piston rods 142 a to 142 c up and down is provided in the sealing lid 143, and similarly, a piping port 146 b is provided in the upper plate 103. That is, when driving the core piston 141a and the piston rods 142a to 142c downward, the pressure oil is injected into the working chamber from the piping port 146b, the pressure oil is discharged from the piping port 146a, and driven upward. Injects pressure oil into the working chamber from the piping port 146a and discharges the pressure oil from the piping port 146b.

  The connection plates 106a to 106c are connected to the piston rods 142a to 142c, respectively. Similar to the above embodiment, the connecting plates 106a to 106c are provided so as to correspond to the upper cylindrical cylinders 104b to 104d. That is, a connecting plate 106a is provided corresponding to the upper cylindrical cylinder 104b, a connecting plate 106b is provided corresponding to the upper cylindrical cylinder 104c, and a connecting plate 106c is provided corresponding to the upper cylindrical cylinder 104d. 142a is connected to the connecting plate 106a, the piston rod 142b is connected to the connecting plate 106b, and the piston rod 142c is connected to the connecting plate 106c.

  The connection plates 106a to 106c have an annular shape whose diameter increases toward the outside, as in the above embodiment. However, this shape may be arbitrary and may be an ellipse, a quadrilateral, or a combination thereof. On the upper surface of the connecting plates 106a to 106c, connecting concave portions 160a to 160c for fixing the connecting rods 121b to 121d of the unitized upper punch sets 102b to 102d described below are provided. A guide hole 161 for guiding the core piston 141a is provided at the center of the connecting plate 106a.

  Upper punch sets 102b to 102d to which the first to third upper punches 111 to 113 are attached include a first upper punch plate 120b to which the first upper punch 111 is attached, a second upper punch plate 120c to which the second upper punch 112 is attached, and a third one. A third upper punch plate 120d for attaching the upper punch 113, a connecting rod 121b connected to the first upper punch plate 120b, a connecting rod 121c connected to the second upper punch plate 120c, and connected to the third upper punch plate 120d. A connecting rod 121d is provided.

  The upper punch sets 102b to 102d are based on the middle plate 107 having guide holes 107b to 107e for guiding the connecting rods 121b to 121d and the core piston 141a, and the connecting rods 121b to 121d are screwed to the plates 120b to 120d. It has the structure connected by. The connecting rods 121b to 121d are unitized by external setup through the guide holes 123c and 123d provided in the second and third upper punch plates 120c and 120d and the guide holes 107b to 107d of the middle plate 107. That is, the connecting rod 121b of the first upper punch plate 120b is inserted into the guide hole 123c of the second upper punch plate 120c and the guide hole 107b of the middle plate 107, and the connecting rod 121c of the second upper punch plate 120c is inserted into the third upper punch plate 120c. The guide hole 123d of the plate 120d and the guide hole 107c of the middle plate 107 are inserted, and the connecting rod 121d of the third upper punch plate 120d is inserted into the guide hole 107d of the middle plate 107.

  In the middle plate 107, the guide hole 107b is a connection recess 160c of the connection plate 106c, the guide hole 107c is a connection recess 160b of the connection plate 106b, the guide hole 107d is a connection recess 160a of the connection plate 106a, and the guide hole 107e is a connection plate. A guide hole 161 provided at the center of 106a is provided at a position corresponding to the vertical direction. Similarly to the above-described embodiment, the fixing rod fitting grooves into which the fixing members 162a to 162c are fitted are recessed in the portions of the connecting rods 121b to 121d fixed to the connecting plates 106a to 106c, respectively. 162c is fitted. In the case of the upper punch sets 102b to 102d, the connecting rods 121b to 121d inserted into the connecting recesses 160a to 160c are fixed with screws 122 from the opposite side of the connecting plates 106a to 106c. According to this, it may be unnecessary to use the fixtures 162a to 162c.

  As shown in the drawing, the first to third upper punches 111 to 113 are set on the first to third upper punch plates 120b to 120d by adapters such as a punch retainer 109c and a punch receiving plate 109d.

  Apart from the hydraulic cylinder mechanism, these upper punch sets 102b to 102d can be configured by external setup and unitized.

  In the assembly work of connecting the upper cylindrical cylinders 104b to 104d as the hydraulic cylinder mechanism and the upper punch sets 102b to 102d, first, the middle plate 107 of the upper punch sets 102b to 102d, which is unitized by external setup, It is assembled to the plate support wall 108. The middle plate support wall 108 is provided at a height that allows the middle plate 107 to be positioned between the third upper punch plate 120d and the connecting plates 106a to 106c. A U-shaped slide groove 108a is recessed. Therefore, when the middle plate 107 is assembled to the middle plate support wall 108, the middle plate 107 is lifted up to the slide groove 108a of the middle plate support wall 108 and slid along the slide groove 108a. . When the middle plate 107 is installed in the middle plate support wall 108 in this way, the guide holes 107b to 107d are positioned at the lower positions corresponding to the connection recesses 160a to 160c of the connection plates 106a to 106c, and are inserted into the guide holes 107e. Is inserted through the core piston 141a of the upper center cylinder 104a.

  Next, the upper cylindrical cylinders 104b to 104d are driven to lower the connecting plates 106a to 106c, and the connecting rods 121b to 121d are inserted into the connecting recesses 160a to 160c of the connecting plates 106a to 106c. And it fixes with the screw | thread 122 from the other side of connection plate 106a-106c. Prior to assembly of the middle plate 107, the fixtures 162a to 162c are preferably fitted into the fixture fitting grooves of the connecting rods 121b to 121d. The upper core rod 114 is screwed into a screw hole provided at the upper end of the core piston 141a.

  With the above simple mounting operation, the unitized upper punch sets 102b to 102d and the upper cylindrical cylinders 104b to 104d can be connected and fixed.

  Also in the fifth embodiment, it is preferable to use the connecting plates 106a to 106c in terms of the above-described external setup and unitization, but the upper cylindrical cylinders 104b to 104d and the connecting rods 121a to 121a are not connected to the connecting plate. It is also possible to connect 121c.

  FIG. 10 shows an example of the entire image of the powder molding press machine 1 using the lower punch set and die set of FIG. 8 and the hydraulic cylinder mechanism, and the upper punch set and hydraulic cylinder mechanism of FIG. As shown in the figure, in particular, by combining an upper punch set as shown in FIG. 9 with the lower punch set and die set shown in FIGS. A press machine can be provided.

  In addition to this, as the upper and lower punch plates, plates with axial step portions shown in FIGS. 5 and 6 can also be used. As described above, the punch plate has a step portion that extends in the same direction as the load applied from the punch and surrounds the punch mounting portion in the plate cross section from the punch mounting portion to the rod connecting portion. It has a structure that is difficult to bend. Therefore, by using the punch plate having this structure, it is possible to improve the accuracy of the punch position, and it is possible to achieve further high accuracy of the molded product.

  In the powder molding press machine 1 of FIG. 10, the lowermost base plate 3 is a quadrilateral, and four columns 200 are erected substantially vertically from the four corners. The base plate 3 is the base plate shown in FIG. 8, and the lower punch set and die set, the lower center cylinder, and the lower cylindrical cylinder in FIG.

  A quadrilateral upper frame 201 is fixed to the top of the column 200, a hydraulic upper cylinder 202 is attached to the upper frame 201, and a pressure-resistant link that connects the upper cylinder 202 and the upper plate 103. A mechanism 203 is provided. That is, the upper cylinder 202 plays a role of moving the upper plate 103 of the upper punch set up and down as an upper ram. The upper plate 103 has four struts 200 penetrating as guides, and slides up and down along the struts 200. The pressure-resistant link mechanism 203 extends as the upper plate 103 moves downward, and counteracts the reaction force during pressurization in the extended state, and is provided to maintain the position of the upper plate 103 during molding. Driving the upper plate 103 directly with the upper cylinder 202 is advantageous for energy saving and high-speed operation.

  The upper plate 103 is the upper plate shown in FIG. 9, and the upper punch set, the upper center cylinder, and the upper cylindrical cylinder in FIG. 9 are disposed below the upper plate. The upper punches 111 to 113 and the upper core rod 114 assembled to the upper plate 103 are positioned with respect to the die 10 and face the lower punches 11 to 13 and the core rod 14. As a result, a molded product having steps on both the upper and lower surfaces can be pressed.

  Each hydraulic cylinder mechanism of the powder molding press machine 1 is controlled by a control device 300 having an operation panel on the front surface. In the servo control system, each cylinder is operated by a hydraulic pump driven by a servo motor. A large number of hydraulic cylinders can be controlled with a compact configuration, and it can be driven with the minimum required power, wasting unnecessary energy. It can be a system that does not.

  As described above, the powder molding press machine 1 shown in FIG. 10 includes a top and bottom punch plate, and is configured to perform processing by driving these with upper and lower cylindrical cylinders. The position can be arbitrarily controlled. Thereby, since it can process by pressing from both upper and lower punches, side pressure in one downward direction is not applied to the die and core rod as in the prior art. As a result, the pressurization amount and speed can be controlled with reference to the neutral plane between the opposing upper and lower punches, which makes control easier and improves the processing accuracy. Further, uniform pressurization from the top and bottom can also achieve a uniform density and a high density of the molded product.

  FIG. 11 to FIG. 13 are explanatory diagrams showing processing based on the neutral plane by the upper and lower punches.

  The first example of FIG. 11 is an explanation when a molded product having no step on the surface is processed using, for example, one upper and lower punches. In this case, first, the lower punch is first inserted into the die and stopped at the filling position, and a predetermined amount of powder is filled into the die. Then, for example, by driving the upper cylinder as shown in FIG. 10, the upper punch is lowered to the mold clamping position and stopped (A). Thereafter, the upper and lower punches are driven together with the neutral surface of the filled powder in the die calculated based on the shape of the molded product and the powder filling amount as a reference, and pressurization is started (B). Thus, by pressing from above and below with the neutral surface as a reference, compression is performed at the same density above and below the molded product, so that a molded product with uniform density and high density can be obtained. Further, since the upper and lower punches are driven toward the neutral plane, it is not necessary to consider a side pressure in one direction with respect to the die. When pressurization is completed, the upper and lower punches are driven to perform depressurization (decompression) (C), and the mold is opened. Since the upper and lower punches are driven together at the time of this evacuation, the pressure balance is balanced between the upper and lower sides, and the molded product can be taken out without any cracks.

  The second example of FIG. 12 is an explanation when stepping is performed on both surfaces of a molded product. First, the lower punch is raised into the die, the lower punch is stopped at the filling position determined according to the shape of the molded product, and a predetermined amount of powder is filled into the die. Then, for example, the upper punch as shown in FIG. 10 is driven to the mold clamping position and stopped (A). Further, the upper and lower punches of each stage are positioned at the pressurization start position on the basis of each stage neutral surface of the filled powder in the die calculated based on the shape of the molded product and the powder filling amount, and the powder is transferred (B). Thus, when the upper and lower punches are positioned at the pressurization start position, the upper and lower punches are driven together with the neutral surface as a reference, and pressurization is started (C). As above, by pressing from above and below with respect to the neutral surface, compression is performed at the same density above and below the molded product, so that a molded product with uniform density and high density can be obtained. Further, since the upper and lower punches are driven toward the neutral plane, it is not necessary to consider a side pressure in one direction with respect to the die. When pressurization is completed, the upper and lower punches are driven to perform depressurization (D), and the mold is opened. Since the upper and lower punches are driven together at the time of this evacuation, the pressure balance is balanced between the upper and lower sides, and the molded product can be taken out without any cracks.

  The third example of FIG. 13 is an explanation when stepping (undercut) is performed on the side surface of the molded product. In this case, for example, a convex mold for forming a step is formed on the inner side surface of the die, and the die can be opened to the left and right for demolding. First, the lower punch is first raised into the die and stopped at the filling position, and a predetermined amount of powder is filled into the die. Then, for example, by driving the upper cylinder as shown in FIG. 10, the upper punch is lowered to the mold clamping position and stopped (A). Thereafter, the upper and lower punches are driven together with the neutral surface of the filled powder in the die calculated based on the shape of the molded product and the powder filling amount as a reference, and pressurization is started (B). Thus, by pressing from above and below with the neutral surface as a reference, compression is performed at the same density above and below the molded product, so that a molded product with uniform density and high density can be obtained. Further, since the upper and lower punches are driven toward the neutral plane, it is not necessary to consider a side pressure in one direction with respect to the die. When pressurization is completed, the upper and lower punches are driven to perform depressurization (depressurization) (C), and the die is further divided to open the mold (D). Since the upper and lower punches are driven together at the time of this evacuation, the pressure balance is balanced between the upper and lower sides, and the molded product can be taken out without any cracks.

DESCRIPTION OF SYMBOLS 1 Powder shaping press machine 2a Die set 2b-2d Lower punch set 3 Base plate 4a Lower center cylinder 4b-4e Lower cylindrical cylinder 6a-6d Connection plate 7 Middle plate 7a-7e Guide hole 8 Middle plate support base 8a Slide part 9a Die Presser 9b Die holder 9c Punch holder 9d Punch receiving plate 10 Die 11-13 Lower punch 14 Core rod 20a Die plates 20b-20d Punch plates 21a-21d Connecting rod 22 Screws 23b-23d Guide holes 24a-24d Fixing fitting insertion groove 40a Central cylindrical wall 40b-40e annular wall 41a core piston 41b-41e annular piston 42a-42d piston rod 43 sealing lids 44a-44d seal housing 60a-60c coupling recess 60d coupling hole 61 guide holes 62a-62d Fixing tool 63 Bolt 102b to 102d Upper punch set 103 Upper plate 104a Upper center cylinder 104b to 104d Upper cylindrical cylinder 106a to 106c Connection plate 107 Middle plate 107b to 107e Guide hole 108 Middle plate support wall 108a Slide groove 109c Punch presser 109d Punch Receiving plate 111-113 Lower punch 114 Upper core rod 120b-120d Punch plate 121b-121d Connecting rod 122 Screw 123c, 123d Guide hole 140a Central cylindrical wall 140b-140d Annular wall 141a Upper core piston 141b-141d Annular piston 142a-142c Piston rod 143 Sealing lids 144a to 144d Seal housings 160a to 160c Connection recess

Claims (4)

A powder molding press machine that performs press molding by placing one or more upper and lower punches in the die with the die as the outermost shell,
One or more upper punch sets including an upper punch plate for attaching the upper punch and a connecting rod connected to the upper punch plate;
One or more lower punch sets including a lower punch plate to which the lower punch is attached and a connecting rod connected to the lower punch plate;
One or more upper cylindrical cylinders arranged concentrically around the central axis of the upper punch and disposed below the upper plate and connected to the connecting rod of the upper punch set;
A plurality of lower cylindrical cylinders concentrically centered about the central axis of the lower punch, disposed on the base plate, and connected to the connecting rod of the lower punch set;
Comprising
The lower punch set is disposed inside a plurality of pillars erected on the base plate, and the upper plate is slidably attached to the pillars up and down.
An upper cylinder is provided on the upper frame fixed to the support column, and the upper cylinder is connected to the upper plate via a pressure-resistant link mechanism,
The pressure-resistant link mechanism extends as the upper plate is lowered by the upper cylinder, and the position of the upper plate is maintained during molding by the extending pressure-resistant link mechanism,
By hydraulically driving the upper and lower cylindrical cylinders, the upper and lower punches can be operated to be pressurized from above and below,
Powder molding press machine. A powder molding press machine that performs press molding by placing one or more upper and lower punches in the die with the die as the outermost shell,
One or more upper punch sets including an upper punch plate for attaching the upper punch and a connecting rod connected to the upper punch plate;
One or more lower punch sets including a lower punch plate to which the lower punch is attached and a connecting rod connected to the lower punch plate;
A die set having a die plate for attaching the die and a connecting rod connected to the die plate;
One or more upper cylindrical cylinders arranged concentrically around the central axis of the upper punch and disposed below the upper plate and connected to the connecting rod of the upper punch set;
A plurality of lower cylindrical cylinders arranged concentrically around the central axis of the lower punch and disposed on the base plate, connected to the connecting rod of the lower punch set and the connecting rod of the die set;
Comprising
The lower punch set and the die set are disposed inside a plurality of support columns erected on the base plate, and the upper plate is slidably attached to the support columns.
An upper cylinder is provided on the upper frame fixed to the support column, and the upper cylinder is connected to the upper plate via a pressure-resistant link mechanism,
The pressure-resistant link mechanism extends as the upper plate is lowered by the upper cylinder, and the position of the upper plate is maintained during molding by the extending pressure-resistant link mechanism,
By hydraulically driving the upper and lower cylindrical cylinders, the upper and lower punches can be operated to be pressurized from above and below,
Powder molding press machine. A center cylinder provided inside the innermost lower cylindrical cylinder;
A core rod coupled to the central cylinder;
Including
The core rod is arranged in the center with the die as the outermost shell, and the lower punch is arranged between the die and the core rod.
The powder molding press machine according to claim 1 or 2. An upper center cylinder provided inside the innermost upper cylindrical cylinder;
An upper core rod coupled to the upper center cylinder;
Including
The upper core rod is disposed in the center with the die as the outermost shell, and the upper punch is disposed between the die and the upper core rod.
The powder molding press machine according to claim 3.

Images