JP3917600B2 - Powder forming press machine - Google Patents

Description

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

  Powder molding press machines include a method in which the positions of the die and punch that determine the thickness (height) of a molded product are determined by a mechanical stopper, and a method in which the position is controlled using a hydraulic cylinder or the like. With the recent demand for high precision and near net shaping for molded products, the demand for powder molding press machines equipped with hydraulic cylinders is increasing due to the generalization of servo control technology. This hydraulic cylinder receives a load applied to the punch during pressing. When a multistage molded product is manufactured using a plurality of punches, the load applied to each hydraulic cylinder varies depending on the shape of the molded product. . Therefore, the more complicated the shape of the molded product, the more hydraulic cylinders that can accommodate a plurality of punches are required, and the powder molding press machine becomes larger, and a pressure receiving capability greater than the molding capability is required. Generally, in the lower three-stage molding, one die is required for the outermost shell, three punches, and one core rod are required. The total pressure receiving capability that the pressure receiving cylinder mechanism can withstand is 1.5 to 1.5 of the molding capability. Must be doubled.

As such a conventional powder forming press machine, one having a structure in which hydraulic cylinders corresponding to a plurality of punches are coaxially arranged in series is disclosed in, for example, Japanese Patent Publication No. 7-115233, and one punch For example, Japanese Patent Application Laid-Open No. 2002-115003 discloses a structure having a structure that receives two cylinders.
Japanese Patent Publication No.7-115233 However, since the powder molding press machine disclosed in Patent Document 1 has a structure in which hydraulic cylinders are coaxially stacked in series, the overall height is very high. Therefore, since the transmission distance of the load load transmitted to each component in the axial direction varies, different deflections and bucklings occur for each component, and when assembling a press machine, the deflection and buckling elements, etc. It must be calculated in detail. In addition, member selection is also an important factor.

  Furthermore, since the overall height is high, the number of correction elements when attaching the die or punch increases due to the elongation or compression generated in each component, making it difficult to maintain controllability.

  In addition, this powder molding press machine has a punch set (second punch adapter 22, third punch adapter 23, etc. in FIG. 1 of Patent Document 1) and a core rod for mounting the second punch and the third punch. Since it becomes extremely long, it takes a long time to replace them.

  On the other hand, since the powder molding press machine disclosed in Patent Document 2 needs to arrange two cylinders symmetrically in the press machine width direction with respect to one punch, when increasing the number of punches, the width direction In addition, the press machine itself becomes large and there is a problem in stability when the pressure receiving capacity is insufficient or when two cylinders are controlled simultaneously.

  Therefore, in view of the above-mentioned conventional problems, the object of the present invention is to downsize the pressure receiving cylinder mechanism that satisfies the pressure receiving capability of multistage molding, thereby reducing the overall height without increasing the size of the press machine itself, It is an object of the present invention to provide a pressure forming cylinder mechanism, and to provide a die set for attaching a die and a punch when changing a molded product, and a powder molding press machine in which the punch set can be easily attached and detached.

  Another object of the present invention is to provide a structure for concentrating the resultant force of the load load on the pressure receiving center to minimize stress deformation and deflection generated in each component of the powder molding press machine, An object of the present invention is to provide a powder molding press machine that can easily perform setup work and servo control (numerical control) as a configuration in which punches can be assembled by external setup.

In the powder molding press machine of the present invention that solves such problems, a core rod is arranged in the center with the die as the outermost shell, and two or more punches having different diameters are juxtaposed between the die and the core rod to perform press molding. In the powder forming press machine to perform,
Comprising: a die set comprising a connecting rod which is connected to the die plate and the die plate for mounting the die and a plurality of punches set of connecting rods connected to the punch plate and the punch plate mounting said plurality punches respectively, the and, the central cylinder and said central diameter of different tubular cylinder surrounding the cylinder to be connected to the core rod is disposed on the base plate, a and their tubular cylinder and at least the plurality punch sets each of the connecting rod so as to couple via corresponding connection plate, with the fluid pressure (air pressure or hydraulic) and configured to drive the central cylinder and the tubular cylinder, the central cylinder, a core piston for connecting core rod, the To the base plate so as to form a working chamber that drives the core piston A plurality of cylindrical cylinders, and each of the plurality of cylindrical cylinders includes an annular wall erected on the base plate so as to surround the central cylindrical wall of the central cylinder with a predetermined interval therebetween. An annular piston driven with the inner space surrounded by the annular wall as a working chamber, and a plurality of piston rods that are separated from the annular piston and are connected to the connecting plate. And having a sealing lid that penetrates the core piston of the central cylinder and the piston rods of the plurality of cylindrical cylinders in an air-tight or liquid-tight state and seals each working chamber. And
That is, a cylinder as a pressure receiving cylinder mechanism is formed into a cylindrical shape and surrounded by different diameters for each cylindrical cylinder corresponding to a punch to be reciprocated, so that a plurality of cylinders that have been provided independently can be provided. The pressure receiving cylinder mechanism can be provided in a concentrated manner at the same location, and the pressure receiving cylinder mechanism can be reduced in size without being stacked in the height direction. Further, since the cylindrical cylinder is concentrated in the center in this way, the cylindrical cylinder is provided in a one-to-one relationship with the punch to be pressure-receiving, so that the load can be concentrated in the center. It is possible to provide a press machine that is excellent in performance and balanced. Further, the powder molding press machine according to the present invention has a separation structure in which a cylindrical cylinder as a pressure receiving cylinder mechanism provided in the press machine body and a plurality of punch sets are connected via a connecting plate. By preparing several sets in advance as a unit, it is possible to replace dies and punches with changes in the molded product by so-called external setup, greatly reducing setup work time and improving productivity. It will be possible to improve.

In addition, as described above, the center cylinder includes a core piston that connects the core rods, and a central cylindrical wall that is erected on the base plate so as to form a working chamber that drives the core piston. An annular wall erected on the base plate so as to surround the central cylindrical wall of the central cylinder at a predetermined interval, an annular piston that is driven using an internal space surrounded by the annular wall as a working chamber, A piston rod standing on the annular piston and connected to the connecting plate, and penetrating the core piston of the central cylinder and the piston rod of the cylindrical cylinder in an airtight or liquid tight manner and sealing each working chamber. a structure having a stopper lid, from the working chamber an inner space surrounded by the annular wall, need multiple surrounding the independence of the tubular cylinder such as the bearing structure Since Kunar, it is possible to achieve the promotion of miniaturization.

In addition, the piston, the piston rod is Hanare設mutually a plurality upright, that have the plurality of piston rods connected to the connecting plate. Moreover, since the cylinder is cylindrical, there is a great degree of freedom in the number and arrangement of piston rods. Therefore, the piston rods should be arranged in a well-balanced manner while taking into account the service stress with respect to the load, and the combined force of the load is received by erecting the piston rods at equal intervals in the circumferential direction of the annular piston. Design to concentrate on the center becomes easy.

  In this press machine, the connecting rod of the punch set is inserted into the connecting recess of the corresponding connecting plate and fixed with a fixture. Thus, if it is set as the simple structure which inserts in a connection recessed part and fixes with a fixing tool, for example, it will be unitized by the connection operation | work of a some cylindrical cylinder and one or more punch sets, ie, a pressure receiving cylinder mechanism, and external setup. Since the connecting operation with the punch set is facilitated, productivity is further improved. In this case, since the compressive force is applied to the connecting rod of the punch set by the load from the upper cylinder and the repulsive force from the cylindrical cylinder, the connecting rod is preferably fixed on the upper surface side of the connecting plate. For this fixing, a fixing tool fitting groove may be provided at the position of the upper surface of the connecting plate of the inserted connecting rod, and a fixing tool that fits into the groove and is fixed to the upper surface of the connecting plate may be used. In this way, the die set to which each punch is attached can be fixed easily and reliably.

  On the other hand, the connecting rod of the die set is connected to a connecting plate that is provided under the base plate and connected to a lower cylinder that reciprocates the die. Thus, if the connecting plate connected to the lower cylinder is provided separately from the connecting plate connected to the piston rod of the cylindrical cylinder, the cylindrical cylinder provided on the upper surface of the base plate is used for punching, and is provided below the base plate. The lower cylinder can be configured for a die.

  Further, the connecting rod of the die set may be connected to the cylindrical cylinder via a corresponding connecting plate. This is a structure in which all of the die set and punch set are connected to a corresponding cylindrical cylinder via a connecting plate. For example, if there is one die at the top, three punches, and one core rod, the center cylinder is one and the cylindrical cylinder is four. According to this structure, since the lower cylinder under the base plate is not required, it is not necessary to dig up the ground for the lower cylinder, the installation of the powder forming press machine is easy, and the overall height of the press machine can be further shortened. . Moreover, the extraction force and tensile strength of the molded product that drives the die downward can be solved by increasing the piston rod on the annular piston of the cylindrical cylinder.

  In such a connecting structure of the die set and the connecting plate, the connecting rod of the die set is inserted into the connecting hole of the corresponding connecting plate and fixed by the fixture. In this case, the connecting rod of the die set may be fixed on the upper surface side of the connecting plate in the same way as the connecting rod of the punch set. However, the connecting rod of the die set to which the die is attached is pulled by a large pulling force downward. Since force is applied, it is good to fix on the lower side of the connecting plate. This fixing includes a connecting hole through which the connecting plate penetrates, and a connecting rod is inserted into the penetrating connecting hole, and the fixing tool is inserted into the fixing tool fitting groove of the connecting rod portion protruding to the lower surface of the connecting plate. If it is set as the structure which fixes a fixing tool to a connection plate lower surface, it will become a structure which can bear the extraction force by a lower cylinder.

  In each of the above-described configurations, the core piston is inserted, and the middle plate having a guide hole for guiding the connecting rod of the connecting plate and the connecting recess of the connecting plate through the die set and the punch set is provided on the base plate. The middle plate may be further provided with a middle plate support that positions the middle plate closer to the cylindrical cylinder than the punch plate to which the innermost punch is attached. If a middle plate with such a guide hole is provided between the connecting plate and the die set and punch set using a middle plate support, the connecting plate can be simply inserted into the guide hole. It is possible to guide to the connecting recess or the connecting hole provided in the, so that the mounting work of the unitized die set and punch set is further facilitated and the productivity is improved. Further, if this middle plate is used, it becomes easier to unitize the die set and the punch set in the outer setup.

  In this case, the connecting rod of any punch set may be fixed to the middle plate. With this configuration, for example, it is possible to provide a press machine that does not drive the first punch among a plurality of punches. Further, a configuration in which a plurality of punches are not driven may be employed.

  Also, the connecting rod of one punch set is fixed to the middle plate, and the piston rod for punching to which the connecting rod is fixed is fixed by the connecting rod of the die set and the fixture through the connecting plate. Also good. If it does in this way, it can be set as the structure which does not play the cylindrical cylinder for punches fixed. For example, if there is one die at the top, three punches (fixed one step), and one core rod, the central cylinder may be one step and the cylindrical cylinder may be three steps. In this configuration, since the die is driven by the cylindrical cylinder, a lower cylinder provided under the base plate is not necessary, and there is no need to dig up the ground for the lower cylinder. Therefore, the overall height of the press machine can be further shortened to provide a press machine that is easy to install. Moreover, the extraction force and tensile strength of the molded product that drives the die downward can be solved by increasing the piston rod on the annular piston of the cylindrical cylinder. This is only achieved by the structure of the present invention where the piston rod can be easily increased.

  These punch plates may include a guide hole through which a connecting rod connected to another plate is inserted. Thus, if each punch plate is provided with a guide hole, unitization of the die set and punch set in the outer setup is further facilitated. For example, if there is one die at the top and three punches, the connecting rod of the die set is placed in the guide hole of the first punch plate installed next to the die plate, and the connecting rod of the first punch plate is The connecting rod of the second punch plate is inserted into the guide hole of the second punch plate arranged next to the first punch plate, and the connecting rod of the second punch plate is inserted into the guide hole of the third punch plate arranged next to the second punch plate. This makes unitization easier.

  According to the present invention, since the pressure receiving cylinder mechanism is a cylindrical cylinder, it is possible to arrange on the base plate without stacking the cylinders in the height direction even if the punches are multi-staged. can do. In addition, each cylinder is provided in a one-to-one relationship with a plurality of punches so that it is cylindrical and concentrated at the same location, so that it is easy to concentrate the resultant force of the load load on the pressure receiving center. It is possible to improve the controllability of the press forming operation performed through the process.

  By connecting the cylindrical cylinder provided in the press machine body with the unitized die set and punch set, that is, by changing the connection structure in the connection plate, it is possible to make the structure of the lower cylinder unnecessary. There is no need to dig up the ground for the cylinder, and the overall height of the press machine can be further shortened to provide a powder molding press machine that is easy to install.

  In addition, since each cylinder provided from the inside to the outside surrounding the central cylinder has a cylindrical structure, any number and any number of pistons and piston rods can be arranged, so that the degree of freedom in design is increased. The amount of stress deformation in the cylindrical cylinder can be greatly suppressed as much as possible. On the other hand, since the connecting plate is provided and the cylindrical cylinder as the pressure receiving cylinder mechanism and the unitized die plate and punch plate are separated from each other, each can be designed separately. As a result, the connecting rod connected to the die plate and the punch plate can be widened in design freedom in terms of thickness and length, so that the amount of stress deformation can be suppressed as much as possible on the die set side. In addition, with this separation structure, when changing the molded product, the die and punch can be replaced by external setup without disassembling the pressure-receiving cylinder mechanism, and the setup time can be greatly shortened to increase productivity. Can be improved.

  Furthermore, since the hydraulic cylinders are not stacked in a coaxial series, the length of each component can be shortened and increased, and a press machine with less bending and stress deformation can be provided. As a result, it is possible to reduce correction value input for deformation of each component in servo control (numerical control), so that it is easy to improve controllability.

  Furthermore, if the control device for servo control is attached to the connecting plate instead of the die or punch, the re-installation, re-piping and re-wiring of the control device associated with the change of the molded product is not required. Is easy to launch. Accordingly, there is no need to install position detecting means for each of the components and each cylinder as in Patent Document 1, so that it is possible to eliminate duplication of control devices in the servo system and greatly reduce costs. Can be provided.

  Embodiments according to the present invention will be described below with reference to the accompanying drawings. In Examples 1 to 4, a die set and a pressure receiving mechanism using a lower punch corresponding to a three-step molded product will be described. In the following description, the pressure receiving cylinder mechanism is described as a hydraulic press among the hydraulic presses, but the mechanism may be other hydraulic presses or a pneumatic press made of a gas such as air. That is, 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 for attaching a die 10 and a connecting rod 21a connected to the die plate 20a, and first to third punch plates for attaching lower first to third punches 11, 12, and 13. 20b, 20c, 20d and punch sets 2b-2d comprising connecting rods 21b, 21c, 21d connected to the first to third punch plates 20b, 20c, 20d, and a cylinder 4a as a pressure receiving cylinder mechanism provided on the base plate 3 It is a partial longitudinal cross-sectional view of the powder molding press machine 1 which connected -4d (4a is a center cylinder, 4b-4d is a cylindrical cylinder), and the lower cylinder 5 via the connection plates 6a-6d. 2 is a cross-sectional view taken along line AA in FIG. 1, FIG. 3 is a cross-sectional view taken along line BB in FIG. 1, and FIG. 4 is a perspective view of the powder forming press machine according to the first 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 of 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. Hereinafter, Example 1 is explained in full detail based on these FIGS.

  First, the center cylinder 4a, the cylindrical cylinders 4b to 4d, and the lower cylinder 5 as pressure receiving cylinder mechanisms will be described. As shown in FIGS. 1 and 2, the pressure receiving cylinder mechanism is configured such that the central cylinder 4a stands on the base plate 3 so as to form a core piston 41a that connects the core rod 14 and a working chamber that drives the core piston 41a. An annular wall 40b to which the cylindrical cylinders 4b to 4d are erected on the base plate 3 at a predetermined interval so as to surround the central cylindrical wall 40a of the center cylinder 4a. 40d, an annular piston 41b to 41d driven with the inner space surrounded by the annular walls 40b to 40d as a working chamber, and a piston standing on the annular piston 41b to 41d and connected to the connecting plates 6a to 6c Rods 42a to 42c, and the pistons of the core piston 41a of the center cylinder 4a and the cylindrical cylinders 4b to 4d. And a sealing lid 43 for sealing and the working chamber is passed through the rod 42a~42c airtight or liquid-tight state.

  The central cylindrical wall 40a and the annular walls 40b to 40d are arranged on the base plate 3 such that the central cylindrical wall 40a is arranged in the center, and the annular wall 40b having a diameter larger than that of the central cylindrical wall 40a is concentrically arranged. Large annular walls 40c are arranged concentrically, and annular walls 40d having a diameter larger than the annular wall 40c are arranged concentrically. Then, a core piston 41a for reciprocating the core rod 14 is built in 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. Annular pistons 41b to 41d for reciprocating the first to third punches 11 to 13 are incorporated. Each piston 41a-41d is provided with a seal member 45 to seal the pressure oil for driving the piston. In this embodiment, the center cylinder 4a and the cylindrical cylinders 4b to 4d are arranged concentrically so that the resultant force of the load is concentrated on the pressure receiving center.

  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, in this embodiment, as shown in FIG. 2, a plurality of piston rods 42 a to 42 c are spaced apart from each other in the circumferential direction by the respective annular pistons 41 b to 41 d, and are arranged radially in the cross section. 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 upper portion loaded via the upper punch at the time of pressure molding. A structure with little stress deformation with respect to the load from the cylinder is realized. The number, arrangement, and structure of the piston rods are appropriately changed in design from the relationship between the press machine forming ability and pressure receiving ability. The core piston 41a may be divided into a core piston and a core piston rod connected to the core piston, similarly to the pistons 41b to 41d and the piston rods 42a to 42c of the cylindrical cylinders 4b to 4d. .

  The sealing lid 43 is provided with holes through which the core piston 41a and the piston rods 42a to 42c protrude. The core piston 41a and the piston rods 42a to 42c are protruded so as to sandwich the entire cylinder together with the base plate 3 and liquid. The cylinders 4a to 4d sealed in a dense state are configured. Seal housings 44a to 44d are provided on the sealing lid 43 to seal between the core piston 41a, the piston rods 42a to 42c and the outer end surfaces of the cylinders 4a to 4d. Further, 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 similarly, a piping port 46 b is provided in the base plate 3. That is, when the core piston 41a and the piston rods 42a to 42c are driven 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 also 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 lower cylinder 5 does not need to be provided directly on the lower surface of the base plate 3, and may have a separate configuration as shown in FIG. 10 of the fourth embodiment described below.

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

  In FIG. 3, the connecting plates 6a to 6c have an annular shape whose diameter increases toward the outer side, and the outermost connecting plate 6d has a rectangular shape. However, this shape may be arbitrary. That is, all of the connecting plates may be circular, rectangular, or oval, or a combination thereof. Further, connection recesses 60a to 60c and connection holes 60d for fixing the connection rods 21a to 21d of the unitized die set 2a and punch sets 2b to 2d described below are provided on the upper surfaces of the connection plates 6a to 6d. Yes. 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.

  The pressure receiving cylinder mechanism described above is provided in a configuration that is mounted on the base plate 3 of the press machine 1 main body.

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

  The die set 2a and the 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 to the connecting rods 21a to 21d. Are connected by screws 22, the connected connecting rods 21 a to 21 c are inserted into guide holes 23 b to 23 d provided in the first to third punch plates 20 b to 20 d, and the connecting rods 21 a to 21 d are further connected to the middle plate 7. Are inserted into the guide holes 7a to 7d and unitized by external setup. Accordingly, the connecting rod 21a of the die plate 2a is inserted into the guide hole 23b of the first punch plate 20b and the guide hole 7a of the middle plate 7, and the connecting rod 21b of the first punch plate 20b is inserted into the guide hole 23c of the second punch plate 20c. The connecting rod 21c of the second punch plate 20c is inserted into the guide hole 23d of the third punch plate 20d and the guide hole 7c of the middle plate 7, and is connected to the connecting hole of the third punch plate 20c. 21 d is inserted into the guide hole 7 d of the middle plate 7. Note that the die set 2a and the punch sets 2b to 2d in FIG. 1 are based on the center line, and the right side shows the insertion relationship between the connecting rods 21a to 21c and the guide holes 23b to 23d, and the left side shows the plates 20a to 20d and the connecting rods. Since the connection relationship by the screw 22 of 21a-21d is shown, it is not described as a symmetrical figure. However, it is actually a symmetrical configuration. The same applies to FIG.

  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, in the portions of the connecting rods 21a to 21d fixed to the connecting plates 6a to 6d, the fixing tools fitting grooves 24a to 24d having a circumferential groove shape, for example, into which the fixing tools 62a to 62d (see FIG. 3) are fitted are recessed. It is installed. Accordingly, the fixture 62a is fitted into the fixture fitting groove 24d, the fixture 62b is fitted into the fixture fitting groove 24c, the fixture 62c is fitted into the fixture fitting groove 24b, and the fixture 62d is fitted into the fixture fitting groove 24a. The rods 21a to 21d are fixed to the connecting plates 6a to 6d.

  In FIG. 1, the die 10 and the lower first to third punches 11 to 13 are connected to the die plate 20a and the first to third punches by adapters such as a die retainer 9a, a die holder 9b, a punch retainer 9c, and a punch receiving plate 9d. Set on punch plates 20b-20d.

  The die set 2a and the punch sets 2b to 2d described above are configured as an external setup separately from the pressure receiving cylinder mechanism to be unitized.

  The assembling operation for connecting the cylindrical cylinders 4b to 4d and the lower cylinder 5 as the pressure receiving cylinder mechanism and the punch sets 2b to 2d and the die set 2a starts with the die set 2a and the punch set 2b unitized by external setup. Place the ~ 2d middle plate 7 on the middle plate support 8. The middle plate support 8 is provided at a height that allows the middle plate 7 to be positioned between the third punch plate 20d and the connecting plates 6a to 6d, and an L-shaped slide portion on which the middle plate 7 is slid. 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 a slide portion 8a appropriately provided on the middle plate support base 8, and is installed by sliding it. good. When the middle plate 7 is installed on the middle plate support 8 in this way, the guide holes 7a to 7d come to the upper positions corresponding to the coupling recesses 60a to 6c and the coupling holes 60d of the coupling plates 6a to 6d. The core piston 41a of the center cylinder 4a is inserted through the guide hole 7e.

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

  The fixtures 62a to 62c are fixed by bolts 63 on the upper surfaces of the connection plates 6a to 6c, while the fixture 62d is fixed by bolts 63 on the lower surface of the connection plate 6d. Although the connecting rod 21a of the die set 2a to which the die 10 is attached may be fixed on the upper surface side of the connecting plates 6a to 6c in the same manner as the connecting rods 21b to 21d of the punch sets 2b to 2c to which the punches 11 to 13 are attached. Since the pulling force of the lower cylinder 5 with respect to the die 10 acts greatly downward, and a tensile force is generated in the connecting rod 21a of the die set 2a to which the die 10 is attached, the fixture of the connecting rod 21a portion protruding from the lower surface of the connecting plate 6d. If the fixing tool 62d is fitted in the fitting groove 24a and fixed with the bolt 63 from the lower surface, the structure can withstand the extraction force of the lower cylinder.

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

  5 to 7 show various molding steps of the molded product by the powder molding press machine 1 of FIG. That is, FIG. 5 shows a filling process, FIG. 6 shows a pressurizing process, and FIG. 7 shows an extraction process.

  In the filling process of FIG. 5, the upper punch 15 is raised by an upper cylinder (not shown), and the die 10 and the core rod 14 are in accordance with each filling method such as volume filling (drop filling or suction filling), overfill system, underfill system, and the like. The lower first to third punches 11 to 13 are driven and controlled by the lower cylinder 5, the central cylinder 4a and the cylindrical cylinders 4b to 4d to be raised to the filling position, and the inside of the die 10, the core rod 14 and the lower first to first punches The powder 16 is filled in the filling space formed between the third punches 11-13. In this case, the reference for positioning the die and each punch is the lower third punch 13.

  In the pressurizing step of FIG. 6, the upper cylinder 15 is driven to lower the upper punch 15 and pressurize the powder 16 together with the die 10, the lower first to third punches 11 to 13, and the core rod 14. In this case, the lower first to third punches 11 to 13 receive a load from the upper punch 15. Therefore, the annular pistons 41b to 41d transmit the load received by the lower first to third punches 11 to 13 through the punch sets 2b to 2c and the piston rods 42a to 42c, and are at the pressurization position shown in FIG. Receives a load. Further, since the side pressure of the downward component is applied to the die 10 and the core rod 14 by the upper punch 15, a downward load load is also transmitted to the lower cylinder 5 and the core piston 41a, and the die piston 51 as shown in FIG. The core piston 41a comes to an equilibrium position between the load and the oil pressure.

  7, the upper cylinder 15 is driven to raise the upper punch 15, the lower cylinder 5 lowers the die 10, and the core rod 14 is lowered by the center cylinder 4 a to extract the green compact 17. . At that time, the lower first punch 11 and the lower second punch 12 are lowered by the cylindrical cylinders 4b and 4c. The lower third punch 13 is not driven and serves as a reference for the extraction position.

  The central cylinder 4a, cylindrical cylinders 4b to 4d, and the lower cylinder 5 are driven by servo control (numerical control). In this case, a control device for servo control is attached to the connection plates 6a to 6d. In addition, also in the following Examples 2 to 4, the basic molding process of the powder molding press machine is the same, and thus the description thereof is omitted.

  FIG. 8 shows an unnecessary embodiment of the lower cylinder. In FIG. 8 as well, the components arranged radially are projected onto the center line as in FIG.

  In Embodiment 2 that does not require a lower cylinder, the punch set 2b for attaching the lower first punch 11 is fixed to the middle plate 7, and the cylindrical cylinder 4d used for the punch set 2b is driven by the die set 2a for attaching the die 10. It is used for. That is, the piston rod 42c of the cylindrical cylinder 4d and the die set 2a are connected via the connecting plate 6d. Further, a large number of piston rods 42c are arranged on the annular piston 41d so as to cope with the pulling 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 this embodiment, a large number of piston rods 42c are arranged on the annular piston 41d so as to withstand the pulling force of the die 10. This can be realized by the structure of the present invention in which the cylinder is cylindrical and the piston rods are arranged on the annular piston in any number and at any position, that is, the number can be appropriately increased or decreased as necessary, and can be properly arranged. is there. Since this configuration eliminates the need for the lower cylinder, it is not necessary to dig up the ground for the lower cylinder, the installation is easy, and the overall height of the powder molding press machine 1 can be shortened.

  Since other configurations are the same as those in FIG. 1, the description and the reference numerals of the drawings are omitted. In this embodiment, the punch set 2b of the lower first punch is fixed to the middle plate 7, but a die set of another lower punch may be fixed.

  FIG. 9 shows another embodiment that does not require a lower cylinder. In FIG. 9 as well, the components arranged radially are projected onto the center line as in FIG.

  In another embodiment 3 that does not require the lower cylinder, the center cylinder is one stage, the cylindrical cylinder is formed in four stages, and the die set 2a to which the die 10 is attached and the punches to which the lower first to third punches 11 to 13 are attached. All of the sets 2b to 2d are connected to the cylindrical cylinders 4b to 4e. The cylindrical cylinder 4e is erected so as to surround the annular wall 40e with respect to the central cylindrical wall 40a at a predetermined interval, and has an internal space enclosed by the annular wall 40e as a working chamber and incorporates an annular piston 41e. A plurality of piston rods 42d are erected on the annular piston 41e, and are sealed with a sealing lid 43 in a liquid-tight state. The third embodiment is different from the second embodiment in that the piston rod 42d of the cylindrical cylinder 4e and the die set 2a to which the die 10 is attached are connected by the connecting plate 6d. Since the piston rod 42d is used to drive the die 10, a large number of piston rods 42d are provided on the annular piston 41e as in the second embodiment. Since this structure eliminates the need for the lower cylinder, the powder molding press machine 1 can be easily installed and its overall height can be shortened. Since other configurations are the same as those in FIG. 1, the description and the reference numerals of the drawings are omitted.

  FIG. 10 shows an embodiment in which a cylindrical cylinder as a pressure receiving cylinder mechanism and a die set are integrated. In FIG. 10 as well, the components arranged radially are projected onto the center line as in FIG.

  In the fourth embodiment in which the cylindrical cylinder and the die set are integrated, the punch sets 2b to 2d to which the first to third punches 11 to 13 are attached and the cylindrical cylinders 4b to 4d are directly fixed to the connecting plates 6a to 6c. The die set 2 a to which the die 10 is attached is directly fixed to the die piston 52 of the lower cylinder via the die piston head 53. Accordingly, the middle plate 7, the middle plate support base 8, the connecting plate 4d, the movable rod 52, the fixtures 62a to 62d, the bolts 63, etc. shown in FIG. 1 are unnecessary, and the powder molding press machine has a more compact and simple structure. 1 can be provided. Since other configurations are the same as those in FIG. 1, the description and the reference numerals of the drawings are omitted. The lower cylinder of the present embodiment is not provided with a cylinder mechanism on the lower surface of the base plate 3 as shown in FIG. 1, but is driven by a separate lower cylinder (not shown) as shown in FIG. The integrated structure of this embodiment can also be applied to the second and third embodiments.

  When the molding capability of the powder molding press machine in Examples 1 to 4 is 2000 [kN], the die extraction capability is 800 [kN], and the total pressure receiving capability of the lower first to third punches is 1 of the molding capability. About 5 to 2 times are required, so that the pressure receiving capacity is 1400 [kN] for the lower first punch, 1400 [kN] for the lower second punch, It is about 800 [kN] with respect to the punch. Therefore, the size of the press machine of Example 1 is that the width of the cylinder is within 1000 [mm] when the piston stroke of each cylindrical cylinder is about 150 [mm] and the operating oil pressure is 20 [Mpa]. Since the height of the cylinder including the cylinder is 1500 [mm] and the height of the die set is about 1500 [mm], the total height can be kept below 3000 [mm]. If the configuration of the press machine disclosed in Patent Document 1 is taken under the same conditions, the total height reaches 4000 [mm]. Therefore, it can be confirmed that the powder molding press machine of the present invention has been significantly downsized without reducing the pressure receiving capability of multistage molding.

  In the press machines according to the second and third embodiments, the die is driven by the cylindrical cylinder, and the lower cylinder is unnecessary. Therefore, the height of the cylindrical cylinder including the base plate should be 1000 [mm] or less. it can. As a result, the top surface height of the die, that is, the working surface height can be greatly reduced compared to the conventional general powder forming press machine, and it is not necessary to dig the installation pit for the lower cylinder. Installation of the machine becomes easy. Further, the cost of the entire machine can be reduced by reducing the number of elements required for the configuration of the press machine.

  In the press machine of Example 4, since the cylindrical cylinder and the die set are integrated, the components for installing the die set, such as the middle plate, as in Examples 1 to 3, are not necessary, and thus integrated. The height of the cylindrical cylinder and the die set can be about 2500 [mm]. This is the same size as that of the conventional mechanical stopper type.

  Although the powder forming press machine related to the lower punch has been described above, the structure can be transferred as it is even when the upper punch is multi-staged.

1 is a partial longitudinal sectional view of a powder forming press machine according to Embodiment 1 of the present invention. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. BB sectional drawing of FIG. 1 is a perspective view of a powder molding press machine according to Embodiment 1 of the present invention. The longitudinal cross-sectional view of the powder molding press machine which concerns on Example 1 of this invention which showed the filling process among the shaping | molding processes of a molded article. BRIEF DESCRIPTION OF THE DRAWINGS FIG. The longitudinal cross-sectional view of the powder molding press machine which concerns on Example 1 of this invention which showed the extraction process of a shaping | molding process. The longitudinal cross-sectional view of the powder molding press machine which concerns on Example 2 of this invention. The longitudinal cross-sectional view of the powder molding press machine which concerns on Example 3 of this invention. The longitudinal cross-sectional view of the powder molding press machine which concerns on Example 4 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Powder forming press machine 2a Die set 2b-2d Punch set 3 Base plate 4a Center cylinder 4b-4e Cylindrical cylinder 5 Lower cylinder 6a-6d Connection plate 7 Middle plate 7a-7e Guide hole 8 Middle plate support stand 8a Slide part 9a Die Presser 9b Die holder 9c Punch holder 9d Punch receiving plate 10 Die 11 Lower first punch 12 Lower second punch 13 Lower third punch 14 Core rod 15 Upper punch 16 Powder 17 Molded product 20a Die plates 20b to 20d Punch plates 21a to 21d Connecting rod 22 Screw 23b-23d Guide hole 24a-24d Fixing tool fitting groove 40a Central cylindrical wall 40b-40e Annular wall 41a Core piston 41b-41e Annular piston 42a-42d Piston rod 43 Sealing lid 44a-44d Sealing h Uzing 45 Seal member 46a to 46d Piping port 50 Die cylinder wall 51 Die piston 52 Movable rod 53 Die piston head 60a to 60c Connection recess 60d Connection hole 61 Guide holes 62a to 62d Fixing tool 63 Bolt

Claims (9)

In a powder molding press machine in which a core rod is arranged in the center with a die as the outermost shell, and two or more punches having different diameters are juxtaposed between the die and the core rod to perform press molding
Comprising: a die set comprising a connecting rod which is connected to the die plate and the die plate for mounting the die and a plurality of punches set of connecting rods connected to the punch plate and the punch plate mounting said plurality punches respectively, the and, a plurality of different tubular cylinder diameters surrounding the central cylinder and said center cylinder which is connected to the core rod is disposed on the base plate, their these tubular cylinder at least the plurality punch sets each of the connecting rod Are connected via corresponding connecting plates, and the central cylinder and the cylindrical cylinder are driven by fluid pressure, and the central cylinder drives a core piston that connects a core rod and the core piston. Center circle standing on the base plate to form a working chamber Comprising a wall, also each of the plurality of tubular cylinder has an annular wall which is erected on the base plate by a central cylindrical wall of the central cylinder to as to surround with a predetermined interval, in the annular wall surrounded by an annular piston which is driven internal space as the working chamber has become comprises a plurality of piston rods which are respectively concatenated to the connecting plate while being erected is Hanare設mutually annular piston arrangement And a sealing lid that allows the core piston of the central cylinder and the piston rods of the plurality of cylindrical cylinders to pass through in an air-tight or liquid-tight state and seals the working chambers. Press machine. The punch set connecting rod of the powder molding press machine according to claim 1 which is fixed by the fixing device is inserted into the connecting recess of the corresponding connection plate. Connecting rod of the die set, powder molding press machine according to claim 1 or claim 2 is connected to the die provided under the base plate to the connecting plate connected to the lower cylinder to reciprocate. The powder forming press machine according to claim 1 or 2 , wherein the connecting rod of the die set is also connected to the cylindrical cylinder via a corresponding connecting plate. The powder forming press machine according to claim 3 or 4, wherein the connecting rod of the die set is inserted into a connecting hole of a corresponding connecting plate and fixed by a fixture. A middle plate having a guide hole for inserting the core piston and guiding the connecting rod of the die set and the punch set to guide the connecting recess and the connecting hole of the connecting plate; and the middle plate provided on the base plate, The powder molding press machine according to any one of claims 2 to 5 , further comprising: a middle plate support that positions the plate closer to the cylindrical cylinder than the punch plate to which the innermost punch is attached. . The powder forming press machine according to claim 6 , wherein a connecting rod of any of the punch sets is fixed to the middle plate. Connecting rod of one punch set is fixed to the middle plate, the piston rod of the punch which the connecting rod is fixed, connecting plate according to claim 7, wherein fixed in the connecting rod and the fastener die set through Powder molding press machine. The powder forming press machine according to any one of claims 1 to 8 , wherein the punch plate includes a guide hole through which a connecting rod connected to another plate is inserted.

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