JPS60162597A - Powder molding press - Google Patents

Abstract

PURPOSE:To set exactly, simply and easily the operation timing of a stopper mechanism and the descending timing of a lower ram by an oscillating lever by attaching a mechanism for releasing the stopper to a base flange fixed to the lower ram. CONSTITUTION:When an ejector rod 28 descends by one step further, an operating rod 41 is pressed downward by the operating projection 42 at the bottom end of the rod 28 by which a bell crank 35 is turned clockwise. A stopper arm 35a and a stopper 34 are both turned clockwise to be released from a stopper receiver 37. When the rod 28 is further lowered thereafter, the bottom end of the rod 28 contacts with the roller 49a at the top end of the ejector arm 49 of an oscillating lever 45 thereby depressing the same. A lower ram 17 is then depressed down to the bottom dead point via a base flange 20. When a pull-down plate 9 connected to the ram 17 is lowered by one step further, the ejection of a molding W is completed at the point of the time when the top surfaces of a die 12 and a core rod 15 are made flush with the top surface of a lower punch 14.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention involves filling a predetermined mold (cavity) with metal powder, etc., and compressing the powder into a predetermined shape through a process of pressurization and extrusion. This invention relates to a powder molding press for molding.

(Prior art) In general, in a powder molding press, it is important to produce a good molded product with a simpler mechanism and operation. It is necessary to extrude this molded product from within the die while preventing cracking.

As a conventional powder molding press of this kind, for example, the
There is one as shown in the L-47442 publication. In this publication, a compression cam and an extrusion cam are separately provided on the main shaft that operates the upper punch, and a lower ram connected to the die is provided with a swing lever in the center so that the lever can swing. At the same time, individual rods are interposed between each cam provided on the main shaft and each end of the swing lever,
Further, a swingable bell crank is provided at the center of one end of the swing lever, and a stop horn 9 is swingably provided at the center of the swing lever, so that one arm of the bell crank and the arm of the stop horn are provided in a swingable manner. The retaining piece is connected with a connecting rod to form a crank mechanism, and at the end of the pressurizing process, one end of the swinging lever is fixed with one rod, and the other rod is used to connect the dowel crank to the swinging lever. The other end of the swinging lever is rotated using the pivot point as a fulcrum to release the stone, and then the other rod is used to rotate the swinging lever using its fixed end as a fulcrum to move the center of the swinging lever. A powder molding press has been disclosed in which a molded product is extruded by pushing down a lower ram connected to the powder molding press. Therefore, it is extremely difficult to accurately position and timing the bell crank's activation timing using the rod and when fixing one end of the swing lever. There is a problem in that the attachment must be performed with high precision, which makes manufacturing complicated and increases manufacturing costs.

(Objective of the Invention) This invention was made by focusing on such conventional problems, and a stopper release mechanism such as a bell crank is directly attached to the pace flange fixed to the lower 2mm, and
The swing lever is rotatably supported on a fixed member such as the machine frame so that the pivot point is always fixed without movement, and the timing of the stopper release mechanism and the lowering of the lower ram by the swing lever are controlled. It is an object of the present invention to provide a powder forming press that is easy to manufacture and inexpensive to manufacture, which allows accurate timing settings to be easily performed.

(Structure of the Invention) In order to achieve the above object, the present invention has a bell crank or the like which is attached to the pace flange fixed to the lower ram, and which is operated via a rod by a cam on the main shaft. A swing lever that presses the ram downward is rotatably supported on a fixed member such as a machine frame.

(Example) The present invention will be explained below with reference to the illustrated example.
6 to 6 show the structure and operation of the powder molding press according to the present invention.
A main shaft 3, which is a crankshaft, is rotatably supported through the main shaft 3, and the main shaft 3 is rotatably driven by a drive source (not shown) through a reduction gear mechanism (not shown) or the like. There is.

An upper 2-piece shaft is connected to a crank pin 3a of the main shaft 3 via a holder 4 and a pitman screw 5 so as to be able to move up and down.

S is a guide set, and this guide set S is fixedly connected to the upper punch 8 fixed to the upper ram 6 via a punching plate 7, a pull-down plate 9, and a rod 10. Fixed Grate 1 on Frame 1
3, and a core rod 15 provided on the lowering grate 9. - A lower ram 17, which is slidably supported in the vertical direction on the machine frame 1, is connected to the lowering grate 9 via a screw connection part 18, and a lower ram 2 fixed to the lower ram 17 is connected to the lower ram 17, which is slidably supported vertically on the machine frame 1.
0 is connected to filling cylinders 21, 21, and the operation of these filling cylinders 21, 21 allows the lower 2mm 17 to be raised and lowered via the spacer flange 2o.

A regular cam 23 and an extrusion cam 24 having mutually different phases are provided at both ends of the main shaft 30, and the compression cam 23 and extrusion cam 24 are supported by the machine frame 1 so as to be slidable in the vertical direction, and are supported by a spring member 25. The compression rod 27 and the rollers 29 and 30 at the upper end of the extrusion rod P28, which are urged upward by 26 (Figs. suppressed and descended to The compression rod 27 is divided into an upper rod 27a and a lower rod 27b, and the upper end of the lower rod 27b shows the entire length of the compression rod 27 when it comes into contact with the lower end of the upper rod 27a, that is, the length of the compression rod 27. An adjusting member 31 for adjusting the lower limit is screwed on.

A stopper 34 and a bell crank 35 are pivotally supported on the pace flange 20 fixed to the lower ram 17, and the stopper 34 and the bell crank 35 are pivotally supported.
-34 and one arm of the bell crank 35, that is, the end of the stopper deme 35a, are connected to each other by a connecting rod 36 to form a parallel link mechanism. At the bottom of the machine frame 1, there is a stopper 34 and a stone 9-arm 3.
A pair of strut horns 9-receiver 37.3 facing each tip of 5a
7 are provided respectively, and these stopper receivers 37, 37
When the stopper 34 and the stopper arm 35a are in the operating position, the tips of the stopper 34 and the stopper arm 35a come into contact with each other, and the lower ram 17
prevent the descent of

A return spring 38 is connected between the stopper arm 35 & of the bell crank 35 and the pace 7 runzo 20, and the return spring 38 causes the bell crank 35 to move to its pivot point 3.
It is rotated 5p times and biased to the stopper operating position. In addition, in the support cylinder 40 provided on the upper surface of the pace 72 engine 20 close to the other arm 35b of the bell crank 35,
An operating rod 41 is supported slidably in the vertical direction, and this operating rod 41 is connected to the other arm 3 of the bell crank 35 at its lower end.
5b, and is disposed at the upper end to face an actuating protrusion 42 that protrudes laterally from the lower end of the extrusion rod 28, and as the extrusion rod 28 descends at the start of the extrusion process, the actuating protrusion 42 42 presses down the operating rod 41, and rotates the bell crank 35 about its pivot point 35p@b in the clockwise direction in FIG. It is now possible to cancel the bond. Here, the operating protrusion 4
2. The operating rod 41 and the bell crank 35 constitute the stopper release mechanism R of the present invention.

Further, as shown in FIG. 1.2, bearings 44 and 4 are mounted on the machine frame 1 at the upper position of the lower gym 170 and the pace flange 20.
Swing lever 4-5 which is a torsion lever via 4
is rotatably supported, and the base 45 of this swing lever 45
Two support arms 46.47 extend parallel to each other with a distance from each other from the middle part of the support arm 46.47, and a pair of rollers 46a, 47 are mounted at the tips of these support arms 46.47 with the lower ram 17 in between.
a is pivotally supported, and the rollers 46a and 47a are in contact with the upper surface of the base flange //20. Further, the compression arm 48 and the push-out arm 49 extend from both ends of the base 45a of the swing lever 45, and the upper part of the row 248a, which is pivotally supported at the tip of the compression arm 48, comes into contact with the lower end of the compression rod 27. The lower part faces the upper surface of the base flange 20, and the intermediate part of the extrusion arm 49 has a relatively large diameter whose upper part faces the lower end of the extrusion rod 28 and whose lower part faces the upper surface of the pace 72 20. A wide row 249a is pivotally supported at the tip of the extrusion arm 49, and a relatively small stone a4-5Q (Fig. A fourth roller 49b is pivotally supported, and the upward rotational position of the second moving lever 45 is regulated by engagement between the roller 49b and a stopper 50.

In addition, the shape of the compression cam 23 and the extrusion cam 24 provided on the main l1ill13 is such that the compression rod 2
7 and extrusion rod 28 are preset to perform the operations shown in FIG. That is, FIG. 7 is a stroke diagram showing the movements of the upper punch 8, die 12, compression rod 27, and extrusion rod 28 in the powder molding process.The upper punch 8 is lowered along the A curve by the upper ram 6. When the upper nokunchi 8 is inserted into the die 12, the powder in the die 12 is pre-compressed. After the start of pre-pressure, the compression lot °27 is moved to the upper patch 8 as shown in line B.
It starts to descend as the temperature decreases. After the pre-compression, the die 12 also moves down along line B as shown by line C, during which compression is performed, and the pressurization is completed at the point where the die 12 falls.

After the above-mentioned pressurization is completed, the upper punch 8 begins to rise, and then at point C, the extrusion rod 28 descends along the ID, and the release of the stopper mother 34 and stopper arm 35a begins, and at point d, the stopper'? -34 and the release of the stopper arm 35a is completed, extrusion is started at 1 point eK. In addition, in the process from the pressurized photon at point f to the end of extrusion at point f, the compression rod 27 is held in a lowered state, and even if the upper nokunchi 6 rises, the rise of the die 12 is prevented. There is. Extrusion opening t at point e
&He dice 12 descends one step as shown by line C and reaches point f.
Extrusion is completed at . At this time, the extrusion rod 28 also descends together with the die 12' as shown in ID.

3 to 5 show the powder molding press at the compression end position in FIG. The arm 48 is pressed to rotate the swing lever 45 downward to the pivot point.

At this time, the compression μrad 27 is maintained in a lowered state during the stroke from the end of pressurization to the end of extrusion, and presses down the lower ram 17 via the swing lever 45, so that the upper 4-inch inch 8 rises. However, the rise of the dice 12 is completely blocked.

Figure 6 shows the powder forming press at the end of extrusion @1 in Figure 7, where the extrusion rod 28
When the lever is further lowered by one step, the operating rod 41 is pressed downward by the operating protrusion 42 at the lower end of the push rod 28, which causes the bell crank 35 to move to its pivot point 3s p@b.
In Fig. 6, it is rotated clockwise and the A! - Rotate the arm 35a and the OXX trapper 3 clockwise around their pivot points 35p and 34p to release them from the stopper receiver 37°37. After that, extrusion rod 2
8 is further lowered, the lower end of the extrusion rod 28 comes into contact with the mouth 249a at the tip of the extrusion arm 49 of the swing V bar 45 and pushes it down, thereby pushing the lower ram through the spacer flange 20. 17 is pushed down to the bottom dead center.

When the pull-down plate 9 connected to the lower ram 17 is lowered one more step in this way, the gou plate 11 and the core rod 15 are lowered together, and the die 12
When the upper surface of the core rod 15 becomes flush with the upper surface of the lower Al punch 14, extrusion of the molded product W is completed. Thereafter, when the die 12 and the extrusion rod 28 start to rise to their original positions, the stopper 34 and the bell crank 35 are also returned to their original positions by the return screw 38.

(Effects of the Invention) As described above, according to the present invention, a stopper release mechanism such as a bell crank is fixed to the lower ram and attached to the head flange, and is actuated by the cam on the main shaft via the rod to move the lower ram downward. Since the swinging lever to be pressed is rotatably supported on a fixed member such as the machine frame, the swinging fulcrum of the swinging lever can always be fixed, and the activation timing of the stone/arm release mechanism, that is, the stopper The release timing and the lower ram lowering timing using the swing lever can be set easily and easily, so extremely high precision is not required in processing and assembling each member.
El! It is possible to make the process easier and to reduce the manufacturing cost. In addition, the pace flange can be used as a stand for mounting work tools and workpieces, and other accessories can also be installed there, making it very convenient during work or when moving the press.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional view of the powder forming press at the filling position. Figure 2 is a sectional view taken along the line ■-■ in Figure 1, Figure 3 is a longitudinal cross-sectional view of the powder molding press at the compression completion position, Figure 4 is a left side view of the powder molding press in Figure 3, and Figure 5. is a right side view of the powder forming press shown in Fig. 3, Fig. 6 is a vertical cross-sectional side view of the powder forming press at the extrusion completion position, and Fig. 7 shows the upper 4-inch, die, compression rod, and It is a stroke diagram showing the relative positional relationship of extrusion rods. 3...Main shaft, 12...Dice, 17...Lower 2 mm,
20... Pace flange, 23.24... Compression cam and extrusion cam as a cam, 27.28... Compression rod and extrusion rod as a cam, 45... Swing lever, R...・Stotsuno+-Release am. Patent applicant: Yoshitsuka Seiki Co., Ltd.

Claims (1)

[Claims] A base flange is integrally provided on the lower ram which is operatively connected to the die, and above the base flange is a swinging lever that is in contact with a rod operated by a cam on the main shaft and presses the lower ram downward. In addition to rotatably dispensing the
A powder molding press characterized by having a stopper and one-release mechanism attached to the base flange itself.