JPH0356605A - Device for taking out green compact in sizing press - Google Patents

Abstract

PURPOSE:To execute sure takeout of a green compact without opening a lower punch by arranging means for holding correcting finish green compact taken out with a lower punch from die hole for correction. CONSTITUTION:The green compact S is pressurized into the die hole H for correction with the upper and lower punches 5, 10 to execute sizing. An upper punch plate 4 is driven upward, and by ascending a lower plate, too, a first takeout i.e. the correcting finish green compact S positioned on the lower punch 10 is pushed up on a die plate 2, is executed. At the time of working a fluid cylinder 30 in a pressing mechanism 22, a clamper 21 is shifted to the arrow mark A direction according with sending-out of a feed bar 31. Pusher rollers 28a are run onto inclining part 27a in a pusher 27, and only during running in the distance L, the green compact S is pressed. This pressed force is transferred to a jig 23, and the jig 23 holds the green compact S as inserting. As the holding reaction force loaded from the green compact S to the clamper 21 is received with the pressing mechanism 22, the force acting to the feed bar 31 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a sizing press for compression molding a powder material and straightening a sintered powder compact, and particularly to a device for taking out the molded product.

[Prior art] A sizing press is a device that corrects and molds a powder compact that has been compression-molded and sintered from a powder material to a predetermined size. Many sizing presses have a
, (c).

This is done by embedding the die 101 in the upper end surface of the press body 1.
00, an upper punch plate 104 located above the base +02 and having the upper punch 103 disposed at its lower end; A guide bar 108, 1 includes a lower punch plate 106 on which a punch 105 is disposed, and communicates the upper punch plate 104 and the lower punch plate 106 with the base 102 by a hydraulic cylinder (not shown).
It is installed so that it can move up and down along 09. Here, the lower punch 105 is composed of a first bunch 105a having a hollow portion in its axial center portion, and a second punch l05b provided to engage with the outer periphery of the first punch 105a. A core rod I that engages with the shaft core hollow part of
ll is used as a guide shaft, and is slidably positioned within the die 101 in conjunction with the vertical movement of the lower punch plate 106. Then, the molded product S is taken out as shown in FIG. 5(a). After sizing with the lower punches 103 and 105, the first punch 105 is used as shown in FIG.
Move the lower punch 105 upward until the upper surface of the die 101 is flush with the upper surface of the die 101, and then, as shown in FIG. The second punch l0 is placed so that the upper surfaces of the first bunch 105a, the second punch 105b, and the die 101 are negative.
This was done by moving only 5b upward and extracting the molded product S.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional example, the lower punch 10
5 is a first punch 1 for extracting the molded product S by extracting the part that fits into the annular recess or convex portion of the molded product S.
05a and the second punch 105b, the first punch 105a and the second punch 105b
It was necessary to prepare each of these, which led to an increase in manufacturing costs.

Further, since the first bunch 105a and the second punch 105b need to perform different vertical movements, they must be driven separately at predetermined timings, requiring complicated control.

The present invention has been made to solve the problems of the prior art described above, and its purpose is to reduce costs without dividing the lower punch, and to ensure reliable ejection of molded products. It's about doing.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes an upper punch, a lower punch, and an upper punch. a die having a straightening die hole into which the opposing end of the lower punch can be slidably fitted; In a molded product take-out device of a sizing press, the molded product is pulled out from the straightening die hole by the lower punch by moving the lower punch upward to extract the straightened molded product from the straightening die hole after pressurized straightening with the lower punch. A gripping means is provided to grip the molded product after the correction is completed.

The gripping means includes a pair of clampers disposed on both sides of the molded product, a pair of support members that support the clampers, and a pair of support members that support the clampers in a direction in which the clampers approach and separate from the molded product. In addition to a driving mechanism for moving the clamper, it may also be provided with a suppressing mechanism that presses the back of the clamper when gripping the hollow part. [Function] In the present invention having the above configuration, by providing the molded product gripping means, this gripping means grips the molded product pushed up from the straightening die hole by the lower punch and holds the molded product. Take it out. Furthermore, when a molded product is gripped by the clamper, the gripping reaction force applied from the molded product to the clamper is offset by the suppression mechanism, reducing the force exerted by this gripping reaction force on the clamper. [Example] Examples of the present invention are shown in FIGS. 1 to 4(a). (b), and its configuration is shown in Figures 1 and 3 (a) and (b).
)． The explanation will be based on (C).

First, as shown in FIG. 3(a), l is the main body of the sizing press, 2 is a die plate, and the die plate 2 has a die 3 having a straightening die hole H on its upper end surface.
is fixed and buried by the die holder 3a. An upper punch plate 4 is disposed above the die plate 2 and has an upper punch 5 at its lower end. By being held by a guide bar 7 which is provided to be vertically slidable, it is provided to be vertically movable by a driving means (not shown). 8 is a lower punch plate disposed below the die plate 2, 9 is a lower punch holder provided at the upper end of the lower punch plate 8, and a hollow lower punch is disposed in the upper part of the lower punch holder 9. lO is provided with its lower end fixed by a lower punch holder 10a,
Reference numeral 11 designates an extraction plate disposed below the lower punch plate 8 for extracting the pressurized molded product S from the die 3; 12 represents a stopper erected on the upper end surface of the extraction plate 1l; A minimum distance between the lower punch plate 8 and a fixed plate l3 disposed further below the extraction plate 11 is regulated. 14 is a connecting rod that holds the die plate 2 and communicates with the lower punch plate 8 and extraction plate U, and 15 is an extraction rod that moves vertically by hydraulic or mechanical driving means. The upper end of this extraction lot 15 abuts and holds the lower end of the lower punch plate 8, so that the lower punch plate 8 is provided to be vertically movable using the connecting rod 14 as a guide. 16 is the lower punch 1
The straightening die hole H
This core rod 16 is located inside together with the lower punch 1O, and this core rod 16 is fixed to the upper end of the core rod holder 17 attached to the fixing plate 13 by a core rod holder 16a.

The gripping means for the molded product S is shown in FIG. Figures 2 and 4(a). As shown in (b), it has a pair of clampers 21 provided for fixing the molded product S,
A suppressing mechanism 22 is provided adjacent to the clamper 21 and presses it toward the left in FIG. Here, the gripping means includes the clamper 21 and the clamper 2! The clamper 21 is composed of a pair of feed bars 31 as a pair of support members that support the molded product S, and a drive mechanism that moves the feed bars 31 in a direction in which the clamper 21 approaches and separates from the molded product S.

The clamper 21 further includes a jig 23 for gripping the molded product S. A return spring 25 that positions the jig mounting plate 41 to which the jig 23 is attached and the jig mounting plate 4l on the end face of the jig fixing member 24. A suppression bar 26 for pressing the jig 23 against the molded product S against the spring force of the return spring 25
, a guide bush 4 that slidably holds the pressure bar 26.
2. It consists of a busher 27 attached to the end of the pressing bar 26 and having inclined parts 27a, 27c and a flat part 27b.

The pressing mechanism 22 also includes a plate 28 having busher rollers 28a each having one end supported by a mounting plate 29.
and a fluid cylinder 30 that presses the plate 28 to the left in FIG. It is possible.

Next, an example of the operation of this embodiment will be explained.

The sizing press according to the embodiment of the present invention has a line feeder, which is shown in FIG. 4(a). As shown in (b), feed bars 31 and 32 are arranged facing each other on the die plate 2 as a conveyance path, and each of the feed bars
A pair of jigs 23 as gripping members are provided at 31 and 32 for each process.

FIG. 4(a) shows a state in which the molded product S is gripped, and FIG. 4(b) shows a state in which the molded product S has been sent out for one step. Supply position A. Molded product positioning position B, positioning position confirmation position C
．． A sizing press position D, a molded product residual confirmation position E, and a molded product discharge position F are provided.

First, the molded product S whose position has been confirmed iFJ at the positioning position confirmation position C is driven by the driving force of the driving means in the direction in which the feed bars 31 and 32 come into contact with the molded product S. As shown in Figure 4(a), the jig 23
grips the molded product S, and further, as shown in FIG. 4(b), one step of feeding is performed to the sizing press position D.

The molded product S sent to the sizing press position D is then pressed between the upper punch 5 and the lower punch 10 in the straightening die hole H, as shown in FIG. 3(a). Sizing is performed by Thereafter, as shown in FIG. 6(b), the upper punch plate 4 is driven upward by hydraulic pressure or mechanical means and moves, and the lower punch plate 8 having the lower punch 1O is also driven upward for extraction. The molded product S located at the upper end of the lower banchero is moved upward by the rod 15, and is pushed up onto the die plate 2 to perform the first extraction. At this time, as shown in FIG. 1, when the fluid cylinder 30 of the pressing mechanism 22 is operated, the clamper 21 moves in the eight directions of the arrow in the figure as the feed bar 31 is fed out, so that the button shear roller 28a The molded product S is pressed only when it rides on the inclined portion 27a of the busher 27 and travels the distance L on the flat portion 27b. Incidentally, the pressing force in this case is about 100 kg.

This pressing force is applied to the jig 2 via the pressing bar 26.
3, and this jig 23 grips the molded product S by sandwiching it from the direction of the white arrow in the figure, as shown in FIG. 3(C). Here, since the gripping reaction force applied from the molded product S to the clamper 21 is received by the suppression mechanism 22, the gripping reaction force applied from the molded product S to the clamper 1 21 is received by the foot par 31.
The forces acting on 32 are reduced. Therefore, by providing the line feeder itself with a gripping means, it is necessary to increase the gripping force and to have sufficient rigidity against the gripping reaction force, so it is necessary to increase the strength of the feed bars 31 and 32. As a result, the feed bar 3
1. This prevents the feeding speed of the molded product S from decreasing due to an increase in the weight of the molded product S. Furthermore, while the fluid cylinder 30 is pressing the flat portion 27b, the lower punch plate 8 is lowered to perform a second extraction, whereby the molded product S is extracted from the lower punch IO and the molded product S is extracted from the busher roller. 28a is a sloped portion 27c
The pressing force is released. Then, the molded product S located at this sizing press position D is sent out to the molded product remaining confirmation position E by being sent out for the first step again. In addition, the distance L of the flat part 27b is set only while the press position is slightly moved to prevent unnecessary pressure from being applied to the molded product S for a long period of time after being drawn out, and to prevent it from falling into the straightening die hole H. It is desirable to set it at a very short distance so that it can receive the pressing force.
By the way, during the feeding of the molded product S, the busher roller 28a always pushes the busher 27 with a force of about 100 kg.
This force is applied in a direction perpendicular to the feeding direction of the molded product S, and since the busher roller 28a has a roller that reduces frictional force, the force applied in the feeding direction is The amount is about 1/10 to 1/20 lO to about 5 kg, and the force from the busher roller 28a does not interfere with feeding. In this embodiment, the suppressing mechanism 22 is provided separately instead of the gripping means for feeding out the molded product S, but instead of the suppressing mechanism 22, the gripping force of the gripping means itself may be increased. However, by providing the suppressing mechanism 22 separately as in this embodiment, the feeding speed of the molded product S can be increased, and the production efficiency of the sizing press can be improved.

[Effects of the Invention] As explained above, in the present invention, the gripping means grips the molded product pushed up from the straightening die hole by the lower punch and takes out the molded product, so that the lower punch does not need to be removed. There is no need to separate the molded parts to take them out, and the lower punch can be constructed as an integrated piece, significantly reducing manufacturing costs such as mold costs. Since it is not necessary to provide a plurality of drive means for driving the divided lower punches, the number of parts in the device configuration can be reduced, and timing control of the drive means can also be simplified.

In addition, by reducing the force acting on the support member on which the clamper is supported, the weight of the support member can be easily reduced, which reduces the burden on the drive mechanism of the support member and enables high-speed transport of molded products. becomes.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the configuration of main parts of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line X-X in FIG. 1, and FIG. 3(a),
(b). (c) is a schematic sectional view showing the sizing operation of this embodiment, and FIG. 4(a). (b) is a plan view showing the gripping operation in this embodiment; FIGS. 5(a), (b),
(c) is a schematic cross-sectional view showing the sizing operation of the conventional example. Symbol 1... Device main body 2... Die plate 4... Upper punch plate 7... Guide bar 8... Lower punch plate 1l... Extraction plate l4... Connection rod 21...・Clumber 22...Press mechanism 31.32...Feed bar H...Dice hole for correction lO...Lower punch l3...Fixing plate 16...Core rod (gripping means) Description 3... Dice 5... Upper bunch (supporting member) Fig. 4<b) Fig. 5

Claims (2)

[Claims] (1) An upper punch, a lower punch, and a die having a straightening die hole into which opposing ends of the upper and lower punches can be slidably fitted, the die being loaded into the straightening die hole. In a molded product take-out device of a sizing press, which presses and straightens the powder sintered body with upper and lower punches, and then moves the lower punch upward to extract the molded product after straightening from the straightening die hole. A molded product removal device for a sizing press, characterized in that it is provided with a gripping means for gripping a molded product after correction that is extracted by a lower punch from the sizing press. (2) The gripping means includes a pair of clampers placed on both sides of the molded product, a pair of support members that support the clampers, and a direction in which the clampers approach and separate from the molded product. 2. The molded product take-out device for a sizing press according to claim 1, further comprising a drive mechanism for moving the molded product, and a pressing mechanism for pressing the back surface of the clamper when the molded product is gripped.