JPS59173203A - Shoeless sizing method - Google Patents

Abstract

PURPOSE:To enable re-compression with highly dimensional accuracy by accurately and rapidly charging a sintered body in a mold, by preliminarily forming the holding part of the sintered body while successively sending the sintered body into the holding part from an oblique chuter. CONSTITUTION:The sintered body 10 fed from an oblique chuter 9 is charged to the holding part 7a of a die 7 and pressed by an upper and a lower punches 4, 6 to correct the dimension thereof to that of the effective diameter part 7b of the die 7. Thereafter, the upper punch 4 is raised with the rising of the lower punch 6 to pull off the sintered body 10 which is, in turn, discharged from the die 7 by a separate discharge apparatus consisting a cam and a link mechanism. Succeedingly, the lower punch 6 is lowered and, at the same time, the sintered body 10 on the chuter 9 is moved over the distance corresponding to one piece by gravity and charged to the holding part 7a of the die 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The purpose of the present invention is to improve the dimensional accuracy and density of sintered machine parts after sintering, or to modify the shape if necessary. Shoeless sizing method in recompression process Regarding.

In general, during the recompression process after sintering sintered machine parts, unlike the compression molding process of powder, the sintered body that has already been shaped is recompressed, so how can it be accurately and quickly molded? An important point in manufacturing technology is whether the mold can be charged.

Conventionally, the charging method in the 11 compression process of the sintered body has been to use a rotary table or an Intex table, etc., to partially charge the table, and charge the punch center while rotating it intermittently, or to charge the punch center at once to the feed shoe. However, charging the punch center requires positional accuracy, and as a countermeasure to this, a guide portion is provided.

When the sintered body 01 is pressurized within the effective diameter 02a of the die 02 for the recompression process as shown in FIG. 01 is conveyed to the punch center and held stationary at the punch center as a die guide, and the upper bunch 04 and lower punch 05 are moved as shown in the shoe motion in Fig. 2.
With the operation of the shoe 03, the shoe 03 is moved forward or backward by MfJ.

Furthermore, due to the structure in which the die guide portion and the die 02 are integrated as shown in FIG. 3, charging of the sintered body 01 is performed by a shoe motion as shown in FIG. 4.

However, in any of the above cases, a conveyance mechanism from the next charge to the punch center, which is the second charge, is required, and the structure is complicated, making handling difficult, resulting in poor productivity and high costs. .

The present invention was made in view of the above-mentioned circumstances, and provides a sizing method for charging a sintered body, which requires a complicated conveyance mechanism.

Hereinafter, the embodiment according to the present invention will be explained in detail based on FIGS. 5 to 15. 1. FIGS. A sectional view of the main parts during pressurization is shown, and 1 is a punch holder, 2 is a core holder, 3 is a core, 4 is an upper punch, 5 is a spring, 6 is a lower punch, and 7 is a tie.

The tie 7 is formed into a shape having a partially cut-out holding portion 7a as shown in FIGS. 6(al), (b), and (c), and is assembled as shown in FIGS. It is being

The sheath body 10 is sequentially fed and charged, and the sheath body 10 is heated by the pressing process of the upper and lower punches 4 and 6 through the effective diameter portion 7b formed below the holding portion 7a of the diamond. It is recompressed, and after completing the prescribed straightening process, the cup 11 provided on the main shaft and the link mechanism 1
It is discharged by 2.

In order to prevent the sintered compact 10 waiting to be charged from moving onto the punch center during the pressurization cycle, the operation of the device according to the present invention starts from the start of the ejection process, as shown in FIG. The curve is set so that the escape speed of the upper ram is very slightly faster until it appears on the table, and the difference is as shown in Figure 10.
=A.

As a result, the sintered body JO does not move unless immediately after the lower bunch 6 falls. It's a trench, sintered body 10 waiting to be charged.
, the upper and lower punches 4 and 6 and the product after cutting are in contact with each other, but since the outer diameter of the molded product usually has a predetermined chamfer, the upper and lower punches 4 and 6 come into contact with the chamfered portions of the outer diameter end faces. As shown in Fig. 16, if there is no problem, perform a chamfering process (1) of 10' to 20' on the outer diameter end faces of the upper and lower punches 4 and 6 within a range smaller than the product chamfer "A: (T)". The result will be even better.

Next, 6 presses in the device configured as described above.
The cycle will be described in detail with reference to FIGS. 11 to 15.

No: ChiF? =)〉J2 No. 11 is sent from the ura paper-reuter 9 to the sintered body 1
0 is charged in the holding part 7a of the diamond, and the 12th jQ
As shown in FIG. 1, it is pressurized by the upper and lower bunches 4 and 6 to correct the size of the effective diameter portion 7b of the diamond. After that, as shown in Figure 13, with the rise of 1 batch 6 -
When the lower bunch 4 rises, the sintered compact 10 is extracted, and is ejected by a separate ejection device consisting of a cam and a link mechanism as shown in FIG. The body IO is charged as shown in FIG. That is, when the lower punch 6 moves down one position, the sintered body 10 on the shooter 9 moves one position due to gravity, and the portion 7a held by the tie 7 is charged.

As described and clarified in detail above, the shoeless sizing method according to the present invention is more effective than the conventional method when charging a sintered body during the recompression step of rounding and rounding after sintering a sintered machine part. -, without the need for a shoe or the like, a holding part for the sintered body is formed on the die in advance, and this holding part has a +1111
The structure is such that the sintered body is fed into the il+ (fourth stage) through an inclined shooter, and the sintered body can be accurately and quickly charged into the specified mold. Body charging mechanism 75
It is only one punch, and it has the effect of improving dimensional accuracy and improving productivity.

[Brief explanation of drawings]

1 to 2 and 3 to 4 are cross-sectional views and explanatory diagrams showing the charging state of conventional embodiments, and FIGS. FIGS. 6(a) and 6(b) are cross-sectional views of the clasp showing the device according to the invention. (c) is a soil surface view, a cross-sectional view, and a perspective view 1 of the die according to the present invention.
Figures 71 to 8 are illustrations showing the features of the device according to the invention [21, r, 'I't 9
The figure shows the operation state according to the present invention. FIG. 10 and FIG. 16 show main parts i according to the present invention.
The state-of-the-art diagrams, FIGS. 11 to 15, are explanatory diagrams of the free cycle of the apparatus according to the present invention. . 1. Punch holder, 2. Core holder 13. Core,
4...-Upper bunch, 5...Spring/ri, 6...Lower batch, 7...Gui, 7; Shi...Holding part, 7b...Effective diameter part, 8...Aligning device, 9・N coater, 10... Sintered body, 11... Cam, 12... Link mechanism 11'l Applicant: Mitsubishi Metals Co., Ltd. Agent Patent attorney: Hideaki Sato P5 (phantom) -su4 Figure (L) ? 7 /g 尤, 8 (Stribution q0 bar H-〇=A Gui / 130' years old / 4 Oka name / 6 diagrams

Claims (1)

[Claims] In the charging method in the recompression process of the sintered body, a holding part partially cut out is formed in the upper part of the effective diameter part formed in the die for charging the sintered body, and a holding part of the die is provided with a slope 17 from the parts feeder. A shoeless sizing method characterized by sequentially feeding sintered bodies through a shooter.