JPS5930433A - Punching method - Google Patents

Abstract

PURPOSE:To remove easily, exactly and quickly burrs, by punching a work, returning a punched work to a punching hole of a blank material, removing the burrs, and thereafter, separating them from the blank material again. CONSTITUTION:A thin sheet blank material 1 is fed intermittently, and first of all, a shaft hole 4 of a washer 2 is punched by a small diameter punch of a press machine. Subsequently, by an intermittent feed of one or plural steps of the blank material, said shaft hole 4 is carried in between a large-diameter punch 6 of the press machine and a push-back knockout 7, and a washer 2 is punched by the punch 6. In that case, the punch 6, the washer 2 and the knockout 7 lower together, and burrs 8 are formed on the upper part of the outside circumferential edge of the washer 2. When the punch 6 lifts, the knockout 7 lifts as one body with the punch 6 by its elastic force, and fits the washer 2 into its punched hole 9. Subsequently, burrs 5, 8 are removed between buffs 10, 10, and thereafter, they are separated from the base material 1 by a detaching punch 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a punching method for punching out a workpiece such as a washer from a plate material, and an object of the present invention is to easily and reliably remove burrs produced during punching.

Generally, when a workpiece such as a washer is punched out of a plate material, burr is generated, so it is necessary to remove the burr depending on the use of the workpiece, such as a washer used in an internal combustion engine. Barrel machining is usually used as a method for removing paris, but if the paris becomes large, it may not be possible to completely remove the paris, and the workpiece itself may become distorted. Furthermore, in barrel processing, processing is performed only after a predetermined amount of punched workpieces have been punched, which requires stocking of semi-finished products, and is generally unsuitable for small-scale production. On the other hand, other methods of removing burrs are already unsuitable for mass production due to time and cost considerations, and they also thicken the periphery of the workpiece as well as the periphery of the workpiece, reducing the outer diameter of the workpiece. There were drawbacks such as the size being distorted.

In view of these circumstances, the present invention has been developed to reliably handle even large parts without distorting the workpiece or significantly scraping off the outer peripheral edge of the workpiece, and further, by continuous processing, it can be produced in both mass and small quantities. The present invention provides a punching method that can also be used.

The present invention will be described below with reference to the illustrated embodiment. (1) is a band-shaped thin plate that is intermittently transferred in the direction of the arrow in FIG. 1; Thrust washers (2) as workpieces are punched out in two rows from A(i) (Fig. 3). In addition to the above two rows, the thrust washer (2) may be punched out in one row or in multiple rows of three or more rows.

The above material (1) is inserted into a press machine (not shown),
First, the shaft hole (4) of the washer (2) is punched out using a small diameter punch (3) of the press machine. At this time, as shown in Fig. 2, by punching the punch (3) from above to below, a downwardly projecting hole (5) is formed at the lower part of the inner peripheral edge of the shaft hole (4). . In addition, the punched pieces punched with the small diameter punch (3) are inserted into the shaft hole (4) in the same manner as pushing back the washer (2) described below.
It is also possible to return 1llll within the range.

Next, by intermittent feeding of the material (1) in one step or multiple steps, the shaft hole (4) is punched with a large diameter punch (6) of the same press machine and a bush pack knockout (
7), and the washer (2) is punched out using the large diameter punch (6).

The bush pack knockout (7) is urged upward by a strong elastic force so that its upper surface is substantially at the same height as the surface of a lower punching die of a press machine (not shown),
When punching the washer (2) with the punch (6), the punch (6) and the bush pack knockout (7)
The washer (2) is held between the punch (6) and the punch (6). The washer (
As shown in FIG. 2, the outer circumferential raised portion of 2) is formed with an i-shape 8) that protrudes upward in accordance with the punching direction. At this time, at the upstream position of the material (1), at the same time as the punch (6) punches, the shaft hole (4) is punched by the punch (3).
) is punched out.

When the punch (6) stops descending and starts rising,
The bush pack knockout (7) also rises together with the punch (6) due to the elastic force that urges it, and its strong elastic force pushes the washer (2) into the punched hole (1) formed in the material (1). 9) Refit inside.

A washer (
2) will not naturally fall out of the punched hole (9) unless a certain amount of external force is applied. Note that, if necessary, the washer (2) fitted in the punched hole (9) may be pressed together with the lugs (1) by a stripper to strengthen the bond between the two.

The washer (2) fitted in the punched hole (9) has a plain 4F
It is carried out from the press machine by the intermittent feeding of l (1), is carried between a pair of upper and lower puffs (10), and the puff (lO)
5) and (8) above are polished and removed.

When removing the washer (2), the washer (2) is fitted into the punched hole (9) with the same thickness and the same shape.
As in the case where there is no external material (1) in 2), avoid polishing the outer circumferential tightening part of the washer (2) more than necessary and disrupting the external dimensions, and also avoid causing distortion to the washer (2). Furthermore, the surface roughness can be reduced.

Note that, depending on the case where the formation direction of the bar 5L (8) is the same direction or depending on the use of the washer (2), the puffing process can be performed only on the - side surface of the r-nosher (2). In addition, as a polishing method for removing the particles (5) and (8), an appropriate polishing method can be used in addition to buffing, and in particular, the material (1) around the washer (2) is When a strong method is used, it is effective in preventing unnecessary polishing of the outer peripheral edge of the washer (2).

After the removal of the springs (5) and (8) as described above is completed, the washer (2) is transported along with the intermittent transfer of the element u(1), and is removed by the removal punch (11) provided at the required position. It is separated from the material (1) and stocked as a finished product.

As described above, the present invention includes a punching step for punching a workpiece from a material, a pushing back step for pushing the punched workpiece back into a punched hole in the material, and a step for fitting the punched workpiece into the punched hole. The surface of the combined work is polished at the same time to remove the above-mentioned paris, and the workpiece from which paris has been removed is removed again! Since it is equipped with a separation process that removes it from the LIFA, it is possible to obtain finished products continuously, there is no need to slide semi-finished products as in conventional barrel processing, and it is also possible to mass produce. It has the advantage of being able to freely adjust the production volume from small to small-scale production. In addition, in the present invention, since the surface of the moon and the workpiece fitted in the punched hole are simultaneously polished, a polishing method having a relatively strong polishing force capable of removing large particles is adopted. However, compared to polishing the workpiece alone, it is possible to prevent unnecessary polishing of the outer peripheral edge of the workpiece, and there is less distortion of the workpiece, making it easier and faster to polish the workpiece. This provides the effect that deburring work can be performed reliably.

[Brief explanation of drawings]

Fig. 1 is a process diagram showing an embodiment of the present invention, Fig. 2 is a sectional view exaggerating the state of the holes (5) and (8) of a punched washer (2), and Fig. 3 is a stamped washer (2). It is a top view which shows the state in which the washer (2) which was pulled out was returned to the punched hole (9) of a moon.

Claims (1)

[Claims] A punching process in which a workpiece is punched out of the moon, a push-back process in which the punched workpiece is pushed back and fitted into the punched hole in the moon, and the surfaces of the above-mentioned material and the workpiece fitted in the punched hole are simultaneously A punching method characterized by comprising a deburring step of polishing and removing detritus, and a separation step of separating the workpiece from which detritus has been removed from the blank again.