JPS63286231A - Method for preventing biting of press product at its piling time and press die used for its method - Google Patents

Abstract

PURPOSE:To prevent a biting by press-forming the plural seats projecting to the external part and whose area on the apex face becomes larger than that of the root part, taking its height as the height adhering by the seat only at the time of piling a press product each other and piling it in accordance with the position of each seat. CONSTITUTION:A circular recessed part 12 is formed on a rear floor panel 11 (press products) and on this bottom face, the projecting part 13 projecting in a spherical face shape slightly upwards is provided. At the plane part 14 around the recessed part 12, the seat 16 preventing the biting caused at the time when the panel is piled up is formed in plural pieces. The seat 16 projects upwards from the plane part 14 and the cross section becomes of reverse conical shape. The area S1 of its apex face is made larger than that S2 of the root and the height H of the seat 16 is larger than the height L1 of a flange 15 and made in the height that the other part is not closely fitted excepting the seat 16 at the time of piling the rear floor panel 11. The press die forming the east for preventing biting on these press products is formed by two stages. The biting of the press product is thus prevented and the taking-out of a product can be automized.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a method for preventing press products formed by press molds from sticking together when stacked, and a method for preventing press products from sticking together. The present invention relates to a press mold that forms a seat for preventing sticking.

(Prior art) As a prior art related to the present invention, Japanese Patent Application Laid-Open No. 55-1615
No. 20 and Japanese Patent Publication No. 56-35964 are known.

The dent forming method disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 55-161520 is such that when forming a dent in the workpiece by press-contacting the center member to the workpiece, there is a gap between the workpiece and the center member. This is done by interposing a thin paper and applying pressure. In this method, when the center member and the workpiece are separated after pressure contact, there is a gap between them due to the releasing effect of the thin paper.
l No tension is generated.

In addition, the method of extruding protrusions on a wide surface of a metal plate disclosed in the Publication No. 35964 of 1984 involves forming a convex part on one side of the metal plate using a restraint mold that suppresses the flow of material to the outside. A female die having a hole for forming the protrusion is placed on the other side of the metal plate from a position opposite to the hole for forming the protrusion, and a male die having a cross-sectional area larger than that hole is pressed from the back side of the metal plate to form the protrusion. This increases the height of the

By the way, when a number of pressed products having pressed concave and convex portions are stacked, there is a problem in that the products are stuck together due to their own weight and it is very difficult to take them out one by one. For example, among automobile press parts, there are those that have two or more cross sections parallel to each other in the loading direction (including those that are continuous), such as the rear floor pan, and those that have deep-drawn shapes that have flanges. When these products are loaded onto a pallet, the weight of the products causes the panels to stick together, making it very time-consuming to separate the panels. This is a major factor that hinders automation of production lines.

Therefore, in the past, measures such as those shown in FIGS. 6 and 7 were used to prevent the pressed product from sticking.

FIG. 6 shows a special pallet on which pressed products are loaded. Each support post 2 of the special pallet 1 is provided with a plurality of latches B serving as metal fittings at a predetermined interval H2. The latch 3 is rotatable relative to the support post 2, and normally faces upward due to its own weight. Press product 4
4J: 'The receiver is configured to be stopped by a pair of left and right latches 3, and when the pressed product is stopped, the latches 3 are in a horizontal state. In such a special pallet, the pressed products 4 are arranged at a predetermined interval H1, so that the pressed products 4 are prevented from coming into close contact with each other.

Further, each time the pressed product 4 is taken out, the latch 3 automatically escapes due to its own weight, making it easy to take out the pressed product 4.

FIG. 7 shows a pallet using a cushion for preventing adhesion. Although the pallet 6 shown in this figure is a mere ordinary pallet, a ring-shaped cushion member 8, for example, is interposed between each press product 7. therefore,
In this case as well, the pressed products 7 are brought into close contact with each other, preventing the products from sticking together.

[Problems to be Solved by the Invention] [However, the conventional stacking method in which special pallets or cushion members are interposed has the following problems.

(a) In the method of using a special pallet, the structure of the pallet becomes complicated and the manufacturing cost increases.

(b) When special pallets are used, the number of pressed products loaded decreases, and the cost increases due to the increase in the number of pallets.

(c) As a result of (b), the number of transportation steps increases.

(d) The productivity of the press line decreases due to the stroke down due to the increase in work hours such as inserting the loading cushion member into the special pallet.

In addition, if products are stacked without using a special pallet or inserting a cushion member,
Not only is it difficult to separate the sheets one by one, but if you try to force them apart, the pressed product may become deformed, requiring modification.
A problem arises in that the product becomes scrapped.

Therefore, in the pressing process, if it is possible to form a seat on the pressed product that prevents sticking due to close contact during stacking, the ripple effect will be very large.

The present invention has focused on the above-mentioned problems, and has developed a press product that prevents stacked press products from sticking due to close contact without using special pallets or cushioning members, and allows press products to be reliably taken out one by one. An object of the present invention is to provide a method for preventing sticking during stacking and a press mold for forming a seat for preventing sticking.

Means for Solving Problem c] The method for preventing sticking during stacking of pressed products according to the present invention in accordance with this objective is based on an example of a pressed product that protrudes outward and has a top surface area larger than a base area. A plurality of seats are formed using a press mold, and the height of the seats is set so that when the press-formed products are stacked on top of each other, only the seats will come into contact with each other, and the parts other than the seats will not come into contact with each other. The press products are stacked one after another so that the positions of the press products coincide with each other.

Further, the press mold that forms a seat for preventing sticking when stacking pressed products has a concave portion on the top surface of the male mold, and a convex portion is formed at a position opposite to the concave portion of the male mold of the female mold. A first press mold, a male mold used in a post-process of the first press mold and having a flat top surface, and a female mold having a flat bottom surface opposite to the top surface of the male mold. and a second press mold having a bottom surface area larger than the top surface area of the male mold.

[Effect]

In this method for preventing sticking when stacking pressed products and in the press die for forming the seat for preventing sticking, a seat that projects outward is formed on one side of the pressed product by the press die for processing the products. In this case, the area of the top surface of the seat is formed to be larger than the area of the base. The height of the seat is such that when the press-molded products are stacked on top of each other, only the seats will come into contact with each other, but the parts other than the seats will not come together.
← will be set. If the pieces are stacked so that the positions of the presses and seats match each other, the base of the seat of the next press product will be placed on the top surface of the seat with a large area.

In other words, since the base and top surfaces have different areas, the top surface of one pressed product cannot fit into the base of the seat of the other pressed product, and each pressed product rises by the height of the seat. It turns out. .

Therefore, each pressed product will not come into close contact with each other due to its own loaded weight, and sticking will be prevented.

As a result, even if many pressed products of the same shape are stacked,
It becomes possible to reliably take out pressed products one by one, and work efficiency is greatly reduced.

□ [Example] Hereinafter, preferred embodiments of a method for preventing sticking when stacking pressed products and a press mold for forming a seat for preventing sticking according to the present invention will be described with reference to the drawings.

First, a press product formed by a press die will be explained. FIG. 1 shows an automobile floor panel 1) after press molding.

The material of the rear floor panel 1) is made of thin steel plate.

The rear floor panel 1) has a recess 12 having a circular planar shape.
is formed. A protrusion 13 that protrudes slightly upward in a spherical shape is formed on the bottom surface of the recess 12 .

Radially outward from the recessed portion 12 is a flat portion 14, and a flange portion 15 is formed at the end of the flat portion 14. A plurality (4) of seats 16 are formed on the flat surface 14 around the recess 12 to prevent the rear floor panels 1) from sticking when a large number of them are stacked.

As shown in FIG. 2, the seat 16 protrudes upward from the flat portion 14 and has an inverted truncated conical cross section.

The area S1 of the top surface 16a of the seat 16 is larger than the area S2 of the root portion 16b. The height H of the seat 16 is greater than the height of the flange portion 15, and is set to such a height that parts other than the seat 16 are not brought into close contact when the rear floor panels 1) are stacked.

Next, a press die for forming a bite-preventing seat on a press product will be described. FIGS. 4 and 5 show molds for molding the product itself, and for example, a portion for molding a seat is formed in these molds. The seat 16 is processed through two steps.

Figure 4 shows the first press mold 2 used in the first processing process.
1 shows a partially enlarged cross section of No. 1. In Figure 1, 22
indicates the male type, and 23 indicates the female type.

The male mold 22 has a substantially cylindrical outer shape, and the top surface 2
The cross section of the outer peripheral end of 2a is arcuate. Top surface 22a
A recess 22c having a circular planar shape is formed in the recess 22c.
The bottom surface of c is spherical. Above the male mold 22,
A female mold 23 is located. The female mold 23 has an external shape similar to that of the male mold 22. That is, a substantially circular hole 23a is formed in the female mold 23, and a protrusion 23b is formed at a position facing the recess 22c of the male mold 22. This results in
In the first step, the seat 16 of the floor panel 1) as a press product is formed by the male mold 22 and the female mold 23 to have an inner diameter and a height Ho, as shown in FIG.

FIG. 5 shows a partially enlarged cross-section of the second press die 24 used in the processing step subsequent to the step shown in FIG. 4. In FIG. 5, 25 indicates a male type, and 26 indicates a female type. The male mold 25 has a cylinder m'2sb projecting upward from the flat part 25a, and the diameter of the cylinder body 25b is equal to the above-mentioned first diameter.
The diameter D2 of the male mold 22 of the press mold 21 is the same as the diameter D2 of the male mold 22 of the press mold 21. The top surface 25c of the cylindrical body 25b is formed flat. The female mold 26 is located above the male mold 25, and a bottom surface 26b of the female mold 26 facing the top surface 25C of the male mold 25 is formed flat. The diameter of the bottom surface 26b of the hole 26a of the female die 26 is D+. The inner peripheral wall of the hole 26a of the female mold 26 is formed in an arc shape, and the diameter of the hole 26a of the female mold 26 is as follows.
The diameter gradually increases toward the opening.

Further, in FIG. 5, the distance from the flat part 25b of the male mold 25 to the bottom surface 26b of the female square mold 26 is H.

Next, a method for preventing stacking and sticking of pressed products according to an embodiment of the present invention will be explained together with the operation of the above-described embodiment apparatus.

First, the press product floor panel 1) is transported from the previous process to the process of the first press die 21. In this case, for example, a circular recess 12 has already been formed in the rear floor panel 1) in a previous step.

Therefore, in this process, the seat 16 is machined for the first time using the recess 12 as a guide, and in this process, the male die 2
2 and the female mold 23, the seat 16 is formed into a shape having an inner diameter of D2, a height of He, and a recess 16C formed on the top surface, as shown in FIG.

When the first processing of the seat 16 is completed, the rear floor panel 1) is transported to the next process. In this step, the seat 16 is processed a second time using the second press die 24. That is, in this step, the recess 16c formed on the top surface
is spread out by the top surface 25C of the male mold 25 and the bottom surface 26b of the female mold 26 to form a flat surface.

Therefore, the top surface 16a of the seat 16 bulges outward in the radial direction, and its diameter is formed to be the same as the diameter DI of the bottom surface 26b. Conversely, a radially inward force acts on the root portion 16b of the seat 16, but since the cylindrical body 25b of the male mold 25 is formed to have a diameter D2, the inner diameter is kept the same as the first inner diameter. . The height of the seat 16 is set to H. In other words,
The area SI of the top surface 16a of the seat 16 is equal to the area S of the base portion 16b.
It is formed in the shape of an inverted truncated cone larger than 2.

The floor panel 1) is press-formed in this way.
are stacked in large numbers and supplied from the press line to the assembly line. FIG. 3 shows a state in which a large number of rear floor panels 1) are stacked. In this case, the rear floor panels 1) are stacked one on top of the other so that the positions of the seats 16 coincide with each other. In other words, by aligning the two end faces of the rear floor panel 1) with a pallet (not shown),
6 is guaranteed to match. Therefore, the base 16b of the seat 16 of the rear floor panel 1) located above is located on the top surface 16a of the seat 16 of a certain rear floor panel 1), and there is a gap of the height H of the seat 16 between each panel. is formed.

Since this gap is larger than the height Ll of the flange portions 15, each flange portion 15 does not come into close contact with each other. Also, the vertical wall portion 1) a of the recess 12 of the rear floor panel 1)
A gap is also formed (at the 2nd part in FIG. 3) to prevent a close contact.

Therefore, each of the rear floor panels 1) is stacked one by one in a raised state, and there is no close contact due to the weight of the loaded panels, thereby reliably preventing jamming when taking them out as in the conventional case.

In addition, in this example, four seats were provided, but
It is desirable to provide them as appropriate, taking into account the shape of each product and the balance during loading. In addition, in this embodiment, the shape of the seat is reversed if the relationship between the area S of the top surface and the area S2 of the base is Sl > 32. It is not limited to the shape of a truncated cone, and may be any shape.

(Effects of the Invention) As explained above, the following effects can be obtained by the method of preventing sticking when stacking pressed products of the present invention and the press mold used in the method.

(a) As an example of a pressed product, a press mold is used to form a plurality of seats that protrude outward and have a top surface area larger than the base area, and the height of the seats is set so that the press molded products are close to each other. The height was set so that when stacked, only the seats were in close contact with each other, and the parts other than the seats were not in close contact, and the pressed products were stacked one after another so that the positions of the specialties matched each other, so that the pressed products would not be eaten up by their own weight. The sticking force 5 is prevented, and the pressed products can be easily and reliably taken out one by one in the subsequent process.

Therefore, it becomes possible to automate the removal of pressed products, and work efficiency can be greatly improved.

(b) The conventional special pallets and cushioning members for preventing jamming are no longer necessary, and increases in pallet production costs, loading man-hours, and transportation man-hours can be eliminated.

(c) Since there is no need to forcibly remove the pressed product, it is possible to eliminate the need to deform the product or modify it.

(d) Loading onto pallets is speeded up, thereby making it possible to increase the productivity of the press line.

(e) Since the press mold for forming the seat was composed of a first press mold for the first processing and a second press mold for the second processing, the area of the top surface was 15 mm at the base. It is relatively easy to form a seat larger than the area of . Further, if the process of forming the seat and the process of forming the product shape are performed in the same process, there is virtually no additional process for adding the seat, and the molding time can be shortened.

[Brief explanation of the drawing]

1 is a perspective view of a carrier floor panel as a pressed product applied to a method for preventing sticking when stacking pressed products according to an embodiment of the present invention; FIG. 2 is an enlarged sectional view of the seat shown in FIG. 1; The figure is a cross-sectional view showing a state in which a large number of the seat floor panels shown in Figure 1 are stacked together, Figure 4 is a cross-sectional view of the first press die used to press-form the seat shown in Figure 1, and Figure 5 is a cross-sectional view of the seat shown in Figure 1. Figure 6 is a front view of a conventional special pallet for loading pressed products. Figure 7 is a conventional pallet for loading pressed products using cushion members. This is the front view of . 1) Pressed product (rear floor panel) 16
... Seat 16a ... Top surface 16b ... Root part 21 ... First press mold 24 ... Second press mold ,...Outer diameter of the top surface D2...Inner diameter S of the root portion,...Area of the top surface S2...Area of the root portion

Claims (2)

[Claims] (1) A press mold is used to form a plurality of seats on one side of the pressed product that protrude outward and whose top surface area is larger than the area of the base, and the height of the seats is determined by the height of the pressed product. The height is such that when stacked, the pressed products are in close contact only at the seats but not at other parts, and the pressed products are stacked one after another so that the positions of each seat are aligned to prevent stacking of pressed products. Method. (2) A press mold that forms a seat on the pressed product to prevent the pressed products from biting into each other when stacking the pressed products,
a first press mold having a concave portion on the top surface of the male mold and a convex portion formed at a position opposite to the concave portion of the male mold of the female mold;
It is used in the post-process of the press mold and has a male mold with a flat top surface and a female mold with a flat bottom surface opposite to the top surface of the male mold, and the area of the bottom surface of the female mold is A press mold for forming a seat for preventing sticking when stacking pressed products, characterized in that the second press mold has a larger area than the top surface of the male mold.