JP2829270B2 - Automatic press manufacturing method for plate products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic press manufacturing method for obtaining a plate product having good dimensional accuracy and good appearance by using a general-purpose press machine, for example, using a relatively thick plate material as a raw material. .

[0002]

2. Description of the Related Art In recent years, vehicles equipped with an automatic transmission such as a torque converter have been widely used. When the vehicle with the automatic transmission is parked, the shift lever is shifted to a parking range (P range), whereby the vehicle shown in FIG.
As shown in the figure, the projection 56 of the plate-shaped pole parking 60 connected to the shift lever meshes with the valley of the gear-shaped gear parking 65 directly connected to the axle and the gear shaft 66 to connect to the wheel. The gear is locked. In order to smoothly perform these meshing operations, it is desirable that the outer peripheral surface 61 of the pole parking 60 be formed into a substantially rectangular shape in side sectional view with good dimensional accuracy and surface roughness accuracy in addition to the valley portion of the gear parking 65. In particular, the projection 56, the shaft hole 55, and the C surface 57 of the pole parking 60 require higher dimensional accuracy and a smooth finished surface.

[0003] In manufacturing such a pole parking, there is generally used a cutting method in which a raw material obtained by hot forging is used as a raw material and a product having a target shape is obtained by cutting.
Fine blanking press working (hereinafter referred to as FB press working), which is said to be capable of precision working, is employed. Among these, in the cutting method, after the protrusion is formed by broaching, buffing is performed. Further, the C surface portion and the like are formed by milling. According to this cutting method, a product having high dimensional accuracy can be obtained regardless of the thickness of the raw material plate. On the other hand, in the FB press working method, the clearance between the die die hole and the punch is set small, and the raw material plate is pressed against the die surface with a plate retainer having wedge projections, and the raw material plate is reversely pressed from the die side. Is pressed, and the product is punched out with a punch. If the raw material is punched while being sandwiched at a high pressure in this manner, it is said that there is an advantage that a fracture surface is not easily generated in the cut until the punching is completed, and that all the cuts can be formed into a sheared surface. In this FB press working method, a special F
A B press is used.

[0004]

However, in the above-mentioned cutting method, if it is desired to produce with high dimensional accuracy and good appearance, the number of steps becomes too large and it takes a lot of time and is not suitable for mass production. Was. On the other hand, in the FB press working method, the configuration of the FB press machine is originally complicated and expensive, and in addition, an expensive mold must be used. Even if an FB press is used, cracks and breakouts are unavoidable for protrusions that require particularly high precision. It was necessary to remove the cut-out portion and then finish it by buffing. One related to such a press working method is disclosed in Japanese Patent Application Laid-Open No. Hei 8-164428.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has an advantage that when a relatively thick raw material plate is processed, an inexpensive general-purpose press machine is used to improve dimensional accuracy and appearance. It is an object of the present invention to provide an automatic press manufacturing method capable of obtaining a plate-like product.

[0006]

In order to achieve the above-mentioned object, an automatic press manufacturing method of a plate-like product according to the present invention comprises a die having a die hole, a half of a die plate from a raw plate material, the half being close to the product outer shape. An external punch that punches product blanks,
An inner peripheral projection is provided on the inner surface of the die hole of the die so as to protrude inward over the entire circumference, and the inward projection dimension of the inner peripheral projection is set so that the semi-finished product blank can be elastically deformed and pass. , Forming a tapered surface that expands in the depth direction on the back side of the inner peripheral projection to form a contour punching section, conveys the raw material sheet material at a predetermined pitch in order, and corresponds to the precision die-cut portion in the plate-like product The raw material plate near the periphery was punched in advance by a rough punch placed on the upstream side of the outer shape punching section in the raw material material transport direction, and a semi-finished product blank was punched out of the raw material plate into the die hole of the die by the outer shape punch. After the semi-finished product blank is further press-fitted to a position beyond the inner peripheral protrusion, the semi-finished product blank is pushed back in the counter-pressing direction by a knockout or the like slidably disposed in the die hole of the die, and the semi-finished product blank pushed back is pressed. When the link exceeds the inner peripheral protrusion, the outer peripheral surface of the semi-finished blank is plastically deformed by pressing against the tapered surface of the inner peripheral protrusion to reshape into a plate-shaped product having a substantially rectangular side cross section. .

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic sectional side view showing a main part of a mold of a progressive automatic press used in the method of the present invention. The progressive automatic press shown in FIG. 1 is a general-purpose press, and includes a lower die 1 on a fixed side and an upper die 2 which is vertically driven to be separated from the lower die 1. This progressive automatic press machine is configured to manufacture, for example, the above-described pole parking 60 (FIG. 6) as a plate-like product. In the upper die 2, an upper liner 17, an upper die set 5, an upper packing plate 6, and an upper punch plate 7 are provided in this order from the top. In the upper punch plate 7, the transport direction of the raw material M (arrow F direction)
A punch 9, a rough punch 10, a pressing punch 11, and an external punch 12 are provided in this order from the upstream side, and are integrally fixed by the upper packing plate 6.

Below the upper punch plate 7, a stripper 8 is mounted via a rubber material 16 such as urethane rubber, and the lower surface of the stripper 8 is elastically deformed when the stripper 8 moves up and down. The punch 9, the rough punch 10, the pressing punch 11, and the external punch 12 are configured to be able to appear and disappear. In addition, the lower end of the outer periphery of the discarded hole punch 9, the rough punch 10, and the outer punch 12 is chamfered to the R surface or the C surface in order to improve the dimensional accuracy of the outer peripheral surface of the product and to suppress the occurrence of detachment. . The outer shape punch 12 is provided with a mold hole 13 for forming the shaft hole 55 in the pole parking 60 so as to penetrate vertically. The mold hole 13 communicates with a chip discharge hole 15 provided in the upper die set 5. In addition, the hole edge 14 at the lower end of the mold hole 13 is chamfered as an R surface or a C surface in order to improve the dimensional accuracy of the shaft hole 55 of the pole parking 60 and to suppress occurrence of detachment or the like.

On the other hand, in the lower mold 1, the lower liner 1
9, a lower die set 20, a lower packing plate 21, a lower punch plate 22, and a die 23 are provided in a stack. The die 23 has, in order from the upstream side in the transport direction of the raw material plate material M, a mold hole 25 through which the discarded punch 9 can enter and exit, a mold hole 26 through which the rough punch 10 can enter and exit, a pressing receiving pin 27 for receiving the pressing punch 11, A mold hole 28 capable of accommodating the outer shape punch 12 is provided. The mold hole 25 communicates with a chip discharge hole 33 provided in the lower packing plate 21, and the mold hole 26 communicates with a chip discharge hole 34 provided in the lower packing plate 21.

In the mold hole 28, a knockout 30 having a mold hole 29 penetrating vertically is provided slidably.
A punch 31 is provided in the mold hole 29 of the knockout 30.
Is inserted. The punch 31 is supported by the lower packing plate 21 and fixed by the lower die set 20, and is configured to be able to enter and exit the mold hole 13 of the external punch 12. On the lower surface of the knockout 30, a knockout pin 32 is fixedly provided. The knockout pin 32 urges the knockout 30 toward the outer shape punch 12 by a driving source (not shown). A plate support pin 24 for elastically supporting the raw material plate M is provided on the upper surface of the die 23 so as to be able to protrude and retract.

On the other hand, the raw material plate material M used in the progressive automatic press machine is composed of SCM420, SCR420, S45
It is a flat plate material made of C or the like and having a thickness of about 10 mm. The raw material plate material M is transported between the lower die 1 and the upper die 2 at a predetermined pitch P from the die hole 25 side to the die hole 28 side by an automatic transfer device (not shown).

As shown in FIG. 2, an inner circumferential projection 4 projecting inward is provided on the upper portion of the inner surface of the die hole 28 of the die 23.
0 is provided over the entire circumference. This inner peripheral projection 40
Is formed by wire electric discharge machining using a wire having a diameter of about 0.2 to 0.3 mm. The inwardly projecting dimension t of the inner peripheral projection 40 is set to such a degree that the semi-finished product blank 60B (see FIG. 3 described later) punched by the outer shape punch 12 and the mold hole 28 can be elastically deformed and pass through. In this case, the thickness is preferably about 0.02 to 0.3 mm. Also,
The inner peripheral projection 40 has a tapered surface 43 formed by expanding downward on the inner side of the mold hole 28, a tapered surface 41 formed by expanding upward on the entrance side of the mold hole 28, these tapered surfaces 43, 4
It has a distal end surface 42 formed between the two and has a substantially trapezoidal cross section.

The taper angle θa formed by the tapered surface 41 with respect to the hole center direction and the taper angle θb formed by the tapered surface 43 with respect to the hole center direction can be set to optimal values according to the material and thickness of the raw material plate. It is good, but it is SCM4
When the raw material M made of 20 is processed, the taper angle θa,
It is preferable to set an appropriate value for both θb within the range of 10 ° to 60 °. Further, the width of the tip end surface 42 in the hole center direction is 2 to 2.
It is set to about 6 mm. This is because if the width is further increased, it becomes difficult to obtain a predetermined or higher wire cutting accuracy by wire electric discharge machining.

The outer diameter of the knockout 30 is set to a size that allows the knockout 30 to pass through the inner peripheral projection 40 of the mold hole 28. That is, the outer shape punching portion 45 includes the outer shape punch 12, the die 23 having the mold hole 28, and the inner peripheral protrusion 40 having the tapered surface 43.

A method of manufacturing a pole parking (one example of a plate-like product) for an automatic transmission using the progressive automatic press having the above-described structure will be described with reference to FIGS. This will be described below. First, the raw material plate material M is transported in the arrow F direction while being supported by the plate material support pins 24. And a pilot hole punch (not shown)
Pilot hole blanks 50B are punched in the vicinity of both ends of the raw material plate material M to form two pilot holes 50.
At the same time, the blank 5 is removed by the punch 9 and the mold hole 25.
1B is捨穴51 by punching (S ₁ in FIG. 3).

Next, the raw material plate material M is conveyed by a predetermined pitch P, is positioned and stopped by a pilot pin (not shown) engaged with the pilot hole 50, and is roughed by the roughing punch 10 and the mold hole 26 to form rough blanks 52 B, 53 B. Are punched out and become holes 52 and 53 (S _{2 in} FIG. 3). here,
The position of the rough blank 52 </ b> B in the raw material sheet M is a position corresponding to the outer side near the protrusion 56 of the pole parking 60 indicated by the target shape T. Also, rough blank 53B
Is a position corresponding to the outside of the vicinity of the C surface portion 57 of the pole parking 60.

Again, the raw material plate M is conveyed by a predetermined pitch P and stopped in position, and the raw material plate M is crushed between the pressing punch 11 and the pressing receiving pin 27, so that a crushed portion 54C inclined with respect to the surface of the plate material. Is formed. At this time, the excess thickness of the crushed portion 54C is plastically deformed and extended into the discarded hole 53 (S3 in FIG. ₃ ).

Again, the raw material plate material M is conveyed by a predetermined pitch P and stopped in position.
By 8, the semi-finished product blank 60 </ b> B substantially forming the outer shape of the pole parking 60 is punched out and housed in the mold hole 28 (S <b> _{4 in} FIG. 3). Finished blank 56 generated at this time
B and 57B are discharged to the outside by high pressure air or the like through a chip discharge hole (not shown) provided below the mold hole 28.

Particularly, in this case, the details will be described with reference to FIGS. 4 and 5. First, the outer shape punch 12 descends and reaches the upper surface of the raw material plate material M (FIG. 4A). By successively lowering the outer shape punch 12, the raw material plate material M is sandwiched between the knockout 30 and the semi-finished product blank 60B is further punched between the raw material plate material M and the upper edge of the mold hole 28 while being sandwiched. And reaches the upper end surface of the punch 31 (FIG. 4B). At this time, semi-finished product blank 6
On the outer peripheral surface 61a of OB, a punched tapered portion or a punched-out portion is formed by punching (FIG. 5).

Further, the outer shape punch 12 has a knockout 30.
, While the semi-finished product blank 60B is sandwiched, the upper end position of the punch 31 is fixed.
B is punched upward and pressed into the mold cavity 13 (FIG. 4).
(C)). Thereby, the shaft hole 5 is formed in the semi-finished product blank 60B.
5 are formed. At this time, since the finishing blank 55B is plastically deformed, and the excess thickness generated at that time extends toward the discarded hole 51, the shearing force is dispersed, so that no large shear strain is generated at the edge of the shaft hole 55. Thus, the inner peripheral surface of the shaft hole 55 is in a favorable state to the extent that it is not necessary to perform a special finishing process. The finished blank 55B pushed up in the mold hole 13 is discharged to the outside from the discharge hole 15 which is stacked and scraped every time the subsequent pole parking punching is performed.

On the other hand, the semi-finished product blank 60B is pressed into the lower wide-diameter portion 44 beyond the inner peripheral projection 40 while being sandwiched between the outer punch 12 and the knockout 30 (FIG. 4D). And Fig. 5) Semi-finished blank 60
Since B itself elastically deforms when it passes over the inner peripheral protrusion 40, and the outer peripheral surface 61a has a tapered shape at the time of punching, it can relatively easily exceed the inner peripheral protrusion 40. Thus, the lowering operation of the upper mold 2 is completed.

Next, the knockout 30 is raised by driving the knockout pin 32. The semi-finished product blank 60B is lifted while being sandwiched between the external punch 12 and the knockout 30, and is pushed back in the counter-pressing direction. Then, when the semi-finished product blank 60B exceeds the tapered surface 43 of the inner peripheral projection 40, the semi-finished product blank 60B is plastically deformed again at the upper end portion of the outer peripheral surface 61a by pressure contact with the tapered surface 43 and is extended toward the lower part. As a result, the removal taper portion and removal portion are eliminated. Further, the outer peripheral surface 61 a of the semi-finished product blank 60 </ b> B is adjusted by press contact with the distal end surface 42 of the inner peripheral projection 40. As a result, a pole parking 60 having a substantially rectangular outer cross-section 61 in a side sectional view is obtained (FIG. 5). Incidentally, depending on the product, by adjusting the pushing force applied to the knockout 30,
The removal taper portion and the removal dripping portion can be eliminated to some extent.

Further, as in the case of the inner peripheral surface of the shaft hole 55, the outer peripheral surface of the projection 56 and the C-surface portion 57 of the pole parking 60 is partially cut off due to the existence of the pre-drilled holes 52 and 53. Since the product blank 60B is formed without generating a large shear strain at the time of punching, the condition of the outer peripheral surface is relatively good only by punching. In addition, since the outer peripheral surface shape is adjusted when the inner peripheral protrusion 40 passes, the protrusion 56 and the C surface 5
The outer peripheral surface of 7 is precisely formed.

As described above, according to the method for automatically manufacturing a pole parking press using this automatic progressive press machine, the dimensional accuracy and appearance of the outer peripheral surface 61 are good.
5, the pole parking 60 having extremely high dimensional accuracy can be manufactured in the precision die-cut portions such as the protrusion 56 and the C-face portion 57. Further, a series of steps from the punching of the pilot hole 50 to the removal of the pole parking 60 which is a plate-shaped product can be automatically and sequentially performed.

In the press machine according to the above embodiment,
Although the punch and the die-shaped holes for manufacturing the pole parking are exemplified, it goes without saying that the shape, arrangement, structure, and the like of the punch and the die-shaped holes are not limited to the above-described embodiment.

Further, in the above, the form of manufacturing the pole parking has been exemplified. However, the method of the present invention is not limited to this, and any plate-like product which is a thick plate and requires a precision die-cut portion is used. It can be suitably applied.

Further, in the above description, the thickness of the raw material plate is 10 mm.
Although the case of using a plate material of about mm is shown, the method of the present invention can also use a raw material plate material of other thickness.
However, when a raw material plate having a thickness of about 16 mm or more is used, it is preferable to use a plate material obtained by hot forging or warm forging.

[0028]

As described above, according to the automatic press manufacturing method for a plate-like product according to the present invention, a tapered portion or a drawn-out portion is left on the outer peripheral surface of a product from a relatively thick raw material plate. Plate-like products with good dimensional accuracy and shear surface appearance
It can be manufactured using an inexpensive general-purpose press. In addition, such a plate-shaped product can be automatically mass-produced by a series of pressing steps, and there is an advantage that a plate-shaped product at a lower price than the conventional technology can be provided to the market.

Further, since the raw material sheet near the position corresponding to the precision die-cutting portion is punched in advance with a rough punch, it is only necessary to punch the remaining portion at the time of rough punching when punching the product outer shape. It is possible to obtain a plate-shaped product in which the shear strain generated in the precision die-cut portion is small and the dimensional accuracy of the precision die-cut portion is extremely good.

[Brief description of the drawings]

FIG. 1 is a schematic side sectional view showing a main part of a die of a progressive automatic press used in an automatic press manufacturing method according to the present invention.

FIG. 2 is a schematic side sectional view showing a main part of a die of the progressive automatic press machine.

FIG. 3 is a state explanatory view showing a state in which raw material plate materials that are sequentially pressed are removed.

4 (a) to 4 (d) are explanatory views sequentially showing a state in which a die is cut by a die, an outer shape punch, and a hole punch of an automatic progressive press machine.

FIG. 5 is a state explanatory view showing a mode in which pole parking is completed in a die hole of a die of the progressive automatic press machine.

6A and 6B show a general pole parking as a plate-like product, wherein FIG. 6A is a side view and FIG. 6B is a plan view.

[Explanation of symbols]

 9 Discarded Hole Punch 10 Roughing Punch 12 Outer Punch 23 Dice 13, 28, 29 Die Hole 30 Knockout 31 Drilling Punch 40 Inner Peripheral Protrusion 42 Tip Surface 43 Tapered Surface 45 Outer Punch 51, 52, 53 Discarded Hole 51B Discarded Hole blank 52B, 53B Roughing blank 55 Shaft hole 56 Protrusion 57 C surface 60 Pole parking 60B Semi-finished product blank 61, 61a Outer surface F Arrow M Raw material plate t Inward projecting dimension

Claims (1)

(57) [Claims] 1. A die having a die hole, an outer shape punch for punching a semi-finished product blank close to a product outer shape from a raw material plate material into the die hole of the die, and an inwardly projecting inner surface of the die hole of the die. The semi-finished blank is elastically deformed so as to allow the semi-finished blank to pass through, and a tapered surface that expands rearward on the inner side surface of the inner peripheral projection. To form an outer shape punching part, to convey the raw material sheet material at a predetermined pitch in a forward direction ,
Previously punched aft and in rough punching punches arranged in the raw material sheet conveyance direction upstream side of the outer shape punching unit, the outer punch from the material sheet into the mold cavity of the die punching workpiece blanks, semi-finished products blanks punched inner circumference After further press-fitting to the position beyond the protruding part, the semi-finished product blank is pushed back in the counter-pressing direction by knockout etc. slidably arranged in the die hole of the die, and when the semi-finished product blank pushed back exceeds the inner peripheral protruding part An automatic press manufacturing method of a plate-shaped product, wherein the semi-finished product blank is plastically deformed again by being pressed against a tapered surface of an inner peripheral projection and shaped into a plate-shaped product having a substantially rectangular side cross section.