JP2567780B2 - Engine manifold flange manufacturing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an engine manifold flange.

[0002]

2. Description of the Related Art Conventionally, when manufacturing an engine manifold flange, the main manufacturing method is often a blanking press (hereinafter simply referred to as an FB press) for punching a plate-shaped material into a required shape. The fine blanking process uses a special FB press machine to drive a special wedge called a material presser into the material, and by giving a strong pressure to the counter as well, a special stress is applied to the material during punching, and the punch and female die This is a method of punching with a very small clearance. It is a processing method that finishes the cut surface by these operations in the same way as cutting. The FB press machine is a special press machine manufactured in Switzerland, West Germany, the United Kingdom, etc. It is a very expensive press machine including engine yarding, and it takes a great deal of skill to manufacture a special mold. However, the mold maintenance cost is also high.

[0003]

[Problems of the prior art] However, as a problem in processing by the FB press machine, a prominent portion of a product is liable to be dripped or cracked, and the problem has not yet been solved. Further, a draft taper also occurs, and the flange thickness is 4.5 to 6.
The occurrence of 0.04 to 0.07 mm punch taper at 0 mm is recognized, and at the same time, the product price becomes very high.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and uses an inexpensive general-purpose press machine to reduce the running cost with a simple mold structure. An object is to provide a method for manufacturing an engine manifold flange superior to an FB press machine.

[0005]

According to the present invention, a female die has a taper portion at an upper entrance and a die hole having a straight portion, a reverse taper portion and a relief portion is formed following the taper portion. In addition, an inner diameter punch having an upper chamfer is provided in the center of the die hole, a plate-shaped material is placed on the female die, and the material is supported by lifter pins from below so that the material floats from the female die. With a punch having an inner diameter female die having a lower chamfer in its center, a material is pressed into the female die, and the material is lowered through the female die to provide an inner diameter hole 1
A method for manufacturing an engine manifold flange is provided, which comprises molding a next product and then pressing the primary product from below the female die by a counter to pass the die hole above the female die to obtain the product. . Since the clearance between the female die and the punch and the inner diameter punch and the inner diameter female die inside the punch is made small,
The manufacturing method of the present invention, which has a purpose of preventing the blade portions of the mold from hitting each other, and a clean finish of the cut surface of the outer peripheral portion and the inner diameter hole portion of the product, is a taper portion of the female die inlet. And by providing the inner chamfer with an upper chamfer.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view showing a mold in an embodiment of the method of the present invention. According to the present invention, the female die 3 is attached to the lower die, the punch 1 is attached to the upper die, and the primary product enters the lower female die 3 and is pushed up to the upper surface of the female die 3 by the counter 2, and air pressure or cylinder pressure is applied. It depends on the method of discharge.

The configuration of FIG. 1 will be described. The counter 2 is provided in the counter holder 4 so as to be vertically movable. The stripper 5 is slidable up and down on the punch 1 so that the elastic material 10
Is suspended from the punch plate 7. The punch 1 is held on a punch plate 7 by a punch holder 6. The push-up pin 8 pushes up the counter 2 when the pressure body 21 receives pressure from below. The material 9 is automatically fed at a constant interval from the left side of FIG. 1 by a feeding device, and is lifted by the lifter pin 11 from the female die 3 and the female die holder 22.

A slide knock out bar 12 is provided above the press slide 23. A knockout pin 13 is provided on the press slide 23 so as to be vertically movable. Dust removal knockout pin 14 is punch plate 7
Also, the punch 1 is provided so as to be movable up and down.

An inner diameter punch 19 is installed at the center of the inner diameter of the female die 3, and the inner diameter punch 19 is held by a lower die 24 by an inner diameter punch holder 15. Air hole 16
The counter holder 4 is perforated. Internal diameter female 17
Are punched in the center of the inner diameter of the punch 1.

The internal structure of the female die 3 is as shown in FIG. 2, and there is an entrance taper portion 3a at the upper entrance. The angle of the inlet taper portion 3a is 20 ° to 150 °, and an appropriate angle is experimentally determined. A straight portion 3b having a standard size, a reverse taper portion 3c having an angle of 20 ° to 150 °, and a relief portion 3d are provided following the inlet taper portion 3a. The inner diameter of the relief portion 3d is 1 from the standard dimension of the straight portion 3b.
Expand from 0 μm to 200 μm. Female die 3 and punch 1,
Since the clearance between the inner diameter punch 19 and the inner diameter female die 17 is made small, the purpose is to prevent the blade portions of the mold from hitting each other, and the cutting of the outer peripheral portion 20a and the inner diameter hole 20b of the product 20 shown in FIG. The method of the present invention, which takes into consideration a clean finish of the surface, can be solved by providing a chamfered portion 19a at the tapered portion 3a of the inlet of the female die 3 and the tip of the inner diameter punch 19.

FIG. 4 is a side view showing the inner diameter punch 19. FIG. 4A shows an example in which the upper chamfer of the inner diameter punch 19 is provided with a radius 19a having a radius of about 5% of the diameter of the inner diameter punch 19. FIG. 4B shows an example in which the chamfered portion 19b of about 5 ° is provided as the upper chamfered portion of the inner diameter punch 19, and the upper circle diameter Y of the square chamfered portion 19b is about 60% of the diameter φ of the inner diameter punch 19. Y = 0.6φ FIG. 4 (c) shows 2 / as the upper chamfered portion of the inner diameter punch 19.
An example in which a taper chamfer 19c of 100 mm is provided is shown, and the diameter φ of the inner diameter punch 19 and the dimension X of the starting point of the taper chamfer 19C are equal, for example, X and φ are 10 mm. X≈φ Further, as shown in FIG. 4C, a rounded portion may be provided on the upper portion of the tapered chamfer 19c. R chamfer 19
a, the oblique chamfer 19b and the tapered chamfer 19c are selected according to the size of the inner diameter hole 20b of the product 20, the size and thickness of the product 20, the hardness of the material, and the like.

The inner diameter female die 17 formed at the center of the punch 1 has a lower chamfer 1 at the lower entrance as shown in FIG.
7a. The lower chamfer 17a has a corner chamfer of .alpha..degree. = 5.degree.-60.degree. Or has a small radius round chamfer. Whether the lower chamfer 17a is chamfered or rounded is determined by the plate thickness of the material 9. The inner diameter female die 17 has a straight portion 17b following the lower chamfered portion 17a.

Next, the operation will be described. As shown in FIG. 1, the mold of the present invention is a very simple mold. The material 9 is placed on the lifter pin 11 and moved from the left side to the right side by a feeding device (not shown). It can be moved to the left or right, but it is determined by the factory layout and the post-process of the product. FIG. 1 illustrates a method of moving from left to right. When the press slide 23 descends, the stripper 5 first hits the material 9. The stripper 5 is constantly pressed downward by the elastic material 10. On the other hand, material 9
The lifter pin 11 that serves to lift the slab to a predetermined height maintains a height about twice the thickness of the material 9 from the upper surface of the female die 3. At this time, since the pressure of the upper elastic material 10 of the stripper 5 is stronger than the material lifting pressure of the lifter pin 11, the stripper 5 pushes down the lifter pin 11 and the material 9 together as the press slide 23 descends. Reach the top. A counter 2 is built in the female die 3, and an inner diameter female die 17 is also provided in the inside of the punch 1 in the form of a through hole, and a slight lower portion is provided at the hole entrance as shown in FIG. The chamfered portion 17a is provided. An internal punch 19 for punching an internal hole 20b of the product 20 is also prepared inside the counter 2, and the outer periphery 20a and the inner diameter hole 20b of the product 20 are processed at the same time.
The punch 1 reaching the upper surface of the female die 3 enters into the female die 3. At this time, at the same time, the product 20 that is about to be cut from the material 9 enters deep into the female die 3,
The inner diameter punch 19 starts to bite into the product 20 in order to push down together with the push-up pin 8 at the bottom of the counter 2.
The inner diameter punch 19 starts to hit the inner diameter female dance 17 provided on the inner diameter of the upper punch 1 to punch the inner diameter hole 20b into the product 20.

As described above, the internal structure of the female die 3 is as shown in FIG. 2, and the product 20 has the entrance tapered portion 3a, the standard straight portion 3b, the reverse tapered portion 3c, and the escape portion 3d in this order. Go in. Since the clearance between the female die 3 and the punch 1 and the inner diameter punch 19 and the inner diameter female die 17 is made small, the purpose of preventing the blade portions of the mold from hitting each other and the outer circumference 2 of the product 20.
According to the method of the present invention in which the cut surfaces of the 0a portion and the inner diameter hole 20b are considered to be clean, the inlet taper portion 3a of the female die 3 and the tip of the inner diameter punch 19 are round chamfered 19a shown in FIG. Square chamfer 19b, tapered chamfer 19c
It is solved by providing.

The product 20 is a taper portion 3 of the entrance of the female die 3.
a, the straight portion 3b, and the reverse taper portion 3c to reach the relief portion 3d, and the press machine reaches the bottom dead center. At this time, the product 20 is a taper that is forcibly made when passing through the reverse taper portion 3c. No. 20 on the outer circumference 20a, and 0.
It has expanded about 03 to 0.15 mm. Product 20 as it is
Is pushed out onto the female die 3 by the counter 2, and the product 20 has a taping taper and is dripped.
In the present invention, the strong pressure of the lower pressure body 21 is used to make the product 20 deeper than the female die 3 from the relief portion 3d, the reverse taper portion 3c, and the straight portion 3b.
And is extruded onto the upper surface of the female die 3 through the inlet taper portion 3a. By the press machine pressure and the action of the lower pressure body 21, one stroke makes two processings at the same time, which produces a great effect.

Straight portion 3b and escape portion 3d having standard dimensions
Although the difference in the dimension depends on the thickness of the product 20, the thicker it becomes, the outer peripheral portion 20a of the product 20 expands and expands. Therefore, it becomes necessary to increase the dimension of the relief portion 3d.

The length of the inner diameter punch 19 is the same as the height of the upper surface of the straight portion 3b of the female die 3.
The upper surface of is set. This is because the punch 1 bites into the material 9 and an unreasonable pressure is generated at the entrance taper portion 3a of the female die 3, and in particular, the irregular pressure toward the center of the product 20 is concentrated on the outer circumference of the inner diameter punch 19. This is a process for preventing the inner diameter punch 19 from being easily broken. Since the irregular pressure of the product 20 is lowered by the pressure of the counter 2 in the straight portion 3b, the work of opening the inner diameter hole 20b from that point It is possible to extend the life of the inner diameter punch 19 when it is started.

In the descending stroke of the press machine, the slag is not generated when the outer periphery is punched, but is generated when the inner diameter hole is punched.
Since this slag is left in the punch 1, when the press machine reaches the top dead center, the knockout pin 13 is pushed by the slide knockout bar 12 to push down the slag removal knockout pin 14, and the slag is discharged to the outside.

During the ascending stroke of the press machine, the female die 3
At the time of discharging the product 20 due to the pressure of the counter 2 in the inner recess 3d, a slight amount of slag is generated in the female die 3 at the time of the punching taper and the drooping removal processing, so that the removal work is required. Since it is very difficult to mechanically perform the removing work, an air hole 16 is formed in the counter holder 4, and high pressure air is blown into the air hole 16 to constantly clean the inside of the female die 3. It is necessary to keep.

[0020]

As described above, in the engine manifold flange manufacturing method of the present invention, the female die has the tapered portion at the upper inlet and the straight portion, the reverse taper portion and the relief portion follow the tapered portion. An inner diameter punch having an upper chamfered portion is provided in the center of the die hole while forming a die hole, and a plate-shaped material is placed on the female die,
In a state where the material is supported by lifter pins from below so as to float from the female die, the material is pressed into the female die by a punch having an inner diameter female die having a lower chamfered portion at the entrance and formed in the center, After forming a primary product with an inner diameter hole by lowering the material through the female die, the primary product is pressed from below the female die by a counter to pass through the die hole above the female die. Since it is a product, it is possible to punch the outer periphery of the flange and punch the inner diameter hole in one stroke during the descending stroke and ascending stroke of the press machine, and also to finish the cut surface of the outer peripheral portion and the inner diameter hole cleanly. Moreover, there is an excellent effect that the general-purpose press machine can be used without the need for an expensive FB press machine.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a mold in an embodiment of the method of the present invention.

FIG. 2 is a half sectional view showing the internal structure of a female die.

FIG. 3 is a plan view and a cross-sectional view showing a product.

FIG. 4 is a side view showing an inner diameter punch.

FIG. 5 is a sectional view showing an internal structure of an inner diameter female die.

[Explanation of symbols]

1 ... punch, 2 ... counter, 3 ... female die,
3a ... inlet taper part, 3 ... straight part, 3c ...
Reverse taper part, 3d ... Escape part, 9 ... Material, 11 ...
Lifter pin, 17 ... Female die for inner diameter, 17a ... Lower chamfer, 19 ... Inner diameter punch, 19a ... R chamfer, 19b ... Tapered chamfer, 20 ... Product, 2
0 '... Primary product.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location F01N 7/08 F01N 7/08 E F02M 35/104 F02M 35/10 102N

Claims (1)

(57) [Claims] 1. A manufacturing method for press-molding an engine manifold flange, wherein a female die has an inlet taper portion at an upper inlet, and a die hole having a straight portion, a reverse taper portion and a relief portion is provided following the inlet taper portion. A state in which an inner diameter punch having an upper chamfered portion is provided in the center of the die hole, and a plate-shaped material is placed on the female die, and the material is supported by lifter pins from below so that the material floats from the female die. Then, by pressing a material into the female die with a punch having an inner diameter female die having a lower chamfered portion at the inlet in the center, and lowering the material through the female die, a primary hole with an inner diameter hole is formed. After molding the product, press the primary product from below the female die by a counter to pass the die hole above the female die to obtain the product. Engine manifold flange product method characterized by.