JPH1085852A - Automatic pressing method of inner gear and outer gear in gear pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic pressing method of an inner gear and an outer gear in a gear pump by progressively feeding from separate stocks. SOLUTION: On the inner gear, the inner gear with excess metal is roughly drawn, from the stock with a gear punch provided with a taper part and an expanding part in a first stage A1, a second stage B1 and a third stage C1 provided in the direction of progressively feeding the stock M1, thereafter the punched hole of the stock is expanded, next the inner gear is returned to the punched hole while drawing out the gear shape punch from the punched hole, the sectional surface of the gear is shaped by drawing the inner gear returned to the stock through a pass after progressively feeding the stock. The outer gear is likewise formed through respective processes of rough drawing, the expanding of the punched hole, punch drawing, returning the punched gear to the stock, progressive feeding, shaping of the sectional surface of the inner diameter part of the outer gear pump chamber and shaping of the sectional surface of the outer diameter part of the outer both.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner gear and an outer gear of a gear pump in which a relatively thick plate material is used as a raw material, and a general-purpose press is used to obtain a plate product having good dimensional accuracy and good appearance. Press automatic processing method.

[0002]

2. Description of the Related Art A gear pump used as an oil pump for a vehicle or the like is generally configured such that an inner gear is disposed in a pump chamber of an outer gear, and the inner gear rolls to perform a pumping action. I have. This gear pump is generally processed by punching an inner gear and an outer gear from a plate material by a press working device.

An automatic press working method of a gear pump gear recently proposed is shown in FIG.
As shown in the figure, the outer gear 13a having the pump chamber formed on the inner diameter side is punched out, and in the second step, the same figure (b) is used.
As shown in (c), by punching the outer diameter side of the inner gear 13c from the inner diameter side punching member 13b of the outer gear 13a, the inner diameter side punching member 13b of the outer gear 13a is used as the inner material.

According to such a conventional method, as shown in FIG. 1B, an inner side punching member 13b of the outer gear 13a is used.
Since the outer dimensions of the inner gear 13c partially match the outer dimensions of the inner gear 13c, there is no allowance for sizing in the inner gear 13c punched from the inner material, and the inner gear 13c has The center portion was roughly punched with a punch so that the meat flowed to the outer periphery of the inner gear 13c.

[0005] Therefore, in the conventional method, a transfer device and the like are required, so that the equipment cost is increased, and there is a problem in productivity.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and enables production of precise inner gears and outer gears without using a transfer device or the like. It is another object of the present invention to provide an automatic press working method for an inner gear and an outer gear of a gear pump which is excellent in productivity.

[0007]

SUMMARY OF THE INVENTION A method for automatically pressing an outer gear and an inner gear of a gear pump according to the present invention, which has been proposed to achieve the above object, comprises a step of processing an inner gear and a step of processing an outer gear. The processing step of the inner gear is performed by using a mold having a tooth-shaped punch composed of a punch body for punching a material plate and an expanded portion for expanding a punched hole of the material plate. Roughing out the inner gear with excess thickness from the plate material of the material dedicated to the inner gear, then expanding the punching hole of the material plate material by the expanding part of the tooth shape punch, and then removing the tooth shape punch from the punching hole of the material plate material Meanwhile, the inner gear is returned to the material plate by inserting the inner gear into a punched hole of the material plate by a knockout device of a press device. Next, the plate material of the raw material is fed forward, and the inner gear returned to the plate material of the raw material is pulled out by a finishing tooth shape punch into a mold hole located in the opposite direction or the same direction as the punching direction, so that the cut edge of the inner gear is cut. The surface is shaped, and the outer gear processing step uses a mold having an external shape punch consisting of a punch body for punching a material plate and an expanding portion for expanding a punching hole of the material plate. After punching out the inner diameter of the pump chamber type with extra thickness from the plate material made of the material for the outer gear with a punch, and then holding the punch with the outer punch, the outer diameter of the outer gear is roughly punched with the outer punch, and the outer with extra thickness A gear is formed, then the punched hole of the material plate is expanded by the expanded portion of the outer shape punch, and then the outer shape punch is pulled out from the punched hole of the material plate, The outer gear is returned to the material plate by inserting the outer gear into the punched hole of the material plate by the knockout device of the source device, and then the material plate is fed forward, and the pump chamber of the outer gear returned to the material plate is returned. At the same time, insert the finishing tooth shape punch into the inner diameter part of the pump chamber from the opposite direction or the same direction as the punching direction of the inner diameter part of the pump chamber to shape the cut surface of the inner diameter part of the pump chamber. The cutout surface of the outer gear outer diameter portion is shaped by knocking out into a finishing mold hole located in the opposite direction or the same direction as the punching direction of the outer gear outer diameter portion.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1A shows a front view of an inner gear 1 of a gear pump, and the inner gear 1 has a center hole 1a serving as a shaft hole. FIG.
Shows a front view of the outer gear 2 of the gear pump,
On the inner diameter side of the outer gear 2, a pump chamber inner diameter portion 2a on which the inner gear 1 rolls is formed.

The automatic press working method of the inner gear and the outer gear of the gear pump according to the present invention comprises a processing step of punching the inner gear 1 from a material M1 dedicated to the inner gear, and a method of punching the outer gear M2 from the material M2 dedicated to the outer gear. And a processing step of punching 2.

FIGS. 2 to 6 show the processing steps of the inner gear 1. FIG. 2 is a plan view of the lower die 3 of an automatic press machine for processing the inner gear 1 from the plate material M1 of the raw material. A third stage (C1) is provided from (A1). In addition, the plate material M1 of the material
Is fed out of a coil material, fed sequentially at a constant pitch by an uncoiler leveler feed device, and supplied to a general-purpose press device.

The upper die 4 corresponding to the first stage (A1) has a punch for punching pilot holes, and the lower die 3 has a die hole.

An upper die 4 corresponding to the second stage (B1) has a tooth-shaped punch 1 for punching an outer diameter portion with a surplus b.
1 (FIG. 3). The tooth-shaped punch 11 has a punch body 11A for punching an outer diameter portion of an inner gear 1A having a surplus b from the front end side, a tapered portion 11C, and an expanding portion for enlarging an outer punching hole 1b of the inner gear 1A having a surplus thickness. 11B is formed (FIG. 3), and the expanded portion 11B is formed.
Is set to be about 5/100 mm larger than the outer diameter of the punch body 11A, and the tapered portion 11C is for facilitating the expansion of the punched hole 1b.

The tooth-shaped punch 11 is provided with a mold hole 11D penetrating in the vertical direction.
Inside, a hole punch 11E for roughing the center hole 1a with the excess thickness a is inserted (FIG. 3). The punch 11E and the tooth punch 11 are detachably attached to a press die.

A mold hole 31 is formed in the lower mold 3 corresponding to the second stage (B1). The mold hole 31 has a knockout 32 having an inside of a mold hole 32A penetrating vertically.
Are slidably provided. The hole punch 11E is supported by an upper packing plate and fixed by an upper die set.

A knockout pin is fixed on the upper surface of the punch 11E. The knockout pin urges the knockout 11E toward the inside of a mold hole 32A of the knockout 32 described later by a driving source.

As shown in FIG. 6, the third stage (C1)
In the tooth-shaped mold hole 42 formed in the upper mold 4 corresponding to
An upper knockout 43 having a finishing die hole 43A penetrating vertically and having an outer periphery having a tooth shape is slidably provided. On the upper surface of the upper knockout 43, a knockout pin is fixed, and the knockout pin urges the upper knockout 43 toward the inside of the mold hole 33 of the lower die 3 by a driving source.

On the other hand, a finishing die hole 64 formed in the lower die 3 corresponding to the third stage (C1) has a vertically penetrating die hole 34A and an outer periphery having a tooth-shaped lower knockout. 34 is slidably provided. A knockout pin is fixedly provided on the lower surface of the lower knockout 34, and the knockout pin is connected to the lower knockout 3 by a driving source.
4 is slid along the inside of the mold hole 33 of the lower mold 3.

A punch 44 for finishing is inserted into a mold hole 34A of the lower knockout 34. The finishing punch 44 is supported by a lower packing plate and fixed to a lower die set, and is configured to be able to enter and exit the mold hole 43A of the upper knockout 43.

The processing of the inner gear 1 is performed by using the automatic press working apparatus constructed as described above. First, in the first stage (A1), pilot drilling is performed. The pilot hole 6 serves to secure a predetermined forward pitch and correct the shaking of the plate material M1.

Next, in the second stage (B1), the outer gear 2A with extra thicknesses c and d is punched. That is,
As shown in FIGS. 3B and 3C, first, the punch 1
By lowering 1E, the center hole 1a with extra
Rough. Next, as shown in FIG. 7C, after the punching punch 11E is held and the outer shape of the inner gear 1 with the excess thickness b is roughly removed by the tooth profile punch 11,
As shown in FIG.
The punched hole 1b is expanded by C and the expanding portion 11B.

The thicknesses t1 and t2 of the surplus a and b are 0.3 to
It is set to 1 mm.

The reason why the outer shape of the inner gear 1 is punched by the tooth-shaped punch 11 in a state where the punch 11E is held is to prevent secondary fracture when the outer shape of the inner gear 1 is punched. Also, punched hole 1b
The reason is that the inner gear 1A punched by the force applied to the plate material M1 during the press working becomes larger than the punched hole 1b, so that the punched hole 1b can be expanded to the punched hole 1b described later. Inner gear 1
This is to allow A to be returned.

Next, as shown in FIG.
The inner gear 1A is returned to the material plate material M1 by inserting the inner gear 1A with excess thicknesses a and b into the punched hole 1b of the material plate material M1 by using the hole punch 2 and the hole punch 1.
E is removed from the center hole 1a of the inner gear 1A. FIG. 5 is a cross-sectional view of the inner gear 1A with extra thicknesses a and b.
The upper edge of surplus a and the lower edge of surplus b
1, b1 occurs.

Next, in the third stage (C1), finish sizing of the inner diameter and the outer diameter of the inner gear 1A with extra thicknesses a and b is performed. That is, as shown in FIG. 6 (b), by inserting the finishing punch 44 into the center hole 1b of the inner gear 1A, the surplus a of the cut and the whorl a1
And the dimensional accuracy of the center hole 1b of the inner gear 1 is improved.

At the same time, as shown in FIG.
By the upper knockout 43 and the lower knockout 34,
By extracting the outer shape of the inner gear 1 into the finishing die hole 33 of the lower die 3, the excess thickness b and the dripping b1 of the outer shape of the inner gear 1 are eliminated, and the dimensional accuracy of the outer shape of the inner gear 1 is improved. I do. As a result, as shown in FIG. 7, it is possible to obtain the inner gear 1 with no dimensional accuracy and high precision.

Next, the processing steps of the outer gear 2 will be described. The processing position of the general-purpose press device for processing the outer gear 2 from the material plate material M2 is from the first stage (A2) to the third stage (C) in the forward direction of the material plate material M2.
2) is provided. In the second stage (B2), the outer diameter portion 2c of the outer gear 2 is punched after the inner diameter portion 2a of the outer gear 2 is punched. In addition, the plate material M2 of the raw material is fed out of the coil material, sequentially fed at a constant pitch by an uncoiler leveler feed device, and supplied to a general-purpose press device.

The upper die 7 corresponding to the first stage (A2) is provided with a punch for pilot drilling, and the lower die 6 is provided with a die hole.

As shown in FIG. 9, the upper die 7 corresponding to the second stage (B2) is provided with an outer shape punch 71 having a tooth-shaped mold hole 71A and a non-toothed outer periphery. The external punch 71 is detachably attached to a press die. On the outer peripheral side of the outer shape punch 71, a punch body 71B for punching an outer diameter portion with extra thickness d of the outer gear from an end side and an expanding portion 71C for expanding a punching hole 2b of the outer diameter portion of the outer gear are formed. A tapered surface 71D is formed on the outer periphery of the punch body 71B (FIG. 9).

A tooth-shaped punch 63 for roughing the inner diameter portion 2a of the outer gear of the outer gear with excess thickness c is inserted into the mold hole 62A of the knockout 62 (FIG. 9). The punch 63 is supported by an upper packing plate and fixed by an upper die set.

On the upper surface of the knockout 63, a knockout pin is fixedly provided. The knockout pin biases the knockout 63 toward the inside of a mold hole 62A of the knockout 62 described later by a driving source. The outer diameter of the expanding portion 71B is set to be about 5/100 mm larger than the outer diameter of the punch body 71A.

In a mold hole 61 formed in the lower mold 6 corresponding to the second stage (B2), a knockout 62 having a tooth-shaped mold hole 62A penetrating vertically is slidably provided.

As shown in FIG. 12, the third stage (C
In the mold hole 72 formed in the upper mold 7 corresponding to 2), an upper knockout 73 having a tooth-shaped mold hole 73A penetrating vertically is provided slidably. Upper knockout 73
A knockout pin is fixedly provided on the upper surface of the lower mold 6, and the knockout pin urges the upper knockout 73 toward the inside of the mold hole 64 of the lower mold 6 by a driving source.

On the other hand, in a finishing mold hole 64 formed in the lower mold 6 corresponding to the third stage (C2), a lower knockout 65 having a tooth-shaped mold hole 65A penetrating vertically is slidable. Has been deployed. A knockout pin is fixed to the lower surface of the lower knockout 65, and the knockout pin slides the lower knockout 65 along the inside of the mold hole 64 of the lower die 6 by a driving source.

Further, a finishing tooth profile punch 74 is inserted into the tooth shape mold hole 65A of the lower knockout 65. The finishing tooth profile punch 74 is supported by the lower packing plate and fixed to the lower die set.
The upper knockout 73 is configured to be able to enter and exit the mold hole 73A.

The processing of the outer gear 2 is performed by using the automatic press working apparatus constructed as described above. First, in the first stage (A2), drilling of the pilot hole 8 is performed. Next, the second stage (B
In 2), the outer gear 2A with the extra thicknesses c and d is punched.

That is, as shown in FIGS. 9B and 9C, first, the punch 63 is moved downward,
The pump chamber-shaped inner diameter portion 2a with the excess thickness c is roughly removed. next,
As shown in FIG. 9C, after the outer gear outer diameter portion 2c with the excess thickness d is roughly removed by the outer shape punch 71 in a state where the punch 63 is held, as shown in FIG. Taper 71D and expanded portion 71C of external punch 71
Thereby, the punched hole 2b is expanded.

The thicknesses t3 and t4 of the surplus portions c and d are 0.3 to
It is set to 1 mm.

The punching of the outer gear outer diameter portion 2c by the outer shape punch 71 in a state where the punch 63 is held is performed in the same manner as the above-described processing step of the inner gear 1.
This is to prevent secondary fracture. The reason why the punched hole 2b is expanded is to allow the outer gear 2A with the excess thickness c and d to be returned to the punched hole 2b, as in the above-described processing step of the inner gear 1.

Next, as shown in FIG. 10, the outer gear 2A is returned to the material plate M2 by knocking out the outer gear 2A with excess thickness c and d into the punched hole 2b of the material plate M2. , Hole punch 6
3 is removed from the pump chamber inner diameter portion 2a of the outer gear 2A. FIG. 11 is a cross-sectional view of the outer gear 2A with extra thicknesses c and d. In the upper edge of the extra thickness c and the lower edge of the extra thickness d, the curls c1 and d1 are formed by punching.

Next, in the third stage (C2), finish sizing of the inner diameter and the outer diameter of the outer gear 2A with extra thicknesses c and d is performed. That is, as shown in FIG. 12 (b), by inserting the finishing tooth-shaped punch 74 into the inner diameter part 2a of the pump chamber shape of the outer gear 2A, the excess thickness c and the dripping c1 of the cut are eliminated and the outer gear 2 The dimensional accuracy of the pump chamber inner diameter portion 2a is improved.

At the same time, as shown in FIG.
By the upper knockout 73 and the lower knockout 65,
The outer diameter portion 2c of the outer gear is fixed to the finishing die hole 64 of the lower die 6.
By removing the outer gear 2c, the extra thickness d and the dripping d1 of the cut of the outer gear outer diameter 2c are eliminated, and the dimensional accuracy of the outer diameter 2c of the outer gear 2 is improved. As a result, as shown in FIG. 13, it is possible to obtain the outer gear 2 with no dimensional accuracy and high dimensional accuracy.

As described above, according to the automatic press working method of the inner gear and the outer gear of the gear pump of the present invention, the dimensional accuracy and appearance are good, and particularly, the inner gear 1 having extremely high dimensional accuracy in the precision die-cut portion. And the outer gear 2 can be produced, and a smooth pump operation can be performed. Further, in a series of press working steps, press work can be performed by progressive feeding, so that productivity is improved.

The automatic press working apparatus is not limited to the above-described embodiment, but can be designed and modified in shape, arrangement position, etc. of punches and mold holes.

[0044]

As is apparent from the above description, according to the automatic press working method of the external gear and the internal gear of the gear pump of the present invention, the inner gear is processed by punching a plate material. Using a tooth-shaped punch consisting of a punch body and an expanded portion for expanding the punched hole, the inner gear once punched is returned to the punched hole, and then the punch is removed in the direction opposite to the punching direction, so that the cut surface is cut. Can be shaped.

For the processing of the outer gear, a plate material made of a material dedicated to the outer gear is used, and an outer shape punch composed of a punch body for punching the material plate material and an expanding portion for expanding a punching hole is used. The cut surface can be shaped by returning the once punched outer gear to the punched hole and then pulling it out in the direction opposite to the punching direction.

As a result, precise inner gears and outer gears can be produced, and there is no need to use a transfer device or the like, and only one press device is required.
Since the gear can be processed by the progressive die, it is advantageous in terms of equipment cost. In addition, the plate material of the material from which the gears (the inner gear and the outer gear) are returned is fed forward, and the gear is removed from the material plate at the next processing position, so that a precise gear can be obtained in a series of press working steps. Therefore, productivity is also improved.

[Brief description of the drawings]

FIG. 1 is a front view of an inner gear and an outer gear.

FIG. 2 is a plan view showing a processing position of an inner gear of the automatic press working apparatus according to the present invention.

FIG. 3 is an explanatory view sequentially showing a roughing mode of an inner gear by an automatic progressive press working apparatus;

FIG. 4 is an explanatory view sequentially showing a roughing mode of an inner gear by an automatic progressive press working apparatus;

FIG. 5 is a cross-sectional view showing an inner gear with extra thickness.

FIG. 6 is an explanatory diagram showing a mode of finishing an inner gear by an automatic progressive press machine.

FIG. 7 is a sectional view showing a sized inner gear.

FIG. 8 is a plan view showing a processing position of an outer gear of the automatic press working apparatus according to the present invention.

FIG. 9 is an explanatory diagram sequentially showing a roughing mode of the outer gear by the automatic progressive press machine;

FIG. 10 is an explanatory view sequentially showing a punching mode of an outer gear by an automatic progressive press working apparatus;

FIG. 11 is a cross-sectional view showing an outer gear with extra thickness.

FIG. 12 is an explanatory view showing an aspect of finishing an outer gear by an automatic progressive press machine.

FIG. 13 is a sectional view showing a sized outer gear.

FIG. 14 is a front view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner gear 2 Outer gear 2a Pump chamber inner diameter part M1, M2 Material plate material 11 Toothed punch 11A Punch body 41B Expanding part 1b Punching hole 71 External punch 71B Punch body 71C Expanding part 2b Punching hole

Claims (1)

[Claims] 1. A process for machining an inner gear, and a process for machining an outer gear having an inner diameter portion with a pump chamber in which the inner gear rolls. The machining process for the inner gear includes a step for punching a plate material. Using a die equipped with a toothed punch consisting of a punch body and an expanded part for expanding the punched hole of the material plate, first, the inner gear with extra thickness is roughly removed from the material plate for the inner gear by the toothed punch. Then, the punched hole of the material plate is expanded by the expanding portion of the tooth-shaped punch. Next, the tooth gear punch is pulled out from the punched hole of the material plate, and the inner gear is connected to the material plate by the knockout device of the press device. The inner gear is returned to the plate of the material by inserting the inner gear into the punched hole, and then the plate of the material is fed forward, and the inner gear is returned to the plate of the material. By cutting the wheel into a mold hole located in the opposite direction or the same direction as the punching direction by a finishing tooth profile punch, the cut surface of the inner gear is shaped, and the outer gear processing step is for punching a plate material. Using a die equipped with an external punch consisting of a punch body and an expanded portion for expanding the punched hole of the material plate, firstly, the inner diameter of the pump chamber with extra thickness is formed by punching a hole from the material dedicated to the outer gear. After roughing, the outer diameter portion of the outer gear is roughened by the outer punch with the punch being held to form an outer gear with extra thickness. The punching hole is expanded, and then the outer punch is pulled out from the punching hole of the material plate, and the outer gear is pulled out of the material plate by the knockout device of the press device. The outer gear is returned to the material plate by inserting it into the punched hole. Next, the material plate is fed forward, and the finishing tooth shape punch is placed in the pump chamber shape inner diameter part of the outer gear returned to the material plate. The cut surface of the inner diameter part of the pump chamber is shaped by inserting it in the opposite direction or the same direction as the punching direction of the inner diameter part, and at the same time, the outer gear returned to the material plate is knocked out and the direction opposite to the punching direction of the outer gear outer diameter part. Alternatively, a method for automatic press working of an inner gear and an outer gear of a gear pump, wherein a cut surface of an outer diameter portion of the outer gear is shaped by extracting into a finishing mold hole located in the same direction.