JPH1177179A - Method for removing beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely restrain the internal beam released from a work on an upper die. SOLUTION: The internal beam 32 inclined by an angle θ1 to a horizontal surface, is released from an annular part 30 by pressing it with a center punch 20 having a pressing surface 24 inclined by an angle θ2 (θ1 >θ2 >=0) smaller than the angle θ1 to the horizontal surface. When the internal beam 32 is abutted on the pressing surface 24 while the internal beam 32 is positioned in the upper die 1, since the internal beam 32 is inclined by an angle smaller than the angle θ1 to the horizontal surface, the internal beam 32 is restrained on the inner peripheral surface of the die 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing an inner burr from a work formed by press molding, forging or the like and having at least an inner burr, and reliably separating the inner burr from the work. The present invention relates to a method for removing burrs that prevents falling of burrs.

[0002]

2. Description of the Related Art In a manufacturing method such as press molding or forging, a burr removing step for removing burrs generated on a product surface in a molding step is required. After the deburring step, processing steps such as coining and bending are often performed. Therefore, in order to improve productivity, it is desirable that the forming step, the deburring step, and the processing step be performed on an integrated automatic line. For that purpose, it is necessary to reliably separate the work and the burr without using manual work, and to convey only the work in the line.

In the case of a work having an annular portion,
Since outer burrs and inner burrs are generated on the outer peripheral surface and the inner peripheral surface of the annular portion, it is necessary to remove both the outer burrs and the inner burrs. In such a case, the outer burrs are punched by an outer punching die while holding the work on the die, and the inner burrs are punched by the upper punch. In this case, the outer burr is held by the die, the inner burr falls downward from the punch hole provided in the die, and the inner peripheral surface of the annular portion adheres to the outer peripheral surface of the upper punch and is separated from the outer burr and the inner burr. Is done.

However, in the above-described deburring method, there are problems that the inner burr adheres to the end face of the upper punch and does not fall, or that the annular portion is insufficiently adhered to the upper punch and falls during transportation. Was. In such a case, it is necessary to stop the apparatus and manually move the annular portion and the inner burrs to a predetermined position, which is troublesome and has led to a reduction in productivity such as a stop of the production line.

Accordingly, Japanese Utility Model Laid-Open No. 5-76636 discloses that
A burr removing device is disclosed in which a notch is provided on an outer peripheral surface of an upper punch and an air eject hole is provided at a lower end surface of the upper punch. According to this deburring device,
The inner surface of the annular portion surely bites into the outer surface of the upper punch due to the indentation, and the inner burr adhered to the end surface of the upper punch can be dropped by blowing air from the air eject hole. Therefore, the annular portion and the inner burr can be reliably separated without stopping the apparatus, and the productivity is improved.

[0006]

However, the deburring apparatus disclosed in the above publication has a configuration in which the annular portion is locked and held by the outer peripheral surface of the upper punch. Therefore, there is no problem when the annular portion is located at the center of gravity of the work, but when the annular portion is located at a position deviated from the center of gravity of the work, the annular portion after burr punching is supported at a position away from the center of gravity. Therefore, it becomes unstable and may drop during the conveyance.

Accordingly, the applicant of the present application has filed Japanese Patent Application No. 9-1049.
In No. 33, the upper portion and the lower portion sandwich the annular portion, press the inner burr relatively upward with a core punch to remove the inner burr, and lock the inner burr on the inner peripheral surface of the upper portion. A method of separating the annular portion and the inner burr by using the method is disclosed. According to this deburring method, the inner burr is locked and held on the inner peripheral surface of the upper mold, so that the inner burr is prevented from dropping from the upper mold, and only the annular portion can be automatically conveyed.

In order to lock the inner burr on the inner peripheral surface of the upper mold, the clearance between the inner diameter of the upper mold and the outer diameter of the separated inner burr must be at least partially set to zero or less. Becomes On the other hand, when the inner burrs are pressed by the centering punch and positioned in the upper mold, a predetermined value or more between the inner peripheral surface of the upper mold and the outer peripheral surface of the centering punch in order to prevent the mold from being damaged. Clearance is required.

Therefore, in the above-described deburring method, the outer peripheral shape of the separated inner burr determined by the shape of the pressing surface of the core punch may be smaller than the inner peripheral shape of the upper die. Is uncertain. The present invention has been made in view of such circumstances, and it is an object of the present invention to prevent breakage of a mold and securely lock an inner burr separated from a work to an upper mold.

[0010]

Means for Solving the Problems Claims for solving the above problems
The feature of the deburring method described in Item 1 is that the upper die and the lower die
Of the annular part with the core punch
Press the inner burr formed on the surface into the upper mold to work
Is a deburring method that removes inner burrs from
Angle θ₁Angle of inclined inner burr to horizontal plane θ₁Yo
Smaller angle θ _Two(Θ₁> Θ_Two≧ 0) The inclined pressing surface
Press with a core punch to separate the inner burr from the annular part,
The inner burr abuts on the pressing surface while the inner burr is located in the upper mold
And the angle θ₁Incline at a smaller angle to horizontal
That is, the inner burr is locked to the inner peripheral surface of the upper die.

A feature of the deburring method according to the second aspect is that the upper die and the lower die sandwich a work having an annular portion and remove the inner burr formed on the inner peripheral surface of the annular portion by a core punch. to press the upper mold in a burr bleeding removing the inner burr from the work, to press the burrs inner angularly theta ₁ inclined relative to a horizontal plane by the pressing surface of the coring punch separating the annular portion and the inner burr ,
Be inclined relative to a horizontal plane a pressing pin provided in the coring punch inner burrs and press the inner burrs protrude from the pressing surface angle theta ₁ at smaller angles in a state where the inner burr is positioned within the upper die To lock the inner burr on the inner peripheral surface of the upper die.

[0012]

In the deburring method according to the present invention, the inner burr formed in the annular portion is inclined at an angle θ _{1 with} respect to the horizontal plane, and the pressing surface of the core punch is formed in the horizontal plane. angle theta ₂ inclined against, the angle theta ₁ and the angle theta ₂ in the relation of θ _1> θ ₂ ≧ 0. Then, the annular portion is sandwiched between the upper die and the lower die, and the inner burr is pressed into the upper die by the pressing surface of the centering punch provided in the lower die. As a result, a shear stress is generated between the annular portion and the inner burr, so that the inner burr is cut from the annular portion.

In order to prevent the mold from being damaged, a clearance of a predetermined value or more is provided between the inner peripheral surface of the upper die and the outer peripheral surface of the core punch. And in Bali vent previous state, the projection shape of the horizontal surface of the burr inner inclined at an angle theta ₁ is substantially the same as the inner peripheral shape of the upper mold. However coring punch, θ _1> θ ₂ ≧ 0 for inclined from the horizontal plane at an angle theta ₂ to the relationship, the inner burr is middle angle theta ₁ of the burr vent by coring punch changes theta ₂ Approach. Also, even if the inner burr maintains the angle θ ₁ during deburring, the inner burr moves by its own weight along the pressing surface after being separated from the annular portion, so the angle θ ₁ changes and approaches the angle θ ₂ .

That is, when the inner burr is separated from the annular portion at the latest, the inner burr forms an angle θ _x (θ ₁ > θ) smaller than the angle θ _1.
x ≧ θ ₂ ), and the size of the projected shape on the horizontal plane is partially larger than the size of the inner peripheral shape of the upper die. Therefore, by pushing the inner burr into the upper mold with the core punch, the inner burr separated from the annular portion can be securely locked and held on the inner peripheral surface of the upper mold. As a result, the inner burr is reliably prevented from dropping from the upper mold, so that only the annular portion can be automatically conveyed.

[0015] In the deburring method according to the second aspect,
The inner burr inclined at an angle θ1 with respect to the horizontal plane is first pressed by the pressing surface of the core punch to separate the annular portion and the inner burr. At this time, the inclination angle theta ₂ with respect to the horizontal plane of the pressing surface of the coring punch if the relationship of θ _1> θ ₂ ≧ 0, the inner burr as described above are reliably engaged to the upper die. But θ ₁
In the case of ≦ theta ₂ is in this state it may be engaging the inner burr upper die becomes difficult.

According to the second aspect of the present invention, in the state where the inner burr is located in the upper mold, the pressing pin provided on the core punch is projected from the pressing surface to press the inner burr. It is inclined relative to the horizontal plane the burr at a small angle than the angle theta _1. As a result, the size of the projected shape of the inner burr on the horizontal plane is partially larger than the size of the inner peripheral shape of the upper die, so that the inner burr separated from the annular portion is securely engaged with the inner peripheral surface of the upper die. It can be stopped and held. Therefore, since the inner burr is reliably prevented from falling from the upper mold, only the annular portion can be automatically conveyed.

[0017] The inside burr moves so as to be inclined with respect to the horizontal plane at a small angle than the angle theta ₁ is them pushed relatively upward by the pressing pin portion located relatively below the burr inner inclined I just need. Then, after the inner burr is locked to the upper mold, the centering punch is relatively lowered together with the pressing pin, so that only the annular portion can be automatically conveyed.

The movements of the upper die, the coring punch and the pressing pin are relative, and when separating the inner burr from the annular portion, even if the coring punch is raised with the upper die fixed. The same is true even if the upper die is lowered while the core punch is fixed. When an outer burr is provided on the outer periphery of the annular portion, it is preferable that the outer burr separated from the annular portion be locked and held by a locking portion provided on the outer periphery of the upper die. Accordingly, the outer burr and the inner burr can be simultaneously locked and held by the upper mold, and the separation of the burr and the removal of the annular portion can be performed more reliably.

That is, according to the deburring method of the present invention,
Since the annular portion remains in the lower mold, problems such as dropping of the annular portion caused by holding the annular portion at a position deviated from the center of gravity as in a conventional deburring device are avoided. In addition, since at least the inner burr is securely locked and held by the upper mold, the inner burr is securely separated from the annular portion without falling. As a result, manual work and stoppage of the apparatus are avoided, and productivity is significantly improved.

[0020]

The present invention will be specifically described below with reference to examples and comparative examples. (Embodiment 1) FIGS. 1 and 2 show a deburring apparatus of Embodiment 1. FIG. This deburring device includes an upper die 1 and a lower die 2, and is configured to dispose a work 3 between the upper die 1 and the lower die 2 to deburr.

The work 3 is formed by forging.
Protruding from the cylindrical annular portion 30 and the outer periphery of the annular portion 30
An outer burr 31 and an inner burr 32 formed in the annular portion 30;
It is composed of This work 3 consists of an upper mold 1 and a lower mold 2
The inner peripheral surface of the annular portion 30 is vertically
And the inner burr 32 has an angle θ between the front and back sides with respect to the horizontal plane.
₁It is inclined.

The upper die 1 can be moved up and down by a press stroke of a crank press, and is provided at a center of the cylindrical portion 10 having a holding surface 11 having a projection shape of a plan view of the annular portion 30 at a tip thereof, and a center of the cylindrical portion 10. And a knockout pin 12 which is relatively movable in the axial direction. This cylindrical part 10
Has a tapered surface 13 whose inner peripheral surface has a constant cross section, but whose outer peripheral surface has a thickness that increases with distance from the clamping surface 11 at the tip.

The lower die 2 includes a coring punch 20, a tray 21 disposed on the outer periphery of the coring punch 20 and having a receiving surface 22 having a substantially planar projection shape of an annular portion 30, and an inner periphery of the outer peripheral shape of the annular portion 30. And a cutting blade 23 having a blade. The centering punch 20 is connected to a hydraulic device (not shown) and is arranged so as to be movable up and down. A hydraulic cushion spring (not shown) for urging the tray 21 upward is arranged below the tray 21. A pressing surface 24 that is inclined at an angle θ ₂ (θ ₁ > θ ₂ ≧ 0) with respect to a horizontal plane is formed at the tip of the centering punch 20.

In this deburring apparatus, the work 3 is first placed so that the annular portion 30 is positioned on the tray 21.
The outer burr 31 is placed on the cutting blade 23.
In this state, as shown in FIG. 1, the radial length of the cylindrical portion 10 of the upper die 1 is L, the radial length of the inner burr 32 is L ₁ , and the radial length of the pressing surface 24 is L. Assuming that L ₂ , the respective components are configured to satisfy the following relationship.

L = L ₁ cos θ ₁ , L <L ₂ , L> L ₂ cos θ ₂ Next, the upper die 1 descends, and after the holding surface 11 abuts on the annular portion 30 as shown in FIG. The tray 21 is pressed downward through the portion 30 against the urging force of a hydraulic cushion spring (not shown). On the other hand, downward movement of the outer burr 31 is restricted by the cutting blade 23. As a result, a shearing force acts between the outer burr 31 and the annular portion 30, and as shown in FIG. 2, the ring-shaped outer burr 31 is cut at the base by the cutting blade 23 and separated from the annular portion 30.

When the upper mold 1 is further lowered, the ring-shaped outer burr 31 engages with the outer tapered surface 13 of the tubular portion 10 and is locked and held by the tubular portion 10. On the other hand, the core punch 20 rises from the lower die 2, and first, the lowermost end of the inner burr 32 and the lowermost end of the pressing surface 24 come into contact with each other to press the inner burr 32 upward. As a result, a shearing force acts between the annular portion 30 and the inner burr 32, and the inner burr 32 is cut from the lowermost end. Then, the centering punch 20 is further raised and the upper die 1
As a result, the inner burr 32 is completely separated from the annular portion 30 and the separated inner burr 32 is placed on the surface of the pressing surface 24. As shown in FIG. an inclined state at an angle theta _2.

Θ₁> Θ_TwoMore cos θ₁<Cos θ_Twoso
L₁cos θ₁= L <L ₁ cos θ_TwoAnd the core punch 20 rises further
The inner burr 32 separated by the lowering of the upper mold 1 and the
10 is locked to the inner peripheral surface. At this time, the cylindrical portion 10
Worn inner surfaces may make locking difficult.
You. In such a case, the straw of the core punch 20 may be used.
The inner burr 32 is not worn by increasing the
It can be locked further up. Therefore, upper mold 1
Longer mold life
Improve.

After deburring, the upper die 1 rises and the core punch 20 descends. Outer burr 31 cut from annular portion 30
Since the inner burr 32 and the inner burr 32 are respectively locked and held by the tubular portion 10, they rise without dropping together with the tubular portion 10, and the state in which the annular portion 30 is placed on the receiving tray 21 is maintained. As a result, the annular portion 30 is fixed to the outer burr 31
2 and separated. The receiving tray 21 and the annular portion 30 are raised by the urging of a hydraulic cushion spring (not shown), and the annular portion 30 protrudes upward from the cutting blade 23, so that the annular portion 3
0 can be conveyed.

The outer burr 31 and the inner burr 32 held by the cylindrical portion 10 are knocked out with an outer ballistic slipper (not shown) provided on the outer periphery of the cylindrical portion 10 after the upper mold 1 is moved to another position. The pin 12 is separated from the cylindrical portion 10 by driving, and is discharged out of the press. That is, according to the deburring method of the present embodiment, the lower surface of the annular portion 30 is
Since it is stably supported in a state where it is mounted on 1, no trouble such as dropping occurs. Further, the outer burr 31 and the inner burr 32 separated from the annular portion 30 are securely locked and held by the tubular portion 10, so that they are prevented from dropping. Therefore, the outer burr 31 and the inner burr 32 can be reliably removed from the work 3, and the annular portion 30 separated from the outer burr 31 and the inner burr 32 can be stably transported to the next step.

(Embodiment 2) In this embodiment, as shown in FIG.
This embodiment is the same as the first embodiment except that the pressing surface 24 is provided so as to be able to advance and retreat, and the inclination angle θ _{2 of} the pressing surface 24 with respect to the horizontal plane is the same as the inclination angle θ ₁ of the inner burr 32 (θ ₁ = θ ₂ ). . The pressing pin 25 is driven by a hydraulic drive to press the pressing surface 24.
Is configured to enter and exit from the vicinity of the lowermost end.

In the present embodiment, the core punch 2
0 rises, and the pressing surface 24 first contacts the inner burr 32 on the entire surface to press the inner burr 32 upward. Thereby, the annular portion 3
A shear force acts between the zero and the inner burr 32, and the inner burr 32 is separated from the annular portion 30. In this state, L ≧ L ₁ c
Since in osθ _2, burr 3 among separated annular portion 30
2 is located inside the tubular portion 10 without being locked to the tubular portion 10.

Next, the pressing pin 25 advances from the coring punch 20 and projects from the pressing surface 24. Then, as shown in FIG. 4, the inner burr 32 is moved in the direction of the angle theta ₁ is less, is engaged with the inner peripheral surface of the tubular portion 10 becomes L <L1 cosθ _1. That is, according to the present embodiment, θ ₁ = θ ₂
Even in the case of (1), since the inner burr 32 can be securely locked to the inner peripheral surface of the tubular portion 10, the outer burr 31 and the inner burr 32 can be reliably removed from the work 3, and The annular portion 30 separated from the burrs 31 and the inner burrs 32 can be stably transported to the next step.

(Comparative Example) In this comparative example, θ ₁ = θ ₂ =
It is the same as Example 1 except that it is 0. That is, in this comparative example, the annular portion 30
As shown in FIG. 5, the inner burr 32 separates from the cylindrical portion 10 while moving on the surface of the pressing surface 24, but since L> L ₁ = L ₂ , the cylindrical portion 10 There is a clearance between the inner peripheral surface of the inner burr 32 and the peripheral edge of the inner burr 32, and it becomes difficult for the inner burr 32 to be locked to the cylindrical portion 10. Therefore, when the centering punch 20 is lowered, the inner burr 32 is also lowered at the same time, and a step of manually removing the same is required.

Even if the inner burr 32 is locked in the cylindrical portion 10, the locking strength is small, and therefore, the inner burr 32 may fall during the movement of the upper mold 1, and in such a case, the hand may be disturbed. Work is required. Therefore, in this comparative example, since the production line must be stopped or manual work is required, the productivity is low.

[0035]

According to the deburring method of the present invention, since the annular portion is held by the lower mold, it does not fall, and the separated inner burr is securely locked and held by the upper mold. Fall is reliably prevented. Therefore, the transfer of the annular portion to the next process can be reliably performed, and there is no need to stop the production line due to a drop or manual work, thereby significantly improving productivity.

Further, the deburring step can be performed on the same line as the other steps, and the inner burr and the outer burr can be discharged simultaneously, so that the number of steps can be reduced and the man-hour can be greatly reduced. The number of facilities required is reduced, which is extremely effective in terms of facilities and space.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a deburring apparatus used in one embodiment of the present invention before deburring.

FIG. 2 is a cross-sectional view showing the deburring apparatus used in the embodiment of the present invention in a state where the deburring is being performed.

FIG. 3 is a cross-sectional view showing a deburring apparatus used in a second embodiment of the present invention in a state where deburring is being performed.

FIG. 4 is a cross-sectional view illustrating a deburring apparatus used in a second embodiment of the present invention in a state where deburring is being performed.

FIG. 5 is a cross-sectional view showing the deburring apparatus used in the comparative example in a state during deburring.

[Explanation of symbols]

1: Upper mold 2: Lower mold
3: Work 10: Tubular part 20: Core punch
24: pressing surface 30: annular portion 31: outer burr
32: Inner burr

Claims (2)

[Claims] 1. A work having an annular portion is sandwiched between an upper mold and a lower mold, and an inner burr formed on an inner peripheral surface of the annular portion is pressed into the upper mold by a core punch to remove the work from the work. a burr bleeding removing the inner burrs, the angle theta ₁ oblique angle theta ₁ is less than the angle theta ₂ of the inner burrs with respect to the horizontal plane _{(θ 1> θ 2 ≧ 0} ) inclined pressing surface to the horizontal plane core the inner burr were separated and the annular portion is pressed by the punching punch, smaller angle than the angle theta ₁ inner burr is brought into contact with the pressing surfaces in a state where the inner burr is positioned within the upper mold having A deburring method, wherein the inner burr is locked to the inner peripheral surface of the upper die by being inclined with respect to a horizontal plane. 2. A work having an annular portion is sandwiched between an upper mold and a lower mold, and an inner burr formed on an inner peripheral surface of the annular portion is pressed into the upper mold by a core punch to remove the work from the work. a burr bleeding removing the inner burrs, and presses the inner burr angle theta ₁ inclined relative to a horizontal plane by the pressing surface of the core punching punch separating the annular portion and the inner burr,
Horizontal plane inner burrs by pressing the inner burr is projected a pressing pin provided in the core vent punch from pressing pressure surface angle theta ₁ at smaller angles in a state where the inner burr is positioned within the upper mold A deburring method, wherein the inner burr is locked to the inner peripheral surface of the upper die by being inclined with respect to the upper die.