JPH07285074A - Deburring method of working hole in tubular member - Google Patents

Abstract

PURPOSE:To deburr a working hole effectively by jetting a projection material into a hollow part of a tubular member, as blocking up a tip opening of this tubular member with a blocking member, from one end opening through an air blast nozzle and then exhausting it to the outside from the working hole. CONSTITUTION:When projecting materials are jetted into a hollow part 8 of a tubular member 3 together with compressed air from an air blast nozzle 10 adjoining its tip to one end opening 12 of this tubular member 3, these projecting materials diffusedly progresses in the hollow part 8 as shown in an arrow in consequence. At this time, a tip opening 11 of the tubular member 3 is closed by a blocking member 14. In consequence, a projecting material flow is centralizingly heading for a working hole 5 being opened, whereby burr 9 around a hole edge of the working hole 5 is removed. Simultaneously with this, along with this burr 9, this projecting material flow is exhaust and scattered to the outside passing through the working hole 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deburring method for a machined hole in a tubular member, by which a machined hole is formed in the peripheral wall of the tubular member so that burrs formed on the inner surface of the tubular member can be removed easily and accurately. Is.

[0002]

2. Description of the Related Art In general, a peripheral wall portion of a cylindrical member such as a hollow shaft used in a machine tool or various vehicles is often formed with a drilled hole. When formed, burrs are formed so as to project at the hole edges of the processed holes on the inner surface of the tubular member. As a method for removing such burrs, there is an air jet machining method using an air blast nozzle.

FIG. 4 and FIG. 4 show a case where a deburring process is performed on a cylindrical member in which three machining holes are sequentially arranged in the front peripheral wall portion of the cylindrical member in the axial direction in this pneumatic injection machining method. This will be described with reference to 5. First, in FIG. 4, which is an explanatory view of the first conventional processing method, a holder 2 is attached to a support frame 1 installed in a projection chamber (not shown) having a closed structure, and a cylindrical member which is a work is attached to the holder 2. Hold 3 Machining holes 5, 6 and 7 are sequentially arranged in the front peripheral wall portion 4 of the tubular member 3 at a predetermined interval in the axial direction of the tubular member 3, and a hollow portion 8 of the tubular member 3 is formed.
Burrs 9 are formed on the edges of the machined holes 5, 6, and 7 facing the
Are formed to project. Further, in the projection chamber, a nozzle tip is made to face one end opening of the tubular member 3 and a projection material made of abrasive grains such as shots and grit is injected into the hollow member 8 together with compressed air into the tubular member 3. Air Blast Nozzle 1
0 is provided. Air blast nozzle 1 in this state
When the shot material is jetted from 0, the flow of the shot material diffuses in the hollow portion 8 and progresses to the burr 9 of each of the processing holes 5, 6, and 7.
While ejecting, ejecting from the tip opening 11 of the tubular member 3,
A part of them passes through the processed holes 5, 6, and 7 and is discharged to the outside.

On the other hand, in FIG. 5, which is an explanatory view of the second conventional processing method, the body portion of the air blast nozzle 10 is an elongated tubular shape, and the nozzle tip thereof is a bent portion for deflecting the projection direction laterally. It is of a horizontal hole nozzle type formed in 13 and is inserted into the projection chamber so as to be movable back and forth. And
At the time of processing, the air blast nozzle 10 is inserted into the hollow portion 8 of the tubular member 3, and the opening end of the bent portion 13 is first opposed to the first processing hole 5 to eject the shot material. Burr 9 is removed and jetted to the outside together with the shot material flow, and a part of the shot material flow is discharged from the tip opening 11. Therefore, if deburring of the first processed hole 5 is completed in this manner, The blast nozzle 10 is advanced so that the tip of the nozzle faces the next processing hole 6 and the projection material is ejected in the same manner.
After that, similarly, the next processed hole 7 is deburred.

[0005]

However, in the case of the first conventional processing method described with reference to FIG. 4, the cylindrical member 3 is used.
Most of the shot material injected and introduced into the hollow portion 8 of the hollow portion 8 travels at high speed in the central portion of the hollow portion 8 and is jetted from the tip opening 11 as shown by the arrow. The blast material flow along it is small and each burr 9 is not sufficiently removed. Further, in the case of the first conventional processing method described with reference to FIG.
The air blast nozzle 10 is a special long nozzle that easily clogs the shot material, and since it has a bent portion 13, it has a large pressure loss and inferior polishing ability. Moreover, the worn portion of the bent portion 13 is large and the life is short, and machining is possible. Depending on the position of the hole, the air blast nozzle 10 itself must be rotated, which poses a problem that the overall cost is high.

The present invention solves the problems of the conventional processing method as described above, and the projection material flow is intensively introduced into the processing hole and is discharged to the outside so that the projection material flow is formed by the processing hole. An object of the present invention is to provide a method for deburring a machined hole in a tubular member, which is capable of effectively removing the tubular member burr.

[0007]

A method for deburring a machined hole in a tubular member according to the present invention, which has been completed to achieve the above object, is a tip opening of a tubular member having a machined hole in a peripheral wall portion. While blocking by the blocking member, the projection material is jetted and introduced from the one end opening into the hollow portion of the cylindrical member by the air blast nozzle and then discharged from the processing hole to the outside. In the case where the peripheral wall portion is provided with a plurality of processed holes, the control member is slid along the outer periphery of the cylindrical member having the peripheral wall portion provided with the plurality of processed holes to sequentially open the processed holes. However, the deburring process can be performed quickly and easily by ejecting the shot material from the air blast nozzle.

[0008]

In such a method of deburring a machined hole in a tubular member, when the blast material is injected and introduced from the air blast nozzle into the tubular member, the blast material diffuses in the tubular member and partially By the blocking member, it stays at the tip as accumulated shot material, and the others concentrate and flow into the open processing hole,
Since the burr is ejected to the outside while being removed, the burr can be removed easily and accurately. Further, since the processing holes can be sequentially opened by sequentially moving the control member on the outer periphery of the tubular member, deburring can be performed more easily and efficiently.

[0009]

EXAMPLES Examples of the present invention will now be described with reference to the deburring apparatus shown in FIGS. 1 and 2
In the above, the holder 2 attached to the support frame 1 installed in a projection chamber (not shown) having a closed structure is configured to be able to hold the tubular member 3. The cylindrical member 3 has processing holes 5, 6 and 7 sequentially arranged at predetermined intervals in the axial direction from the one end opening 12 side to the tip opening 11 side in the peripheral wall portion 4 at the front side thereof. A burr 9 is formed so as to project from the hole edge of each of the processed holes 5, 6 and 7 facing the hollow portion 8. Further, in the projection chamber, a nozzle tip is made to face the one end opening 12 of the tubular member 3, and a projection material made of abrasive grains such as shots and grit is jetted into the hollow member 8 together with compressed air in the tubular member 3. The provision of the air blast nozzle 10 for introduction is the same as that used in the first conventional processing method shown in FIG. A blocking member 14 that obstructs the ejection of the projection material injected into the tubular member 3 is removably positioned at the tip end opening 11 of the tubular member 3, and the outer periphery of the tubular member 3 is removed. The machined holes 5, 6,
A tubular control member 15 that can open and close 7 is slidably and detachably fitted. Reference numeral 16 is a staying shot material accumulated near the tip opening 11 of the hollow portion 8 closed by the blocking member 14, and 17 is a hose for feeding the shot material.

In such a structure, in order to remove the burrs from the processed holes, first, the tubular member 3 is inserted and fixed in the holder 2, and the control member 15 is fitted in the peripheral wall portion 4 to the air blast nozzle 10 side. Open only the near processing hole 5, and
A blocking member 14 is located in the tip opening 11. Then
When the blast material is jetted together with the compressed air into the hollow portion 8 of the tubular member 3 from the air blast nozzle 10 having the tip facing the one end opening 12 of the tubular member 3, these blast materials are hollow portions as indicated by arrows. However, since the tip end opening 11 of the tubular member 3 is closed by the blocking member 14, the blast material flow is concentrated toward the open processing hole 5 and the processing is performed. The burr 9 on the edge of the hole 5 is removed, and the burr 9 is discharged and scattered to the outside through the processed hole 5 together with the burr 9. It should be noted that a part of the shot material injected and injected goes straight and collides with the blocking member 14, stalls, and accumulates near the tip end portion 11 to form the staying shot material 16.

When the deburring of the first processed hole 5 is completed, the control member 15 is slid to open the next processed hole 6 as shown in FIG. The burr 9 is intensively flown toward the processed hole 6, the burr 9 is removed, and the burr 9 is discharged and scattered to the outside together with the flow of the shot material. In this case, when the machining hole 6 is opened, the staying shot material 16 near the machining hole 6 is ejected to the outside through the machining hole 6 along with the flow of the projection material that is injected and introduced, so that deburring is not hindered. Moreover, the blasting material flow is less likely to be ejected to the outside from the machining hole 5 that has been deburred and is in an open state, and most of it is concentrated on the machining hole 6 side and does not affect the deburring effect. Next, when the deburring of the machined hole 6 is completed, if the control member 15 is removed to open the machined hole 7, the burr 9 of the machined hole 7 is removed in the same manner as described above. Removes the blocking member 14 from the tubular member 3 and pulls it out from the holder 2,
Carry out to the next process.

Next, FIG. 3 is an explanatory view of another embodiment of the method of the present invention, in which the hollow portion 8 of the cylindrical member 3 inserted and fixed in the holder 2 is shown.
The rod-shaped control blocking member 18 is inserted into the inside from the side of the tip opening 11 and the control blocking member 18 is positioned so as to open only the processing hole 5 closest to the opening 12 at one end, and then the air blast nozzle 10 projects When the material is jetted into the hollow portion 8 of the tubular member 3, the burr 9 of the processing hole 5 is removed in the same manner as described above, and in this case, the retention projection material 16 similar to the above is slightly present on the end surface portion of the control inhibiting member 18. It is formed. After the deburring of the machined holes 5 is completed in this manner, the control blocking member 18 is retracted to open the machined holes 6 and 7 in order to carry out all the deburring. There is almost no difference from the case described with reference to 2. It is a thing.

Now, using the deburring apparatus as described above, deburring of an iron rocker shaft having five holes with an inner diameter of 10 mmφ, a length of 790 mm and a diameter of 5 mmφ is performed, and an air blast nozzle with a nozzle diameter of 5 mmφ is used. Use particle size (0.3mm
When φ) steel shot was injected and introduced at an air pressure of 0.5 MPa, it was confirmed that all burrs could be removed in a total projection time of 30 seconds. According to various experimental results, the air blast nozzle diameter is generally 4 to 8 mm.
φ, grain size of shot material (steel shot) is 40 ~ 1000μm
It was found that a proper air pressure of 0.3 to 0.6 MPa was suitable. Further, it is preferable that the tubular member 3 be held horizontally or obliquely downward or downward, and when the air blast nozzle 10 is exposed to the one end opening 12 of the tubular member 3, there is a slight gap between the two. There is no problem even if there is a gap, and instead of using the control member 15, tapes such as gum tape may be wound around the peripheral wall portion 4 to sequentially close the processing holes. Further, in the above description, a plurality of processed holes are arranged in the peripheral wall portion 4 in a straight line in the axial direction,
Such an arrangement is only a typical example, and the number of processed holes is 1
It is needless to say that the present invention can be applied to the case of individual pieces and also to the case where a plurality of processed holes are formed in another arrangement.

[0014]

As is apparent from the above description, even if the air blast nozzle used according to the present invention is an inexpensive and easy-to-use ordinary one, the shot material flow is intended for deburring. The deburring process is effectively performed by concentrating only on the drilled holes, and the jetting of the shot material is slight, economical, and is not excessively processed to increase the hole diameter. Moreover,
A part of the shot material is obstructed by the blocking member and remains as a staying shot material on the inner side of the tubular member to smooth the flow of the shot material to the required processing hole and also as a cushioning material against the collision of the shot material. As a result, damage to the blocking member can be prevented, and the automation can be facilitated with a simple structure to improve productivity. Further, when the control member is used, the deburring work can be more easily and speedily performed by simply sequentially opening the processing holes from the opening side by the control member. Therefore, the present invention is extremely large in that it contributes to the development of the industry by solving the problems of the conventional method of deburring a machined hole in a tubular member.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view for explaining an example of an implementation state of a method of the present invention.

FIG. 2 is a partially cutaway front view showing a different aspect.

FIG. 3 is a partially cutaway front view for explaining another embodiment of the implementation state of the method of the present invention.

FIG. 4 is a partially cutaway front view illustrating an implementation state of a first conventional processing method.

FIG. 5 is a partially cutaway front view illustrating an implementation state of a second conventional processing method.

[Explanation of symbols]

 3 Cylindrical member 4 Peripheral wall 5 Machining hole 6 Machining hole 7 Machining hole 9 Burr 10 Air blast nozzle 11 Tip opening 12 One end opening 14 Blocking member 15 Control member

Claims (2)

[Claims] 1. A machining hole in which a projection member is jetted from an opening at one end into an hollow portion of the cylindrical member by an air blast nozzle while closing a front end opening of the cylindrical member having a machining hole formed in a peripheral wall portion by a blocking member. A method for deburring a machined hole in a tubular member, characterized in that the deburring is performed to the outside. 2. A projection member is jetted from an air blast nozzle while sliding a control member along the outer periphery of a cylindrical member having a plurality of processing holes formed in a peripheral wall portion to sequentially open the processing holes. 1. A method for deburring a machined hole in a tubular member according to 1.