JPH089121B2 - Processing method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing a cylindrical product, and more particularly, to a processing method capable of finishing the surface of a thin product evenly.

Conventional technology As represented by the drums used in copying machines,
In recent years, it has been a particular problem how quickly and reliably a cylindrical object that requires smoothness can be produced.

Depending on the required smoothness, turning, rotary grinding, honing, etc. are performed.Especially when turning thin material of light alloy such as aluminum, the work piece and the bite resonate. In some cases, so-called chattering occurs and the processed surface is roughened.

Conventionally, in order to prevent this resonance, the cutting speed is adjusted, or a mandrel covered with rubber is fitted and processed.

The problem to be solved by the invention is that it is inefficient to adjust the cutting speed, and even when the core coated with rubber is fitted and processed, the rubber causes repulsion elasticity, so sometimes I couldn't expect the anti-vibration effect that resonated and made me feel secure.

MEANS FOR SOLVING THE PROBLEMS The present invention is a method in which a gel-like substance layer is inserted into a workpiece, the gel-like substance layer is deformed, and the gel-like substance layer is brought into contact with the inner peripheral wall of the workpiece. Characterized in that
It is intended to prevent the occurrence of chattering and to finish the machined surface of the cylindrical object to be smooth.

Effect The processing method of the present invention, by processing the gel material layer in contact with the inner peripheral wall of the workpiece, to propagate the vibration between the tool and the workpiece to the gel material layer, In the material layer, this vibration rapidly propagates to its own wide area and is absorbed in the entire gel material layer, thereby eliminating the cause of lowering the surface smoothness.

That is, the inelastic deformation of the gel material is characterized in that it does not generate repulsive force, and the vibration wave applied to the gel material is
While deforming the gel-like substance, it is rapidly dispersed and differentiated, and during that time it is converted into heat and the like, and is absorbed in a wide area within the gel-like substance layer.

In addition, the gel-like substance can be greatly deformed with a small force, and the repulsion is small, so by applying a force such as a pressing force or a centrifugal force to the gel-like substance layer, the inner peripheral wall of the workpiece Can be brought into contact with an appropriate contact force.

Example Next, an example of the processing method of the present invention will be described, but before that, a cored bar suitable for this will be described with reference to the illustrated one.

FIG. 1 shows that a gel-like substance layer inserted into a work is pressed in the axial direction to bulge and deform the gel-like substance layer, and the gel-like substance layer is applied to the inner peripheral wall of the work. A mandrel suitable for contacting, the mandrel 11 being a gel and a pressing piece 14 on a mandrel shaft 16 between a base piece 12 and an end piece 13 in an inner peripheral space of a workpiece. A large number of material layers 15 are alternately arranged.

The base piece 12 has a circular shape having an outer diameter substantially the same as the inner diameter of the workpiece, and a rod-shaped mandrel shaft 16 having a length substantially equal to that of the workpiece is fixed to the center thereof. The other end of the mandrel shaft 16 is processed into a spline shaft shape, and the spline shaft-shaped portion 161
In, the end piece 13 is supported by meshing. Therefore, the end piece
A spline groove 131 is engraved in 13 and a center hole 132 is formed in the center of the outer end surface, and a peripheral surface 133 is formed.
Is formed in a large-diameter tapered shape on the side of the center hole 132.

Further, the pressing piece 14 and the gel-like material layer 15 are each formed in a cylindrical shape having a diameter slightly smaller than the inner diameter of the work piece, and the total width in its natural state is the end piece 13 of the work piece. It is slightly longer than the distance between the base piece 12 and the end piece 13 when set by pressing against the end surface. Further, a hole having a diameter slightly larger than the shaft diameter of the mandrel shaft 16 is bored in the center thereof, and the pressing piece 14 and the gel-like substance layer 15 are formed on the mandrel shaft 16 like an abacus ball by this hole. , And they pass through alternately. Therefore, if the end pieces 13 are capped and pressed against each other, the pressing pieces 14 and the gel-like substance layer 15 move on the mandrel shaft 16 by that amount, and the gel-like substance layer 15 is pushed and pushed by the pushing piece 14. Are deformed so as to bulge in the diameter direction.

As a gel material, silicone gel is well suited because of its stability as a material, and JIS K 2530-1976- (50 g
The silicone gel with a penetration of about 50 to 200 as measured by the load) and the composite silicone gel obtained by mixing micro hollow spheres into it have excellent damping and vibration-proofing ability. The use of gel is recommended. Examples of such materials include Toray Silicone CF5027
(Manufactured by Torre Silicone Co., Ltd.), KE-1051 (manufactured by Shin-Etsu Chemical Co., Ltd.), and as hollow microspheres, Philite (trade name: manufactured by Nippon Philite Co., Ltd.) and Expancel (trade name: sold by Nippon Philite Co., Ltd.) is there.
The gel-like substance layer 15 is enclosed in a thin covering material because the gel-like substance has strong adhesiveness. In this way, in order to enclose in the covering material, for example, as shown in FIG. 6, a check valve 71 in which a notch 73 is formed in a flat circular thick wall portion 72 formed inside the case with a thin silicone rubber or the like. A hollow cylindrical case 7 with a
From 71, the gelled material undiluted solution is injected while venting air, and then heated to gel. Of course,
Even if the check valve 71 is not provided, the injection may be performed by puncturing with a syringe or the like.

Further, the base piece 12, the end piece 13, the mandrel shaft 16 and the like are preferably made of a metal material for strength, but the pressing piece 14 may be a molded body of synthetic resin or the like, not a simple cylindrical shape. Alternatively, the gel-like substance layer 15 may be formed in a different shape so that the pressing force on the outer periphery of the gel-like substance layer 15 increases. As described above, if the pressing piece is made of synthetic resin, the weight can be reduced, and therefore the risk of eccentric rotation of the core itself can be reduced. Further, the number and arrangement of the gel-like substance layers may be appropriately selected according to processing conditions and the like, and further, the outer peripheral surfaces of the base piece 12 and the end piece 13 are preferably covered with hard rubber or the like.

Next, one embodiment of the processing method of the present invention will be described by using the above-described mandrel 11.

Therefore, this mandrel 11 is fitted into a cylindrical work A, and bridged between the chuck and tailstock of a processing machine such as a lathe or a grinder to convey the rotation of the spindle to the work, A tool such as a whetstone or a grindstone is pressed against a work piece for processing.First, the end piece 13 is removed, and the pressing piece 14 and the gel-like substance are attached from the sprocket shaft-shaped portion 161 side of the mandrel shaft 16. A group of layers 15 is inserted into the inner peripheral space of the work A, and the base piece 12 is fitted into the inner peripheral wall. At this time, although it is difficult to fit in the portion of the base piece 12 to be finally inserted, since the pressing piece 14 and the gel-like substance layer 15 in the natural state are smaller than the inner diameter of the work piece, the inner peripheral space of the work piece Can be easily put in. Finally, the end piece 13 is attached to the sprocket shaft-like portion 161 of the mandrel shaft 16.
, The base end of the work piece A is grasped by the chuck B so as to sandwich the base piece 12, and the tailstock C is pressed against the end piece 13 from the opposite side. At this time, the pressure from the tailstock causes the other end of the work piece to be pressed by the tapered wall surface 133 of the end piece 13 to fix the center, and
In the inner peripheral space of the workpiece, the force acts to press the laminated gel-like substance layer 15 in the axial direction from the inner end surface of the end piece 13.
Then, due to this pressing force, the gel-like substance layer 15 is deformed as if it was crushed, but since it is restricted in the axial direction, it is deformed in the momentum diameter direction. As a result, the outer peripheral portion of the gel material layer 15 comes into contact with the inner peripheral wall of the workpiece.

Therefore, in this state, if the spindle is rotated and each tool is pressed against it, the vibration generated in the system of the workpiece and the tool during machining is transmitted to the gel-like material layer 15.

In the gel-like substance layer 15, this vibration is rapidly propagated in a wide area as its own inelastic deformation, but the inelastic deformation of the gel-like substance is characterized in that it does not generate repulsive force, and is applied to the gel-like substance. The generated vibration waves are rapidly dispersed and differentiated while deforming the gel-like substance, converted into heat and the like, and thus absorbed in a wide range within the gel-like substance.

As a result, vibration such as resonance is suppressed and the surface is finished to be smooth.

Then, when the processing is completed, the chuck B is loosened, the tailstock C is pulled back, and the workpiece A is removed from the processing machine, the gel-like substance layer 15 returns to its original diameter, and the whole mandrel 11 is processed A.
The work can be completed by easily pulling it out from the inner space.

It should be noted that the inelastic deformation referred to in the present specification means that strong elastic deformation such as rubber and spring is not performed, and does not mean that elastic deformation is not performed at all. Similarly, the absence of repulsion means that it does not exhibit strong repulsion elasticity like rubber and spring, and does not mean that the repulsion elasticity is absolutely zero.

2 to 5 are cross-sectional views of other examples of cores for carrying out the method of the present invention, in which the gel-like material layer was deformed by compressive pressing force. However, the mandrel 21 shown in FIG. 2 is intended to deform the gel-like material layer by the force acting on the wedge. That is, the peripheral surface of the pressing piece 24 is formed in a taper shape, and the gel-like material layer 25 is also formed into a taper-like receiving shape so as to match this, and the gel-like material layer 25 is spread by the force of spreading from the taper wall surface. Is deformed so as to be brought into contact with the inner peripheral surface of the workpiece.

Further, the mandrel 31 shown in FIG. 3 tries to deform the gel-like substance layer in the diametrical direction by the centrifugal force due to the high-speed rotation of the gel-like substance layer and bring it into contact with the inner peripheral wall of the workpiece. The disk-shaped bridge 8 is fixed in front of the sprocket shaft of the mandrel shaft 36, and the thin cylindrical gel-like material layer 35 is bridged between the base 32 and the bridge 8. It is a thing. The gel-like material layer 35 is a double cylindrical synthetic resin film bag 35.
The inside of the space is filled with a gel material, and both ends of the synthetic resin film bag are overlapped and hooked on the base piece 32 and the installation piece 8.

In this case, unlike the case of using the mandrel shown in FIGS. 1 and 2, after fitting into the inner peripheral space of the workpiece A,
By rotating the gel-like substance layer 35, a centrifugal force is applied to the gel-like substance layer 35 so that the gel-like substance layer 35 is deformed in the diametrical direction and is brought into contact with the inner peripheral wall of the workpiece. Even in this case, the vibration generated between the workpiece and the tool is transmitted to the gel-like substance layer 35, where it is converted into heat or the like and absorbed.

Further, the mandrel 41 shown in FIG. 4 is also intended to be deformed in the diametrical direction by the centrifugal force due to the high speed rotation of the gel-like material layer, and the pressing piece 14 of the mandrel 11 in FIG. The material layer is like being fixed at an appropriate position, but in this case, the outer shape of the gel material layer 45 is the inner peripheral wall of the workpiece when the gel material layer 45 is deformed by centrifugal force. Although abutting, when the centrifugal force does not act, it is necessary to make the diameter easy to put in and take out from the inner peripheral space of the workpiece.

In addition, a mandrel 51 shown in FIG. 5 is a cylindrical or cylindrical mandrel core body 511 with a gel-like substance layer 55 attached around the mandrel 51. The mandrel 51 is cooled or the workpiece is heated. Thus, a gap is created between the inner and outer diameters of the two, and the gel substance layer 55 is deformed by expansion or contraction caused by returning to room temperature by fitting it while the gap is present. It is intended to make contact with the inner peripheral surface of the. Therefore, it is used when processing an object having a large coefficient of thermal expansion, or the core metal core 511
Select a material with a large heat shrinkage rate for the
It is desirable to make a notch 57 in 55, or to stick a gel-like material layer in a water wheel blade shape.

As described above, the processing method of the present invention has been described as one using some illustrated cores, but the processing method of the present invention does not necessarily have to use any of these cores, and for example, Besides pressing in the axial direction or centrifugal force, thermal deformation force, etc. of the gel-like material layer during high speed rotation,
What kind of mandrel is suitable for working by deforming the gel-like substance layer in the diametrical direction by applying some force, bringing the gel-like substance layer into contact with the inner peripheral wall of the workpiece, and processing during this period? It is also possible to use different core money. Further, the structure of both ends of the mandrel that fits with the work piece is not limited to the one described above, and the point is that the gel material layer can be stably supported in the inner peripheral space of the work piece, and the work piece is stable. Needless to say, it may have a structure that can be supported between the chuck and the tailstock. Furthermore, in the above-mentioned examples, the gel-like material layer was coated with a gel-like material such as a silicone rubber case or a synthetic resin film bag. A semi-rigid thin film layer may be formed at a higher temperature, and in some cases, the gel substance may be used as it is, except for the problem of tackiness. In short, it is desirable to use a coating material that does not impair the properties of the gelled substance even when it is coated.

EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to eliminate the cause of lowering the surface smoothness by absorbing the vibration between the workpiece and the tool, and to provide the cylindrical object requiring the smoothness. It can be manufactured quickly and reliably.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a mandrel used in the processing method of the present invention in a state of being held by a chuck, and FIG. 2 is another mandrel used in the processing method of the present invention pressed by a tailstock. Fig. 3 is a transverse sectional view showing another mandrel, Fig. 5 is a longitudinal sectional view showing the same, and Fig. 6 is a perspective view of an example of a pressing piece used for the mandrel. is there. A: Work piece, 11, 21, 31, 41, 51 ...... Mandrel 15, 25, 35, 45, 55 …… Gel material layer

Claims (3)

[Claims] 1. A method for processing a peripheral surface of a rotating cylindrical workpiece by pressing a tool onto the peripheral surface of the workpiece, wherein a gel material layer is inserted into the workpiece, and after the gel material is inserted, the gel material layer is inserted. The material layer is deformed and brought into contact with the inner peripheral wall of the workpiece, and the outer peripheral surface is processed while the gel-like material layer is in contact with the inner peripheral wall of the workpiece. Processing method. 2. A gel-like substance layer inserted into a workpiece is axially pressed to bulge and deform the gel-like substance layer in a diametrical direction to form a gel-like substance layer on the inner peripheral wall of the workpiece. The processing method according to claim 1, wherein the processing method is abutting. 3. A gel-like substance layer inserted into a workpiece is deformed in a diametrical direction by centrifugal force due to high-speed rotation, and the gel-like substance layer is brought into contact with the inner peripheral wall of the workpiece. The processing method according to claim 1, wherein the processing method is performed.