JP2003286836A - Manufacturing method of pillar holding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust the inside diameter of a part for holding at least a cushioning member of a cylindrical member appropriately, and hold appropriately by press-inserting a pillar wounded with the cushioning member into the cylindrical member. <P>SOLUTION: The cushioning member is compressed by pressing the cushioning member in the direction perpendicular to the axis of the pillar by a pressing body 9 in a state of winding the cushioning member (cushion mat 3) at the outer periphery of the pillar (catalyst carrier 2), the surface pressure of the cushioning member against the pillar is detected, and the predetermined distance between the axis of the pillar and the end of the pressing body is measured when the surface pressure reaches a predetermined value. The pillar wounded with the cushioning member is press-inserted into the cylindrical member of which the diameter is previously contradicted or expanded so that the actual diameter of the inside of the part holding at least the cushioning member becomes the predetermined distance. <P>COPYRIGHT: (C)2004,JPO

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 a columnar body holding device for retaining a columnar body in a tubular member via a cushioning member. The present invention relates to a manufacturing method suitable for manufacturing a catalytic converter that holds a catalyst carrier.

[0002]

2. Description of the Related Art A column body holding device for holding a columnar body having a honeycomb structure having a filter function for fluids in a tubular member made of metal via a cushioning member is used as a fluid treatment device. It is used for purification. For example, a catalytic converter or a diesel particulate filter (hereinafter referred to as DPF) is installed in an exhaust system of an automobile, and a catalyst carrier, a filter, or the like (collectively referred to as a carrier, and hereinafter, referred to as a catalyst carrier is representative of these. As a result, a fragile honeycomb structure made of ceramic is used. The columnar body having the honeycomb structure is held in a metallic cylindrical member through a cushioning member such as a ceramic mat to constitute a fluid treatment device. An example thereof is a catalytic converter. As a method of manufacturing a columnar holding device such as this catalytic converter, a manufacturing method is generally used in which a buffer member is wound around the outer periphery of a catalyst carrier, and the buffer member is compressed and accommodated in a cylindrical member. Is.

For example, the following Patent Document 1 (Japanese Patent Laid-Open No. 2001-2001)
-355438), the outer diameter of the catalyst carrier is measured when press-fitting the catalyst carrier having the holding material mounted on the outer periphery into the holding cylinder, and the holding material is mounted on the holding cylinder having an inner diameter conforming to the measured value. There has been proposed a method of manufacturing a catalytic converter in which the catalyst carrier is press-fitted. A method has also been proposed in which the outer diameter of a holding material mounted on the outer periphery of a catalyst carrier is measured, and the catalyst carrier with the holding material is press-fitted into a holding cylinder having an inner diameter that matches the measured value. Further, it has been proposed to measure the outer diameter of the holding material while applying a predetermined pressure. Then, in Patent Document 1, it is proposed that materials of a large number of holding cylinders having different inner diameters are prepared in advance and a material having an appropriate inner diameter is selected from them.

Incidentally, the following Patent Document 2 cited as a conventional technique in Patent Document 1 discloses a diameter reducing process by spinning. Further, as necking processing for the end portion of the tubular member after press fitting, eccentric spinning processing is disclosed in Patent Document 3 below, and inclined spinning processing is disclosed in Patent Document 4 below.

[0005]

[Patent Document 1] Japanese Patent Laid-Open No. 2001-355438

[Patent Document 2] Japanese Patent Laid-Open No. 2000-45762

[Patent Document 3] Japanese Patent No. 2957153

[Patent Document 4] Japanese Patent No. 2957154

[0006]

[Patent Document 1] Japanese Patent Application Laid-Open No. 2003-187242 discloses that when a catalyst carrier 2 is press-fitted into a holding cylinder 1, a holding material 3 is used.
It is desirable to measure the outer diameter of the holding material 3 in a state where a pressure equivalent to the pressure applied to the holding material (hereinafter referred to as holding pressure) is applied to the holding material 3. " In, it is impossible to estimate the pressure applied to the holding material in the subsequent step, and no explanation is found on this point. That is, the description that the pressure equal to the pressure applied to the holding material 3 when the catalyst carrier 2 is press-fitted into the holding cylinder 1 is applied to the holding material 3 does not depart from the desired range. I can't find any disclosure that could be considered feasible.

Further, in the above-mentioned patent document 1, "holding cylinder 1
As the material of the above, a material having an inner diameter such that an appropriate pressure can be applied to the catalyst carrier 2 on the holding material 3 after press fitting is used. This can be achieved by preparing in advance a large number of materials having different inner diameters and selecting one having an appropriate inner diameter from among them. '' As a result of measuring the outer diameter of the holding material 3 in a state where a pressure equivalent to the pressure applied to the holding material 3 is applied to the holding material 3 (this is impossible as described above, but temporarily possible). Accordingly, it is obvious that the inner diameter of the holding cylinder 1 is not adjusted.
After all, it is not clear how the pressure is applied to measure the outer diameter of the holding material 3 and what measurement result is used and how.

On the other hand, in the conventional press-fitting manufacturing method, the outer diameter of the catalyst carrier and the inner diameter of the tubular member are generally based on the packing density (called GBD value) of the cushioning mat as the cushioning member. The gap is set. This GBD value is
It is the weight per unit area / filling gap size, and a surface pressure (unit: Pascal) is generated according to the packing density of the buffer mat, and this surface pressure holds the catalyst carrier. In addition to adjusting the strength of the catalyst carrier so that it does not exceed the strength of the catalyst carrier, the catalyst carrier to which vibration or exhaust gas pressure is applied must be adjusted to a value that can hold the catalyst carrier so that it does not move in the tubular member. For this purpose, the cushioning member has to be press-fit with a GBD value within the design range and this GBD value must be maintained during the life cycle of the product.

However, in the above-mentioned general press-fitting manufacturing method, an error in the outer diameter of the catalyst carrier, an error in the inner diameter of the cylindrical member, and a buffer member interposed between them are inevitably generated in the manufacturing process. The error of the weight per unit area of the (buffer mat) is superposed and becomes the error of the GBD value. Therefore, this GB
Finding the optimum combination of each member for minimizing the error of the D value cannot be a realistic solution for mass production. Also, the GBD value itself depends on the characteristics and individual differences of the cushioning member, and also depends on the measured value on the plane, and does not represent the measured value in a state in which it is tightly wound around the catalyst carrier. Therefore, GBD
It is desired to press-fit the catalyst carrier properly into the tubular member without depending on the value.

The holding force required to hold the catalyst carrier at a predetermined position in the tubular member will be described below. The holding force in the radial direction of the tubular member is the outer surface of the catalyst carrier and the tubular member. Is the compressive restoring force of the cushioning member that acts in a direction orthogonal to the inner surface of the. On the other hand, for example, with respect to a tubular member fixed to an exhaust system of an automobile, an axial force is generated in the catalyst carrier and the cushioning member due to vibration and exhaust gas pressure. A holding force in the (longitudinal direction) is required, and this is where the frictional force between the cushioning member and the catalyst carrier and the frictional force between the cushioning member and the tubular member contribute.

The frictional force between the cushioning member and the catalyst carrier and the frictional force between the cushioning member and the tubular member respectively change the static friction coefficient between the outer surface of the catalyst carrier and the cushioning member. The product obtained by multiplying the compression restoring force (contact pressure) and the coefficient of static friction between the inner surface of the tubular member and the cushioning member are multiplied by the compression restoring force (contact pressure) of the cushioning member. At this time, the holding force in the axial direction (longitudinal direction) is dominated by the frictional force between the member having the lower static friction coefficient and the cushioning member. Therefore, regarding the catalyst carrier and the tubular member whose static friction coefficient is known, the necessary friction force becomes clear, and in order to secure this, it is necessary to increase the surface pressure on the buffer member,
In order to avoid an excessive radial load when the catalyst carrier is fragile, it is necessary to set the axial holding force to be secured within the limit of the surface pressure on the buffer member.

The surface pressure on the buffer member is set based on the static friction coefficient of the lower one of the static friction coefficient of the outer surface of the catalyst carrier and the static friction coefficient of the inner surface of the tubular member. Accordingly, the inner diameter of at least the buffer member holding portion of the tubular member may be set. That is, when holding the catalyst carrier in the tubular member via the buffer member, the most appropriate control parameter is the surface pressure (unit: Pascal) applied to the catalyst carrier via the buffer member (buffer mat). , The surface pressure is directly detected, or a value uniquely corresponding to this or an approximate value is detected, and based on the detection result,
It is desirable to set the inner diameter of at least the buffer member holding portion of the tubular member to be press-fitted.

However, in the conventional method, the above-mentioned GB is used.
The management based on the D value is general and, so to speak, the estimation management based on the substitute value is performed. Therefore, not only the estimation factor is superposed and the error becomes unavoidable, but as a result, the holding force due to the frictional force between the cushioning member and the catalyst carrier and the friction between the cushioning member and the tubular member are caused. The holding force by force is confused, and the dimensional relationship of each component is set. Also, in the measurement in the above-mentioned Patent Document 1, inevitably, an estimation factor for the subsequent process is superimposed and an error occurs, so it is necessary to take some measures.

Therefore, in the present invention, in the method of manufacturing a column body holding device for holding a column body in a tubular member via a cushioning member, the inside diameter of at least the portion of the tubular member that holds the cushioning member is appropriately adjusted. It is an object of the present invention to press-fit a cylindrical body around which a cushioning member is wound into this cylindrical member so that the cylindrical member can be appropriately held.

[0015]

In order to solve the above-mentioned problems, according to the present invention, as described in claim 1, manufacture of a pillar holding device for holding a pillar in a tubular member via a buffer member. In the method, in a state in which the buffer member is wound around the outer periphery of the columnar body, while pressing the buffering member in a direction orthogonal to the axis of the columnar body by a pressing body to compress the buffering member, Detecting the surface pressure of the buffer member with respect to the column body, measuring a predetermined distance between the axis of the column body and the tip of the pressing body when the surface pressure reaches a predetermined value, and the buffer member The columnar member wound around the buffer member with respect to the tubular member whose diameter is reduced or expanded in advance so that the substantial radius inside at least the portion holding the buffer member is the predetermined distance. It is intended to be press-fitted in a state of being wound around the outer periphery of the pillar. .

In the method for manufacturing the above-mentioned column holding device,
As described in claim 2, the predetermined value is set based on the static friction coefficient of the outer surface of the column body, the static friction coefficient of the inner surface of the tubular member, and the pressing force of the pressing body against the buffer member. It is good to configure as follows.

In the method for manufacturing the above-mentioned column holding device,
As described in claim 3, a plurality of the pressing bodies are arranged side by side over the entire circumference of the cushioning member, and at least one of the plurality of pressing bodies is orthogonal to the axis of the column body. The cushioning member may be pressed in a direction to compress the cushioning member, and the surface pressure of the cushioning member with respect to the column may be detected. Further, as described in claim 4, the plurality of pressing bodies are composed of an elongated member having a length corresponding to at least a portion of the tubular member holding the cushioning member, and the elongated member. It is advisable to arrange the pressing bodies in parallel along the entire circumference of the cushioning member.

In the method of manufacturing the column holding device according to the fourth aspect, as described in the fifth aspect, from the compressed state when the surface pressure reaches a predetermined value to the restoration to the state before the compression. The columnar body formed by winding the cushioning member in the above state may be press-fitted into the tubular member. Accordingly, after the columnar body formed by winding the cushioning member is press-fitted into the tubular member, the cushioning member is completely restored to the initial compressed state, so that the columnar body can be easily press-fitted. Even when the cushioning member is pressed into the tubular member after the cushioning member is restored to the state before the compression, the tubular member has at least a substantial radius inside the portion holding the cushioning member. Since the diameter has been reduced or expanded in advance so that the distance becomes a predetermined distance, it is appropriately press-fitted without being excessively compressed.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a method of manufacturing a columnar body holding device for holding a columnar body in a tubular member via a cushioning member. Explain. First, as shown in FIG. 1, a cushioning mat 3 constituting a cushioning member of the present invention is further wound around the outer periphery of a catalyst carrier 2 constituting a pillar of the present invention, and fixed by a flammable tape or the like as necessary. . Thereby, the integrated product 4 of FIG. 1 is configured. In this case,
It is advisable to use a general winding method in which convex portions and concave portions are formed on both ends of the cushioning mat 3 as shown in FIG. 1 and these are fitted to each other.

In the present embodiment, the catalyst carrier 2 is made of a ceramic honeycomb structure columnar body, but may be made of metal, and the material and manufacturing method are not limited. Cushion mat 3
In the present embodiment, is made of an alumina mat which hardly expands due to heat, but a thermal expansion type vermiculite type buffer mat or a combination of these may be used. Alternatively, an inorganic fiber mat not impregnated with a binder may be used. Since the surface pressure changes depending on the presence or absence of the binder and the content thereof, it is necessary to take this into consideration in the surface pressure setting described later. Alternatively, a wire mesh formed by knitting fine metal wires may be used, or it may be used in combination with a ceramic mat. Further, these may be combined with a metal annular retainer, a wire mesh seal ring, or the like.

Next, as shown in FIG. 2, the above-mentioned integrated product 4
Is clamped between the pair of clamp devices 5, and the catalyst support 2 is pressed by the pressing body 9 of the measuring device DT in the direction orthogonal to the axis Z of the catalyst support 2 via the cushioning mat 3 and applied to the catalyst support 2. The surface pressure applied is detected, and the distance L between the axis Z of the catalyst carrier 2 and the pressing body 9 when the surface pressure reaches a predetermined value is measured. After the measurement, the pressing body 9 is returned to the original position, and then the holding by the clamp device 5 is released.
In this measurement step, it is not necessary to measure the dimensions and characteristic values of the catalyst carrier 2 and the buffer mat 3 themselves. Less than,
The clamp device 5 and the measuring device DT used in this embodiment will be described.

The clamp device 5 is composed of, for example, a collet chuck, by which the upper and lower ends of the catalyst carrier 2 are clamped and the axis Z thereof is set at a predetermined measurement position.
The measuring apparatus DT of the present embodiment includes a ball screw type actuator 10 driven by a motor 11, a pressing body 9 supported at its tip via a load cell 8, and a rotary encoder 12 as a position detecting means arranged at the rear end. I have it. The detection signals of the load cell 8 and the rotary encoder 12 are input to an electronic control unit (hereinafter referred to as a controller) CT, converted into various data described below and stored in a memory (not shown), and the motor 11 is controlled by the controller CT. It is configured to be drive-controlled.

The pressing body 9 moves back and forth in the direction orthogonal to the axis Z of the catalyst carrier 2 (left and right direction in FIG. 2), and the buffer mat 3
It is arranged so that it can be compressed after it comes into contact with. Pressing body 9
Since the contact area of the catalyst carrier 2 is known, the reaction force when the catalyst carrier 2 and the buffer mat 3 to be measured are pressed by the pressing body 9 is detected by the load cell 8 as the surface pressure on the catalyst carrier 2, and the controller CT Entered in.
In the controller CT, the detection signal of the load cell 8 is converted into a surface pressure value, stored in the memory, and compared with a predetermined surface pressure value separately input in advance. Further, the amount of advancement / retraction of the pressing body 9 and the stop position are detected by the rotary encoder 12 as rotation information of a ball screw (not shown) and input to the controller CT. Controller CT
In the above, the detection signal of the rotary encoder 12 is converted into the values of the amount of advance and retreat of the pressing body 9 and the stop position in real time and stored in the memory. The detection means and the controller CT may be electrically or optically connected.

The axis Z of the catalyst carrier 2 is driven by driving the measuring device DT constructed as described above as follows.
The relationship between the distance between the pressing body 9 and the pressing body 9 and the surface pressure applied to the catalyst carrier 2 at that time can be measured. That is,
The pressing body 9 is moved forward from the initial position (moved to the left in FIG. 2) to press a part of the cushioning mat 3, and as shown in FIG.
The compression reaction force of the cushioning mat 3 at the pressing portion is applied to the load cell 8
The position (a position SP at a distance L from the axis Z shown in FIG. 3) when the detection result reaches a predetermined value is detected. This position (position at a distance L from the axis Z) is a cushioning mat of a cylindrical member (after diameter reduction processing) described later when the surface pressure of the cushioning mat 3 after being a product has a predetermined value. 3 Corresponds to the position of the inner wall surface of the holding portion. Therefore, the relationship between the pressing force applied to the catalyst carrier 2 and the reaction force (surface pressure) generated thereby is stored in the memory of the controller CT in advance, and the detection signal (reaction force) of the load cell 8 is based on this relationship. Is converted into a surface pressure value, and the pressing body 9 is advanced to the above position (position of a distance L from the axis Z) while comparing the surface pressure value with a predetermined surface pressure value, and the moving distance of the pressing body 9 is obtained.

Thus, if the moving distance of the pressing body 9 detected by the rotary encoder 12 is subtracted from the predetermined distance between the initial position of the tip of the pressing body 9 and the axis Z of the catalyst carrier 2, the pressing body 9 is deducted. The position of the tip of 9 (that is, the distance L from the axis Z) can be determined, and this position is the product state (that is, the surface pressure on the catalyst carrier 2 in the cylindrical member described later is a predetermined surface pressure). It is the position of the inner wall surface of the buffer mat 3 holding portion (after the diameter reduction processing) of the tubular member in the state of being held at a value. As described above, according to the present embodiment, a position where a predetermined surface pressure value is obtained without individually measuring the dimensions and characteristic values of the catalyst carrier 2 and the buffer mat 3 and using the above-mentioned GBD value (see FIG. The position SP) of the distance L from the axis Z shown in 3 can be determined. That is, the distance L between the axis Z of the catalyst carrier 2 and the tip of the pressing body 9 is
Since, as a result, the value takes into consideration not only the outer diameter error of the catalyst carrier 2 but also the error of the weight per unit area of the buffer mat 3, it is not necessary to separately measure these errors.

The distance L is stored in the memory of the controller CT in preparation for the next step, but it may be displayed if necessary. In addition, the pressing body 9 is not always at a predetermined position (position at a distance L from the axis Z shown in FIG. 3).
It is not necessary to stop at this position, and it is possible to continuously retreat after detecting this position and further to release the grip by the clamp device 5 in synchronization with the retreat of the pressing body 9.

Further, as shown in FIG. 4, a plurality of pressing bodies 9x are arranged radially around the axis Z of the catalyst carrier 2, and a plurality of measuring devices DT including them are used to perform multipoint measurement.
Alternatively, the clamp device 5 and the integrated product 4 are provided around the axis Z.
It may be configured to rotate (index) to perform multipoint measurement, and obtain the average of each measurement value. In particular,
If the catalyst carrier 2 does not have a circular cross section, it is necessary to perform multipoint measurement according to the shape of the catalyst carrier 2, so it is desirable to arrange a plurality of measuring devices DT. It should be noted that the plurality of pressing bodies 9x in FIG. 4 are composed of members that are at least longer than the axial length of the cushioning mat 3, and these pressing bodies 9x are provided.
Are arranged side by side over the entire circumference of the cushioning mat 3 with substantially no gap, but a part of these may be used. Hereinafter, about the embodiment of the measuring device capable of performing multi-point measurement,
This will be described with reference to FIGS. 5 to 11.

FIGS. 5 and 6 show a first embodiment of the multipoint measuring device, in which a so-called scroll chuck 50 and its driving device 60 are mounted on a horizontal base BS. On the scroll chuck 50, chuck claws 51 that can move simultaneously in the radial direction are arranged at three positions at equal angles. These chuck claws 51 are configured to move in the radial direction or the centripetal direction by the same amount according to the rotational drive of the shaft 62 by the motor 61 of the drive device 60. That is, the three chuck claws 51 can be arbitrarily opened and closed or fixed by the drive device 60. An L-shaped holder 70 is placed and fixed on each chuck claw 51, and each measuring device DT is configured. That is, the load cell 80 is fixed to the upper portion of each holder 70, and the elongated pressing body 90 is fixed to the lower portion of each load cell 80.
In order to prevent the backlash of the scroll chuck 50 from rattling each chuck claw 51, each holder 7
Zero is always urged in the centripetal direction or the radial direction by the air cylinder 71 fixed on the base BS.

At the time of measurement, the driving device 60 simultaneously moves the three chuck claws 51 and the holder 70 fixed thereto by the same amount in the centripetal direction, and presses the buffer mat 3 wound around the catalyst carrier 2 against each other. The body 90 abuts at the same time.
When each pressing body 90 further moves in the direction of the catalyst carrier 2, the buffer mat 3 is pressed in the radial direction (from the direction perpendicular to the axis of the catalyst carrier 2). The compression reaction force of the cushioning mat 3 at each pressing portion at this time is detected by each load cell 80 (via each pressing body 90), and the position when the detection result reaches a predetermined value (shown in FIG. 3). The position SP corresponding to the distance L from the axis Z) is detected. Then, the distance between each pressing body 90 and the axial core (of the catalyst carrier 2) when reaching this position is obtained, and the average value thereof is obtained.

In this case, for example, the tip position of each pressing body 90 can be specified based on the number of rotations of the motor 61, so that the distance between each pressing body 90 and the axial center (of the catalyst carrier 2) is obtained. be able to. Alternatively, as shown in FIG. 5, the holder 7 is directly moved by a position measuring device 72 using a digital side length system (for example, a product name “Magnescale” manufactured by Sony Precision Technology Co., Ltd.).
Since the amount of movement such as 0 can be detected, in this embodiment, the moving distance of each pressing body 90 is directly detected by this method.

Further, on the scroll chuck 50, three holding devices 40 are mounted and fixed between the measuring devices DT at equal intervals. This is a device that performs positioning (centering) on the integrated product 4 of the catalyst carrier 2 and the buffer mat 3 before measurement, and also performs auxiliary holding during measurement.
The air cylinder 41 is configured to urge the holder 42 in the centripetal direction or the radial direction. Thus, prior to the measuring step, each holding device 40 moves in the centripetal direction to position the integrated product 4. Then, in that state, a force in the centripetal direction is lightly applied and held. During this holding state, a series of measurement is performed by the measuring device DT, and after the measurement is completed, the holding body 42 is radially driven by the air cylinder 41 to be separated from the cushioning mat 3 and return to the initial position.

FIG. 7 and FIG. 8 show a second embodiment of the multipoint measuring device, and each measuring device D in the above first embodiment.
Instead of simultaneous driving of Ts, individual driving is performed. A ball screw 74 and a rail 75 are arranged between the base BS and each holder 70. When the ball screw 74 is rotationally driven by each motor 73 fixed on the base BS, each slider 76 (shown in FIG. 8) screwed to this is driven in the centripetal direction or the radial direction, and as a result, each slider is driven. Each holder 70 fixed to 76 is configured to move in the centripetal direction or the radial direction. Each measuring device DT is a controller (Fig. 2
(Corresponding to the CT of 1) and the same amount of movement is controlled at the same time, and the same measurement as in the first embodiment is performed.

FIGS. 9 and 10 show a third embodiment of a multipoint measuring apparatus, which is an apparatus utilizing a mechanical arm type centripetal mechanism. As shown in FIG. 9, two arms 32 are rotatably supported by a pivot 31 in a case 30, and a head 33 is rotatably supported at each tip. Then, a pressing body 90 and a load cell 80 similar to those of the other embodiments are attached to the tip of each head 33.
At the other end of each arm 32, a roller follower 34 is rotatably supported in the case 30, and each roller follower 34 abuts on the outer surface (cam surface) of the cam 35, and the reaction force of each roller 32 causes each arm 32 to rotate. Is configured to swing. Further, the head 33 is rotatably supported by the tip of the cam 35, and the pressing body 90 and the load cell 80 are attached to the tip thereof. The cam 35 is configured to be driven in the vertical direction of FIG. 9 by the air cylinder 36.

When the cam 35 is driven upward in FIG. 9 by the air cylinder 36, the tips of the two arms 32 swing together with the tips of the cams 35 in the directions in which they approach each other. 90 and the load cell 80 move in the centripetal direction. As a result, after the integrated product 4 of the catalyst carrier 2 and the buffer mat 3 is centered on the shaft center, the buffer mat 3
Is compressed, it is possible to perform the same measurement as in the above embodiment. Note that FIG. 10 shows a state in which the cushioning mat 3 is compressed by the three pressing bodies 90.

In the embodiment shown in FIGS. 9 and 10,
Although the abutting surface of the pressing body 90 is formed into a concave curved surface,
As shown in FIG. 11, a pressing body 91 whose contact surface is a convex curved surface may be used. In addition, if the area of the portion that abuts on the cushioning mat 3 can be grasped, the shape of the abutting surface can be set arbitrarily. The cylinder in each embodiment is an air cylinder, but the cylinder is not limited to this, and may be a hydraulic type or an electric type.

Next, based on the above measurement results, the tubular member is subjected to diameter reduction processing or diameter expansion processing to form the holding portion of the cushioning mat 3, from the step of press-fitting the cushioning mat 3,
The process from the necking process to the end and the process to the product will be described with reference to FIGS. 12 and 13. It should be noted that the tubular member 15 (referred to as an outer cylinder or housing after processing) which is a pipe material to be processed is formed of a stainless steel tube in the present embodiment, but is not limited to this. Further, the pipe material may be appropriately formed in the previous step, or the existing pipe material may be cut. The thickness of the tube material is also arbitrary, but a thickness of about 1 to 3 mm is desirable for a catalytic converter.

First, FIG. 12 includes a step of reducing the diameter of the tubular member 15 of the tube material to form a holding portion for the integrated product 4 (at least the cushioning mat 3). The required inner diameter is, of course, set to be larger than the inner diameter after the diameter reduction processing described later. In the step (A) of the diameter reduction processing, known plastic processing such as swaging, spinning or pressing is performed on the tubular member 15 to cover the entire length of the buffer mat 3 holding portion (planned range) at the substantially center. To form a drum shape having a reduced diameter portion 16 having a substantial radius (L) inside the cushioning mat 3 holding portion which is the inner diameter adjusting portion. In this diameter reduction processing, if a core metal (mandrel) having a radius L is used as necessary, overshoot is less likely to occur, and the diameter reduction accuracy is improved. Further, in order to improve the holding force in the axial direction, an annular rib (not shown) protruding inward or outward may be formed on the reduced diameter portion 16 at the same time as the diameter reduction processing.

An important point here is that the inner radius of the reduced diameter portion 16 is L. That is, by forming the diameter-reduced portion 16 so that the inner radius becomes L, the inner radius of the buffer mat 3 holding portion having a predetermined surface pressure value simulated in the above-described measurement step is shown in FIG. Axis Z shown
The distance L from is reproduced as a medium. In the diameter reducing process, the diameter reducing device (not shown) may be automatically controlled by using the value of the distance L stored in the controller CT in the measuring process. You may comprise so that the value of the displayed distance L may be seen and input as a target value of a diameter reducing device. Alternatively,
The diameter reduction work may be directly performed by the operator.

In this embodiment, since the tubular member 15 is a cylinder, the distance L is set to the inner radius. However, in the case of an elliptical cross section, the distance L may be set to the major axis or the minor axis.
In the case of other cross sections, the distance between the shaft center and the inner wall surface may be set to L. That is, the inner radius of the cushioning member holding portion is
It does not mean only the narrowly defined radius of the cylindrical body, but the broadly defined radius (distance between the axis and the inner wall surface) in all cross sections. In the present embodiment, the distance (L) of the measurement result and the inner radius of the holding portion of the cushioning mat 3 are made to coincide, but it is not always necessary to make them completely coincide with each other, and a predetermined range based on the distance (L) of the measurement result The inside radius (distance between the shaft core and the inner wall surface) of the buffer mat 3 holding portion may be appropriately adjusted and set. That is, in consideration of a desired surface pressure value, the radius (distance between the shaft core and the inner wall surface) with respect to the distance (L) of the measurement result may be arbitrarily set within a predetermined range.

Further, in this embodiment, since the diameter-reducing process is performed by the collet type shrinker device, the shape is formed like an hourglass, but if the diameter-reduced portion 16 is finally formed, it is a tubular material. The shape of the member 15 does not matter. Of course, in the present embodiment, if the tapered portions 17 and 18 or the large-diameter openings 23 and 24 shown in FIG. 12 are unnecessary, they may be reduced in diameter, or may be reduced over the entire length. Good. In any case, it is important to grasp the inner radius (distance between the shaft core and the inner wall surface) of the buffer mat 3 holding portion itself.

Next, in the press-fitting step (B), the tubular member 15
The integrated product 4 is inserted through the large-diameter opening 23 or 24 and press-fitted until reaching a predetermined position. However, since the taper parts 17 or 18 formed at both ends of the reduced-diameter part 16 function as press-fitting guides. Since there is no need to use a press-fitting jig as in the conventional press-fitting method, problems associated with the use of the press-fitting jig do not occur. Of course, the tapered portions 17 and 18 may not be formed, and they may be press-fitted using a conventional press-fitting jig.
In particular, in the above-mentioned measurement process, when the buffer mat 3 is compressed by a plurality of pressing bodies 9x arranged side by side over substantially the entire circumference as shown in FIG. Since the size is small, when the one-piece product 4 in the state where the compressed state is restored to the state before the compression is press-fitted into the tubular member 15, the frictional resistance is small and the press-fitting can be easily performed.

Thus, after the completion of holding the integrated product 4 in the press-fitting step (B), the state in which the buffer mat 3 holds the designed surface pressure value and holds the catalyst carrier 2 in the reduced diameter portion 16 is realized. It will be. Here, the actual surface pressure value has a certain numerical range (hereinafter referred to as a surface pressure range) having an upper limit value and a lower limit value by accumulating tolerances of components, and for example, an ultra-thin wall 2 mil 90
In the case of a catalyst carrier of 0 cpsi, conventionally, a wide range of 0.05 MPa to 0.7 MPa has to be set as a surface pressure range, and an allowable margin is set against a limit value at which the catalyst carrier is damaged or cannot be retained. There were few, and there was a large risk in the process. On the other hand, in the manufacturing method of the present invention, since the surface pressure itself is substantially measured, the surface pressure range can theoretically be set to zero, and even if a measurement error is taken into consideration, an extremely narrow surface pressure range can be set. The surface pressure range of the same catalyst carrier as above is, for example, 0.2 MPa to
A very narrow range of 0.3 MPa will suffice.

As a result, the permissible margin is increased, and the degree of freedom in design is significantly increased.
That is, the conventional surface pressure range of 0.05 MPa to 0.
If it is within the range of 7 MPa, the surface pressure range (0.2 MPa to 0.3 MPa) in the production method of the present invention can be freely shifted, so, for example, if the reliability of holding the catalyst carrier is improved, By shifting each surface pressure range in the high surface pressure direction, for example, the surface pressure range from 0.3 MPa to
It may be set to 0.4 MPa. In order to realize this, in the present invention, the diameter reduction amount (or the diameter expansion amount described later) set based on the value of the distance L of the measurement result.
Can be corrected to a target surface pressure value within a specific range and set. Specifically, the above radius (distance between the shaft core and the inner wall surface) can be set with respect to the value of the distance L. Therefore, it may be set smaller or larger by a specific amount.

Next, in the commercializing step (C) for producing a catalytic converter product, plastic working such as swaging, spinning, pressing is applied to both ends obtained in the diameter reducing step (B). Then, the necking portions 20 and 21 are integrally formed. In this step (C), if a fixed work (roll revolution type) spinning process is used,
A desired shape can be efficiently obtained. In particular, when forming an inclined necking portion such as the necking portion 21, it is desirable to use the inclined spinning process described in the above-mentioned Patent Document 4. Alternatively, when forming an eccentric necking portion (not shown), it is desirable to use the eccentric spinning process described in the above-mentioned Patent Document 3. If such a spinning process is used, the tapered parts 17 and 18 and the large-diameter openings 23 and 24 formed in the previous step (A) can be processed so as to disappear at the same time, so that the processing efficiency is further improved. In addition, the degree of freedom in shape also increases.

FIG. 13 shows an integral product 4 (at least the cushioning mat 3) obtained by expanding the diameter of the tubular member 15 of the pipe material.
The tubular member 15 of the tube material is similar to the case of the diameter reduction processing of FIG. 12, but the necessary inner diameter of the tubular member 15 is The diameter is set smaller than the inner diameter. In the step (a) of expanding the diameter, the cylindrical member 15 is subjected to plastic processing such as expanding, mechanical expansion, hydraulic expansion or the like, expanding spinning, etc. It is molded into a shape having an enlarged diameter portion 22 serving as an inner diameter adjusting portion, a tapered portion 19, and an opening portion 25 having a large diameter over the entire length of the (planned range). Also in this diameter expansion processing, if an outer restraint die is used as necessary, the overshoot problem does not easily occur, and the diameter expansion accuracy is further improved.

Here again, it is important that the inside radius of the enlarged diameter portion 22 is L, and the enlarged diameter portion 22 is formed so that the inside radius becomes L. Also in this diameter expansion processing, the diameter expansion device (not shown) may be automatically controlled by using the value of the distance L stored in the controller CT in the measurement step. You may comprise so that the value of the distance L displayed by the controller CT may be viewed and input as the target value of the diameter expanding device. Alternatively, the diameter expansion work may be performed directly by the operator. If the expanded diameter portion 22 is formed, the shape of the remaining portion and the overall shape are not limited. Also in this embodiment, if the tapered portion 19 and the large-diameter opening 25 are unnecessary, the diameter may be uniformly expanded over the entire length.

Next, in the press-fitting step (b), the integrated product 4 is inserted through the large-diameter opening 25 and press-fitted until reaching a predetermined position. In this case as well, since the taper portion 19 functions as a press-fitting guide, it is not necessary to use a press-fitting jig as in the conventional press-fitting method, and no problems related to the press-fitting jig occur. After the completion of holding the integrated product 4 in the press-fitting step (b),
This means that the cushioning mat 3 is compressed and sandwiched in the expanded diameter portion 22 while maintaining the designed GBD value, and the catalyst carrier 2 is held at the designed surface pressure. Thereafter, a commercialization step (c) for producing a catalytic converter product is performed, which is shown in FIG.
Since it is the same as the step (C), the description thereof will be omitted.

The necking portions 20 and 21 are
It does not necessarily have to be formed integrally with the tubular member 15,
Separate parts may be connected by welding or the like, or may be detachable by screwing. Further, the diameter reduction processing and the diameter expansion processing are examples of steps in the manufacturing method of the catalytic converter, but in the case of manufacturing the above-mentioned DPF, a filter (not shown) is used as a pillar instead of the catalyst carrier. There is almost no difference in the process itself, as it will be used. Furthermore, the above-described measurement step and press-fitting step do not necessarily have to be performed continuously, and may be performed at different times and locations. For example, the integrated product 4 that has undergone the measurement process in one factory may be press-fitted into the tubular member 15 in another factory.

[0049]

Since the present invention is constructed as described above, it has the following effects. That is, in the method for manufacturing the column body holding device according to any one of claims 1 to 4, the cylindrical body is not affected by an error in the outer diameter of the column body, an error in the inner diameter of the tubular member, an error in the cushioning member, and the like. At least a portion of the member that holds the cushioning member can be reduced in diameter or expanded in diameter to be adjusted to an appropriate inner diameter. In particular, in the end, the variable is only the distance between the axis of the column and the tubular member, and it is always possible to set the optimum value, which is reduced or expanded. Can be reflected in the diameter. Therefore, it is possible to quickly and easily manufacture the pillar body holding device in which the pillar body is properly held in the tubular member via the cushioning member, and it is possible to reduce the manufacturing cost.

According to the manufacturing method of the column body holding device of the fifth aspect, in addition to the above effects, the column body around which the buffer member is wound can be easily press-fitted into the cylindrical member, and the manufacturing Since the time can be greatly shortened, it is possible to manufacture more quickly and easily.

[Brief description of drawings]

FIG. 1 is a perspective view showing a catalyst carrier and a cushioning mat wound around the catalyst carrier in a catalytic converter targeted by a manufacturing method according to an embodiment of the present invention.

FIG. 2 is a side view showing a measuring step of the manufacturing method according to the embodiment of the present invention.

FIG. 3 is a side view showing a measurement state in the manufacturing method according to the embodiment of the present invention.

FIG. 4 is a perspective view showing another example of measurement steps of the manufacturing method according to the embodiment of the present invention.

FIG. 5 is a plan view showing a first example of a multipoint measuring apparatus used in a measuring step of a manufacturing method according to an embodiment of the present invention.

FIG. 6 is a front view showing a first example of the multipoint measuring apparatus used in the measuring step of the manufacturing method according to the embodiment of the present invention.

FIG. 7 is a plan view showing a second example of the multipoint measuring apparatus used in the measuring step of the manufacturing method according to the embodiment of the present invention.

FIG. 8 is a front view showing a second example of the multipoint measuring device used in the measuring step of the manufacturing method according to the embodiment of the present invention.

FIG. 9 is a plan view showing a third example of the multipoint measuring apparatus used in the measuring step of the manufacturing method according to the embodiment of the present invention.

FIG. 10 is a plan view showing a part of the operating state in the third example of the multipoint measuring apparatus used in the measuring step of the manufacturing method according to the embodiment of the present invention.

FIG. 11 is a plan view showing another example of the pressing body in the third example of the multipoint measuring device used in the measuring step of the manufacturing method according to the embodiment of the present invention.

FIG. 12 is a partial cross-sectional view showing a diameter reducing step, a press-fitting step, and a commercialization step in the manufacturing method according to the embodiment of the present invention.

FIG. 13 is a partial cross-sectional view showing a diameter expanding step, a press-fitting step, and a commercialization step in the manufacturing method according to another embodiment of the present invention.

[Explanation of symbols] 2 catalyst carrier, 3 buffer mat, 4 integrated product, D
T measuring device, 5 clamp device, 8 load cell,
9 pressing body, 10 actuator, 12 rotary encoder, 16 reduced diameter portion, 22 enlarged diameter portion

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3G091 AA02 AB01 BA39 GA06 HA27                       HA28                 4D048 AA14 BA10X BB02 CA01                       CC02 CC03 CC04 CC05 CC06                 4G069 AA08 BA13B CA02 CA03                       CA18 EA19 FA01 FB69 FB70                       FB79

Claims (5)

[Claims] 1. A method for manufacturing a columnar body holding device for retaining a columnar body in a tubular member via a cushioning member, wherein the columnar body is wound around the outer periphery of the columnar body, and the columnar body is pressed by a pressing body. When the cushioning member is pressed in a direction orthogonal to the axis of the body to compress the cushioning member, and the surface pressure of the cushioning member with respect to the column is detected, and the surface pressure reaches a predetermined value. Measuring a predetermined distance between the axis of the column body and the tip of the pressing body, the column body around which the buffer member is wound,
The cushioning member is wound around the outer periphery of the columnar body with respect to the tubular member that has been reduced in diameter or expanded in advance so that the substantial radius inside at least the portion holding the cushioning member is the predetermined distance. A method for manufacturing a column body holding device, comprising press-fitting in a state. 2. The predetermined value is set based on a static friction coefficient of an outer surface of the column body, a static friction coefficient of an inner surface of the tubular member, and a pressing force of the pressing body against the cushioning member. The method for manufacturing a column body holding device according to claim 1. 3. A plurality of the pressing bodies are arranged side by side over the entire circumference of the cushioning member, and at least one of the plurality of pressing bodies is used to cushion the cushion in a direction orthogonal to the axis of the column. The method for manufacturing a columnar body holding device according to claim 1, wherein a member is pressed to compress the cushioning member, and a surface pressure of the cushioning member against the columnar body is detected. 4. The plurality of pressing members are composed of long members having a length corresponding to at least a portion of the tubular member that holds the buffer member, and the pressing members of the long members are buffered. The method for manufacturing a column body holding device according to claim 3, wherein the members are arranged side by side over the entire circumference of the member. 5. The column body, which is formed by winding the buffer member in a state from a compressed state when the surface pressure reaches a predetermined value to a state before the compression, is press-fitted into the tubular member. The method for manufacturing a column body holding device according to claim 4, wherein