JP2867850B2 - Manufacturing method of cylindrical member for cylindrical rubber vibration insulator and window member with window - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a cylindrical member used for a cylindrical vibration isolating rubber, such as an outer cylinder fitting, a cylinder part of a sleeve and a bracket in a vehicle engine mount, a cab mount, a suspension bush and the like, and a window opening. Manufacture of cylindrical member
It is about the law .

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing such a cylindrical member or a windowed cylindrical member used for a cylindrical vibration isolating rubber, for example, a method described in Japanese Patent Laid-Open No. Hei 5-177348 is known. The cylindrical member used for this has a window, and a window is necessary outside the inner cylindrical metal fitting of the liquid-containing cylindrical vibration isolating rubber for vulcanizing and bonding the rubber elastic body. And
The windowed cylindrical member is used by applying a preliminary compression to the rubber elastic body by drawing. The MadoAki tubular member, finishing the peripheral sheet metal having a width commensurate with the size and processed into a cylindrical shape, tubular shape processed butt portion tungsten-inert gas arc welding tubular anti-vibration rubber window perforated tube to be joined by It constitutes the manufacturing method of the member. For this purpose
The sheet metal is provided with holes corresponding to the windows,
The butted part processed into a shape is from one side of the sheet metal to the other
And are continuously welded and joined.

[0003]

However, in this manufacturing method, the joints formed by the tungsten inert gas arc welding are hardened and weakened at the time of welding. At the time of the drawing process in which the manufactured windowed cylinder member is substantially plastically deformed from the outer periphery to the centrifugal direction with an outer diameter ratio of about 10%, the vicinity of the joining material of the windowed cylinder member is deformed inward or cracked. Therefore, it is necessary to select a material having excellent ductility, specifically, a material having an elongation of 30% or more as a mechanical property, or a true circular shape as a windowed cylinder member is damaged.
There were many inconveniences related to the assembly of the cylindrical vibration isolating rubber, such as impairing the sealing performance.

The present invention has been made in view of the above circumstances, and holds a cylindrical or semi-cylindrical body on an electrode for power supply.
It does not require a clamp to perform
It can be easily welded and joined, and when the cylindrical member used for the cylindrical vibration isolating rubber is substantially drawn, the restriction of elongation as a mechanical property of the material used for the cylindrical member can be relaxed, and a dent near the joint is provided. It is an object of the present invention to provide a method for producing a cylindrical member with a window for a vibration-proof rubber which is unlikely to cause distortion or cracks. Sa
As a more desirable form, the limitation of elongation as a mechanical property of the material used for the windowed tubular member can be relaxed,
Distortion or cracks such as dents in the vicinity of the junction it is possible to suppress the raw Jill
Of course, the welded joint can be shorter than before,
It is an object of the present invention to provide a method of manufacturing a window- shaped cylindrical member for a rubber vibration isolator which can be joined in a short time .

[0005]

According to the present invention, in order to achieve the above-mentioned object, the first means is used for a cylindrical vibration-proof rubber.
A method of cylindrical member, the cylindrical butt end comrades lateral width direction of the metal plate having a width bending processed into cylindrical body commensurate with the finished circumferential dimension of the member, having a pair of opposing planar surfaces
Opposing surfaces forming part of each of the opposing planes.
Provided integrally with each other, and
A concave portion having an inner peripheral surface into which the outer periphery of the cylindrical member fits.
Using the cylindrical two-piece jig provided, the cylindrical body is
Part, and one jig and the other jig are relatively connected.
And bringing the ends of the cylindrical body into close contact with the pair of jigs
It is located between the opposing planes, and the pair of opposing electrodes is passed through.
Thus, from one end of the tubular body to the other end
By passing a welding current is obtained by constituting the method of the cylindrical anti-vibration rubber for tube member characterized by joining in each other dissolve to resistance welding while abutting the abutting portion abutting the said end comrades.

The second means is to form a pair of half cylinders in advance.
After that, the pair of half cylinders is
A method of members, half of the finished circumferential dimensions of the tubular member
2 so that the lateral width, a pre-metal plate to meet the min
Punching, each said plate material is said half cylinder
And a pair of opposed flat surfaces
Have the inner peripheral surface outer peripheral surface is fitted in the tubular member to the opposing planar surfaces of the
Consisting of a pair of electrodes having a pair of opposed concave portions
Each of the half-cylinders is paired with a pair of jigs
The jig and the other jig are fitted and held in a cylindrical shape
Relatively close to each other, and connect both ends of the pair of half cylinders to the pair
From one half cylinder to the other half
By applying a welding current to the cylinder, the two half cylinders
A method for manufacturing a cylindrical member with a window for a vibration-proof rubber is characterized in that it is joined by resistance welding in which butting portions having ends butted against each other are melted together. A third means is a method of manufacturing a windowed cylindrical member using a cylindrical vibration-isolating rubber, and a plate material forming process for forming a metal plate material having a width corresponding to a finished peripheral dimension of the windowed cylindrical member.
And bending the plate material so that both ends in the width direction of the plate material are the same.
Formed into a cylindrical body with a butted part where the aspirations are abutted
A cylindrical body forming step, wherein the cylindrical body is opposed to a body having electrodes.
While the cylindrical body is fitted and held by a pair of jigs,
And a welding step of resistance welding the contact portion .
In the method of manufacturing a tubular member for a tubular anti-vibration rubber, the plate material is the plate material.
During the forming process, leave both sides at least at one end in the width direction
A notch recess recessed in the width direction is formed.
The projections on both sides except for the notched recess at the time
A window is formed on the cylindrical member by resistance welding the joining portion.
The method for manufacturing a cylindrical member with a window for a vibration-proof rubber is characterized by forming the following . Fourth means in advance one
After forming the pair of half-cylinders, the pair of half-cylinders are used to form a cylindrical vibration isolator.
A method for manufacturing a windowed cylinder member used for rubber, wherein a width corresponding to half of a finished peripheral dimension of the windowed cylinder member is adjusted.
A plate material forming step of forming a pair of two metal plate materials;
Each of the two pair of plate members is bent, and the respective
Butt where both ends in the width direction of the plate are butted
A semi-cylindrical body forming step of forming the semi-cylindrical body having, it
Each of the half-cylinders is cylinder-mounted with a pair of opposed jigs having electrodes.
The butting of each of the half-cylinder bodies while
A welding joining process in which the butt portions are joined by resistance welding ,
In preparation of the tubular anti-vibration rubber for tube member and a, the
When each plate is formed in the plate forming step, the pair of two plates
Leave both sides at one end in the width direction of at least one of the plates
A notch recess is formed which is recessed in the width direction.
At the process, the butted portions on both sides excluding the notched concave portion
Forming a window in the cylindrical member by resistance welding.
And a method for producing a cylindrical member with a window for rubber vibration isolating rubber.

[0007]

[Action] As described above, the first means is bent in against the end comrades lateral direction the tubular body of the metal plate, a pair
And a part of each of the opposing planes
And a pair of opposed electrodes forming
When the outer circumference of a desired cylindrical member fits in each of the opposed planes ,
Using a cylindrical two-piece jig provided with a recess having a peripheral surface
And move one jig and the other jig relatively close to each other.
Between the pair of opposed planes of the two-piece jig.
Position, through the pair of electrodes facing each other, the cylindrical
Apply a welding current from one end of the body to the other end.
In this way, the ends are joined together by resistance welding, where the butted parts are joined together and butted together.
As a result , the tubular body is preliminarily approximately the same as the desired tubular member.
Since it can be bent into a shape, this cylindrical body is
It can be easily fitted and held in a fixed position, and the ends of the cylindrical body
Melt each other while butting the butted parts
When joining by resistance welding,
So that the cylindrical body has the desired shape and dimensions of the cylindrical member.
The member is shaped and formed, and the manufactured tubular member is divided into two parts.
It can be easily removed from the jig, very easily and
It is possible to manufacture a cylindrical member for cylindrical vibration-proof rubber with high accuracy.
You. Further, the invention according to claim 1 can control an increase in the temperature near the butt portion by adjusting the conduction current flowing at the time of welding, and can suppress the vicinity of the butt portion from hardening and becoming brittle . Formed by fitting and holding the split jig
The cylindrical vibration damping rubber for tube member, by energizing again while fitted held in divided jig easily be performed tempered by reheating the vicinity bonding, temper thus
Processing when drawing the cylindrical rubber vibration isolator for cylindrical member obtained I line Do reduced in diameter to substantially centripetal direction from its outer periphery, it is possible to suppress the deformation near the joint is recessed inwardly, cracking Can be suppressed, and restrictions on mechanical properties for selecting the material of the plate material can be relaxed. In the second means, as above, place
The width is half the finished circumference of the desired tubular member
In this way, two metal plates are punched in advance,
Each of the plate members is bent into the half-cylinder body, and a pair of
And a cylindrical member provided on each of the opposing planes.
A pair of opposing recesses having an inner peripheral surface with which the outer peripheral surface of the
Using a cylindrical two-piece jig consisting of a pair of electrodes with
Te, each of the semi-cylindrical body and cylindrical shape fitted coercive <br/> lifting the said pair of recesses, are relatively close to one jig and the other jig, the
Position both ends of a pair of half cylinders between the pair of opposing planes.
And then apply a welding current from one half-cylinder to the other half-cylinder
By, joined by resistance welding to dissolve each other while butting the butt portion abutted the ends comrades of the pair of semi-cylindrical body, so to produce a cylindrical anti-vibration rubber for tube member, bisected cylindrical body In advance, make it almost the same shape as the desired tubular member
It can be bent, and this two-part cylindrical body is
Can be easily fitted and held at the position of
While matching the butting parts that match the end comrades,
When joined by resistance welding that melts into
The shape and size of the desired cylindrical member is determined by dividing the cylindrical body into two parts by the jig.
The cylindrical member is shaped and manufactured to
Can be easily removed from the two-piece jig,
Extremely easy and accurate cylindrical member with window for rubber anti-vibration rubber
Can be manufactured. According to the second aspect of the present invention, similarly to the first aspect of the present invention, it is possible to suppress the vicinity of the butted portion from being hardened and weakened, and to once fit the split jig.
The cylindrical jig for holding the anti-vibration rubber formed by holding
The tempering process can be easily performed in the vicinity of the joint while the fitting is being held, and the cylindrical anti-vibration rubber manufactured or assembled using the cylindrical member obtained by performing the tempering process in this manner. In order to apply the pre-compression to the rubber elastic body, during the drawing process in which the diameter of the cylindrical member is reduced substantially in the centripetal direction from the outer periphery thereof, it is possible to suppress the deformation in which the vicinity of the joint is depressed inward, and the crack is generated. It is possible to suppress the occurrence, and to alleviate the restriction on the mechanical properties for selecting the material of the plate material. Third means
Means that the plate material is at least one in the width direction during the plate material forming step.
Notch recesses formed in the width direction leaving both sides at the ends
The cylindrical body is fitted and held with a pair of opposed jigs having electrodes.
While holding the butt portion of the cylindrical body by resistance welding.
Excluding the notched recesses while leaving the both sides during the welding process
By joining the butted portions on both sides by resistance welding
Since a window is formed in the cylindrical member, resistance welding is used.
At the time of joining, the cylindrical body is moved to a desired cylindrical portion by the two-piece jig.
When the cylindrical member is shaped and formed to the shape and size of the material
In both cases, the manufactured tubular member is easily taken out of the two-piece jig
Very easily and accurately
Can be manufactured with welded joints
The part can be shortened. The fourth means is that each plate material is
In the material forming step, at least one plate of the pair of two plate materials
Notch recessed in the width direction leaving both sides at one end in the width direction of the material
Recesses are formed, each half-cylinder having an electrode
The semi-cylindrical body is fitted and held in a tubular shape with a pair of opposed jigs.
Butt each butted part of
During the welding process, the cut-out recesses are removed on both sides.
The butted part is connected to the cylindrical member by resistance welding.
Since the window is formed, it is joined by resistance welding
At this time, the cylindrical body is shaped into a desired cylindrical member by the two-piece jig.
And the dimensions of the cylindrical member are kept
It is easy to take out the manufactured cylindrical member from the two-piece jig.
Able to open the window for rubber anti-vibration rubber very easily and accurately
Can produce cylindrical members and shorten welded joints
it can.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
A method of manufacturing a cylindrical member used for a cylindrical vibration isolating rubber such as a cylindrical engine mount will be described. (Example 1) As shown in FIG. 1, feeding the steel plate 1 wound in a conventional manner in a roll punching press machine 2, the width direction plate 3 having a width commensurate with substantially finished circumferential dimension Punch at intervals. Although not shown, the side of the plate 3 is not shown.
Notch recessed in the width direction leaving both sides at both ends in the width direction
Can be applied.

Next, as shown in FIG. 2, the punched sheet material 3 is bent by a bending press (not shown) at both ends 3a in the width direction.
3b in the circumferential direction, butted into a cylindrical body 30a having a right cylindrical shape.
To form Notches are formed at both ends in the width direction of the plate 3.
Is applied to the cylindrical body 30 corresponding to the notch recess.
a, forming a window 32 as shown by a dashed line.
it can.

[0010] Thereafter, as shown in FIG. 3, a pair of opposed
Have planes and form part of their respective opposing planes
Opposing electrodes 101a and 102a are integrally provided.
And a cylindrical body 30a on the outer peripheral surface
A recess having inner peripheral surfaces 101b and 102b to be fitted
The outer circumference of the cylindrical body 30a using the cylindrical two-piece jig 100
The surface of the cylindrical body 30a is formed on the inner peripheral surfaces 101b and 102b of the concave portions.
Only the both ends are protruded from the opposing plane and are fitted and held as a whole, and the butting portion 31 of the tubular body 30a is fixed to the lower half jig 1
One electrode 101 of the resistance welding machine provided on the upper right side of 01
a , and the upper half jig (the other jig)
Tool 102) near the other electrode 102a provided on the lower right side of the
Touch the lower half jig (one jig) 101
Move the upper half jig (the other jig) 102 downward from one side
While making one jig 101 and the other jig 102
And close the ends 3a and 3b of the cylindrical body 30a into two parts.
One jig facing the split jig 100 (lower half split jig) 1
01 and the other jig (upper half jig) 102
Form each opposing plane by positioning between opposing planes
Through a pair of electrodes 101a and 102a
By applying a welding current from one end portion to the other end portion, the cutout recesses where the ends were butted were removed.
A neat cylindrical anti-vibration rubber cylinder member (hereinafter, referred to as a cylinder member) joined by resistance welding in which the butted portions on both sides are melted into each other while being butted together, and joined in a substantially perfect circle.
Is a cylindrical member with a window for rubber anti-vibration rubber.
30 ) can be manufactured .

Thereafter, the joined cylindrical member 30 is set in the cavity of the mold, and the inner cylindrical member 35 is disposed inside the windowed cylindrical member 30, so that the cylindrical member 30 and the inner cylindrical member 35 are connected to each other. A rubber material was injected into the space and then vulcanized to produce a rubber bush 300 in which a rubber elastic body 36 was bonded and interposed between the cylindrical member 30 and the inner cylindrical fitting 35 as shown in FIG.

As shown in FIG. 5, an inner peripheral surface of a bracket 310 comprising another metallic cylindrical member 301 and a mounting arm portion 302 which is resistance-welded to the outer peripheral surface of the other cylindrical member 301 is provided. A drawing process for plastically deforming the cylindrical member 30 in the centripetal direction from the outer periphery of the cylindrical member 301 of the rubber bush 300 is performed, and as shown in FIG. Was assembled.

The cylindrical member 301 of the bracket 310
Is manufactured by the same method as the cylindrical member 30 of the vibration isolating bush 300, and has a joint portion 303 which is resistance-welded.

(Embodiment 2) FIGS. 7 to 13 illustrate still another embodiment . Two half cylinders (half cylinder bodies) 40 shown in FIGS. 10 and 11 are shown.
From a, it is used for the cylindrical anti-vibration rubber 440 shown in FIG.
A method of manufacturing a windowed cylinder member 40 (see FIG. 13),
First, punching pressing machine (not shown), the steel sheet similarly coiled Example 1, the width direction shown in FIG. 7
Notch recess 4 that is recessed in the width direction, leaving both sides at both ends
The plate material 4 provided with a and 4a is punched.

Next, as shown in FIGS. 8 and 9, the plate member 4 is set on the lower die 301 of the bending press 300, and
01 by pressing the upper mold 302 against the plate material 4.
Of the windowed cylinder member 40 as shown in FIGS.
Semi-cylindrical ( half-cylindrical body ) 40 with a width that matches the rising circumferential dimension
a is bent at least two times.

Next, as shown in FIG. 12, a pair of semi-cylindrical bodies 40a, 40a are fitted in respective semicircular arcs to the outer peripheral surfaces thereof.
Relative with a recess having inner peripheral surfaces 101a, 102a
Cylindrical jig 101 that can approach and separate from each other
102, with the circumferential ends of the semi-cylindrical same Zhi 40a,
Butted except for the notched concave portions 4a, 4a,
Both ends of 40a, 40a are each one jig 201
And between the mating surfaces of the other jig 202 and
Each of the one jig 201 and the other jig 202
Each of the concave portions 101a and 102a is held by being fitted to a semicircular inner peripheral surface . In addition, these one jig 201 and
The other jig 202 is used as a pair of split electrodes of a resistance welding machine.
Is formed. Therefore, by moving a welding current from one electrode (jig) 201 to the other electrode (jig) 202 while moving the other electrode (jig) 202 downward, the butted butted portions 41, 41 are brought together. As shown in FIG. 13, a windowed cylindrical member 40 which can be joined by resistance welding so as to be melted and which is joined in a substantially right circular cylindrical shape having a window 42 can be manufactured.

The windowed cylindrical member 40 is set in a cavity of a rubber injection molding die (not shown), and an inner tube fitting 45 is set inside the windowed cylindrical member 40, and the space is set in these spaces. After the rubber material is injected and vulcanized, the window elastic cylindrical member 40 and the inner cylindrical fitting 4 are formed by the rubber elastic body 46 having the first concave portion 46a and the second concave portion 46b.
5 was integrally fixed to the rubber bush 400.

Thereafter, as shown in FIG. 15, the first concave portion 46a and the second concave portion 46b are filled with liquids 48 and 49, respectively.
The rubber bush 400 was pressed into the inner peripheral surface of the cylindrical outer tube fitting 47. Then, by drawing in the centripetal direction from the outer periphery of the outer cylinder fitting 47, the outer cylinder fitting 47 and the windowed cylinder member 40 are plastically deformed in a reduced diameter state, and the rubber elastic body 46 is pre-compressed. Liquid-filled cylindrical vibration-proof rubber 44
0 was produced.

The steel plates used for the windowed tubular members 30 and 40 of the above embodiment are both 1.6 mm thick steel plates (SS330).
Although the elongation was 26%, in order to give preliminary compression to the rubber elastic bodies 35 and 45, even if the windowed cylinder members 30 and 40 were both drawn with an outer diameter ratio of 5 to 10%, No cracks and dents were formed near the resistance welded joint.

Further, according process as is easily welded any, after the cylinder in the jig 100 and 200 having the electrodes were joined by resistance welding so is fitted retained, as it easily while fitted held Tempering treatment can be performed, and the vicinity of the joint can be softened.

Further, in the second embodiment , if welding is performed on both sides except for the cutout recess 4a which is recessed in the lateral width direction , the joining portion can be shortened. Therefore, there is an advantage that the temperature rise is small and the joining time can be shortened. doing.

Further, when joining by such resistance welding, there is an advantage that both ends in the length direction can be joined cleanly.

[0023] While in the embodiment MadoAki tubular member has a circular, rectangular, oval, is also configurable polygonal, and the present invention is appropriately set to each of the embodiments described above
Needless to say, the present invention can be implemented in other forms without departing from the gist of the present invention.

[0024]

According to the present invention, in a method of manufacturing a tubular member or a windowed tubular member used for a tubular vibration-isolating rubber, it is possible to suppress a rise in temperature near the weld joint during welding and to harden the vicinity of the weld joint. In order to apply a pre-compression to the elastic body of the cylindrical vibration isolating rubber, even if the cylindrical member is substantially drawn, cracks generated near the weld joint can be prevented and almost inwardly depressed. Deformation is less likely to occur, and the material used for the windowed cylinder member is less likely to be restricted in elongation as a mechanical property.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a method for processing a plate material according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram for processing a plate material shown in FIG. 1 into a cylinder.

FIG. 3 is an explanatory view for manufacturing a cylinder member by fitting and holding the cylinder shown in FIG. 2 to a pair of jigs and resistance-welding a joint portion.

FIG. 4 is a front view of an anti-vibration bush manufactured using the tubular member obtained in FIG.

FIG. 5 is a front view of the bracket.

FIG. 6 is a front view of a bracket-type cylindrical vibration-isolating rubber which is press-fitted after drawing the vibration-isolating bush of FIG. 4 into the bracket of FIG. 5;

FIG. 7 is a plan view of a plate member according to a second embodiment.

FIG. 8 is a crushed cross-sectional view showing a cross section of a main part of a bending press used in Example 2.

FIG. 9 is a crushed cross-sectional view showing a cross section of a main part of a bending press used in Example 2.

FIG. 10 is a vertical sectional view of the center of a half cylinder formed by bending the plate material in FIG. 7 using the bending press shown in FIGS. 8 and 9;

FIG. 11 is a plan view of FIG. 10;

FIG. 12 is a front view showing a state in which two half cylinders of FIGS. 10 and 11 are butted together and fitted and held on a pair of half split jigs, and the butted portions of the half cylinders are resistance welded.

FIG. 13 is a perspective view of a windowed cylinder member obtained by abutting half cylinders in FIG. 12 and welding the butted portions by resistance welding.

FIG. 14 is a longitudinal sectional view of an anti-vibration bush manufactured using the windowed cylinder member of FIG.

15 is a longitudinal sectional view of a liquid-filled cylindrical vibration-isolating rubber manufactured by press-fitting the vibration-isolating bush of FIG. 14 into an outer cylinder.

[Explanation of symbols]

 3, 4: plate material 30, 40: cylindrical member(Cylinder or windowed cylinder)  31, 41: Butting portion 100, 200: A pair of split jigs (two split jigs) 101, 201: Lower half jig 102: 202 Upper half jig

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B23K 11/02

Claims (4)

(57) [Claims] (1)Manufacturing method of cylindrical member used for cylindrical rubber vibration insulator
And  Finish of the tubular memberWeekMatch the dimensionssideMade of metal with width
Butted ends of the plate material in the width direction into a cylindrical bodybending
Processed,A pair of opposing planes and each pair
The pair of opposing electrodes forming a part of the facing plane are integrated
And the outer periphery of the tubular member is provided on each of the opposed planes.
Cylindrical halves with recesses with mating inner peripheral surfaces
Using a jig, project the cylindrical body into the recess only at both ends.
Let out and fit in overallHold andOne jig and the other jig
Are relatively close to each other, and the ends of the cylindrical body are
The tool is positioned between the pair of opposing planes of the
Through a pair of electrodes, from one end of the tubular body to the other
By applying a welding current to the end of theSudden
Melt into each other while butting the butted parts
Masu resistance weldingAtCylindrical vibration isolation characterized by joining
Manufacturing method of rubber tubular member. (2)After forming a pair of half cylinders in advance,
The method of manufacturing the tubular member used for the rubber damper
So,  Finish of the tubular memberWeekOf dimensionsHalfSuitable forsideBecome wide
like,Two pieces of metal plate material are punched in advance.
Each plate materialEachBending on the half cylinderProcessed,Pair of
An opposite plane, and the cylindrical section
A pair of opposing recesses having an inner peripheral surface into which the outer peripheral surface of the material fits
Using a cylindrical two-piece jig consisting of a pair of electrodes with
Then, each of the half-cylinders is cylindrically inserted into the pair of recesses.
The entire end is fitted by protruding only both ends ofHold andOne
The jig and the other jig are relatively approached, and the pair of half cylinders
Are positioned between the pair of opposing planes.
By passing a welding current from one half cylinder to the other half cylinder,
The two ends of the pair of half cylinders areButted butted part
Are joined by resistance welding that melts into each other while
A method for producing a tubular member for a tubular anti-vibration rubber, comprising: 3. A cylindrical anti-vibration rubber is used.Window openingOf cylindrical member
Manufacturing method, whereinWindow openingHas a width that matches the finished circumference of the cylindrical member
MetalForm plate Plate forming process,The plate is bent, and both ends in the width direction of the plate protrude.
A cylinder formed in a cylindrical body having a butted portion to be joined
Shape forming process and ,The cylindrical body is fitted and held by a pair of opposed jigs having electrodes.
While joining the butt portion of the tubular body by resistance welding
Welding joining process,  ToIn the method of manufacturing a tubular member for a tubular anti-vibration rubber provided, The plate material is at least one end in the width direction at the time of the plate material forming step.
Notch recesses formed in the width direction leaving both sides
The notch recess is formed by leaving both sides during the welding joining process.
The butted portions on both sides removed are joined by resistance welding
Characterized in that a window is formed in the cylindrical member. Cylindrical anti-vibration
For rubberWindow openingManufacturing method of cylindrical member. (4)After forming a pair of half cylinders in advance,
Of windowed cylinder members used for semi-cylindrical
Manufacturing method, Finished peripheral dimensions of the windowed cylinder memberof
HalfSuitable forForm a pair of two metal plates with width
Plate forming process,Each of the two pair of plate members is bent, and the respective
Butt where both ends in the width direction of the plate are butted
A half-cylinder forming step of forming the half-cylinder having ,A pair of jigs each having an electrode
While holding in a cylindrical shape with
Welding joining process in which the joints are joined by resistance welding
When,  ToIn the method of manufacturing a tubular member for a tubular anti-vibration rubber provided, At the time of the plate material forming step, each of the two plate materials is
Leave both sides at one end in the width direction of at least one of the plate materials
As a result, a notch recessed in the width direction is formed.
Butting portions on both sides excluding the notched concave portion during the joining process
Forming a window in the cylindrical member by resistance welding
Characterized by For cylindrical anti-vibration rubberWindow openingManufacturing method of cylindrical member.