JP3592988B2 - Method and apparatus for manufacturing welted metal core - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a manufacturing method and a manufacturing apparatus for a welt core metal, in particular, a core bar to be embedded in a welt portion having a substantially U-shaped cross section as represented by a weather strip for automobiles and a welt body side, The present invention relates to a manufacturing method and a manufacturing apparatus for continuously manufacturing a coil material such as a strip-shaped steel sheet as a substantially ladder-like material.
[0002]
[Prior art]
In the case of a weatherstrip or a weld body side that seals the gap between the door or glass of an automobile and the opening edge on the vehicle body side, a core made of metal or the like is used to improve the shape retention of the welt portion having a substantially U-shaped cross section. Gold is buried. For example, as described in Japanese Patent Application Laid-Open No. 5-237904, a plurality of strip-shaped bone pieces parallel to each other are connected to each other at a bridge portion at an end in the width direction. As described above, a ladder-like flat plate is often used. The welt portion is formed into a developed shape by extruding a predetermined rubber material or resin material so as to cover a flat cored bar, and then performing a predetermined bending process to obtain a substantially U-shaped cross section. Finished.
[0003]
On the other hand, as a method of manufacturing a core metal having a substantially ladder shape as described above, for example, as described in Japanese Patent Publication No. Sho 63-52971, each end face of a strip-shaped metal plate having a predetermined width is chamfered. A fan-shaped bite is formed in advance at an equal pitch by pressing the roll, and then a band-shaped metal plate is pressed in the plate thickness direction with a pair of sawtooth gears so that a cut extending in the width direction at a position coinciding with the bite is partially prevented. It is formed in a continuous form, and finally, the discontinuous portion of the cut is rolled by a rolling roll, so that a large number of parallel strip-shaped bone pieces are connected to each other at the discontinuous portion. 2. Description of the Related Art A technique for extending and forming a substantially ladder shape is known.
[0004]
[Problems to be solved by the invention]
In this conventional method of manufacturing a welded core, in order to prevent burrs from being generated at both ends in the width direction of the bone fragments that are separated from the above-mentioned cut, a position where the cut coincides with the cut is set. The fan-shaped bite is formed in advance, but this biting process is a processing method in which the sharp biting blade of the chamfering roll is immediately pressed against the end of the strip-shaped metal plate that has not been subjected to any pre-processing. Therefore, not only the wear of the biting blade is remarkably lacking in the durability of the chamfering roll, but also the bite amount varies due to the abrasion, and the processing quality is not stable.
[0005]
In addition, since the pitch of the bite and the pitch of the cut to be processed by the saw gear afterward are both small, it is necessary to match the position of the bite that has been pre-processed in advance when processing the cut. Since it is difficult, and even if the positions of both are slightly deviated, the processing quality is rather deteriorated, it takes a lot of man-hours to match the synchronization accuracy between the saw tooth gear and the chamfering roll, and furthermore, to make the bite and cut positions coincide with each other. As a result, it is not preferable.
[0006]
The present invention has been made in view of the above problems, by performing the chamfering instead of the above-mentioned bite processing after rolling, to obtain a processing quality equal to or more than the conventional, and furthermore An object of the present invention is to provide a manufacturing method and a manufacturing apparatus for a welt core metal, which can significantly improve the durability of a jig for chamfering.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 is a weld metal core having a substantially ladder shape as if a number of strip-shaped bone pieces parallel to each other were connected to each other at a bridge portion partially left therebetween. A slit process is performed on a long coil material, which is a material, with a slitter roller, and a linear and unexpanded portion extending in the width direction of the coil material except for a portion to be the bridge portion. A step of forming slits in a predetermined pitch at a predetermined pitch, and rolling the bridge portion with a rolling roller following the slitting process, separating the bone fragments from each other at a portion other than the bridge portion while expanding the slit. And a step of extending and forming the whole into a substantially ladder-like shape, and following the rolling process, on both end surfaces in the width direction of the coil material.Gear shapedPressing the chamfering jig and chamfering the corner edge of each bone fragment.Contains.
Moreover,In the chamfering step, a chamfering jig is engaged with the slits at both ends in the width direction of the coil material, and the two are relatively moved to perform a chamfering process in a round chamfering shape on a corner edge portion of each bone fragment.It is characterized by:
[0008]
Also, billingItem 4The described invention is an apparatus for manufacturing a welt core metal having a substantially ladder shape as if a number of parallel strip-shaped bone pieces were connected to each other by a bridge part partially left between them. In a linear and unexpanded state, a long coil material as a material to which continuous feeding is applied is pressed in the plate thickness direction and extends in the width direction of the coil material except for a portion to be the bridge portion. A slitter roller that forms slits at a predetermined pitch, and a portion other than the bridge portion, which is provided on the subsequent stage side of the slitter roller, performs rolling on the bridge portion of the coil material after the slit process, and expands the slit to expand the slit. A rolling roller that separates the bone fragments from each other and stretches and forms a substantially ladder-like shape as a whole, and is provided on the subsequent stage side of the rolling roller, and is a width direction of the coiled material after rolling.For slits at both endsBy moving relative to each other while meshing,Are chamferedIt is characterized by comprising a gear-shaped chamfering jig for chamfering, and a straightening roller provided on the subsequent stage side of the chamfering jig and correcting the coil material after chamfering by applying a pressure in a plate thickness direction. I have.
[0009]
thisClaim 2As described above, the coil material is continuously fed in the longitudinal direction, and it is more preferable that the chamfering jig rotates as if the chamfering jig is driven in accordance with the feeding operation of the coil material itself.
[0010]
Therefore, the above claimItems 1 and 4In the described invention, unlike the conventional method, a slit process for forming a linear and unexpanded slit to divide the coil material into an aggregate of many bone fragments, and expanding the slit to expand the bone Following the rolling process of extending and forming the pieces as a whole in a ladder shape, chamfering is performed thereafter. Then, the chamfering is performed for the purpose of rounding the edge portion while removing the burrs of the corner edge portions at the width direction both ends of each bone fragment independent from each other by expanding the slit. Therefore, the intended purpose is achieved by facing the chamfering jig to the open end of the previously expanded slit and pressing the chamfering jig against the corner edges of the bone fragments on both sides of the slit. You.
[0011]
At this time, the chamfering jig does not need to directly bite into the end of the coil material that has not been subjected to any pre-processing as in the past, and if the chamfering jig faces the open end of the slit as described above, The jig autonomously presses the corner edges of the bone fragments on both sides separated by the slit to perform plastic working.
[0012]
This tendency isItems 1 and 4As in the described invention, the chamfering jig is gear-shaped, and it becomes even more prominent when the two are relatively moved as if the relationship between the reference rack tooth profile at the time of gear cutting and the involute tooth profile created by the tooth profile, In particular, the above claimItem 2When the chamfering jig is driven by utilizing the feed force given to the coil material itself as in the invention described, no special driving means for chamfering only is required.
[0013]
ClaimItem 3The claimed invention is claimedItem 1 or 2The method is characterized in that the method includes a step of correcting the coil material by applying a pressure to the coil material in a sheet thickness direction with a correction roller, following the chamfering process in the invention described in the above.
[0014]
Therefore, this claimItem 3According to the described invention, the distortion and the like of the coil material itself caused by slitting, rolling, and further chamfering will be corrected by the final straightening process. Even if it rises due to plastic deformation in the thickness direction, it will be corrected at the same time.
[0015]
【The invention's effect】
ClaimItems 1 and 4According to the described invention, after slitting and rolling,With a gear-shaped chamfering jig,Since the chamfering process is performed, and since the chamfering process is a method of chamfering by pressing a chamfering jig between the bone pieces separated from each other by expanding the slit, the conventional chamfering process is performed. It is different from that in which a tool is suddenly cut into a part that has not been pre-processed.Become a chamfering jigThere is no problem with the wear and durability of the welding, and there is no variation in the pressed state and the processing position accuracy. is there.
[0016]
Moreover, the gear-shapedSince the chamfering jig is engaged with both end surfaces in the width direction of the coil material and the two are relatively moved, the corner edge of each bone fragment is chamfered.Jig andHas an effect that the positional accuracy can be extremely easily obtained.
[0017]
In addition, billingItem 2According to the described invention, the coil material is provided with continuous feed in the longitudinal direction, and rotates as if a gear-shaped chamfering jig is driven according to the feed operation of the coil material itself. Therefore, there is an effect that special driving means is not required for chamfering.
[0018]
ClaimItem 3According to the invention described above, since the step of correcting the coil material by applying a pressing force in the sheet thickness direction with a straightening roller following the chamfering process is included, one of the coil materials is slit, rolled, and further chamfered. Even if a distortion or the like is generated in the portion, it can be reliably corrected, so that there is an effect that the processing quality, particularly the smoothness, of the welt core metal is further improved.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
FIGS. 1 and 2 are a front view and a side view, respectively, showing an outline of a manufacturing method and an apparatus according to a preferred embodiment of the present invention, and FIG. 3 is an example of a welt core manufactured by the present invention. 4 and the drawings following FIG. 4 show details of the main parts in FIGS.
[0020]
As shown in FIG. 3, the welt core 1 connects a plurality of strip-shaped bone pieces 2, 2... Mutually parallel to each other at bridge portions 3 at both ends in the width direction. Are formed in a substantially ladder shape by forming slits 4 and 5 between 2, 2,.... A steel sheet is used as a base material and is continuously formed by a roll forming method mainly comprising printing pressure and rolling.
[0021]
As shown in FIGS. 1 and 2, a long coil material (strip-shaped steel sheet) W cut in advance to a predetermined width dimension is continuous in its longitudinal direction by a pulling force by a pair of straightening rollers 15, 16 described later. Feeding is given, so that the coil material W travels at a constant speed, for example, from right to left in FIG.
[0022]
A pair of upper and lower slitter rollers 6, 7 for slitting, a plurality of guide rollers 8, 9, 10 for accumulating and a pair of upper and lower rolling for rolling along the traveling path of the coil material W in order from the upstream side. In addition to the rolling rollers 11 and 12, a pair of left and right chamfering jigs 13 and 14 for chamfering and a pair of upper and lower straightening rollers 15 and 16 for straightening are respectively disposed.
[0023]
The slitter rollers 6, 7 are cylindrical gears formed to be wider than the width of the coil material W, and the outer peripheral surfaces of the respective slitter rollers 6, 7 have sharp slit projections 6a, 7a. The slits are formed at a pitch, and are set so that the tops of the projections 6a and 7a always mesh with each other by the two slitter rollers 6 and 7 being synchronously driven in response to the feed of the coil material W itself. . Therefore, when the coil material W passes between the two slitter rollers 6 and 7, the unexpanded slits 4a extending in the width direction are linearly pressure-formed at equal pitches, and the coil material W A large number of bone pieces 2, 2... Partitioned by the expanded slit 4a are connected to each other.
[0024]
However, in the projections 6a and 7a of the slitter rollers 6 and 7, the projections 6a and 7a are locally cut off at portions corresponding to the bridge portions 3 of the core metal 1 for welt to form missing portions 6b and 7b. Therefore, at the same time as the formation of the unexpanded slits 4a in the coil material W, the slits 4a are not formed in the portions corresponding to the missing portions 6b and 7b, and are left as the bridge portions 3 as they are.
[0025]
The coil material W that has passed through the slitter rollers 6 and 7 is supplied to a pair of rolling rollers 11 and 12 at the subsequent stage via guide rollers 8 to 10 for accumulation. The pair of rolling rollers 11 and 12 is a solid cylindrical member formed wider than the width of the coil material W, whereas the lower rolling roller 12 is formed as a simple cylindrical member. A pair of annular projections 11a is formed on the outer peripheral surface of the upper rolling roller 11 at a position corresponding to the bridge portion 3, and both of the rolling rollers 11, 12 also respond to the feed of the coil material W itself. Rotationally driven in synchronization with each other.
[0026]
Therefore, when the coil material W after the slit processing passes between the pair of rolling rollers 11 and 12, the bridge portion 3 is rolled by the corresponding annular protrusion 11a. That is, in the portion corresponding to the bridge portion 3, the bridge portions 3 and 3 are crushed from the upper side to the lower side by the annular protrusion 11a so as to be continuous with each other, and as a result, the coil material W is expanded. Is extended in the longitudinal direction at the bridge portion 3 as if the slit 4a had been applied, so that the slit 4a, which had not been expanded, was expanded to slits 4, 5 having a predetermined width. Then, the coil material W after rolling is chamfered in the subsequent stage.jig13 and 14 are supplied.
[0027]
The above-mentioned chamfering jigs 13 and 14 are opposed to both sides of the coil material W unlike the slitter rollers 6 and 7 and the rolling rollers 11 and 12. As shown in FIG. 4, a chamfered tooth 17 having a reference rack tooth shape is formed on the surface, so that the entire surface is formed as a spur gear having a relatively small tooth thickness. Then, by appropriately adjusting the distance between the axes of the chamfering jigs 13 and 14 so as to press the chamfering jigs 13 and 14 against both end surfaces of the coil material W, the chamfering teeth of the chamfering jigs 13 and 14 are adjusted. 17 are set so as to always mesh with the slits 5, 5,... At both ends of the coil material W.
[0028]
Therefore, in the process in which the coil material W that has passed through the rolling rollers 11 and 12 that have been previously extended travels toward the straightening rollers 15 and 16 that follow, the coil material W is released at both ends of the coil material W as shown in FIG. The chamfering teeth 17 of the chamfering jigs 13 and 14 are engaged with the slits 5 that are formed, and the respective chamfering jigs 13 and 14 rotate at a fixed position as the coil material W travels, as if driven. , Which are located on both sides of the slit 5, the tooth surfaces of the chamfered teeth 17 are pressed against the corner edge portions 2a at both ends of the bone fragments 2, 2,..., And chamfering by plastic deformation is performed. .
[0029]
More specifically, as shown in FIG. 4, the chamfering teeth 17 of each of the chamfering jigs 13 and 14 have a reference rack tooth shape, and the corner edge portions 2a of the respective bone fragments 2, 2. Since the chamfering jigs 13 and 14 rotate with the running of the coil material W in this state, each corner edge portion 2a has an involute tooth profile as if the tooth profile is formed by meshing the reference rack tooth profile and the involute tooth profile of the spur gear. Such a chamfer having a predetermined roundness is performed. In addition, FIG.Cross hatchingThe portion indicates a region of the corner edge portion 2a that is actually plastically deformed. This chamfering processing also includes removal of burrs generated at the corner edge portion 2a when the unexpanded slit 4a of the coil material W is expanded at portions corresponding to the slits 5 at both ends thereof. The coil material W, which has been chamfered at the corner edges 2a at both ends of each bone fragment 2, 2,..., Is supplied to the subsequent correction rollers 15, 16.
[0030]
The pair of straightening rollers 15 and 16 are formed of a simple solid cylinder wider than the width dimension of the coil material W, and the coil material W that has been chamfered first is used for both the straightening rollers 15 and 16. When passing between them, portions other than the bridge portion 3 which is concave in the coil material W are entirely pressed by the so-called flat pressing principle, and are generated during the preceding slitting or rolling. The distortion or deformation of the coil material W is corrected so as to be removed, and even if the corner edge portion 2a of each of the bone fragments 2, 2... Is corrected at the same time as if restoring.
[0031]
Thus, according to the present embodiment, unlike the related art, after the slit processing and the rolling processing are performed, and before the correction processing, the gear-shaped slits 5, 5,. The chamfering jigs 13 and 14 are engaged with each other, and the chamfering jigs 13 and 14 are rotated as the coil material W travels, thereby chamfering the corner edges 2a of the bone pieces 2, 2,.... .. And the chamfered teeth 17 are reliably and smoothly engaged with each other, so that the corner edges 2a of the bone fragments 2, 2,. improves. In addition, since the chamfering jigs 13 and 14 rotate with the running of the coil material W and come into pressure contact with the corner edge portion 2a, no excessive force is applied and the chamfering jigs 13 and 14 are specially rotated. A simple drive source is not required, and the durability of the chamfering jigs 13 and 14 is also improved.
[0032]
FIG. 5 is an explanatory side view showing details of a more specific processing unit 20 including the rolling rollers 11 and 12, the chamfering jigs 13 and 14, and the correction rollers 15 and 16 in FIGS. 5 is an explanatory plan view of FIG. 5, FIG. 7 is an enlarged view of a main part thereof, and FIG. 8 is a sectional view taken along line AA of FIG.
[0033]
As shown in FIGS. 5 to 8, a pair of left and right side frames 21 and 21 erected at a predetermined distance so as to face each other are connected by a plurality of tie rods 22. A pair of upper and lower correction rollers 15 and 16 as well as a pair of upper and lower rolling rollers 11 and 12 are rotatably supported at both sides so as to be located within the opposing space 21. A pair of front and rear table plates 23 and 24 for guiding the running of the coil material W are disposed between the rolling rollers 11 and 12 and the straightening rollers 15 and 16 together with chamfering jigs 13 and 14 described later. Therefore, the coil material W travels on the table plates 23 and 24.
[0034]
While the lower correction roller 16 of the pair of correction rollers 15 and 16 is directly supported at both sides by the side frames 21 and 21, the upper correction roller 15 is supported by the side frames 21 and 21. Both ends are supported by an adjustable plate 25 which can be moved up and down and is independent on the left and right. The adjusting plate 25 is screwed with an operating screw 26 which is also independent on the left and right and an integral thread 27. Therefore, the upper correction roller 15 moves up and down together with the adjustment plate 25 in accordance with the rotation operation of each operation handle 26.
[0035]
That is, by appropriately rotating the operation handles 26 that are independent on the left and right, the upper correction roller 15 moves up and down, and in addition to the parallelism between the lower correction roller 16 and the correction roller 15, 16 The distance between the shafts and the pressing force for correction can be adjusted. Then, one of the pair of correction rollers 15 and 16 is rotationally driven by rotation driving means (not shown) in order to apply feed to the coil material W itself. However, a take-up roller dedicated to taking up the coil material W may be provided further downstream of the straightening rollers 15 and 16 and feed may be applied to the coil material W by the take-up roller. In addition, the two operation handles 26 have different heights to avoid mutual interference.
[0036]
On the other hand, the upper rolling roller 11 that is paired with the lower rolling roller 12 is also provided with independent operation handles 28 on the left and right similarly to the above, and the relationship between the pair of upper and lower rolling rollers 11 and 12 is corrected. Just like the rollers 15 and 16, the parallelism and the distance between the axes can be adjusted as appropriate. Then, when the coil material W passes between the pair of rolling rollers 11 and 12, the bridge portion 3 of the coil material W that has been subjected to the slit processing is rolled, and each of the unopened state is rolled. The slit 4a expands to form slits 4 and 5 having a predetermined width.
[0037]
A horizontal cross frame 29 is arranged between the pair of left and right side frames 21 and 21 in a bridging manner. A pair of left and right jig holders 31 are slidably mounted on the cross frame 29 via a linear guide 30. Each jig holder 31 has a gear-shaped chamfering jig via a vertical shaft and a bearing. 13 or 14 is rotatably mounted. As the coil material W passes between the pair of chamfering jigs 13 and 14, the chamfering jigs 13 and 14 roll while engaging with both end surfaces of the coil material W. As described above, the corner edges 2a (see FIG. 4) at both ends of each bone fragment 2, 2,... Are chamfered.
[0038]
In addition, on one of the side frames 21 described above, adjust screws 33 and 34 each having a lock nut 32 independent of each of the chamfering jigs 13 and 14 are provided side by side. The external thread of one adjusting screw 33 is on the jig holder 31 on the one chamfering jig 14 side, and the external screw of the other adjusting screw 34 is on the one jig holder 31 or below. After being passed through the roller holder 35 to be adjusted, it is screwed into the jig holder 31 on the other chamfering jig 13 side, and the coil material W is chamfered in the width direction according to the rotating operation of the adjusting screws 33 and 34. The positions of the jigs 13 and 14 can be adjusted independently. That is, the positions of the chamfering jigs 13 and 14 in the width direction of the coil material W can be adjusted, and at the same time, the distance between the axes of the chamfering jigs 13 and 14 can be adjusted.
[0039]
As shown in FIG. 8, a roller holder 35 is provided upright between the jig holders 31 in the cross frame 29, and the roller holder 35 has left and right sides about a horizontal axis as a center of rotation. A pair of rotatable lower holding rollers 36 are disposed so as to be located in the gap between the chamfering jigs 13 and 14 facing each other. The uppermost surfaces of the lower pressing rollers 36 are set so as to substantially coincide with the upper surfaces of the table plates 23 and 24, and serve to press and restrain both ends of the coil material W together with the upper pressing roller 39 described later. .
[0040]
On the other hand, on the upper surfaces of the pair of side frames 21, as shown in FIG. 8, a substantially cross-shaped upper beam 37 is arranged in a bridging manner. At the center of the upper beam 37, a bar-shaped slider 38 is supported so as to be vertically movable, and at the lower end of the slider 38, a pair of upper pressing rollers 39 facing the lower pressing roller 36 is rotated. It is provided as possible. Since the slider 38 is fixed to the upper beam 37 by a tightening screw 41 with a handle 40, the height of the upper holding roller 39 is adjusted by releasing the tightening force by rotating the handle 40. 38 can be adjusted. At the upper end of the slider 38, an adjust screw 42 for finely adjusting the height position of the slider 38 is provided.
[0041]
More specifically, FIGS. 5 and 8 show a state in which the upper pressing roller 39 is raised together with the slider 38. However, when the coil material W is processed, the lower pressing roller 36 and the upper pressing roller 39 separate the coil material W. The height position of the slider 38 is adjusted in advance so that the upper pressing roller 39 is pressed against the coil material W so that the pressure can be effectively restrained.
[0042]
Therefore, according to this processing unit 20, the coil material W slitted by the slitter rollers 6, 7 shown in FIGS. Since the coil material W is introduced, the rolling process of the bridge portion 3, the chamfering process of the corner edge portion 2a of each of the bone fragments 2, 2,... Is performed.
[0043]
That is, when the coil material W passes between the pair of upper and lower rolling rollers 11, 12, the rolling rollers 11, 12 rotate synchronously in response to the feed of the coil material W itself. The bridge portion 3 of the coil material W is rolled by the annular protrusion 11 a attached to the upper rolling roller 11. As a result, the slit 4a, which has not been expanded, expands to slits 4, 5 having a predetermined width, and the bone fragments 2, 2,... It is shaped like a ladder.
[0044]
When the coil material W passes through the pair of rolling rollers 11 and 12, both end surfaces of the coil material W immediately mesh with the subsequent chamfering jigs 13 and 14, and each chamfer is formed according to the traveling of the coil material W itself. As the jigs 13 and 14 roll, plastic working is performed on the corner edge portions 2a at both ends of each of the bone fragments 2, 2,... In a relationship similar to the creation motion of the involute tooth profile by the reference rack tooth profile as shown in FIG. Is chamfered. At this time, since the nearest position of the part of the coil material W which is engaged with the chamfering jigs 13 and 14 is pressurized and restrained by the upper and lower pressing rollers 36 and 39, the pressing force of the chamfering jigs 13 and 14 is reduced. .. Are not deformed and the chamfering process is performed stably.
[0045]
Then, the coil material W released from the engagement with the chamfering jigs 13 and 14 is immediately sent between the pair of straightening rollers a15 and 16 in the subsequent stage, and is processed for flattening, that is, the first slit processing. And the distortion etc. which occurred at the time of rolling process and chamfering process will be removed.
[0046]
Here, as described above, the pair of upper and lower rolling rollers 11 and 12 and the straightening rollers 15 and 16 can adjust the distance between their axes and the like. Since it is possible to cope with the processing of W, and also to adjust the positions of the chamfering jigs 13 and 14 and the distance between the axes, it is possible to cope with the processing of a plurality of types of coil materials W in the same manner as described above. However, when processing the coil material W in which the distance between the bone fragments 2 and 2 is greatly different, it is necessary to replace the chamfering jigs 13 and 14 themselves.
[Brief description of the drawings]
FIG. 1 is a schematic plan view showing a preferred embodiment of the present invention.
FIG. 2 is a schematic side view of FIG. 1;
FIG. 3 is an explanatory plan view of a main part showing an example of a welt core manufactured by the present invention.
FIG. 4 is an enlarged explanatory view of a main part during chamfering.
FIG. 5 is an explanatory side view of a processing unit that embodies the configuration of FIGS. 1 and 2;
FIG. 6 is an explanatory plan view of FIG. 5;
FIG. 7 is an enlarged view of a main part of FIG. 6;
FIG. 8 is an explanatory sectional view taken along line AA of FIG. 5;
[Explanation of symbols]
1. Core for welt
2. Bone fragments
2a: Corner edge
3. Bridge part
4 ... Slit
4a: Unexpanded slit
5 ... Slit
6. Slitter roller
7. Slitter roller
11 Rolling roller
12 ... Rolling roller
13 ... Chamfering jig
14 ... Chamfering jig
15 ... Straightening roller
16 ... Straightening roller
17 ... Chamfered tooth
W: coil material

Claims (4)

A method of manufacturing a ladder-shaped welt core metal as if a large number of parallel strip-shaped bone pieces were connected to each other at a bridge portion partially left therebetween,
A slit process is performed on a long coil material as a raw material by a slitter roller, and a linear and unexpanded slit extending in the width direction of the coil material except for a portion to be the bridge portion is formed at a predetermined pitch. Forming,
A step of rolling the bridge portion with a rolling roller following the slitting process, extending the slit, separating the bone fragments from each other in a portion other than the bridge portion, and extending and forming a substantially ladder shape as a whole. ,
Following the rolling, a step of applying a gear-shaped chamfering jig to both ends in the width direction of the coil material and chamfering a corner edge portion of each bone fragment,
Containing
In the chamfering step, the chamfering jig is engaged with slits at both ends in the width direction of the coil material, and the two are relatively moved, thereby performing a chamfering process in a round chamfering shape on a corner edge portion of each bone fragment. Manufacturing method of core metal. The welt according to claim 1, wherein the coil material is continuously fed in a longitudinal direction thereof, and the chamfering jig rotates as if driven by the feeding operation of the coil material itself. Manufacturing method of core metal. The method for producing a welt core according to claim 1 , further comprising a step of correcting the coil material by applying a pressing force to the coil material in a sheet thickness direction with a correcting roller after the chamfering process. It is an apparatus for manufacturing a ladder-shaped welt core metal as if a large number of parallel strip-shaped bone pieces were connected to each other at a bridge portion partially left between them.
A long coil material as a material to which continuous feeding is given is applied in the plate thickness direction, and a linear and unexpanded slit extending in the width direction of the coil material except for a portion to be the bridge portion is predetermined. A slitter roller formed at a pitch of
Provided on the subsequent stage of the slitter roller, the bridge portion of the coil material after the slit processing is subjected to a rolling process, and while expanding the slit, the bone fragments are separated from each other at a portion other than the bridge portion, thereby forming a substantially ladder as a whole. A rolling roller that extends and forms
A gear-shaped chamfer that is provided at the subsequent stage of the rolling roller and performs round chamfering at the corner edge portion of each bone fragment by relatively moving while engaging with slits at both ends in the width direction of the coil material after rolling. Jig and
A straightening roller which is provided at a subsequent stage of the chamfering jig and corrects the coil material after the chamfering process by applying a pressure in a sheet thickness direction.
An apparatus for manufacturing a welt core, comprising:

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