JP5448712B2 - The groove of the roller weld - Google Patents

Description

  The present invention relates to a groove of a welding point, for example, a groove of a welding point in a roller used in an endless track construction machine such as a bulldozer or a hydraulic excavator.

The flowchart of FIG. 5 shows a manufacturing process of a roller used in an endless track construction machine.
In FIG. 5, in the first step S <b> 1, a roller forging material is manufactured, and the manufactured forging material is indicated by a symbol F in FIG. 6. In FIG. 6, a two-dot chain line indicates a shape to be formed by machining described later. Moreover, the code | symbol Ff in FIG. 6 has shown the flange-shaped part (flange part) formed in the both ends of a roller.
In the second step S2 of FIG. 5, end surface processing (rough processing) is performed on the forging material F along the two-dot chain line of FIG. FIG. 7 shows a state in which such end face processing is performed. FIG. 7 shows a state in which the end portion Fe (the end portion on the opposite side to the flange portion Ff: the right end portion in FIG. 7) is roughly processed.

In the third step S3 of FIG. 5, the two forging materials F that have been subjected to the end surface processing in the step S2 are set so that the processing surfaces are in contact with each other as shown in FIG. To do. The welding part is the groove part C in FIG. 8, and the groove part C constitutes a welding groove.
In FIG. 8, the symbol W indicates a weld bead. Reference numeral 10W denotes a work (roller) in which two forging materials F are welded.

In the 4th process S4 of Drawing 5, the roller welded and joined by process S3 is heat-treated (for example, water quenching). Then, in the fifth step S5 of FIG. 5, the scale and the like are removed from the heat-treated roller.
In addition, about the detail of process S4, S5, illustration is abbreviate | omitted.

In the sixth step S6 in FIG. 5, machining is performed on the roller 10W from which the scale and the like have been removed in step S5. For example, as shown in FIGS. 8 and 9, the machining is cutting and / or grinding performed so that the inner peripheral surface of the roller 10W is indicated by a two-dot chain line with a cutting tool B2 such as a lathe.
In FIG. 9, the code | symbol G shows the chip which generate | occur | produced in the case of machining.
When the machining shown in step S6 and FIG. 9 is completed, the roller 10J is completed.

FIG. 10 shows an enlarged view of the welded part (A part) in FIG. As shown in FIG. 10, when two forging materials are brought into contact with each other and welded (step S3: FIG. 8) and subjected to heat treatment (step S4), a gap δ caused by thermal strain in the axial direction is formed on the inner peripheral side of the weld end. Occurs. Then, the chips G generated when machining in step S6 enters the gap δ.
Since the roller 10W is rotated at the time of machining, the centrifugal force acts on the chips G, and the chips G are further pushed into the inner part (the outer part in the roller radial direction) in the gap δ.

Although illustration is omitted, after the sixth step S6 of FIG. 5, the inner peripheral side 10E of the roller is cleaned by blowing away chips G or the like, for example, by jetting compressed air or the like.
However, even if such cleaning is achieved, the chips G that have entered the gap δ remain in the gap δ.

FIG. 11 shows a state where the roller shaft 20 is inserted through the completed roller 10J (roller assembly).
When the roller 10J is used while being mounted on a construction machine, if the chip G remains in the gap δ as described above, the chip G may be removed during use of the construction machine as shown in FIG. From δ, it enters between the shaft 20 and the bush 30. When the chips G enter between the shaft 20 and the bush 30, the chips G that enter between the shaft 20 and the bush 30 during the traveling of the construction machine cause heat generation.

As shown in FIG. 11, floating seals 40 are interposed at both ends in the axial direction of the roller 10J (left and right ends in FIG. 11), and the inner space 10E in the center of the roller 10J is lubricated with engine oil or the like. Filled with oil.
Here, since the floating seal 40 interposed at the axial end of the roller 10J is vulnerable to heat, the chips G enter between the shaft 20 and the bush 30 and the boundary region between the shaft 20 and the bush 30 If the heat is generated, the floating seal 40 is deteriorated, the sealing performance is lowered, and the lubricating oil may be leaked to the outside.

  Further, when the chips G enter between the shaft 20 and the bush 30, the chips G are in a so-called “biting” state between the shaft 20 and the bush 30, and the rotation of the roller is inhibited. Or there exists a possibility of producing the partial wear of the shaft 20. FIG.

Here, in FIG. 9 to FIG. 11, two forging materials F having the same shape are welded, but as shown in FIG. 12, the two forging materials F are male 1 whose joints protrude to the other side. And a female 2 that receives the protruding portion of the male side 1.
As shown in FIG. 12, in the groove C of the welded portion of the roller 11J divided into the male 1 and the female 2, the root groove 14 extends in the radial direction of the roller 11J (vertical direction in FIG. 12). Area 15 and an area 16 extending in the axial direction of the roller 11J (left and right in FIG. 12). A region 15 extending in the radial direction of the roller 11J is continuous with the internal space 11E of the roller 11J.
Therefore, also in the welding groove C of the roller 11J shown in FIG. 12, as in the case of FIGS. 9 to 11, a gap δ is generated in the region 15 extending in the radial direction, and the gap δ is subjected to machining. The chip G (not shown in FIG. 12) intrudes into the area and enters the same problem as described above.

As another conventional technique, a structure of a roller part for a construction machine that can be shared by construction machines of various companies has been proposed (see, for example, Patent Document 1).
However, in such a prior art (Patent Document 1), the purpose of the construction machine roller is to be shared by construction machine manufacturers, and foreign matter such as chips enter a groove in the root part of the welding point. It does not address the above-mentioned problems caused by it.

Also, a steel plate welding method and a butt welder in a butt welder have been proposed (see Patent Document 2).
However, the related art (Patent Document 2) proposes a steel plate welding method and a butt welder in a butt welder, and is caused by foreign matter such as chips entering a groove in a root portion of a weld point. However, this does not solve the above-mentioned problem.

JP 2004-230907 A JP-A-6-210492

  The present invention has been proposed in view of the above-described problems of the prior art, and foreign matter such as chips generated during the cutting process penetrates into the groove of the root portion at the welding location, causing heat generation and other problems. The purpose of this is to provide a groove at the welding point of the roller that can prevent adverse effects during product use.

  According to the present invention, the inner surface (10i) is machined after welding the male side (1) of the first roller and the female side (2) of the second roller, and the inner side of the male side (1) The end surface (101) on the male side (1) at the groove at the welding point of the roller in which the hollow portion (10E) is formed radially inward of the peripheral surface (1i) and the inner peripheral surface (2i) on the female side A first cylindrical outer peripheral surface (103) extending in the roller axial direction is formed in the radially outward direction of the first cylindrical outer peripheral surface (103). 101), an annular surface (105) is formed at the end opposite to the end, and the annular surface (105) extends outward in the radial direction. A surface (106) is formed extending in the axial direction, and is opposite to the first annular surface (105) of the second cylindrical outer peripheral surface (106). A conical surface (107) is formed at the end portion on the side, and the conical surface (107) is formed so as to move away from the second cylindrical outer peripheral surface (106) toward the outer side in the radial direction. ) And the inner peripheral surface (1i) of the male side (1) are chamfered (102), and extend radially inward of the end surface (205) of the female side (2) in the axial direction. A cylindrical inner peripheral surface (203) is formed, and the first conical surface (202) is continuously formed at the end opposite to the end surface (205) of the other inner peripheral surface (203). The first conical surface (202) is formed so as to move away from another inner peripheral surface (203) as it goes radially inward, and is continuous with the inner peripheral surface (2i) on the female side (2). And a cylindrical outer peripheral surface (axially extending continuously in the axial direction) on the radially outer side of the end surface (205). 06) is formed, and a second conical surface (207) is continuously formed at the end of the cylindrical outer peripheral surface (206) opposite to the end surface (205), and the second conical surface ( 207) extends away from the cylindrical outer peripheral surface (206) as it goes outward in the radial direction, and extends to the first cylindrical outer peripheral surface (103) on the male side (1) on the female side (103). 2) another inner peripheral surface (203) is fitted, the male side (1) conical surface (107), the second cylindrical outer peripheral surface (106) and the female outer side (2) cylindrical outer peripheral surface ( 206) and the second conical surface (207) form a weld (W) groove.

According to the present invention having the above-described configuration, the groove (4) of the root portion in the groove (3) of the welding portion of the roller (10) has the region (6) extending in the roller axial direction. The region (6) extending in the roller axial direction is continuous with the hollow portion (10E) inside the roller.
That is, the region (6) continuous to the hollow portion (10E) in the groove (4) of the root portion extends in the axial direction of the roller (10), and the chips ( G) is perpendicular to the direction in which the centrifugal force acts on the foreign matter (the radial direction of the roller 10).

For this reason, after the roller (10) is welded and then subjected to heat treatment, machining is performed, and when foreign matter such as chips generated by machining is present in the hollow portion (10E) of the roller, it is caused by machining. Even if centrifugal force acts on foreign matter such as chips, the possibility of being pushed into the region (6) continuous with the hollow portion (10E) in the groove (4) of the root portion is extremely low.
Then, foreign matter such as chips generated by machining is prevented from entering the groove (4) of the root part, and when the manufactured roller (10) is used, the groove (4) of the root part is used. The inconvenience that foreign matter such as entering chips (G) comes out of the groove (4) in the root portion and enters between the roller (10) and the shaft (20) is prevented.

In addition, according to the present invention, foreign matter such as chips (G) is prevented from entering between the roller (10) and the shaft (20), and therefore, between the roller (10) and the shaft (20). , Deterioration of a seal (for example, floating seal 40: see FIG. 11) accompanying the heat generation, leakage of the lubricant, and the like are also prevented.
Furthermore, the problem of uneven wear of the shaft (20) is also prevented.

In the present invention, if the male side (1) of the roller (10) is fitted to the female side (2) (Claim 3), and is particularly fit, the groove (4) in the root portion is disconnected. Since the area is very small, foreign matters such as chips generated by machining are less likely to enter the root groove (4), which is preferable.
In particular, the region (5) extending in the radial direction of the roller in the groove (4) in the root portion is completely melted during welding, and the possibility that the groove in the region (5) itself disappears increases.

Furthermore, according to the present invention, it is not necessary to significantly change the shape of the welded portion (joining portion) on the male side (1) and the female side (2) of the roller (10) as compared with the conventional shape, Significant changes to existing welding equipment and welding procedures are unnecessary.
Therefore, it becomes extremely easy to implement the present invention by changing the groove of the welding portion of the conventional roller.

It is sectional drawing of the roller assembly which has the groove of the welding location which concerns on embodiment of this invention. It is an expanded sectional view of the groove of the welding location in FIG. It is an expanded sectional view of the edge part in the male side forge material in an embodiment. It is sectional drawing of the edge part in the forge raw material by the side of the knife in embodiment. It is a flowchart explaining the manufacturing process of a roller. It is a figure explaining the manufacturing process of the forge raw material in FIG. It is a figure explaining the cutting process of the forge raw material edge part in FIG. It is a figure explaining the welding process of the junction part in FIG. It is a figure explaining the machining process in FIG. It is a figure which shows the state which the chip | tip invaded in the clearance gap between welding parts. It is a figure which shows the roller assembly which has the groove of the welding part which concerns on a prior art. In prior art, it is a figure which shows the groove of the welding location of a shape different from FIGS. 9-11.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
FIG. 1 shows a roller 10 (roller assembly) having a groove at a welding point according to the embodiment, and a shaft 20 is inserted into the roller 10.
In FIG. 1, a roller 10 includes an end 1e (right end in FIG. 1) of a male forging material (male member) 1 and an end 2e of a female forging member (female member) 2 (FIG. 1). Are integrated by welding W.

The male member 1 is a member on the side having a portion in which a part of the end portion to be joined at the time of welding protrudes to the other (female member 2), and the female member 2 includes the protruding portion of the male member 1. It is a member on the receiving side.
Further, the end 1 e of the male member 1 is an end opposite to the flange 1 f of the male member 1, and the end 2 e of the female member 2 is an end opposite to the flange 2 f of the female member 2. .

A pair of bushes 30 are interposed on the machined inner peripheral surface 10 i of the roller 10, and floating seals 40 are interposed at both ends in the axial direction of the roller 10. In FIG. 1, the arrangement of the roller 10, the shaft 20, the bush 30 and the floating seal 40 is the same as that shown in FIG.
In FIG. 1, a hollow portion inside the roller surrounded by the inner periphery 1 i of the male mold 1, the inner periphery 2 i of the female mold 2 and the shaft 20 at the center of the roller 10 is indicated by reference numeral 10E.

In FIG. 1, the weld joint location is indicated by the symbol A, and in FIG. 2, the weld joint location A is shown in an enlarged manner. The weld joint portion A includes a groove 3 for weld joint between the male member 1 and the female member 2.
The male member 1 and the female member 2 before welding and joining will be described with reference to FIGS. 3 and 4, respectively.

An end 101 shown in FIG. 3 is an end opposite to the flange 1f in FIG.
In FIG. 3, the end surface 101 extends in the roller radial direction (in FIG. 3, the vertical direction: hereinafter referred to as “radial direction”). A first cylindrical outer peripheral surface 103 is formed on the outer side in the radial direction of the end surface 101 and extends in the roller axial direction (left and right direction in FIG. 3; hereinafter referred to as “axial direction”) continuously to the end surface 101. ing.
A chamfering process 102 is applied to a boundary portion between the end surface 101 and the inner peripheral surface 1 i of the male member 1.

In the first cylindrical outer peripheral surface 103, an annular surface 105 is formed at the end opposite to the end surface 101 (left side in FIG. 3) via a corner rounded portion 104. The surface 105 extends radially outward. Here, instead of the corner rounded portion 104, chamfering (not shown) may be performed.
A second cylindrical outer peripheral surface 106 is formed to extend in the axial direction at the radially outer end of the first annular surface 105 so as to be continuous with the annular surface 105.

At the end of the second cylindrical outer peripheral surface 106 opposite to the first annular surface 105 (left side in FIG. 3), the conical surface 107 is continuous with the second cylindrical outer peripheral surface 106. Is formed.
The conical surface 107 is formed so as to move away from the second cylindrical outer peripheral surface 106 as it goes radially outward (extends to the upper left in FIG. 3).

A third cylindrical outer peripheral surface 108 is continuously formed on the outer side in the radial direction of the conical surface 107.
At the end of the third cylindrical outer peripheral surface 108 opposite to the conical surface 107 (the left side in FIG. 3), a second annular ring extending radially outward via a corner rounded portion 109. A surface 110 is formed.
The second annular surface 110 is orthogonal to the outer peripheral surface 1 o of the male member 1.

In FIG. 4, the female member 2 has an end face 205. The end face 205 is formed on the side opposite to the flange portion 2f shown in FIG.
On the inner side (lower side in FIG. 4) of the end face 205 in the radial direction (vertical direction in FIG. 4; hereinafter referred to as “radial direction”), the roller shaft direction (left and right direction in FIG. A cylindrical inner peripheral surface 203 extending in the “axial direction”) is formed.
The corner radius portion 204 has a larger radius of curvature than the corner radius portion 104 (see FIG. 3) of the male member 1.
Here, a chamfer may be applied to the boundary portion between the end surface 205 and the inner peripheral surface 203 instead of the corner rounded portion 204. In that case, the boundary between the first cylindrical outer peripheral surface 103 and the annular surface 105 in FIG. 3 is also chamfered (not shown) instead of the rounded portion 104, and the boundary between the end surface 205 and the inner peripheral surface 203 in FIG. The chamfering of the portion is set larger than the chamfering of the boundary portion between the first cylindrical outer peripheral surface 103 and the annular surface 105 in FIG.

A first conical surface 202 is formed continuously from the inner peripheral surface 203 at an end of the inner peripheral surface 203 in FIG. 4 opposite to the end surface 205 (right side in FIG. 4). Is extended away from the inner peripheral surface 203 as it goes inward in the radial direction (in FIG. 4, it extends in the lower left direction).
The first conical surface 202 is continuous with the inner peripheral surface 2 i of the female member 2.

On the outer side in the roller radial direction of the end surface 205 (upper side in FIG. 4), a first cylindrical outer peripheral surface 206 extending in the axial direction is formed continuously with the end surface 205.
A second conical surface 207 is formed at the end of the first cylindrical outer peripheral surface 206 opposite to the end surface 205 (on the right side in FIG. 4), continuously from the first cylindrical outer peripheral surface 206. Yes. The second conical surface 207 extends away from the first cylindrical outer peripheral surface 206 as it goes outward in the radial direction (extends to the upper right in FIG. 4).

A second cylindrical outer peripheral surface 208 is formed continuously to the second conical surface 207 on the radially outer side (upper right side in FIG. 4) of the second conical surface 207.
The second cylindrical outer peripheral surface 208 extends in the axial direction, and at the end opposite to the second conical surface 207 (on the right side in FIG. 4) via a corner rounded portion 209, An annular surface 210 extending outward in the radial direction is formed.
The annular surface 210 is orthogonal to the outer peripheral surface 2 o of the female member 2.

In FIG. 2, a groove 3 at a welding portion where the male member 1 and the female member 2 of the roller 10 are welded and a groove 4 at a root portion extending from the groove 3 is shown.
Although not clearly shown, in FIG. 2, the columnar outer peripheral surface 103 (see FIG. 3) of the male member 1 is fitted to the inner peripheral surface 203 (see FIG. 4) of the female member 2 prior to welding. Has been.
However, when the columnar outer peripheral surface 103 of the male member 1 is fitted to the inner peripheral surface 203 of the female member 2, the presence or absence of interference (interference) is not specified.

  Referring to FIGS. 2 to 4, the groove 3 (FIG. 2) of the welding point includes a second cylindrical outer peripheral surface 106 (FIG. 3) of the male member 1 and a conical surface 107 (FIG. 3) of the male member. And a first cylindrical outer peripheral surface 206 (FIG. 4) of the female member 2 and a second conical surface 207 (FIG. 4) of the female member.

A groove 4 in the root portion is connected to the groove 3 (FIG. 2) of the welded portion. The groove 4 in the root portion has a region 5 extending in the radial direction and a region 6 extending in the axial direction.
The region 5 extending in the radial direction is continuous with the welded portion (weld bead) W, and the region 6 extending in the axial direction is continuous with the hollow portion 10E inside the roller.

The region 5 (FIG. 2) extending in the roller radial direction is a region where the first annular surface 105 (FIG. 3) of the male member 1 and the end surface 205 (FIG. 4) of the female member 2 are joined. is there.
In the region 6 (FIG. 2) extending in the roller axis direction, the first cylindrical outer peripheral surface 103 (FIG. 3) of the male member 1 is fitted (clearance) to the inner peripheral surface 203 (FIG. 4) of the female member 2. This is an area that is fit, intermediate fit, and fit.
In FIG. 2, in the region 7 that connects the region 5 and the region 6, the corner radius portion 104 (FIG. 3) in the male member 1 and the corner radius portion 204 (FIG. 3) in the female member 2 overlap. It is an area.

According to the illustrated embodiment, as shown in FIG. 2, the region 6 extending in the axial direction in the groove 4 of the root portion is continuous with the hollow portion 10E inside the roller. Therefore, even if foreign matter such as chips generated by machining exists in the hollow portion 10E, the centrifugal force acting on the foreign matter due to the rotation of the roller 10 acts in the radial direction of the roller 10, whereas the root portion A region 6 continuing to the hollow portion in the groove 4 extends in the axial direction and is orthogonal to the direction in which centrifugal force acts on the foreign matter.
Therefore, the possibility that the foreign matter to which the centrifugal force acts is pushed into the region 6 continuous with the hollow portion 10E in the groove 4 of the root portion is extremely low.
As a result, foreign matter such as chips generated by machining is prevented from entering the groove 4 in the root portion, and when the manufactured roller 10 is used, the foreign matter is caused between the roller 10 and the shaft 20. Problems caused by intrusion in the meantime are prevented.

In the embodiment of FIGS. 1 to 4, if the male member 1 is fitted (particularly fit) to the female member 2, welding (S 3 in FIG. 5) and heat treatment (S 4 in FIG. 5) are performed. After the application, the groove 4 in the root portion becomes very small, and it is preferable that foreign matters such as chips generated by machining hardly enter the groove 4 in the root portion.
In particular, the region 5 extending in the radial direction in the groove 4 in the root portion is completely melted during welding, and the possibility that the groove in the region 5 disappears becomes high.
In addition, even when the male member 1 is intermediate-fitted or fit-fitted to the female member 2, the effect that the groove 4 in the root portion becomes very small can be expected.

Furthermore, according to the illustrated embodiment, it is not necessary to significantly change the shape of the welded portion (joint part) of the male member 1 and the female member 2 as compared with the conventional shape, so that existing welding equipment and welding Significant changes to procedures are not required.
Therefore, it becomes extremely easy to implement the present invention from the viewpoints of cost and the like.

It should be noted that the illustrated embodiment is merely an example, and is not a description to limit the technical scope of the present invention.
The present invention is applicable to all products subjected to post-weld heat treatment.

DESCRIPTION OF SYMBOLS 1 ... Male member 2 ... Female member 3 ... Groove 4 ... Groove 5 of root part ... Area | region extended to roller radial direction 6 ... Area | region extended to roller axial direction 7 ... Area 10 connecting the area 5 and the area 6 ... Roller 20 ... Shaft 30 ... Bushing 40 ... Floating seal

Claims (1)

After the male side (1) of the first roller and the female side (2) of the second roller are welded, the inner surface (10i) is machined, and the inner peripheral surface (1i) of the male side (1) In the groove at the welding point of the roller in which the hollow portion (10E) is formed radially inward with the inner peripheral surface (2i) on the female side, radially outward of the end surface (101) on the male side (1) Is formed with a first cylindrical outer peripheral surface (103) extending continuously in the roller axis direction on the end surface (101), and opposite to the end surface (101) of the first cylindrical outer peripheral surface (103). An annular surface (105) is formed at the end of the cylindrical surface, the annular surface (105) extends radially outward, and the second cylindrical outer peripheral surface (106) is continuously connected to the end. Formed at the end of the second cylindrical outer peripheral surface (106) opposite to the first annular surface (105). A surface (107) is formed, and the conical surface (107) is formed so as to move away from the second cylindrical outer peripheral surface (106) as it goes radially outward, and the end surface (101) and the male side (1) The inner peripheral surface (1i) is chamfered (102) at the boundary with the inner peripheral surface (1i), and the inner end surface (205) on the female side (2) is radially inwardly separated from another cylindrical inner portion extending in the axial direction. A peripheral surface (203) is formed, and a first conical surface (202) is continuously formed at the end of the other inner peripheral surface (203) opposite to the end surface (205). The conical surface (202) is formed so as to move away from another inner peripheral surface (203) as it goes radially inward, and is continuous with the inner peripheral surface (2i) on the female side (2). 205), a cylindrical outer peripheral surface (206) extending in the axial direction is formed on the outer side in the radial direction. A second conical surface (207) is continuously formed at the end of the cylindrical outer peripheral surface (206) opposite to the end surface (205), and the second conical surface (207) has a radius As it goes outward in the direction, it extends away from the cylindrical outer peripheral surface (206), and the first cylindrical outer peripheral surface (103) on the male side (1) The inner peripheral surface (203) is fitted, the male side (1) conical surface (107) and the second cylindrical outer peripheral surface (106), and the female side (2) cylindrical outer peripheral surface (206) and the second. The conical surface (207) of the roller forms a groove for welding (W), the groove at the welding point of the roller.

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