CN112276474B - Method for assembling shaft hole - Google Patents
Method for assembling shaft hole Download PDFInfo
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- CN112276474B CN112276474B CN202010896925.4A CN202010896925A CN112276474B CN 112276474 B CN112276474 B CN 112276474B CN 202010896925 A CN202010896925 A CN 202010896925A CN 112276474 B CN112276474 B CN 112276474B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for
- B23P11/02—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits
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Abstract
The disclosure provides an assembling method of a shaft hole, and belongs to the field of mechanical assembly. The assembling method comprises the following steps: providing a mandrel, wherein the mandrel comprises a shaft shoulder, a first matching shaft section and a second matching shaft section which are coaxially connected together, and the shaft shoulder is coaxially connected to the outer peripheral wall of the first matching shaft section and is far away from the second matching shaft section; providing the winding drum, wherein the winding drum comprises a first matching shaft hole and a second matching shaft hole which are coaxially arranged, and the minimum interference magnitude between the first matching shaft hole and the first matching shaft section is larger than the maximum interference magnitude between the second matching shaft hole and the second matching shaft section; heating the reel; inserting the mandrel into the winding drum, so that the shaft shoulder is abutted against the end part of the first matching shaft hole, the first matching shaft section is positioned in the first matching shaft hole, and the second matching shaft section is positioned in the second matching shaft hole; the web is cooled. The axial assembling precision of the shaft and the hole during hot assembly can be guaranteed.
Description
Technical Field
The disclosure belongs to the field of mechanical assembly, and particularly relates to an assembling method of a shaft hole.
Background
The assembly between the shaft and the hole is a common assembly mode in the field of mechanical assembly.
There is a jumbo reel assembly which involves the assembly between the reel and the mandrel. Because interference fit between reel and the dabber, and the interference magnitude is great, so need adopt the assembly methods of hot charging. The hot-assembling means that the reel is heated by using the principle of expansion with heat and contraction with cold, so that the aperture in the reel is enlarged, and the mandrel is conveniently inserted. After the mandrel is inserted, the mandrel cools, allowing the bore in the mandrel to recover, completing the assembly between the mandrel and the mandrel.
However, in the process of cooling the winding drum, not only the aperture of the winding drum will be reduced, but also the axial length of the winding drum will be reduced, so that the axial spacing between the winding drum and the mandrel will be loosened, and further the axial assembly precision between the winding drum and the mandrel will be affected.
Disclosure of Invention
The embodiment of the disclosure provides an assembling method of a shaft hole, which can ensure the axial assembling precision of the shaft and the shaft hole during hot assembly. The technical scheme is as follows:
the embodiment of the disclosure provides an assembling method of a shaft hole, which comprises the following steps:
providing a mandrel, wherein the mandrel comprises a shoulder, a first matching shaft section and a second matching shaft section which are coaxially connected together, and the shoulder is coaxially connected to the outer peripheral wall of the first matching shaft section and is far away from the second matching shaft section;
providing a winding drum, wherein the winding drum comprises a first matching shaft hole and a second matching shaft hole which are coaxially arranged, and the minimum interference magnitude between the first matching shaft hole and the first matching shaft section is larger than the maximum interference magnitude between the second matching shaft hole and the second matching shaft section;
heating the web;
inserting the mandrel into the winding drum, so that the shaft shoulder abuts against the end part of the first matching shaft hole, the first matching shaft section is located in the first matching shaft hole, and the second matching shaft section is located in the second matching shaft hole;
cooling the web.
Further, a minimum interference between the first mating shaft hole and the first mating shaft section is greater than a maximum interference between the second mating shaft hole and the second mating shaft section, and the method includes:
the fit tolerance between the first fit shaft hole and the first fit shaft section is H8/p7, and the fit tolerance between the second fit shaft hole and the second fit shaft section is H8/k 7.
Further, the providing a spool includes:
and lengthening the hole length of the second matching shaft hole to ensure that the hole length of the second matching shaft hole is 3-7mm longer than that of the first matching shaft hole.
Further, the providing the reel further includes:
and increasing the aperture of the first matching shaft hole, so that the aperture of the first matching shaft hole is 3-7mm larger than that of the second matching shaft hole.
Further, before the heating the reel, the assembling method includes:
will the reel is vertical to be placed, make first cooperation shaft hole with the perpendicular horizontal plane in second cooperation shaft hole, just first cooperation shaft hole is located the top in second cooperation shaft hole.
Further, the placing the reel vertically comprises:
providing a bracket;
resting the reel on the stand.
Further, the inserting the mandrel into the reel comprises:
hoisting the mandrel so that the first mating shaft section is positioned above the second mating shaft section;
aligning the second matching shaft section with the first matching shaft hole, and lowering the mandrel.
Further, after the inserting the mandrel into the reel, the assembling method further comprises:
providing a weight;
placing the weight on the end of the first mating shaft segment away from the second mating shaft segment so that the direction of gravity of the weight is the same as the axial direction of the first mating shaft segment.
Further, the providing a weight includes:
such that the weight force is greater than the maximum friction force between the first mating shaft segment and the first mating shaft aperture.
Further, the placing the weight on an end of the first mating shaft segment distal from the second mating shaft segment includes:
placing the weight before the friction between the first mating shaft segment and the first mating shaft bore is maximized.
The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:
when the mandrel and the winding drum are assembled by the assembling method of the shaft hole provided by the embodiment of the disclosure, firstly, the required mandrel and the required winding drum are provided. Then, the winding drum is heated, and the principle of expansion with heat and contraction with cold is utilized, so that the aperture of the first matching shaft hole and the aperture of the second matching shaft hole are enlarged, and the mandrel can be conveniently inserted in the subsequent steps. Then, the mandrel is inserted into the winding drum, so that the shaft shoulder is abutted to the end part of the first matching shaft hole, the first matching shaft section is located in the first matching shaft hole, the second matching shaft section is located in the second matching shaft hole, and the mandrel and the winding drum are assembled in place. And finally, cooling the winding drum, and utilizing the principle of cold expansion and cold contraction to reduce the aperture of the first matching shaft hole and the second matching shaft hole so as to clamp the mandrel in the winding drum. Because the minimum interference magnitude between the first matching shaft hole and the first matching shaft section is larger than the maximum interference magnitude between the second matching shaft hole and the second matching shaft section, the first matching shaft hole is firstly shrunk in place in the cooling process, namely, the first matching shaft hole and the first matching shaft section are firstly positioned and fixed. And the second cooperation shaft hole then continues to contract, and in this in-process, the axial position and the radial position between first cooperation shaft hole and the first cooperation shaft section are all no longer changed, and the location of shaft shoulder also does not receive the influence. And then, the second matching shaft hole is also contracted in place, namely, the second matching shaft hole and the second matching shaft section are positioned and fixed, so that all assembly work between the mandrel and the winding drum is completed.
That is to say, through the first cooperation shaft hole that is close to the shaft shoulder and the preceding location of first cooperation shaft section for subsequent cooling shrink process can not influence the axial positioning of shaft shoulder, has guaranteed the axial assembly precision of dabber and reel when the hot-assembling.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a cross-sectional view of a jumbo reel assembly provided by an embodiment of the present disclosure;
FIG. 2 is a flow chart of a method of assembling a shaft hole provided by an embodiment of the present disclosure;
FIG. 3 is a schematic structural view of a mandrel provided by an embodiment of the present disclosure;
FIG. 4 is a cross-sectional view of a spool provided by an embodiment of the present disclosure;
FIG. 5 illustrates another method of assembling a shaft hole provided in accordance with an embodiment of the present disclosure;
FIG. 6 is a schematic view of the placement of a spool provided by an embodiment of the present disclosure;
FIG. 7 is a schematic illustration of an assembly process provided by an embodiment of the present disclosure;
fig. 8 is a schematic view of an assembly process provided by an embodiment of the present disclosure.
The symbols in the drawings represent the following meanings:
100. a mandrel; 110. a shaft shoulder; 120. a first mating shaft section; 130. a second mating shaft section; 140. lifting lugs;
200. a reel; 210. a first mating shaft hole; 220. a second mating shaft hole;
300. a support;
400. and (5) a heavy object.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
There is a jumbo reel 200 assembly, fig. 1 is a cross-sectional view of the jumbo reel 200 assembly, referring to fig. 1, which mainly comprises a mandrel 100 and a reel 200, wherein the mandrel 100 is coaxially inserted into the reel 200, and the mandrel 100 and the reel 200 are in transition fit or interference fit. The length of the winding drum 200 is 7000mm, and the inner diameter of the shaft hole for accommodating the mandrel 100 in the winding drum 200 is 1020 mm.
Due to the transition fit or interference fit between the mandrel 100 and the winding drum 200, and the interference is large, the assembly method of hot-fitting is required. Shrink fitting refers to using the principle of expansion and contraction with heat to heat the winding drum 200, so that the aperture in the winding drum 200 is enlarged to facilitate the insertion of the mandrel 100. After the mandrel 100 is inserted, the mandrel 200 is cooled such that the bore in the mandrel 200 is restored to complete the assembly between the mandrel 100 and the mandrel 200.
However, during the cooling process of the winding drum 200, not only the bore diameter but also the axial length of the winding drum 200 becomes smaller, which results in the loosening of the axial spacing between the winding drum 200 and the mandrel 100, and further results in the influence on the axial assembly precision between the winding drum 200 and the mandrel 100.
In order to solve the above problem, an embodiment of the present disclosure provides an assembling method of a shaft hole, where fig. 2 is a flowchart of the assembling method, and as shown in fig. 2, the assembling method includes:
step 201: a mandrel 100 (see fig. 3) is provided, the mandrel 100 being the mandrel 100 to be assembled. This dabber 100 includes shoulder 110, first cooperation shaft section 120 and second cooperation shaft section 130 of coaxial coupling together, and shoulder 110 coaxial coupling is on the periphery wall of first cooperation shaft section 120, and keeps away from second cooperation shaft section 130.
Step 202: a reel 200 (see fig. 4) is provided, the reel 200 being the reel 200 to be assembled. The winding drum 200 includes a first mating shaft hole 210 and a second mating shaft hole 220, which are coaxially arranged, and a minimum interference between the first mating shaft hole 210 and the first mating shaft section 120 is greater than a maximum interference between the second mating shaft hole 220 and the second mating shaft section 130.
Step 203: the roll 200 is heated.
Step 204: the mandrel 100 is inserted into the mandrel 200 such that the shoulder 110 abuts an end of a first mating axial bore 210, the first mating axial segment 120 is located in the first mating axial bore 210, and the second mating axial segment 130 is located in the second mating axial bore 220.
Step 205: the spool 200 is cooled.
When the mandrel 100 and the winding drum 200 are assembled by the method for assembling the shaft hole provided by the embodiment of the present disclosure, first, the required mandrel 100 and winding drum 200 are provided. Then, the reel 200 is heated, and the hole diameters of the first and second fitting shaft holes 210 and 220 are expanded by using the principle of expansion with heat and contraction with cold, so as to facilitate the insertion of the mandrel 100 in the subsequent step. Next, the mandrel 100 is inserted into the mandrel 200 such that the shoulder 110 abuts the end of the first mating shaft hole 210, the first mating shaft segment 120 is located in the first mating shaft hole 210, and the second mating shaft segment 130 is located in the second mating shaft hole 220, i.e., the mandrel 100 and the mandrel 200 are assembled in place. Finally, the mandrel 200 is cooled, and the first and second matching shaft holes 210 and 220 are reduced in diameter by the cold expansion and cold contraction principle, so as to clamp the mandrel 100 in the mandrel 200. Since the minimum interference magnitude between the first matching shaft hole 210 and the first matching shaft section 120 is greater than the maximum interference magnitude between the second matching shaft hole 220 and the second matching shaft section 130, the first matching shaft hole 210 is firstly shrunk in place in the cooling process, that is, the first matching shaft hole 210 and the first matching shaft section 120 are firstly positioned and fixed. While the second mating axial bore 220 continues to contract, the axial and radial positions between the first mating axial bore 210 and the first mating shaft segment 120 do not change, and the positioning of the shoulder 110 is not affected. Subsequently, the second matching shaft hole 220 is also shrunk into place, i.e. the positioning and fixing are completed after the second matching shaft hole 220 and the second matching shaft section 130, thereby completing the whole assembly work between the mandrel 100 and the winding drum 200.
That is, by the advanced positioning of the first matching shaft hole 210 and the first matching shaft section 120 close to the shaft shoulder 110, the subsequent cooling shrinkage process does not affect the axial positioning of the shaft shoulder 110, and the axial assembly precision of the mandrel 100 and the winding drum 200 during hot-loading is ensured.
Fig. 5 illustrates another method of assembling a mast head, which is also applicable to the jumbo reel 200 assembly described above, according to an embodiment of the present disclosure. As shown in fig. 5, the assembling method includes:
step 501: a mandrel 100 is provided, the mandrel 100 being the mandrel 100 to be assembled.
The structure of the mandrel 100 can be seen in fig. 3, and the structure thereof is the same as the mandrel 100 described in step 201, and is not repeated herein.
Step 502: a reel 200 is provided, the reel 200 being the reel 200 to be assembled.
The structure of the spool 200 can be seen in fig. 4, which is substantially the same as the spool 200 described in step 202, except for the dimensions.
As can be seen from the foregoing, the minimum interference between the first mating shaft hole 210 and the first mating shaft segment 120 is greater than the maximum interference between the second mating shaft hole 220 and the second mating shaft segment 130. To ensure that the first mating shaft hole 210 can be shrunk into place during the subsequent cooling process 507, that is, the positioning and fixing between the first mating shaft hole 210 and the first mating shaft segment 120 are completed. In the assembly method provided by the embodiment of the present disclosure, the fitting tolerance between the first fitting shaft hole 210 and the first fitting shaft segment 120 is H8/p7, and the fitting tolerance between the second fitting shaft hole 220 and the second fitting shaft segment 130 is H8/k 7.
In the above implementation, H8/p7 refers to a base hole system transition fit of a hole with a base deviation of H and an accuracy rating of 8 with an axis with a base deviation of p and an accuracy rating of 7. H8/k7 indicates a base hole system transition fit of a hole with a base deviation of H and an accuracy rating of 8 with an axis with a base deviation of k and an accuracy rating of 7. It can be seen that the minimum interference magnitude between the first matching shaft hole 210 and the first matching shaft section 120 is greater than the maximum interference magnitude between the second matching shaft hole 220 and the second matching shaft section 130, so that the first matching shaft hole 210 is shrunk in place in the subsequent cooling step 507, that is, the first matching shaft hole 210 and the first matching shaft section 120 are positioned and fixed in place.
Of course, in other embodiments, the fitting tolerance between the first fitting shaft hole 210 and the first fitting shaft section 120 and the fitting tolerance between the second fitting shaft hole 220 and the second fitting shaft section 130 may be adjusted according to actual requirements, as long as the requirement that the minimum interference between the first fitting shaft hole 210 and the first fitting shaft section 120 is greater than the maximum interference between the second fitting shaft hole 220 and the second fitting shaft section 130 is met. The present disclosure is not so limited.
Step 503: the winding drum 200 is vertically placed such that the first and second coupling shaft holes 210 and 220 are perpendicular to the horizontal plane and the first coupling shaft hole 210 is located above the second coupling shaft hole 220.
In this way, it is possible to facilitate not only the heating in the subsequent step 504, but also the assembly of the mandrel 100 in the subsequent step 505.
Alternatively, step 503 may be implemented by:
first, a stent 300 (see fig. 6) is provided.
Since the roll 200 is heated in step 504, the support 300 needs to be made of a material with high temperature resistance and have a certain strength to stably support the roll 200. For example, the bracket 300 is made of a material such as a hot strength steel.
The roll 200 is then rested on the stand 300.
In order to ensure the stable support of the support 300 to the winding drum 200, the support 300 may have a groove for receiving the end of the winding drum 200.
Step 504: the roll 200 is heated.
In this way, the principle of expansion with heat and contraction with cold can be utilized to expand the bore diameters of the first and second fitting shaft holes 210 and 220 to facilitate the insertion of the mandrel 100 into the reel 200 in step 505.
It should be noted that after heating, the bore diameters of the first and second mating shaft holes 210 and 220 need to be expanded to meet the minimum clearance of the shrink fit. Then, the thermal expansion of the bore diameters of the first and second mating shaft holes 210 and 220 is equal to the respective interference and shrink fit minimum clearance.
And the minimum clearance and the heating quantity of the hot charging can be selected and calculated by referring to related terms of JB/T5000.8 Assembly general technical Condition for heavy machinery.
Illustratively, step 504 may be achieved by electromagnetic heating, lamp heating, or the like. The present disclosure is not so limited.
Step 505: the mandrel 100 is inserted into the mandrel 200 such that the shoulder 110 abuts an end of a first mating axial bore 210, the first mating axial segment 120 is located in the first mating axial bore 210, and the second mating axial segment 130 is located in the second mating axial bore 220.
Alternatively, step 505 may be implemented by:
first, the mandrel 100 is hoisted such that the first mating shaft segment 120 is located above the second mating shaft segment 130 (see fig. 7).
Illustratively, the mandrel 100 may be hoisted by a crane, or the like.
To facilitate lifting of the mandrel 100, a lifting lug 140 may be secured to the end of the mandrel 100 adjacent the first mating shaft segment 120. The lifting lug 140 can be fixed in a welding manner, and can be detached after the complete assembly of the jumbo reel assembly, so that the normal work of the jumbo reel assembly cannot be influenced.
The second mating shaft segment 130 is then aligned with the first mating shaft bore 210 and the mandrel 100 is lowered (see fig. 8). In this way, the weight of the mandrel 100 itself can be utilized to effect movement of the mandrel 100 within the reel 200, i.e., to enable the first mating shaft segment 120 to pass through the second mating shaft aperture 220 and ultimately be located within the first mating shaft aperture 210.
Since the sizes of the winding drum 200 and the mandrel 100 are large, in order to avoid the first matching shaft section 120 from being blocked when passing through the second matching shaft hole 220, in the embodiment, the diameter of the first matching shaft hole 210 is increased, so that the diameter of the first matching shaft hole 210 is 3-7mm larger than that of the second matching shaft hole 220, considering the assembly manufacturability. In this way, it can be ensured that the first coupling shaft portion 120 smoothly passes through the second coupling shaft hole 220.
Illustratively, the bore diameter of the first mating shaft hole 210 is 5mm larger than the bore diameter of the second mating shaft hole 220. In this case, if the inner diameter of the second coupling shaft hole 220 is 1020mm, the inner diameter of the first coupling shaft hole 210 is 1025 mm.
Alternatively, the bore diameter of the first fitting shaft hole 210 may be increased at the time of design, so that the increased first fitting shaft hole 210 can be obtained at the time of production and manufacture. In addition, the inner wall of the first fitting shaft hole 210 may be ground at a later stage to increase the diameter of the second fitting shaft hole 220.
Step 506: a weight 400 is provided and the weight 400 is placed at the end of the first mating shaft segment 120 remote from the second mating shaft segment 130 such that the direction of gravity of the weight 400 is the same as the axial direction of the first mating shaft segment 120.
As can be seen from the foregoing, the axial fit between the mandrel 100 and the mandrel 200 is in place when the shoulder 110 abuts the end of the first mating shaft hole 210. Since the mandrel 100 is inserted into the winding drum 200 from top to bottom, a weight 400 is placed at the end of the first matching shaft section 120 far away from the second matching shaft section 130, and the weight of the weight 400 can be utilized to enable the shaft shoulder 110 to be pressed at the end of the first matching shaft hole 210 all the time, so that the axial assembly precision between the mandrel 100 and the winding drum 200 is ensured.
In order to secure the pressing-down effect of the weight 400, optionally, the weight 400 is made to have a gravity greater than the maximum frictional force between the first coupling shaft segment 120 and the first coupling shaft hole 210.
It will be readily appreciated that the friction between first mating shaft segment 120 and first mating shaft bore 210 is small before first mating shaft bore 210 is not fully shrunk by cooling, i.e., a minimal clearance of shrink fit with first mating shaft segment 120 exists, and the effect of weight 400 pressing down on mandrel 100 is naturally better. As the mandrel 100 is cooled, the minimum clearance between the first engaging shaft hole 210 and the first engaging shaft portion 120 will disappear, and the friction between the first engaging shaft portion 120 and the first engaging shaft hole 210 will be maximized, so that the effect of the weight 400 pressing down the mandrel 100 is not good. Based on this, in the present embodiment, it is necessary to place the weight 400 before the frictional force between the first coupling shaft segment 120 and the first coupling shaft hole 210 reaches the maximum.
Step 507: the spool 200 is cooled.
In this way, the principle of cold expansion and cold contraction can be utilized to make the bore diameters of the first and second matching shaft holes 210 and 220 decrease so as to clamp the mandrel 100 in the winding drum 200.
In this embodiment, since the shrinkage amount of the second matching shaft hole 220 is larger and the shrinkage time is longer during the cooling process, in order to avoid the problem of stress concentration between the shrunk second matching shaft hole 220 and the second matching shaft section 130, optionally, the hole length of the second matching shaft hole 220 is lengthened, so that the hole length of the second matching shaft hole 220 is 3-7mm longer than the hole length of the first matching shaft hole 210.
In the above implementation, since the hole length of the second coupling shaft hole 220 is increased, the contact area between the second coupling shaft hole 220 and the second coupling shaft section 130 is increased, and the problem of stress concentration is avoided.
Illustratively, the bore length of the second mating shaft hole 220 may be increased at the time of design, so that the increased second mating shaft hole 220 may be obtained at the time of manufacture. In addition, a pipe fitting may be coaxially welded at both ends of the second coupling shaft hole 220 to increase the hole length of the second coupling shaft hole 220.
Optionally, the lengths of the two ends of the second fitting shaft hole 220 are respectively increased by the same amount, so that the second fitting shaft section 130 can be prevented from slipping out due to the insufficient length of one end of the second fitting shaft hole 220.
For example, both ends of the first fitting shaft hole 210 are lengthened by 2.5mm, i.e., the first fitting shaft hole 210 is lengthened by 5mm as a whole.
The following briefly introduces an implementation flow of the assembly method provided by the embodiment of the present disclosure:
(1) providing the required mandrel 100 and mandrel 200.
(2) The heating reel 200 expands the diameters of the first and second fitting shaft holes 210 and 220 by using the principle of expansion with heat and contraction with cold, so as to facilitate the insertion of the mandrel 100 in the subsequent steps.
(3) The mandrel 100 is inserted into the mandrel 200 such that the shoulder 110 abuts the end of the first mating shaft hole 210, the first mating shaft segment 120 is located in the first mating shaft hole 210, and the second mating shaft segment 130 is located in the second mating shaft hole 220, i.e., the mandrel 100 and the mandrel 200 are assembled in place.
(4) Weight 400 is placed on the end of first mating shaft segment 120 distal from second mating shaft segment 130.
(5) And cooling the winding drum 200, and utilizing the principle of cold expansion and cold contraction to enable the bore diameters of the first matching shaft hole 210 and the second matching shaft hole 220 to be reduced so as to clamp the mandrel 100 in the winding drum 200.
In the above assembling process, since the minimum interference magnitude between the first engaging shaft hole 210 and the first engaging shaft section 120 is greater than the maximum interference magnitude between the second engaging shaft hole 220 and the second engaging shaft section 130, the first engaging shaft hole 210 is firstly shrunk in place in the cooling process, that is, the first engaging shaft hole 210 and the first engaging shaft section 120 are firstly positioned and fixed. While the second mating axial bore 220 continues to contract, the axial and radial positions between the first mating axial bore 210 and the first mating shaft segment 120 do not change, and the positioning of the shoulder 110 is not affected. Subsequently, the second matching shaft hole 220 is also shrunk into place, i.e. the positioning and fixing are completed after the second matching shaft hole 220 and the second matching shaft section 130, thereby completing the whole assembly work between the mandrel 100 and the winding drum 200.
Also, since the weight 400 is placed at the end of the first coupling shaft segment 120 far from the second coupling shaft segment 130, the shoulder 110 can be always pressed against the end of the first coupling shaft hole 210 by the gravity of the weight 400, thereby ensuring the accuracy of the axial assembly between the mandrel 100 and the mandrel 200.
That is, by the advanced positioning of the first coupling shaft hole 210 and the first coupling shaft section 120 close to the shaft shoulder 110 and placing the weight 400, the subsequent cooling shrinkage process does not affect the axial positioning of the shaft shoulder 110, and the axial assembling precision of the mandrel 100 and the winding drum 200 during hot-loading is ensured.
The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.
Claims (9)
1. A method of assembling a shaft bore, comprising:
providing a mandrel (100) such that the mandrel (100) comprises a shoulder (110), a first mating shaft section (120) and a second mating shaft section (130) that are coaxially connected together, the shoulder (110) being coaxially connected to an outer peripheral wall of the first mating shaft section (120) and distal from the second mating shaft section (130);
providing a winding drum (200) such that the winding drum (200) comprises a first matching shaft hole (210) and a second matching shaft hole (220) which are coaxially arranged, wherein the minimum interference between the first matching shaft hole (210) and the first matching shaft section (120) is larger than the maximum interference between the second matching shaft hole (220) and the second matching shaft section (130), and the hole length of the second matching shaft hole (220) is 3-7mm larger than that of the first matching shaft hole (210);
-heating the reel (200);
inserting the mandrel (100) into the mandrel (200) such that the shoulder (110) abuts an end of the first mating shaft aperture (210), the first mating shaft segment (120) being located in the first mating shaft aperture (210), the second mating shaft segment (130) being located in the second mating shaft aperture (220);
cooling the reel (200).
2. The method of assembling of claim 1, wherein a minimum interference between the first mating shaft bore (210) and the first mating shaft segment (120) is greater than a maximum interference between the second mating shaft bore (220) and the second mating shaft segment (130), comprising:
the fit tolerance between the first mating shaft hole (210) and the first mating shaft segment (120) is H8/p7, and the fit tolerance between the second mating shaft hole (220) and the second mating shaft segment (130) is H8/k 7.
3. The assembly method according to claim 1, wherein said providing a reel (200) further comprises:
enlarging the aperture of the first matching shaft hole (210) to enable the aperture of the first matching shaft hole (210) to be 3-7mm larger than that of the second matching shaft hole (220).
4. The assembly method according to claim 1, characterized in that it comprises, before said heating of said mandrel (200):
vertically placing the winding drum (200) so that the first matching shaft hole (210) and the second matching shaft hole (220) are vertical to the horizontal plane, and the first matching shaft hole (210) is positioned above the second matching shaft hole (220).
5. Assembly method according to claim 4, wherein said vertical positioning of said mandrel (200) comprises:
providing a support (300);
resting the reel (200) on the stand (300).
6. The assembly method according to claim 1, wherein said inserting of said mandrel (100) into said mandrel (200) comprises:
hoisting the mandrel (100) such that the first mating shaft segment (120) is located above the second mating shaft segment (130);
aligning the second mating shaft segment (130) with the first mating shaft aperture (210) and lowering the mandrel (100).
7. The assembly method according to claim 1, characterized in that, after said insertion of said mandrel (100) into said mandrel (200), it further comprises:
providing a weight (400);
placing the weight (400) at an end of the first mating shaft segment (120) distal from the second mating shaft segment (130) such that a direction of gravity of the weight (400) is the same as an axial direction of the first mating shaft segment (120).
8. The assembly method of claim 7, wherein said providing a weight (400) comprises:
such that a weight force of the weight (400) is greater than a maximum frictional force between the first coupling shaft segment (120) and the first coupling shaft hole (210).
9. The method of assembling of claim 7, wherein said placing the weight (400) at the end of the first mating shaft segment (120) distal from the second mating shaft segment (130) comprises:
placing the weight (400) before the friction force between the first coupling shaft segment (120) and the first coupling shaft hole (210) reaches a maximum.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010896925.4A CN112276474B (en) | 2020-08-31 | 2020-08-31 | Method for assembling shaft hole |
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|---|---|---|---|
| CN202010896925.4A CN112276474B (en) | 2020-08-31 | 2020-08-31 | Method for assembling shaft hole |
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| CN112276474B true CN112276474B (en) | 2022-05-13 |
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|---|---|---|---|---|
| CN114850781B (en) * | 2022-05-10 | 2023-06-27 | 中国水利水电夹江水工机械有限公司 | Method for assembling winding drum and winding drum shaft of large ship lift |
| CN115446563B (en) * | 2022-08-17 | 2024-01-19 | 武汉船用机械有限责任公司 | Assembly device and assembly method for pulley block |
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| CN112276474A (en) | 2021-01-29 |
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