CN211540313U - Clamping tool for cutting ultrathin-wall tubular parts - Google Patents
Clamping tool for cutting ultrathin-wall tubular parts Download PDFInfo
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- CN211540313U CN211540313U CN201922066117.0U CN201922066117U CN211540313U CN 211540313 U CN211540313 U CN 211540313U CN 201922066117 U CN201922066117 U CN 201922066117U CN 211540313 U CN211540313 U CN 211540313U
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Abstract
The utility model discloses a clamping utensil for ultra-thin wall tubular part cutting process, compress tightly the subassembly including dabber, position sleeve and axial, the dabber includes the minor diameter end of a body coupling and holds with the big footpath of position sleeve interference connection, and the external diameter of position sleeve slightly is greater than the internal diameter of waiting to process ultra-thin wall tubular part, and its length slightly is greater than the length of waiting to process ultra-thin wall tubular part, and the coefficient of thermal expansion of position sleeve is far above the dabber and waits to process the coefficient of thermal expansion of ultra-thin wall tubular part. The purpose of smoothly loading and unloading the parts and uniformly clamping and fixing the parts is achieved by using the material characteristic of high thermal expansion rate of the positioning sleeve of the clamping device in a mode of thermal expansion and cold contraction, the processing precision of the parts is ensured, and the design requirement is met.
Description
Technical Field
The utility model relates to a part cutting process technical field especially relates to a clamping utensil that is used for ultra-thin wall tubular part cutting process.
Background
The ultra-thin wall tubular part cutting process needs to be carried out on the ultra-thin wall tubular part with the thickness of about 0.5mm, has extremely high precision requirement and belongs to ultra-precision processing of the ultra-thin wall part. Because the wall thickness of the part is ultra-thin, the part can not be directly clamped by using a jaw of a numerical control lathe, and the deformation of the processed part can be easily caused in the part loading and unloading process of the common mandrel clamping, so that the design precision requirement can not be met, a special clamping fixture needs to be designed, the ultra-thin wall tubular part is completely fixed on the premise of ensuring the smooth loading and unloading of the part, the clamping force is uniform, the cutting is completed, and the design requirement is met.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a clamping utensil that is used for ultra-thin wall tubular part cutting process to the defect that the difficult clamping of ultra-thin wall tubular part is difficult for or uses ordinary dabber clamp at the dismantlement in-process yielding among the prior art in the cutting process. The fixture comprises a mandrel and a positioning sleeve, wherein the outer diameter of the positioning sleeve is larger than the inner diameter of the ultrathin-wall tubular part to be processed, the length of the positioning sleeve is larger than the length of the ultrathin-wall tubular part to be processed, and the thermal expansion coefficient of the positioning sleeve is higher than that of the mandrel and the ultrathin-wall tubular part to be processed.
For realizing the utility model discloses a technical scheme that the purpose adopted is:
a clamping tool for cutting ultrathin-wall tubular parts comprises a mandrel, a positioning sleeve and an axial compression assembly for compressing the mandrel and the positioning sleeve, wherein:
the mandrel comprises a small-diameter end and a large-diameter end, wherein the small-diameter end is used for assembling a machine tool, the large-diameter end is nested in the positioning sleeve and is in interference connection with the positioning sleeve, and the small-diameter end and the large-diameter end are integrally connected;
the cylindrical outer wall of the locating sleeve forms a locating surface which radially limits the position of the ultra-thin wall tubular part, the tail end of the locating sleeve is provided with a convex spigot which axially limits the position of the ultra-thin wall tubular part, the length of the locating surface is greater than that of the ultra-thin wall tubular part to be processed, the outer diameter of the locating surface is greater than the inner diameter of the ultra-thin wall tubular part to be processed at normal temperature, and the thermal expansion coefficient of the locating sleeve is higher than that of the mandrel and the ultra-thin wall tubular part.
In the above technical solution, the axial compression assembly includes a limiting boss formed on the mandrel, a pressure plate matched with a compression platform formed in the locating sleeve, and a screw fastening the pressure plate to the large-diameter end, wherein the limiting boss and the pressure plate limit the locating sleeve and the mandrel from two directions to make axial relative movement.
In the technical scheme, a gasket is arranged on the contact surface of the screw and the pressure plate;
in the technical scheme, the nut cap of the screw is provided with the hexagon socket.
In the above technical solution, a concave spigot is formed at the head end of the positioning sleeve.
In the technical scheme, the outer diameter of the positioning sleeve is 0.3-0.5mm larger than the inner diameter of the ultrathin-wall tubular part to be processed.
In the technical scheme, the thermal expansion coefficient of the positioning sleeve is 10-100 times that of the mandrel and the ultrathin-wall tubular part to be processed.
In the above technical scheme, the positioning sleeve is made of nylon, and the mandrel is made of steel.
The clamping method for machining the ultra-thin-wall tubular part by using the clamping tool comprises the following steps:
step 1: inserting the large-diameter end of the mandrel into the positioning sleeve to enable the mandrel and the positioning sleeve to be in interference connection, pressing the mandrel and the positioning sleeve through an axial pressing assembly to assemble a clamping device, and freezing the clamping device until the positioning sleeve shrinks to an outer diameter smaller than the inner diameter of the ultrathin-wall tubular part to be processed;
step 2: sleeving an ultrathin-wall tubular part to be processed outside the positioning sleeve, wherein one end of the ultrathin-wall tubular part is abutted against the convex spigot, so that the axial fixation of the ultrathin-wall tubular part is completed;
and step 3: heating a fixture with the to-be-processed ultrathin-wall tubular part, wherein the positioning sleeve expands and rises uniformly, and the positioning surface abuts against the inner wall of the to-be-processed ultrathin-wall tubular part to complete radial fixation of the ultrathin-wall tubular part so as to completely fix the to-be-processed ultrathin-wall tubular part on the fixture;
and 4, step 4: mounting the small-diameter end on a jaw of a machine tool, and cutting;
and 5: and after the processing is finished, loosening the clamping jaws, dismounting the clamping fixture, freezing the clamping fixture expanded with the ultrathin-wall tubular part, shrinking the positioning sleeve to an outer diameter smaller than the inner diameter of the ultrathin-wall tubular part, and taking down the ultrathin-wall tubular part.
In the technical scheme, in the step 1 and the step 5, the freezing temperature is-15 to-30 ℃; in step 3, the temperature is increased to the working environment temperature (15-30 ℃).
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model provides a clamping utensil suitable for super thin wall tubulose part cutting process on numerical control lathe, the high thermal expansion coefficient of position sleeve has been utilized at the clamping in-process, through expend with heat and contract with cold principle, make and treat that ultra-thin wall tubulose part can assemble smoothly on the clamping utensil after freezing, and after heaing up to operational environment temperature, the position sleeve is heated the even expansion of thermal expansion and props up the inner chamber of treating processing ultra-thin wall tubulose part, make the assembly treat that processing ultra-thin wall tubulose part is even clamping on the position sleeve above that, ultra-thin wall tubulose part axial complete fixation has been realized, radial even atress is fixed, satisfy the designing requirement, accomplish the ultra-precision cutting process of ultra-thin wall tubulose part.
2. The utility model provides a clamping apparatus for ultra-thin wall tubular part cutting process has utilized the high thermal expansion coefficient of position sleeve at the dismantlement in-process, through expend with heat and contract with cold principle, makes the position sleeve after freezing shrink to its internal diameter that its external diameter is less than the ultra-thin wall tubular part after the processing, has the clearance between the two to the ultra-thin wall tubular part after the cooperation position sleeve tail end is made processing is dismantled smoothly from clamping apparatus and is got off and not take place to warp to the concave tang of segment.
Drawings
Fig. 1 is a schematic view of the whole structure of the clamping apparatus of the present invention.
Fig. 2 is a schematic view of the sectional structure of the clamping device of the present invention.
In the figure: 1-mandrel, 1-1-small diameter end, 1-2-large diameter end, 1-3-limiting boss, 2-locating sleeve, 2-1-convex spigot, 2-2-concave spigot, 2-3-pressing platform, 3-pressing plate, 4-screw and 5-gasket.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following embodiments, the small diameter end 1-1 is used as the tail end, and the end far from the small diameter end 1-1 is used as the head end.
Example 1
A fixture for cutting ultra-thin-walled tubular parts, as shown in fig. 1 and 2, comprising a mandrel 1, a positioning sleeve 2 and an axial compression assembly for compressing the mandrel 1 and the positioning sleeve 2, wherein:
the mandrel 1 comprises a small-diameter end 1-1 for assembling a machine tool and a large-diameter end 1-2 nested in the positioning sleeve and connected with the positioning sleeve 2 in an interference manner, and the small-diameter end 1-1 and the large-diameter end 1-2 are integrally connected;
the cylindrical outer wall of the locating sleeve 2 forms a locating surface which radially limits the position of the ultra-thin wall tubular part, a convex spigot 2-1 which axially limits the position of the ultra-thin wall tubular part is formed at the tail end, the length of the locating surface is greater than that of the ultra-thin wall tubular part to be processed, the outer diameter of the locating surface is greater than the inner diameter of the ultra-thin wall tubular part to be processed at normal temperature, and the thermal expansion coefficient of the locating sleeve 2 is higher than that of the mandrel 1 and the ultra-thin wall tubular part.
When the temperature difference exists, the contraction and expansion rates of the positioning sleeve 2 are far greater than those of the mandrel 1 and the ultrathin-wall tubular part to be processed, so that the positioning sleeve 2 contracts at low temperature until the outer diameter of the positioning sleeve 2 is smaller than the inner diameter of the ultrathin-wall tubular part to be processed, and the ultrathin-wall tubular part to be processed can be smoothly assembled on the positioning sleeve 2; when the temperature rises, the positioning sleeve 2 expands, and the expansion rate of the positioning sleeve is far greater than that of the ultrathin-wall tubular part to be processed, so that the outer diameter of the positioning sleeve 2 is slightly greater than the inner diameter of the ultrathin-wall tubular part to be processed after the temperature rises, the positioning sleeve 2 can be ensured to uniformly expand in the radial direction, the inner cavity of the ultrathin-wall tubular part to be processed is supported, the purposes of uniformly clamping and fixing in the radial direction are achieved, and the cutting processing of the ultrathin-wall tubular part can be completed.
Specifically, the axial compression assembly comprises limiting bosses 1-3 formed on the mandrel 1, a pressure plate 3 matched with compression platforms 2-3 formed in the positioning sleeve 2 and a screw 4 for fastening the pressure plate 3 on the large-diameter end 1-2, wherein the limiting bosses 1-3 and the pressure plate 3 limit the positioning sleeve 2 and the mandrel 1 from axial relative movement from two directions. The positioning sleeve 2 is press-fitted in the limiting boss 1-3 of the mandrel 1 in an interference manner, when the pressing plate 3 is press-fitted in the limiting boss 1-3, the pressing surface of the pressing plate 3 is abutted against the end surface of the mandrel 1 and is fixed by the pressing plate 3, the matching screw 4 and the gasket 5, so that the positioning sleeve 2 is ensured to be completely fixed on the mandrel 1.
The using method comprises the following steps:
step 1: inserting the large-diameter end 1-2 of the mandrel 1 into the positioning sleeve 2 to enable the mandrel 1 and the positioning sleeve 2 to be in interference connection, pressing the mandrel 1 and the positioning sleeve 2 through an axial pressing assembly to assemble a clamping tool, integrally placing the clamping tool in a freezer at-20 ℃ to a constant temperature, freezing the clamping tool until the positioning sleeve 2 shrinks until the outer diameter is smaller than the inner diameter of the ultra-thin-wall tubular part to be processed, and enabling the ultra-thin-wall tubular part to be processed to be smoothly assembled on the positioning sleeve 2;
step 2: sleeving an ultrathin-wall tubular part to be processed outside the positioning sleeve 2, wherein one end of the ultrathin-wall tubular part is abutted against the convex spigot 2-1, so that the axial fixation of the ultrathin-wall tubular part is completed;
and step 3: the working environment of a fixture provided with the ultra-thin wall tubular part to be processed is lowered to a constant temperature, the positioning sleeve 2 expands and uniformly rises, the positioning surface is abutted against the inner wall of the ultra-thin wall tubular part to be processed, the inner cavity of the ultra-thin wall tubular part to be processed is supported, and the radial fixation of the ultra-thin wall tubular part is completed, so that the ultra-thin wall tubular part to be processed is completely fixed on the fixture;
and 4, step 4: mounting the small-diameter end 1-1 on a jaw of a machine tool, and cutting;
and 5: after the processing is finished, the clamping jaws are loosened, the clamping fixture is disassembled, the whole clamping fixture with the expanded ultrathin-wall tubular part is put into a freezer at the temperature of minus 20 ℃ to be at a constant temperature, the positioning sleeve 2 is contracted until the outer diameter is smaller than the inner diameter of the ultrathin-wall tubular part, a gap exists between the positioning sleeve 2 and the processed ultrathin-wall tubular part, and the processed ultrathin-wall tubular part is taken down.
Example 2
This embodiment is described based on embodiment 1, and its preferred structure is described.
Preferably, a washer 5 is provided on a contact surface between the screw 4 and the pressure plate 3 to prevent the screw 4 from loosening.
The nut cap of the screw 4 is provided with an inner hexagon 4-1 which can be matched with an inner hexagon wrench for use, so that force application and screwing are convenient.
Preferably, a concave spigot 2-2 is formed at the head end of the positioning sleeve 2.
In the using method step 5, the small section of the concave spigot 2-2 at the head end of the positioning sleeve 2 is convenient for dismounting the processed ultrathin-wall tubular part.
The head end of position sleeve 2 is formed with a ladder groove, the head of a nail of screw 4 is located the ladder inslot to avoid hindering the processing of ultra-thin wall tubular part.
Example 3
This example describes the physical properties of the positioning sleeve based on examples 1 and 2.
The outer diameter of the locating sleeve 2 is 0.3-0.5mm larger than the inner diameter of the ultrathin-wall tubular part to be processed. Within the range, the outer diameter of the positioning sleeve 2 can be ensured to be smaller than the inner diameter of the ultra-thin-wall tubular part to be processed when the positioning sleeve contracts at low temperature, and the positioning sleeve can uniformly rise to the outer diameter after the temperature is raised to the working environment temperature and is larger than the inner diameter of the ultra-thin-wall tubular part to be processed, so that enough radial supporting force is applied to the ultra-thin-wall tubular part to be processed, and the radial uniform clamping and fixing are ensured.
The thermal expansion coefficient of the positioning sleeve 2 is 10-100 times of that of the mandrel 1 and the ultrathin-wall tubular part to be processed.
Because the thermal expansion coefficients of the locating sleeve 2, the mandrel 1 and the to-be-processed ultrathin-wall tubular part have larger difference, when the temperature difference exists, the contraction and expansion rate of the locating sleeve 2 are far greater than those of the mandrel 1 and the to-be-processed ultrathin-wall tubular part, so that the situation that the locating sleeve contracts in large quantity to smoothly assemble the to-be-processed ultrathin-wall tubular part at low temperature is ensured, the locating sleeve expands after being heated to uniformly rise the to-be-processed ultrathin-wall tubular part and is completely and fixedly arranged in the radial direction, and the locating sleeve contracts in large quantity to smoothly disassemble the processed ultrathin-wall tubular part at low temperature.
The locating sleeve 2 is made of nylon, the mandrel 1 and the ultrathin-wall tubular part to be processed are made of steel, and the thermal expansion coefficient of the nylon is 7.6-8.3 × 10-5The thermal expansion coefficient of steel is 1.01 × 10-6The two have different thermal expansion coefficients by orders of magnitude.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A clamping tool for cutting ultrathin-wall tubular parts is characterized by comprising a mandrel (1), a positioning sleeve (2) and an axial compression assembly for fixing the mandrel (1) and the positioning sleeve (2) together, wherein:
the mandrel (1) comprises a small-diameter end (1-1) used for being assembled with a machine tool and a large-diameter end (1-2) nested in the locating sleeve (2) and connected with the locating sleeve (2) in an interference mode, and the small-diameter end (1-1) and the large-diameter end (1-2) are integrally connected;
the cylindrical outer wall of the locating sleeve (2) is formed into a locating surface which radially limits the position of the ultra-thin wall tubular part, a convex spigot (2-1) which axially limits the position of the ultra-thin wall tubular part is formed at the tail end of the locating sleeve, the length of the locating surface is greater than that of the ultra-thin wall tubular part to be processed, the outer diameter of the locating surface is greater than the inner diameter of the ultra-thin wall tubular part to be processed at normal temperature, and the thermal expansion coefficient of the locating sleeve (2) is higher than that of the mandrel (1) and the ultra-thin wall tubular part.
2. The clamp for cutting and machining an ultra-thin-wall tubular part according to claim 1, characterized in that the axial compression assembly comprises a limiting boss (1-3) formed on the mandrel (1), a pressure plate (3) matched with a compression platform (2-3) formed in the locating sleeve (2), and a screw (4) for fastening the pressure plate (3) on the large-diameter end (1-2), wherein the limiting boss (1-3) and the pressure plate (3) limit the axial relative movement of the locating sleeve (2) and the mandrel (1) from two directions.
3. The holder for the cutting machining of ultra thin-walled tubular parts according to claim 2, characterized in that the contact surface of the screw (4) and the pressure plate (3) is provided with a spacer (5).
4. The fixture for ultra-thin-walled tubular parts cutting according to claim 3, characterized in that the head of the screw (4) is provided with a hexagon socket (4-1).
5. The holder for machining ultrathin-walled tubular parts as claimed in claim 1, characterized in that the head end of the locating sleeve (2) is formed with a female spigot (2-2).
6. The holder for machining ultrathin-walled tubular parts according to claim 1, characterized in that the outer diameter of the locating sleeve (2) is larger than the inner diameter of the ultrathin-walled tubular part to be machined.
7. The clamp for cutting machining of ultra-thin-walled tubular parts according to claim 1, characterized in that the outer diameter of the locating sleeve (2) is 0.3-0.5mm larger than the inner diameter of the ultra-thin-walled tubular part to be machined.
8. The holder for the cutting machining of ultra-thin-walled tubular parts according to claim 7, characterized in that the coefficient of thermal expansion of the locating sleeve (2) is 10-100 times that of the mandrel (1) and the ultra-thin-walled tubular part to be machined.
9. The clamp for cutting machining of ultra-thin-walled tubular parts according to claim 8, characterized in that the material of the locating sleeve (2) is nylon.
10. The holder for machining ultrathin-walled tubular components as claimed in claim 9, characterized in that the material of the mandrel (1) is steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922066117.0U CN211540313U (en) | 2019-11-26 | 2019-11-26 | Clamping tool for cutting ultrathin-wall tubular parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922066117.0U CN211540313U (en) | 2019-11-26 | 2019-11-26 | Clamping tool for cutting ultrathin-wall tubular parts |
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| Publication Number | Publication Date |
|---|---|
| CN211540313U true CN211540313U (en) | 2020-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922066117.0U Active CN211540313U (en) | 2019-11-26 | 2019-11-26 | Clamping tool for cutting ultrathin-wall tubular parts |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112548639A (en) * | 2021-01-20 | 2021-03-26 | 中核(天津)科技发展有限公司 | Clamping tool for axial slicing machining of thin-wall cylindrical part |
| CN112571115A (en) * | 2021-01-20 | 2021-03-30 | 中核(天津)科技发展有限公司 | Clamping fixture for axial groove milling of tubular part |
-
2019
- 2019-11-26 CN CN201922066117.0U patent/CN211540313U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112548639A (en) * | 2021-01-20 | 2021-03-26 | 中核(天津)科技发展有限公司 | Clamping tool for axial slicing machining of thin-wall cylindrical part |
| CN112571115A (en) * | 2021-01-20 | 2021-03-30 | 中核(天津)科技发展有限公司 | Clamping fixture for axial groove milling of tubular part |
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