CN109175920A - Polytetrafluoroethylene (PTFE) thin walled cylinder body class method of processing parts - Google Patents
Polytetrafluoroethylene (PTFE) thin walled cylinder body class method of processing parts Download PDFInfo
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- CN109175920A CN109175920A CN201811320353.4A CN201811320353A CN109175920A CN 109175920 A CN109175920 A CN 109175920A CN 201811320353 A CN201811320353 A CN 201811320353A CN 109175920 A CN109175920 A CN 109175920A
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- polytetrafluoroethylene
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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
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention discloses a kind of polytetrafluoroethylene (PTFE) thin walled cylinder body class method of processing parts, stress relief annealing and furnace cooling-constant temperature Vehicle Processing-cleaning-constant temperature inspection.Polytetrafluoroethylene (PTFE) blank is subjected to stress relief annealing before processing, keeps the structure of material more stable, more conducively processes；Using constant temperature processing, the machining process of Constant Temperature Detection, reduce part deformation problem, to improve the form accuracy of part processing and detection；It is processed using stress relief annealing, constant temperature, the processing scheme of Constant Temperature Detection, solves polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part and process easily-deformable, the uppity problem of size shape precision.
Description
Technical field
The invention belongs to wall sleeve part processing method technical fields, in particular to a kind of polytetrafluoroethylene (PTFE) thin walled cylinder body
Class method of processing parts.
Background technique
Polytetrafluoroethylene (PTFE) has heat-resisting, cold-resistant, chemical resistance and excellent weatherability, and has special electrical property
It is energy, surface characteristic, non-stick, the features such as self-lubrication and low-friction coefficient.It is widely used in national defence, military project, space flight and aviation, vapour
Many fields such as vehicle, petrochemical industry.Polytetrafluoroethylene (PTFE) is as one of maximum high performance material of dosage in aviation and wide, especially
It is sealing material, applied to installation booster explosive, the propagation of explosion fuse in all kinds of global blowup warhead charge body propagation of explosion components
Fixed structure piece.Although having above-mentioned excellent performance, because polytetrafluoroethylene (PTFE) molecule is more stiff, helically type structure is so that divide
It is easy sliding between son, furthermore the crystal region of polytetrafluoroethylene (PTFE) is plasticity, sliding plastic deformation simultaneously is easy when compressed not
It can reply, and in entire loading process, than deformation caused by other movements, plastic deformation is main deformation, thus poly- four
Vinyl fluoride has the shortcomings that easy creep, limits its functionization and functionalization.Therefore, a kind of solution polytetrafluoroethylene (PTFE) material is studied
Expect processing technology, controls its deflection, it is ensured that form accuracy meets design objective and requires biggish meaning.
At present wall sleeve part such as fuse fixing sleeve processing method mainly use polytetrafluoroethylsteel steel bar through vehicle outside
The processes such as circle, boring inner hole are directly machined forming.Due to larger (20~60 DEG C of ranges of polytetrafluoroethylene material linear expansion coefficient
Interior 10.3 × 10-5/ DEG C), with the big performance characteristics of creep-resistant property difference, so fuse fixing sleeve is in processing, storage, transport
Size influenced by ambient temperature is extremely unstable in the process, and product qualification rate is lower.
Summary of the invention
Present invention aim to deficiencies in view of the above technology, provide a kind of not influenced by ambient temperature and size
Stable polytetrafluoroethylene (PTFE) thin walled cylinder body class method of processing parts.
To achieve the above object, the polytetrafluoroethylene (PTFE) thin walled cylinder body class method of processing parts designed by the present invention, including such as
Lower step:
1) polytetrafluoroethylene (PTFE) blank stress relief annealing and furnace cooling: is heated to 160~180 DEG C simultaneously in insulating box
Keep the temperature 2~4h stress relief annealing, then furnace cooling；
2) constant temperature Vehicle Processing: the polytetrafluoroethylene (PTFE) blank by step 1) processing machines to be formed in constant temperature workshop
Required polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part, the temperature of constant temperature workshop are 20 ± 5 DEG C；
3) it cleans: after completion of processing, with washes of absolute alcohol polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part；
4) examine: the polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part by step 3) cleaning is placed on constant temperature workshop, to polytetrafluoro
It is measured again after ethylene thin walled cylinder body class Part temperature is stablized and after identical as constant temperature workshop temperature, and constant temperature workshop temperature is
20±5℃。
Further, in the step 1), 20~33 DEG C are cooled to the furnace.
Further, in the step 2), when environment temperature is at 15~25 DEG C, polytetrafluoroethylene (PTFE) blank size according to
The middle difference control of tolerance；When environment temperature is greater than 25 DEG C, polytetrafluoroethylene (PTFE) blank size is controlled according to the upper deviation of tolerance；
When environment temperature is less than 15 DEG C, polytetrafluoroethylene (PTFE) blank size is controlled according to the lower deviation of tolerance.
Further, in the step 2), the detailed process of constant temperature Vehicle Processing are as follows:
Centering polytetrafluoroethylene (PTFE) blank center, the machining center through-hole on numerically controlled lathe；Clamping centering polytetrafluoroethylene (PTFE)
Blank outer circle, polytetrafluoroethylene (PTFE) blank zero point of reference frame are located at the center of right side, and planar end surface is light-exposed, using internal lathe-tool
The pre- bore hole of Vehicle Processing；Turn around clamping polytetrafluoroethylene (PTFE) blank, and planar end surface is light-exposed, in polytetrafluoroethylene (PTFE) blank left end uses
Threading tool Vehicle Processing internal screw thread；Then at the internal screw thread for using screw thread mould clamping polytetrafluoroethylene (PTFE) blank, centering surplus
Uniformly distributed, polytetrafluoroethylene (PTFE) blank zero point of reference frame is located at the center of right side, and planar end surface is light-exposed, using internal lathe-tool Vehicle Processing
Bore hole, turning, cutting, deburring, sharp edge are blunt.
Further, in the step 2), revolving speed is 80~100r/min, every turn when polytetrafluoroethylene (PTFE) blank Vehicle Processing
The amount of feeding is 0.2~0.3mm.
Further, the size of the polytetrafluoroethylene (PTFE) blank internal screw thread is consistent with the size of the screw thread mould.
Compared with prior art, the present invention having the advantage that
1, polytetrafluoroethylene (PTFE) blank is subjected to stress relief annealing before processing, keeps the structure of material more stable, more conducively
Processing；Using constant temperature processing, the machining process of Constant Temperature Detection, reduce part deformation problem, to improve part processing
With the form accuracy of detection；
2, polytetrafluoroethylene (PTFE) thin walled cylinder body class method of processing parts of the present invention is using stress relief annealing, constant temperature processing, constant temperature
It is not easy to control to solve easily-deformable, the size shape precision of polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part processing for the processing scheme of detection
Problem.
Detailed description of the invention
Fig. 1 is polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part process schematic diagram；
Fig. 2 is polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part schematic diagram.
Specific embodiment
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments, convenient for more clearly understanding this
Invention, but they limiting the invention.
Polytetrafluoroethylene (PTFE) thin walled cylinder body class method of processing parts, includes the following steps:
1) polytetrafluoroethylene (PTFE) blank stress relief annealing and furnace cooling: is heated to 160~180 DEG C simultaneously in insulating box
2~4h stress relief annealing is kept the temperature, then cools to 20~33 DEG C with the furnace；Stress relief annealing temperature needs strict control, such as excessively tall and big
In 180 DEG C, polytetrafluoroethylene material itself will generate decomposition, harmful substance hydrogenation fluorine be released, if temperature is too low less than 160
DEG C, stability requirement is not achieved in the structure of material；Processed comparison, polytetrafluoroethylene (PTFE) blank processing after stress relief annealing
Chip becomes band, polytetrafluoroethylene (PTFE) blank of the chip without stress relief annealing processing at comminution, after illustrating stress relief annealing
The machinability of part effectively improves；
2) constant temperature Vehicle Processing: the polytetrafluoroethylene (PTFE) blank by step 1) processing machines to be formed in constant temperature workshop
Required polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part (as shown in Figure 2), the temperature of constant temperature workshop are 20 ± 5 DEG C；
Because constant temperature workshop temperature will receive the influence of the objective factors such as seasonal variations, disengaging enabling in process, so
Real time monitoring environment temperature is needed before processing, when environment temperature is at 15~25 DEG C, polytetrafluoroethylene (PTFE) blank size is according to tolerance
Middle poor (median between the upper deviation and lower deviation) control, when environment temperature be greater than 25 DEG C when, polytetrafluoroethylene (PTFE) blank
Size is controlled according to the upper deviation (maximum value of tolerance) of tolerance, when environment temperature is less than 15 DEG C, polytetrafluoroethylene (PTFE) blank
Size is controlled according to the lower deviation (minimum value of tolerance) of tolerance；When polytetrafluoroethylene (PTFE) blank Vehicle Processing revolving speed be 80~
100r/min, feed of every rotation are 0.2~0.3mm, cause to hurt to operator after preventing polytetrafluoroethylene (PTFE) blank fragmentation from splashing
Evil；
The detailed process of constant temperature Vehicle Processing are as follows:
Centering polytetrafluoroethylene (PTFE) blank center, the machining center through-hole on numerically controlled lathe；Clamping centering polytetrafluoroethylene (PTFE)
Blank outer circle, polytetrafluoroethylene (PTFE) blank zero point of reference frame are located at right side (according to the direction in Fig. 1) center, planar end surface
It is light-exposed, using the pre- bore hole of internal lathe-tool Vehicle Processing；Turn around clamping polytetrafluoroethylene (PTFE) blank, and planar end surface is light-exposed, in polytetrafluoroethyl-ne
Alkene blank left end uses internal screw cutting tool Vehicle Processing internal screw thread, as shown in Figure 1；Then screw thread mould clamping polytetrafluoroethyl-ne is used
At the internal screw thread of alkene blank, centering surplus is uniformly distributed, and polytetrafluoroethylene (PTFE) blank zero point of reference frame is located at the center of right side, puts down
End face is light-exposed, and using internal lathe-tool Vehicle Processing bore hole, turning, cutting, deburring, sharp edge are blunt；
Wherein, the size of internal screw thread is consistent with the size of screw thread mould.Because the spring collet carried on numerically controlled lathe is folder
It holds part closely to go deep into lathe abdomen, lathe process causes very big shadow to dimensional accuracy of the certain time length to final part
It rings, to overcome this phenomenon, using size and the consistent screw thread mould clamping polytetrafluoroethylene (PTFE) blank of internal screw thread gear, centering
Surplus is uniformly distributed, biggish to reduce machine tool system heat and cut influence of the heat to part, to improve the qualification rate of workpiece；
3) it cleans: after completion of processing, cleaning polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part with dehydrated alcohol and silk, pay attention to not
Allow to clean polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part using cotton；
4) examine: the polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part by step 3) cleaning is placed on 2~3h of constant temperature workshop, to poly-
It is measured again after tetrafluoroethene thin walled cylinder body class Part temperature is stablized and after identical as constant temperature workshop temperature, and constant temperature workshop temperature
Degree is 20 ± 5 DEG C；
The detailed process of detection are as follows: polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part inside and outside circle measures uniformly distributed 6~10 points and makes even
Mean value.
Embodiment 1
1) stress relief annealing and furnace cooling: polytetrafluoroethylene (PTFE) blank is heated to 170 DEG C in insulating box and is kept the temperature
Then 3h stress relief annealing cools to 25 DEG C with the furnace；
2) constant temperature Vehicle Processing: the polytetrafluoroethylene (PTFE) blank by step 1) processing machines to be formed in constant temperature workshop
Required polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part (as shown in Figure 2), the temperature of constant temperature workshop are 20 ± 5 DEG C；
The detailed process of constant temperature Vehicle Processing are as follows:
Centering polytetrafluoroethylene (PTFE) blank center, machining center φ 50 ± 0.5mm through-hole on numerically controlled lathe T65-L；Dress
Centering polytetrafluoroethylene (PTFE) blank outer circle is pressed from both sides, polytetrafluoroethylene (PTFE) blank zero point of reference frame is located at right side (according to the side in Fig. 1
To) at center, planar end surface is light-exposed, using 85 ± 0.5mm of the pre- bore hole φ of internal lathe-tool Vehicle Processing；Turn around clamping polytetrafluoroethylene (PTFE) hair
Blank, planar end surface is light-exposed, uses internal screw cutting tool Vehicle Processing M80 × 2 internal screw thread, such as Fig. 1 in polytetrafluoroethylene (PTFE) blank left end
It is shown；Then at the internal screw thread for using the screw thread of M80 × 2 mould clamping polytetrafluoroethylene (PTFE) blank, centering surplus is uniformly distributed, polytetrafluoro
Ethylene blank zero point of reference frame is located at the center of right side, and planar end surface is light-exposed, using internal lathe-tool Vehicle Processing bore hole φ 111 (+
0.8/-0.2) mm, turning guarantee size φ 120 (- 0.4/-0.8) mm, cutting, guarantee overall length 208.5 (+0.5/-0.3)
Mm, deburring, sharp edge fall blunt 0.5 × 45 °；
3) it cleans: after completion of processing, cleaning polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part with dehydrated alcohol and silk；
4) examine: the polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part by step 3) cleaning is placed on 2~3h of constant temperature workshop, to poly-
It is measured again after tetrafluoroethene thin walled cylinder body class Part temperature is stablized and after identical as constant temperature workshop temperature, and constant temperature workshop temperature
Degree is 20 ± 5 DEG C.
Comparative example 1
1) stress relief annealing and furnace cooling: polytetrafluoroethylene (PTFE) blank is heated to 170 DEG C in insulating box and is kept the temperature
Then 3h stress relief annealing cools to 25 DEG C with the furnace；
2) room temperature Vehicle Processing: the polytetrafluoroethylene (PTFE) blank by step 1) processing machines to form institute at normal temperature
The polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part needed, the temperature of room temperature are 30 DEG C；
The detailed process of constant temperature Vehicle Processing are as follows:
Centering polytetrafluoroethylene (PTFE) blank center, machining center φ 50 ± 0.5mm through-hole on numerically controlled lathe T65-L；Dress
Centering polytetrafluoroethylene (PTFE) blank outer circle is pressed from both sides, polytetrafluoroethylene (PTFE) blank zero point of reference frame is located at right side (according to the side in Fig. 1
To) at center, planar end surface is light-exposed, using 85 ± 0.5mm of the pre- bore hole φ of internal lathe-tool Vehicle Processing；Turn around clamping polytetrafluoroethylene (PTFE) hair
Blank, planar end surface is light-exposed, uses internal screw cutting tool Vehicle Processing M80 × 2 internal screw thread, such as Fig. 1 in polytetrafluoroethylene (PTFE) blank left end
It is shown；Then at the internal screw thread for using the screw thread of M80 × 2 mould clamping polytetrafluoroethylene (PTFE) blank, centering surplus is uniformly distributed, polytetrafluoro
Ethylene blank zero point of reference frame is located at the center of right side, and planar end surface is light-exposed, using internal lathe-tool Vehicle Processing bore hole φ 111 (+
0.8/-0.2) mm, turning guarantee size φ 120 (- 0.4/-0.8) mm, cutting, guarantee overall length 208.5 (+0.5/-0.3)
Mm, deburring, sharp edge fall blunt 0.5 × 45 °；
3) it cleans: after completion of processing, cleaning polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part with dehydrated alcohol and silk；
4) examine: the polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part by step 3) cleaning is cooled to room temperature 30 DEG C, then exists
30 DEG C of room temperature are detected.
The testing result of embodiment 1 and comparative example 1 is shown in Tables 1 and 2, and table 1 is the testing result statistical form of embodiment 1, table 2
For the testing result statistical form of comparative example 1.
Table 1
Table 2
Claims (6)
1. a kind of polytetrafluoroethylene (PTFE) thin walled cylinder body class method of processing parts, characterized by the following steps:
1) stress relief annealing and furnace cooling: polytetrafluoroethylene (PTFE) blank is heated to 160~180 DEG C in insulating box and is kept the temperature
2~4h stress relief annealing, then furnace cooling；
2) constant temperature Vehicle Processing: the polytetrafluoroethylene (PTFE) blank by step 1) processing is needed for constant temperature workshop is machined and to be formed
Polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part, the temperature of constant temperature workshop is 20 ± 5 DEG C；
3) it cleans: after completion of processing, with washes of absolute alcohol polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part；
4) examine: the polytetrafluoroethylene (PTFE) thin-wall sleeve tube kind part by step 3) cleaning is placed on constant temperature workshop, to polytetrafluoroethylene (PTFE)
Thin walled cylinder body class Part temperature stablize after and it is identical as constant temperature workshop temperature after measure again, and constant temperature workshop temperature be 20 ±
5℃。
2. polytetrafluoroethylene (PTFE) thin walled cylinder body class method of processing parts according to claim 1, it is characterised in that: the step 1)
In, cool to 20~33 DEG C with the furnace.
3. polytetrafluoroethylene (PTFE) thin walled cylinder body class method of processing parts according to claim 1, it is characterised in that: the step 2)
In, when environment temperature is at 15~25 DEG C, polytetrafluoroethylene (PTFE) blank size is controlled according to the middle difference of tolerance；When environment temperature is big
When 25 DEG C, polytetrafluoroethylene (PTFE) blank size is controlled according to the upper deviation of tolerance；When environment temperature is less than 15 DEG C, polytetrafluoro
Ethylene blank size is controlled according to the lower deviation of tolerance.
4. polytetrafluoroethylene (PTFE) thin walled cylinder body class method of processing parts according to claim 1, it is characterised in that: the step 2)
In, the detailed process of constant temperature Vehicle Processing are as follows:
Centering polytetrafluoroethylene (PTFE) blank center, the machining center through-hole on numerically controlled lathe；Clamping centering polytetrafluoroethylene (PTFE) blank
Part outer circle, polytetrafluoroethylene (PTFE) blank zero point of reference frame are located at the center of right side, and planar end surface is light-exposed, is added using internal lathe-tool vehicle
The pre- bore hole of work；Turn around clamping polytetrafluoroethylene (PTFE) blank, and planar end surface is light-exposed, uses internal screw thread in polytetrafluoroethylene (PTFE) blank left end
Lathe tool Vehicle Processing internal screw thread；Then at the internal screw thread for using screw thread mould clamping polytetrafluoroethylene (PTFE) blank, centering surplus is uniformly distributed,
Polytetrafluoroethylene (PTFE) blank zero point of reference frame is located at the center of right side, and planar end surface is light-exposed, using internal lathe-tool Vehicle Processing bore hole,
Turning, cutting, deburring, sharp edge are blunt.
5. polytetrafluoroethylene (PTFE) thin walled cylinder body class method of processing parts according to claim 1, it is characterised in that: the step 2)
In, revolving speed is 80~100r/min when polytetrafluoroethylene (PTFE) blank Vehicle Processing, feed of every rotation is 0.2~0.3mm.
6. polytetrafluoroethylene (PTFE) thin walled cylinder body class method of processing parts according to claim 4, it is characterised in that: the polytetrafluoro
The size of ethylene blank internal screw thread is consistent with the size of the screw thread mould.
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Application publication date: 20190111 |