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 PDF

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Publication number
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
ptfe
blank
processing
constant temperature
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CN201811320353.4A
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Chinese (zh)
Inventor
陈妍
胡卫华
曾永春
韩庆波
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Hubei Sanjiang Space Jiangbei Mechanical Engineering Co Ltd
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Hubei Sanjiang Space Jiangbei Mechanical Engineering Co Ltd
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Priority to CN201811320353.4A priority Critical patent/CN109175920A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)

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

Polytetrafluoroethylene (PTFE) thin walled cylinder body class method of processing parts
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.
CN201811320353.4A 2018-11-07 2018-11-07 Polytetrafluoroethylene (PTFE) thin walled cylinder body class method of processing parts Pending CN109175920A (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102626848A (en) * 2012-03-31 2012-08-08 湖北三江航天江北机械工程有限公司 Processing method of flexible nozzle thin-wall dual-spherical reinforcing part and device thereof
CN104923806A (en) * 2015-06-16 2015-09-23 湖北三江航天江北机械工程有限公司 Thin-walled polytetrafluoroethylene sealing ring machining method
CN105328409A (en) * 2015-10-28 2016-02-17 湖北三江航天红阳机电有限公司 Method for machining thin-wall sleeve type part through wedge type inner supporting mechanism
CN105364418A (en) * 2015-12-07 2016-03-02 西安航空动力控制科技有限公司 Method for machining Teflon thin-wall spiral part
CN105414563A (en) * 2015-12-03 2016-03-23 湖北三江航天红阳机电有限公司 Machining method of cylindrical thin-wall rotary part with wavy axial section
CN206282169U (en) * 2016-12-27 2017-06-27 安徽理工大学 A kind of constant temperature workshop automatic management device
CN107175465A (en) * 2017-05-18 2017-09-19 济南重工股份有限公司 The processing technology of typical large diameter thin wall part
CN107457413A (en) * 2017-09-07 2017-12-12 天津津航技术物理研究所 A kind of turning preparation method of optical element sphere lap

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102626848A (en) * 2012-03-31 2012-08-08 湖北三江航天江北机械工程有限公司 Processing method of flexible nozzle thin-wall dual-spherical reinforcing part and device thereof
CN104923806A (en) * 2015-06-16 2015-09-23 湖北三江航天江北机械工程有限公司 Thin-walled polytetrafluoroethylene sealing ring machining method
CN105328409A (en) * 2015-10-28 2016-02-17 湖北三江航天红阳机电有限公司 Method for machining thin-wall sleeve type part through wedge type inner supporting mechanism
CN105414563A (en) * 2015-12-03 2016-03-23 湖北三江航天红阳机电有限公司 Machining method of cylindrical thin-wall rotary part with wavy axial section
CN105364418A (en) * 2015-12-07 2016-03-02 西安航空动力控制科技有限公司 Method for machining Teflon thin-wall spiral part
CN206282169U (en) * 2016-12-27 2017-06-27 安徽理工大学 A kind of constant temperature workshop automatic management device
CN107175465A (en) * 2017-05-18 2017-09-19 济南重工股份有限公司 The processing technology of typical large diameter thin wall part
CN107457413A (en) * 2017-09-07 2017-12-12 天津津航技术物理研究所 A kind of turning preparation method of optical element sphere lap

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Application publication date: 20190111