CN202985907U

CN202985907U - Production device of hollow polytetrafluoroethylene (PTFE) part with built-in annular magnet

Info

Publication number: CN202985907U
Application number: CN 201220742355
Authority: CN
Inventors: 杨文光; 孙克原; 靳予; 陈卓; 毛志杰
Original assignee: NANJING COMPTECH NEW MATERIAL CO Ltd; NANJING KENTE COMPOSITE MATERIAL CO Ltd
Current assignee: NANJING COMPTECH NEW MATERIAL CO Ltd; NANJING KENTE COMPOSITE MATERIAL CO Ltd
Priority date: 2012-12-30
Filing date: 2012-12-30
Publication date: 2013-06-12
Anticipated expiration: 2022-12-30

Abstract

The utility model provides a production device of a hollow polytetrafluoroethylene (PTFE) part with a built-in annular magnet. According to the hollow PTFE part with the built-in annular magnet, the magnet can be positioned accurately, the PTFE and the magnet are tightly combined and the PTFE does not crack. In the production device, through holes inosculated with the outer periphery of the part are formed in a die sleeve; the outer periphery of a mandrel is inosculated with the hollow part of the part; the outer periphery of an inner sleeve is inosculated with the inner hole of the annular magnet; the inner periphery of the inner sleeve is inosculated with the outer periphery of the die sleeve; the outer periphery of the outer sleeve is inosculated with the through holes of the die sleeve; the inner periphery of the outer sleeve is inosculated with the outer periphery of the annular magnet; the outer periphery of a middle sleeve is inosculated with the outer periphery of the annular magnet; the inner periphery of the middle sleeve is inosculated with the inner hole of the annular magnet; the outer periphery of a lower cushion block is inosculated with the through hole of the die sleeve; holes inosculated with the mandrel are formed in the lower cushion block; the outer periphery of an upper pressure head is inosculated with the through holes of the die sleeve; upper guide holes are formed in the upper pressure head; the outer periphery of a lower pressure head is inosculated with the through holes of the die sleeve; and lower guide holes are formed in the lower pressure head.

Description

The hollow PTFE part process units of embedded annular magnet

Technical field

Present technique relates to the process units of the hollow PTFE part of embedded annular magnet.

Background technology

Polytetrafluoroethylene (PTFE) (PTFE) is a kind of engineering plastics of excellent performance.Corrosion resistance, resistant of high or low temperature, resistance to ag(e)ing, low frictional properties, dielectricity, non-viscosity, physiology inertia that PTFE is good make it become indispensable special material in various fields such as chemical industry, machinery, electric, building, medical treatment.Although PTFE is thermoplastic resin, but because it has high melt viscosity, be difficult to the method for the thermoplastic of standard, it be carried out machine-shaping, the production method that can only adopt the metallurgical cold moudling of like powder to combine with sintering, and pulverous PTFE is put into the shaping mould extrusion forming, and then the model of moulding is put into sintering furnace heat-agglomerating get final product.

For some, the occasion of specific use is arranged, need to be embedded at hollow PTFE an annular magnet, this magnet does not leak outside.Usually, the PTFE part of this embedded annular magnet is a hollow cylinder, and circular ring magnet is coaxial with hollow cylinder.Hollow PTFE part for embedded annular magnet, if according to similar common PTFE production method, magnet and pulverous PTFE are put into the shaping mould extrusion forming together, and then the model of the embedded magnet of moulding is put into sintering furnace heat-agglomerating, two problems can appear: the one, and the gap can appear at magnet and PTFE joint portion, cracking can occur at the PTFE of magnet corner section, cause part defective.The 2nd, magnet Randomness of position in part is large, can't accurately locate.

Technology contents

The purpose of present technique is to provide a kind of hollow PTFE part process units of embedded annular magnet, uses the hollow PTFE part of the embedded annular magnet of this device production, the magnet accurate positioning, and PTFE is combined with magnet closely, and PTFE can not ftracture.

The hollow PTFE part process units of this embedded annular magnet comprises die sleeve, core, inner sleeve, outer sleeve, intermediate sleeve, lower cushion block, seaming chuck, push-down head;

Die sleeve has the through hole that the periphery with part matches, and the periphery of core and the hollow part of part match; The periphery of inner sleeve and the endoporus of annular magnet match, and the interior week of inner sleeve and the periphery of core match; The periphery of outer sleeve and the through hole of die sleeve match, and the interior week of outer sleeve and the periphery of annular magnet match; The periphery of intermediate sleeve and the periphery of annular magnet match, and the interior week of intermediate sleeve and the endoporus of annular magnet match; The periphery of lower cushion block and the through hole of die sleeve match, and have the hole that matches with core on lower cushion block; The periphery of seaming chuck and the through hole of die sleeve match, and have on seaming chuck with core and go up pilot hole accordingly; The periphery of push-down head and the through hole of die sleeve match, and have on push-down head with core and descend pilot hole accordingly.

The production method of using said apparatus to produce the hollow PTFE part of embedded annular magnet comprises the following steps:

A, lower cushion block is placed in the through hole of die sleeve, the lower surface of inner sleeve and magnet all contacts with the upper surface of lower cushion block, magnet is sleeved on inner sleeve, core passes in the hole that inner sleeve extend into lower cushion block, intermediate sleeve is sleeved on outside inner sleeve, and the lower surface of intermediate sleeve contacts with the magnet upper surface;

B, first's PTFE powder is added between intermediate sleeve and die sleeve, the PTFE of the first powders compression that adds, the upper surface that makes the PTFE of the first powder after compacting is concordant with the magnet upper surface with the lower surface of outer sleeve;

C, taking-up inner sleeve add second portion PTFE powder between intermediate sleeve and core; In the situation that outer sleeve and first's PTFE powder upper surface keep in touch, second portion PTFE powders compression, the upper end that makes the second portion PTFE powder after compacting is concordant with the magnet upper surface with the lower surface of inner sleeve;

D, taking-up inner sleeve, outer sleeve, intermediate sleeve, lower cushion block;

E, add respectively third and fourth part PTFE powder between the die sleeve of both sides, magnet upper and lower end face and core, simultaneously to third and fourth part PTFE powders compression, obtain the semi-finished product of PTFE powder wrapped magnet with the seaming chuck that passes core and push-down head;

F, semi-finished product are taken out from die sleeve put into the sintering furnace sintering; During sintering, pressurizeed in half-finished upper and lower end face.

The beneficial effect of present technique: when using this process units to produce the hollow PTFE part of embedded annular magnet, in compression PTFE powder process, magnet is by the reliable location such as inner sleeve, outer sleeve, intermediate sleeve, lower cushion block, and the position can not be moved, so magnet accurate positioning in the part that makes.The PTFE powder is divided into a plurality of Partial shrinkages, perhaps guaranteed the uniformity of part each several part PTFE powders compression, especially guaranteed with the contacted PTFE powder of magnet edge reliably compressed, may make part PTFE density everywhere basic identical, so do not have PTFE and magnet joint portion the gap to occur after sintering and occur the phenomenon of cracking at the PTFE of magnet corner section.

The hollow PTFE part process units of above-mentioned embedded annular magnet, it also comprises pressue device, pressue device comprises clamp body, be provided with the top board and the lower platen that slide up and down with respect to clamp body on clamp body, all have elastic force apparatus (as Compress Spring) between top board and lower platen and clamp body.

During sintering, use pressue device to be pressurizeed in half-finished upper and lower end face like this.Top board contacts respectively with half-finished upper and lower end face with lower platen, semi-finished product is pressurizeed with top board and lower platen by elastic force apparatus.Pressurize when sintering like this, perhaps can be in confined state all the time and make PTFE have mobility by PTFE in sintering process, prevented that further cracking and gap from appearring in PTFE.

Description of drawings

Fig. 1 positions the schematic diagram of state to magnet.

Fig. 2 is the reinforced view in magnet outer ring.

Fig. 3 is view after the reinforced compression in magnet outer ring.

Fig. 4 takes out the inner sleeve view.

Fig. 5 is the reinforced view of magnet inner ring.

Fig. 6 is view after the reinforced compression of magnet inner ring.

Fig. 7 is the reinforced view of magnet upper and lower side.

Fig. 8 is view after the reinforced compression of magnet upper and lower side.

Fig. 9 puts into the chemicals dosing plant schematic diagram to semi-finished product.

Embodiment

Below in conjunction with the drawings and specific embodiments, present technique is described further.

The hollow cylinder PTFE part process units of embedded circular ring magnet referring to Fig. 1,2,7-9, comprises die sleeve 1, core 2, inner sleeve 3, outer sleeve 4, intermediate sleeve 5, lower cushion block 6, seaming chuck 7, push-down head 8, pressue device 9 etc.Referring to Fig. 9, pressue device 9 comprises clamp body 90, is provided with the top board 91 and the lower platen 92 that slide up and down with respect to clamp body on clamp body 90, all has high temperature resistant Compress

Spring

93,94 between top board and lower platen and clamp body.

Die sleeve 1 has the through hole 11 that the periphery with part 20 matches, and the hollow part 22 of the periphery of core 2 and part 20 matches; The periphery of inner sleeve 3 and the endoporus of annular magnet match, and the interior week of inner sleeve and the periphery of core match; The periphery of outer sleeve 4 and the through hole of die sleeve match, and the interior week of outer sleeve 4 and the periphery of annular magnet 30 match; The periphery of the periphery of intermediate sleeve 5 and annular magnet 30 matches, and the interior week of intermediate sleeve and the endoporus of annular magnet match; The periphery of lower cushion block and the through hole of die sleeve match, and have the hole 61 that matches with core on lower cushion block.The periphery of seaming chuck 7 and the through hole of die sleeve match, and have on seaming chuck with core to go up pilot hole 71 accordingly; The periphery of push-down head 8 and the through hole of die sleeve match, and have on push-down head with core to descend pilot hole 81 accordingly.

The production method of the hollow cylinder PTFE part of embedded circular ring magnet:

A, magnet are located: referring to Fig. 1, lower cushion block is placed in the through hole of die sleeve, the lower surface of inner sleeve and magnet all contacts with the upper surface of lower cushion block, magnet is sleeved on inner sleeve, core passes in the hole that inner sleeve extend into lower cushion block, intermediate sleeve is sleeved on outside inner sleeve, and the lower surface of intermediate sleeve contacts with the magnet upper surface.

B, the reinforced compression in magnet outer ring: referring to Fig. 2,3, the PTFE of first powder 100 is added between intermediate sleeve and die sleeve, with the lower surface of outer sleeve the PTFE of the first powders compression that adds, pressure is 28 MPa, and the upper surface that makes the PTFE of the first powder after compacting is concordant with the magnet upper surface;

C, the reinforced compression of magnet inner ring: referring to 4-6, take out inner sleeve, second portion PTFE powder 200 is added between intermediate sleeve and core; In the situation that outer sleeve and first's PTFE powder upper surface keep in touch, second portion PTFE powders compression, pressure is 27 MPa with the lower surface of inner sleeve, and the upper end that makes the second portion PTFE powder after compacting is concordant with the magnet upper surface;

E, the reinforced compression of magnet upper and lower side: referring to Fig. 7,8, add respectively third and fourth part PTFE powder 300,400 between the die sleeve of both sides, magnet upper and lower end face and core, with the seaming chuck that passes core and push-down head simultaneously to third and fourth part PTFE powders compression, pressure is 28 MPa, obtains the semi-finished product 23 of PTFE powder wrapped magnet;

F, pressure sintering: referring to Fig. 9, semi-finished product are taken out from die sleeve, put into pressue device, top board contacts respectively with half-finished upper and lower end face under the effect of Compress Spring with lower platen.Pressue device and semi-finished product are put into the sintering furnace sintering together.During sintering, be warming up to 380 ℃ of sintering temperatures from normal temperature with 70 ℃/hour, temperature retention time 4 hours; Then naturally cooling.The hollow cylinder PTFE part inside and outside of the embedded circular ring magnet that obtains is without cracking phenomena, PTFE and magnet close contact.

Certainly, push-down head 8 can be same part with lower cushion block 6.

Claims

1. the hollow PTFE part process units of embedded annular magnet, is characterized in that: comprise die sleeve, core, inner sleeve, outer sleeve, intermediate sleeve, lower cushion block, seaming chuck, push-down head;

2. the hollow PTFE part process units of embedded annular magnet as claimed in claim 1, it is characterized in that: further comprising pressue device, pressue device comprises clamp body, be provided with the top board and the lower platen that slide up and down with respect to clamp body on clamp body, all have elastic force apparatus between top board and lower platen and clamp body.

3. the hollow PTFE part process units of embedded annular magnet as claimed in claim 2, it is characterized in that: elastic force apparatus is Compress Spring.