CN106217730A - A kind of polytetrafluoroethylproducts products near-net-shape method and mould - Google Patents
A kind of polytetrafluoroethylproducts products near-net-shape method and mould Download PDFInfo
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- CN106217730A CN106217730A CN201610646673.3A CN201610646673A CN106217730A CN 106217730 A CN106217730 A CN 106217730A CN 201610646673 A CN201610646673 A CN 201610646673A CN 106217730 A CN106217730 A CN 106217730A
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- pressure head
- hole section
- shaped hole
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- small end
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000002994 raw material Substances 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 6
- 239000011799 hole material Substances 0.000 claims description 123
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims 1
- 238000003825 pressing Methods 0.000 abstract description 9
- 238000003754 machining Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 12
- 229950000845 politef Drugs 0.000 description 10
- 230000002093 peripheral effect Effects 0.000 description 8
- 238000003032 molecular docking Methods 0.000 description 7
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 210000005056 cell body Anatomy 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 150000001336 alkenes Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007723 die pressing method Methods 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical compound FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
- B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
Abstract
The invention discloses a kind of polytetrafluoroethylproducts products near-net-shape method and mould.In the method, raw material is by big end, the extruding in opposite directions of small end pressure head and form in the shaped hole section of die sleeve, i.e. by big end, the extruding in opposite directions of small end pressure head, by in the material extruding that is originally filled in stuffing hole section to shaped hole section, compressed together with the raw material being originally in shaped hole section and form blank product, and in the process, the stepped hole wall of shaped hole section and the big end cone platform of big side pressure head is utilized to coordinate, in pressing process, directly prepare the big end of product, thus avoid the waste of material and energy loss that machining is brought on bar blank, thus near-net-shape method has minimizing raw material loss in the present invention, the advantage improved production efficiency and product quality.
Description
Technical field
The present invention relates to a kind of polytetrafluoroethylproducts products near-net-shape method and mould.
Background technology
At present, both at home and abroad at rotary type politef pressing manufacture view, generally use upset pressure pressurization
The mould pressing method of power die forging, particularly in the manufacture of politef spout, use the most extensive.Existing polytetrafluoroethyl-ne
Alkene spout mainly by three kinds, is respectively as follows:
As it is shown in figure 1, the first politef spout includes body left small and right large, the big footpath section 101 of body and path section
By right-to-left tapered reducer 102 transition between 103, the outer peripheral face of reducer 102 and internal face are round and smooth
Curved surface；
As in figure 2 it is shown, the second politef spout includes body left small and right large, the big footpath section 201 of right section of body is certainly
The enlarging shape that from left to right gradually expands outwardly, the horn mouth that the path section 202 of left section of body is opened the most to the left for right-to-left
Shape, by throat 203 transition left small and right large between big footpath section 201 and the path section 202 of body, the internal face of throat 203 and
Outer peripheral face is smooth curved surface；
As it is shown on figure 3, the third politef spout includes right big left little body, the path section 302 of right section of body and a left side
The big footpath section 301 of section is between direct tube section, and big footpath section 301 and path section 302 by the reducing freely the most gradually expanded
Section 303 transition, internal face and the outer peripheral face of reducer 303 are taper seat.
The production procedure of this politef spout is: batch mixing molding sintering machining is cleared up
And packaging, the most more it is important that mold, sinter and cutting process.The mould used in die forming is by die sleeve, core
Axle and two pieces of pressure head compositions, wherein the internal face of die sleeve is inner cylinder face, and two pressure heads guiding movement vertically is assemblied in die sleeve
In, the cavity between two pressure heads is the forming cavity for raw material die forming, and the opposite face of two pressure heads is the shaping of plane form
End face.Coining process is two-sided method for press forming, comprises nine processing steps, and pressed ware is to weigh in 6.3kg
The politef of hollow-cylindrical molds revolving body blank product, and concrete mold process is as follows: charging (used time 20min), pressure
At the uniform velocity boosted 400kN, pressurize 20min through 5min by 0kN, through 5min at the uniform velocity pressure release to 0kN, turn-over 180 ° (used time about 20min),
Pressure is at the uniform velocity boosted 400kN, pressurize 20min through 5min by 0kN, through 5min at the uniform velocity pressure release to 0kN, the demoulding (used time 8min) and complete
Become, total used time 2h8min；Being sintered and machining, the raw material that this forming process not only expends is relatively big, and makes again
Product shape and machining inefficiency.It addition, in the die forming stage, carry out the side of extrusion molding from the two ends of blank product
Formula can cause the problem that in the middle part of blank product, organizational structure is destroyed, so after sintering and machining, and polytetrafluoroethylproducts products
The tapered sleeve section of finished product there will be the problem that intensity is not enough, reduces product quality.
Summary of the invention
It is an object of the invention to provide a kind of polytetrafluoroethylproducts products near-net-shape method reducing raw material loss, simultaneously
Present invention also offers a kind of polytetrafluoroethylproducts products shaping being exclusively used in and implementing this polytetrafluoroethylproducts products near-net-shape method
Mould.
In order to realize object above, in the present invention, the technical scheme of polytetrafluoroethylproducts products near-net-shape method is as follows:
Polytetrafluoroethylproducts products near-net-shape method, comprises the following steps:
Step one, is filled in raw material in die sleeve, and the endoporus of die sleeve has shaped hole section and the stuffing hole section of coaxial communication, shapes
Hole section is stepped hole, and stuffing hole section is straight hole, and raw material is full of stuffing hole section and shaped hole section, and is provided with at the two ends of die sleeve and is in
The small end pressure head of the small bore end of shaped hole section and be in the big side pressure head of small bore end of shaped hole section, the compression end of big side pressure head is convex
It is provided with the big end cone platform of inwall coaxial spaced with die sleeve, and big side pressure head and/or small end pressure head are can be in the endoporus of die sleeve
Seal the dynamic head slided；
Step 2, presses dynamic head so that big side pressure head compress end and small end pressure head compress end in die sleeve relative to phase
To movement, until big side pressure head arrives the large port of shaped hole section, small end pressure head arrives the portlet of shaped hole section, and stuffing hole
During in Duan, raw material is pressed completely into shaped hole section, so that raw material is squeezed into blank system by big end, small end pressure head in shaped hole section
Part.
In step one, in big side pressure head and small end pressure head one be dynamic head, another be in shaped hole section right
Answer the level pressure head in port；In step 2, by dynamic head is pressed to the direction near level pressure head so that big end, small end
Relative the moving towards of pressure head.
In the present invention, the technical scheme of polytetrafluoroethylproducts products near net forming mould is as follows:
It is exclusively used in the mould implementing polytetrafluoroethylproducts products near-net-shape method, including the die sleeve for containing raw material, die sleeve
Endoporus has shaped hole section and the stuffing hole section of coaxial communication, and shaped hole section is stepped hole, and stuffing hole section is straight hole；Also include using
In compressing the small end pressure head of raw material from the small bore end of shaped hole section and for from the big end of the tight raw material of macropore side pressure of shaped hole section
Pressure head, big side pressure head and/or small end pressure head are the dynamic head that can seal slip in the endoporus of die sleeve, and big end, small end pressure head
It is respectively provided with the compression end for compressing raw material, the compression end of big side pressure head is convexly equipped with and is inserted in die sleeve for coaxial spaced
Big end cone platform in hole.
Stuffing hole section is in one end of shaped hole section, and in big side pressure head and small end pressure head one be for self filler hole section
Seal slide in the corresponding ports of shaped hole section dynamic head, another be for being maintained in the corresponding ports of type hole section
Level pressure head.
Stuffing hole section is in the big end of shaped hole section, and described big side pressure head is the dynamic pressure that can seal slip in stuffing hole section
Head, small end pressure head is level pressure head.
Stuffing hole section is in the small end of shaped hole section, and described small end pressure head is the dynamic pressure that can seal slip in stuffing hole section
Head, big side pressure head is level pressure head.
Compressing of small end pressure head is convexly equipped with, on end, the small end frustum being inserted in the endoporus of die sleeve for coaxial spaced.
Also include the core bar for being coaxially installed in die sleeve, and offer on big end, small end pressure head and to be coaxially disposed
The guiding perforation installed for core bar pilot seal vertically.
Core bar is docked the most successively by point body of rod that two joints are above and forms.
Die sleeve includes that the sleeve that two or more is coaxial docking, described shaped hole section are in each sleeve in one, stuffing hole
Section is combined by the endoporus of remaining sleeve.
In the present invention, raw material is that shaped hole section at die sleeve forms by big end, the extruding in opposite directions of small end pressure head
, i.e. by big end, the extruding in opposite directions of small end pressure head, the material extruding being filled in stuffing hole section by script is to shaped hole section
In, compressed together with the raw material being originally in shaped hole section and form blank product, and in the process, utilize shaped hole
The stepped hole wall of section and the big end cone platform of big side pressure head coordinate, and directly prepare the big end of product in pressing process, thus keep away
Exempt from machining is brought on bar blank waste of material and energy loss, thus in the present invention, near-net-shape method has had
The advantage reduce raw material loss, improving production efficiency and product quality.
Accompanying drawing explanation
Fig. 1 is the structural representation of the first polytetrafluoroethylproducts products in prior art；
Fig. 2 is the structural representation of the second polytetrafluoroethylproducts products in prior art；
Fig. 3 is the structural representation of the third polytetrafluoroethylproducts products in prior art；
Fig. 4 is the structural representation of the Die Embodiment 1 of the present invention；
Fig. 5 is the schematic diagram of product sample point in the embodiment of the near-net-shape method that mould is corresponding in Fig. 4；
Fig. 6 be in Fig. 5 product and the traditional product density comparison diagram at sample point (transverse axis represents that sample point, the longitudinal axis represent close
Degree)；
Fig. 7 be in Fig. 5 product and the traditional product hot strength comparison diagram at sample point (transverse axis represents sample point, longitudinal axis table
Show hot strength)；
Fig. 8 be in Fig. 5 product and the traditional product breakdown strength comparison diagram at sample point (transverse axis represents sample point, longitudinal axis table
Show breakdown strength)；
Fig. 9 is the structural representation of the Die Embodiment 2 of the present invention；
Figure 10 is the structural representation of the Die Embodiment 3 of the present invention.
Detailed description of the invention
The embodiment 1 of polytetrafluoroethylproducts products near net forming mould in the present invention: this mould is primarily adapted for use in preparation first
Planting polytetrafluoroethylproducts products, as shown in Figure 4, this mould is mainly made up of die sleeve, small end pressure head 4, big side pressure 1 and core bar.
Die sleeve is made up of the upper bush 9 being coaxial docking from top to bottom, middle sleeve 7 and lower sleeve 3.Upper bush 9, middle sleeve 7
Two butt ends adjacent with in lower sleeve 3 offer on the periphery of one, lower end the lower docking seam of annular, one, upper end
Offer on inwall and coincide to slotting upper docking seam with the lower seam that docks, with inserting by upper docking seam and lower docking seam
Set coordinates, it is achieved upper bush 9, middle sleeve 7 and lower sleeve 3 are in axial removable docking.Upper bush 9, middle sleeve 7 and lower sleeve 3
Periphery on be all welded with the handle 11 being arranged symmetrically in its opposite sides.Lower sleeve 3 is the bottom being in each sleeve
Termination body, the internal diameter of remaining sleeve is equal to the internal diameter that lower sleeve 3 is held greatly, and the endoporus of lower sleeve 3 is and blank product
Shape coincide complementary shaped hole section, this shaped hole section is up big and down small stepped hole, the aperture section of stepped hole and macropore section
Between the taper hole section transition that is gradually reduced by aperture from top to bottom, the wall surface of the hole of taper hole section is inwardly protruded curved wall,
Taper hole section and aperture section are in lower sleeve 3, and taper hole section is in the middle part of lower sleeve 3, lower sleeve 3 be in taper hole section with
On the lower part that part is macropore section.This shaped hole section is by the big side pressure head accommodating section set gradually from top to bottom, shaped segment
Forming with small end pressure head accommodating section, the biggest side pressure head accommodating section is used for accommodating big side pressure 1, and small end pressure head accommodating section is used for holding
Receive small end pressure head 4, the wall surface of the hole of shaped segment for the outer peripheral face of blank product 2 coincide and coordinate.Middle sleeve 7 and lower sleeve 3
Endoporus combination formed stuffing hole section, this stuffing hole section is the straight hole that aperture is equal with the aperture of the macropore section of shaped hole section, fills out
The effect of material hole section is that raw material adds fashionable receiving and is in the raw material beyond shaped hole section, is equal to accommodate shaped hole section to be pressed into
In raw material.
Core bar by guide head 10, above divide the body of rod 8, in point body of rod 6 and the lower point of body of rod 5 dock the most successively and form.Lead
To 10, above divide the body of rod 8, in point body of rod 6 and the lower point of body of rod 5 be coaxially arranged with on the opposite end of adjacent two be respectively in
The axle head plug of end and be in the axle head jack of lower end, axle head plug is threaded in axle head jack, saves it realizing each bar
Between removable be connected.The bar length of the upper point of body of rod 8 equal to the length of upper bush 9, in the bar length of point body of rod 6 equal to the length of middle sleeve 7
Degree, the bar length of the lower point of body of rod 5 is equal to the length of lower sleeve 3.Core bar is coaxially installed on the center of die sleeve, and the effect of core bar is to little
The pressure head of side pressure 4, big side pressure 1 and forcing press provides location and guides.
Small end pressure head 4 is arranged in the aperture, lower end of the aperture section of lower sleeve 3, and the center of small end pressure head 4 offers for core
Bar guides the lower guiding perforation of insertion vertically, and the outer peripheral face of small end pressure head 4 coincide with the wall surface of the hole of aperture section and is affixed, to ensure
Small end pressure head 4 guides in the aperture, lower end of the aperture section being assemblied in lower sleeve 3 vertically.The lower ring end face of small end pressure head 4 and mould
The ring end face of set lower end is concordant, the plane that compression end face is the ring end face for forming workblank product 2 lower end of small end pressure head 4,
The i.e. upper end of this small end pressure head 4 is the plane pressed end for arranging towards big side pressure 1 after loading die sleeve.
Big side pressure 1 is arranged in the macropore section of die sleeve, and the center of big side pressure 1 offers and guides shifting vertically for core bar
The dynamic upper guiding perforation installed.Big side pressure 1 is divided into the guide holder set gradually from top to bottom, caudal peduncle section with its profile and holds greatly
Frustum, wherein the outer peripheral face of guide holder is identical with the wall surface of the hole of macropore section is affixed, to ensure that guide holder guiding movement vertically fills
Fit in macropore section；The coaxial projection of caudal peduncle section is in the lower end of guide holder, and caudal peduncle section is the cylinder thinner than guide holder, and caudal peduncle section is used
In the upper end inserting raw material, and form columned upper port in the upper end of blank product 2；Big end cone platform is in big side pressure head
The compression end of 1, and big end cone platform is the cone that external diameter is gradually reduced from top to bottom, the outer peripheral face of big end cone platform is outwardly convex
Cambered surface, the wall surface of the hole of the outer peripheral face of this big end cone platform and taper hole section coordinates, to ensure that the reducer of blank product 2 is and product
Consistent.
The polytetrafluoroethylproducts products near-net-shape method that in the present embodiment, the operation principle of mould is as described below.
The embodiment 1 of the polytetrafluoroethylproducts products near-net-shape method of the present invention: the method is poly-in order to prepare the first
The blank product of tetrafluoroethene goods, the mould of employing is mould in Die Embodiment 1, and the method comprises the following steps:
1, raw material is loaded in mould, polytetrafluoroethylproducts products near net forming mould in the structure of mould such as above-described embodiment,
After raw material loads, small end pressure head is positioned on the workbench of forcing press, so that small end pressure head and die sleeve keep being relatively fixed, and
The big side pressure head of mould is fixed on the head of forcing press；
2, start forcing press, in the case of small end pressure head and die sleeve remain stationary as on the table, head drives big side pressure
Head presses downwards raw material, until big raw material between side pressure head and small end pressure head is pressed into blank product, this blank product has
Having big footpath section, reducer and the path section set gradually from top to bottom, the external diameter of big footpath section is bigger than the external diameter of path section, and reducing
The external diameter arrogant footpath section of section is gradually reduced to path section；
3, after blank product is removed from the molds, blank product is sintered and machining successively, until by blank system
Part is processed into product.
As a example by the raw material of 4.4kg, the technique duration of above-mentioned processing step is: feed in step one, used time 10mi；?
In step 2, pressure is at the uniform velocity boosted 350kN, pressurize 20min through 5min by 0kN；In step 3, through 5min at the uniform velocity pressure release extremely
0MPa, the demoulding (used time 5min) and complete, total used time 45min.This processing step charging more convenient, and save turn-over and another
The time of face compacting, and be convenient in demoulding, therefore it is greatly improved compacting production efficiency.
The key performance detection of the product that product obtained by method prepares with traditional handicraft and contrast in the present embodiment, as
Shown in Fig. 5 to Fig. 8, wherein A represents the product that traditional handicraft prepares, and B represents the product in the present embodiment obtained by method.Survey makes
Stretching with two kinds of distinct methods and the density uniformity of the polytetrafluoroethylproducts products each several part of mould acquisition, solution soma is strong
Degree, the electrical strength of solution soma, and carry out the industrial frequency withstand voltage test of polytetrafluoroethylproducts products.
1. density uniformity: respectively choose 5 samples from position, three, politef pressing upper, middle and lower respectively, respectively
Carrying out 1 test, test by GB/T 1033.1-2008 5.1 methods described, impregnation liquid is water, and test temperature is 23
± 2 DEG C, calculate the density of sample according to GB/T 1033.1-2008 Chinese style 2, average；
2. hot strength: test according to the in GB/T 2567-2008 the 5.1st article, tests temperature 23 ± 2 DEG C, rate of extension
5mm/min, tests 5 samples, averages；
3. electrical strength；Test according in GB/T 1408-2006 10.1 methods described, specimen finish 100mm, thickness
1mm, tests temperature 23 ± 2 DEG C, carries out, rate of pressure rise 500V/s, use two symmetric flat panel electrodes in 0.4MPa SF6 gas,
Test 5 samples, average.
4. industrial frequency withstand voltage test: politef pressing is carried out 750kV/1min pressure test, it is desirable to during
Without flashover and punch-through.
Experimental result:
Density uniformity contrasts: see Fig. 6；
Hot strength contrasts: see Fig. 7；
Breakdown strength contrasts；See Fig. 8.
As can be seen here, the politef that near-net-shape drawing method and mould obtain is used with use traditional pressing methods
Pressing density uniformity, electric property, mechanical performance are substantially suitable, but stock utilization, production efficiency are all greatly improved,
Every year can be cost-saved 683.4 ten thousand yuan, die forming operation improving productivity 183.99% simultaneously, machining operation is raw
Produce improved efficiency 75%.The type near-net-shape method also can manufacture field (such as thermoplastic by popularization and application to other nonmetal parts
Property engineering plastics etc.), produce bigger economic benefit.
The embodiment 2 of polytetrafluoroethylproducts products near net forming mould in the present invention in the present invention: the present embodiment and embodiment 1
Difference be, as it is shown in figure 9, this mould is primarily adapted for use in the blank product preparing the second polytetrafluoroethylproducts products, small end
The end that compresses of pressure head 24 is convexly equipped with the small end frustum 24 in the endoporus being coaxially inserted into lower sleeve 23, the effect of this small end frustum 24
It it is the small end horn mouth of extrusion blank product 22.
The embodiment 2 of the polytetrafluoroethylproducts products near-net-shape method of the present invention: the present embodiment exists with the difference of embodiment 1
In, the method is primarily adapted for use in the blank product preparing the second polytetrafluoroethylproducts products, and the mould of employing is Die Embodiment 2
Middle mould, mold use step is same as in Example 1, does not repeats them here.
The embodiment 3 of polytetrafluoroethylproducts products near net forming mould in the present invention in the present invention: the present embodiment and embodiment 1
Difference be, as shown in Figure 10, this mould is primarily adapted for use in the blank product 32 preparing the third polytetrafluoroethylproducts products, under
Sleeve 33 is inverted so that the small end of the shaped hole section in lower sleeve 33 upper, big end under, corresponding big side pressure 31 is for being in
Level pressure head bottom die sleeve, small end pressure head 34 is to be in the dynamic head above big side pressure 31；Meanwhile, middle sleeve 37 and upper bush
The barrel dliameter of 39 reduces so that the internal diameter of middle sleeve 37 and upper bush 39 is equal to the small end aperture of shaped hole section.
The embodiment 3 of the polytetrafluoroethylproducts products near-net-shape method of the present invention: the present embodiment exists with the difference of embodiment 1
In, the method is primarily adapted for use in the blank product preparing the third polytetrafluoroethylproducts products, and the mould of employing is Die Embodiment 3
Middle mould, mold use step is also utilized in the case of level pressure head remains stationary as, pressing dynamic head from top to bottom, at this
Repeat no more.
Other embodiments of polytetrafluoroethylproducts products near net forming mould in the present invention: this die sleeve can also use point lobe to spell
Conjunction or monolithic construction etc..It addition, taper hole section both may be at bottommost in this die sleeve, it is also possible to belong to middle and top,
So can realize raw material by the forms of motion of change die sleeve and two pressure heads to shape at taper hole section.
Other embodiments of polytetrafluoroethylproducts products near-net-shape method in the present invention: from the technique of top die pressing formation also
Can more become carrying out from bottom surface or from two sides simultaneously, or even the mode of two sides die forming after employing upset.
From other embodiments above-mentioned, in the present invention, polytetrafluoroethylproducts products near-net-shape method can be in accordance with the following steps
Implement:
Step one, is filled in raw material in die sleeve, and the endoporus of die sleeve has shaped hole section and the stuffing hole section of coaxial communication, shapes
Hole section is stepped hole, and stuffing hole section is straight hole, and raw material is full of stuffing hole section and shaped hole section, and is provided with at the two ends of die sleeve and is in
The small end pressure head of the small bore end of shaped hole section and be in the big side pressure head of small bore end of shaped hole section, the compression end of big side pressure head is convex
It is provided with the big end cone platform of inwall coaxial spaced with die sleeve, and big side pressure head and/or small end pressure head are can be in the endoporus of die sleeve
Seal the dynamic head slided；
Step 2, presses dynamic head so that big side pressure head compress end and small end pressure head compress end in die sleeve relative to phase
To movement, until big side pressure head arrives the large port of shaped hole section, small end pressure head arrives the portlet of shaped hole section, and stuffing hole
During in Duan, raw material is pressed completely into shaped hole section, so that raw material is squeezed into blank system by big end, small end pressure head in shaped hole section
Part.
Claims (10)
1. polytetrafluoroethylproducts products near-net-shape method, it is characterised in that comprise the following steps:
Step one, is filled in raw material in die sleeve, and the endoporus of die sleeve has shaped hole section and the stuffing hole section of coaxial communication, shapes
Hole section is stepped hole, and stuffing hole section is straight hole, and raw material is full of stuffing hole section and shaped hole section, and is provided with at the two ends of die sleeve and is in
The small end pressure head of the small bore end of shaped hole section and be in the big side pressure head of small bore end of shaped hole section, the compression end of big side pressure head is convex
It is provided with the big end cone platform of inwall coaxial spaced with die sleeve, and big side pressure head and/or small end pressure head are can be in the endoporus of die sleeve
Seal the dynamic head slided；
Step 2, presses dynamic head so that big side pressure head compress end and small end pressure head compress end in die sleeve relative to phase
To movement, until big side pressure head arrives the large port of shaped hole section, small end pressure head arrives the portlet of shaped hole section, and stuffing hole
During in Duan, raw material is pressed completely into shaped hole section, so that raw material is squeezed into blank system by big end, small end pressure head in shaped hole section
Part.
Polytetrafluoroethylproducts products near-net-shape method the most according to claim 1, it is characterised in that in step one, greatly
In side pressure head and small end pressure head one for dynamic head, another be the level pressure head being in the corresponding ports of shaped hole section；In step
In rapid two, by dynamic head is pressed to the direction near level pressure head so that big end, relative the moving towards of small end pressure head.
3. be exclusively used in the mould implementing polytetrafluoroethylproducts products near-net-shape method as described in claim 1, including for
Containing the die sleeve of raw material, the endoporus of die sleeve has shaped hole section and the stuffing hole section of coaxial communication, and shaped hole section is stepped hole, fills out
Material hole section is straight hole；Also include for compressing the small end pressure head of raw material from the small bore end of shaped hole section and for from shaped hole section
The big side pressure head of the tight raw material of macropore side pressure, big side pressure head and/or small end pressure head are to seal moving of slip in the endoporus of die sleeve
Pressure head, and end, small end pressure head are respectively provided with the compression end for compressing raw material greatly, the compression end of big side pressure head are convexly equipped with for same
The between centers big end cone platform in the endoporus being inserted into die sleeve.
Mould the most according to claim 3, it is characterised in that stuffing hole section is in one end of shaped hole section, and big side pressure
In head and small end pressure head one be for the sealing of self filler hole section slide into the dynamic head in the corresponding ports of shaped hole section, another
Individual for the level pressure head in the corresponding ports for being maintained at type hole section.
Mould the most according to claim 4, it is characterised in that stuffing hole section is in the big end of shaped hole section, described big end
Pressure head is the dynamic head that can seal slip in stuffing hole section, and small end pressure head is level pressure head.
Mould the most according to claim 4, it is characterised in that stuffing hole section is in the small end of shaped hole section, described small end
Pressure head is the dynamic head that can seal slip in stuffing hole section, and big side pressure head is level pressure head.
Mould the most according to claim 6, it is characterised in that be convexly equipped with for coaxial spaced on the compression end of small end pressure head
The small end frustum being inserted in the endoporus of die sleeve.
8. according to the mould described in any one in claim 3 to 6, it is characterised in that also include for being coaxially installed on mould
Core bar in set, and on big end, small end pressure head, offer the guiding installed for core bar pilot seal vertically being coaxially disposed
Perforation.
Mould the most according to claim 8, it is characterised in that core bar is the most right by point body of rod that two joints are above
Connect and form.
10. according to the mould described in any one in claim 3 to 6, it is characterised in that die sleeve includes that two or more is the most right
The sleeve connect, described shaped hole section is in each sleeve in one, and stuffing hole section is combined by the endoporus of remaining sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610646673.3A CN106217730B (en) | 2016-08-09 | 2016-08-09 | A kind of polytetrafluoroethylproducts products near-net-shape method and mold |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610646673.3A CN106217730B (en) | 2016-08-09 | 2016-08-09 | A kind of polytetrafluoroethylproducts products near-net-shape method and mold |
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| CN106217730B CN106217730B (en) | 2018-09-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113508018A (en) * | 2018-12-10 | 2021-10-15 | 萨克米伊莫拉机械合作社合作公司 | Apparatus and method for forming a concave article |
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| US11806914B2 (en) | 2018-12-10 | 2023-11-07 | Sacmi Cooperativa Meccanici Imola Societa' Cooperativa | Apparatus and method for forming a concave object |
| CN113508018B (en) * | 2018-12-10 | 2024-04-26 | 萨克米伊莫拉机械合作社合作公司 | Apparatus and method for forming concave articles |
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| Publication number | Publication date |
|---|---|
| CN106217730B (en) | 2018-09-04 |
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