CN106217730B - A kind of polytetrafluoroethylproducts products near-net-shape method and mold - Google Patents
A kind of polytetrafluoroethylproducts products near-net-shape method and mold Download PDFInfo
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- CN106217730B CN106217730B CN201610646673.3A CN201610646673A CN106217730B CN 106217730 B CN106217730 B CN 106217730B CN 201610646673 A CN201610646673 A CN 201610646673A CN 106217730 B CN106217730 B CN 106217730B
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- end pressure
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000002994 raw material Substances 0.000 claims abstract description 43
- 239000000945 filler Substances 0.000 claims abstract description 32
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 26
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 26
- 238000003032 molecular docking Methods 0.000 claims description 19
- 230000006835 compression Effects 0.000 claims description 18
- 238000007906 compression Methods 0.000 claims description 18
- -1 polytetrafluoroethylene Polymers 0.000 claims description 13
- 238000007493 shaping process Methods 0.000 claims description 7
- 230000007704 transition Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 5
- 230000000295 complement effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000003825 pressing Methods 0.000 abstract description 8
- 238000003754 machining Methods 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 239000011799 hole material Substances 0.000 description 91
- 238000009740 moulding (composite fabrication) Methods 0.000 description 51
- 238000010586 diagram Methods 0.000 description 10
- 230000002093 peripheral effect Effects 0.000 description 8
- 239000003638 chemical reducing agent Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 150000001336 alkenes Chemical class 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007812 deficiency Effects 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
- 239000007789 gas Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000002803 maceration Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000007787 solid Substances 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
- 238000005303 weighing Methods 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)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a kind of polytetrafluoroethylproducts products near-net-shape method and molds.Raw material is to pass through big end in this method, opposite squeeze of small end pressure head and be formed in the forming hole section of die sleeve, pass through big end, the opposite extruding of small end pressure head, it will be filled in originally in the material extruding in filler hole section to forming hole section, it is compressed together and form blank product with raw material of the script in forming hole section, and in the process, coordinated using the step wall surface of the hole of forming hole section and the big end frustum of big end pressure head, the big end of product is made directly in pressing process, so as to avoid waste of material and energy loss caused by the machining on bar blank, thus near-net-shape method has reduction raw material loss in the present invention, the advantages of improving production efficiency and product quality.
Description
Technical field
The present invention relates to a kind of polytetrafluoroethylproducts products near-net-shape method and molds.
Background technology
Currently, both at home and abroad in rotary type polytetrafluoroethylene (PTFE) pressing manufacture view, generally use overturning pressure pressurization
The mould pressing method of power die forging, especially in the manufacture of polytetrafluoroethylene (PTFE) spout, what is used is particularly extensive.Existing polytetrafluoroethyl-ne
Alkene spout is mainly by three kinds, respectively：
As shown in Figure 1, the first polytetrafluoroethylene (PTFE) spout includes body left small and right large, the major diameter section 101 of body and small
102 transition of reducer being tapered by right-to-left between diameter section 103, the peripheral surface and internal face of reducer 102 are
Smooth curved surface；
As shown in Fig. 2, second of polytetrafluoroethylene (PTFE) spout includes body left small and right large, the major diameter section 201 of right section of body
For the flaring shape gradually expanded outwardly from left to right, the path section 202 that left section of body is the loudspeaker that right-to-left gradually opens to the left
The degree of lip-rounding passes through 203 transition of throat left small and right large, the inner wall of throat 203 between the major diameter section 201 and path section 202 of body
Face and peripheral surface are smooth curved surface；
As shown in figure 3, the third polytetrafluoroethylene (PTFE) spout includes right big left small body, the path section 302 that right section of body
Major diameter section 301 with left section is direct tube section, and be gradually expanded to the left by freedom between major diameter section 301 and path section 302
303 transition of reducer, the internal face and peripheral surface of reducer 303 are circular conical surface.
The production procedure of the polytetrafluoroethylene (PTFE) spout is：Batch mixing --- molding --- sintering --- machining --- cleaning
And packaging, wherein more it is important that molding, sintering and cutting process.The mold used in die forming is by die sleeve, core
Axis and two pieces of pressure head compositions, the wherein internal face of die sleeve is inner cylinder face, and guiding movement is assemblied in die sleeve to two pressure heads in an axial direction
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 forming of plane form
End face.Coining process is two-sided method for press forming, including nine processing steps, pressed ware is in weighing 6.3kg
The polytetrafluoroethylene (PTFE) of hollow-cylindrical is molded revolving body blank product, and specific mold process is as follows：Charging（Used time 20min）, pressure
It is at the uniform velocity boosted 400kN, pressurize 20min through 5min by 0kN, through 5min at the uniform velocity pressure releases to 0kN, 180 ° of turn-over（Used time about 20min）,
Pressure is at the uniform velocity boosted 400kN, pressurize 20min by 0kN through 5min, through 5min at the uniform velocity pressure releases to 0kN, demoulding（Used time 8min）And it is complete
At total used time 2h8min；It is sintered again and machining, the raw material that this forming process not only expends are larger, and make
Product shape and machining inefficiency.In addition, in the die forming stage, the side of extrusion molding is carried out from the both ends of blank product
Formula can cause the problem of institutional framework is destroyed in the middle part of blank product, in this way after sintering and machining, polytetrafluoroethylproducts products
The tapered sleeve section of finished product will appear the problem of intensity deficiency, reduce product quality.
Invention content
The object of the present invention is to provide a kind of polytetrafluoroethylproducts products near-net-shape methods of reduction raw material loss, simultaneously
The present invention also provides a kind of polytetrafluoroethylproducts products formings for being exclusively used in implementing the polytetrafluoroethylproducts products near-net-shape method
Mold.
In order to achieve the goal above, the technical solution of polytetrafluoroethylproducts products near-net-shape method is as follows in the present invention：
Polytetrafluoroethylproducts products near-net-shape method, includes the following steps：
Raw material is filled in die sleeve by step 1, and the endoporus of die sleeve has the forming hole section and filler hole section of coaxial communication,
Forming hole section is stepped hole, and filler hole section is straight hole, and raw material is equipped with full of filler hole section and forming hole section at the both ends of die sleeve
The small end pressure head of small bore end in forming hole section and the big end pressure head in the small bore end for shaping hole section, the compression of big end pressure head
End is convexly equipped with big end frustum with the inner wall coaxial spaced of die sleeve, and big end pressure head and/or small end pressure head be can be in die sleeve
The dynamic head of sliding is sealed in hole；
Step 2 presses dynamic head so that the compression end of big end pressure head and the compression end of small end pressure head are opposite in die sleeve
Move towards, until big end pressure head reaches the large port of forming hole section, small end pressure head reaches the portlet of forming hole section, and fills out
Raw material is pressed completely into forming hole section in material hole section, and raw material is squeezed into hair in shaping hole section by big end, small end pressure head
Base product.
In step 1, in big end pressure head and small end pressure head one be dynamic head, another be in forming hole section pair
Answer the level pressure head in port；In step 2, by the way that dynamic head is pressed to close to the direction of level pressure head so that big end, small end
Pressure head is opposite to be moved towards.
The technical solution of polytetrafluoroethylproducts products near net forming mould is as follows in the present invention：
It is exclusively used in implementing the mold of polytetrafluoroethylproducts products near-net-shape method, includes the die sleeve for containing raw material, mould
It is stepped hole that the endoporus of set, which has the forming hole section and filler hole section of coaxial communication, forming hole section, and filler hole section is straight hole；Also wrap
It includes for the small end pressure head of the small bore end compression raw material from forming hole section and for the tight raw material of macropore side pressure from forming hole section
Big end pressure head, big end pressure head and/or small end pressure head are that the dynamic head of sliding can be sealed in the endoporus of die sleeve, and big end, small end
Pressure head all has the compression end for compressing raw material, is convexly equipped in the compression end of big end pressure head and is inserted into die sleeve for coaxial spaced
Endoporus in big end frustum.
Filler hole section is in one end of forming hole section, and in big end pressure head and small end pressure head one for for self filler hole section
Sealing slide into forming hole section corresponding ports in dynamic head, another be for be maintained at forming hole section corresponding ports in
Level pressure head.
Filler hole section is in the big end of forming hole section, and the big end pressure head is the dynamic pressure that sliding can be sealed in filler hole section
Head, small end pressure head are level pressure head.
Filler hole section is in the small end of forming hole section, and the small end pressure head is the dynamic pressure that sliding can be sealed in filler hole section
Head, big end pressure head are level pressure head.
The small end frustum being inserted into for coaxial spaced in the endoporus of die sleeve is convexly equipped in the compression end of small end pressure head.
Further include the core bar for being coaxially installed in die sleeve, and coaxial arrangement is offered on big end, small end pressure head
It perforates for the core bar guiding that pilot seal installs in an axial direction.
Core bar is by more than two sections dividing the body of rod to dock successively from top to bottom.
Die sleeve includes more than two sleeves being coaxial docking, and the forming hole section is in each sleeve in one, stuffing hole
Section is composed of the endoporus of remaining sleeve.
Raw material is that the forming hole section in die sleeve by big end, squeezing in opposite directions for small end pressure head is formed in the present invention
, i.e., by big end, the opposite extruding of small end pressure head, by the material extruding being filled in originally in filler hole section to shaping hole section
In, it is compressed together and form blank product with raw material of the script in forming hole section, and in the process, utilize shaped hole
The big end frustum cooperation of the step wall surface of the hole and big end pressure head of section, is made the big end of product, to keep away directly in pressing process
Exempt to machine caused waste of material and energy loss on bar blank, thus near-net-shape method has in the present invention
The advantages of reducing raw material loss, improving production efficiency and product quality.
Description of the drawings
Fig. 1 is the structural schematic diagram of the first polytetrafluoroethylproducts products in the prior art；
Fig. 2 is the structural schematic diagram of second of polytetrafluoroethylproducts products in the prior art；
Fig. 3 is the structural schematic diagram of the third polytetrafluoroethylproducts products in the prior art；
Fig. 4 is the structural schematic diagram of the Die Embodiment 1 of the present invention；
Fig. 5 is the schematic diagram of product sample point in the embodiment of the corresponding near-net-shape method of mold in Fig. 4；
Fig. 6 is the density comparison diagram of product and traditional product at sample point in Fig. 5（Horizontal axis indicates sample point, longitudinal axis table
Show density）；
Fig. 7 is the tensile strength comparison diagram of product and traditional product at sample point in Fig. 5（Horizontal axis indicates sample point, indulges
Axis indicates tensile strength）；
Fig. 8 is the breakdown strength comparison diagram of product and traditional product at sample point in Fig. 5（Horizontal axis indicates sample point, indulges
Axis indicates breakdown strength）；
Fig. 9 is the structural schematic diagram of the Die Embodiment 2 of the present invention；
Figure 10 is the structural schematic diagram of the Die Embodiment 3 of the present invention.
Specific implementation mode
The embodiment 1 of polytetrafluoroethylproducts products near net forming mould in the present invention：The mold is primarily adapted for use in preparation first
Kind polytetrafluoroethylproducts products, as shown in figure 4, the mold is mainly made of die sleeve, small end pressure head 4, big end pressure head 1 and core bar.
Die sleeve is made of the upper bush 9, middle sleeve 7 and lower sleeve 3 being coaxial docking from top to bottom.Upper bush 9, middle sleeve 7
With the lower docking seam allowance of annular, upper end one are offered on the periphery of lower end in two neighboring butt end in lower sleeve 3 one
It offers on inner wall and coincide to slotting upper docking seam allowance with the lower seam allowance that docks, with inserting by upper docking seam allowance and lower docking seam allowance
Set cooperation realizes upper bush 9, middle sleeve 7 and lower sleeve 3 in axial removable docking.Upper bush 9, middle sleeve 7 and lower sleeve 3
Periphery on be welded with the handle 11 for being arranged symmetrically in its opposite sides.Lower sleeve 3 is the bottom in each sleeve
End body, the internal diameter of remaining sleeve is equal to the internal diameter of 3 big end of lower sleeve, and the endoporus of lower sleeve 3 is and blank product
Shape coincide complementary forming hole section, which is up big and down small stepped hole, the aperture section of stepped hole and big hole 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 in taper hole section with
On part be big hole section lower part.The forming hole section by set gradually from top to bottom big end pressure head accommodating section, shaped segment
It is formed with small end pressure head accommodating section, wherein big end pressure head accommodating section is for accommodating big end pressure head 1, and small end pressure head accommodating section is for holding
Receive small end pressure head 4, the wall surface of the hole of shaped segment be used for the peripheral surface of blank product 2 coincide cooperation.Middle sleeve 7 and lower sleeve 3
Endoporus combine to form filler hole section, which is aperture and the equal straight hole in the forming aperture of big hole section of hole section, is filled out
The effect of material hole section is the raw material accommodated when raw material is added other than forming hole section, is equal to and accommodates forming hole section to be pressed into
In raw material.
Core bar by guide head 10, on divide the body of rod 8, in divide the body of rod 6 and under divide the body of rod 5 to dock successively from top to bottom.It leads
To first 10, on divide the body of rod 8, in divide the body of rod 6 and under divide on opposite end two neighboring in the body of rod 5 and be coaxially arranged with respectively in upper
The shaft end plug at end and the shaft end jack in lower end, shaft end plug are threaded in the jack of shaft end, with realize each bar section it
Between it is removable be connected.On divide the body of rod 8 bar grow equal to upper bush 9 length, in divide the body of rod 6 bar grow equal to middle sleeve 7 length
Degree, under divide the body of rod 5 bar grow equal to lower sleeve 3 length.Core bar is coaxially installed on the center of die sleeve, and the effect of core bar is to small
The pressure head of side pressure head 4, big end pressure head 1 and forcing press provides positioning and is oriented to.
Small end pressure head 4 is mounted in the lower end aperture of the aperture section of lower sleeve 3, and the center of small end pressure head 4 is offered for core
Bar is oriented to the lower guiding perforation of insertion in an axial direction, and the peripheral surface of small end pressure head 4 and the wall surface of the hole of aperture section coincide and be affixed, to ensure
Small end pressure head 4 is oriented in an axial direction in the lower end aperture for the aperture section for being assemblied in lower sleeve 3.The lower ring end face of small end pressure head 4 and mould
The ring end face for covering lower end is concordant, and the pressure side surface of small end pressure head 4 is the plane of the ring end face for 2 lower end of forming workblank product,
I.e. the upper end of the small end pressure head 4 is the plane pressed end for being arranged towards big end pressure head 1 after being packed into die sleeve.
Big end pressure head 1 is mounted in the big hole section of die sleeve, and the center of big end pressure head 1 is offered is oriented to shifting for core bar in an axial direction
The dynamic upper guiding perforation installed.Big end pressure head 1 is divided into the guide holder set gradually from top to bottom, caudal peduncle section and big end with its shape
Frustum, the wherein peripheral surface of guide holder and the wall surface of the hole of big hole section coincide and are affixed, to ensure that guiding movement fills guide holder in an axial direction
It fits in big hole section；For the coaxial projection of caudal peduncle section in the lower end of guide holder, caudal peduncle section is the cylinder thinner than guide holder, and caudal peduncle section is used
In the upper end for being inserted into raw material, and columned upper port is formed in the upper end of blank product 2；Big end frustum is in big end pressure head
1 compression end, and big end frustum is the cone that outer diameter is gradually reduced from top to bottom, the peripheral surface of big end frustum is outwardly convex
Cambered surface, the wall surface of the hole cooperation of the peripheral surface of the big end frustum and taper hole section, to ensure that the reducer of blank product 2 is and product
Consistent.
The operation principle of mold polytetrafluoroethylproducts products near-net-shape method as described below in the present embodiment.
The embodiment 1 of the polytetrafluoroethylproducts products near-net-shape method of the present invention：This method is poly- in order to prepare the first
The blank product of tetrafluoroethene product, the mold used for Die Embodiment 1 in mold, this approach includes the following steps：
1, raw material is fitted into mold, polytetrafluoroethylproducts products near-net-shape mould in the structure such as above-described embodiment of mold
Tool, after raw material loading, small end pressure head is positioned on the workbench of forcing press, so that small end pressure head and die sleeve keep relatively solid
It is fixed, and the big end pressure head of mold is fixed on the head of forcing press；
2, start forcing press, in the case where small end pressure head and die sleeve remain stationary as on the table, head drives big
Side pressure head pulls down raw material, until the raw material between big end pressure head and small end pressure head is pressed into blank product, this blank system
Part has major diameter section, reducer and the path section set gradually from top to bottom, and the outer diameter of major diameter section is bigger than the outer diameter of path section, and
The outer diameter of reducer is gradually reduced from major diameter section to path section；
3, after blank product is removed from the molds, blank product is sintered successively and machining, until by hair
Base product is processed into product.
By taking the raw material of 4.4kg as an example, the technique duration of above-mentioned processing step is：It feeds in step 1, used time 10mi；
In step 2, pressure is at the uniform velocity boosted 350kN, pressurize 20min by 0kN through 5min；In step 3, extremely through 5min at the uniform velocity pressure releases
0MPa, demoulding（Used time 5min）And it completes, total used time 45min.Processing step charging is more convenient, and saves turn-over and another
The time of face pressure, and be convenient in demoulding, therefore greatly improve compacting production efficiency.
The key performance of product made from product and traditional handicraft in the present embodiment obtained by method detects and comparison, such as
Shown in Fig. 5 to Fig. 8, wherein A indicates that product made from traditional handicraft, B indicate the product obtained by method in the present embodiment.Survey makes
The density uniformity of the polytetrafluoroethylproducts products each section obtained with two kinds of distinct methods and mold, the stretching for solving body tissue are strong
The electrical strength of degree, solution body tissue, and carry out the industrial frequency withstand voltage experiment of polytetrafluoroethylproducts products.
1. density uniformity：5 samples are respectively chosen from the position of polytetrafluoroethylene (PTFE) pressing upper, middle and lower three respectively, respectively
1 experiment is carried out, is tested by the method for 5.1 descriptions in GB/T 1033.1-2008, maceration extract is water, test temperature 23
± 2 DEG C, the density of sample is calculated according to GB/T 1033.1-2008 Chinese styles 2, is averaged；
2. tensile strength：It is tested according to the 5.1st article in GB/T 2567-2008,23 ± 2 DEG C of test temperature, stretches speed
Rate 5mm/min tests 5 samples, is averaged；
3. electrical strength；It is tested according to the method for 10.1 descriptions in GB/T 1408-2006, specimen finish 100mm,
Thickness 1mm, 23 ± 2 DEG C of test temperature carry out in 0.4MPa SF6 gases, and rate of pressure rise 500V/s uses two symmetric flat panels
Electrode is tested 5 samples, is averaged.
4. industrial frequency withstand voltage is tested：750kV/1min pressure tests are carried out to polytetrafluoroethylene (PTFE) pressing, it is desirable that in the process
Without flashover and punch-through.
Experimental result：
Density uniformity compares：See Fig. 6；
Tensile strength compares：See Fig. 7；
Breakdown strength compares；See Fig. 8.
It can be seen that using near-net-shape drawing method and mold and the polytetrafluoroethylene (PTFE) using traditional pressing methods acquisition
Pressing density uniformity, electric property, mechanical performance are substantially suitable, but stock utilization, production efficiency greatly improve,
Every year can be 683.4 ten thousand yuan cost-saved, at the same die forming process improving productivity 183.99%, the life of machining process
Produce improved efficiency 75%.The type near-net-shape method can also be promoted and applied to other nonmetallic parts manufacturing fields（Such as thermoplastic
Property engineering plastics etc.）, generate the economic benefit of bigger.
In the present invention in the present invention polytetrafluoroethylproducts products near net forming mould embodiment 2：The present embodiment and embodiment 1
Difference lies in as shown in figure 9, the mold is primarily adapted for use in the blank product for preparing second of polytetrafluoroethylproducts products, small end
The compression end of pressure head is convexly equipped with the coaxial small end frustum 24 being inserted into the endoporus of lower sleeve 23, and the effect of the small end frustum 24 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 and the difference of embodiment 1 exist
In this method is primarily adapted for use in the blank product for preparing second of polytetrafluoroethylproducts products, and the mold used is Die Embodiment 2
The use step of middle mold, mold is same as Example 1, and details are not described herein.
In the present invention in the present invention polytetrafluoroethylproducts products near net forming mould embodiment 3：The present embodiment and embodiment 1
Difference lies in, as shown in Figure 10, which is primarily adapted for use in the blank product 32 for preparing the third polytetrafluoroethylproducts products, under
Sleeve 33 is inverted so that the small end of the forming hole section in lower sleeve 33 upper, big end under, corresponding big end pressure head 31 in
The level pressure head of die sleeve bottom, small end pressure head 34 are the dynamic head above big end pressure head 31；Meanwhile middle sleeve 37 and upper bush
39 barrel dliameter reduces so that the internal diameter of middle sleeve 37 and upper bush 39 is equal to the small end aperture of forming hole section.
The embodiment 3 of the polytetrafluoroethylproducts products near-net-shape method of the present invention：The present embodiment and the difference of embodiment 1 exist
In this method is primarily adapted for use in the blank product for preparing the third polytetrafluoroethylproducts products, and the mold used is Die Embodiment 3
Middle mold, the use step of mold are also utilized in the case that level pressure head remains stationary as, and press dynamic head from top to bottom, herein
It repeats no more.
The other embodiment of polytetrafluoroethylproducts products near net forming mould in the present invention：The die sleeve, which can also use, divides valve to spell
Conjunction or monolithic construction etc..In addition, taper hole section both may be at bottommost in the die sleeve, intermediate and top can also be belonged to,
It can realize that raw material shapes at taper hole section by changing the forms of motion of die sleeve and two pressure heads in this way.
The other embodiment of polytetrafluoroethylproducts products near-net-shape method in the present invention：From the technique of top die forming
It can more become being carried out at the same time from bottom surface or from two sides, or even after overturning by the way of the die forming of two sides.
By above-mentioned other embodiment it is found that polytetrafluoroethylproducts products near-net-shape method can be in accordance with the following steps in the present invention
Implement：
Raw material is filled in die sleeve by step 1, and the endoporus of die sleeve has the forming hole section and filler hole section of coaxial communication,
Forming hole section is stepped hole, and filler hole section is straight hole, and raw material is equipped with full of filler hole section and forming hole section at the both ends of die sleeve
The small end pressure head of small bore end in forming hole section and the big end pressure head in the small bore end for shaping hole section, the compression of big end pressure head
End is convexly equipped with big end frustum with the inner wall coaxial spaced of die sleeve, and big end pressure head and/or small end pressure head be can be in die sleeve
The dynamic head of sliding is sealed in hole；
Step 2 presses dynamic head so that the compression end of big end pressure head and the compression end of small end pressure head are opposite in die sleeve
Move towards, until big end pressure head reaches the large port of forming hole section, small end pressure head reaches the portlet of forming hole section, and fills out
Raw material is pressed completely into forming hole section in material hole section, and raw material is squeezed into hair in shaping hole section by big end, small end pressure head
Base product.
Claims (9)
1. polytetrafluoroethylene (PTFE) spout near-net-shape method, which is characterized in that include the following steps：
Raw material is filled in die sleeve by step 1, and the endoporus of die sleeve has the forming hole section and filler hole section of coaxial communication, described
Die sleeve is made of the upper bush, middle sleeve and lower sleeve being coaxial docking from top to bottom, adjacent in upper bush, middle sleeve and lower sleeve
Offered on the periphery of lower end one in two butt ends annular lower docking seam allowance, upper end one inner wall on offer under
Seam allowance is docked to coincide to slotting upper docking seam allowance, by the sleeve cooperation of upper docking seam allowance and lower docking seam allowance realize upper bush,
Middle sleeve and lower sleeve are in axial removable docking；The endoporus of lower sleeve be with the shape of blank product coincide it is complementary it is described at
Shape hole section, forming hole section is the stepped hole for including big hole section and lower hole section, by taper hole section transition between aperture section and big hole section,
The wall surface of the hole of taper hole section is inwardly protruded curved wall；The endoporus of middle sleeve and lower sleeve combines to form the filler hole section,
Filler hole section is straight hole, and the filler hole section is accommodated when raw material is added other than forming hole section, forming hole section to be pressed into
In raw material；Raw material is equipped with the small bore end in forming hole section full of filler hole section and forming hole section, and at the both ends of die sleeve
The big end pressure head of small end pressure head and small bore end in forming hole section, the compression end of big end pressure head is convexly equipped with same with the inner wall of die sleeve
Between centers every big end frustum, and big end pressure head and/or small end pressure head are the dynamic head that sliding can be sealed in the endoporus of die sleeve；
Step 2 presses dynamic head so that the compression end of big end pressure head and the compression end of small end pressure head phase opposite in die sleeve
To movement, until big end pressure head reaches the large port of forming hole section, small end pressure head reaches the portlet of forming hole section, and stuffing hole
Raw material is pressed completely into forming hole section in section, and raw material is squeezed into blank system in shaping hole section by big end, small end pressure head
Part.
2. polytetrafluoroethylene (PTFE) spout near-net-shape method according to claim 1, which is characterized in that in step 1, greatly
In side pressure head and small end pressure head one be dynamic head, another be in forming hole section corresponding ports in level pressure head；In step
In rapid two, by the way that dynamic head is pressed to close to the direction of level pressure head so that big end, small end pressure head are opposite to be moved towards.
3. being exclusively used in implementing the mold of polytetrafluoroethylene (PTFE) spout near-net-shape method as described in claim 1, including it is used for
The die sleeve of raw material is contained, the endoporus of die sleeve has the forming hole section and filler hole section of coaxial communication, and the die sleeve is by from top to bottom
The upper bush that is coaxial docking, middle sleeve and lower sleeve are constituted, in upper bush, middle sleeve and lower sleeve in two neighboring butt end under
The lower docking seam allowance of annular is offered on one periphery in end, is offered on the inner wall of upper end one and dock identical pair of seam allowance under
Slotting upper docking seam allowance realizes upper bush, middle sleeve and lower sleeve by the sleeve cooperation of upper docking seam allowance and lower docking seam allowance
In axial removable docking；The endoporus of lower sleeve is and the shape of blank product the is coincide complementary forming hole section, shaped hole
Section is the stepped hole for including big hole section and lower hole section, passes through taper hole section transition, the hole wall of taper hole section between aperture section and big hole section
Face is inwardly protruded curved wall；The endoporus of middle sleeve and lower sleeve combines to form the filler hole section, and filler hole section is straight
Hole, the filler hole section accommodate other than forming hole section when raw material is added, wait the raw material being pressed into forming hole section；The mould
Tool further includes that the small end pressure head for compressing raw material from the small bore end for shaping hole section and the macropore side pressure for from forming hole section are tight
The big end pressure head of raw material, big end pressure head and/or small end pressure head are that the dynamic head of sliding can be sealed in the endoporus of die sleeve, and big
End, small end pressure head all have the compression end for compressing raw material, are convexly equipped in the compression end of big end pressure head and are inserted for coaxial spaced
Big end frustum in the endoporus of die sleeve.
4. mold according to claim 3, which is characterized in that filler hole section is in one end of forming hole section, and big side pressure
In head and small end pressure head one to slide into the dynamic head, another in the corresponding ports of forming hole section for the sealing of self filler hole section
A level pressure head for for being maintained in the corresponding ports of forming hole section.
5. mold according to claim 4, which is characterized in that filler hole section is in the big end of forming hole section, the big end
Pressure head is the dynamic head that sliding can be sealed in filler hole section, and small end pressure head is level pressure head.
6. mold according to claim 4, which is characterized in that filler hole section is in the small end of forming hole section, the small end
Pressure head is the dynamic head that sliding can be sealed in filler hole section, and big end pressure head is level pressure head.
7. mold according to claim 6, which is characterized in that be convexly equipped with for coaxial spaced in the compression end of small end pressure head
The small end frustum being inserted into the endoporus of die sleeve.
8. the mold according to any one of claim 3 to 6, which is characterized in that further include for being coaxially installed on mould
Core bar in set, and offer on big end, small end pressure head coaxial arrangement for the core bar guiding that pilot seal installs in an axial direction
Perforation.
9. mold according to claim 8, which is characterized in that core bar is by more than two sections dividing the body of rod right successively from top to bottom
It connects.
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 |
Publications (2)
| Publication Number | Publication Date |
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| CN106217730A CN106217730A (en) | 2016-12-14 |
| CN106217730B true CN106217730B (en) | 2018-09-04 |
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| IT201800010919A1 (en) | 2018-12-10 | 2020-06-10 | Sacmi | Apparatus and method for forming a concave object. |
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| FI800637A (en) * | 1980-02-29 | 1981-08-30 | Huhtamaeki Oy | FOERFARANDE FOER TILLVERKNING AV ETT PLASTKAERL |
| CN201677520U (en) * | 2009-12-11 | 2010-12-22 | 上海复合材料科技有限公司 | Forming mould for compacting composite material with internal thread |
| CN203579982U (en) * | 2013-09-23 | 2014-05-07 | 富顺县众城氟塑料厂 | T-shaped polytetrafluoroethylene tube forming mold |
| CN105135060B (en) * | 2015-08-19 | 2017-12-19 | 天津市天塑滨海氟塑料制品有限公司 | A kind of mould of polytetrafluoroethylene (PTFE) communication cable support and its production and application |
| CN205853235U (en) * | 2016-08-09 | 2017-01-04 | 山东泰开电器绝缘有限公司 | A kind of politef spout material-saving blank compacting tool set |
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