CN106079498B - The method for making the mold of hollow ball and making hollow ball - Google Patents
The method for making the mold of hollow ball and making hollow ball Download PDFInfo
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- CN106079498B CN106079498B CN201610625290.8A CN201610625290A CN106079498B CN 106079498 B CN106079498 B CN 106079498B CN 201610625290 A CN201610625290 A CN 201610625290A CN 106079498 B CN106079498 B CN 106079498B
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- Prior art keywords
- hollow ball
- mold
- liner
- external mold
- shell
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D22/00—Producing hollow articles
- B29D22/04—Spherical articles, e.g. balls
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/12—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2022/00—Hollow articles
- B29L2022/002—Globes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pens And Brushes (AREA)
Abstract
The invention belongs to machine component fields, and in particular to a method of it making the mold of hollow ball and makes hollow ball.Including liner and the shell being coated on outside liner, liner is set as hollow ball-shape structure, and shell is integrally formed.A kind of mold making above-mentioned hollow ball is also disclosed, including:External mold, upper die and lower die, auxiliary mould and detent mechanism；External mold is set as tubular structure, and outer mold cavity is set as die cavity, and upper die and lower die are separably respectively arranged at the upper and lower part of die cavity；Die sleeve is assisted to be set to external mold outer to position external mold；Detent mechanism is arranged along the circumferential direction of external mold and pushes against liner.Since bond line is not present in hollow ball provided by the invention, thus in highly corrosive environments, the problem of hollow ball degumming is cracked caused by there is no bond line is corroded due to corrosive liquids, likewise, will not have the problem of Cracking that is pressurized caused by hollow ball bonding part adhesion strength is inadequate.
Description
Technical field
The invention belongs to machine component fields, more particularly, to a kind of mold making hollow ball and make hollow ball
Method.
Background technology
Polytetrafluoroethylene (PTFE) has excellent chemical stability, corrosion resistance, is that corrosion resistance is best in the world today
One of material is resistant to all other chemicals, extensive use in addition to molten alkali metal, chlorine trifluoride, chlorine pentafluoride and liquid fluorine
In the various occasions for needing antiacid alkali and organic solvent.There is sealing property, high lubrication, non-stickiness, electrical insulation and good anti-aging
Ability, heat resistance are excellent.
The hollow ball made of polytetrafluoroethylene (PTFE) has obtained widely answering due to the excellent performance of polytetrafluoroethylene (PTFE) itself
With polytetrafluoroethylene (PTFE) hollow ball is widely used in bearing, roller, valve, check-valves and some cryogenic liquids and acid condition
Under instrument, the work of sealing and protection is especially played in the equipment such as the stronger pipeline of some corrosivity, anti-corrosion pond, pump valve
With.
Existing polytetrafluoroethylene (PTFE) hollow ball is generally to be bonded by two hemisphere, and the material of two hemisphere is poly-
The mode of tetrafluoroethene, the bonding of two hemisphere is, for example, threaded connection or glue bonding.But in pipeline, pump valve and prevent
In rotten pond there are larger pressure and corrosivity it is stronger, under extraneous larger pressure effect, bond line is easy cracking, is corroding
Under the stronger environment of property, it is easy to be corroded at bond line.The polytetrafluoroethylene (PTFE) hollow ball connected using screw thread or glue can be because
Extraneous severe working environment and either degumming of cracking causes sealing or protective value to be lost, or even caused to personal safety
Certain harm.
Main problem is existing for polytetrafluoroethylene (PTFE) hollow ball in the prior art：It is easy to cause because of cracking or degumming
Product failure.
Invention content
The purpose of the present invention is to provide a kind of mold making hollow ball and the methods for making hollow ball, existing to solve
There is the problem of hollow ball in technology is easy to lead to product failure because of cracking or degumming.
The invention discloses a kind of hollow balls, including liner and the shell being coated on outside the liner, the liner setting
For hollow ball-shape structure, the shell is integrally formed.
Further, the material of the shell is polytetrafluoroethylene (PTFE).
Further, the material of the liner is stainless steel.
The invention discloses a kind of molds making above-mentioned hollow ball, including:External mold, upper die and lower die, auxiliary mould and positioning
Mechanism；
The external mold is set as tubular structure, and the outer mold cavity is set as die cavity, and the upper mold and the lower die can divide
The liftoff upper and lower part for being respectively arranged at the die cavity；It is outer to position the external mold that the auxiliary die sleeve is set to the external mold；
The detent mechanism is arranged along the circumferential direction of the external mold and pushes against the liner, and the detent mechanism is for positioning in described
Courage.
Further, the detent mechanism includes the female positioning tooth for being set to the auxiliary mould upper surface, is set to institute
It states the location hole on external mold and separably fits through the location hole with female positioning tooth to push against the liner
Auxiliary tool.
Further, the auxiliary tool includes with the sub- positioning tooth of female positioning tooth engagement and along the mother
The gland of positioning tooth and sub- positioning tooth orientation setting, the gland pass through the location hole to push against the liner.
Further, there are three the detent mechanism settings, three detent mechanisms are in the circumferential direction side of the external mold
It is uniformly distributed upwards.
The invention discloses a kind of methods of the Mold Making hollow ball of above-mentioned making hollow ball, include the following steps：
Step S1, blank production process：
Step S11, feeds for the first time：The lower die is put into the die cavity of the external mold, and it is former that shell is added into the die cavity
Material, the liner is put into die cavity, and being centrally located in the liner in the die cavity using the detent mechanism
On axis；
Step S12, rotates for the first time：The external mold is rotated around the central axes of the external mold, so that the shell material is enclosed
It is uniformly distributed around the liner；
Step S13, secondary charging：The shell material of other half is added into the die cavity；
Step S14, secondary rotating：The detent mechanism is removed, is rotated again around the central axes of the external mold described outer
Mould, so that the shell material is uniformly distributed around the liner；
Step S15：Press pressurize：By the upper mould cover together in the top of the lower die, and to the external mold, the upper mold
It presses simultaneously with the lower die and pressurize, demoulding after the completion of pressurize obtains green article；
Step S2, sintering circuit：The green article is put into sintering furnace, sintering temperature gradually rises supreme from room temperature
Temperature threshold is limited, then stops heating until the temperature in sintering furnace is gradually decrease to lower temperature threshold, taking-up green article
Natural cooling is carried out, semi-finished product are obtained；
Step S3, post-processing process：The semi-finished product are polished and grinding process, finished product is obtained.
Further, it in the step S1, rotates for the first time opposite with the direction of rotation rotated again.
Further, in the step S2, high limit temperature threshold is set as 360 DEG C -400 DEG C, and lower temperature threshold is set
It is set to 60 DEG C -100 DEG C.
In conjunction with above technical scheme,
The invention discloses a kind of hollow ball, including liner and the shell that is coated on outside liner, liner are set as hollow knot
Structure, shell are integrally formed.Hollow ball provided by the invention is glued in the prior art only by two polytetrafluoroethylene (PTFE) hemisphere
Hollow ball made of knot is compared, and due to being provided with liner, liner can effectively improve the intensity of hollow ball so that hollow ball can be with
Bear stronger ambient pressure.Again since hollow ball provided by the invention is integrally formed, bond line is not present, thus in high corrosion
Property environment in, there is no due to corrosive liquids corrode bond line caused by hollow ball degumming crack the problem of, likewise,
There will not be the problem of Cracking that is pressurized caused by hollow ball bonding part adhesion strength is inadequate.
The invention also discloses a kind of molds making hollow ball, including:External mold, upper die and lower die, auxiliary mould and localization machine
Structure；External mold is set as tubular structure, and outer mold cavity is set as die cavity, upper die and lower die be separably set to die cavity top and
Lower part；Die sleeve is assisted to be set to external mold outer to position external mold；The circumferential direction of external mold described in detent mechanism is arranged and pushes against in described
Courage, for liner to be fixed.Upper die and lower die enclose set made of diameter of Spherical Volume as the molding space of hollow ball, assist die sleeve
External mold can be steadily fixed outside external mold, avoided since hollow ball final molding is ineffective caused by the displacement of external mold
The problem of even failing.Since hollow ball provided by the invention is provided with liner, liner is hollow ball-shape structure, and liner center is inclined
Hollow ball molding effect can be caused bad from hollow ball center or even scrapped, in order to ensure the center of liner and the center of hollow ball
It overlaps, in the manufacturing process of hollow ball, it is necessary to assure the accurate positionin of liner, a kind of hollow ball that makes provided by the invention
Mold is provided with positioning tool, and positioning tool is arranged along the circumferential direction of external mold and pushes against liner, positions the balanced action of tool
Power makes liner center be overlapped with the center of hollow ball, ensures a kind of molding effect of mold making hollow ball provided by the invention
Fruit, using the mold provided by the invention for making hollow ball, it is possible to prevente effectively from hollow ball in the prior art is easy because of cracking
Or caused by degumming the problem of product failure.
The invention also discloses a kind of methods making hollow ball.Specifically include blank production process, sintering circuit and after
Manufacturing procedure.Wherein, blank production process is for manufacturing blank, and for obtaining semi-finished product, post-processing process is used for sintering circuit
Obtain finished product.More specifically, include following procedures in blank production process：For the first time charging, for the first time rotation, it is secondary plus
Material, secondary rotating and pressure pressurize.Charging for the first time is that shell material is added in die cavity, and liner is then put into die cavity, and profit
Ensure that the center of liner is located on the central axes of die cavity with detent mechanism.Rotation for the first time is outer around the rotation of the central axes of external mold
Mould, so that shell material is uniformly distributed around liner.Secondary charging is the shell material that other half is added into die cavity.It is secondary
Rotation is to rotate external mold again so that shell material is uniformly distributed around liner after removing detent mechanism.Pressure pressurize be by
After upper mould cover is together in lower die top, to pressure and the pressurize simultaneously of external mold, upper die and lower die, and finally demoulding obtains green article.
Sintering circuit is that green article is put into sintering furnace, and sintering temperature gradually rises from room temperature to high limit temperature threshold, then stops
Only until the temperature in sintering furnace is gradually decrease to lower temperature threshold, taking-up green article carries out natural cooling, obtains for heating
Semi-finished product.Post-processing process is to be polished semi-finished product and grinding process, obtains finished product.Rotating through for the first time in the above method
Journey, due to being provided with detent mechanism, detent mechanism is arranged along the circumferential direction of external mold and pushes against liner, and detent mechanism is in external mold week
To the counteracting forces in direction the center of liner is located on the axis of external mold, thus can ensure logical to avoid liner bias
Cross the final product quality for the hollow ball that this method is prepared.In the above method, feeds and rotate for the first time so that shell is former for the first time
Material is uniformly distributed in liner peripheral surface, forms the hemisphere of lower half portion, secondary charging and secondary rotating so that shell material is equal
It is even to be distributed in liner peripheral surface, form the hemisphere of top half.Finally through pressure and pressurize after, the hemisphere of lower half portion and upper
The hemisphere powder of half part can be merged fully, form overall structure, and green article is made.Green article by sintering circuit and
Finished product after the processing of post-processing process.Integrally formed sky can be prepared in the method provided by the invention for making hollow ball
Bulbus cordis, the hollow ball being prepared be not present bond line, it is possible to prevente effectively from hollow ball in the prior art be easy because cracking or
Caused by degumming the problem of product failure.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, other drawings may also be obtained based on these drawings.
Fig. 1 is the structural schematic diagram for the hollow ball that embodiment 1 provides；
Fig. 2 is the structural schematic diagram of the non-mounting auxiliary of mold for the making hollow ball that embodiment 2 provides；
Fig. 3 is that the mold for the making hollow ball that embodiment 2 provides is equipped with the structural schematic diagram of auxiliary tool；
Fig. 4 is the structural schematic diagram of auxiliary tool.
Reference numeral：
1- liners；2- shells；3- external molds；
4- upper molds；5- lower dies；6- assists mould；
Mother's 71- positioning tooth；72- location holes；73- auxiliary tools；
The sub- positioning tooths of 731-；732- glands.
Specific implementation mode
Technical scheme of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
The every other embodiment that personnel are obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term "center", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for the description present invention and simplify description, do not indicate or imply the indicated device or element must have a particular orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for description purposes only, and is not understood to indicate or imply relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
In order to further appreciate that present disclosure, feature and effect, following embodiment is hereby enumerated, and coordinate attached drawing detailed
Carefully it is described as follows：
Embodiment 1
The purpose of the present embodiment is that providing a kind of hollow ball, which is not present bond line, thus can effectively keep away
Exempt from hollow ball in the prior art and be easy degumming and cracking caused by there is bond line, specifically；
Refer to Fig. 1, including liner 1 and the shell 2 that is coated on outside liner 1, wherein liner 1 is set as hollow ball-shape knot
Structure, wherein shell 2 is integrally formed.
It should be noted that a kind of hollow ball provided in this embodiment is widely used in the following stronger pipe of such as corrosivity
Sealing and protective effect are played in the equipment such as road, anti-corrosion pond, pump valve.Due to being provided with liner 1, liner 1 can effectively improve sky
The intensity of bulbus cordis so that hollow ball can bear stronger ambient pressure.Again since hollow ball provided by the invention is integrally formed,
There is no bond lines, thus in highly corrosive environments, there is no empty caused by corrosive liquids corrosion bond line
The problem of bulbus cordis degumming is cracked is pressurized likewise, will not exist caused by hollow ball bonding part adhesion strength is inadequate
Problem of Cracking.
As one of which preferably embodiment, the material of shell 2 is polytetrafluoroethylene (PTFE).Polytetrafluoroethylene (PTFE) has excellent
It is chemical stability, corrosion-resistant.
As one of which preferably embodiment, the material of liner 1 is stainless steel.The material of stainless steel can effectively improve
The intensity of hollow ball, so that hollow ball can bear stronger ambient pressure.
Embodiment 2
The purpose of the present embodiment is that a kind of mold making hollow ball is provided, specifically,
Please also refer to Fig. 2, Fig. 3 and Fig. 4, including:External mold 3, upper mold 4, lower die 5, auxiliary mould 6 and detent mechanism.
Wherein, external mold 3 is set as tubular structure, and 3 inner cavity of external mold is set as die cavity, and upper mold 4 and lower die 5 are separably arranged
In the upper and lower part of die cavity；It is outer to position external mold 3 that auxiliary mould 6 is sheathed on external mold 3；Circumferential direction of the detent mechanism along external mold 3
It is arranged and pushes against simultaneously positioning liner 1.
Upper mold 4 and lower die 5 enclose diameter of Spherical Volume made of setting as the molding space of hollow ball, and auxiliary mould 6 is sheathed on outside external mold 3
Portion can steadily fix external mold 3, avoid since hollow ball final molding caused by the displacement of external mold 3 is ineffective or even failure
The problem of.
It should be noted that：Judge that one of the quality of hollow ball quality important criteria is liner 1 and shell 2
With one heart whether, if 2 decentraction of liner 1 and shell, i.e., liner 1 is relative to 2 eccentric setting of shell.Then, on the one hand, empty preparing
In the pressure pressure maintaining period of bulbus cordis, the stress of shell 2 will cause the molding of finished product bad because uneven；On the other hand,
During the use of hollow ball, the bias of liner 1 can lead to the centrifugal movement of hollow ball, seriously affect using the hollow ball
The control accuracy of equipment.In conjunction with the above analysis, in the preparation process of hollow ball, it need to ensure that the center of liner 1 and shell 2 overlaps
To ensure the yield rate of product.
In order to ensure that the center of liner 1 is overlapped with the center of shell 2, in the manufacturing process of hollow ball, it is necessary to assure interior
The accurate positionin of courage 1, thus, a kind of mold making hollow ball provided by the invention is provided with positioning tool, positioning tool edge
The circumferential direction of external mold 3 is arranged and pushes against liner 1, and the counteracting forces for positioning tool make in 1 center of liner and hollow ball
The heart overlaps, and thereby may be ensured that a kind of molding effect of mold making hollow ball provided by the invention.
In the alternative of the embodiment, as one of which preferably embodiment, detent mechanism is auxiliary including being set to
Female positioning tooth 71 of 6 upper surface of mould is helped, the location hole 72 of 3 outer wall of external mold is set to and separably matches with female positioning tooth 71
Location hole 72 is combined through to push against the auxiliary tool 73 of liner 1.
In above-mentioned alternative, as one of which preferably embodiment, auxiliary tool 73 includes and female positioning tooth 71
The sub- positioning tooth 731 of engagement and the gland 732 being arranged along female positioning tooth 71 and 731 orientation of sub- positioning tooth, gland
732 pass through location hole 72 to push against liner 1.Gland 732 is mutual with the peripheral surface of liner 1 close to the end set of liner 1
Matched structure, the globoidal structure that gland 732 is preferably arranged to outwardly protrude along radial direction from the centre of sphere of liner 1 is with complete
Abut liner 1.It is appreciated that the shape of female positioning tooth 71 and sub- positioning tooth 731 can be arranged as required to a variety of, such as can be
Rectangle, trapezoidal etc..
The course of work of auxiliary tool 73 is summarized as follows：
When needing to position liner 1, auxiliary tool 73 is positioned over 6 top of auxiliary mould, the fixation that auxiliary mould 6 has
First 732 towards die cavity, is set to the sub- positioning tooth 731 of 73 lower section of auxiliary tool and is set to female the positioning of the auxiliary tool of mould 6 top
Tooth 71 coordinates, specifically, female positioning tooth 71 is installed in the position between sub- positioning tooth 731.Gland 732 is disposed through outer
Location hole 72 on mould 3 simultaneously pushes against liner 1, be uniformly distributed in multiple auxiliary tools 73 of 2 circumferential direction of shell while pushing against in
Courage 1, liner 1 are fixed on the center of die cavity in the case of stress balance.
In above-mentioned alternative, preferably, there are three detent mechanism settings, circumferential direction of three detent mechanisms in external mold 3
It is uniformly distributed on direction, the active force that three detent mechanisms are applied on liner 1 is relatively stable.Certainly, the quantity of detent mechanism
It can also be arranged as required to as other quantity.
Using the mold provided by the invention for making hollow ball, integrally formed hollow ball, above-mentioned hollow ball can be prepared
There is no bond lines, thus in highly corrosive environments, there is no empty caused by corrosive liquids corrosion bond line
The problem of bulbus cordis degumming is cracked is pressurized likewise, will not exist caused by hollow ball bonding part adhesion strength is inadequate
Problem of Cracking.It is possible to prevente effectively from the easy product failure caused by cracking or degumming of hollow ball in the prior art is asked
Topic.
Embodiment 3
The purpose of the present embodiment is that providing a kind of method making hollow ball, the making disclosed in embodiment 2 is used
The mold of hollow ball makes the relevant technologies feature of the mold of hollow ball herein not to save length disclosed in embodiment 2
Description is repeated, is included the following steps：
Specifically,
Step S1, blank production process：
Step S11, feeds for the first time：Lower die 5 is put into the die cavity of external mold 3,2 raw material of shell is added into die cavity, by liner 1
It is put into die cavity, and being centrally located in liner 1 on the central axes of die cavity using detent mechanism；
Step S12, rotates for the first time：External mold 3 is rotated around the central axes of external mold 3, so that 2 raw material of shell is equal around liner 1
Even distribution；
Step S13, secondary charging：2 raw material of shell of other half is added into die cavity；
Step S14, secondary rotating：Detent mechanism is removed, external mold 3 is rotated again around the central axes of external mold 3, so that shell
2 raw materials are uniformly distributed around liner 1；
Step S15：Press pressurize：Upper mold 4 is covered on to the top of lower die 5, and simultaneously to external mold 3, upper mold 4 and lower die 5
It presses and pressurize, demoulding after the completion of pressurize obtains green article；
Step S2, sintering circuit：Green article is put into sintering furnace, sintering temperature gradually rises from room temperature to upper limit temperature
Threshold value is spent, then stops heating until the temperature in sintering furnace is gradually decrease to lower temperature threshold, taking-up green article carries out
Natural cooling obtains semi-finished product；
Step S3, post-processing process：Semi-finished product are polished and grinding process, finished product is obtained.
It should be noted that：2 powder of shell it is uniform whether be related to the yield of finished product, making provided in this embodiment
The method of hollow ball have passed through rotation and secondary rotating for the first time, and during rotating external mold 3,2 raw material of shell, which has, is intended to edge
The trend of direction of rotation accumulation, i.e. 2 raw material of shell there are problems that causing to be unevenly distributed because of local accumulation.
In order to ensure that 2 raw material of shell is uniformly distributed in die cavity around liner 1, in above-mentioned steps S1, for the first time rotation and again
The direction of rotation of secondary rotation is opposite.The direction rotated twice can ensure that 2 feed distribution of shell is more uniform on the contrary.
It should be noted that：Hollow ball is in sintering process, powder interface the gradually rising with temperature of 2 raw material of shell
And gradually merge, the gap between powder and powder tapers into until powder interface combines together completely.In sintering process
In, 2 internal residual of shell has thermal stress, which has the tendency that scattering and disappearing outward, but due to the gap between powder and powder
Reduce and thermal stress is caused to lose outwardly extending channel, Gu thermal stress has pressure separation shell 2 that and shell 2 is caused to split
Trend, when thermal stress reaches certain intensity, thermal stress will cause shell 2 to split, thus during sintering hollow ball, need
Gradually to cool down, ensure that thermal stress is gradually scattered and disappeared, thermal stress is avoided to remain on too much inside shell 2.
Wherein, the product caused by temperature control is bad of the product in order to avoid hollow ball in sintering process splits or reports
The problems such as useless, in above-mentioned steps S2, high limit temperature threshold is set as 360 DEG C -400 DEG C, lower temperature threshold be set as 60 DEG C -
100℃。
Integrally formed hollow ball can be prepared in the method provided by the invention for making hollow ball, the sky being prepared
Bond line is not present in bulbus cordis, is lost it is possible to prevente effectively from hollow ball in the prior art is easy the product caused by cracking or degumming
The problem of effect.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (7)
1. a kind of mold making hollow ball, it is characterised in that, including:External mold (3), upper mold (4), lower die (5), auxiliary mould (6)
And detent mechanism；
The external mold (3) is set as tubular structure, and external mold (3) inner cavity is set as die cavity, the upper mold (4) and the lower die
(5) separably it is respectively arranged at the upper and lower part of the die cavity；The auxiliary mould (6) be sheathed on the external mold (3) outside with
Position the external mold (3)；The detent mechanism is arranged along the circumferential direction of the external mold (3) and pushes against the liner (1), described
Detent mechanism is for positioning the liner (1).
2. the mold according to claim 1 for making hollow ball, which is characterized in that the detent mechanism includes being set to institute
The female positioning tooth (71) for stating auxiliary mould (6) upper surface, the location hole (72) that is set on the external mold (3) and separably
The location hole (72) is fitted through to push against the auxiliary tool (73) of the liner (1) with female positioning tooth (71).
3. the mold according to claim 2 for making hollow ball, which is characterized in that the auxiliary tool (73) includes and institute
State the sub- positioning tooth (731) of female positioning tooth (71) engagement and along described female positioning tooth (71) and sub- positioning tooth (731) arrangement side
To the gland (732) of setting, the gland (732) passes through the location hole (72) to push against the liner (1).
4. the mold according to claim 3 for making hollow ball, which is characterized in that there are three the detent mechanism settings,
Three detent mechanisms are uniformly distributed in the circumferential direction of the external mold (3).
5. a kind of method using the Mold Making hollow ball according to any one of claims 1-4 for making hollow ball, special
Sign is, includes the following steps：
Step S1, blank production process：
Step S11, feeds for the first time：The lower die (5) is put into the die cavity of the external mold (3), and shell is added into the die cavity
(2) liner (1) is put into die cavity by raw material, and the liner (1) is centrally located in institute using the detent mechanism
It states on the central axes of die cavity；
Step S12, rotates for the first time：The external mold (3) is rotated around the central axes of the external mold (3), so that the shell (2) is former
Material is uniformly distributed around the liner (1)；
Step S13, secondary charging：Shell (2) raw material of other half is added into the die cavity；
Step S14, secondary rotating：The detent mechanism is removed, rotates the external mold again around the central axes of the external mold (3)
(3), so that the shell (2) raw material is uniformly distributed around the liner (1)；
Step S15：Press pressurize：The upper mold (4) is covered on to the top of the lower die (5), and to the external mold (3), institute
Upper mold (4) and the lower die (5) while pressure simultaneously pressurize are stated, is demoulded after the completion of pressurize, obtains green article；
Step S2, sintering circuit：The green article is put into sintering furnace, sintering temperature gradually rises from room temperature to upper limit temperature
Threshold value is spent, then stops heating until the temperature in sintering furnace is gradually decrease to lower temperature threshold, taking-up green article carries out
Natural cooling obtains semi-finished product；
Step S3, post-processing process：The semi-finished product are polished and grinding process, finished product is obtained.
6. it is according to claim 5 make hollow ball method, which is characterized in that in the step S1, for the first time rotation and
The direction of rotation rotated again is opposite.
7. the method according to claim 6 for making hollow ball, which is characterized in that in the step S2, ceiling temperature threshold
Value is set as 360 DEG C -400 DEG C, and lower temperature threshold is set as 60 DEG C -100 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610625290.8A CN106079498B (en) | 2016-08-01 | 2016-08-01 | The method for making the mold of hollow ball and making hollow ball |
Applications Claiming Priority (1)
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Effective date of registration: 20210705 Address after: 325100 Dongou Industrial Zone, Dongou street, Yongjia County, Wenzhou, Zhejiang, China Patentee after: Wenzhou Hengfeng Teflon products Co.,Ltd. Address before: 321000 No.8 Xueyuan Road, Jiangdong Street, Yiwu City, Jinhua City, Zhejiang Province Patentee before: Wang Jun |
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