CN110524802A - Saddle cushion molding die and saddle cushion injection molding process - Google Patents
Saddle cushion molding die and saddle cushion injection molding process Download PDFInfo
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- CN110524802A CN110524802A CN201910650959.2A CN201910650959A CN110524802A CN 110524802 A CN110524802 A CN 110524802A CN 201910650959 A CN201910650959 A CN 201910650959A CN 110524802 A CN110524802 A CN 110524802A
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- Prior art keywords
- saddle cushion
- saddle
- pattern plate
- template
- front template
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- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/34—Moulds having venting means
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76498—Pressure
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76531—Temperature
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76551—Time
- B29C2945/76561—Time duration
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76595—Velocity
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The present invention relates to a kind of saddle cushion molding die and saddle cushion injection molding process, saddle cushion molding die includes back die component, front template, back die component includes rear pattern plate, the rear mold support of rear mold postlaminar part is set, vacuum cavity is formed between rear mold support and rear pattern plate, rear mold support is equipped with the first aspirating hole being connected to vacuum cavity, first aspirating hole is connect with vacuum evacuation device, rear pattern plate is equipped with multiple the second aspirating holes being connected to vacuum cavity, the front of rear pattern plate is arranged in front template, the heat passage of perforation is equipped at the center of front template, pressing plate is equipped between front template and rear pattern plate, the connection of the output end of pressing plate and cylinder, cylinder is mounted on the upper and lower ends of the back die component, the extruded hole of perforation is equipped at the center of pressing plate, the process of saddle cushion injection molding process are as follows: molding-storing Injection-pressure maintaining-cooling-die sinking.Low manufacture cost of the present invention, area occupied be small, high production efficiency, material can reuse.
Description
Technical field
The present invention relates to saddle cushion field shaping techniques, more particularly to a kind of saddle cushion molding die and saddle
Seat cushion injection molding process.
Background technique
Saddle cushion is generally mounted on bicycle, motorcycle and electric vehicle, and existing saddle cushion structure is general
It is made of saddle leather, rubber mat, the production method of saddle cushion is usually to first pass through saddle cushion mold to beat polyurethane foam shape
Generating polyurethane foam pad, it is spare, then foamed urethane pad and saddle leather are bonded using glue.Such production method not only causes
The production efficiency of saddle cushion is low, and production die cost is higher, and polyurethane foam forming production line area occupied is big, to field
Ground requires height, is unfavorable for the development of enterprise.In addition, the polyurethane material of foaming cannot recycle, result in waste of resources,
And the polyurethane material of foaming is not easily decomposed, and it is general by the way of burning or filling, it has greater environmental impacts.
Summary of the invention
To solve the above problems, the present invention provides, a kind of low manufacture cost, area occupied be small, high production efficiency, material energy
The saddle cushion molding die and saddle cushion injection molding process enough reused.
The present invention provides a kind of saddle cushion molding die, including back die component, front template, and the back die component includes
Rear pattern plate, the rear mold support that rear mold postlaminar part is arranged in form vacuum cavity between the rear mold support and rear pattern plate, after described
Mould support is equipped with the first aspirating hole being connected to vacuum cavity, and first aspirating hole is connect with vacuum evacuation device, after described
Template is equipped with multiple the second aspirating holes being connected to vacuum cavity, and the front of rear pattern plate is arranged in the front template, before described
The heat passage of perforation is equipped at the center of template, the heat passage is connected to the exit wound of bullet of hot runner system, the preceding mould
Pressing plate, the output end connection of the pressing plate and cylinder are equipped between plate and rear pattern plate, the cylinder is mounted on the back die component
Upper and lower ends, the extruded hole of perforation is equipped at the center of the pressing plate, it is described when the front template and back die component fasten
Front template passes through extruded hole and rear pattern plate fastens and formed forming recess, and the heat passage is connected to forming recess.
Preferably, recess portion is equipped at the front end center of the rear pattern plate, the rear end of the front template is equipped with and recess portion shape
The shape of the identical protrusion of shape, the recess portion and protrusion is the shape of required molding saddle cushion, the protrusion size
Less than recess portion size.
It is preferably in any of the above-described scheme, the heat passage includes the first branched bottom, the second branched bottom and note
Mouth is moulded, first branched bottom is symmetrical arranged and is connected to respectively with the injection hole, described first point with the second branched bottom
The rear end of front template is arranged in subchannel and the second branched bottom, and the front end of front template is arranged in the injection hole.
It is preferably in any of the above-described scheme, is equipped with constant temperature system, the constant temperature system positioned at the two sides of the heat passage
System is arranged in front template.
The present invention also provides a kind of saddle cushion injection molding process, include the following steps:
S1, molding: pressing plate is separated with rear pattern plate, saddle leather tiling is placed on rear mold template chamber, saddle leather is pressed on by pressing plate
On rear mold template chamber, the intracorporal air of vacuum chamber is extracted out, makes to form vacuum state between saddle leather and rear mold template chamber, using big
Saddle leather is adsorbed on rear mold template chamber by air pressure, and front template passes through the extruded hole on pressing plate and fastens to form molding type with rear pattern plate
Chamber；
S2, thermoplastic elastomer substrate, foaming agent are dried；
S3, storing: the thermoplastic elastomer substrate of drying being stirred with foaming agent and is mixed, and obtains foaming agent and heat
Mixed material is sent into expects pipe by the mixed material of plastic rubber substrate according to each required molding amount, and in expects pipe
Mixed material is heated, while the discharge end for being delivered to expects pipe is stirred by the screw rod in expects pipe, with what is melted
Mixed material；
S4, injection: the mixed material of melting is continuously sprayed to forming recess through heat passage, thermoplastic elastomer substrate
Foamable reaction is carried out in forming recess；
S5, pressure maintaining: pressure maintaining is carried out to the feed liquid in forming recess；
S6, cooling: being cooled and shaped the feed liquid in forming recess, and rubber mat is consequently formed, and the temperature of shaping mold cavity is
65~75 DEG C, cooling time is 50~60s；
S7, die sinking: after the completion of injection molding, rubber mat and saddle leather are integrally formed, and front template is separated with back die component, pressing plate and
Product is taken out after rear pattern plate separation, saddle cushion is thus made.
Preferably, in step S2, the drying temperature of the thermoplastic elastomer substrate and foaming agent is 70 DEG C, drying time
For 2h.
It being preferably in any of the above-described scheme, in step S3, plasticization temperature of the mixed material in expects pipe is divided into five sections, according to
Secondary is 155 DEG C, 180 DEG C, 185 DEG C, 185 DEG C, 190 DEG C, wherein the stock pressure 90MPA of every section of plasticizing process, speed
90cm3/ s, time 5.1s.
It is preferably in any of the above-described scheme, in step S4, the injection time is 15s, pressure 5MPA, speed 15cm3/s。
It is preferably in any of the above-described scheme, in step S5, dwell pressure 5MPA, speed 5cm3/ s, time 15s.
It is preferably in any of the above-described scheme, in the step S3, softening oil is additionally added into expects pipe, wherein press quality
0.05 part of the softening oil is added in number meter.
Compared with prior art, it advantage for present invention and has the beneficial effect that
1, existing foamed urethane pad is substituted by using fretting map thermoplastic elastomer, and uses injection molding process system
Make saddle cushion, can be realized the one-pass molding to saddle leather and rubber mat, without carrying out secondary bonding, molding saddle cushion
Structural stability is strong, and makes molding simply, and shaping efficiency is high, and the cost for making molding die is low, reduces production cost, improves
The production efficiency of saddle cushion.
2, elder generation's storing injection again when the injection molding of saddle cushion shortens residence time of the mixing material in expects pipe, In
Injection, guarantee foaming agent are activated in advance in expects pipe, spray to forming recess, thermoplastic elastomer base immediately after the completion of storing
Material and foaming agent continue foamable reaction, can guarantee product elastic property obtained, prevent mixing material in advance in expects pipe
Interior completion foamable reaction, to guarantee the foaming quality and Forming Quality of saddle cushion, simultaneously as thermoplastic elastomer substrate
Microporous foam, foamed time is short, shortens the formed product manufacturing cycle.
3, when carrying out foamable reaction, if temperature is excessively high, it will lead to foamable reaction stopping, if temperature is too low, leading
Cause foamable reaction incomplete, in storing, by using successively passing when thermoplastic elastomer substrate mixes in expects pipe with foaming agent
The heating temperature of increasing makes foamable reaction continue to carry out, guarantees the foaming effect of material.
4, physical change occurs between thermoplastic elastomer substrate and foaming agent, is formed by fretting map thermoplastic elastomer category
In plastic material, material properties is constant, and metamorphosis only occurs, and can reuse, and makes with using polyurethane foam material
Saddle cushion is compared, and manufacturing cost is low, and effect on environment is small.Thermoplastic elastomer substrate is mixed with foaming agent, reduces heat
The density of plastic rubber substrate, makes that obtained saddle cushion light weight, elastic property is good, density is small.
5, foaming agent, by the way that a small amount of softening oil is added, can guarantee foaming agent with thermoplastic elastomer substrate when mixing
It is preferably mixed with thermoplastic elastomer substrate, to guarantee the foam performance of thermoplastic elastomer substrate.
With reference to the accompanying drawing to saddle cushion molding die of the invention and saddle cushion injection molding process make into
One step explanation.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of saddle cushion molding die of the present invention；
Fig. 2 is the structural schematic diagram that saddle leather is pressed on rear mold template chamber in saddle cushion molding die of the present invention；
Fig. 3 is the structural schematic diagram that front template and back die component fasten in saddle cushion molding die of the present invention；
Fig. 4 is the molding structural schematic diagram of saddle cushion in saddle cushion molding die of the present invention；
Wherein: 1, rear mold support；2, vacuum cavity；3, the first aspirating hole；4, cylinder；5, rear pattern plate；51, the second pumping
Hole；52, recess portion；6, pressing plate；61, extruded hole；7, front template；71, stencil body；72, convex block is compressed；73, the first branched bottom；
74, the second branched bottom；75, injection hole；76, constant temperature system；8, saddle leather；9, hot runner system.
Specific embodiment
Embodiment one
As shown in Figure 1, the present invention provides a kind of saddle cushion molding die, including back die component, front template 7, rear mold
Component includes rear pattern plate 5, the rear mold support 1 that 5 rear portion of rear pattern plate is arranged in, and forms vacuum chamber between rear mold support 1 and rear pattern plate 5
Body 2, rear mold support 1 are equipped with the first aspirating hole 3 being connected to vacuum cavity 2, and the first aspirating hole 3 is connect with vacuum evacuation device,
Rear pattern plate 5 is equipped with multiple the second aspirating holes 51 being connected to vacuum cavity 2, and the front of rear pattern plate 5 is arranged in front template 7, preceding
The heat passage of perforation is equipped at the center of template 7, heat passage is connected to the exit wound of bullet of hot runner system 9, front template 7 and
Pressing plate 6 is equipped between rear pattern plate 5, pressing plate 6 is connect with the output end of cylinder 4, and cylinder 4 is mounted on the upper and lower ends of back die component,
The extruded hole 61 of perforation is equipped at the center of pressing plate 6, when current template 7 and back die component fasten, front template 7 passes through extruded hole 61
It is fastened with rear pattern plate 5 and forms forming recess, heat passage is connected to forming recess.
As Figure 1-Figure 4, the forming process of saddle cushion are as follows: firstly, pressing plate 6 is divided by cylinder 4 with rear pattern plate 5
From, by saddle leather 8 tiling be placed on 5 type chamber of rear pattern plate；Secondly, saddle leather 8 is pressed on 5 type chamber of rear pattern plate by cylinder 4 by pressing plate 6
On, and extracted out the air in vacuum cavity 2 by vacuum evacuation device, make to form vacuum shape between 5 type chamber of saddle leather 8 and rear pattern plate
Saddle leather 8 is adsorbed on 5 type chamber of rear pattern plate by state using atmospheric pressure；Again, front template 7 pass through pressing plate 6 on extruded hole 61 with
The fastening of rear pattern plate 5 forms forming recess, injection molding machine nozzle by hot runner system 9 through heat passage the injection material into forming recess
Liquid, feed liquid is in the intracavitary cooling and shaping of type, to realize the one-pass molding to saddle leather 8 and rubber mat, without carrying out secondary bonding, forms
Saddle cushion structure stability it is strong, and make that molding is simple, and shaping efficiency is high, and the cost for making molding die is low, reduce
Production cost improves the production efficiency of saddle cushion.Wherein, when vacuumizing, guarantee evacuated pressure in a normal atmosphere
Pressure.Wherein, front template 7 is mounted on the preceding mold mounting plate of injection molding machine, and rear mold support 1 is mounted on the rear mold mounting plate of injection molding machine
On.After saddle cushion injection molding, front template 7 is separated with back die component, and pressing plate 6 is separated by cylinder 4 with rear pattern plate 5, people
Work takes out molding saddle cushion.
It is equipped with constant temperature system 76 positioned at the two sides of heat passage, constant temperature system 76 is arranged in front template 7.Constant temperature system 76
For controlling the forming temperature of forming recess, guarantee the Forming Quality of saddle cushion.Hot runner system 9 guarantees in heat passage
Feed liquid it is in a molten state, be not in feed back in rubber mat forming process, reduce the loss of moulding material, to reduce life
Produce cost.What the present embodiment, hot runner system 9 and constant temperature system 76 were selected is injection molding art conventional structure, internal structure, work
Making principle all is this field disclosed prior art.
Further, heat passage includes the first branched bottom 73, the second branched bottom 74 and injection hole 75, the first branch
Channel 73 is symmetrical arranged and is connected to respectively with the injection hole 75, the first branched bottom 73 and second with the second branched bottom 74
The rear end of front template 7 is arranged in branched bottom 74, and the front end of front template 7 is arranged in injection hole 75.The structure of heat passage designs
Guarantee that feed liquid can be rapidly and uniformly full of in forming recess.
Further, the two sides up and down of 5 front end of rear pattern plate are equipped with locating piece.In the present embodiment, locating piece is using pin.
When the tiling of saddle leather 8 is placed on 5 type chamber of rear pattern plate, saddle leather 8 is equipped with the location hole with bayonet fittings, to realize to saddle leather 8
Positioning.
Further, recess portion 52 is equipped at the front end center of rear pattern plate 5, the rear end of front template 7 is equipped with and 52 shape of recess portion
The shape of identical protrusion, recess portion 52 and protrusion is the shape of required molding saddle cushion, and protrusion size is less than recess portion
52 sizes.When rear pattern plate 5 and front template 7 fasten, forming recess is formed between recess portion 52 and protrusion.
Further, front template 7 includes integrally formed stencil body 71 and compresses convex block 72, and protrusion is arranged in template sheet
The rear end of body 71, hot runner system 9 are arranged on stencil body 71, compress convex block 72 and are separately positioned on the upper of stencil body 71
Lower both ends.Cross-sectional length size, the cross-sectional length size of extruded hole 61, the cross-sectional length size of stencil body 71 of rear pattern plate 5
Successively successively decrease.When front template 7 and rear pattern plate 5 fasten, compressing convex block 72 can be bonded with pressing plate 6 and compress to pressing plate 6 solid
It is fixed, it thereby guarantees that the sealing performance of forming recess, prevents moulding material from leaking outside.
Further, vacuum means are set to vacuum pump.
It further, is to be detachably fixed connection between rear pattern plate 5 and rear mold support 1.
In the present embodiment, front template 7, back die component are all made of mould steel material and are made.
Embodiment two
The present invention also provides a kind of saddle cushion injection molding process, include the following steps:
S1, molding: pressing plate 6 is separated with rear pattern plate 5, the tiling of saddle leather 8 is placed on 5 type chamber of rear pattern plate, pressing plate 6 is by saddle leather 8
It is pressed on 5 type chamber of rear pattern plate, the air in vacuum cavity 2 is extracted out, makes to form vacuum between 5 type chamber of saddle leather 8 and rear pattern plate
Saddle leather 8 is adsorbed on 5 type chamber of rear pattern plate by state using atmospheric pressure, and front template 7 passes through extruded hole 61 and rear mold on pressing plate 6
The fastening of plate 5 forms forming recess；
S2, thermoplastic elastomer substrate, foaming agent are dried, the drying temperature of thermoplastic elastomer substrate and foaming agent is
70 DEG C, drying time 2h；Wherein, according to the mass fraction, foaming agent is 1~5 point, the model DF-105 used (white
Powder), decomposition temperature: 155-185 DEG C ± 5 DEG C, gas forming amount: 175-190ml/g.
S3, storing: the thermoplastic elastomer substrate of drying being stirred with foaming agent and is mixed, and obtains foaming agent and heat
Mixed material is sent into expects pipe by the mixed material of plastic rubber substrate according to each required molding amount, while into expects pipe
It is additionally added softening oil, wherein according to the mass fraction, it is added 0.05 part of softening oil, and heat to the mixed material in expects pipe,
Plasticization temperature of the mixed material in expects pipe is divided into five sections, is followed successively by 155 DEG C, 180 DEG C, 185 DEG C, 185 DEG C, 190 DEG C, every section of modeling
The stock pressure 90MPA of change process, speed 90cm3/s, time 5.1s, while being stirred and being delivered to by the screw rod in expects pipe
The discharge end of expects pipe, with the mixed material melted, at this point, foaming agent is activated；
S4, injection: the mixed material of melting is continuously sprayed to forming recess through heat passage, thermoplastic elastomer substrate
Foamable reaction is carried out in forming recess, at this point, the fretting map thermoplastic elastomer full of melting in forming recess, wherein injection
Time is 15s, pressure 5MPA, speed 15cm3/s；
S5, pressure maintaining: pressure maintaining is carried out to the feed liquid in forming recess, thermoplastic elastomer substrate continues in forming recess
Foamable reaction, at this point, the fretting map thermoplastic elastomer full of melting in forming recess, wherein dwell pressure 5MPA, speed
5cm3/s, time 15s；
S6, cooling: being cooled and shaped the feed liquid in forming recess, is consequently formed as fretting map thermoplastic elastomer material
Rubber mat, wherein the temperature of shaping mold cavity be 65~75 DEG C, cooling time be 50~60s；
S7, die sinking: after the completion of injection molding, rubber mat and saddle leather 8 are integrally formed, and front template 7 is separated with back die component, pressing plate
6 separated with rear pattern plate 5 after take out product, thus be made saddle cushion.
In the present embodiment, in storing, first the thermoplastic elastomer substrate of drying, foaming agent and softening oil are stirred mixed
It closes, at this point, not heating to above-mentioned mixing material, also there is no any reactions between each material, when each material is being expected
When being heated in pipe, foaming agent is activated, and thermoplastic elastomer substrate starts to carry out foamable reaction, when each material is in the work of screw rod
When being delivered to the discharge end of expects pipe with lower stirring, injection is carried out immediately, the mixed material of melting is sprayed to forming recess, and
Pressure maintaining is carried out, in pressure maintaining period, thermoplastic elastomer substrate and foaming agent persistently carry out foamable reaction, make thermoplastic elastomer substrate
Foaming completely, with the fretting map thermoplastic elastomer melted, guarantees the quality that saddle cushion is made.
Wherein, the thermoplastic elastomer substrate in the present embodiment, according to the mass fraction, including following components,
SEBS:53~63 part, softening oil: 37~43 parts, antioxidant: 0.1~0.3 part.
Antioxidant uses phosphite ester, and softening oil uses paraffin oil.
The preparation method of thermoplastic elastomer substrate, includes the following steps:
The first step, ingredient stirring: first SEBS is added to agitated kettle and is stirred, then softening oil, antioxidant are added to stirring
In pot, stirring is uniformly mixed with SEBS；Wherein, SEBS additional amount is accurate to 0.01KG, and softening oil, added quantity of antioxidant are accurate to
0.001KG, above-mentioned each material are stirred with the speed of 6 circle per minute, mixing time sets itself, with the agitator of 500KG
For, the mixing time generally set is 30 minute.
Second step, extruding pelletization: the material being uniformly mixed in step S1 is added to the hopper of pelletizer, and is led to
The heater crossed outside pelletizer carries out the material in hopper to be heated to molten condition, and the material of melting is simultaneously delivered to pelletizer
Mouth mold in, then by the cooling and shaping device of pelletizer the material melted in mouth mold is cooled down, is obtained and Oral incision
Similar material shape, then the material of sizing is delivered in stock-cutter, granular material is obtained to get thermoplastic elastomer base is arrived
Material；It wherein, is 195~205 DEG C to the heating temperature of material in hopper, the cooling temperature to melted material in mouth mold is 0~20
℃。
When preparing thermoplastic matrix, by the way that phosphite antioxidant is added, anti-extractibility is strong, steady to hydrolysis
It is fixed, and there is good color protective capability, the photostability of product can be significantly improved.By the way that paraffin oil is added, make to be made
Fretting map thermoplastic rubber material heat resistance, illumination performance it is good, volatility is few, have good weatherability, extend micro- hair
The service life of thermoplastic elastomer is steeped, and the cost of material is low.
Compared with prior art, it advantage for present invention and has the beneficial effect that
1, existing foamed urethane pad is substituted by using fretting map thermoplastic elastomer, and uses injection molding process system
Make saddle cushion, can be realized the one-pass molding to saddle leather 8 and rubber mat, without carrying out secondary bonding, molding saddle buffering
Mat structure stability is strong, and makes molding simply, and shaping efficiency is high, and the cost for making molding die is low, reduces production cost, mentions
The production efficiency of high saddle cushion.
2, elder generation's storing injection again when the injection molding of saddle cushion shortens residence time of the mixing material in expects pipe, In
Injection, guarantee foaming agent are activated in advance in expects pipe, spray to forming recess, thermoplastic elastomer base immediately after the completion of storing
Material and foaming agent continue foamable reaction, can guarantee product elastic property obtained, prevent mixing material in advance in expects pipe
Interior completion foamable reaction, to guarantee the foaming quality and Forming Quality of saddle cushion, simultaneously as thermoplastic elastomer substrate
Microporous foam, foamed time is short, shortens the formed product manufacturing cycle.And traditional Shooting Technique process is first penetrated in injection molding
Storing, material need that next injection cycle is waited to start to project in expects pipe glue again, thus extend feed liquid in expects pipe
Residence time, cause material to be previously-completed foamable reaction in expects pipe, due to the given volume of expects pipe, if material is in expects pipe
Residence time is too long, then hinders thermoplastic elastomer substrate foaming and intumescing, causes to can not form bubble in thermoplastic elastomer substrate, and material
The temperature that material foams needed for having reached in expects pipe, causes thermoplastic elastomer substrate to be burnt in expects pipe, to make to be made
Product elasticity it is small.
3, when carrying out foamable reaction, if temperature is excessively high, it will lead to foamable reaction stopping, if temperature is too low, leading
Cause foamable reaction incomplete, in storing, by using successively passing when thermoplastic elastomer substrate mixes in expects pipe with foaming agent
The heating temperature of increasing makes foamable reaction continue to carry out, guarantees the foaming effect of material.
4, physical change occurs between thermoplastic elastomer substrate and foaming agent, is formed by fretting map thermoplastic elastomer category
In plastic material, material properties is constant, and metamorphosis only occurs, and can reuse, and makes with using polyurethane foam material
Saddle cushion is compared, and manufacturing cost is low, and effect on environment is small.Thermoplastic elastomer substrate is mixed with foaming agent, reduces heat
The density of plastic rubber substrate, makes that obtained saddle cushion light weight, elastic property is good, density is small.
5, foaming agent, by the way that a small amount of softening oil is added, can guarantee foaming agent with thermoplastic elastomer substrate when mixing
It is preferably mixed with thermoplastic elastomer substrate, to guarantee the foam performance of thermoplastic elastomer substrate.
Embodiment described above only describe the preferred embodiments of the invention, not to model of the invention
It encloses and is defined, without departing from the spirit of the design of the present invention, those of ordinary skill in the art are to technical side of the invention
The various changes and improvements that case is made should all be fallen into the protection scope that claims of the present invention determines.
Claims (10)
1. a kind of saddle cushion molding die, it is characterised in that: including back die component, front template, the back die component includes
Rear pattern plate, the rear mold support that rear mold postlaminar part is arranged in form vacuum cavity between the rear mold support and rear pattern plate, after described
Mould support is equipped with the first aspirating hole being connected to vacuum cavity, and first aspirating hole is connect with vacuum evacuation device, after described
Template is equipped with multiple the second aspirating holes being connected to vacuum cavity, and the front of rear pattern plate is arranged in the front template, before described
The heat passage of perforation is equipped at the center of template, the heat passage is connected to the exit wound of bullet of hot runner system, the preceding mould
Pressing plate, the output end connection of the pressing plate and cylinder are equipped between plate and rear pattern plate, the cylinder is mounted on the back die component
Upper and lower ends, the extruded hole of perforation is equipped at the center of the pressing plate, it is described when the front template and back die component fasten
Front template passes through extruded hole and rear pattern plate fastens and formed forming recess, and the heat passage is connected to forming recess.
2. saddle cushion molding die according to claim 1, it is characterised in that: at the front end center of the rear pattern plate
Equipped with recess portion, the rear end of the front template is equipped with protrusion identical with recess shapes, and the shape of the recess portion and protrusion is required
The shape of saddle cushion is formed, the protrusion size is less than recess portion size.
3. saddle cushion molding die according to claim 1, it is characterised in that: the heat passage includes first point
Subchannel, the second branched bottom and injection hole, first branched bottom and the second branched bottom be symmetrical arranged and respectively with institute
Injection hole connection is stated, the rear end of front template, the injection hole setting is arranged in first branched bottom and the second branched bottom
In the front end of front template.
4. saddle cushion molding die according to claim 1, it is characterised in that: positioned at the two sides of the heat passage
Equipped with constant temperature system, the constant temperature system is arranged in front template.
5. a kind of saddle cushion injection molding process, characterized by the following steps:
S1, molding: pressing plate is separated with rear pattern plate, saddle leather tiling is placed on rear mold template chamber, saddle leather is pressed on rear mold by pressing plate
On template chamber, the intracorporal air of vacuum chamber is extracted out, makes to form vacuum state between saddle leather and rear mold template chamber, utilizes atmospheric pressure
Saddle leather is adsorbed on rear mold template chamber, front template passes through the extruded hole on pressing plate and fastens to form forming recess with rear pattern plate；
S2, thermoplastic elastomer substrate, foaming agent are dried；
S3, storing: the thermoplastic elastomer substrate of drying is stirred with foaming agent and is mixed, foaming agent and thermoplasticity are obtained
Mixed material is sent into expects pipe by the mixed material of rubber substrate according to each required molding amount, and to the mixing in expects pipe
Material is heated, while the discharge end for being delivered to expects pipe is stirred by the screw rod in expects pipe, with the mixing melted
Material；
S4, injection: the mixed material of melting is continuously sprayed to forming recess through heat passage, thermoplastic elastomer substrate at
The intracavitary carry out foamable reaction of type type；
S5, pressure maintaining: pressure maintaining is carried out to the feed liquid in forming recess；
S6, cooling: being cooled and shaped the feed liquid in forming recess, is consequently formed rubber mat, and the temperature of shaping mold cavity is 65~
75 DEG C, cooling time is 50~60s；
S7, die sinking: after the completion of injection molding, rubber mat and saddle leather are integrally formed, and front template is separated with back die component, pressing plate and rear mold
Product is taken out after plate separation, saddle cushion is thus made.
6. saddle cushion injection molding process according to claim 5, it is characterised in that: in step S2, the thermoplastic
Property rubber substrate and foaming agent drying temperature be 70 DEG C, drying time 2h.
7. saddle cushion injection molding process according to claim 5, it is characterised in that: in step S3, mixed material
Plasticization temperature in expects pipe is divided into five sections, is followed successively by 155 DEG C, 180 DEG C, 185 DEG C, 185 DEG C, 190 DEG C, wherein every section of plasticizing
The stock pressure 90MPA of process, speed 90cm3/ s, time 5.1s.
8. saddle cushion injection molding process according to claim 5, it is characterised in that: in step S4, the injection time
For 15s, pressure 5MPA, speed 15cm3/s。
9. saddle cushion injection molding process according to claim 5, it is characterised in that: in step S5, dwell pressure
5MPA, speed 5cm3/ s, time 15s.
10. saddle cushion injection molding process according to claim 5, it is characterised in that: in the step S3, to material
Softening oil is additionally added in pipe, wherein according to the mass fraction, 0.05 part of the softening oil is added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910650959.2A CN110524802A (en) | 2019-07-18 | 2019-07-18 | Saddle cushion molding die and saddle cushion injection molding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910650959.2A CN110524802A (en) | 2019-07-18 | 2019-07-18 | Saddle cushion molding die and saddle cushion injection molding process |
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| Publication Number | Publication Date |
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| CN110524802A true CN110524802A (en) | 2019-12-03 |
Family
ID=68660623
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910650959.2A Pending CN110524802A (en) | 2019-07-18 | 2019-07-18 | Saddle cushion molding die and saddle cushion injection molding process |
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| CN117382112A (en) * | 2023-12-12 | 2024-01-12 | 天津嘉思特车业股份有限公司 | Saddle leather sheath manufacturing process with small inner side and large outer side |
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