CN113290765B

CN113290765B - Be used for rubber hot briquetting mould

Info

Publication number: CN113290765B
Application number: CN202110566614.6A
Authority: CN
Inventors: 李金祥; 吴宗穆
Original assignee: Chongqing Fusheng Technology Co ltd
Current assignee: Chongqing Fusheng Technology Co ltd
Priority date: 2021-05-24
Filing date: 2021-05-24
Publication date: 2022-10-25
Anticipated expiration: 2041-05-24
Also published as: CN113290765A

Abstract

The invention belongs to the field of rubber forming, and particularly relates to a hot-press forming die for rubber. The rubber gasket is arranged between the lower die and the middle die and used for sealing the middle die and the lower die, the cylindrical insert is fixedly connected with the lower die through the positioning groove and the positioning column, a gap is formed between the cylindrical insert and the middle die and communicated with the lower forming cavity, an air suction channel is arranged in the lower die, one end of the air suction channel is communicated with the gap, and the other end of the air suction channel is communicated with an air suction pump. The scheme fixes the plastic model by the gap and the negative pressure of the air suction channel, prevents the plastic model from moving, causes poor products and improves the production efficiency of rubber products; meanwhile, the gas in the forming cavity is reduced, the generation of bubbles in rubber products is reduced, and the rubber forming effect is good.

Description

Be used for rubber hot briquetting mould

Technical Field

The invention belongs to the field of rubber molding, and particularly relates to a hot-press molding die for rubber.

Background

Rubber (Rubber) is a high-elasticity polymer material with reversible deformation, is rich in elasticity at room temperature, can generate large deformation under the action of small external force, and can recover the original shape after the external force is removed. Rubber is a completely amorphous polymer with low glass transition temperature (tg) and often large molecular weight, greater than several hundred thousand.

Early rubbers were latex from plants such as rubber trees, rubber grasses, etc. processed to make elastic, insulative, water and air impermeable materials. Is a highly elastic polymer compound. The rubber is divided into natural rubber and synthetic rubber. The natural rubber is prepared by extracting gum from plants such as rubber tree and Hevea brasiliensis and processing; synthetic rubbers are obtained by polymerization of various monomers. Rubber products are widely used in industry or in various aspects of life.

The application number is CN202010537986.1 and discloses a rubber forming device and a rubber forming die thereof, wherein the rubber forming die comprises a base, a lower die and an upper die, a driving mechanism for driving the upper die and the lower die to open and close is arranged on the base, a cavity is formed between the upper die and the lower die, the driving mechanism comprises a driving strip which is connected to the base in a lifting manner, the driving strip is provided with a step part to form a first top part and a second top part, the upper die is provided with a first extending part pushed by the first top part, and the lower die is provided with a second extending part pushed by the second top part; form first top and second top on the drive strip through setting up the step portion to at first top will go up the mould and push up the realization die sinking at the in-process of die sinking, push up the lower mould again after follow-up second top and the butt of second extension, above-mentioned scheme has realized in step to the time delay of lower mould and has pushed up, and the product separation on the shaping needle on the lower mould and the lower mould is good this moment, and follow-up shaping product takes out the convenience.

Among the above-mentioned scheme, use the shaping to carry out the shaping to the rubber spare, the mode that the shaping needle used the screw is together fixed with the mould, and it is more troublesome that the shaping needle (plastic model) is dismantled to change, frequently changes the shaping needle in-process, can make friction loss between shaping needle and mould, leads to shaping needle offset, leads to the rubber product bad.

Disclosure of Invention

This scheme provides a prevent that plastic model squints is used for rubber hot briquetting mould.

In order to achieve the aim, the scheme provides a rubber hot-press forming die which comprises an upper die and a middle die; the corresponding ends of the upper die and the middle die are provided with upper forming cavities; the corresponding ends of the middle die and the upper die are provided with lower molding cavities, and the lower molding cavities are matched with the upper molding cavities in position; the upper die is provided with a glue injection port communicated with the upper molding cavity; further comprising: a lower die and a cylindrical insert; a rubber gasket for sealing the middle die and the lower die is arranged between the lower die and the middle die; a positioning column is arranged on the lower die; the cylindrical insert is provided with a positioning groove; the positioning groove is matched with the positioning column; the cylindrical insert is positioned in the lower forming cavity; a gap is formed between the cylindrical insert and the middle die and is communicated with the lower forming cavity; an air suction channel is arranged in the lower die, one end of the air suction channel is communicated with a gap, and the other end of the air suction channel is communicated with an air suction pump.

The principle of the scheme is as follows: the cylinder insert is installed on a lower die through the matching of a positioning column and a positioning groove, the middle die is installed on the lower die according to a lower molding cavity and the cylinder insert, a sealing environment is formed between the middle die and the lower die through a sealing rubber ring, a plastic model is placed in the lower molding cavity and is positioned above a gap, the upper die and the middle die are fixed together, an air suction pump is started to suck air, the air suction pump sucks air in the gap and in an air suction channel, negative pressure is formed in the gap, the plastic model is fixed in an adsorption manner, semi-paste rubber is added from an adhesive injection port, the die is heated to enable the rubber and the plastic model to be adhered together, and a rubber product is manufactured.

The scheme has the beneficial effects that: the plastic model is fixed by the gap and the air suction channel, so that the plastic model is prevented from moving, the product is prevented from being defective, and the production efficiency of rubber products is improved; the friction damage to the plastic model caused by screw limiting can be prevented; negative pressure is formed in the gap, gas in the forming cavity is reduced, bubbles in the rubber product are reduced, and the rubber forming effect is good.

Furthermore, the corresponding ends of the upper die and the middle die are provided with grooves; and the corresponding ends of the middle die and the upper die are provided with convex blocks which are matched with the grooves. The upper die and the middle die can be conveniently fixed together, and the direction disorder of the stacked dies can be prevented.

Furthermore, well mould is equipped with the recess that is used for placing the rubber packing ring with the corresponding end of bed die, and the recess is located well mould edge. The rubber gasket is conveniently placed, so that the sealing performance between the middle mold and the lower mold is better.

Further, go up mould, well mould and bed die edge and all be equipped with the guide way, conveniently get and put stack mould and prevent that the mould direction is chaotic.

Furthermore, the number of the upper molding cavities is a plurality; the number of the lower molding cavities is a plurality, and the number of the lower molding cavities corresponds to that of the upper molding cavities. Can simultaneously complete the manufacture of a plurality of rubber products and improve the manufacture efficiency.

Further, the cylindrical insert and the contact surface of the plastic model are provided with carved lines, so that the plastic model is prevented from deforming during vacuum adsorption when the plastic model is thin, and the plastic model can be conveniently taken down.

Further, a cylinder is arranged in the cylindrical insert, a working medium subjected to thermal expansion is filled in the cylinder, and a piston is arranged on the cylinder; the piston is fixedly connected with a moving rod, and the moving rod is arranged on the inner wall of the cylindrical insert in a sliding manner; the movable rod is fixedly connected with a sealing rubber ring, and the sealing rubber ring is positioned in the gap. Heating the mould, the plastic model can soften and plastic model upper end pressure can continuously increase, the aspiration pump continues the operation, the side pressure difference lasts the increase about the plastic model, when the temperature reachd the working medium boiling point, the working medium changes into the gaseous state from liquid state gradually, make the pressure grow in the cylinder, thereby make the piston remove, the piston removes and drives sealed rubber ring and removes, sealed rubber ring removes and seals the clearance in the clearance, make the plastic model downside form a confined space through sealed rubber ring, sealed rubber ring continues the rebound under the action of carriage release lever, compress confined space, make confined space pressure increase, thereby balanced plastic model upside and downside atmospheric pressure, prevent to produce too big suction and make the plastic model of being heated and softened warp, influence rubber product shaping quality.

Furthermore, the gap is trapezoidal, and the sealing rubber ring moves upwards to compress gas, so that the pressure intensity of the sealing space is increased, the air pressure of the upper end and the lower end of the plastic rubber model is balanced, and the negative pressure suction force is prevented from influencing the forming quality of the rubber product.

Drawings

Fig. 1 is a right sectional view of embodiment 1 of the present invention.

Fig. 2 is a front sectional view of embodiment 1 of the present invention.

Fig. 3 is a front sectional view of embodiment 2 of the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the device comprises an upper die 1, a middle die 2, a lower die 3, a cylindrical insert 4, a plastic model 5, a rubber product 6, an air suction channel 7, a gap 8, a positioning column 9, a rubber gasket 10, an air suction pump 11, a cylinder 12, a piston 13, a moving rod 14 and a sealing rubber ring 15.

Example 1:

as shown in the attached drawing 1, the utility model provides a be used for rubber hot briquetting mould, includes mould 1, well mould 2, cylinder mold insert 4 and

bed die

3, and 3 edges of mould 1, well mould 2 and bed die all are equipped with the guide way, conveniently get put the stack mould and prevent that the mould direction is chaotic. The upper mold 1 and the middle mold 2 are provided with upper molding cavities at corresponding ends, the middle mold 2 and the upper mold 1 are provided with lower molding cavities at corresponding ends, the lower molding cavities are matched with the upper molding cavities in position, and the lower molding cavities are matched with the upper molding cavities to manufacture rubber products 6. The number of the upper forming cavities is 12, the number of the lower forming cavities is 12, and the number of the lower forming cavities corresponds to that of the upper forming cavities. Can finish the manufacture of a plurality of rubber products simultaneously and improve the manufacture efficiency.

And the upper die 1 is provided with a glue injection port, the glue injection port is used for injecting semi-paste rubber, and the glue injection port is communicated with the upper molding cavity. The corresponding ends of the upper die 1 and the middle die 2 are provided with grooves, the corresponding ends of the middle die 2 and the upper die 1 are provided with lugs, and the lugs are matched with the grooves. Can conveniently fix the upper die 1 and the middle die 2 together, and can also prevent the disorderly direction of the stacked dies.

The lower die 3 is provided with a positioning column 9, and the cylindrical insert 4 is provided with a positioning groove; the constant head tank cooperatees with reference column 9, and cylinder mold insert 4 is located lower shaping intracavity, has placed plastic model 5 on the cylinder mold insert 4, and plastic model 5 is used for the rubber shaping, and different shape sizes are selected according to the demand to plastic model 5. And adding semi-paste rubber to the plastic model 5 from the rubber injection port, bonding the rubber and the plastic model 5 together when heating the mold, and separating the molded rubber product 6 from the plastic model 5 after cooling.

The cylindrical insert 4 and the contact surface of the plastic model 5 are provided with carved lines, so that the plastic model 5 is prevented from deforming when the plastic model 5 is thin and is adsorbed in vacuum, and meanwhile, the plastic model 5 can be conveniently taken down. As shown in the attached drawing 2, a gap 8 is arranged between the cylindrical insert 4 and the middle mold 2, the gap 8 is communicated with the lower molding cavity, the plastic mold 5 can seal the gap 8 between the cylindrical insert 4 and the middle mold 2, an air suction channel 7 is arranged in the lower mold 3, the gap 8 at one end of the air suction channel 7 is communicated, and the other end of the air suction channel 7 is communicated with an air suction pump 11. Be equipped with the rubber packing ring 10 of mould 2 and bed die 3 in the sealing between bed die 3 and well mould 2, sealed rubber ring makes and forms sealed environment between mould 2 and bed die 3, and well mould 2 is equipped with the recess that is used for placing rubber packing ring 10 with the 3 corresponding ends of bed die, and 2 edges of mould are in the recess is located, conveniently places rubber packing ring 10, and the leakproofness is better between mould 2 and bed die 3 in the messenger.

The gap 8 and the air suction channel 7 form a negative pressure air channel through the plastic model 5 and the sealing rubber ring, and then the air suction pump 11 is started to form negative pressure, so that the plastic model 5 is fixed on the cylindrical insert 4, the plastic model 5 is prevented from moving, the product is prevented from being bad, and the production efficiency of the rubber product 6 is improved; the friction damage to the plastic model 5 caused by the screw limiting can be prevented; negative pressure is formed in the gap 8, gas in the forming cavity is reduced, bubbles in the rubber product 6 are reduced, and the rubber forming effect is good.

The principle of the scheme is as follows: according to the guiding groove position on the lower die 3, the cylindrical insert 4 is installed on the lower die 3 through the matching of the positioning column 9 and the positioning groove, the middle die 2 is installed on the lower die 3 according to the lower molding cavity and the cylindrical insert 4, the number of the upper molding cavity and the lower molding cavity is 12, 12 products can be processed at one time, and the manufacturing efficiency of the rubber product 6 is improved. Place plastic model 5 in lower shaping intracavity again, can conveniently change plastic model 5 at any time as required, make diversified rubber product 6, plastic model 5 is located clearance 8 top, it is together fixed with well mould 2 to go up mould 1, start aspiration pump 11 and bleed, air in aspiration pump 11 extraction clearance 8 and suction channel 7, make and form the negative pressure in the clearance 8, thereby adsorb and fix plastic model 5, add half pasty rubber from the injecting glue mouth again, heat the mould, heating temperature makes rubber and plastic model adhere together for 110 ℃, thereby preparation rubber product 6. The scheme utilizes the gap 8 and the air suction channel 7 to fix the plastic model 5, prevents the plastic model 5 from moving, causes the product badness, and improves the production efficiency of the rubber product 6; the friction damage to the plastic model 5 caused by the screw limiting can be prevented; negative pressure is formed in the gap 8, gas in the forming cavity is reduced, bubbles in the rubber product 6 are reduced, and the rubber forming effect is good.

Example 2:

the difference between this embodiment and embodiment 1 lies in that a negative pressure compensation mechanism is arranged on the cylindrical insert 4, as shown in fig. 3, the negative pressure compensation mechanism includes a cylinder 12 and a sealing rubber ring 15, the cylinder 12 is fixedly connected with the cylindrical insert 4 through a bolt, the cylinder 12 is located in the cylindrical insert 4, a working medium is filled in the cylinder 12, the working medium is chloropropane, a chloropropane colorless liquid has a smell of chloroform, and a boiling point of chloropropane is 47 ℃. The piston 13 is arranged on the cylinder 12, the moving rod 14 is welded on the piston 13, the moving rod 14 is arranged on the inner wall of the cylindrical insert 4 in a sliding mode, the moving rod 14 is welded with the cylinder 12 through a spring, the spring can enable the moving rod 14 to restore to the original position quickly, the moving rod 14 is connected with a sealing rubber ring 15 through a bolt, the sealing rubber ring 15 is made of rubber, the sealing rubber ring 15 is located in the gap 8 after the cylindrical insert 4 is installed on the lower die 3, after the die is heated, when the temperature reaches 47 ℃, chloropropane is gradually changed from liquid state to gas state, the pressure in the cylinder 12 is increased, the piston 13 is accordingly moved, the piston 13 is moved to drive the sealing rubber ring 15 to move, and the sealing rubber ring 15 moves in the gap 8 and seals the gap 8. In the embodiment 1, when the mold is continuously heated to 110 ℃, the plastic mold 5 becomes soft, and when the volume of a certain mass of gas is not changed, the volume expands about 1/273 per 1 ℃ of the temperature rise, so that the pressure intensity of the upper end space of the plastic mold 5 is continuously increased; simultaneously the aspiration pump 11 is not controlled, and the aspiration pump 11 still continues to work, and the aspiration pump 11 continues to extract gas in the clearance 8, and the space pressure at the lower end of the plastic model can continuously reduce, can make the pressure difference of the upper end and the lower end of the plastic model 5 bigger, can produce bigger adsorption affinity in the clearance 8, can make the plastic model 5 warp to can make the rubber product 6 warp easily.

A sealing space is formed at the lower side of the plastic rubber model 5 through the sealing rubber ring 15, the sealing rubber ring 15 continues to move upwards under the action of the moving rod 14 to compress the sealing space, so that the pressure intensity of the sealing space is increased, the air pressure at the upper end and the air pressure at the lower end of the plastic rubber model 5 are balanced, and the influence of excessive suction on the molding quality of the rubber product 6 is prevented; the negative pressure compensating mechanism is more sensitive to the air pressure in the valve control gap 8. The gap 8 is trapezoidal, so that the pressure intensity of the sealed space is increased, the air pressure of the upper side and the lower side of the plastic rubber model 5 is balanced, and the phenomenon that the forming quality of the rubber product 6 is influenced by the excessive negative pressure suction force is prevented.

The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several variations and modifications can be made, which should also be considered as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the utility of the patent. The scope of the claims of the present application shall be defined by the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

1. A hot-press forming die for rubber comprises an upper die (1) and a middle die (2); the corresponding ends of the upper die (1) and the middle die (2) are provided with upper forming cavities; the middle mold (2) and the upper mold (1) are provided with a lower molding cavity at the corresponding ends, and the lower molding cavity is matched with the upper molding cavity in position; the upper die (1) is provided with a glue injection port communicated with the upper molding cavity; it is characterized by also comprising: a lower die (3) and a cylindrical insert (4);

a rubber gasket (10) for sealing the middle die (2) and the lower die (3) is arranged between the lower die (3) and the middle die (2); a positioning column (9) is arranged on the lower die (3);

the cylindrical insert (4) is provided with a positioning groove; the positioning groove is matched with the positioning column (9); the cylindrical insert (4) is positioned in the lower forming cavity; a gap (8) is arranged between the cylindrical insert (4) and the middle die (2), and the gap (8) is communicated with the lower forming cavity; an air suction channel (7) is arranged in the lower die (3), a gap (8) at one end of the air suction channel (7) is communicated, and the other end of the air suction channel (7) is communicated with an air suction pump (11);

the cylinder insert (4) is provided with a negative pressure compensation mechanism, the negative pressure compensation mechanism comprises a cylinder (12) and a sealing rubber ring (15), the cylinder (12) is fixedly connected with the cylinder insert (4) through a bolt, the cylinder (12) is positioned in the cylinder insert (4), the cylinder (12) is filled with a working medium, the working medium is chloropropane, the chloropropane is colorless liquid and has the smell of chloroform, and the boiling point of the chloropropane is 47 ℃; be equipped with piston (13) on cylinder (12), the welding has carriage release lever (14) on piston (13), carriage release lever (14) slide to set up on cylinder mold insert (4) inner wall, carriage release lever (14) are in the same place through spring and cylinder (12) welding, the spring can make carriage release lever (14) quick recovery normal position, carriage release lever (14) bolted connection has sealing rubber ring (15), sealing rubber ring (15) are the rubber material, cylinder mold insert (4) are installed back sealing rubber ring (15) and are located clearance (8) on lower mould (3).

2. The mold for hot-press molding of rubber as set forth in claim 1, wherein: the corresponding ends of the upper die (1) and the middle die (2) are provided with grooves; the middle mould (2) and the upper mould (1) are provided with a convex block at the corresponding end, and the convex block is matched with the groove.

3. The mold for hot-press molding of rubber as set forth in claim 1, wherein: the corresponding end of the middle mold (2) and the lower mold (3) is provided with a groove for placing a rubber gasket (10), and the groove is positioned at the edge of the middle mold (2).

4. The mold for hot-press molding of rubber as set forth in claim 1, wherein: the edges of the upper die (1), the middle die (2) and the lower die (3) are provided with guide grooves.

5. The mold for hot-press molding of rubber as set forth in claim 1, wherein: the number of the upper forming cavities is a plurality; the number of the lower molding cavities is a plurality, and the number of the lower molding cavities corresponds to that of the upper molding cavities.

6. The mold for hot-press molding of rubber as set forth in claim 1, wherein: the contact surface of the cylindrical insert (4) and the plastic model (5) is provided with carving lines.

7. The mold for hot-press molding of rubber as set forth in claim 1, wherein: a cylinder (12) is arranged in the wall of the cylindrical insert (4), a working medium subjected to thermal expansion is filled in the cylinder (12), and a piston (13) is arranged on the cylinder (12); the piston (13) is fixedly connected with a moving rod (14), and the moving rod (14) is arranged on the inner wall of the cylindrical insert (4) in a sliding manner; the moving rod (14) is fixedly connected with a sealing rubber ring (15), and the sealing rubber ring (15) is located in the gap (8).

8. The mold for hot-press molding of rubber as set forth in claim 7, wherein: the gap (8) is trapezoidal.