Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • 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
  • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
  • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
  • B29C45/50—Axially movable screw
• • 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
  • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
  • B29C45/58—Details
  • B29C45/60—Screws

Definitions

• the present invention relates to an injection member and a molding method of a molding machine.
• a resin as a molding material heated and melted in a heating cylinder as a cylinder member is injected at a high pressure to produce a mold apparatus.
• a resin as a molding material heated and melted in a heating cylinder as a cylinder member is injected at a high pressure to produce a mold apparatus.
• the injection molding machine has a mold clamping device and an injection device, and the mold clamping device includes a fixed platen and a movable platen, and the mold device is moved forward and backward by a mold clamping cylinder. The mold is closed, clamped and opened.
• the injection device includes a heating cylinder that heats and melts the resin supplied from the hot tub, and an injection nozzle that injects the molten resin, and the injection cylinder is provided as an injection member.
• the screw is disposed so as to be rotatable and freely movable back and forth.
• the metering motor is driven to rotate the screw, the grease is measured, and the grease supplied from the hopper into the heating cylinder is advanced along a groove formed in the screw. In the meantime, it is melted. Subsequently, when the injection motor is driven and the screw is advanced, the melted resin is injected by the injection nozzle force and filled in the cavity space.
• a supply unit that receives the grease supplied from the hot bar to the heating cylinder to the screw, a compression unit that compresses the grease supplied from the supply unit in front of the supply unit, and the compression unit, A metering unit is formed to meter the resin supplied from the compression unit by a certain amount (see, for example, Patent Document 1) o
• Patent Document 1 JP-A-9 52266
• the present invention solves the problems of the conventional injection device, can shorten the molding cycle and maintenance time, and prevents the occurrence of galling between the cylinder member and the injection member. It is an object of the present invention to provide an injection member for a molding machine and a molding method.
• the injection member is formed through the supply member of the cylinder member via the molding material supply port, and is formed in front of the supply unit.
• a compression unit that melts and compresses the supplied molding material, and a measuring unit that is formed in front of the compression unit and measures the molding material supplied from the compression unit.
• the supply unit includes a pressure adjustment switching point at a predetermined distance behind the front end, and is divided with the pressure adjustment switching point as a boundary. Further, the pressure of the molding material is reduced in the pressure reduction region from the rear end of the supply unit to the pressure adjustment switching point. Then, the pressure of the molding material is adjusted in a pressure adjustment region from the pressure adjustment switching point to the front end of the supply unit.
• the injection member of the molding machine First, a supply part to which the molding material is supplied via the molding material supply port of the cylinder member, and a front part formed from the supply part, A compression unit that melts and compresses the supplied molding material, and a weighing unit that is formed in front of the compression unit and measures the molding material supplied from the compression unit.
• the supply unit includes a pressure adjustment switching point at a predetermined distance behind the front end, and is divided with the pressure adjustment switching point as a boundary. Further, the pressure of the molding material is reduced in the pressure reduction region from the rear end of the supply unit to the pressure adjustment switching point. Then, the pressure of the molding material is adjusted in a pressure adjustment region from the pressure adjustment switching point to the front end of the supply unit.
• the pressure of the molding material is reduced in the pressure reduction region up to the rear end force pressure adjustment switching point of the supply unit, and the pressure from the pressure adjustment switching point to the front end of the supply unit. Since the pressure of the molding material is adjusted in the adjustment region, the density of the molding material moving forward in the pressure reduction region can be gradually reduced. Therefore, it is possible to prevent the pressure in the cylinder member at the compression portion from increasing.
• the temperature of the molding material does not become excessively high due to shear heat generation, the cooling time of the molding material filled in the cavity space can be shortened, and the molding cycle can be shortened.
• the pressure in the cylinder member can be prevented from increasing, the force for pressing the injection member against the inner peripheral surface of the cylinder member does not increase, and a force is applied between the cylinder member and the injection member. It is possible to prevent twisting.
• the molding material can be stably sent to the compression portion.
• FIG. 1 is a schematic view of a main body portion of a screw according to a first embodiment of the present invention.
• FIG. 2 is a conceptual diagram of an injection device according to the first embodiment of the present invention.
• FIG. 3 is a schematic view of a main body portion of a screw according to a second embodiment of the present invention.
• FIG. 4 is a first diagram showing a kneading region in a third embodiment of the present invention.
• FIG. 5 is a second diagram showing a kneading region in the third embodiment of the present invention.
• FIG. 6 is a third diagram showing a kneading region in the third embodiment of the present invention.
• FIG. 1 is a schematic diagram of a main body of a screw according to the first embodiment of the present invention
• FIG. 2 is a conceptual diagram of an injection device according to the first embodiment of the present invention.
• reference numeral 11 denotes a heating cylinder as a cylinder member
• an injection nozzle 12 is attached to the front end (left end in the figure) of the heating cylinder 11
• an annular shape as a plurality of heating members is provided on the outer periphery of the heating cylinder 11.
• the heater 13 is disposed. Also, in the heating cylinder 11
• the screw 14 as the injection member is disposed so as to be rotatable and movable back and forth (movable in the left-right direction in the figure).
• the screw 14 includes a main body portion 15 and a head portion 16 that constitute the main body of the screw 14, and a shaft portion 21 is interposed at the rear end (right end in the figure).
• the driving device 22 includes a metering motor (not shown) as a metering drive unit and an injection motor force (not shown) as an injection drive unit.
• a flight 23 is formed around the body portion 15 by a continuous spiral-shaped protrusion, and a groove 24 is formed by the flight 23.
• the head portion 16 includes a screw head 41 having a conical shape, a rod 42 for connecting the screw head 41 and the main body portion 15, and an annular inverted shape disposed on the outer periphery of the rod 42.
• the stop ring 43 and the check ring 43 are arranged so as to be in contact with the check ring 43, and the seal ring 44 is attached to the main body 15.
• the check ring 43 and the seal ring 44 allow the resin as a molding material melted in the main body part 15 to flow forward (to the left in the figure) of the screw head 41 during the measuring process. In the injection process, it functions as a backflow prevention means for preventing backflow of the grease stored in front of the screw head 41.
• a resin supply port 25 as a molding material supply port is formed at a predetermined position near the rear end of the heating cylinder 11, and a resin as a molding material supply device is formed in the resin supply port 25.
• a fat supply device 71 is provided.
• the resin supply device 71 is arranged in a cylindrical storage for storing the resin so as to face the resin supply port 25 and communicate with the inside of the heating cylinder 11 through the resin supply port 25.
• the resin-like resin is supplied into the heating cylinder 11 through the resin supply port 25.
• the resin feeder 30 includes a case 51 and a valve 52 that is rotatably disposed in the case 51.
• a resin inlet as a molding material inlet is provided at the upper end of the case 51.
• a resin outlet 55 as a molding material outlet is formed at the lower end, and a pocket 53 is formed in the valve 52.
• a level sensor 57 is disposed at a predetermined position in the height direction of the storage cylinder 29, in the present embodiment, at the lower portion of the storage cylinder 29, and the level sensor 57 is disposed in the storage cylinder 29. The level of the resin (the height of the upper end) is detected, and a detection signal is sent to a control device (not shown).
• the control device When the control device receives the detection signal, It is judged whether or not a predetermined amount of resin is stored in the storage cylinder 29, and when the resin in the storage cylinder 29 is reduced, a resin supply motor (not shown) as a drive unit for supplying the resin is driven.
• the valve 52 is rotated by the above, and the pocket 53 is selectively communicated with the resin inlet 54 and the resin outlet 55, whereby the resin in the hopper 31 is supplied to the pocket 53, and the resin in the pocket 53 is The fat is supplied to the storage cylinder 29 through the oil flow path in the intake section 72. Then, the resin stored in the storage cylinder 29 is supplied into the heating cylinder 11 through the resin supply port 25.
• the resin supply port 25 has a rear end portion (right end portion in the drawing) of the groove 24 when the screw 14 is placed at the foremost position in the heating cylinder 11 and is in a state where the screw 14 is placed. It is formed at the opposite location.
• the main body 15 is melted with the supply part Pl supplied with the resin via the resin supply port 25 from the rear (right side in the drawing) to the front, and the resin supplied from the supply part PI.
• a compressing unit P2 that compresses while compressing, and a measuring unit P3 that measures a certain amount of the fat supplied from the compressing unit P2 are sequentially formed. Note that the proportion of the measuring portion P3 in the entire length of the main body portion 15 is approximately 5 to 20%.
• the rotational speed of the metering motor is increased and the screw 14 is rotated at a high speed.
• the pressure in the heating cylinder 11 in the compression part P2 becomes high and the temperature of the resin becomes excessively high due to shear heat generation, the cooling time of the resin filled in the cavity space becomes long, resulting in a long time.
• the molding cycle cannot be shortened.
• a point behind a predetermined distance from the front end of the supply unit P1 is set as a pressure adjustment switching point ql, and the supply unit P1 is set with the pressure adjustment switching point ql as a boundary.
• the pressure at the rear end of the supply section P1 is the pressure reduction area AR1 up to the pressure adjustment switching point ql, and the area from the pressure adjustment switching point ql to the front end of the supply section P1 is used as the second area.
• the pressure adjustment area is AR2.
• the pressure reduction region AR1 is set to a distance of 80 to 95 [%] of the length of the supply portion PI
• the pressure adjustment region AR2 is set to 5 to 20 [length of the supply portion P1. %] Minutes.
• the depth of the groove 24 is made constant, and the outer diameter of the shaft portion 32 of the screw 14 formed by the bottom of the groove 24 is made constant.
• the rear end force of the supply section PI is also directed forward, and the volume of the groove 24 in the section of one lead of flight 23 is defined as Qb, and the pressure adjustment switching point ql force is also directed rearward for one lead of flight 23.
• Qb the volume of the groove 24 in the section of one lead of flight 23
• ql force the pressure adjustment switching point ql force
• the volume Qb in calculating the volume Qb, the rear end of the supply unit P1 is set as the calculation start point si, and the point in front of the rear end force 1 lead of the supply unit P1 is set as the calculation end point el.
• the volume Qb can be calculated by integrating the cross-sectional area of the groove 24 from si to the calculation end point el.
• a predetermined point in the section from the calculation start point si to the calculation end point el for example, the cross-sectional area at the intermediate point, the distance from the calculation start point si to the calculation end point el (the length of one lead) ), That is, the volume Qb can be calculated by multiplying the lead length dl.
• the pressure adjustment switching point ql force 1 point behind the lead is set as the calculation start point sn
• the pressure adjustment switching point ql is set as the calculation end point en
• the calculation start point sn force is also calculated. It is calculated by integrating the cross-sectional area of the groove 24 up to the end point en, or by multiplying the cross-sectional area at a predetermined point from the calculation start point sn to the calculation end point en, for example, the intermediate point by the lead length dn. Or can be calculated.
• each lead length dj is made equal to the lead length dn and made constant over the front end of the pressure adjusting area AR2.
• the depth of the groove 24 is made constant, and the outer diameter of the shaft portion 32 of the screw 14 formed by the bottom of the groove 24 is made constant.
• the flight 23 is powered by the cutter of the machine tool that cuts out the screw 14. Each time the screw 14 is cut by one lead, the angle of the cutter is changed to change the cutting angle. As a result, the pitch of flight 23 can be changed step by step for each lead. [0039] In this way, in the pressure reduction area AR1, the rear end force of the supply unit P1 is also gradually increased in volume for each lead section of flight 23 up to the pressure adjustment switching point q 1, and the volume ratio ⁇ force ⁇ Since it is made larger, the density of the resin moving forward in the pressure reduction area AR1 can be gradually reduced. Therefore, it is possible to prevent the pressure in the heating cylinder 11 at the compression section 2 from becoming high.
• the temperature of the resin does not become excessively high due to shear heat generation, the cooling time of the resin filled in the cavity space can be shortened, and the molding cycle can be shortened. . Further, since the amount of gas generated from the resin can be reduced, it is possible to prevent the mold apparatus from becoming dirty. Accordingly, maintenance and management of the mold apparatus can be easily performed.
• each lead length dp2 is equal to the lead length dn of the pressure reduction area AR1 and is made constant.
• the volume of the groove 24 in the section corresponding to each lead of the flight 23 is gradually reduced. Since it is made smaller, it is possible to compress the fat while sufficiently melting it and send it stably to the measuring section P3. Since the temperature of the resin does not become excessively high in the compression unit P2, the resin can be sent to the measuring unit P3 with the appropriate temperature.
• each lead length dp3 is equal to and constant with the lead length dn of the pressure reducing area AR1.
• the end force is a kneading adjustment area AR3 as the first area
• the kneading adjustment start point q2 is the kneading area AR4 as the second area.
• the normal weighing area AR3 is a distance less than 50% of the length of the weighing part P3
• the kneading area AR4 is a distance of 50% or more of the length of the weighing part P3. .
• a plurality of kneading notches 33 are formed at a predetermined pitch on the outer peripheral edge of the flight 23 as kneading parts in the kneading region AR4.
• the notch 33 is formed so as to extend in the axial direction and penetrate the flight 23.
• the melted resin is advanced along the groove 24 and passes through the notch 33 and moves into the rear groove 24.
• the resin since the resin is circulated between the grooves 24 sandwiching the flight 23 in which the notches 33 are formed, the resin can be sufficiently kneaded.
• each lead length di is gradually increased over the rear end force toward the front end, the depth of the groove 24 is made constant, and the bottom of the groove 24 is formed.
• the rear end force is also made constant at each lead length di toward the front end, and the depth of the groove 24 is gradually increased.
• the outer diameter of the shaft portion 32 can be gradually reduced.
• an annular slit 76 is formed in the intake portion 72 in order to suck the gas that has also generated the grease power in the measurement step.
• the gas is mainly generated in the compression section P2, and the force that is sent to the rear. As described above, the density of the resin in the supply section P1 is lowered, so that the gas is moved backward. It can be sent smoothly.
• FIG. 3 is a schematic view of the main body of the screw according to the second embodiment of the present invention.
• a point that is a predetermined distance behind the front end (left end in the figure) of the compression section P2 (right side in the figure) is set as the degassing adjustment start point q3.
• the compression part P2 is divided at the extraction adjustment start point q3, and the normal compression area AR5 as the first area is defined from the rear end (right end in the figure) of the compression part P2 to the gas extraction adjustment start point q3.
• the gas venting adjustment area AR6 as the second area is defined from the gas venting adjustment start point q3 to the front end of the compression part P2.
• the degassing adjustment area AR6 is formed in an area where mechanical energy and thermal energy are added to a resin not shown as a molding material, and the solid and liquid of the resin are mixed, and the normal compression is performed.
• Area AR5 is 50% of the length of compressed part P2
• the force that makes the full distance and the degassing adjustment area AR6 a distance of 50% or more of the length of the compression part P2 The entire compression part P2 can be made the degassing adjustment area AR6.
• a subflight 34 as a gas vent adjusting member is formed in the gas vent adjusting area AR6 by a spiral continuous protrusion.
• the subflight 34 has a constant lead length dm that is greater than each lead length dp2 of the compression portion P2, and the outer diameter of the subflight 34 is made smaller than the outer diameter of the flight 23.
• the subflight 34 is brought into contact with the front side of the flight 23 at the degassing adjustment start point q3, and the front side force of the flight 23 is also applied from the degassing adjustment start point q3 to the front end of the compression portion P2. Separated and brought into contact with the rear side of flight 23 at the front end of compression section P2. That is, the subflight 34 is extended by dividing the groove 24, and between the front side surface of the flight 23 and the rear side surface of the subflight 34, from the degassing adjustment start point q3 to the front end of the compression portion P2.
• the cross-sectional area gradually increases from the first degassing groove 35 where the cross-sectional area gradually increases between the rear side surface of the flight 23 and the front side surface of the subflight 34 from the degassing adjustment start point q3 to the front end of the compression part P2.
• a narrow second partition groove 36 is formed.
• the sufficiently melted grease can easily move over the subflight 34 and be advanced along the first partition groove 35. Resin that is not sufficiently melted is prevented from being advanced as the second partition groove 36 gradually narrows. Since the shear force is applied to the resin when the subflight 34 is overcome, the resin is further sufficiently melted and preliminarily kneaded.
• FIG. 4 is a first diagram showing a kneading region in the third embodiment of the present invention
• FIG. 5 is a second diagram showing a kneading region in the third embodiment of the present invention
• FIG. 4 is a third view showing a kneading region in the embodiment.
• a kneading flight 61 as a kneading part is formed in place of the flight 23 in the kneading area AR4 (FIG. 3) as the second area.
• the kneading flight 61 is formed by a spiral continuous protrusion, and the lead length dw of the kneading flight 61 is the lead length dp3 of the flight 23 in the normal weighing area AR3 as the first area and the compression part P2.
• the lead length of Freight 23 is shorter than dp2.
• Reference numeral 64 denotes a groove formed along the kneading flight 61.
• a plurality of protrusions 37 as kneading portions are formed in the kneading region AR4 in the circumferential direction in the groove 24 so as to protrude at a predetermined pitch.
• a Maddock-type kneading site is formed from the front end (left end in the figure) to the rear end (right end in the figure).
• the kneading part is composed of first and second protrusions 38 and 39 formed at a predetermined angle with respect to the axial direction.
• the first and second protrusions 38 and 39 are parallel to each other and alternately,
• the present invention is not limited to the above-described embodiment, and can be variously modified based on the gist of the present invention, and does not exclude the scope of the present invention.
• the present invention can be applied to an injection molding machine for molding a molded product.

Landscapes

• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=35782784

Family Applications (1)

Country Status (7)

Cited By (2)

Families Citing this family (5)

Citations (6)

Family Cites Families (6)

• 2005
  • 2005-06-29 TW TW094121834A patent/TW200603982A/zh not_active IP Right Cessation
  • 2005-06-30 JP JP2006528790A patent/JP4694491B2/ja not_active Expired - Fee Related
  • 2005-06-30 US US11/631,165 patent/US20090194897A1/en not_active Abandoned
  • 2005-06-30 KR KR1020067027769A patent/KR20070033387A/ko not_active Ceased
  • 2005-06-30 DE DE112005001425T patent/DE112005001425T5/de not_active Withdrawn
  • 2005-06-30 WO PCT/JP2005/012045 patent/WO2006003977A1/ja not_active Ceased
  • 2005-06-30 CN CN200580021975A patent/CN100588532C/zh not_active Expired - Lifetime

Patent Citations (6)

Also Published As

Similar Documents

Legal Events