CN110962314A - Method for reducing stress amplitude of pull rod of injection molding machine during mold closing - Google Patents
Method for reducing stress amplitude of pull rod of injection molding machine during mold closing Download PDFInfo
- Publication number
- CN110962314A CN110962314A CN201911120029.2A CN201911120029A CN110962314A CN 110962314 A CN110962314 A CN 110962314A CN 201911120029 A CN201911120029 A CN 201911120029A CN 110962314 A CN110962314 A CN 110962314A
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- Prior art keywords
- pull rod
- injection molding
- molding machine
- mold
- clamping
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- 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
- B29C45/64—Mould opening, closing or clamping devices
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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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/7653—Measuring, controlling or regulating mould clamping forces
-
- 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
- B29C2945/76177—Location of measurement
- B29C2945/76224—Closure or clamping unit
- B29C2945/7623—Closure or clamping unit clamping or closing drive means
Abstract
The invention discloses a method for reducing the stress amplitude of a pull rod of an injection molding machine during mold closing, which belongs to the technical field of injection molding machines, wherein the injection molding machine is provided with a mold closing mechanism capable of adjusting pretightening force, and the mold closing mechanism is debugged by adopting the following steps before the injection molding machine operates: s1, the position of the movable template or the fixed template on the pull rod is adjusted through the adjustable positioning piece to adjust the deformation force of each pull rod, so that the deformation force of each pull rod reaches the same preset value when the mold is closed; s2, setting the maximum mold clamping force of the injection molding machine, and measuring the maximum deformation force of each pull rod during mold clamping; and S3, setting the pre-tightening mold clamping force of the injection molding machine, measuring the pre-tightening deformation force of each pull rod during mold clamping, and locking the position of the movable mold plate or the positioning plate on the pull rod through the adjustable positioning piece. The invention can greatly reduce the working stress amplitude of the pull rod, generates pretightening force by the die clamping mechanism, does not need additional tools, and does not need a large amount of time for mounting and dismounting the tools.
Description
Technical Field
The invention relates to the technical field of injection molding machines, in particular to a method for reducing the stress amplitude of a pull rod of an injection molding machine during mold closing.
Background
The clamping mechanism of the injection molding machine generally comprises a fixed template, a movable template, a tail plate and a pull rod. The pull rod is fixed through the pull rod nut, and due to the fact that the diameter of the pull rod is large, the nut can only be screwed to a proper position in a conventional mode, but necessary pre-tightening force cannot be generated.
The existing problems are that:
under the condition of no pretightening force, the pull rod bears the pulsating cyclic load and needs to bear the stress amplitude sigma from 0 to the maximum stress, so that the fatigue life performance of the pull rod is highly required. The design requirements are usually met by using alloy steel after heat treatment, which makes the production cost of the pull rod high.
Disclosure of Invention
In view of the above disadvantages in the prior art, the present invention is to provide a method for reducing the stress amplitude of a tie bar during mold closing of an injection molding machine, so as to solve the problem in the prior art that the variation range of the deformation force of the tie bar during mold closing is too large.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for reducing the stress amplitude of a pull rod of an injection molding machine during mold closing is provided, wherein the injection molding machine is provided with a mold closing mechanism, and the mold closing mechanism comprises a fixed mold plate, a movable mold plate, a plurality of elastic pull rods, a plurality of mold locking force sensors and an adjustable positioning piece;
debugging the die assembly mechanism by adopting the following steps before the operation of the injection molding machine:
s1, the position of the movable template or the fixed template on the pull rod is adjusted through the adjustable positioning piece to adjust the deformation force of each pull rod, so that the deformation force of each pull rod reaches the same preset value when the mold is closed;
s2, setting the maximum mold clamping force of the injection molding machine, and measuring the maximum deformation force of each pull rod during mold clamping;
and S3, setting the pre-tightening mold clamping force of the injection molding machine, measuring the pre-tightening deformation force of each pull rod during mold clamping, and locking the position of the movable mold plate or the positioning plate on the pull rod through the adjustable positioning piece.
2. The method of reducing the stress amplitude of tie bars of an injection molding machine during mold closing of the machine of claim 1, wherein: in S1, when the deformation forces of the tie bars are adjusted to the same preset values, the clamping mechanism is first adjusted to a clamping state, and the deformation forces generated by the tie bars are respectively measured by the plurality of clamping force sensors; the deformation force of each pull rod is adjusted by adjusting the position of the movable template or the fixed template on the pull rod through the adjustable positioning piece, and the die opening and die closing and the position action of adjusting the movable template or the fixed template are repeated, so that the deformation force of each pull rod reaches the same preset value during die closing.
Preferably, a plurality of pull rods are arranged in parallel and penetrate through the fixed die plate and the movable die plate, the plurality of die locking force sensors are respectively arranged on the plurality of pull rods, and the adjustable positioning piece is used for positioning the axial position of the movable die plate or the fixed die plate on the pull rods.
Preferably, the adjustable positioning member comprises a draw-bar nut and a ferrule positioning device, and the draw-bar nut and the ferrule positioning device position the fixed die plate or the movable die plate.
Preferably, the pull rod nut and the ferrule positioning device are sleeved on the pull rod.
Preferably, the pull rod nut and the ferrule positioning device are in threaded connection with the pull rod.
Preferably, the pull rod nut and the ferrule positioning device are in threaded connection with the pull rod and position the positioning template at the axial position of the pull rod by clamping.
Preferably, the pull rod is provided with a first positioning groove for positioning a pull rod nut and a second positioning groove for positioning the ferrule positioning device.
Preferably, a gasket with a preset thickness is arranged between the fixed die plate and the pull rod nut or the clamping sleeve positioning device.
The invention can greatly reduce the working stress amplitude of the pull rod, the maximum reduction amplitude exceeds 50 percent, and the pull rod can meet the design requirement by using common steel under the condition. The invention generates pretightening force by the die clamping mechanism, and does not need additional tools, so that the tools do not need to be mounted and dismounted in a large amount of time.
Drawings
Fig. 1 is a schematic structural view of a mold clamping mechanism in example 1.
Fig. 2 is a schematic structural view of the cooperation between the pull rod and the adjustable positioning member in embodiment 1.
Fig. 3 is a schematic view of the deformation force applied to the tie bar in embodiment 3.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
Example 1
Referring to fig. 1-3, the present invention discloses a method for reducing the stress amplitude of a tie bar during the closing of an injection molding machine, wherein the injection molding machine is provided with a closing mechanism 10. The pre-tightening force of the die clamping mechanism 10 can be adjusted, specifically, the pre-tightening force in the die clamping mechanism 10 is adjusted, so that the die clamping mechanism 10 has the initial pre-tightening force, the amplitude of stress borne by the pull rod 4 during die clamping is further reduced, and the service life of the pull rod 4 is prolonged.
The mold clamping mechanism 10 comprises a fixed mold plate 6, a movable mold plate 2, a plurality of elastic pull rods 4, a plurality of mold clamping force sensors 5 and an adjustable positioning piece; the pull rods 4 are arranged in parallel and penetrate through the fixed die plate 6 and the movable die plate 2, the die locking force sensors 5 are respectively arranged on the pull rods 4, and the adjustable positioning piece is used for positioning the axial position of the movable die plate 2 or the fixed die plate 6 on the pull rods 4.
In this embodiment, the adjustable positioning element can adjust the position of the movable die plate 2 or the fixed die plate on the pull rod 4, then position the movable die plate 2 or the fixed die plate through the adjustable positioning element, and adjust the pre-tightening force of the die clamping mechanism 10 by adjusting the position of the movable die plate 2 or the fixed die plate on the pull rod 4, where the pre-tightening force is generated by tensile deformation of the pull rod 4.
The adjustable positioning piece comprises a pull rod nut 1 and a clamping sleeve positioning device, and the pull rod nut 1 and the clamping sleeve positioning device position the fixed die plate 6 or the movable die plate 2. The fixed die plate or the movable die plate 2 is positioned between the pull rod nut 1 and the ferrule positioning device, and the positions of the pull rod nut 1 and the ferrule positioning device on the pull rod 4 are positioned, so that the position of the fixed die plate 6 or the movable die plate 2 on the pull rod 4 can be positioned.
The pull rod nut 1 and the clamping sleeve positioning device are both sleeved on the pull rod 4. The pull rod 4 penetrates through the pull rod nut 1 and the ferrule positioning device, the pull rod nut 1 or the ferrule positioning device is used as a positioning reference point, the position of the fixed template or the movable template 2 on the pull rod 4 is ensured, the position of the adjustable positioning piece on the pull rod 4 is used as the positioning reference point, and the position accuracy of the movable template 2 or the fixed template on the pull rod 4 can be ensured.
The pull rod nut 1 and the clamping sleeve positioning device are in threaded connection with the pull rod 4; the position of the movable template 2 or the fixed template 6 is very well adjusted, the position of the movable template 2 or the fixed template can be adjusted by rotating the pull rod nut 1 and the sleeve chuck positioning device, and then the movable template 2 or the fixed template 6 can be positioned by screwing the pull rod nut 1 and the sleeve chuck positioning device. The pull rod nut 1 and the clamping sleeve positioning device are in threaded connection with the pull rod 4 and position the positioning template at the axial position of the pull rod 4 through clamping.
Example 2
Example 2 differs from example 1 in that:
the pull rod 4 is provided with a first positioning groove for positioning the pull rod nut 1 and a second positioning groove for positioning the ferrule positioning device. And a gasket with preset thickness is arranged between the fixed template and the pull rod nut 1 or the clamping sleeve positioning device. In this embodiment, first, the draw bar nut 1 and the ferrule positioning device are respectively positioned in the first positioning groove and the second positioning groove, the fixed die plate 6 or the movable die plate 2 is positioned between the draw bar nut 1 and the ferrule positioning device, a gasket with a preset thickness is padded between the draw bar nut 1 and the movable die plate 2, or a gasket with a preset thickness is padded between the movable die plate 2 and the ferrule positioning device, so as to adjust the position of the movable die plate 2 on the draw bar 4, and further adjust the deformation stress of the draw bar 4 during die assembly.
Example 3
A method for reducing the stress amplitude of a pull rod 4 of an injection molding machine during mold closing, the mold closing mechanism 10 is debugged before operation by adopting the following steps:
s1, the position of the movable template 2 or the fixed template on the pull rod 4 is adjusted through the adjustable positioning piece to adjust the deformation force of each pull rod 4, so that the deformation force of each pull rod 4 reaches the same preset value when the mold is closed; so that each pull rod 4 keeps consistent deformation force;
s2, setting the maximum mold clamping force of the injection molding machine, and measuring the maximum deformation force F of each pull rod 4 during mold clamping; the maximum mold clamping force here refers to the maximum mold clamping force that can be achieved during mold clamping.
And S3, setting the pre-tightening mold closing force of the injection molding machine, measuring the pre-tightening deformation force Fp of each pull rod 4 during mold closing, and locking the position of the movable mold plate 2 or the positioning plate on the pull rod 4 through the adjustable positioning piece.
In S1, when the deformation forces of the tie bars 4 are adjusted to the same preset value, the clamping mechanism 10 is first adjusted to the clamping state, and the deformation forces generated by the tie bars 4 are respectively measured by the plurality of clamping force sensors 5; the deformation force of each pull rod 4 is adjusted by adjusting the position of the movable template 2 or the fixed template on the pull rod 4 through the adjustable positioning piece, and the die opening and die closing and the position action of adjusting the movable template 2 or the fixed template are repeated, so that the deformation force of each pull rod 4 reaches the same preset value during die closing.
According to the invention, before the injection molding machine operates, the mold clamping mechanism 10 is enabled to have initial pretightening force, so that each pull rod 4 has initial pretightening deformation force Fp, each pull rod 4 can deform during mold clamping, the deformation force of each pull rod 4 gradually changes, when the mold clamping force reaches the maximum, the deformation force F of each pull rod 4 is also the maximum, and compared with the original condition that no pretightening force is set, the stress pair sigma of each pull rod 4 is the maximumPAnd becomes smaller. When no pretightening force is set, the stress pair of the pull rod 4 is sigma, F is sigma, sigmaP＝F-Fp，σ>σP。
The invention can greatly reduce the working stress amplitude of the pull rod 4, the maximum amplitude of the reduction exceeds 50 percent, and the pull rod 4 can meet the design requirement by using common steel under the condition. According to the invention, the pre-tightening force is generated by the die clamping mechanism 10, and no additional tool is needed, so that the tool is not required to be mounted or dismounted in a large amount of time.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (9)
1. A method for reducing the stress amplitude of a pull rod of an injection molding machine during mold closing is provided, wherein the injection molding machine is provided with a mold closing mechanism, and the mold closing mechanism comprises a fixed mold plate, a movable mold plate, a plurality of elastic pull rods, a plurality of mold locking force sensors and an adjustable positioning piece;
debugging the die assembly mechanism by adopting the following steps before the operation of the injection molding machine:
s1, the position of the movable template or the fixed template on the pull rod is adjusted through the adjustable positioning piece to adjust the deformation force of each pull rod, so that the deformation force of each pull rod reaches the same preset value when the mold is closed;
s2, setting the maximum mold clamping force of the injection molding machine, and measuring the maximum deformation force of each pull rod during mold clamping;
and S3, setting the pre-tightening mold clamping force of the injection molding machine, measuring the pre-tightening deformation force of each pull rod during mold clamping, and locking the position of the movable mold plate or the positioning plate on the pull rod through the adjustable positioning piece.
2. The method of reducing the stress amplitude of tie bars of an injection molding machine during mold closing of the machine of claim 1, wherein: in S1, when the deformation forces of the tie bars are adjusted to the same preset values, the clamping mechanism is first adjusted to a clamping state, and the deformation forces generated by the tie bars are respectively measured by the plurality of clamping force sensors; the deformation force of each pull rod is adjusted by adjusting the position of the movable template or the fixed template on the pull rod through the adjustable positioning piece, and the die opening and die closing and the position action of adjusting the movable template or the fixed template are repeated, so that the deformation force of each pull rod reaches the same preset value during die closing.
3. The method of reducing the stress amplitude of tie bars of an injection molding machine during mold closing of the machine of claim 1, wherein: the plurality of pull rods are arranged in parallel and penetrate through the fixed die plate and the movable die plate, the plurality of die locking force sensors are respectively arranged on the plurality of pull rods, and the adjustable positioning piece is used for positioning the axial position of the movable die plate or the fixed die plate on the pull rods.
4. A method of reducing the stress amplitude of tie rods of an injection molding machine during closing of the mold as set forth in claim 3, wherein: the adjustable positioning piece comprises a pull rod nut and a clamping sleeve positioning device, and the pull rod nut and the clamping sleeve positioning device position the fixed die plate or the movable die plate.
5. The method of reducing the stress amplitude of tie bars of an injection molding machine during mold closing of the machine of claim 4, wherein: the pull rod nut and the clamping sleeve positioning device are sleeved on the pull rod.
6. The method of reducing the stress amplitude of tie bars of an injection molding machine during mold closing of the machine of claim 4, wherein: the pull rod nut and the clamping sleeve positioning device are in threaded connection with the pull rod.
7. The method of reducing the stress amplitude of tie bars of an injection molding machine during mold closing of the machine of claim 4, wherein: the pull rod nut and the clamping sleeve positioning device are in threaded connection with the pull rod and position the positioning template at the axial position of the pull rod through clamping.
8. A method of reducing the stress amplitude of tie bars of an injection molding machine during closing of the mold, as claimed in claim 4 or 7, wherein: the pull rod is provided with a first positioning groove for positioning the pull rod nut and a second positioning groove for positioning the ferrule positioning device.
9. The method of reducing the stress amplitude of tie bars of an injection molding machine during closing of a mold as set forth in claim 8, wherein: and a gasket with preset thickness is arranged between the fixed die plate and the pull rod nut or the clamping sleeve positioning device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911120029.2A CN110962314B (en) | 2019-11-15 | 2019-11-15 | Method for reducing stress amplitude of pull rod of injection molding machine during mold closing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911120029.2A CN110962314B (en) | 2019-11-15 | 2019-11-15 | Method for reducing stress amplitude of pull rod of injection molding machine during mold closing |
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| CN110962314B CN110962314B (en) | 2022-05-17 |
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