CN110548854B - Forging control method for metal product - Google Patents
Forging control method for metal product Download PDFInfo
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- CN110548854B CN110548854B CN201911011911.3A CN201911011911A CN110548854B CN 110548854 B CN110548854 B CN 110548854B CN 201911011911 A CN201911011911 A CN 201911011911A CN 110548854 B CN110548854 B CN 110548854B
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- injection
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- oil cylinder
- control method
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000002184 metal Substances 0.000 title claims abstract description 36
- 238000005242 forging Methods 0.000 title claims abstract description 13
- 238000002347 injection Methods 0.000 claims abstract description 117
- 239000007924 injection Substances 0.000 claims abstract description 117
- 238000004512 die casting Methods 0.000 claims abstract description 33
- 239000000243 solution Substances 0.000 claims abstract description 23
- 238000005266 casting Methods 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 238000006073 displacement reaction Methods 0.000 claims abstract description 8
- 230000007246 mechanism Effects 0.000 claims abstract description 8
- 239000002893 slag Substances 0.000 claims abstract description 7
- 230000008859 change Effects 0.000 claims description 32
- 230000008569 process Effects 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 8
- 230000009467 reduction Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 abstract description 2
- 230000035772 mutation Effects 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 7
- 230000007704 transition Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002352 surface water Substances 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/32—Controlling equipment
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a forging control method of a metal product, which is characterized in that a pressure sensor is arranged on an injection mechanism of a die casting machine, the pressure sensor detects pressure values of each injection section and feeds the pressure values back to a control system of the die casting machine to form a pressure, speed and displacement curve chart, and the control method comprises the following steps: a. and c, when the metal solution enters 1/2 or 1/3 of a slag ladle, entering a pressurizing injection stage to enable the metal solution to be continuously injected into the die cavity. Compared with the prior art, the method starts the rapid injection through pressure mutation, and starts the pressurized injection by combining the flow detection device and the pressure sensor, so that the method for setting the trigger position of the rapid injection manually by experience or simple theoretical calculation is greatly changed, and the casting quality of the product is ensured.
Description
Technical Field
The invention relates to the technical field of die casting machines, in particular to a forging control method for a metal product.
Background
The die casting machine is a machine for pressure casting, which injects molten metal liquid under pressure into a mold to cool and mold, and after opening the mold, a solid metal casting can be obtained. The existing die casting machine mainly comprises a die assembly mechanism, an injection mechanism, a hydraulic system, an electric control system and the like.
The injection process of the die casting machines on the market today generally comprises four phases: 1) a slow injection stage; 2) a rapid injection stage; 3) and (5) pressurizing and injecting. The displacement, pressure and speed of each injection stage are different, and the cutting-in time of each injection stage has great influence on the product quality in the injection process of the die-casting machine, so that the correct setting of the cutting-in time of each injection stage is very important.
At the present stage, all die casting machines set the cutting-in time and specific parameters of each injection stage on a touch screen through a manual or calculation method, the manual setting is mainly based on self experience and has relatively large blindness, and the calculated setting is inaccurate due to the influence of a plurality of factors such as the response of a hydraulic system and an electrical system. Particularly the fast shot and boost trigger positions, which have a very critical effect on the quality of the product. Neither of the first two setting methods can ensure product quality.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a forging control method of a metal product for ensuring the quality of a die-cast product.
In order to solve the technical problems, the invention adopts the following technical scheme:
a forging control method of a metal product is characterized in that a pressure sensor is arranged on an injection mechanism of a die casting machine, the pressure sensor detects pressure values of each injection stage and feeds the pressure values back to a central control center of the die casting machine to form a pressure curve graph, and the control method comprises the following steps:
a. slowly injecting, starting an injection oil cylinder, pushing the metal solution in the injection chamber to slowly flow to an ingate, and observing the change of pressure, speed and displacement curves along with displacement;
b. the method comprises the following steps of (1) performing rapid injection, wherein during die casting, the triggering position of the rapid injection is accurately set, so that the quality of a cast product is crucial, and the die casting defects such as air holes, surface water marks and the like can be effectively eliminated, so that when the metal solution in an injection chamber enters an inner gate opening, the pressure of an injection oil cylinder is suddenly increased under the condition of unchanged speed due to the sudden reduction of the sectional area, and when the pressure of a pressure curve graph is suddenly changed, the pressure of the injection oil cylinder is boosted to start a rapid injection stage, so that the metal solution is rapidly injected into a die cavity;
and c, pressurizing and injecting, wherein during die casting, the accurate setting of the triggering position of the pressurizing and injecting is also important for the quality of a cast product, the pressurizing and injecting is triggered too early, the phenomena of flying materials and the like are easily generated, and the pressurizing and triggering is ineffective too late, so that the die casting defects such as shrinkage cavities and the like cannot be effectively eliminated, therefore, according to the comparison between the flow change of the injection chamber and the volume of the die casting die body, when the metal solution enters 1/2 or 1/3 of a slag ladle, the injection oil cylinder further increases the injection pressure to enter the pressurizing and injecting stage, so that the metal solution is continuously injected into the die cavity of the die to fill the casting defects such as shrinkage cavities and the like generated during injection in the step b.
Compared with the prior art, the injection control method provided by the invention has the advantages that the pressure abrupt change point at the end of the slow injection stage is detected through the pressure sensor to obtain the initial point of the fast injection stage, the initial point of the pressurization injection stage is obtained through the comparison of the flow change of the metal solution in the injection chamber and the volume of the cavity of the grinding tool, the judgment is carried out through a machine according to the data change, the flow detection device is combined with the pressure sensor, the trigger point of the conversion of the die-casting stage is accurately grasped, the stage transition stability is improved, and the casting quality of a product is further ensured.
Preferably, the pressure sensor is arranged on the rodless cavity side of the injection oil cylinder and used for detecting the pressure change of the rodless cavity side of the injection oil cylinder when casting liquid enters a sprue gate of the die, and the detection of the quick injection and pressurization injection trigger points is more accurate.
Preferably, the stroke of the injection oil cylinder is recorded in the injection process and fed back to the central control center, and in the step b, when the pressure curve graph changes suddenly, the central control center records the stroke of the injection oil cylinder at the moment as a fast injection trigger point; because every pair of mould only has a pressure sudden change position to the speed of jetting slowly of difference, consequently to same mould, the pressure sudden change of accessible first die-casting detects the trigger point of judging the stage transition, and the stroke to the usable pressure cylinder of jetting of repeated die-casting carries out the judgement to the stage transition trigger point, and it judges more fast, and efficiency is higher.
Preferably, in the slow injection process, the pressure range of the injection oil cylinder is 15-25 bar; in the process of quick injection, the pressure range of the injection oil cylinder is 30-50 bar; in the pressurizing injection process, the pressure of the injection oil cylinder is more than 200 bar.
Preferably, in step b, when the pressure curve diagram has a sudden change, and when the pressure after the sudden change is stably maintained for 0.5 second, the sudden change is valid, the pressurization of the injection cylinder is started to inject the fast injection step, otherwise, the sudden change is invalid, and step b is repeated.
Preferably, the flow rate detection device calculates the time point of the casting liquid entering each position in the slag ladle by detecting the flow rate and the filling time of the metal solution.
Drawings
FIG. 1 is a simplified schematic view of a portion of the die casting mechanism of the present invention;
fig. 2 is a flowchart of a first embodiment of the present invention.
Detailed Description
A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.
Referring to fig. 1 and 2, a forging control method for a metal product, wherein a pressure sensor is arranged on an injection mechanism of a die casting machine, the pressure sensor detects pressure values of each injection stage and feeds the pressure values back to a central control center of the die casting machine to form a pressure curve chart, and the forging control method comprises the following steps:
a. slowly injecting, starting an injection oil cylinder 1, pushing the metal solution in the injection chamber 2 to slowly flow to an ingate 3, and observing the change along with displacement in a pressure, speed and displacement curve chart;
b. during die casting, the trigger position of the quick injection is accurately set, which is crucial to the quality of a cast product and can effectively eliminate die casting defects such as air holes, surface water marks and the like, so that when the metal solution in the injection chamber 2 enters the opening of the ingate 3, the pressure of the injection oil cylinder 1 is suddenly increased under the condition of unchanged speed due to the sudden reduction of the sectional area, and when the pressure of a pressure curve graph is suddenly changed, the pressure of the injection oil cylinder 1 is pressurized to start the quick injection stage, so that the metal solution is quickly injected into the die cavity 4;
specifically, the pressure sensor detects a stable pressure A in the slow injection process, and when the central control monitors that the pressure sensor detects that the pressure of the injection oil cylinder 1 is fed back from the sudden change from the pressure A to the pressure B, the flow rate of the casting liquid is controlled to increase, so that the injection mechanism enters a fast injection stage from a slow injection stage;
and c, pressurizing and injecting, wherein during die casting, the accurate setting of the triggering position of the pressurizing and injecting is also important for the quality of a cast product, the pressurizing and injecting is triggered too early, the phenomena of material flying and the like are easily generated, and the pressurizing and triggering is ineffective too late, so that the die casting defects of shrinkage and the like cannot be effectively eliminated, therefore, according to the comparison between the flow change of the injection chamber 2 and the volume of the die casting die body, when the metal solution enters 1/2 or 1/3 of the slag ladle 5, the injection oil cylinder further increases the injection pressure to enter the pressurizing and injecting stage, so that the metal solution is continuously injected into the die cavity 4 to fill the casting defects of the shrinkage and the like generated during injection in the step b.
Compared with the prior art, the injection control method provided by the invention has the advantages that the pressure abrupt change point at the end of the slow injection stage is detected through the pressure sensor to obtain the initial point of the fast injection stage, the initial point of the pressurization injection stage is obtained through the comparison between the flow change of the metal solution in the injection chamber 2 and the volume of the cavity of the grinding tool, the judgment is carried out through a machine according to the data change, the flow detection device is combined with the pressure sensor, the trigger point of the conversion of the die casting stage is more accurately grasped, the stability of the stage transition is improved, and the casting quality of a product is further ensured.
Preferably, the pressure sensor is arranged on the rodless cavity side of the injection oil cylinder 1 and used for detecting the pressure change of the rodless cavity side of the injection oil cylinder 1 when casting liquid enters the sprue 3 of the die, and the detection on the quick injection and pressurization injection trigger points is more accurate.
As a preferred scheme, recording the stroke of the injection oil cylinder 1 in the injection process and feeding the stroke back to the central control center, wherein in the step b, when the pressure curve graph changes suddenly, the central control center records the stroke of the injection oil cylinder 1 at the moment as a quick injection trigger point; because each pair of mould only has a pressure sudden change position to different slow pressure shooting speed, consequently to same mould, the pressure sudden change of accessible first die-casting detects the trigger point of judging the stage transition, and the stroke of the usable pressure shooting hydro-cylinder 1 of to repeated die-casting carries out the judgement to the stage transition trigger point, and its judgement is faster, and efficiency is higher.
Preferably, in the slow injection process, the pressure range of the injection oil cylinder 1 is 15-25 bar; in the process of quick injection, the pressure range of the injection oil cylinder 1 is 30-50 bar; in the pressurizing injection process, the pressure of the injection oil cylinder 1 is more than 200 bar.
Preferably, in step b, when the pressure curve diagram changes abruptly, and the pressure after the abrupt change is kept stable for 0.5 second, the abrupt change is valid, the injection cylinder 1 is pressurized, the rapid injection step is started, otherwise, the abrupt change is invalid, and step b is repeated.
Preferably, the flow rate detecting device calculates the time point of the casting liquid entering each position in the slag ladle 5 by detecting the flow rate and the filling time of the metal solution.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (5)
1. A forging control method of a metal product is characterized in that: the control method comprises the following steps that a pressure sensor is arranged on an injection mechanism of the die casting machine, the pressure sensor detects pressure values of all injection stages and feeds back the pressure values to a central control center of the die casting machine to form a pressure curve graph, a flow detection device is arranged in an injection chamber of the die casting machine, the flow change of metal solution in the injection chamber of the flow detection device is fed back to the central control center, and the control method comprises the following steps:
a. slowly injecting, starting an injection oil cylinder, pushing the metal solution in the injection chamber to slowly flow to an ingate, and observing the change of pressure, speed and displacement curves along with displacement;
b. the method comprises the following steps of (1) quickly injecting, wherein when a metal solution in an injection chamber enters an inner gate opening, the pressure of an injection oil cylinder is suddenly increased under the condition of unchanged speed due to sudden reduction of the sectional area, and when the pressure of a pressure curve graph is suddenly changed, the injection oil cylinder is pressurized to start a quick injection stage so that the metal solution is quickly injected into a die cavity; recording the stroke of the injection oil cylinder in the injection process and feeding the stroke back to the central control center, wherein when the pressure curve graph changes suddenly, the central control center records the stroke of the injection oil cylinder at the moment as a quick injection trigger point;
and c, pressurizing and injecting, wherein according to the comparison of the flow change of the injection chamber and the volume of the die-casting die body, when the metal solution enters 1/2 or 1/3 of the slag ladle, the injection oil cylinder further increases the injection pressure to enter a pressurizing injection stage, so that the metal solution is continuously injected into the die cavity.
2. The forging control method of a metal product according to claim 1, characterized in that: the pressure sensor is arranged on the rodless cavity side of the injection oil cylinder and used for detecting the pressure change of the rodless cavity side of the injection oil cylinder when casting liquid enters a sprue gate of the die.
3. The forging control method of a metal product according to claim 1, characterized in that: in the slow injection process, the pressure range of the injection oil cylinder is 15-25 bar; in the process of quick injection, the pressure range of the injection oil cylinder is 30-50 bar; in the pressurizing injection process, the pressure of the injection oil cylinder is more than 200 bar.
4. The forging control method of a metal product according to claim 1, characterized in that: in the step b, when the pressure curve graph has a sudden change, the sudden change is effective when the pressure after the sudden change is stably kept for 0.5 second, the pressure boost of the injection oil cylinder is started to inject the fast injection step, otherwise, the sudden change is ineffective, and the step b is repeated.
5. The forging control method of a metal product according to any one of claims 1 to 4, characterized in that: the flow detection device calculates the time point of the casting liquid entering each position in the slag ladle by detecting the flow speed and the filling time of the metal solution.
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| CN201911011911.3A CN110548854B (en) | 2019-10-23 | 2019-10-23 | Forging control method for metal product |
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| CN201911011911.3A CN110548854B (en) | 2019-10-23 | 2019-10-23 | Forging control method for metal product |
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| CN112792312B (en) * | 2020-12-25 | 2022-02-11 | 重庆百吉四兴压铸有限公司 | High-pressure casting method by using speed-cut pressure injection |
| CN114309529A (en) * | 2022-01-19 | 2022-04-12 | 韶关市威劲星光机械科技有限公司 | Novel vertical cold chamber die casting machine |
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