CN114588841B - Hexahedral top press and automatic temperature control adjustment method thereof - Google Patents
Hexahedral top press and automatic temperature control adjustment method thereof Download PDFInfo
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- CN114588841B CN114588841B CN202210346043.XA CN202210346043A CN114588841B CN 114588841 B CN114588841 B CN 114588841B CN 202210346043 A CN202210346043 A CN 202210346043A CN 114588841 B CN114588841 B CN 114588841B
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000010438 heat treatment Methods 0.000 claims abstract description 119
- 238000005245 sintering Methods 0.000 claims abstract description 55
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 26
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 26
- 239000011812 mixed powder Substances 0.000 claims abstract description 10
- CLOMYZFHNHFSIQ-UHFFFAOYSA-N clonixin Chemical compound CC1=C(Cl)C=CC=C1NC1=NC=CC=C1C(O)=O CLOMYZFHNHFSIQ-UHFFFAOYSA-N 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 5
- 238000002474 experimental method Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052903 pyrophyllite Inorganic materials 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/06—Processes using ultra-high pressure, e.g. for the formation of diamonds; Apparatus therefor, e.g. moulds or dies
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention relates to a hexahedral press and a temperature control automatic adjustment method thereof, wherein a standard heating body and standard power are determined in a pre-calibration mode, so that mixed powder in a synthetic block reaches a better sintering temperature when the standard heating body outputs the standard power through a heating system, and the better sintering temperature can be judged through the product state after sintering is finished. In the synthesis process, the resistance of the current heating body is collected and compared with the resistance of the standard heating body, and the output power of the heating system is adjusted on the basis of the standard power according to the comparison result. The invention avoids the problem that the heating body has different resistances due to assembly difference, and the output of the heating system of the hexahedral press needs to be manually adjusted to avoid the overhigh or overlow sintering temperature, thereby improving the automation degree of synthesis and the sintering synthesis effect.
Description
Technical Field
The invention relates to a hexahedral top press and a temperature control automatic adjustment method thereof, belongs to the technical field of hard material top press sintering synthesis, and particularly relates to automatic temperature control in the sintering synthesis process.
Background
The hexahedral top press is a device commonly used for synthesizing diamond in China, wherein most of the device is a hinge Liang Liumian top press, and the hexahedral top press comprises five parts of a host machine, a booster, a hydraulic control system, an electric appliance control system and a heating system. The pressing cavity of the press consists of six hard alloy top hammers, the pressure of the synthetic block is generated by the extrusion of the top hammers, and the high temperature is generated by the heat generation of the carbon tubes in the synthetic block through the current introduced by the upper top hammer and the lower top hammer.
The heating member in the pyrophyllite synthetic block is assembled by assembly parts such as steel ring, gasket, carbon sheet, carbon tube, and every assembly part has differences in physical dimension, quality, physical property and the like, and the difference of heat conduction performance commonly exists in the synthetic block after the assembly, and under the condition that the output power of a heating system of a hexahedral press is constant, the difference of heat conducted to mixed powder after the heating member heats can be caused, the difference of sintering temperature exists, and the sintering quality and consistency are affected.
In the prior art, a manual adjustment mode is adopted for controlling a heating system, when a product starts to sinter, a certain power (corresponding current is output by the heating system) is given manually through experience, whether the sintering temperature of the product is proper or not is judged through the product state after sand blasting after sintering, when the sintering temperature of the product is too high or too low, the power is increased or reduced manually to sinter the next block, the adjustment amplitude can only be judged according to the manual experience after the sintering is finished according to the product state after sand blasting, and the process is repeated for several times to find a proper temperature point, namely, the proper power output by the heating system is found.
However, due to the assembly difference of the assembly parts, even if the proper output power of the heating system is found, certain deviation of the sintering temperature of the product can be caused due to the difference of the heat conduction of the synthetic blocks, the sintering quality of the product is affected, and the consistency of the product is poor.
Disclosure of Invention
The invention aims to provide a hexahedral press and a temperature control automatic adjustment method thereof, which are used for solving the problems of low intelligent degree of temperature control of the hexahedral press, difference of sintering temperatures, loss of a top hammer in the sintering synthesis process and production safety.
In order to achieve the above object, the present invention provides a method comprising:
the hexahedral top press comprises a heating system, wherein the current output by the heating system is used for being input into a heating body in a synthetic block through a top hammer, and the heating body heats to realize sintering; the controller in the heating system executes instructions to realize the following automatic adjustment method for the temperature control of the hexahedral press:
1) Collecting the current resistance of a heating body of the currently installed synthetic block, and comparing the current resistance with the standard sample resistance of a standard heating body;
2) If the current resistance is larger than the standard resistance, raising the heating output power of the heating system on the basis of the standard power according to the set standard;
if the current resistance is smaller than the standard resistance, reducing the heating output power of the heating system on the basis of standard power according to the set standard;
3) In the sintering stage of the synthesis process, the output is carried out according to the modified heating output power,
and (5) completing sintering.
And when the difference value between the current resistor and the standard sample resistor is larger than a set value, outputting an alarm signal to stop the synthesis process.
Through pre-calibration, when the standard heating body outputs standard power, the mixed powder in the synthetic block reaches the preset sintering temperature.
The sintering process of the hexahedral press is completely and automatically controlled by a program, the output power of the heating system does not need to be manually and repeatedly debugged, the automation degree in the synthesis process is improved, and the cost is reduced. Meanwhile, the sintering is controlled according to the resistance change of the heating body, so that the sintering is more scientific and accurate, and the consistency of the synthesis of the superhard material is improved.
When the difference between the resistor and the standard sample is large, the synthetic block is judged to be possibly an unqualified product, the heating body is possibly problematic, the output heating power of the heating body is difficult to successfully sinter and synthesize, even potential safety hazards exist, a shutdown signal is sent when the difference exceeds a set value, the synthesis is not performed, the loss of the top hammer is reduced, and the production safety is ensured.
Further, the setting criteria include:
wherein DeltaR is the difference value between the current resistance and the standard resistance; Δp is the amount of change that increases or decreases based on the standard power; A. b is a preset constant.
And determining the standard sample resistance of the standard heating body and the output power of the heating system which can ensure that the sintered and synthesized product achieves the optimal sintering effect in a pre-calibrated mode, wherein the temperature at which the product achieves the optimal sintering effect is the preset sintering temperature (heat). On the premise of ensuring that the preset sintering temperature or heat is unchanged, an empirical formula of the relation between the resistance change quantity delta R and the output power change quantity delta P is established, and the empirical formula is written into a control program of a heating system, so that the optimal output power can be automatically and accurately output, and the preset heat can be input into the mixed powder or the mixed powder can reach the preset temperature during each sintering. Therefore, the sintering temperature control method is better and more accurate, and can achieve better sintering effect.
Further, the constant A has a value ranging from 0.1 to 2.
Further, the constant B has a value ranging from 0.02 to 2.
According to the data of experiment or long-term synthesis sintering accumulation, the parameter numerical value range which can achieve more accurate sintering temperature control for various hexahedral top presses is obtained. The sintering temperature control effect is improved.
The invention discloses a temperature control automatic adjustment method of a hexahedral top press, which comprises the following steps:
1) The heating system of the hexahedral press collects the current resistance of the heating body of the currently installed synthetic block and compares the current resistance with the standard sample resistance of the standard heating body; the current output by the heating system is used for being input into a heating body in the synthetic block through the top hammer, so that the heating body heats and realizes sintering;
2) If the current resistance is larger than the standard resistance, raising the heating output power of the heating system on the basis of the standard power according to the set standard;
if the current resistance is smaller than the standard resistance, reducing the heating output power of the heating system on the basis of standard power according to the set standard;
3) And in the sintering stage in the synthesis process, the heating system outputs according to the modified heating output power to finish sintering.
And when the difference value between the current resistor and the standard sample resistor is larger than a set value, outputting an alarm signal to stop the synthesis process.
When the standard heating body outputs standard power, the mixed powder in the synthetic block reaches the preset sintering temperature.
Further, the setting criteria include:
wherein DeltaR is the difference value between the current resistance and the standard resistance; Δp is the amount of change that increases or decreases based on the standard power; A. b is a preset constant.
Further, the constant A has a value ranging from 0.1 to 2.
Further, the constant B has a value ranging from 0.02 to 2.
The method of the invention has the following beneficial effects:
(1) The whole process is automatically controlled by equipment, so that manual control is reduced, and the degree of automation is greatly improved;
(2) The automatic control is accurate and effective, the artificial control is avoided, the sintering temperature deviation of the product is large, and the yield and quality stability of the product are improved;
(3) The problems of missing, multiple-assembly, wrong assembly and the like during assembling the product can be identified in advance through larger resistance deviation, and excessive hammer consumption is avoided.
Drawings
FIG. 1 is a flow chart of a method for automatically adjusting the temperature control of a hexahedral press according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Hexahedral press example:
the hexahedral top press comprises a heating system, wherein the output power (current) of the heating system heats through a heating body with a certain resistance value in a pyrophyllite synthetic block, so that mixed powder is heated in the extrusion process.
Heat Q required for synthesis of diamond or other superhard material Is required to Is constant, so the heating system heats with constant power (output power P). Q is due to loss of heat during heating Is required to ＝αQ Total (S) ，Q Total (S) The total heating value of the hexahedral press is generated by the output power P of the heating system, and comprises the following components:
Q is required to ＝αQ Total (S) ＝αPT＝αI 2 RT
Wherein T is heating time of the heating system, I is constant current output under working voltage of the heating system, R is resistance of the heating body, and alpha is heat transfer efficiency of the hexahedral press.
According to experience summarized by historical sintering data, the heat transfer efficiency alpha of the hexahedral press is inversely proportional to the heating body resistance, the heating body resistance is increased, the heat transfer efficiency is reduced, and when the heating body resistance is reduced, the heat transfer efficiency is increased. Thus, an empirical formula is obtainedA is a constant reflecting the relation between the resistance and the heat transfer efficiency, and can be obtained through experiments or historical data.
Determining a standard heating body as a standard sample according to multiple tests or historical sintering synthesis process, and determining the resistance R of the standard sample Label (C) And the output power of the heating system of the hexahedral press when the standard sample reaches the optimal sintering temperature is used as the calibration power P Label (C) 。
Q at optimum sintering temperature Is required to The method comprises the following steps:
the finishing method can obtain:
wherein,b is the actual physical meaning of the heating system heating power which is actually applied to the mixed powder after heat dissipation. According to experiments, A and B have different values according to different hexahedral press products, and according to experiments, A has a best embodiment range of 0.1-2 mΩ and B has a best embodiment range of 0.02-2 KW.
In the actual synthesis process, the heating body resistance actually used is detected, and the output power of the heating system is determined according to the following relation:
wherein DeltaP is the power P and the calibration power P Label (C) Compared with the variation of the actual output power of the heating system, namely the variation of the output power of the synthetic heating system compared with the calibration power; ΔR is the resistance R with the standard sample Label (C) In contrast, the variation of the heating element resistance detected in the actual synthesis process, i.e., the difference between the heating element resistance actually used and the reference resistance.
The standard parameters, the relationships and the A, B values are written into a heating system program, and the automatic adjustment method for the temperature control of the hexahedral press according to the invention is implemented according to the following logic steps as shown in fig. 1.
Every time the synthesis, the hexahedral press heating system detects the heating body resistance of the currently installed synthesis block. When the resistance of the heating body actually used increases, ΔR is positive according toThe delta P is obtained to be positive and should be at the rated power P Label (C) Increasing heating system power to P based on (a) Label (C) The more the heating body resistance is actually used, the more the reference resistance is exceeded, and the power of the heating system is increasedThe more the addition; when the resistance of the heating body in actual use is lowered, ΔR is negative according to +.>The delta P is negative and should be at the nominal power P Label (C) Reducing heating system power to P on a basis of (2) Label (C) The more the heating body resistance is actually used, the more the heating system power increases, compared to the reference resistance, the +Δp (Δp is negative).
Solidifying the relation into a heating system controller, and obtaining the actual output power P=P according to the delta P and the calibration power Label (C) And (5) outputting corresponding heating power P by the heating system to finish sintering in the current synthesis process. The process is automatically realized by a program without manual intervention. When the currently used heating body resistor is compared with the standard sample resistor, the resistance change, namely delta R, exceeds the set limit, the synthesis of the hexahedral press is stopped by alarming, and the assembly problem is required to be manually intervened to prevent safety accidents.
After each work order is finished, the adjustment range of the heating body in the book Zhang Gongshan compared with the standard heating body resistance can be automatically summarized and stored, and the subsequent data analysis is convenient.
According to the invention, the heating body resistor is collected in each sintering process and compared with the standard sample resistor, when the resistor is found to be increased or decreased, the output power of the heating system is increased or decreased according to the preset relation, the uniformity of the sintering temperature is ensured, the problems of large workload and complex operation caused by multiple experiments according to experience manually in the prior art are solved, and the problem of large sintering temperature difference caused by an assembly process is also avoided.
Method embodiment:
the method steps of the automatic adjustment method for temperature control of the hexahedral press of the present invention are sufficiently clear as described in the embodiment of the hexahedral press, and will not be described herein.
Claims (6)
1. The hexahedral top press comprises a heating system, wherein the current output by the heating system is used for being input into a heating body in the synthetic block through a top hammer, and the heating body heats to realize sintering; the automatic temperature control adjustment method for the hexahedral press is characterized in that a controller in a heating system executes instructions to realize the following automatic temperature control adjustment method for the hexahedral press:
1) Collecting the current resistance of a heating body of the currently installed synthetic block, and comparing the current resistance with the standard sample resistance of a standard heating body;
2) If the current resistance is larger than the standard resistance, raising the heating output power of the heating system on the basis of the standard power according to the set standard; the setting criteria include:
wherein DeltaR is the difference value between the current resistance and the standard resistance; Δp is the amount of change that increases or decreases based on the standard power; A. b is a preset constant;
if the current resistance is smaller than the standard resistance, reducing the heating output power of the heating system on the basis of standard power according to the set standard;
3) In the sintering stage in the synthesis process, outputting according to the modified heating output power to finish sintering;
when the difference value between the current resistor and the standard sample resistor is larger than a set value, outputting an alarm signal to stop the synthesis process;
through pre-calibration, when the standard heating body outputs standard power, the mixed powder in the synthetic block reaches the preset sintering temperature.
2. The hexahedral press according to claim 1, wherein the constant a has a value ranging between 0.1 and 2.
3. The cubic press according to claim 2, wherein the constant B has a value ranging between 0.02 and 2.
4. The automatic temperature control adjustment method for the hexahedral top press is characterized by comprising the following steps of:
1) The heating system of the hexahedral press collects the current resistance of the heating body of the currently installed synthetic block and compares the current resistance with the standard sample resistance of the standard heating body; the current output by the heating system is used for being input into a heating body in the synthetic block through the top hammer, so that the heating body heats and realizes sintering;
2) If the current resistance is larger than the standard resistance, raising the heating output power of the heating system on the basis of the standard power according to the set standard;
if the current resistance is smaller than the standard resistance, reducing the heating output power of the heating system on the basis of standard power according to the set standard;
the setting criteria include:
wherein DeltaR is the difference value between the current resistance and the standard resistance; Δp is the amount of change that increases or decreases based on the standard power; A. b is a preset constant;
3) In the sintering stage in the synthesis process, the heating system outputs according to the modified heating output power to finish sintering;
when the difference value between the current resistor and the standard sample resistor is larger than a set value, outputting an alarm signal to stop the synthesis process;
through pre-calibration, when the standard heating body outputs standard power, the mixed powder in the synthetic block reaches the preset sintering temperature.
5. The automatic temperature control adjustment method of a hexahedral press according to claim 4, wherein the constant a has a value ranging from 0.1 to 2.
6. The automatic temperature control adjustment method of a cubic press according to claim 5, wherein the constant B has a value ranging from 0.02 to 2.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2032617C1 (en) * | 1989-07-04 | 1995-04-10 | Институт сверхтвердых материалов им.В.Н.Бакуля АН Украины | Method for monitoring and control of diamond synthesizing process |
| CN102350268A (en) * | 2011-07-01 | 2012-02-15 | 中南钻石股份有限公司 | Industrial diamond synthesizing device and synthetic method |
| CN102436278A (en) * | 2011-08-24 | 2012-05-02 | 张克勇 | Electric heater and control device thereof |
| CN107921390A (en) * | 2015-07-30 | 2018-04-17 | 第六元素（英国）有限公司 | Encapsulated member component and its application method for super-pressure press |
| CN111912125A (en) * | 2020-09-12 | 2020-11-10 | 畅和智能家居(嘉兴)有限公司 | Fluid heater and control method thereof |
| CN112040577A (en) * | 2020-09-01 | 2020-12-04 | 北京阿尔玛斯科技有限公司 | Substance synthesis control method and device and electronic equipment |
-
2022
- 2022-03-31 CN CN202210346043.XA patent/CN114588841B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2032617C1 (en) * | 1989-07-04 | 1995-04-10 | Институт сверхтвердых материалов им.В.Н.Бакуля АН Украины | Method for monitoring and control of diamond synthesizing process |
| CN102350268A (en) * | 2011-07-01 | 2012-02-15 | 中南钻石股份有限公司 | Industrial diamond synthesizing device and synthetic method |
| CN102436278A (en) * | 2011-08-24 | 2012-05-02 | 张克勇 | Electric heater and control device thereof |
| CN107921390A (en) * | 2015-07-30 | 2018-04-17 | 第六元素（英国）有限公司 | Encapsulated member component and its application method for super-pressure press |
| CN112040577A (en) * | 2020-09-01 | 2020-12-04 | 北京阿尔玛斯科技有限公司 | Substance synthesis control method and device and electronic equipment |
| CN111912125A (en) * | 2020-09-12 | 2020-11-10 | 畅和智能家居(嘉兴)有限公司 | Fluid heater and control method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 人造金刚石合成工艺中应用模糊控制的探讨;鄂洪儒等;《珠宝科技》;第15卷(第2期);第5-8页 * |
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