CN215697918U - Demolding tool for precision cast rod steel pipe - Google Patents
Demolding tool for precision cast rod steel pipe Download PDFInfo
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- CN215697918U CN215697918U CN202121551592.8U CN202121551592U CN215697918U CN 215697918 U CN215697918 U CN 215697918U CN 202121551592 U CN202121551592 U CN 202121551592U CN 215697918 U CN215697918 U CN 215697918U
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Abstract
The utility model provides a demolding tool for a precision cast rod steel tube, which comprises: the demolding steel pipe is vertically arranged, the demolding steel pipe is arranged on the cylinder jacking device, the demolding steel pipe is of a hollow tubular structure, and the precision casting rod is arranged in the demolding steel pipe; the induction coil is sleeved on the periphery of the demoulding steel pipe, the induction coil linearly moves up and down along the length extending direction of the demoulding steel pipe, and the induction coil is electrically connected with the power supply. The high-frequency coil is convenient to install and move by adopting vertical demoulding instead of the traditional horizontal demoulding; the high-frequency heating coil can move up and down, and can heat the whole length direction by using a small number of turns; the central rapid heating is implemented on the parts with serious adhesion, the demoulding effect can be realized by using the minimum energy, and the cost for damaging the steel pipe and damaging the internal precision casting rod is saved.
Description
Technical Field
The utility model relates to the technical field of high-temperature precision casting bar processing, in particular to a precision casting bar steel tube demoulding tool.
Background
The method comprises the steps of heating, melting and homogenizing a metal-based material, casting the metal-based material into a steel pipe by using a certain flow guide device to form a precision casting rod, and finally cooling to room temperature, demoulding to separate the steel pipe from the precision casting rod inside, thereby obtaining the required precision casting rod.
In the process of pouring the precision casting rod, molten metal generally flows into the steel pipe through a refractory material hole (or a plurality of shunting holes) which is far smaller than the inner diameter of the steel pipe in a top casting mode, and the bottom of the steel pipe is firstly contacted with the molten metal. The bottom of the steel pipe is usually a detachable metal bottom plug structure, and the molten metal begins to solidify from the bottom. Along with the difference of molten steel casting speed, the subsequent solidification heat conduction mode is diversified, and the solidification mode is more complicated: there is both coagulation from the bottom up and coagulation from the outside and inside. The influence of expansion with heat and contraction with cold finally forms a tiny gap between the precision casting rod and the die steel pipe made of steel material, so that the precision casting rod can be smoothly separated from the die pipe.
However, in practical situations, many factors influence the smooth degree of demolding: the wall thickness of the die steel pipe, the surface quality of the die steel pipe, the temperature of the molten metal, the flowing mode and direction of the molten metal, the thermal expansion coefficient of the molten metal and the like. For molten metal with a melting point of 900-1600 ℃, dispersion and splashing can occur in the process of pouring from high to low of the small holes of the refractory material into the steel pipe. If the small holes of the refractory material and the steel pipe holes are not concentric or the steel pipe and the ground have larger inclination angle, the steel pipe is very easy to be locally overheated or even scoured by high-temperature molten metal, so that the pipe sticking phenomenon is caused.
Factors that affect demolding also include: some precision casting rod materials have small thermal expansion coefficient, and the volume shrinkage is not large from the melting point temperature to the vicinity of the room temperature; or because the material is brittle, the material cracks due to thermal stress in the cooling process, and the volume of the precision casting pipe is increased invisibly. All of the above problems are easy to cause that the subsequent demoulding can not be smoothly released, even the demoulding cylinder jacking machine can not be released by adopting the pressure of more than 100 tons (the pressure is increased again, the deformation of the mould steel pipe is easy to cause, and the potential safety hazard exists).
It is common practice in the industry to flame heat the mold steel tube to cut it away, or to remove the mold steel tube by other methods that damage the steel mold. Therefore, the waste of the die steel pipe is caused, the surface quality of the precision casting rod is influenced, the workload is greatly increased, and the working efficiency is influenced.
Utility model patent CN 211161545U provides convenient to use's superalloy drawing of patterns frock, possesses the advantage that the location is accurate and the staff of being convenient for uses, solves the inaccurate and staff's of being not convenient for problem that uses of location. However, the situation that the mold cannot be removed due to too large mold removal resistance is not involved, and in engineering practice, the situation that the mold cannot be removed normally due to the various reasons is quite large, so that a large amount of workload is increased, and resources are wasted.
SUMMERY OF THE UTILITY MODEL
Aiming at the problem that the conventional demoulding cannot be realized through a cylinder jacking machine due to the factors of pipe sticking, pipe clamping and the like of the precision casting rod, the utility model provides an effective and rapid demoulding tool structure, namely, a vertical cylinder jacking machine is designed, a steel pipe which cannot be demoulded is rapidly heated through high-frequency induction heating, and then the demoulding is rapidly carried out. For the serious adhesion and the demolding incapability, the adhesion position is determined, and the local rapid heating of the adhesion position is carried out by high-frequency induction to a higher temperature, so that the strength of the adhesion part is softened, and the demolding effect is achieved.
In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a smart cast rod steel pipe drawing of patterns frock, includes:
the demolding steel pipe is vertically arranged, the demolding steel pipe is arranged on the cylinder jacking device, the demolding steel pipe is of a hollow tubular structure, and the precision casting rod is arranged in the demolding steel pipe;
the induction coil is sleeved on the periphery of the demoulding steel pipe, the induction coil linearly moves up and down along the length extending direction of the demoulding steel pipe, and the induction coil is electrically connected with the power supply.
As an improvement of the utility model, the cylinder jacking device comprises an upper pressure head and a lower support, the lower end of the demoulding steel pipe is abutted against the upper end surface of the lower support, and the upper pressure head is positioned right above the demoulding steel pipe.
As an improvement of the utility model, the induction coil is electrically connected with the industrial three-phase power, the input voltage of the industrial three-phase power is 340V-420V, the oscillating current is 0-400A, and the output oscillating frequency is 10-30 KHZ.
As an improvement of the utility model, the distance between the inner diameter of the induction coil and the outer wall of the demoulding steel pipe is uniform, and the number of turns of the induction coil is 2-10.
As an improvement of the utility model, the induction coil moves up and down linearly through the electric fast lifting platform, and the moving speed is 0 m/s-3 m/s.
As an improvement of the utility model, an infrared temperature measuring device is arranged near the demoulding steel pipe.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic diagram of the operation of the present invention.
The components in the figure are:
1. the device comprises a demoulding steel pipe, 2, a precision casting rod, 3, an induction coil, 4, an upper pressure head, 5, a lower support, 6, an electric rapid lifting platform, and 7, an infrared temperature measuring device.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Referring to all the drawings, a demolding tool for a precision cast rod steel tube comprises:
the demolding steel pipe 1 is vertically arranged, the demolding steel pipe 1 is arranged on a cylinder jacking device, the demolding steel pipe 1 is of a hollow tubular structure, and a precision casting rod 2 is arranged in the demolding steel pipe 1;
and the induction coil 3 is sleeved on the periphery of the demoulding steel pipe 1, the induction coil 3 is linearly moved up and down along the length extending direction of the demoulding steel pipe 1, and the induction coil 3 is electrically connected with a power supply.
As an embodiment of the present invention, the cylinder jacking device includes an upper ram 4 and a lower support 5, the lower end of the demolded steel tube 1 abuts against the upper end surface of the lower support 5, and the upper ram 4 is located right above the demolded steel tube 1.
As an embodiment of the utility model, the induction coil 3 is electrically connected with industrial three-phase power, the input voltage of the industrial three-phase power is 340V-420V, the oscillating current is 0-400A, and the output oscillating frequency is 10-30 KHZ.
As an embodiment of the utility model, the distance between the inner diameter of the induction coil 3 and the outer wall of the demoulding steel pipe 1 is uniform, and the number of turns of the induction coil 3 is 2-10.
As an embodiment of the utility model, the induction coil 3 moves up and down linearly through the electric fast lifting platform 6, and the moving speed is 0 m/s-3 m/s.
As an embodiment of the utility model, an infrared temperature measuring device 7 is arranged near the demoulding steel pipe 1.
The working principle of the technical scheme is as follows:
adopt vertical top cylinder structure, top cylinder direction is top-down, and the drawing of patterns steel pipe axis is placed along top cylinder direction, and outside cover high frequency induction coil, induction coil can reciprocate along top cylinder direction to reciprocate fast relatively to the mould pipe, heat mould steel pipe rapid heating to about 500 ℃, the steel pipe thermal expansion internal diameter grow, and the while heat has not yet been transmitted the precision casting stick, then carries out top-down's top cylinder operation. To seriously erodeing the steel pipe and cause the adhesion, through knocking echo feedback, judge the concrete position of adhesion, remove induction coil this serious adhesion position again, carry out rapid heating to higher temperature to this position alone, thereby soften bonding position intensity and realize top jar machine drawing of patterns operation. The high-frequency induction coil adopts industrial three-phase power, the input voltage is 340V-420V, the oscillation current is 0-400A, the output oscillation frequency is 10-30KHZ, and the distance between the inner diameter of the high-frequency coil and the outer wall of the steel die is uniform and is 10-40 mm; the number of turns of the coil is between 2 and 10 turns; the induction coil moves up and down relative to the demoulding steel pipe, the mould steel pipe is rapidly heated to about 500 ℃, an induction coil auxiliary box is supported by an electric rapid lifting platform, the moving speed is 0-3 m/s, an infrared temperature measuring device is adopted for temperature measurement, the temperatures of an upper section, a middle section and a lower section are ensured to be 350-650 ℃, and the temperature difference is less than 50 ℃; judging the specific adhesion part by knocking echo feedback, namely knocking the outer wall of the steel mould every 20mm by a small metal hammer to confirm the sound change, and marking the part which is not crisp due to the echo and is the serious adhesion part; the induction coil is used for rapidly heating the position to a higher temperature which is about 3/5 of the melting point according to the size of the melting point of the precision casting rod material.
In actual production, the specific operation process and production results are shown in the following two examples.
Example 1
Selecting a 45# steel precision steel pipe with the inner diameter of phi 80mm, the outer diameter of phi 108mm and the length of 580mm as a steel die, and producing CuTi intermediate alloy by vacuum induction melting, wherein the CuTi intermediate alloy comprises the following components in percentage by weight: 50 (wt.%), its melting point is 960 ℃. The casting temperature is 1020 ℃, the casting quantity is 95, and the CuTi alloy with the composition ratio has low thermal expansion coefficient and forms intermetallic compounds, so the alloy is hard and brittle. During cooling and demolding, cracking is easy to occur to influence relative movement during demolding, so that 20 of 95 demolding machines cannot be subjected to normal cylinder ejection demolding (100-ton cylinder ejection machines), and finally, all demolding machines are smoothly obtained through the following steps:
and 2, introducing cooling water into the high-frequency coil, wherein the cooling water pressure is 0.2 MPa.
And 3, switching on a power supply, supplying power to 15kw, heating the oscillation current to be 60A, and outputting the oscillation frequency to be 18 KHZ.
and 5, measuring the temperature of the die steel pipe by using a handheld infrared thermometer until the upper temperature, the middle temperature and the lower temperature are respectively 530 ℃, 550 ℃ and 540 ℃, and stopping heating and moving of the high-frequency coil. According to a conventional demolding and cylinder ejecting process, slowly pressing an upper pressure head of a cylinder ejecting machine downwards, and ejecting an inner precision casting rod;
after the process, the 20 steel pipes cannot be demoulded normally by jacking the cylinder, the single heating time is 1 minute, and finally the demoulding is completed smoothly, and the inner wall of the steel pipe of the mould is not scratched seriously and has no difference from the conventional demoulding.
Example 2
The steel die selects a 45# precision steel tube with the inner diameter of 60mm and the outer diameter of 88mm and the length of 550mm to produce the K465 nickel-based high-temperature alloy, and the specific component ranges and the actual measurement values are as shown in the following table.
The melting point calculated by the JmatPro simulation was 1357 ℃ and the casting temperature was 1500 ℃. The product has larger expansion coefficient, larger volume contraction from the molten state to the room temperature, naturally formed cooling clearance between the formed precision casting rod and the die steel pipe, and convenient demoulding. But because the melting point of the component is higher, the inner diameter of the die steel pipe is smaller, so that splashing and scouring on the inner wall of the steel pipe are easily caused to generate adhesion. In this example, a total of 208 shots were poured, 150 shots were naturally removed, and 30 shots were removed by a 100-ton cylinder head machine.
In addition, 28 pieces of the mould can not be demoulded under the action of a 100-ton cylinder jacking machine, wherein three pieces of the mould are seriously adhered, so that the mould can be completely and smoothly demoulded by adopting the method disclosed by the utility model through the following steps:
and 2, introducing cooling water into the high-frequency coil, wherein the cooling water pressure is 0.2 MPa.
And 3, switching on a power supply, supplying power to 13kw, heating the oscillation current to 55A, and outputting the oscillation frequency to 20 KHZ.
and 5, measuring the temperature of the die steel pipe by using a handheld infrared thermometer until the upper temperature, the middle temperature and the lower temperature are respectively 540 ℃, 560 ℃ and 540 ℃, and stopping heating and moving the high-frequency coil. According to the conventional process, slowly pressing an upper pressure head of a cylinder jacking machine downwards to push out an inner precision casting rod; by adopting the process, 25 pieces of the mixture are demolded;
and 6, knocking the outer wall of the pipe to obtain a part with a stuffy echo, namely a serious adhesion part. Positioning a high-frequency induction coil at the position, supplying power to 13kw, heating oscillation current to 55A, outputting oscillation frequency to 20KHZ, lasting for 20 seconds, reddening at the position, stopping heating the coil when the temperature reaches 810 ℃, and quickly performing cylinder jacking operation, thereby smoothly demoulding the three seriously adhered finish cast rods.
After the process, the 28 steel pipes which cannot be ejected normally are ejected smoothly finally through two corresponding operations, and except for three steel pipes which are seriously adhered, the inner walls of the steel pipes of other dies are not seriously scratched, and the process is not different from the conventional demolding.
The beneficial effects of the above technical scheme are that:
1. the high-frequency coil is convenient to install and move by adopting vertical demoulding instead of the traditional horizontal demoulding;
2. the inner hole can be enlarged by the heating expansion of the steel pipe through the rapid heating of the high-frequency heating coil and the concentration of the heating generated by the eddy current effect on the steel pipe, and the inner precision casting rod mainly bears conduction heat instead of induction heat, so that the temperature rise is much smaller, and the original size is basically kept unchanged;
3, the high-frequency heating coil can move up and down, and can heat the whole length direction by using a small number of turns;
4, to serious adhesion position, implement concentrated rapid heating, can use minimum energy, realize the effect of drawing of patterns, saved the cost of destroying the steel pipe and injuring inside precision casting stick.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the utility model.
Claims (6)
1. The utility model provides a smart excellent steel pipe drawing of patterns frock of casting which characterized in that includes:
the demolding steel pipe (1) is vertically arranged, the demolding steel pipe (1) is arranged on the cylinder jacking device, the demolding steel pipe (1) is of a hollow tubular structure, and the precision casting rod (2) is arranged in the demolding steel pipe (1);
the induction coil (3) is sleeved on the periphery of the demoulding steel pipe (1), the induction coil (3) is arranged along the length extending direction of the demoulding steel pipe (1) and linearly moves up and down, and the induction coil (3) is electrically connected with a power supply.
2. The precision casting rod steel tube demoulding tool according to claim 1, wherein the top cylinder device comprises an upper pressure head (4) and a lower support (5), the lower end of the demoulding steel tube (1) abuts against the upper end face of the lower support (5), and the upper pressure head (4) is located right above the demoulding steel tube (1).
3. The demolding tool for the precision cast rod steel tube as claimed in claim 1, wherein the induction coil (3) is electrically connected with industrial three-phase power, the input voltage of the industrial three-phase power is 340V-420V, the oscillation current is 0-400A, and the output oscillation frequency is 10-30 KHZ.
4. The demolding tool for the precision cast steel bar pipe as claimed in claim 1, wherein the distance between the inner diameter of the induction coil (3) and the outer wall of the demolding steel pipe (1) is uniform, and the number of turns of the induction coil (3) is 2-10.
5. The demolding tool for the precision cast rod steel tube as claimed in claim 1, wherein the induction coil (3) moves up and down linearly through the electric fast lifting platform (6) at a speed of 0 m/s-3 m/s.
6. The precision casting rod steel tube demoulding tool according to claim 1, wherein an infrared temperature measuring device (7) is arranged near the demoulding steel tube (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121551592.8U CN215697918U (en) | 2021-07-08 | 2021-07-08 | Demolding tool for precision cast rod steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121551592.8U CN215697918U (en) | 2021-07-08 | 2021-07-08 | Demolding tool for precision cast rod steel pipe |
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| Publication Number | Publication Date |
|---|---|
| CN215697918U true CN215697918U (en) | 2022-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121551592.8U Active CN215697918U (en) | 2021-07-08 | 2021-07-08 | Demolding tool for precision cast rod steel pipe |
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| Country | Link |
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| CN (1) | CN215697918U (en) |
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2021
- 2021-07-08 CN CN202121551592.8U patent/CN215697918U/en active Active
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