CN115138818B - Slide rail resilience fixing device for centrifugal casting equipment - Google Patents

Abstract

The invention belongs to the field of centrifugal casting equipment, and particularly discloses a slide rail rebound fixing device for centrifugal casting equipment, which comprises a movable slide block, a spring and a fixed slide rail, wherein the fixed slide rail is fixed on a mould shell pressing plate clamp, the slide block is connected with the slide rail through the spring, a centrifugal turntable is provided with a positioning hole matched with the movable slide rail, when the equipment works centrifugally, the movable slide block slides outwards under the action of centrifugal force and enters the positioning hole on the centrifugal turntable to fix a mould shell, the centrifugal force borne by the movable slide block is far greater than the tensile force of the spring, and the sliding distance of the movable slide block is positioned through a stop boss at the bottom of the movable slide block, so that the spring is prevented from generating plastic deformation failure; the movable sliding block loses the centrifugal force and is pulled back by the spring when the centrifugation stops, the mechanism realizes the centrifugal fixation of the formwork and simultaneously facilitates the clamping and the dismounting of the formwork and the formwork pressing frame, the fixing is firm during the work, the structure is simple, and the use is convenient.

Description

A sliding rail rebound fixing device for centrifugal casting equipment

technical field

The invention belongs to the technical field of metal casting equipment, and in particular relates to a slide rail springback fixing device for centrifugal casting equipment.

Background technique

Centrifugal casting is a technical method that uses the high-speed rotation of the mold to make the molten metal in the mold centrifugally move to fill the mold and form a casting. Centrifugal casting was originally used to produce cast pipes, and the production of cast iron pipes, internal combustion engine cylinder liners and shaft sleeves is the most common. With the development of technology, some small special-shaped castings, such as small valves, motor rotors, impellers, etc., have also begun to be produced by investment casting + centrifugal casting. When using this production method, generally one furnace is matched with multiple sets of mold shells for pouring, and the mold shells are clamped and positioned by locking mechanisms or screw nuts. The casting mold shell and the long hole are connected to the rotary table, and the position of the ejector plate is adjusted through the adjusting nut, so that the mold shell and the sprue are close to the distributor. However, the clamping and positioning method of the above-mentioned screw lock nut is complicated to operate, and the mold shell is exposed to atmospheric conditions for a long time, which causes the temperature of the mold shell to drop, causing insufficient pouring and poor surface quality of the casting, and the complex structure of the workpiece increases the processing cost; And the clamping method of screws and nuts is easy to cause the rupture of the ceramic mold shell; in addition, after the mold shell is preheated or after centrifugal casting, there is a safety risk when the staff clamps and disassembles at high temperature; the unlocking mechanism is affected by the stress at high temperature and the mechanism may come out , so that there are hidden dangers in the casting process and reduce production efficiency.

Contents of the invention

In order to solve the above technical problems, the present invention provides a slide rail springback fixing mechanism dedicated to centrifugal casting equipment.

To achieve the above object, the complete technical solution of the present invention includes:

A slide rail rebound fixing device for centrifugal casting equipment, the slide rail rebound fixing device is installed on the turntable of the centrifugal casting equipment, the slide rail rebound fixing device includes a fixed slide rail, and the fixed slide rail is provided with a For the paired movable slider, the bottom of the movable slider is provided with a concave sliding step, and the top of the fixed slide rail is provided with a convex sliding step, and the concave sliding step and the convex sliding step cooperate with each other to realize sliding;

The inside of the front trapezoidal head of the movable slider is provided with a slider spring positioning hole, and the fixed slide rail is provided with a slide rail spring positioning hole, and a spring is arranged between the slider spring positioning hole and the slide rail spring positioning hole, and the fixed slide rail Connect with the active slider;

There are positioning holes matching the movable slider on the centrifugal turntable, and the bottom surface of both sides of the movable slider is provided with stop bosses. It is stuck on the centrifugal turntable and then plays a positioning role. When the centrifugation stops, the movable slider loses the centrifugal force and is pulled back by the spring to leave the positioning hole of the centrifugal turntable.

The fixed slide rail and the movable slide block paired with it are arranged symmetrically along the axis of the centrifugal turntable.

There are three groups of fixed slide rails and movable sliders paired with them, and the angles between them are 120°.

The fixed slide rail is fixed on the formwork pressing plate frame, and the formwork pressing plate support is located above the centrifugal turntable.

When the equipment works centrifugally, the stretched length of the spring does not exceed the safety factor of the spring.

Compared with the prior art, the present invention has the advantages that: when in use, the mechanism can realize automatic assembly and separation under centrifugal action, and it is convenient to clamp and disassemble; the movable slider is provided with a stop boss to ensure that the automatic rebound mechanism will not fail At the same time, it can ensure that the mold shell can be firmly fixed during centrifugal work; the structure is simple and easy to process; it greatly reduces the risk of high-temperature operation for staff, improves working conditions, and increases production efficiency.

Description of drawings

Figure 1 is a drawing of the slide rail rebound fixing device when the centrifugal casting machine is working;

Fig. 2 is the front view cross-section of the formwork plate holder with the slide rail rebound fixing mechanism when it works centrifugally;

Figure 3 is a top view of the slide rail rebound fixing device when the centrifugal casting machine is in standby;

Fig. 4 is A-A sectional view of Fig. 3;

Fig. 5 is a front view of the movable slider;

Fig. 6 is the side view of movable slider;

Fig. 7 is the structural view of movable slider;

Fig. 8 is a structural view of the fixed slide rail.

In the figure: 1-movable slider; 2-centrifugal turntable, 3-fixed slide rail, 4-mould pressing plate frame, 5-spring, 6-mould supporting plate, 7-mould, 8-pin hole; 9- Drive shaft, 10-slide block spring positioning hole, 11-stop boss, 12-concave sliding step, 13-sliding rail spring positioning hole, 14-convex sliding step.

Detailed ways

The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only for illustration and are not intended to limit this application.

As shown in Figures 1-8, the slide rail rebound fixing device disclosed in the present invention includes a centrifugal turntable 2 connected to the transmission shaft 9 of the centrifugal drive mechanism, and the centrifugal turntable 2 is provided with axisymmetrically arranged Fixed slide rail 3, in the present embodiment, fixed slide rail 3 has three groups altogether, and mutual angle is 120 °, and each group of fixed slide rail is provided with the movable slide block 1 that matches with it, and the bottom of movable slide block 1 is provided with There is a concave sliding step 12, and a convex sliding step 14 is arranged above the fixed slide rail 3, and the concave sliding step 12 and the convex sliding step 14 cooperate with each other to realize sliding.

The inside of the front trapezoidal head of the movable slider 1 is provided with a slider spring positioning hole 10, the fixed slide rail 3 is provided with a slide rail spring positioning hole 13, and the spring 5 is fixedly connected to the slider spring positioning hole 10 and the slide rail spring positioning hole 13 , connect the fixed slide rail 3 with the movable slide block 1.

There are positioning holes matching the movable slider on the centrifugal turntable, and stop bosses 11 are provided on both sides of the movable slider. 11. Clamp it on the centrifugal turntable 2 so as to play a positioning role, so as to prevent the spring 5 from being invalid due to plastic deformation;

The fixed slide rail 3 is fixed on the formwork plate holder 4, the centrifugal turntable 2 is provided with a formwork support plate 6, and the formwork support plate 6 is provided with a cylinder corresponding to the pin hole 8 of the formwork platen support 4, the mold Positioning holes matching the movable slider 1 are also provided on the shell supporting plate 6 . The mold case pressing plate holder 4 and the mold case pressing plate clamp constitute the fixing mechanism of the casting formwork 7, which plays the role of fixing the mold case during centrifugation; the pin hole 8 on the formwork pressing plate holder 4 realizes the positioning on the horizontal direction of the centrifugal turntable 2, The slide rail springback fixing mechanism on the formwork plate holder 4 realizes the clamping and positioning in the vertical direction.

Further, when the device works centrifugally, the stretched length of the spring 5 does not exceed its safety factor.

Before the centrifugal work, put the preheated mold shell 7 corresponding to the mold shell support plate 6 into the centrifugal turntable 2, and then install the mold shell pressing plate frame 4; when the centrifugal work is performed, the centrifugal force on the movable slider 1 is much greater than that of the spring 5 pulling force, the slider 1 slides outward under the action of centrifugal force and enters the positioning hole on the centrifugal turntable 2, and positions and fixes the mold shell during the centrifugal rotation process, and positions through the stop boss 11 at the bottom of the movable slider 1 The radial sliding distance of the movable slider 1 avoids the failure of the plastic deformation of the spring 5; when the centrifugal force stops, the movable slider 1 loses the centrifugal force and is pulled back by the spring 5, which realizes the centrifugal fixing of the mold shell 7 and facilitates the mold shell 7 and the mold shell. Clamping and dismounting of the shell pressing frame 4.

The invention has simple and compact structure, ingenious mechanism design, good stability in use, realizes the automatic clamping of the formwork in the working state and the automatic disassembly after the work is over, and avoids the temperature drop of the formwork caused by the long-term exposure of the formwork to the atmospheric condition. The risk of insufficient pouring of castings is conducive to improving production efficiency, reducing the risk of operators operating at high temperatures, and improving working conditions.

The following is a brief description of the centrifugal casting equipment used in conjunction with the invention and its working principle:

The vacuum centrifugal casting chamber includes a packaging body, the packaging body is composed of a furnace cover and a furnace wall seal, and can be packaged into a closed space structure. The centrifugal turntable is arranged in the vacuum centrifugal casting chamber after packaging, and the crucible is arranged above the centrifugal turntable; The bottom of the crucible is provided with pre-opening holes required for molten metal casting, and the crucible is connected with the sprue and the formwork sequentially through the bottom with the pre-opening holes; The disclosed sliding rail rebound fixing mechanism jointly fixes the formwork, and the centrifugal turntable is connected to the centrifugal shaft through a quick-change joint, which can realize the disassembly of the centrifugal shaft and the package body and transmit centrifugal force, and the centrifugal shaft drives the centrifugal turntable to rotate. There is a movable induction melting coil above the crucible, which moves from top to bottom during the melting process to conduct induction melting on the ingot in the ingot. During the melting process, as the coil moves from top to bottom, the ingot is gradually melted from top to bottom. Melting is realized, so that when the induction melting coil reaches the bottom, the entire ingot is completely melted, and the molten metal flows into the mold shell from the pre-opened bottom of the disposable crucible for centrifugal casting, because the coil moves from top to bottom during the melting process , the temperature of the upper metal liquid is slightly higher than that of the lower metal liquid, realizing a certain temperature gradient from top to bottom, and at the same time flowing into the mold from the bottom of the crucible. Compared with the existing pouring crucible, the alloy liquid is always being heated by the coil, which can , Completely melt the master alloy ingot to ensure the continuous flow of molten metal during the pouring process. In order to ensure a reasonable pouring temperature and prevent under-casting of thin-walled parts caused by low superheat or coarse grains caused by high superheat, the moving speed of the coil is controlled in the following way:

为线圈向下移动速度，单位为m/s；

为线圈加热功率，单位为W；

为线圈的移动行程，单位为m；

为铸造所用合金换算后的相变潜热，单位为J/Kg；

为铸造所用合金的浇注过热度，单位为℃；

为铸造所用合金的液态比热容，单位为J/(Kg·℃)；

为铸锭质量，单位为Kg；

为加热损耗系数，取值范围为0.3~0.9。In the formula,

is the downward moving speed of the coil, the unit is m/s;

is the heating power of the coil, in W;

is the moving distance of the coil, the unit is m;

It is the converted latent heat of phase transformation of the alloy used in casting, in J/Kg;

is the pouring superheat of the alloy used for casting, in °C;

is the liquid specific heat capacity of the alloy used for casting, in J/(Kg °C);

is the mass of the ingot, in Kg;

is the heating loss coefficient, and the value range is 0.3~0.9.

Through the design of the package, the centrifugal casting equipment realizes vacuuming, induction melting, centrifugal casting, cooling and solidification at the same time with the help of multiple packages in one centrifugal casting equipment, which greatly improves the production efficiency. The induction melting coil moves down into the area where the disposable crucible is located, and moves from top to bottom to heat the ingot by induction melting, so that the ingot is gradually melted from top to bottom. After the entire ingot is completely melted, the alloy liquid flows from the disposable crucible The pre-opened bottom is poured into the formwork for centrifugal casting.

The above applications are only some embodiments of the present application. Those skilled in the art can make several modifications and improvements without departing from the inventive concept of the present application, and these all belong to the protection scope of the present application.

Claims (3)

1. A slide rail resilience fixing device for centrifugal casting equipment is characterized in that the slide rail resilience fixing device is installed on a centrifugal turntable of the centrifugal casting equipment and comprises a fixed slide rail, a movable slide block matched with the fixed slide rail is arranged on the fixed slide rail, a concave sliding step is arranged at the bottom of the movable slide block, a convex sliding step is arranged above the fixed slide rail, and the concave sliding step and the convex sliding step are matched with each other to realize sliding;

a slide block spring positioning hole is formed in the inner side of the trapezoidal head in front of the movable slide block, a slide rail spring positioning hole is formed in the fixed slide rail, a spring is arranged between the slide block spring positioning hole and the slide rail spring positioning hole, and the fixed slide rail is connected with the movable slide block;

the centrifugal turntable is provided with a positioning hole matched with the movable sliding block, the bottom surfaces of the two side edges of the movable sliding block are provided with stop bosses, the movable sliding block enters the positioning hole of the centrifugal turntable during centrifugal work, the movable sliding block is clamped on the centrifugal turntable by the stop bosses to play a role in positioning, and the movable sliding block loses centrifugal force and is pulled back by the spring to leave the positioning hole of the centrifugal turntable when the centrifugation stops.

2. The slide rail resilient mounting apparatus for a centrifugal casting machine as claimed in claim 1, wherein the fixed slide rail and the movable slide block are paired with each other and have three sets of angles of 120 ° with each other.

3. The slide rail rebound fixing device for the centrifugal casting equipment as claimed in claim 2, wherein the fixed slide rail is fixed on a formwork holding plate frame, and the formwork holding plate frame is located above the centrifugal turntable.

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