Casting production process of superimposed valve

Abstract

The present invention relates to a casting production process for a superimposed valve, which includes a main valve body, an upper first flow port, an upper second flow port, an upper third flow port, an upper fourth flow port, an upper fifth flow port, a lower flow port, a lower second flow port, a lower third flow port, a lower fourth flow port, a lower fifth flow port, a left first flow port, a right first flow port, a first flow channel, a second flow channel, a third flow channel, a fourth flow channel, a fifth flow channel, a sixth flow channel, and a seventh flow channel. The main valve body is configured as a rectangular valve body, and the upper end of the main valve body is designed with five upper flow ports, and the five upper flow ports are V-shaped; the lower end of the main valve body is designed with five lower flow ports, and the five lower flow ports are V-shaped. The advantages are ingenious design, reasonable and compact structure, and improved heating block process. For risers that do not shrink, the top closure is broken and connected to the outside, making it an atmospheric pressure riser to achieve gravity shrinkage compensation. Four 5mm high support points are designed at the bottom of the heating block so that the heating block can float and generate 100% overall buoyancy.

Description

Technical Field

[0001] The invention relates to the field of valve body casting, and in particular to a casting production process for a stacked valve. Background Art

[0002] Currently, the domestic industry is large but not strong, with overcapacity in mid- and low-end products and almost complete reliance on imports for high-end hydraulic components. The hydraulic industry's development lags significantly behind that of the mainframe industry, becoming a major bottleneck restricting the development of the equipment manufacturing industry. Currently, the overall manufacturing technology level of my country's hydraulic components industry still lags behind that of advanced countries. Jiayite Machinery Technology Co., Ltd., a leading provider of complete transmission systems for agricultural machinery, ranks among the top companies in China. As a key component in agricultural machinery hydraulic systems, the superimposed valve features advanced design and high technological content.

[0003] However, during the casting process, the inside of the U-shaped groove on the mud core corresponding to the superimposed valve should have been a flat surface. However, after dissecting the castings, it was found that this position was concave and shrunk. On the far right is the dissected riser of the casting, which did not shrink. In this test, there were 12 castings in two boxes, 10 of which shrunk, with a pass rate of 1 / 6. The qualified castings had shrinkage holes on the upper part of the risers, while the other 5 risers had no shrinkage holes and were smooth. The 5 risers that did not shrink did not compensate for the shrinkage of the casting. After the molten iron is poured, a layer of iron shell is formed on the upper part of the riser when it cools. When the riser shrinks, negative pressure is formed on the upper part, and the outside air pressure cannot be connected to the riser. As the riser continues to cool, the negative pressure on the upper part increases, and finally it approaches a vacuum, becoming a weightless riser, which does not compensate for the shrinkage of the casting and may even cause back-drawing. Summary of the Invention

[0004] In order to solve the above problems, the present invention proposes a casting production process for a superimposed valve, which has an ingenious design, a reasonable and compact structure, no deformation of the internal flow channel of the product, and no shrinkage at the pouring cap mouth.

[0005] The technical solution of the present invention:

[0006] The casting production process of the superimposed valve, the superimposed valve includes a main valve body, an upper first flow port, an upper second flow port, an upper third flow port, an upper fourth flow port, an upper fifth flow port, a lower flow port, a lower second flow port, a lower third flow port, a lower fourth flow port, a lower fifth flow port, a left first flow port, a right first flow port, a first flow channel, a second flow channel, a third flow channel, a fourth flow channel, a fifth flow channel, a sixth flow channel, and a seventh flow channel. The main valve body is arranged into a rectangular valve body. Five upper flow ports are designed on the upper end of the main valve body and the five upper flow ports are V-shaped. The five upper flow ports are respectively the upper flow port, the upper second flow port, the upper third flow port, the upper fourth flow port, and the upper fifth flow port. Five lower flow ports are designed on the lower end of the main valve body and the five lower flow ports are V-shaped. The five lower flow ports are respectively the lower flow port, the lower second flow port, the lower third flow port, the lower fourth flow port, and the lower fifth flow port.

[0007] The upper first flow outlet and the lower flow outlet are connected vertically through the first flow channel, the upper second flow outlet and the lower second flow outlet are connected vertically through the second flow channel, the upper third flow outlet and the lower third flow outlet are connected vertically through the third flow channel, and the upper fourth flow outlet and the lower fourth flow outlet are connected vertically through the fourth flow channel.

[0008] A seventh flow channel is designed in the middle of the right side of the main valve body. The mouth of the seventh flow channel is connected to the right first flow channel mouth. An inverted U-shaped groove is provided at the bottom of the seventh flow channel. A right-angled trapezoidal groove is designed above and below the U-shaped groove. The minimum inner angle positions of the two right-angled trapezoidal grooves are respectively designed to be semicircular grooves. The upper five flow channel mouths are connected to the upper semicircular groove through the fifth flow channel mouth, and the lower five flow channel mouths are connected to the lower semicircular groove through the sixth flow channel mouth. The right-angle sides of the two right-angled trapezoidal grooves are respectively connected to the middle two sides of the seventh flow channel through a transition flow channel.

[0009] An eighth circular groove is further designed on the left side of the main valve body. The mouth of the eighth circular groove is designed to be a bell mouth, and the outer side of the bell mouth is connected to the left first flow outlet.

[0010] A middle annular groove is respectively designed in the middle of the first flow channel, the second flow channel, the third flow channel and the fourth flow channel.

[0011] L-shaped steps are respectively provided on both sides of the right end of the main valve body, and a rectangular groove is also designed on the upper side of the right end of the main valve body.

[0012] The casting production process of the superimposed valve is to first make a sand box and a mud core, the mud core is placed in the sand box, and a first pouring riser is reserved at the upper end of one side of the mud core. A first pouring channel is designed at the first pouring riser position reserved for the mud core position inside the sand box. When casting the superimposed valve, two superimposed valve casting sand boxes are used to share the same main pouring cap mouth. The first pouring risers of the mud cores in the two sand boxes are designed and placed relatively, so that the first pouring channels of the two sand boxes are connected and a riser nest is formed in the middle position. A main pouring riser is designed on one side of the riser nest and one side of the riser nest is connected to the main pouring riser through a second pouring flow channel. A heating block is also placed in the riser nest. The heating block is configured as a rectangular block and a support foot is respectively installed at the four corners of the lower end of the heating block.

[0013] A conical groove is designed in the middle of the lower end of the heating block, and the height of the supporting foot is 5mm.

[0014] The mud core is shaped like the internal flow channel and flow channel opening of the superimposed valve. The mud core also includes a rectangular hollow sand frame for fixing the mud core. A first pouring port is designed on one side of the sand frame.

[0015] The main technical parameters of the casting production process of the stacking valve are: 1) material: QT450-10; 2) tensile strength: ≥400MPa; 3) hardness: HB120-175; 5) no shrinkage holes or shrinkage defects; 6) unit weight: 3.5kg.

[0016] The advantages of this invention are its ingenious design, compact structure, and customer satisfaction. The product technology is refined, and the heating block process is improved. For non-shrinking risers, the top seal is broken open and connected to the outside, making them atmospheric pressure risers, achieving gravity shrinkage compensation. Four 5mm high support points are designed at the bottom of the heating block to enable the heating block to float, generating 100% overall buoyancy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the superimposed valve of the present invention Figure 1 .

[0018] Figure 2 This is a schematic diagram of the superimposed valve of the present invention Figure 2 .

[0019] Figure 3 It is a left and right vertical sectional view at the middle position of the present invention.

[0020] Figure 4 It is a left and right vertical sectional view of the first flow channel of the present invention.

[0021] Figure 5 It is a left and right vertical sectional schematic diagram of the third flow channel of the present invention.

[0022] Figure 6 It is a front and rear vertical sectional view of the U-shaped groove of the present invention.

[0023] Figure 7 It is a front and rear transverse cross-sectional view of a right-angled trapezoidal groove on one side of the present invention.

[0024] Figure 8 It is a three-dimensional schematic diagram showing hidden lines of the present invention.

[0025] Figure 9 It is a schematic diagram of a sand box and a sand core used in processing a superimposed valve of the present invention.

[0026] Figure 10 Schematic diagram of the sand core of the present invention.

[0027] Figure 11 It is a side view schematic diagram of the superimposed valve of the present invention.

[0028] Figure 12 It is a bottom view schematic diagram of the superimposed valve of the present invention. DETAILED DESCRIPTION

[0029] Refer to the attached Figure 1-8 The casting production process of the stacking valve includes a main valve body 1, an upper first flow port 2, an upper second flow port 3, an upper third flow port 4, an upper fourth flow port 5, an upper fifth flow port 6, a lower flow port 7, a lower second flow port 8, a lower third flow port 9, a lower fourth flow port 10, a lower fifth flow port 11, a left first flow port 12, a right first flow port 13, a first flow channel 14, a second flow channel 15, a third flow channel 16, a fourth flow channel 17, a fifth flow channel 18, a sixth flow channel 19, and a seventh flow channel 20. The main valve body 1 is configured as a rectangular valve body. The upper end of the main valve body 1 is designed with five upstream flow openings, and the five upstream flow openings are V-shaped. The five upstream flow openings are an upper first flow opening 2, an upper second flow opening 3, an upper third flow opening 4, an upper fourth flow opening 5, and an upper fifth flow opening 6. The lower end of the main valve body 1 is designed with five downstream flow openings, and the five downstream flow openings are V-shaped. The five downstream flow openings are a lower flow opening 7, a lower second flow opening 8, a lower third flow opening 9, a lower fourth flow opening 10, and a lower fifth flow opening 11.

[0030] The upper first flow channel 2 and the lower second flow channel 7 are connected vertically through the first flow channel 14, the upper second flow channel 3 and the lower second flow channel 8 are connected vertically through the second flow channel 15, the upper third flow channel 4 and the lower third flow channel 9 are connected vertically through the third flow channel 16, and the upper fourth flow channel 5 and the lower fourth flow channel 10 are connected vertically through the fourth flow channel 17.

[0031] A seventh flow channel 20 is designed in the middle of the right side of the main valve body 1, and the mouth of the seventh flow channel 20 is connected to the right flow channel mouth 13. An inverted U-shaped groove 21 is provided at the bottom of the seventh flow channel 20, and a right-angled trapezoidal groove 22 is designed above and below the U-shaped groove 21. The minimum inner angle positions of the two right-angled trapezoidal grooves 22 are designed to be semicircular grooves 23 respectively. The upper five flow channel mouths 6 are connected to the upper semicircular groove 23 through the fifth flow channel 18, and the lower five flow channel mouths 11 are connected to the lower semicircular groove 23 through the sixth flow channel 19; the right-angle sides of the two right-angled trapezoidal grooves 22 are respectively connected to the middle two sides of the seventh flow channel 20 through a transition flow channel 27; the mouth of the seventh flow channel in the figure is also designed to be a bell mouth.

[0032] An eighth circular groove 24 is further designed on the left side of the main valve body 1 . The mouth of the eighth circular groove 24 is designed to be a bell mouth, and the outer side of the bell mouth is connected to the left primary flow opening 12 .

[0033] A middle annular groove 28 is respectively provided in the middle of the first flow channel 14 , the second flow channel 15 , the third flow channel 16 , and the fourth flow channel 17 .

[0034] L-shaped steps 25 are respectively provided on both sides of the right end of the main valve body 1 , and a rectangular groove 26 is also designed on the upper side of the right end of the main valve body 1 .

[0035] Refer to the attached Figure 9-12The casting production process of the stacking valve is to first make a sand box 101 and a mud core 102, the mud core 102 is placed in the sand box 101, and a first pouring port 111 is reserved at the upper end of one side of the mud core 102. A first pouring channel 103 is designed at the position of the first pouring port 111 reserved at the position of the mud core 102 inside the sand box 101. When casting the stacking valve, two stacking valves are used to cast the mud core 102 to share the same main pouring cap port 104. The first The pouring and rising ports 111 are designed to be positioned relative to each other, so that the first pouring channels 103 of the two flasks 101 are connected, forming a riser nest 105 in the middle. A main pouring and rising port 104 is designed on one side of the riser nest 105, and the riser nest 105 is connected to the main pouring and rising port 104 via a second pouring channel 109. A heating block 106 is also placed in the riser nest 105. The heating block 106 is designed as a rectangular block, and support legs 107 are installed at the four corners of the lower end of the heating block 106. All flasks can be designed to share the same flask. Figure 9 As shown in the figure, six products are poured simultaneously, two in a group, and two of the groups also use the main pouring riser 104, so as to reasonably utilize the mold space of the sand box 101 and improve the output.

[0036] A conical groove 108 is designed in the middle of the lower end of the heating block 106, and the height of the supporting foot 107 is 5 mm. The heating block is designed to be a trapezoidal body with a small upper end and a large lower end.

[0037] The mud core 102 is a mud core 1020 modeled after the internal flow channel and flow channel opening of the superimposed valve. The mud core 102 also includes a rectangular hollow sand frame 110 for fixing the mud core. A first pouring opening 111 is designed on one side of the sand frame 110.

[0038] The main technical parameters of the casting production process of the stacking valve are: 1) material: QT450-10; 2) tensile strength: ≥400MPa; 3) hardness: HB120-175; 5) no shrinkage holes or shrinkage defects; 6) unit weight: 3.5kg.

[0039] In order to break the iron shell that solidifies first above the riser. Make external air pressure act directly on the liquid molten iron and use heating block 106 at the riser. Using heating block 106 is effective, but it must be floated to the liquid surface so that no sealed shell is formed on the riser. Check the bottom of the riser nest 105 in the sand box 101 mold and find that it is flat, not arc-shaped. Once the heating block 106 is firmly attached to the bottom, it cannot produce buoyancy. If you want it to produce buoyancy, you will want the heating block 106 to produce an upward thrust. The heating block 106 itself has a larger draft angle. When the small side of the heating block 106 is facing downward, there is an upward thrust. The other is that the molten iron rushes the heating block 106 to leave the bottom when it is turned over to produce buoyancy. Add four 5mm high support points at the bottom of the heating block 106. When using, put it gently with four feet facing downward. This ensures that the heating block 100% emerges.

Claims

1. The casting production process of the superimposed valve is characterized by: The superimposed valve includes a main valve body, an upper first flow port, an upper second flow port, an upper third flow port, an upper fourth flow port, an upper fifth flow port, a lower flow port, a lower second flow port, a lower third flow port, a lower fourth flow port, a lower fifth flow port, a left first flow port, a right first flow port, a first flow channel, a second flow channel, a third flow channel, a fourth flow channel, a fifth flow channel, a sixth flow channel, and a seventh flow channel. The main valve body is arranged into a rectangular valve body. Five upper flow ports are designed at the upper end of the main valve body, and the five upper flow ports are V-shaped. The five upper flow ports are respectively the upper flow port, the upper second flow port, the upper third flow port, the upper fourth flow port, and the upper fifth flow port; five lower flow ports are designed at the lower end of the main valve body, and the five lower flow ports are V-shaped. The five lower flow ports are respectively the lower flow port, the lower second flow port, the lower third flow port, the lower fourth flow port, and the lower fifth flow port; The upper first flow outlet and the lower flow outlet are connected vertically through the first flow channel, the upper second flow outlet and the lower second flow outlet are connected vertically through the second flow channel, the upper third flow outlet and the lower third flow outlet are connected vertically through the third flow channel, and the upper fourth flow outlet and the lower fourth flow outlet are connected vertically through the fourth flow channel. A seventh flow channel is designed in the middle of the right side of the main valve body. The mouth of the seventh flow channel is connected to the right first flow channel mouth. An inverted U-shaped groove is provided at the bottom of the seventh flow channel. A right-angled trapezoidal groove is designed above and below the U-shaped groove. The minimum inner angle positions of the two right-angled trapezoidal grooves are respectively designed to be semicircular grooves. The upper five flow channel mouths are connected to the upper semicircular groove through the fifth flow channel mouth, and the lower five flow channel mouths are connected to the lower semicircular groove through the sixth flow channel mouth. The right-angle sides of the two right-angled trapezoidal grooves are respectively connected to the middle two sides of the seventh flow channel through a transition flow channel. An eighth circular groove is also designed on the left side of the main valve body, and the mouth of the eighth circular groove is designed to be a bell mouth and the outer side of the bell mouth is connected to the left flow channel mouth; an intermediate ring groove is designed in the middle of the first flow channel, the second flow channel, the third flow channel, and the fourth flow channel; L-shaped steps are respectively opened on both sides of the right end of the main valve body, and a rectangular groove is also designed on the upper side of the right end of the main valve body near one side; the casting production process of the superimposed valve is to first make a sand box and a mud core, and the mud core is placed in the sand box, and a first pouring gate is reserved at the upper end of one side of the mud core, and a first pouring channel is designed at the first pouring gate position reserved for the mud core position inside the sand box. When casting the superimposed valve, two superimposed valve casting sand boxes share the same main pouring gate, and the first pouring gates of the mud cores in the two sand boxes are designed and placed relatively, so that the first pouring channels of the two sand boxes are connected and the middle position is formed A riser nest is formed, a main pouring riser is designed on one side of the riser nest and one side of the riser nest is connected to the main pouring riser through a second pouring channel, a heating block is also placed in the riser nest, the heating block is arranged into a rectangular block and a supporting foot is respectively installed at the four corners of the lower end of the heating block; a conical groove is designed in the middle of the lower end of the heating block, and the height of the supporting foot is 5mm; the mud core is a mud core shaped in imitation of the internal flow channel and flow channel opening of the superimposed valve, the mud core also includes a rectangular hollow sand frame for fixing the mud core, and a first pouring riser is designed on one side of the sand frame; the main technical parameters of the casting production process of the superimposed valve are: 1) material: QT450-10; 2) tensile strength: ≥400MPa; 3) hardness: HB120-175; 5) no shrinkage cavity or shrinkage defect; 6) unit weight: 3.5kg.

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