Processing technology of electromagnetic control valve body castings for hydraulic components

Abstract

The present application relates to a kind of machining processes of electromagnetic control valve body castings for hydraulic components, design corebone center suspension type core box, two big mud cores respectively place a φ4mm corebone in, and correspond two ends in core box respectively open a U-shaped groove, the end of corebone is placed in U-shaped groove, solve the problem that main hole horizontal parting cannot place corebone;Big mud core and small mud core use low-gas artificial synthetic sand, sand grain shape coefficient≤1.2, refractoriness≥1800 degrees, while adding 30% ceramic sand with small area circular shape, the amount of resin can be reduced by 30%, its bending strength reaches more than 12Mpa, and gas emission is greatly reduced, solve the difficulty of casting gas hole exhaust and strength problem.The advantage is to realize the connection of oil path in the middle of oil path by using double oil path, and the flow or pressure of two oil ports is independently controlled during use, without affecting each other, reduce product cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of valve body casting, in particular to a machining process of electromagnetic control valve body casting for hydraulic components. BACKGROUND

[0002] The traditional valve body uses a single valve core for a single oil return path. If two oil returns are required, two valves must be combined, which is costly and not flexible enough in control. To meet the increasing requirements of hydraulic system functions, stability and automation control degree of Chinese engineering machinery products, and to meet market requirements, a kind of electromagnetic control valve is developed for supporting host manufacturers.

[0003] The electromagnetic control valve needs to realize the connection of the two oil paths in the middle of the oil path, and the flow or pressure of the two oil ports is independently controlled without affecting each other during use. At the same time, the two oil paths involve two main cores, and the flow channels on both sides of the main core are also complex, so vertical sand casting is used, but the main core is large and difficult to place and fix. SUMMARY

[0004] To solve the above technical problems, the present application provides a machining process of electromagnetic control valve body casting for hydraulic components, which is ingenious in design, reasonable and compact in structure, and realizes independent control of the flow or pressure of the two oil ports without affecting each other.

[0005] The technical scheme of the present application is as follows:

[0006] The machining process of the electromagnetic control valve body casting for hydraulic components, in the production process of the electromagnetic control valve body casting for hydraulic components, the mold cavity in the sand box is made according to the product shape, then the first main flow channel, the second main flow channel, the longitudinal flow channel, the horizontal flow channel, the first arc-shaped flow channel, the second arc-shaped flow channel, the third arc-shaped flow channel, the lower spiral flow channel, the upper spiral flow channel and the rest of the flow channel are designed and manufactured according to the product flow channel structure, then the main flow channel is placed in the sand box, the sand box is closed, the molten iron is poured from the reserved pouring hole, and the valve body casting is taken out after cooling, then the internal mud core is cleaned and removed, and the machining is completed.

[0007] The core bone center suspension type core box is designed, one φ4mm core bone is placed in each of the two large mud cores, and a U-shaped groove is opened at the corresponding two ends in the core box, the end of the core bone is placed in the U-shaped groove, and the problem of the main hole horizontal parting without core bone is solved.

[0008] The big and small cores are made of a low-gas artificial synthetic sand with a sand grain shape coefficient ≤1.2 and a refractoriness ≥1800 degrees, and 30% ceramic sand with a small circular area is added, the resin addition amount is reduced by 30%, the bending strength is above 12Mpa, the gas emission is greatly reduced, the casting gas hole exhaust difficulty and strength problem are solved; the pouring temperature is 1420 degrees; the molding process adopts the automatic line sand dropping shell method, the precoated sand shell improves the surface roughness of the product, the automatic line molding improves the compactness of the cavity to prevent the deformation and fracture of the flow channel caused by the shape expansion tank.

[0009] The electromagnetic control valve body casting for hydraulic components comprises a main body, a first main flow channel, a second main flow channel, a longitudinal flow channel, a transverse flow channel, a first arc-shaped flow channel, a second arc-shaped flow channel, a third arc-shaped flow channel, a lower spiral flow channel, an upper spiral flow channel, a first flow channel port, a second flow channel port, a third flow channel port, a fourth flow channel port, a fifth flow channel port, a sixth flow channel port, a seventh flow channel port and an eighth flow channel port.

[0010] The first flow channel port is arranged at an upper middle position of the front side of the main body, and the second flow channel port is arranged at an upper middle position of the rear side of the main body; two vertical flow channels are arranged in the main body, which are the first main flow channel and the second main flow channel; a longitudinal flow channel is arranged in the main body and located between the first main flow channel and the second main flow channel; the front end of the longitudinal flow channel is connected with the first flow channel port, and the rear end of the longitudinal flow channel is connected with the second flow channel port.

[0011] Two flow channel ports are arranged on the upper side of the main body, which are the third flow channel port and the fourth flow channel port; two flow channel ports are arranged on the lower side of the main body, which are the fifth flow channel port and the sixth flow channel port; two flow channel ports are arranged on the right side of the main body, which are the seventh flow channel port and the eighth flow channel port.

[0012] The first main flow channel comprises a large circular groove section, a small circular groove section, a first ring groove, a second ring groove, a third ring groove, a fourth ring groove and a fifth ring groove; the upper end of the large circular groove section is connected with the lower end of the small circular groove section; the upper end of the small circular groove section is connected with the third flow channel port; the lower end of the large circular groove section is connected with the fifth flow channel port; the first ring groove, the second ring groove, the third ring groove and the fourth ring groove are sequentially arranged on the upper surface of the small circular groove section from top to bottom; the fifth ring groove is arranged at a lower middle position of the large circular groove section; the left side of the third ring groove is connected with the left side of the upper end of the large circular groove section through the first arc-shaped flow channel.

[0013] The second main flow channel also comprises a large circular groove section, a small circular groove section, a first ring groove, a second ring groove, a third ring groove, a fourth ring groove and a fifth ring groove; the upper end of the large circular groove section is connected with the lower end of the small circular groove section; the upper end of the small circular groove section is connected with the fourth flow channel port; the lower end of the large circular groove section is connected with the sixth flow channel port; the first ring groove, the second ring groove, the third ring groove and the fourth ring groove are sequentially arranged on the upper surface of the small circular groove section from top to bottom; the fifth ring groove is arranged at a lower middle position of the large circular groove section; the right side of the third ring groove is connected with the right side of the upper end of the large circular groove section through the second arc-shaped flow channel.

[0014] The upper end of the large circular groove end of the first main flow channel on the right side is communicated with the upper end of the large circular groove end of the second main flow channel through a transverse flow channel, and the upper end of the large circular groove end of the second main flow channel on the right side is communicated with the eighth flow channel through a flow channel.

[0015] The right front side of the first annular groove of the first main flow channel is communicated with the left front side of the first annular groove of the second main flow channel through a third arc-shaped flow channel, and the right front side of the first annular groove of the second main flow channel is communicated with the seventh flow channel through a flow channel.

[0016] The right rear side of the second annular groove of the first main flow channel is communicated with the longitudinal flow channel through a lower spiral flow channel, and the right front side of the fourth annular groove of the first main flow channel is communicated with the longitudinal flow channel through an upper spiral flow channel.

[0017] The left front side of the second annular groove of the second main flow channel is communicated with the longitudinal flow channel through a lower spiral flow channel, and the left rear side of the fourth annular groove of the second main flow channel is communicated with the longitudinal flow channel through an upper spiral flow channel.

[0018] The inner side of the small circular groove section upper end of the first main flow channel is provided with an annular step, and the inner side of the small circular groove section upper end of the second main flow channel is also provided with an annular step.

[0019] The first main flow channel and the second main flow channel are arranged in parallel.

[0020] The lower end of the main body is provided with a plate-shaped support leg, the front end of the plate-shaped support leg is designed as two semicircular protrusions, and the rear end of the plate-shaped support leg is designed as a triangular plate.

[0021] The outer shape of the main body is formed in a concave-convex shape according to the use requirements of the hydraulic components.

[0022] The artificial synthetic sand comprises 68% of quartz sand, 28% of ceramic sand and 4% of resin by weight.

[0023] The ceramic sand is a circular ceramic sand.

[0024] The valve body casting has the advantages of ingenious design, reasonable and compact structure, realization of simultaneous casting of two oil channels with the middle part of the oil channel connected together, independent control of the flow or pressure of the two oil ports in the use process without mutual influence, reduced product cost, flexible valve body control, compliance with the market demand and great development prospect. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a front side schematic view of the valve body casting of the present application.

[0026] Figure 2 is a rear side schematic view of the valve body casting of the present application.

[0027] Figure 3 is a vertical sectional view schematic view of the valve body casting of the present application.

[0028] Figure 4 is the first annular groove of the first main flow channel and the second main flow channel of the valve body casting of the present application.

[0029] Figure 5 is the second annular groove of the first main flow channel and the second main flow channel of the valve body casting of the present application.

[0030] Figure 6 is the third annular groove of the first main flow channel and the second main flow channel of the valve body casting of the present application.

[0031] Figure 7 is the fourth annular groove of the first main flow channel and the second main flow channel of the valve body casting of the present application.

[0032] Figure 8 is the transverse flow channel of the valve body casting of the present application. DETAILED DESCRIPTION

[0033] Referring to the drawings Figures 1-8 The electromagnetic control valve body casting for hydraulic components comprises a main body 1, a first main flow channel 2, a second main flow channel 3, a longitudinal flow channel 4, a transverse flow channel 5, a first arc-shaped flow channel 6, a second arc-shaped flow channel 7, a third arc-shaped flow channel, a lower spiral flow channel 9, an upper spiral flow channel 10, a first flow channel port 11, a second flow channel port 12, a third flow channel port 13, a fourth flow channel port 14, a fifth flow channel port 15, a sixth flow channel port 16, a seventh flow channel port 17, an eighth flow channel port 18,

[0034] A first flow channel port 11 is arranged on the front side of the main body 1, and a second flow channel port 12 is arranged on the rear side of the main body 1; two vertical flow channels are arranged in the main body 1, which are the first main flow channel 2 and the second main flow channel 3; a longitudinal flow channel 4 is arranged in the main body 1, which is located between the first main flow channel 2 and the second main flow channel 3, and the front end of the longitudinal flow channel 4 is connected to the first flow channel port 11, and the rear end of the longitudinal flow channel 4 is connected to the second flow channel port 12,

[0035] Two flow channel ports are arranged on the upper side of the main body 1, which are the third flow channel port 13 and the fourth flow channel port 14, and two flow channel ports are arranged on the lower side of the main body 1, which are the fifth flow channel port 15 and the sixth flow channel port 16; two flow channel ports are arranged on the right side of the main body 1, which are the seventh flow channel port 17 and the eighth flow channel port 18.

[0036] The first main flow channel 2 comprises a large circular groove section 19, a small circular groove section 20, a first ring groove 21, a second ring groove 22, a third ring groove 23, a fourth ring groove 24, and a fifth ring groove 25. The upper end of the large circular groove section 19 is communicated with the lower end of the small circular groove section 20. The upper end of the small circular groove section 20 is communicated with the third flow channel port 13. The lower end of the large circular groove section 19 is communicated with the fifth flow channel port 15. The first ring groove 21, the second ring groove 22, the third ring groove 23, and the fourth ring groove 24 are sequentially arranged on the upper surface of the small circular groove section 20 from top to bottom. The fifth ring groove 25 is arranged at the middle lower position of the large circular groove section 19. The left side of the third ring groove 23 is communicated with the left side of the upper end of the large circular groove end through the first arc-shaped flow channel 6.

[0037] The second main flow channel 3 also comprises a large circular groove section 19, a small circular groove section 20, a first ring groove 21, a second ring groove 22, a third ring groove 23, a fourth ring groove 24, and a fifth ring groove 25. The upper end of the large circular groove section 19 is communicated with the lower end of the small circular groove section 20. The upper end of the small circular groove section 20 is communicated with the fourth flow channel port 14. The lower end of the large circular groove section 19 is communicated with the sixth flow channel port 16. The first ring groove 21, the second ring groove 22, the third ring groove 23, and the fourth ring groove 24 are sequentially arranged on the upper surface of the small circular groove section 20 from top to bottom. The fifth ring groove 25 is arranged at the middle lower position of the large circular groove section 19. The right side of the third ring groove 23 is communicated with the right side of the upper end of the large circular groove end through the second arc-shaped flow channel 7.

[0038] The right side of the upper end of the large circular groove end of the first main flow channel 2 is communicated with the left side of the upper end of the large circular groove end of the second main flow channel 3 through the transverse flow channel 5. The right side of the upper end of the large circular groove end of the second main flow channel 3 is communicated with the eighth flow channel port 18 through a flow channel.

[0039] The right front side of the first ring groove 21 of the first main flow channel 2 is communicated with the left front side of the first ring groove 21 of the second main flow channel 3 through the third arc-shaped flow channel. The right front side of the first ring groove 21 of the second main flow channel 3 is communicated with the seventh flow channel port 17 through a flow channel.

[0040] The right rear side of the second ring groove 22 of the first main flow channel 2 is communicated with the longitudinal flow channel 4 through the lower spiral flow channel 9. The right front side of the fourth ring groove 24 of the first main flow channel 2 is communicated with the longitudinal flow channel 4 through the upper spiral flow channel 10.

[0041] The left front side of the second ring groove 22 of the second main flow channel 3 is communicated with the longitudinal flow channel 4 through the lower spiral flow channel 9. The left rear side of the fourth ring groove 24 of the second main flow channel 3 is communicated with the longitudinal flow channel 4 through the upper spiral flow channel 10.

[0042] The upper end of the small circular groove section 20 of the first main flow channel 2 is provided with an annular step 26. The upper end of the small circular groove section 20 of the second main flow channel 3 is also provided with an annular step 26.

[0043] The first main flow channel 2 and the second main flow channel 3 are arranged in parallel.

[0044] The lower end of the main body 1 is provided with a plate-shaped support leg, the front end of which is designed as two semicircular protrusions 27, and the rear end of which is designed as a triangular plate 28.

[0045] The main body 1 is formed in a concave-convex shape according to the use requirements of the hydraulic component.

[0046] In the production process of the electromagnetic control valve body casting for the hydraulic component, the mold cavity in the sand box is made according to the product shape, the first main runner, the second main runner, the longitudinal runner, the transverse runner, the first arc-shaped runner, the second arc-shaped runner, the third arc-shaped runner, the lower spiral runner, the upper spiral runner and the rest of the small cores of the runners are designed and manufactured according to the runner structure of the product, then the large core of the main runner and the small cores of the rest of the runners are placed in the mold cavity of the sand box, the sand box is closed, the molten iron is poured from the reserved pouring gate, and after cooling, the sand box is opened, the valve body casting is taken out, the internal core is cleaned and removed, and the processing is completed.

[0047] A core bone center suspension type core box is designed, one φ4mm core bone is placed in each of the two large cores, and a U-shaped groove is opened at the corresponding two ends in the core box, and the end of the core bone is placed in the U-shaped groove, so that the problem of the core bone being unable to be placed in the main hole horizontal parting is solved.

[0048] The large core and the small core both adopt a kind of low-gas artificial synthetic sand, the sand particle shape coefficient is ≤1.2, the refractoriness is ≥1800 degrees, 30% ceramic sand with a small circular area is added, the resin addition amount can be reduced by 30%, the bending strength reaches more than 12Mpa, and the gas emission amount is greatly reduced, so that the problems of casting gas hole exhaust difficulty and strength are solved; the pouring temperature is 1420 degrees; the molding process adopts the method of automatic line sand drop shell, and the film-coated sand shell improves the surface roughness of the product, and the automatic line molding improves the compactness of the mold cavity to prevent the deformation and fracture of the runner caused by the shape expansion of the mold.

[0049] Main technical indicators:

[0050] Valve body weight: 4KG;

[0051] Material requirement: QT600-3;

[0052] Spheroidizing rate: 3 levels;

[0053] Hardness requirement: HB200-260;

[0054] Film-coated sand:

[0055] Tensile strength at room temperature: ≥1.8Mpa;

[0056] Bending strength at room temperature: ≥8.8Mpa;

[0057] Gas evolution: < 13 ml / g.

Claims

1. The processing technology of electromagnetic control valve body casting for hydraulic components, in the production process of electromagnetic control valve body casting for hydraulic components, the mold cavity in the sand box is made according to the product shape, then the large core of the first main runner and the second main runner and the small core of the longitudinal runner, the horizontal runner, the first arc-shaped runner, the second arc-shaped runner, the third arc-shaped runner, the lower spiral runner, the upper spiral runner and the rest of the runner are designed and manufactured according to the runner structure of the product, then the large core of the main runner and the small core of the rest of the runner are placed in the mold cavity of the sand box, the sand box is closed, the molten iron is poured from the reserved pouring gate, after cooling, the sand box is opened, the valve body casting is taken out, the internal core is cleaned and removed, and the processing is completed; The core bone center suspension type core box is designed, one φ4mm core bone is placed in each of the two large cores, and a U-shaped groove is opened at the corresponding two ends in the core box, the end of the core bone is placed in the U-shaped groove, and the problem of the core bone being unable to be placed in the main hole horizontal parting is solved; The large core and the small core both adopt a kind of low-gas artificial synthetic sand, the sand grain shape coefficient is ≤1.2, the refractoriness is ≥1800 degrees, the bending strength reaches more than 12Mpa, and the gas emission is greatly reduced, which solves the problems of casting gas hole exhaust difficulty and strength; the pouring temperature is 1420 degrees; the molding process adopts the method of automatic line sand falling shell, the film coated sand shell improves the surface roughness of the product, the automatic line molding improves the compactness of the mold cavity to prevent the deformation and fracture of the runner caused by the shape of the expanding box; The hydraulic component electromagnetic control valve body casting comprises a main body, a first main flow channel, a second main flow channel, a longitudinal flow channel, a transverse flow channel, a first arc-shaped flow channel, a second arc-shaped flow channel, a third arc-shaped flow channel, a lower spiral flow channel, an upper spiral flow channel, a first flow channel port, a second flow channel port, a third flow channel port, a fourth flow channel port, a fifth flow channel port, a sixth flow channel port, a seventh flow channel port and an eighth flow channel port.

2. The process for machining of electromagnetic control valve body casting for hydraulic components as claimed in claim 1 wherein, The first main flow channel comprises a large circular groove section, a small circular groove section, a first ring groove, a second ring groove, a third ring groove, a fourth ring groove and a fifth ring groove.

3. The process for machining of electromagnetic control valve body casting for hydraulic components as claimed in claim 1 wherein, The first main flow channel and the second main flow channel are arranged in parallel. The first main flow channel and the second main flow channel are arranged in parallel.

4. The process for machining of electromagnetic control valve body casting for hydraulic components as claimed in claim 1 wherein, The plate-shaped supporting leg is designed as two semicircular protrusions at the front end and a triangular plate at the rear end.

5. The process for machining of electromagnetic control valve body casting for hydraulic components as claimed in claim 1 wherein, The main body is formed in a concave-convex shape according to the use requirement of the hydraulic component.

6. The process for machining of electromagnetic control valve body casting for hydraulic components as claimed in claim 1 wherein, The artificial synthetic sand comprises 68% of quartz sand, 28% of ceramic sand and 4% of resin by weight.

7. The process for machining of electromagnetic control valve body casting for hydraulic components as claimed in claim 6 wherein, The ceramic sand is in the form of a circle.

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