Casting method for air inlet and exhaust pipe assembly of air cylinder

Abstract

The invention relates to the technical field of casting, in particular to an air cylinder air inlet and exhaust pipe assembly casting method which comprises the following steps: a preparation procedure: a mold group is selected, cleaned and sprayed with powder, and the mold group comprises a lower female mold, a first upper male mold, a middle sand mold and a second upper male mold; and the pouring amount is set. A primary die-casting process: pouring alloy into the lower female die, and closing the first upper male die and the lower female die; and after pressurization, pressure maintaining and pressure relief, the first upper male mold is removed, and the middle sand mold is placed in. The alloy is poured into the lower female die containing the middle sand die, and the second upper male die and the lower female die are closed; and after pressurization, pressure maintaining and pressure relief, the second upper male die is removed. The blank in the lower female die is removed, and the middle sand die in the blank is cleaned. According to the casting method for the air inlet and exhaust pipe assembly of the air cylinder, the die-casting mode is high in production efficiency, and the problems of shrinkage cavities, shrinkage porosity and shrinkage sinking are not prone to occurring; and the amount of injected metal liquid is accurately controlled.

Description

Technical Field

[0001] The invention relates to the technical field of casting, and in particular to a method for casting a cylinder intake and exhaust pipe assembly. Background Art

[0002] Casting is one of the most basic methods in the manufacturing industry. Casting is a process that injects molten metal materials into a mold and cools and solidifies them to form the desired shape. According to the production process, casting is divided into: die casting, sand casting, weightless casting, low-pressure casting, etc. At present, casting has been widely used in the automotive industry, aerospace, construction industry, electronic equipment, agricultural machinery and other fields, and has made great progress.

[0003] The cylinder intake and exhaust pipe assembly is composed of a main pipe and a manifold. The main pipe is a box-shaped structure with multiple openings, and the manifold is a curved tubular structure with openings at both ends. The conventional production method is to use sand casting. However, the conventional sand casting production method still has the following shortcomings: 1. The sand mold needs to be manually turned over, which results in low production efficiency; 2. The casting method has a high defective rate; 3. The burrs and reserved holes produced during pouring need to be cut, ground and polished, which wastes both manpower and raw materials. Summary of the invention

[0004] In order to solve the technical problems existing in the background technology, the present invention provides a method for casting a cylinder intake and exhaust pipe assembly. The die-casting method has high production efficiency and is not prone to problems such as shrinkage cavities, shrinkage, and shrinkage; the amount of injected metal liquid is accurately controlled.

[0005] The technical solution adopted by the present invention is: A method for casting a cylinder intake and exhaust pipe assembly, comprising: A. Preparation process: Select a mold set and clean and spray powder, the mold set includes: a lower female mold, a first upper male mold, an intermediate sand mold, and a second upper male mold; Set the pouring volume; B. One-step die-casting process: Pour the alloy into the lower female mold, and close the first upper male mold with the lower female mold; After pressurizing, maintaining and releasing the pressure, the first upper positive mold is removed and the middle sand mold is placed; C. Secondary die casting process: Pour the alloy into the lower female mold containing the middle sand mold, and close the second upper male mold with the lower female mold; After pressurizing, maintaining and releasing the pressure, the second upper positive mold is removed; D. Demolding process: Remove the blank from the lower female mold and clean the middle sand mold inside the blank.

[0006] Furthermore, the casting method is implemented by a casting device, comprising: A supporting mechanism for moving the lower female mold is provided with a lifting mechanism for closing the mold, applying pressure, maintaining pressure, and releasing pressure, and the lifting mechanism is electrically connected to the control mechanism.

[0007] Furthermore, the support mechanism comprises: A "concave" shaped lower base is arranged horizontally, a slide is arranged through the inner bottom of the lower base, a limited position slide is arranged at the end of the slide, a supporting wheel group is arranged on the inner bottom of the lower base outside the slide, and a reflecting grating is arranged on the lower base outside the supporting wheel group.

[0008] Furthermore, two slideways are arranged in parallel, and the upper end surface of the limiting slide seat is higher than the upper end surface of the slideway, and the two are smoothly transitioned.

[0009] Furthermore, the supporting wheel groups are symmetrically arranged in two groups, including: A crossover seat and a tension spring are fixedly arranged on the inner bottom of the lower base. A hinged arm is hingedly arranged on the crossover seat. A support wheel is rotatably arranged on one end of the hinged arm, and the other end is hingedly connected to the tension spring.

[0010] Furthermore, the supporting wheel is composed of a small wheel and a large wheel, the small wheel is rollingly connected to the lower end surface of the lower female mold, and the large wheel is slidingly connected to the side wall of the lower female mold.

[0011] Furthermore, the lifting mechanism comprises: A lifting slide rod group is fixedly arranged on the lower base, and an upper top seat is fixedly arranged on the upper end of the lifting slide rod group. A first pressure cylinder and a second pressure cylinder are arranged in parallel on the upper top seat. The first pressure cylinder and the second pressure cylinder are electrically connected to the control mechanism respectively, and the stroke ends of the first pressure cylinder and the second pressure cylinder respectively penetrate the upper top seat and extend downward.

[0012] Furthermore, the lifting slide rod groups are arranged in two groups in parallel, and the first upper male mold and the second upper male mold are respectively slidably connected to the two groups of lifting slide rod groups. The first upper male mold is fixedly connected to the stroke end of the first pressure cylinder, and the second upper male mold is fixedly connected to the stroke end of the second pressure cylinder.

[0013] Furthermore, a sealing rod group is movably arranged on the lower female mold, the sealing rod group extends downward and is provided with a lower cross plate at the lower end, a sliding skid slidably connected to the slideway and the limiting slide seat is provided on the lower end surface of the lower cross plate, and a thrust spring is provided on the outer sleeve of the rod portion of the sealing rod group, and both ends of the thrust spring are respectively abutted against the lower end surface of the lower female mold and the upper end surface of the lower cross plate.

[0014] Furthermore, the lower edge of the slide is arranged in an arc shape, so as to facilitate the slide to slide from the slideway to the limiting slide seat.

[0015] The advantages of the cylinder intake and exhaust pipe assembly casting method of the present invention are: 1. Through two die-casting processes, the production efficiency and qualified rate can be improved, and the waste of manpower and material resources can be reduced; 2. Use the middle sand mold to ensure the hollow structure of the cylinder intake and exhaust pipe assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation of the present invention, the drawings required in the specific implementation are briefly introduced below. The drawings in the following description are implementations of the present invention.

[0017] Figure 1 The present invention provides a method for casting a cylinder intake and exhaust pipe assembly. Figure 1 ; Figure 2 The present invention provides a method for casting a cylinder intake and exhaust pipe assembly. Figure 2 ; Figure 3 The present invention provides a method for casting a cylinder intake and exhaust pipe assembly. Figure 3 ; Figure 4 The present invention provides a method for casting a cylinder intake and exhaust pipe assembly. Figure 4 ; Figure 5 It is a three-dimensional schematic diagram of a supporting wheel assembly in an apparatus for providing a method for casting a cylinder intake and exhaust pipe assembly according to an example of the present invention; Figure 6 It is a top-down stereoscopic schematic diagram of the lower female mold in the equipment of a method for casting a cylinder intake and exhaust pipe assembly provided by an example of the present invention; Figure 7 The present invention provides a three-dimensional top view of a first upper positive mold and a second upper positive mold in a device for a method for casting a cylinder intake and exhaust pipe assembly according to an example of the present invention.

[0018] In the figure: 1. Support mechanism, 10. Lower base, 11. Slideway, 12. Limiting slide, 13. Support wheel set, 14. Opposing grating, 130, cross-connection seat, 131, tension spring, 132, articulated arm, 133, support wheel, 2. Lifting mechanism, 20. Lifting slide rod assembly, 21. Upper seat, 22. First pressure cylinder, 23. Second pressure cylinder, 3. Die set, 31. Lower female mold, 32. First upper male mold, 33. Middle sand mold, 34. Second upper male mold, 311. Sealing rod assembly, 312. Lower cross plate, 313. Sled, 314. Thrust spring. DETAILED DESCRIPTION

[0019] In order to more clearly and specifically explain the specific implementation purpose and implementation mode of the present invention, the technical solution of the present invention will be fully described below. The described embodiments are part of the embodiments of the present invention, but not all of them. Without making creative work, all other embodiments based on the embodiments described in the present invention belong to the protection scope of the present invention.

[0020] The present invention provides a method for casting a cylinder intake and exhaust pipe assembly, which is implemented by a casting device, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, including: The supporting mechanism 1 for moving the lower female mold 31 comprises: A "concave" lower base 10 is arranged horizontally, and a slideway 11 is arranged on the inner bottom of the lower base 10. A limited position slide 12 is arranged at the end of the slideway 11. Two slideways 11 are arranged in parallel. The upper end surface of the limited position slide 12 is higher than the upper end surface of the slideway 11, and the two are smoothly transitioned. A support wheel group 13 is arranged on the inner bottom of the lower base 10 outside the slideway 11. The support wheel group 13 is symmetrically arranged in two groups, such as Figure 5 As shown, it includes: a cross-connection seat 130 fixedly arranged on the inner bottom of the lower base 10, and a tension spring 131, the cross-connection seat 130 is hingedly provided with a hinged arm 132, one end of the hinged arm 132 is rotatably provided with a support wheel 133, and the other end is hinged to the tension spring 131, the support wheel 133 is composed of a small wheel and a large wheel, the small wheel is rollingly connected to the lower end surface of the lower female mold 31, and the large wheel is slidingly connected to the side wall of the lower female mold 31; a corresponding grating 14 is arranged on the lower base 10 outside the supporting wheel group 13.

[0021] The support mechanism 1 is provided with a lifting mechanism 2 for mold closing, pressurizing, maintaining pressure, and releasing pressure. The lifting mechanism 2 is electrically connected to the control mechanism and includes: A lifting slide bar group 20 is fixedly arranged on the lower base 10, and an upper top seat 21 is fixedly arranged on the upper end of the lifting slide bar group 20. A first pressure cylinder 22 and a second pressure cylinder 23 are arranged in parallel on the upper top seat 21. The first pressure cylinder 22 and the second pressure cylinder 23 are respectively electrically connected to the control mechanism. The stroke ends of the first pressure cylinder 22 and the second pressure cylinder 23 respectively penetrate the upper top seat 21 and extend downward; the lifting slide bar group 20 is arranged in two groups in parallel, such as Figure 7As shown, the first upper male mold 32 and the second upper male mold 34 are respectively slidably connected on the two groups of lifting slide rod groups 20, the first upper male mold 32 is fixedly connected to the stroke end of the first pressure cylinder 22, and the second upper male mold 34 is fixedly connected to the stroke end of the second pressure cylinder 23.

[0022] like Figure 6 As shown, a sealing rod group 311 is movably arranged on the lower female mold 31, and the sealing rod group 311 extends downward and is provided with a lower cross plate 312 at the lower end, and a slide 313 is provided on the lower end surface of the lower cross plate 312 for sliding connection with the slide 11 and the limiting slide 12, and the lower edge of the slide 313 is arranged in an arc shape to facilitate the slide 313 to slide from the slide 11 to the limiting slide 12, and a thrust spring 314 is provided on the outer sleeve of the rod part of the sealing rod group 311, and the two ends of the thrust spring 314 are respectively abutted against the lower end surface of the lower female mold 31 and the upper end surface of the lower cross plate 312.

[0023] According to the specific structure of the casting equipment in the above embodiment, a method for casting a cylinder intake and exhaust pipe assembly is further described below: A. Preparation process: Select mold set 3 and clean and spray powder. The mold set 3, such as Figure 1 , Figure 7 As shown, it includes: a lower female mold 31, a first upper male mold 32, an intermediate sand mold 33, and a second upper male mold 34; Set the pouring volume.

[0024] B. One-step die-casting process: The alloy is poured into the lower female mold 31, and the control mechanism controls the stroke end of the first pressure cylinder 22 to extend downward, driving the first upper male mold 32 to move downward along the lifting slide rod group 20 and close the mold with the lower female mold 31; After pressurization, pressure maintenance and pressure relief, the control mechanism controls the stroke end of the first pressure cylinder 22 to extend upward, driving the first upper male mold 32 to move upward along the lifting slide rod group 20, removing the first upper male mold 32 from the lower female mold 31, and placing it in the intermediate sand mold 33.

[0025] C. Secondary die casting process: The alloy is poured into the lower female mold 31 containing the intermediate sand mold 33, and the control mechanism controls the stroke end of the second pressure cylinder 23 to extend downward, driving the second upper male mold 34 to move downward along the lifting slide rod group 20 and close the mold with the lower female mold 31; After pressurization, pressure maintenance and pressure relief, The control mechanism controls the stroke end of the second pressing cylinder 23 to extend upward, driving the second upper male mold 34 to move upward along the lifting slide rod assembly 20 , and removing the second upper male mold 34 from the lower female mold 31 .

[0026] D. Demolding process: The slide 313 slides from the slideway 11 to the limit slide seat 12, the lower cross plate 312 is pushed up, and drives the sealing plug rod assembly 311 to move upward, and the blank is removed from the lower female mold 31; Clean the intermediate sand mold 33 inside the blank.

[0027] Based on the above, an embodiment of a method for casting a cylinder intake and exhaust pipe assembly of the present invention is used as inspiration. Through the above description, relevant personnel can make various changes and modifications without departing from the technical idea of ​​the present invention.

Claims

1. A method for casting a cylinder intake and exhaust pipe assembly, characterized in that: include: A. Preparation process: Selecting a mold set (3) and cleaning and spraying powder, the mold set (3) comprising: a lower female mold (31), a first upper male mold (32), an intermediate sand mold (33), and a second upper male mold (34); Set the pouring volume; B. One-step die-casting process: Pouring alloy into the lower female mold (31), and closing the first upper male mold (32) with the lower female mold (31); After pressurizing, maintaining and releasing the pressure, the first upper male mold (32) is removed and the middle sand mold (33) is placed in. C. Secondary die casting process: Pouring alloy into a lower female mold (31) containing an intermediate sand mold (33), and closing the second upper male mold (34) with the lower female mold (31); After pressurizing, maintaining and releasing the pressure, the second upper male mold (34) is removed; D. Demolding process: The blank is removed from the lower female mold (31) and the intermediate sand mold (33) inside the blank is cleaned.

2. A method for casting a cylinder intake and exhaust pipe assembly according to claim 1, characterized in that: The casting method is implemented by a casting device, comprising: A support mechanism (1) for moving a lower female mold (31) is provided on the support mechanism (1) with a lifting mechanism (2) for performing mold closing, pressurization, pressure maintenance, and pressure relief, and the lifting mechanism (2) is electrically connected to a control mechanism.

3. A method for casting a cylinder intake and exhaust pipe assembly according to claim 2, characterized in that: The supporting mechanism (1) comprises: A "concave" shaped lower base (10) is arranged horizontally, a slideway (11) is arranged on the inner bottom of the lower base (10), a limit slideway (12) is arranged at the end of the slideway (11), a supporting wheel group (13) is arranged on the inner bottom of the lower base (10) outside the slideway (11), and a reflecting grating (14) is arranged on the lower base (10) outside the supporting wheel group (13).

4. A method for casting a cylinder intake and exhaust pipe assembly according to claim 3, characterized in that: Two slideways (11) are arranged in parallel, and the upper end surface of the limiting slide seat (12) is higher than the upper end surface of the slideway (11), and the two are smoothly transitioned.

5. The method for casting a cylinder intake and exhaust pipe assembly according to claim 3, characterized in that: The supporting wheel groups (13) are symmetrically arranged in two groups, including: A crossover seat (130) and a tension spring (131) are fixedly arranged on the inner bottom of the lower base (10); a hinged arm (132) is hingedly arranged on the crossover seat (130); a support wheel (133) is rotatably arranged on one end of the hinged arm (132), and the other end is hingedly connected to the tension spring (131).

6. A method for casting a cylinder intake and exhaust pipe assembly according to claim 5, characterized in that: The supporting wheel (133) is composed of a small wheel and a large wheel, the small wheel is rollingly connected to the lower end surface of the lower female mold (31), and the large wheel is slidingly connected to the side wall of the lower female mold (31).

7. The method for casting a cylinder intake and exhaust pipe assembly according to claim 3, characterized in that: The lifting mechanism (2) comprises: A lifting slide rod group (20) is fixedly arranged on the lower base (10), and an upper top seat (21) is fixedly arranged on the upper end of the lifting slide rod group (20). A first pressure cylinder (22) and a second pressure cylinder (23) are arranged in parallel on the upper top seat (21). The first pressure cylinder (22) and the second pressure cylinder (23) are respectively electrically connected to the control mechanism, and the stroke ends of the first pressure cylinder (22) and the second pressure cylinder (23) respectively penetrate the upper top seat (21) and extend downward.

8. The method for casting a cylinder intake and exhaust pipe assembly according to claim 7, characterized in that: The lifting slide bar groups (20) are arranged in two groups in parallel, and the first upper male mold (32) and the second upper male mold (34) are respectively slidably connected to the two groups of lifting slide bar groups (20). The first upper male mold (32) is fixedly connected to the stroke end of the first pressure cylinder (22), and the second upper male mold (34) is fixedly connected to the stroke end of the second pressure cylinder (23).

9. The method for casting a cylinder intake and exhaust pipe assembly according to claim 7, characterized in that: A sealing rod group (311) is movably arranged on the lower female mold (31), and the sealing rod group (311) extends downward and is provided with a lower transverse plate (312) at the lower end, and a sliding pry (313) slidably connected to the slideway (11) and the limit slide seat (12) is provided on the lower end surface of the lower transverse plate (312), and a thrust spring (314) is provided on the outer sleeve of the rod portion of the sealing rod group (311), and two ends of the thrust spring (314) are respectively in contact with the lower end surface of the lower female mold (31) and the upper end surface of the lower transverse plate (312).

10. A method for casting a cylinder intake and exhaust pipe assembly according to claim 9, characterized in that: The lower edge of the slide (313) is arranged in an arc shape, so as to facilitate the slide (313) to slide from the slideway (11) to the limit slide seat (12).

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