CN107030951B - Slurry pump bionic piston casting forming method and forming device - Google Patents

Abstract

The invention discloses a slurry pump bionic piston casting forming method and a forming device. The device of the invention mainly comprises an upper die cover, a central support, a bottom die base and a middle die, wherein the upper die cover is provided with a male die, and the bottom die base is provided with a female die. The male die structure is used for forming the hollow part of the piston cup, and the female die structure is used for fixing the high styrene butadiene styrene skeleton base rubber. The upper part of the middle shaft is used for forming the hollow part where the piston connecting rod is located, and the lower part of the middle shaft is matched with the middle positioning hole of the bottom die holder to play a centering role. A bionic structure unit is designed on the middle die, and the bionic pit structure can be formed at one time after die assembly. The method and the device of the invention have simple principle and structure and high repeatability, and can be used for the batch production of the bionic pit-shaped piston.

Description

A mud pump imitation life piston casting molding method and molding device

technical field

The invention relates to a casting molding method and molding device for a mud pump imitating a piston. The casting molding method and device are used to cast bionic pistons for pit type mud pumps. On the basis of traditional sealed and wear-resistant pistons, bionic pits are added to the pistons, and the pit structure can be molded at one time.

Background technique

Whether it is about the energy development of conventional oil and natural gas, or the further development of shale oil and shale gas, mud pumps used in drilling equipment are inseparable. The mud pump transports mud from the bottom of the well during the drilling process, and carries the drilling cuttings to the surface through the mud. Two key components in this mud circulation process are the cylinder liner and the piston. Conditions such as high sand content, high viscosity, and high corrosiveness of the conveying medium, as well as the high-pressure working conditions of the reciprocating motion between the piston and the cylinder liner, may cause the piston to fail and affect the service life of the piston.

The idea of biomimetic non-smooth structures comes from organisms in nature. In the course of evolution, in order to adapt to changes in the environment, its body surface has formed a structure with certain characteristics. The Key Laboratory of Engineering Bionics, Ministry of Education, Jilin University has found through a lot of investigation and research that many animals have non-smooth structures on their body surfaces. The shapes of these non-smooth structures include convex hull, scale, pit and stripe. The dimple structure is the basis of the cast piston of the present invention.

There are regularly arranged dorsal pores distributed between each segment on the body surface of the earthworm. When the earthworm enters the soil, it secretes lubricating body fluid through the dorsal pore array, which is convenient for walking through the soil. Based on the function of the back hole on the surface of earthworms, combined with a large number of research results on the wear resistance and drag reduction of pits, a mud pump imitation life piston with pits on the surface is designed.

Contents of the invention

The purpose of the present invention is to provide a processing technology for pit type mud pump imitation life piston on the basis of existing traditional mud pump piston and stripe groove mud pump piston processing method. Through the designed mold device, the bionic unit in the shape of a pit is processed on the piston cup, and then the performance of the piston is improved from three aspects of sealing, lubrication, and wear resistance, and the service life of the piston is improved. The traditional pit processing method is single processing one by one. The invention changes the traditional pit processing method, and utilizes the bionic structure unit on the middle mold to form the pit structure and array arrangement on the entire piston cup at one time.

The mud pump imitation piston casting molding method of the present invention comprises the following steps:

Step 1: With the lower positioning hole facing upwards, fix the bottom mold base on the processing platform; fix the high-styrene-butadiene-styrene skeleton bottom glue on the concave mold of the bottom mold base;

Step 2: After the high-styrene-butadiene-styrene skeleton primer is fixed, place the lower sealing gasket on the upper edge of the bottom mold base;

Step 3: After the lower sealing gasket is placed, install the center support on the bottom mold base; the lower positioning pins are closely matched with the lower positioning holes, and the other three sets of lower positioning pins are matched with the lower positioning holes in the same way;

Step 4: Apply a uniform downward force on the center support; clamp the middle mold and the center support, and match the positioning pins of the middle mold with the through holes on the center support one by one;

Step 5: Use the fastening clip to make the middle mold and the center support tightly combined; the through hole on the fastening clip is used for clamping;

Step 6: After the middle mold and the center support are molded together, place the upper sealing gasket on the upper edge of the center support;

Step 7: The upper mold cover and the center support are molded together, and the center axis is well matched with the center positioning hole. Use a brush to wipe the silicone oil release agent on the surface, and place the high-styrene-butadiene-styrene skeleton primer on the bottom of the mold cavity. Then fill the elastic rubber; at the same time, the upper positioning hole is closely matched with the corresponding upper positioning pin; apply a downward and uniform force on the upper mold cover, and the mold clamping is completed. After the mold is closed, a flat vulcanizer is used for pressurization and vulcanization to complete the casting.

A molding device used in a mud pump imitation piston casting molding method, including an upper mold cover, a punch, a central shaft, a central support, a middle mold, a fastening clip, a die and a bottom mold base, and the central support has an upper positioning pin and a lower Locating pin, the center support surface has a through hole, the lower part of the upper mold cover is provided with a punch, the bottom mold base is provided with a die, the bottom mold base has a lower positioning hole and a central positioning hole, and the middle mold is located between the bottom mold base and the upper mold. Between the covers, the central support is installed on the bottom mold base, the central shaft is inserted into the central positioning hole, the lower positioning pin is inserted into the lower positioning hole to closely match and position, the upper sealing gasket is arranged on the upper edge of the central support, and the lower sealing gasket The sheet is set at the upper edge of the bottom mold base; the upper mold cover has an upper positioning hole, and the upper positioning pin is inserted into the upper positioning hole for positioning; the positioning pin of the middle mold is matched with the through hole on the center support one by one, and the front part of the positioning pin A protruding rod is extended, the protruding rod passes through the through hole, and the protruding rod and the through hole constitute a bionic structural unit; the mold and the center support are clamped by the fastening clip, and the fastening clip has a through hole for clamping.

The biomimetic structure formed by the biomimetic structural unit is in the shape of a pit.

The fastening clip clamps the middle mold and the center support, and the fastening clip has a through hole for clamping; the middle mold has a bionic structural unit,

The punch is used to form the hollow part of the piston cup (elastic rubber). The upper part of the central shaft is used for forming the hollow part where the piston connecting rod is located, and the lower part of the central shaft cooperates with the central positioning hole of the base mold base to play a centering role. The concave mold is used to fix the high styrene-butadiene-styrene skeleton primer. The central support is used for clamping the upper mold cover and the bottom mold base, and also plays the role of positioning the middle mold. There are through holes on the middle mold, and the number of the through holes is consistent with the positioning pins of the middle mold with structural dimensions. The bionic structure unit is used to form the pit structure on the piston cup.

Beneficial effects of the present invention:

The principle of the mud pump imitation piston casting molding method of the present invention is simple and easy to realize, and the purpose of one-time molding of the pit structure on the surface of the imitation piston can be achieved by using the method. The molding device of the present invention has a simple structure and is suitable for mass production in enterprises.

Description of drawings

Fig. 1 is a schematic perspective view of a molding device of the present invention.

Fig. 2 is a front view of the molding device of the present invention.

Fig. 3 is a three-dimensional schematic view of the bottom mold base of the forming device.

Fig. 4 is a top view of the bottom mold base of the forming device.

Fig. 5 is a schematic perspective view of the upper sealing gasket and the lower sealing gasket of the molding device.

Fig. 6 is a three-dimensional schematic view of the mold cover, the punch and the central shaft on the molding device.

Fig. 7 is a partial perspective view of the mold in the molding device.

Fig. 8 is a schematic perspective view of the central support of the forming device.

Detailed ways

As shown in Figure 1 and Figure 2, the mud pump imitation piston casting molding method of the present invention comprises the following steps:

The first step: the lower positioning hole 16 faces upward, and the bottom mold base 17 is fixed on the processing platform; the high-styrene-butadiene-styrene skeleton primer is fixed on the die 15 of the bottom mold base 17;

Step 2: After the high styrene-butadiene-styrene skeleton primer is fixed, place the lower sealing gasket 18 on the upper edge of the bottom mold base 17;

Step 3: After the lower sealing gasket 18 is placed, install the central support 6 on the bottom mold base 17; Reasonably coordinate with positioning;

Step 4: apply a uniform downward force on the center support 6; clamp the middle mold 11 and the center support 6, and match the positioning pins 10 of the middle mold 11 with the through holes 7 on the center support 6;

Step 5: use the fastening clip 12 to tightly combine the middle mold 11 and the center support 6; the through hole 13 on the fastening clip 12 is used for clamping;

Step 6: After the middle mold 11 and the center support 6 are closed, place the upper sealing gasket 4 on the upper edge of the center support 6;

Step 7: The upper mold cover 1 and the center support 6 are molded together, and the center shaft 3 is well matched with the center positioning hole 14. Use a brush to wipe the silicone oil release agent on the surface, and put the high-styrene-butadiene-styrene skeleton primer on the The bottom of the mold cavity is then filled with elastic rubber; at the same time, the upper positioning hole 19 of the upper mold cover 1 is closely matched with the corresponding upper positioning pin 5; a uniform downward force is applied on the upper mold cover 1 to compress, and the mold closing is completed. After the mold is closed, a flat vulcanizer is used for pressurization and vulcanization to complete the casting.

As shown in Figures 1 to 8, a molding device used in a mud pump imitation piston casting molding method includes an upper mold cover 1, a punch 2, a central shaft 3, a central support 6, a middle mold 11, a fastening clip 12, Die 15 and bottom mold base 17, center support 6 has upper positioning pin 5 and lower positioning pin 8, center support 6 surface has through hole 7, the bottom of upper mold cover 1 is provided with punch 2, and bottom mold base 17 is provided with Die 15 is arranged, bottom mold base 17 has lower positioning hole 16 and center positioning hole 14, and middle mold 11 is positioned between bottom mold base 17 and upper mold cover 1, and center support 6 is installed on the bottom mold base 17, and axis 3 Inserted in the central positioning hole 14, the lower positioning pin 8 is inserted in the lower positioning hole 16 for tight fit positioning, the upper sealing gasket 4 is arranged on the upper edge of the central support 6, and the lower sealing gasket 18 is arranged on the upper edge of the bottom mold base 17 The upper mold cover 1 has an upper positioning hole 9, and the upper positioning pin 5 is inserted into the upper positioning hole 9 for positioning; the positioning pin 10 of the middle mold 11 is matched with the through hole 7 on the center support 6 in one-to-one correspondence, and the positioning pin 10 front A protruding rod 101 is extended from the upper part, and the protruding rod 101 passes through the through hole 7, and the protruding rod 101 and the through hole 7 form a bionic structural unit; the fastening clip 12 clamps the middle mold 11 and the central support 6, and the fastening clip 12 has a through hole 13 for clamping.

The punch 2 is used for forming the hollow part of the piston cup (elastic rubber). The upper part of the central axis 3 is used for forming the hollow part where the piston connecting rod is located, and the lower part of the central axis 3 cooperates with the central positioning hole 14 of the bottom mold base 17 to play a centering role. Die 15 is used for fixing high styrene-butadiene-styrene skeleton primer. The central support 6 is used for mold closing of the upper mold cover 1 and the bottom mold base 17, and also plays a role in positioning the middle mold 11. There are through holes 7 on the middle mold 11, and the quantity of the through holes 7 is consistent with the locating pins 10 of the middle mold 11 in structural dimensions. The bionic structure unit 9 is used for forming the pit structure on the piston cup.

Claims (1)

1. A casting molding method of a mud pump imitation piston, the molding device used includes an upper mold cover (1), a punch (2), a central shaft (3), a central support (6), a middle mold (11), a fastening Clamp (12), die (15) and bottom mold base (17), the center support (6) has an upper positioning pin (5) and a lower positioning pin (8), and the surface of the center support (6) has a through hole (7) , the lower part of the upper mold cover (1) is provided with a punch (2), the bottom mold base (17) is provided with a die (15), and the bottom mold base (17) has a lower positioning hole (16) and a central positioning hole ( 14), the middle mold (11) is located between the bottom mold base (17) and the upper mold cover (1), the central support (6) is installed on the bottom mold base (17), and the middle shaft (3) is inserted into the central positioning hole In (14), the lower positioning pin (8) is inserted into the lower positioning hole (16) for tight fit positioning, the upper sealing gasket (4) is set at the upper edge of the center support (6), and the lower sealing gasket (18) is set At the upper edge of the bottom mold base (17); the upper mold cover (1) has an upper positioning hole (9), and the upper positioning pin (5) is inserted into the upper positioning hole (9) for positioning; the positioning pin of the middle mold (11) (10) One-to-one matching with the through hole (7) on the center support (6), the front part of the positioning pin (10) is extended with a protruding rod (101), and the protruding rod (101) passes through the through hole (7), protruding The rod (101) and the through hole (7) constitute a bionic structural unit; the fastening clip (12) clamps the middle mold (11) and the center support (6), and the fastening clip (12) has a through hole (13) for Clamp; It is characterized in that: comprising the following steps: Step 1: With the lower positioning hole (16) facing upwards, fix the bottom mold base (17) on the processing platform; fix the high-styrene-butadiene-styrene skeleton primer on the die (15) of the bottom mold base (17) superior; Step 2: After the high-styrene-butadiene-styrene skeleton primer is fixed, place the lower sealing gasket (18) on the upper edge of the bottom mold base (17); Step 3: After the lower sealing gasket (18) is placed, install the center support (6) on the bottom mold base (17); the lower positioning pin (8) is closely matched with the lower positioning hole (16), and the other three sets The lower positioning pin (8) cooperates with the lower positioning hole (16) for positioning in the same way; Step 4: Apply a uniform downward force on the center support (6) and press it tightly; clamp the middle mold (11) and the center support (6), and the positioning pin (10) of the middle mold (11) and the center support ( 6) The through holes (7) on the top are matched one by one; Step 5: Use the fastening clip (12) to tightly combine the middle mold (11) and the center support (6); the through hole (13) on the fastening clip (12) is used for clamping; Step 6: After the middle mold (11) and the center support (6) are molded together, place the upper sealing gasket (4) on the upper edge of the center support (6); Step 7: The upper mold cover (1) is molded with the central support (6), and the central axis (3) is well matched with the central positioning hole (14). The ethylene-butadiene-styrene skeleton primer is placed at the bottom of the mold cavity, and then filled with elastic rubber; at the same time, the upper positioning hole (19) of the upper mold cover (1) is closely matched with the corresponding upper positioning pin (5); on the upper mold cover ( 1) Apply a uniform downward force on the top and press it tightly, and the mold clamping is completed; after clamping the mold, use a flat vulcanizer to pressurize and vulcanize to complete the casting.

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