A mo(u)ld assembly for lost foam casting of sugar cane press roll shells and method of use

Abstract

The application discloses a kind of for sugar cane press roller shell lost foam casting investment assembly and its use method, belong to metal casting technical field.It includes core shaft sleeve, several investment pieces and several pull rods;Center of investment piece is provided with through-hole, and several fastening holes are provided around through-hole;Several investment pieces are sleeved on core shaft sleeve by the through-hole, and pull rod is arranged in fastening hole;Investment piece is fusible material, and core shaft sleeve and pull rod are alloy steel.Core shaft sleeve and pull rod of the application become part of roller shell casting after casting, utilize the principle of insert casting, improve the strength and toughness of casting whole.It greatly reduces manufacturing cost and difficulty under the premise of guaranteeing the manufacturing precision of sugar cane press roller, and has good versatility and production flexibility, can meet the demand of large-scale production.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of metal casting, and particularly relates to a melting mold assembly for lost foam casting of a sugarcane press roller shell. BACKGROUND

[0002] A sugarcane press is an important mechanical device in a sugar factory, and is used to extract sugarcane juice. The production process of sugarcane juice extraction is a process of extracting sugarcane juice by multiple pressing and immersion after cutting sugarcane into small sections and then into filaments. A sugarcane press roller is a core component of a sugarcane juice extractor, and is used to extrude juice contained in the interior of sugarcane. The structure of the sugarcane press roller is composed of a roller body and a roller shell, and the two are connected by an interference fit to transmit a large torque. The traditional sugarcane press roller shell has a hollow structure, and the surface of the roller shell has a plurality of paired "V"-shaped toothed grooves. The roller surface with grooves can improve the holding capacity of the sugarcane during pressing, and has the effect of crushing and tearing the sugarcane material. The manufacturing method of the traditional sugarcane press roller is to cast a roller shell cylinder blank, and then to machine and cut the toothed grooves.

[0003] The holding capacity, crushing and tearing capacity of the traditional sugarcane press roller are limited, and the surface of the roller shell is severely worn and corroded after a period of work due to the huge pressure and friction force during work. A new type of sugarcane press roller shell is designed to solve the above problems, and the characteristic of the new type of sugarcane press roller shell is that the sugarcane press roller is provided with variable position cylindrical helical gears and juice discharge grooves on the surface of the roller shell. Specifically, as shown in Figure 7 The new type of sugarcane press roller shell has a plurality of pairs of variable position cylindrical helical gears arranged axially on the outer surface of the cylinder, each pair of variable position cylindrical helical gears is composed of two cylindrical helical gears with opposite helix angles and opposite variable position coefficients, and there is a juice discharge groove between the small ends of two adjacent cylindrical helical gears.

[0004] However, the surface structure of this new type of sugarcane press roller shell is complex, has a variable position cylindrical tooth surface profile, and there is a certain fitting relationship between the two press rollers, so there is a high precision requirement. The cost of using numerical control machining is too high, and the efficiency is low. The precision cannot be guaranteed by using the traditional casting method. Therefore, the lost foam casting method is used. Lost foam casting is a new type of casting method in which a foam model similar in size and shape to the casting is bonded and combined into a model cluster, coated with refractory paint and dried, then buried in the sand and vibrated to form a mold, and then poured under negative pressure, so that the model gasifies, the liquid metal occupies the position of the model, and the casting is formed after solidification and cooling. Lost foam casting can be used to manufacture complex shaped castings with high precision and good surface quality, which can meet the requirements of high precision and high surface quality parts.

[0005] However, the volume of the new sugarcane press roller shell is very large, the diameter is usually about 0.8-1.5 meters, and the length is about 8-10 meters. It is too high to make a foamed plastic model for the model equipment, and it is not easy to make. When the size is large, the material rigidity of the mold is poor and is easy to deform or damage, affecting the casting precision. The molding of the mold requires a special model equipment, so different roller shells require a special model equipment, which leads to high mold manufacturing cost and poor production flexibility. Especially for single piece or small batch production, it is not convenient and high cost. When the length of the sugarcane press roller needs to be modified, the model equipment needs to be re-made, which greatly increases the cost. SUMMARY

[0006] In order to solve the defects existing in the prior art, the purpose of the present application is to provide a mold assembly for sugarcane press roller shell lost foam casting and a use method thereof, which greatly reduces the manufacturing cost and difficulty under the premise of ensuring the manufacturing precision of the sugarcane press roller, has good universality and production flexibility, and can meet the needs of large-scale production.

[0007] The present application is realized by the following technical solutions:

[0008] A mold assembly for sugarcane press roller shell lost foam casting, comprising a mandrel sleeve, a plurality of mold pieces and a plurality of pull rods; a through hole is formed in the center of each mold piece, and a plurality of fastening holes are formed around the through hole; the plurality of mold pieces are sleeved on the mandrel sleeve through the through hole, and the pull rods are arranged in the fastening holes; the mold pieces are made of a fusible material, and the mandrel sleeve and the pull rods are made of alloy steel.

[0009] Preferably, the mold pieces are tooth peak mold pieces, tooth peak half mold pieces or end mold pieces.

[0010] Preferably, a positioning groove and a positioning protrusion are arranged on the inner wall of the mandrel sleeve and the through hole of the mold piece, respectively.

[0011] Further preferably, 6-10 positioning grooves and positioning protrusions are evenly distributed in the circumferential direction.

[0012] Preferably, position marks are arranged on the mold pieces to ensure the engagement relationship.

[0013] Preferably, the difference between the inner diameter and the outer diameter of the mold piece is not greater than 400 mm.

[0014] The use method of the mold assembly for sugarcane press roller shell lost foam casting disclosed in the present application comprises the following steps:

[0015] According to the size of the sugarcane press roller shell, the number of mold pieces is determined, all the mold pieces are sleeved on the mandrel sleeve, and the mold pieces are fixed by mutual adhesion; a plurality of pull rods are sleeved in the fastening holes for reinforcement; and the assembly of the entire press roller shell mold assembly is completed.

[0016] The assembled press roller shell investment casting assembly is subjected to lost foam casting, and the shaft sleeve and the plurality of pull rods serve as the base strengthening portions of the press roller shell castings after casting.

[0017] Compared with the prior art, the present application has the following beneficial technical effects:

[0018] The investment casting assembly for the press roller shell of sugar cane disclosed in the present application greatly reduces the manufacturing cost of the press roller of sugar cane while ensuring precision. Compared with the traditional casting method, the investment casting of the press roller of sugar cane is divided into single-piece investment casting pieces, thereby reducing the volume of the investment casting and further reducing the manufacturing difficulty. The investment casting pieces can be pressed by a model device for batch production, and only need to be bonded when the roller shell is cast. At the same time, this type of division method can freely combine each part, and different sizes of press roller shells can be cast by changing the number of investment casting pieces. In addition, if a part of the press roller of sugar cane needs to be modified, only the corresponding part of the investment casting single-piece press mold needs to be re-produced. Finally, the shaft sleeve and the pull rod of the present application become part of the roller shell castings after casting, and the strength and toughness of the whole castings are improved by using the principle of embedded casting.

[0019] Further, the through hole of the investment casting piece and the outer wall of the shaft sleeve are respectively provided with a positioning groove and a positioning protrusion matched with each other, which can ensure the required rigidity when the isolation layer is bonded.

[0020] Further, the investment casting piece is provided with a position marker for ensuring the meshing relationship, which can ensure the meshing relationship between the paired roller shells.

[0021] Further, the difference between the inner diameter and the outer diameter of the investment casting piece is not greater than 400 mm, which can further reduce the weight of the roller shell castings.

[0022] The use method of the investment casting assembly for the press roller shell of sugar cane described above has good precision, great flexibility, simple operation, low cost, and can meet the needs of large-scale production, and has good application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a whole structure schematic view of the investment casting assembly for the press roller shell of sugar cane of the present application;

[0024] Figure 2 It is a structure schematic view of three kinds of investment casting pieces;

[0025] Figure 3 It is a whole structure schematic view of the shaft sleeve;

[0026] Figure 4 It is a cross-sectional schematic view of the shaft sleeve;

[0027] Figure 5is a side view of the tooth peak mold piece;

[0028] Figure 6 is a side view of the end mold piece;

[0029] Figure 7 is a schematic diagram of the overall structure of the new sugarcane press roller shell;

[0030] Figure 8 is the structure arrangement of the triangular press roller in the embodiment

[0031] Figure 9 is a schematic diagram of the three-dimensional structure of the present application.

[0032] In the figure, 1-mold piece, 2-core sleeve, 3-pull rod, 4-positioning groove, 5-positioning protrusion, 6-fastening hole, 7-position marker, 101-tooth peak mold piece, 102-tooth peak half mold piece, 103-end mold piece. DETAILED DESCRIPTION

[0033] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments, which are an explanation of the present application rather than a limitation.

[0034] As Figure 1 , the mold assembly for the lost foam casting of the sugarcane press roller shell of the present application comprises a core sleeve 2, a plurality of mold pieces 1 and a plurality of pull rods 3; the mold piece 1 has a through hole in the center, and a plurality of fastening holes 6 are provided around the through hole; the plurality of mold pieces 1 are sleeved on the core sleeve 2 through the through hole, and the pull rod 3 is provided in the fastening hole 6; the mold piece 1 is of a fusible material, and the core sleeve 2 and the pull rod 3 are of an alloy steel.

[0035] As Figure 2 , in a more preferred embodiment of the present application, the mold piece 1 is a tooth peak mold piece 101, a tooth peak half mold piece 102 or an end mold piece 103.

[0036] As Figures 3 to 6 , in a more preferred embodiment of the present application, the through hole of the mold piece 1 and the outer wall of the core sleeve 2 are respectively provided with a positioning groove 4 and a positioning protrusion 5 that match each other. Preferably, the positioning groove 3 and the positioning protrusion 5 are uniformly distributed in 6-10 along the ring direction. Preferably, the positioning groove 4 and the positioning protrusion 5 are rectangular.

[0037] As Figure 5 , in a more preferred embodiment of the present application, the mold piece 1 is provided with a position marker 7 for ensuring the meshing relationship.

[0038] In a more preferred embodiment of the present application, the length of the core sleeve 2 is equal to that of the pull rod 3.

[0039] In a more preferred embodiment of the present application, the difference between the inner diameter and the outer diameter of the mold piece 1 is not greater than 400 mm.

[0040] In a preferred embodiment of the present invention, the material of the mandrel sleeve 2 is seamless steel pipe, and the material of the pull rod 3 is ferroalloy.

[0041] The usage method of the investment casting assembly for the sugarcane press roll shell lost foam casting includes:

[0042] As Figure 9 , according to the size of the sugarcane press roll shell, determine the number of investment casting sheets 1, put all the investment casting sheets 1 on the mandrel sleeve 2 in a sleeved manner, and bond and fix the investment casting sheets 1 to each other; put several pull rods 3 through the fastening holes 6 for reinforcement; complete the assembly of the entire press roll shell investment casting assembly.

[0043] As Figure 8 , in a specific embodiment, the 3 press rolls of the sugarcane press are arranged in a "pin" shape, including 1 top roll and 2 bottom rolls. Among them, both ends of the top roll are side flanges. Therefore, the investment casting assembly for the top roll casting is assembled by several tooth peak investment casting sheets 101, a pair of tooth peak half investment casting sheets 102 and end investment casting sheets 103 in the shape of side flanges. Both ends of the bottom roll are juice rings, and the investment casting assembly for the bottom roll casting is assembled by several tooth peak investment casting sheets 101 and end investment casting sheets 103 in the shape of juice rings.

[0044] Perform lost foam casting on the assembled press roll shell investment casting assembly. After casting, the mandrel sleeve 2 and several pull rods 3 serve as the matrix strengthening parts of the press roll shell casting.

[0045] It should be noted that the above is only a part of the embodiments of the present invention. Equivalent changes made according to the system described in the present invention are all included in the protection scope of the present invention. Those skilled in the art of the present invention can make similar substitutions for the specific examples described as long as they do not deviate from the structure of the present invention or exceed the scope defined by this claim book, and all belong to the protection scope of the present invention.

Claims

1. A mould assembly for the lost foam casting of sugar cane press roll shells, characterised in that, The application relates to a molten-mold piece assembly for a sugarcane pressing roller shell. The molten-mold piece (1) is a tooth-peak molten-mold piece (101), a tooth-peak half molten-mold piece (102) or an end molten-mold piece (103). The shell of the sugarcane pressing roller is provided with a plurality of pairs of variable-position cylindrical helical gears on the outer surface of the cylinder in the axial direction, each pair of variable-position cylindrical helical gears is composed of two cylindrical helical gears with opposite helix angles and opposite variable-position coefficients, and there is a juice discharge groove between the small ends of two adjacent cylindrical helical gears.

2. A mo(u)ld assembly for lost wa(v)er mo(u)lding of a cane press roll shell as claimed in claim 1, wherein, The through hole of the molten-mold piece (1) and the outer wall of the mandrel sleeve (2) are respectively provided with a matching positioning groove (4) and a positioning protrusion (5).

3. A mo(u)ld assembly for lost wa(v)er mo(u)lding of a cane press roll shell as claimed in claim 2, wherein, The positioning groove (4) and the positioning protrusion (5) are evenly distributed in the circumferential direction.

4. A mo(u)ld assembly for lost wa(v)er mo(u)lding of a cane press roll shell as claimed in claim 1, wherein, The molten-mold piece (1) is provided with a position mark (7) for ensuring the meshing relationship.

5. A mo(u)ld assembly for lost wa(v)er mo(u)lding of a cane press roll shell as claimed in claim 1, wherein, The difference between the inner diameter and the outer diameter of the molten-mold piece (1) is not greater than 400 mm.

6. A method of using the moU for sugarcane press roll shell lost foam casting according to any one of claims 1 to 5, characterized in that, The application relates to a molten-mold piece assembly for a sugarcane pressing roller shell. According to the size of the sugarcane pressing roller shell, the number of molten-mold pieces (1) is determined, all the molten-mold pieces (1) are sleeved on the mandrel sleeve (2), the molten-mold pieces (1) are fixed by mutual adhesion, a plurality of pull rods (3) are sleeved in the fastening holes (6) for reinforcement, and the assembly of the whole pressing roller shell molten-mold assembly is completed. The assembled pressing roller shell molten-mold assembly is subjected to lost foam casting, and the mandrel sleeve (2) and the plurality of pull rods (3) serve as the base strengthening part of the pressing roller shell casting.

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