A cemented carbide and steel joint structure

Abstract

The utility model belongs to the field of engineering machinery, concretely relates to a hard alloy and steel material's joint structure. The joint structure includes: alloy tooth head, steel base and joint body, alloy tooth head includes work end and alloy connecting end, steel base includes base body and steel connecting end, alloy connecting end and steel connecting end have protruding structure, joint body has recessed area with alloy connecting end and steel connecting end shape matching, alloy connecting end and steel connecting end are embedded in recessed area of joint body respectively. The joint body of the utility model is simple, and reasonable in design, and this structure guarantees the close combination of alloy head and steel base, and also has the high hardness, high wear resistance of hard alloy and the toughness and strength of steel, can provide excellent working performance and long service life under extreme working conditions, and can reduce the cost and reduce the material consumption of alloy head.

Description

Technical Field

[0001] This utility model belongs to the field of engineering machinery, and specifically relates to a connection structure between cemented carbide and steel. Background Technology

[0002] Hard alloy materials are widely used in cutting tools, drills, and other high-stress, high-wear environments due to their high hardness and wear resistance. Steel, with its good toughness and machinability, is often used for base structures. However, it is difficult to directly bond hard alloys and steel. Due to their different properties, they generally need to be fixed together by brazing. However, brazing requires high technical skills, and the bond strength of brazed structures is easily affected under conditions of high heat or severe vibration. Utility Model Content

[0003] To address the aforementioned problems and achieve the bonding between cemented carbide and steel, this invention proposes a bonding body for cemented carbide and steel, as well as a method for its preparation.

[0004] On the one hand, this utility model provides a connection structure between cemented carbide and steel, the connection structure comprising:

[0005] The device comprises an alloy tooth tip, a steel base, and a connector. The alloy tooth tip includes a working end and an alloy connecting end. The steel base includes a base body and a steel connecting end. The alloy connecting end and the steel connecting end have protruding structures. The connector has recessed areas that match the shapes of the alloy connecting end and the steel connecting end. The alloy connecting end and the steel connecting end are respectively embedded in the recessed areas of the connector.

[0006] Preferably, the protruding structure of the alloy connecting end includes a first columnar protrusion structure disposed in the middle and a first annular protrusion structure disposed on the outer side of the bottom of the alloy connecting end, the end of the first columnar protrusion structure expands outward and the end of the first annular protrusion structure contracts inward, and / or, the protruding structure of the steel connecting end includes a second columnar protrusion structure disposed in the middle and a second annular protrusion structure disposed on the outer side of the top of the steel connecting end, the end of the second columnar protrusion structure expands outward and the end of the second annular protrusion structure contracts inward.

[0007] Preferably, at least one of the first and second columnar protrusion structures has an enlarged region at its end; preferably, the enlarged region is inverted trapezoidal, spherical, disc-shaped, or mushroom-shaped.

[0008] Preferably, the connector is integrally cast between the alloy tooth and the steel base. Preferably, the alloy tooth is made of cemented carbide, ceramic, or special alloy steel, and the connector is made of stainless steel, high manganese steel, cast iron, copper alloy, titanium alloy, or aluminum alloy.

[0009] Preferably, the protruding structure surface of at least one of the alloy tooth and the steel base is covered with a bonding film layer, the bonding film layer being made of a material that is the same as or compatible with the connector; preferably, the protruding structure surface of at least one of the alloy tooth and the steel base is covered with a mixture of one or more of Fe, W, Ni, Mo or Ti.

[0010] Preferably, the outer side of the main body of the connector is provided with a connecting material surface layer, which is a coating layer made of one or more of stainless steel, high manganese steel, cast iron, copper alloy, titanium alloy or aluminum alloy and ZTA, alumina, cemented carbide, silicon carbide or silicon nitride.

[0011] Beneficial effects

[0012] This invention proposes a connector between cemented carbide and steel and its preparation method. The connector of this invention is simple and reasonably designed. This structure not only ensures a tight bond between the alloy head and the steel base, but also combines the high hardness and high wear resistance of cemented carbide with the toughness and strength of steel. It can provide excellent working performance and long service life under extreme working conditions, reduce the frequency of replacement, and is suitable for various high-intensity working environments.

[0013] Furthermore, in the preferred implementation, this invention incorporates an enhanced design:

[0014] The double-locking connection method, specifically taking the connection between the steel base and the connector as an example, involves a second columnar protrusion in the middle and a second annular protrusion on the outer side of the steel base. The side edges of the second protrusion in the middle exhibit an expanding trend, which can be gradually expanding or gradient expanding, extending outwards towards the alloy tooth. An annular protrusion is provided on the outer side of the connecting end of the steel base, contracting inwards towards the alloy tooth. Thus, after the connecting material is cast... The connecting material will extend into the embedded area enclosed by the second columnar protrusion structure and the second annular protrusion structure. When the cutting tooth and the connecting body are subjected to force transmitted to the base, if the cutting tooth and the connecting body tend to detach from the connecting structure, due to the bulging area (disc structure) at the end of the second columnar protrusion structure, the part of the connecting structure extending into the steel base between the second columnar protrusion structure and the annular protrusion will have an expansion tendency. The annular protrusion, due to its inward contraction, just suppresses this expansion tendency, making the fixing effect between the two better.

[0015] More preferably, a bonding film layer is added to the casting surface of the bonding structure, so that the bonding structure can be better bonded to the alloy tooth. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the connection structure in Embodiment 1 of this utility model.

[0017] Figure 2 for Figure 1 This is a schematic diagram of the disassembled connection structure of Embodiment 1 of this utility model.

[0018] Figure 3 A physical diagram of the steel base in one implementation of this utility model.

[0019] Figure 4 This is a physical diagram of an embodiment of the present invention in which the alloy tooth is placed on a steel base.

[0020] Figure 5-11 This is a schematic diagram of the connection structure of different embodiments of the present invention.

[0021] Reference numerals: 11. Connecting material surface layer, 12. Alloy tooth head, 13. Connecting material, 14. Steel base. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.

[0023] This invention proposes a bonding structure between cemented carbide and steel and a method for its preparation.

[0024] Example 1

[0025] like Figure 1 As shown, the connecting structure of this utility model includes an alloy tooth (in this embodiment, hard alloy is used), a steel base, and a connecting body. The alloy tooth includes two parts: an upper part and a lower part. The upper part is mushroom-shaped and is called the working end. The lower part is an inverted trapezoidal protrusion. It is called an inverted trapezoid because the diameter of the end of the protrusion is larger than the diameter of the middle part. That is, in this embodiment, it adopts a columnar structure with a trapezoidal cross-section (longitudinal cross-section). The diameter of the columnar structure gradually increases from the part connected to the working end to the end.

[0026] The steel base includes the base body ( Figure 1 (lower part) and steel connection end ( Figure 1The upper part of the base (facing the alloy tooth head). The base body adapts its structure according to the installation scenario of the alloy tooth head. The main body of the steel base generally adopts a structure with a frustum at the top and a cylinder at the bottom. In this embodiment, the steel connection end includes two parts: a columnar protrusion structure in the middle and an annular protrusion on the outside. The lower part of the columnar protrusion structure is columnar and the upper part is disc-shaped. The side edge of the middle protrusion structure has a gradually changing or stepped structure, extending outwards closer to the alloy tooth head. Conversely, the annular protrusion contracts inwards closer to the alloy tooth head. In this way, after the connecting material is cast between the alloy tooth head and the steel base, the middle protrusion structure and the outer annular protrusion will tightly lock the connecting part cast between the two.

[0027] The connector is geometrically interlocked with the alloy tooth head and the steel base respectively.

[0028] The alloy tooth of this invention uses materials including, but not limited to, one or a mixture of several of the following: cemented carbide, ceramic materials, high-manganese steel, and high-chromium steel. The steel base of this invention uses materials including, but not limited to, one or a mixture of several of the following: low-carbon steel and ductile iron. The connector of this invention uses materials that are elemental or alloyed, including but not limited to, stainless steel, high-manganese steel, cast iron, copper alloys, titanium alloys, or aluminum alloys, and the bonding film material is one of the following: Fe, W, Ni, Mo, or Ti.

[0029] In addition, the material used for the surface layer of the connector can be a composite material, including but not limited to alloy and particle composite materials, such as high-chromium cast iron and silicon carbide particles, high-manganese steel and alumina particles, alloy steel and cemented carbide particles, stainless steel and ZTA particles, aluminum alloy and silicon carbide particles, etc.

[0030] The fabrication process of the connection structure in this embodiment is as follows:

[0031] 1. Preparation of alloy tooth tips

[0032] According to the design dimensions, the appropriate material is selected and processed into alloy teeth. In this embodiment, the cutting tooth is taken as an example. Therefore, the alloy tooth is a mushroom-shaped cutting tooth made of cemented carbide.

[0033] The alloy connecting end includes a first columnar protrusion structure located in the middle and a first annular protrusion structure located on the outer side of the bottom of the alloy connecting end. The end of the first columnar protrusion structure expands outward, while the end of the first annular protrusion structure contracts inward. Thus, after the connecting material is cast, the connecting material will extend into the embedded area enclosed by the first columnar protrusion structure and the first annular protrusion structure. When the cutting tooth is subjected to force transmitted to the connecting material, if the cutting tooth tends to detach from the connecting structure, since the cross-section of the end of the first columnar protrusion structure is inverted trapezoidal, the part of the connecting structure extending into the part between the first columnar protrusion structure and the annular protrusion of the cutting tooth will have an expansion tendency. However, the annular protrusion, due to its inward contraction, just suppresses this expansion tendency, resulting in a better fixing effect between the two.

[0034] Those skilled in the art should understand that alloy tooth materials include, but are not limited to, one or a mixture of several of cemented carbide, ceramic materials, high-manganese steel, and high-chromium steel.

[0035] 2. Preparation of steel base

[0036] According to the design dimensions, the appropriate material is selected and processed into a steel base. In this embodiment, the cutting tooth is still taken as an example. The steel base adopts a structure that matches the shape of the conventional cutting tooth base, with a cylindrical bottom and a frustum-shaped top.

[0037] It is important to note that during the fabrication of the steel base, the steel base should have a protruding structure with a gradually increasing diameter at least in the middle. That is, the end of the protruding structure should have an outwardly expanding region in the shape of a disc, spherical crown, or mushroom head, which can also be called an enlarged portion. The side edges of the second protruding structure in the middle should have an expanding trend, which can be gradually expanding or gradient expanding, extending outwards more towards the side closer to the alloy tooth.

[0038] Preferably, when casting or forging the steel base, an annular protrusion is provided on the outer side of the connecting end of the steel base. In contrast to the second protrusion in the center, the second annular protrusion tapers inwards towards the alloy tooth tip.

[0039] In this way, after the connecting material is cast, it will extend into the embedded area formed by the second columnar protrusion structure and the second annular protrusion structure. When the cutting tooth and the connecting body are subjected to force transmitted to the base, if the cutting tooth and the connecting body tend to detach from the connecting structure, due to the bulging area (disc structure) at the end of the second columnar protrusion structure, the part of the connecting structure extending into the steel base between the second columnar protrusion structure and the annular protrusion will have an expansion tendency. The annular protrusion, due to its inward contraction, just suppresses this expansion tendency, making the fixing effect between the two better.

[0040] The base material of this utility model includes, but is not limited to, one or a mixture of several of the following: low carbon steel, ductile iron, 40MnB, and 30CrMnSi.

[0041] 3. Connection between tooth head and base

[0042] The alloy tooth and steel base are placed into the mold according to the designed positions for assembly. In this embodiment, only the example of assembling them facing each other and arranged vertically is described. As shown in the figure, the steel base is placed at the bottom with the connecting end facing upwards, and the connecting end of the carbide tooth faces the steel base. Preferably, the tooth is fixed from the top or a spacer of the same material as the connecting material is placed between them to maintain a certain distance. Molten or semi-molten connecting material is poured into the mold between them, and after solidification, the connection between the tooth and the steel base is achieved. The semi-molten part mentioned here refers to the material not reaching the degree of complete melting, but the hardness has been significantly reduced. The roughly shaped connecting material is placed between the tooth and the steel base, and the connecting material is squeezed into the gap between the tooth and the steel base by external force, and then further shaped.

[0043] Preferably, the melting point of the connecting material is lower than that of the materials of the steel base and the cutting tooth.

[0044] The surface of the bonding material can be a composite material, including but not limited to alloy and particle composite materials, such as high-chromium cast iron and silicon carbide particles, high-manganese steel and alumina particles, alloy steel and cemented carbide particles, stainless steel and ZTA particles, aluminum alloy and silicon carbide particles, etc.

[0045] In a preferred embodiment, a bonding film layer is added to the surface of the alloy tooth tip. The bonding film layer is composed of Fe, W, Ni, Mo, or Ti. This film layer can be deposited using a vacuum evaporation chamber or other methods. The coating allows the bonding material to better bond with the alloy tooth tip during subsequent bonding processes, increasing the bonding strength.

[0046] The functions of each part in this utility model:

[0047] 1. Alloy tooth tips: Used for high-strength and wear-resistant cutting operations.

[0048] 2. Connecting material: Used for transitional connection between alloy tooth head and steel base.

[0049] 3. Steel base: Used for support and shock absorption.

[0050] 4. Connecting material surface layer: Used to protect the connecting material and improve wear resistance. The thickness of the surface layer is 0.01-100mm. It is necessary that the connecting material surface layer is formed on the surface of the connecting material after the entire structure is completed. The aforementioned connecting film layer is formed by vapor deposition on the surface of the alloy tooth head, especially at the connecting end of the alloy tooth head, before the alloy tooth head is bonded to the connecting material.

[0051] Example 2

[0052] Figure 5 This is a schematic diagram of a structural variant of the connection structure of this utility model. In this embodiment, the three parts of the connection structure—the alloy tooth head, the steel base, and the connecting body—have rectangular cross-sections. Correspondingly, the cross-sections of the protrusions in the middle of the alloy tooth head and the steel base are also rectangular. The outer annular protrusions of both are rectangular rings instead of circular rings to accommodate this type of connection structure. The structure of the connecting body is also adaptively adjusted because it is formed by casting.

[0053] Example 3

[0054] Figure 6 This is a variant of Example 1, wherein the steel base structure is the same as in Example 1, except that the alloy tooth head differs from that in Example 1. The protruding structure in the middle of the alloy tooth head in Example 1 is omitted, and only the outer annular protrusion is retained. The structure of the connector is also adaptively adjusted because it is formed by casting.

[0055] Example 4

[0056] Figure 7 This is a variant of Example 1, wherein the steel base structure is the same as in Example 1, except that the alloy tooth head is different from that in Example 1. The protruding structure in the middle of the alloy tooth head in Example 1 is omitted, and only the outer annular protrusion is retained. Furthermore, the shape of the hollow region in the middle is adjusted relative to Example 3. The structure of the connector is also adapted because it is formed by casting.

[0057] Example 5

[0058] Figure 8 This is another variation of Example 1, in which the steel base structure is the same as in Example 1, except that the alloy tooth head is different. The cross-sectional shape of the alloy tooth head has been adjusted relative to Example 1, and the inner edge of the outer annular protrusion forms a barb shape. The structure of the connector, being cast, has also been adapted accordingly.

[0059] Example 6

[0060] Figure 9This is another variation of Example 1, in which the steel base structure is the same as in Example 1, except that the alloy tooth head is different from that in Example 1, and the cross-sectional shape of the alloy tooth head has been adjusted relative to Example 1. The structure of the connector, being cast, has also been adapted accordingly.

[0061] Example 7

[0062] Figure 10 This is another variant of Example 1, wherein the alloy tooth structure is the same as that of Example 1 or adopts the structure in Examples 3-6, and the cross-sectional shape of the steel base is adjusted.

[0063] Example 8

[0064] Figure 11 This is another variant of Example 2, in which the alloy tooth structure is the same as in Example 2, but the cross-sectional shape of the steel base is adjusted.

[0065] Application examples:

[0066] This connection structure, consisting of alloy tooth tips, connecting materials, and a steel base, has the following typical applications:

[0067] 1. Mining and Tunneling: Highly wear-resistant tool parts used in mining and tunneling equipment, such as cutting teeth, drill bits, and tunneling teeth.

[0068] 2. Machining: Used to manufacture cutting tool parts that require high wear resistance, such as milling cutters and turning tools.

[0069] 3. Construction Engineering: High-stress, high-wear components used in construction machinery, such as crushers and bucket teeth.

[0070] Although the principles of this utility model have been described in detail above with reference to preferred embodiments, those skilled in the art should understand that the above embodiments are merely illustrative explanations of the implementation of this utility model and are not intended to limit the scope of this utility model. The details in the embodiments do not constitute a limitation on the scope of this utility model. Any obvious changes, such as equivalent transformations or simple substitutions, based on the technical solution of this utility model without departing from its spirit and scope fall within the protection scope of this utility model.

Claims

1. A bonding structure between cemented carbide and steel, characterized in that, The connection structure includes: The device comprises an alloy tooth tip, a steel base, and a connector. The alloy tooth tip includes a working end and an alloy connecting end. The steel base includes a base body and a steel connecting end. The alloy connecting end and the steel connecting end have protruding structures. The connector has recessed areas that match the shapes of the alloy connecting end and the steel connecting end. The alloy connecting end and the steel connecting end are respectively embedded in the recessed areas of the connector.

2. The cemented carbide-steel bonding structure according to claim 1, characterized in that, The protruding structure of the alloy connecting end includes a first columnar protrusion structure disposed in the middle and a first annular protrusion structure disposed on the outer side of the bottom of the alloy connecting end. The end of the first columnar protrusion structure expands outward and the end of the first annular protrusion structure contracts inward. And / or, the protruding structure of the steel connecting end includes a second columnar protrusion structure disposed in the middle and a second annular protrusion structure disposed on the outer side of the top of the steel connecting end. The end of the second columnar protrusion structure expands outward and the end of the second annular protrusion structure contracts inward.

3. The cemented carbide-steel bonding structure according to claim 2, characterized in that, At least one of the first columnar protrusion structure and the second columnar protrusion structure has an enlarged region at its end.

4. The cemented carbide-steel bonding structure according to claim 3, characterized in that, The enlarged region is in the shape of an inverted trapezoid, a spherical crown, or a disc.

5. The cemented carbide-steel bonding structure according to claim 1, characterized in that, The connector is integrally cast between the alloy tooth and the steel base.

6. The cemented carbide-steel bonding structure according to claim 1, characterized in that, The alloy teeth are made of cemented carbide, ceramic, or special alloy steel, and the connecting body is made of stainless steel, high manganese steel, cast iron, copper alloy, titanium alloy, or aluminum alloy.

7. The cemented carbide-steel bonding structure according to claim 6, characterized in that, At least one of the alloy tooth head and the steel base has a protruding structure surface covered with a bonding film layer, the bonding film layer being made of a material that is the same as or compatible with the connector.

8. The cemented carbide-steel bonding structure according to claim 6, characterized in that, The outer side of the main body of the connector is provided with a connecting material surface layer.

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