An assembled wear-resistant hammer head and a preparation method thereof

Abstract

The present invention discloses an assembled wear-resistant hammer head and a preparation method thereof. The assembled wear-resistant hammer head includes a hammer handle, a pressing block, and cemented carbide rods. A plurality of the cemented carbide rods are included and are all installed in the counterbores of the pressing block. The whole pressing block is fixedly connected to the bottom of the hammer handle. The cemented carbide rods are sintered in vacuum to form cemented carbide. One end face of the cemented carbide rod is provided with a boss. The components in the cemented carbide rod are as follows: TiC: 88-90 wt.%, B2C: 1-1.5 wt.%, and the balance is Fe-Ni alloy, wherein the Ni content is 12 wt.%.

Description

Technical Field

[0001] The invention relates to a wear-resistant hammer head, in particular to an assembled wear-resistant hammer head and a preparation method thereof. Background Art

[0002] The hammer of a crusher is a kind of wear-resistant structural material used under the working conditions of contact friction and wear of hard materials with strong impact. It is a vulnerable part with fast wear and high consumption. Because of the frequent and troublesome replacement of hammers, there are many materials and methods for manufacturing composite hammers, but there is no method for manufacturing composite wear-resistant hammers by high-temperature cast cemented carbide.

[0003] At present, the materials of hammer heads used in the crusher industry are roughly high manganese steel, high chromium cast iron and low alloy wear-resistant steel. The high manganese steel hammer head has good toughness and is not easy to break during the hammering and impact process. Although it has a work hardening effect, its hardness is very low and its wear resistance is extremely poor. In order to improve the wear resistance and extend the service life, people have cast steel-bonded carbide rods or blocks and other hard materials on the working surface of the hammer head to form a composite wear-resistant part. At the same time, there is also a method of using low alloy steel for the hammer handle and high manganese steel for casting carbide or high chromium cast iron for the hammer head; there is also a method of prefabricating the hammer handle, pre-embedding the cast alloy in the hammer handle and the hammer head, and then pouring the hammer head steel liquid into the composite hammer head. In these casting methods, the mold cavity is nothing more than a sand mold, a resin sand mold and a lost model. The advantage of these mold cavities is that it is convenient to pre-embed alloy rods or blocks and hammer handles, but its casting quality is difficult to guarantee. Because it is cold iron casting, when factors such as molten steel temperature and pouring speed do not match, the cold alloy rod or hammer handle is equivalent to the nucleus of molten steel nucleation, causing the molten steel to condense and crystallize quickly, hindering the flow of molten steel, and causing holes and cold shuts around the alloy rod or hammer handle, resulting in the scrapping of the casting. If the defect is invisible to the inner eye, when the base of the hammer head is worn during operation, the carbide block or hammer handle will fall off, which will not only affect the service life but also cause great economic losses to the user, damage the crusher, cause shutdown and production, and compensate the customer for the loss. It is also common.

[0004] As a vulnerable component of the impact crusher, the wear resistance and service life of the hammer directly determine the crushing efficiency and economic benefits of the crusher. At present, most of the hammers are made of high-chromium cast iron, high-manganese steel and other materials, but they have disadvantages such as short service life and insufficient wear resistance. In particular, the hammer made of pure high-chromium cast iron is brittle and has the risk of breaking under high impact loads. As a result, the crushing quality of the crusher is reduced, which indirectly causes an increase in costs. Summary of the invention

[0005] Purpose of the invention: The purpose of the present invention is to solve the deficiencies in the prior art and to provide an assembled wear-resistant hammer head and a preparation method thereof.

[0006] Technical solution: The assembled wear-resistant hammer head described in the present invention comprises a hammer handle, a clamping block, and a cemented carbide rod. The cemented carbide rod comprises a plurality of cemented carbide rods, and all of the cemented carbide rods are installed in the countersunk holes of the clamping block. The clamping block is integrally fixedly connected to the hammer handle. The cemented carbide rod is a rigid cemented carbide formed by vacuum sintering, and a boss is provided on one end surface of the cemented carbide rod.

[0007] The composition of the cemented carbide rod is: TiC: 88-90wt.%, B2C: 1-1.5wt.%, and the balance is Fe-Ni alloy, wherein the Ni content is 12wt.%.

[0008] Furthermore, the cross-section of the cemented carbide rod is circular and has a diameter of 10 to 15 mm.

[0009] Furthermore, the clamping block adopts a "U"-shaped structure, and its shape is consistent with the bottom of the hammer handle. A plurality of countersunk holes are provided in the clamping block for installing the cemented carbide rod.

[0010] Furthermore, the pressing block is made of high chromium cast iron.

[0011] Furthermore, the ratio of the diameter of the cemented carbide rod to the wall thickness of the mesh metal matrix processed by the pressing block is 3:1 to 1.5:1.

[0012] Furthermore, the cemented carbide rod and the pressing block are in transition fit.

[0013] Furthermore, the clamping block as a whole is fixedly connected to the bottom of the hammer handle via a fixing screw.

[0014] The present invention also discloses a method for preparing the above-mentioned assembled wear-resistant hammer head, comprising the following steps:

[0015] Preparation of cemented carbide rods: The cemented carbide rods were prepared by vacuum sintering process, the above weight of powder was weighed, the particle size of the powder was 1200 mesh, and a planetary ball mill was used for wet grinding for 4-5 hours, and the rotation speed was 120-150 rpm; the sintering curve was as follows: heating to 300° at 50° / h, and keeping warm for 1.5 hours; heating to 720° at 30° / h, and keeping warm for 2 hours; heating to 1100° at 30° / h, and keeping warm for 2.5 hours; heating to 1350° at 20° / h, and keeping warm for 1 hour; then cooling to 830° at 25° / h, and keeping warm for 1.5 hours; then cooling to room temperature with the furnace;

[0016] The hammer handle is made of ordinary low carbon steel by sand casting or lost foam casting;

[0017] The specific assembly operations are:

[0018] (1) The pressing block is heated to 200-250°C, and then the cemented carbide rods are inserted into the holes in sequence at this temperature; after cooling to room temperature, a transition fit is formed between the cemented carbide column and the pressing block;

[0019] (2) Then install the assembly of the clamping block and the carbide rod along the groove slide of the hammer handle and fix it with bolts.

[0020] Beneficial effects: The beneficial effects of the present invention are as follows:

[0021] (1) The B2C in the cemented carbide rod of the present invention plays a "pinning" role in the cemented carbide. On the one hand, it is evenly dispersed between the TiC particles to increase the overall toughness of the cemented carbide. On the other hand, it fuses with the Fe-Ni alloy at high temperature to increase the hardness and wear resistance of the bonding phase.

[0022] (2) The reasonable distribution of the diameter of the carbide rod and the wall thickness of the mesh metal matrix processed by the clamping block can serve as the main wear-resistant medium in the striking direction. It is not only highly impact-resistant but also not prone to breakage. At the same time, under the protection of the side of the carbide column, the clamping block will not fail due to excessive wear, nor will it break due to repeated impact of the material.

[0023] (2) A boss is provided on one end face of the cemented carbide rod of the present invention, which has the advantages of preventing the cemented carbide rod from falling off under repeated vibration, and secondly increasing the contact area between the cemented carbide and the hammer handle, thereby dispersing the stress generated by the impact of the material;

[0024] (3) The preparation process of the present invention can save costs and improve the impact resistance of the hammer head as a whole, and will not cause the hammer head to break due to material impact, which will affect production and use; the clamping block is made of high-chromium cast iron material through lost foam casting; the holes arranged in a mesh pattern are preset in the lost foam to facilitate the subsequent assembly of cemented carbide;

[0025] (4) The present invention uses TiC cemented carbide as the main wear-resistant medium to increase the wear resistance of the hammer head, thereby increasing the service life;

[0026] (5) The present invention increases the impact resistance of the hammer head as a whole, preventing it from breaking during use;

[0027] (6) The present invention is convenient for disassembly and assembly, saves costs, reduces energy consumption of production enterprises, and achieves the purpose of energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A structural cross-sectional view of an embodiment of the present invention;

[0029] Figure 2 for Figure 1 Side view of. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "inside" and "outside" are the directions or positional relationships shown, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The present invention is further described in detail below through specific implementation examples in conjunction with the accompanying drawings.

[0034] Example 1

[0035] like Figure 1 and Figure 2 As shown, an assembled wear-resistant hammer head includes a hammer handle 1, a pressing block 2, and a cemented carbide rod 3. The cemented carbide rod 3 includes a plurality of cemented carbide rods, and all are installed in the countersunk holes of the pressing block 2. The pressing block 2 is integrally fixedly connected to the hammer handle 1. The cemented carbide rod 3 is a rigid cemented carbide formed by vacuum sintering, and a boss 4 is provided on one end surface of the cemented carbide rod 3.

[0036] The composition of the cemented carbide rod 3 is: TiC: 88wt.%, B2C: 1wt.%, and the balance is Fe-Ni alloy, wherein the Ni content is 12wt.%.

[0037] Example 2

[0038] like Figure 1 and Figure 2As shown, an assembled wear-resistant hammer head includes a hammer handle 1, a pressing block 2, and a cemented carbide rod 3. The cemented carbide rod 3 includes a plurality of cemented carbide rods, and all are installed in the countersunk holes of the pressing block 2. The pressing block 2 is integrally fixedly connected to the hammer handle 1. The cemented carbide rod 3 is a rigid cemented carbide formed by vacuum sintering, and a boss 4 is provided on one end surface of the cemented carbide rod 3.

[0039] The composition of the cemented carbide rod 3 is: TiC: 88.5wt.%, B2C: 1.2wt.%, and the balance is Fe-Ni alloy, wherein the Ni content is 12wt.%.

[0040] In this embodiment, the cross-section of the cemented carbide rod is circular, and the diameter is 10-15 mm.

[0041] In this embodiment, Figure 1 As shown, the clamping block 2 adopts a "U"-shaped structure, and its shape is consistent with the bottom of the hammer handle. A plurality of countersunk holes are provided in the clamping block 2 for installing the cemented carbide rod 3.

[0042] In this embodiment, the pressing block is preferably made of high chromium cast iron.

[0043] In this embodiment, the ratio of the diameter of the cemented carbide rod 3 to the wall thickness of the mesh metal matrix processed by the clamping block 2 is 3:1~1.5:1. The cemented carbide rod 3 is prepared by vacuum sintering, and its diameter is 10~15mm. Preferably, the cemented carbide diameter is 13mm, and the wall thickness of the clamping block matrix is ​​7.5mm, so that the cemented carbide column can be used as the main wear-resistant medium in the striking direction, which is not only highly impact-resistant, but also not prone to fracture; at the same time, under the side protection of the cemented carbide column, the clamping block will not fail due to excessive wear, nor will it break due to repeated impact of the material.

[0044] In this embodiment, preferably, the cemented carbide rod and the pressing block are in transition fit.

[0045] In this embodiment, Figure 2 As shown, the clamping block 2 is integrally fixedly connected to the bottom of the hammer handle 1 via a fixing screw 5 .

[0046] The method for preparing the above-mentioned assembled wear-resistant hammer head comprises the following steps:

[0047] Preparation of cemented carbide rods: The cemented carbide rods were prepared by vacuum sintering process, the above weight of powder was weighed, the powder particle size was 1200 mesh, and a planetary ball mill was used for wet grinding for 4 hours at a speed of 120 rpm; the sintering curve was as follows: heating to 300° at 50° / h, keeping warm for 1.5 hours; heating to 720° at 30° / h, keeping warm for 2 hours; heating to 1100° at 30° / h, keeping warm for 2.5 hours; heating to 1350° at 20° / h, keeping warm for 1 hour; then cooling to 830° at 25° / h, keeping warm for 1.5 hours; then cooling to room temperature with the furnace;

[0048] The hammer handle is made of ordinary low-carbon steel through sand casting or lost foam casting; its main purpose is to save costs and improve the overall impact resistance of the hammer head, so that the hammer head will not break due to material impact, affecting production and use; the clamping block is made of high-chromium cast iron through lost foam casting. Preferably, BTMCr26 is used. Holes arranged in a mesh are preset in the lost foam to facilitate the subsequent assembly of cemented carbide.

[0049] The specific assembly operations are:

[0050] (1) The pressing block is heated to 200°C, and then the cemented carbide rods are inserted into the holes in sequence at this temperature; after cooling to room temperature, a transition fit is formed between the cemented carbide column and the pressing block;

[0051] (2) Then install the assembly of the clamping block and the carbide rod along the groove slide of the hammer handle and fix it with bolts.

[0052] Example 3

[0053] like Figure 1 and Figure 2 As shown, an assembled wear-resistant hammer head includes a hammer handle 1, a pressing block 2, and a cemented carbide rod 3. The cemented carbide rod 3 includes a plurality of cemented carbide rods, and all are installed in the countersunk holes of the pressing block 2. The pressing block 2 is integrally fixedly connected to the hammer handle 1. The cemented carbide rod 3 is a rigid cemented carbide formed by vacuum sintering, and a boss 4 is provided on one end surface of the cemented carbide rod 3.

[0054] The composition of the cemented carbide rod 3 is: TiC: 88.5wt.%, B2C: 1.3wt.%, and the balance is Fe-Ni alloy, wherein the Ni content is 12wt.%.

[0055] In this embodiment, the cross-section of the cemented carbide rod is circular, and the diameter is 10-15 mm.

[0056] In this embodiment, Figure 1 As shown, the clamping block adopts a "U"-shaped structure, and its shape is consistent with the bottom of the hammer handle. A plurality of countersunk holes are provided in the clamping block for installing the cemented carbide rod.

[0057] In this embodiment, the pressing block is made of high chromium cast iron.

[0058] In this embodiment, the ratio of the diameter of the cemented carbide rod to the wall thickness of the mesh metal matrix processed by the clamping block is 3:1~1.5:1. The cemented carbide rod 3 is prepared by vacuum sintering, and its diameter is 10~15mm. Preferably, the cemented carbide diameter is 13mm, and the wall thickness of the clamping block matrix is ​​7.5mm, so that the cemented carbide column can be used as the main wear-resistant medium in the striking direction, which is not only highly impact-resistant, but also not prone to fracture; at the same time, under the side protection of the cemented carbide column, the clamping block will not fail due to excessive wear, nor will it break due to repeated impact of the material.

[0059] In this embodiment, the cemented carbide rod and the pressing block are in transition fit.

[0060] In this embodiment, Figure 2 As shown, the clamping block is integrally fixedly connected to the bottom of the hammer handle via a fixing screw 5.

[0061] The method for preparing the above-mentioned assembled wear-resistant hammer head comprises the following steps:

[0062] Preparation of cemented carbide rods: The cemented carbide rods were prepared by vacuum sintering process. The powders of the above weight were weighed, and the particle size of the powders was 1200 mesh. The powders were wet-milled for 4.5 hours using a planetary ball mill at a speed of 135 rpm. The sintering curve was as follows: heating to 300° at 50° / h, and keeping warm for 1.5 hours; heating to 720° at 30° / h, and keeping warm for 2 hours; heating to 1100° at 30° / h, and keeping warm for 2.5 hours; heating to 1350° at 20° / h, and keeping warm for 1 hour; then cooling to 830° at 25° / h, and keeping warm for 1.5 hours; then cooling to room temperature with the furnace;

[0063] The hammer handle is made of ordinary low-carbon steel through sand casting or lost foam casting; its main purpose is to save costs and improve the overall impact resistance of the hammer head, so that the hammer head will not break due to material impact, affecting production and use; the clamping block is made of high-chromium cast iron through lost foam casting. Preferably, BTMCr26 is used. Holes arranged in a mesh are preset in the lost foam to facilitate the subsequent assembly of cemented carbide.

[0064] The specific assembly operations are:

[0065] (1) The pressing block is heated to 210°C, and then the cemented carbide rods are inserted into the holes in sequence at this temperature; after cooling to room temperature, a transition fit is formed between the cemented carbide column and the pressing block;

[0066] (2) Then install the assembly of the clamping block and the carbide rod along the groove slide of the hammer handle and fix it with bolts.

[0067] Example 4

[0068] like Figure 1 and Figure 2 As shown, an assembled wear-resistant hammer head includes a hammer handle 1, a pressing block 2, and a cemented carbide rod 3. The cemented carbide rod 3 includes a plurality of cemented carbide rods, and all are installed in the countersunk holes of the pressing block 2. The pressing block 2 is integrally fixedly connected to the hammer handle 1. The cemented carbide rod 3 is a rigid cemented carbide formed by vacuum sintering, and a boss 4 is provided on one end surface of the cemented carbide rod 3.

[0069] The composition of the cemented carbide rod 3 is: TiC: 88.8wt.%, B2C: 1.4wt.%, and the remainder is Fe-Ni alloy, wherein the Ni content is 12wt.%.

[0070] In this embodiment, the cross-section of the cemented carbide rod is circular, and the diameter is 10-15 mm.

[0071] In this embodiment, Figure 1 As shown, the clamping block 2 adopts a "U"-shaped structure, and its shape is consistent with the bottom of the hammer handle. A plurality of countersunk holes are provided in the clamping block 2 for installing the cemented carbide rod 3.

[0072] In this embodiment, the pressing block is preferably made of high chromium cast iron.

[0073] In this embodiment, the ratio of the diameter of the cemented carbide rod 3 to the wall thickness of the mesh metal matrix processed by the clamping block 2 is 3:1~1.5:1. The cemented carbide rod 3 is prepared by vacuum sintering, and its diameter is 10~15mm. Preferably, the cemented carbide diameter is 13mm, and the wall thickness of the clamping block matrix is ​​7.5mm, so that the cemented carbide column can be used as the main wear-resistant medium in the striking direction, which is not only highly impact-resistant, but also not prone to fracture; at the same time, under the side protection of the cemented carbide column, the clamping block will not fail due to excessive wear, nor will it break due to repeated impact of the material.

[0074] In this embodiment, preferably, the cemented carbide rod and the pressing block are in transition fit.

[0075] In this embodiment, Figure 2 As shown, the clamping block 2 is integrally fixedly connected to the bottom of the hammer handle 1 via a fixing screw 5 .

[0076] The method for preparing the above-mentioned assembled wear-resistant hammer head comprises the following steps:

[0077] Preparation of cemented carbide rods: The cemented carbide rods were prepared by vacuum sintering process. The powders of the above weight were weighed, and the particle size of the powders was 1200 mesh. The powders were wet-milled for 4.6 hours using a planetary ball mill at a speed of 140 rpm. The sintering curve was as follows: heating to 300° at 50° / h, and keeping warm for 1.5 hours; heating to 720° at 30° / h, and keeping warm for 2 hours; heating to 1100° at 30° / h, and keeping warm for 2.5 hours; heating to 1350° at 20° / h, and keeping warm for 1 hour; then cooling to 830° at 25° / h, and keeping warm for 1.5 hours; then cooling to room temperature with the furnace;

[0078] The hammer handle is made of ordinary low-carbon steel through sand casting or lost foam casting; its main purpose is to save costs and improve the overall impact resistance of the hammer head, so that the hammer head will not break due to material impact, affecting production and use; the clamping block is made of high-chromium cast iron through lost foam casting. Preferably, BTMCr26 is used. Holes arranged in a mesh are preset in the lost foam to facilitate the subsequent assembly of cemented carbide.

[0079] The specific assembly operations are:

[0080] (1) The pressing block is heated to 240°C, and then the cemented carbide rods are inserted into the holes in sequence at this temperature; after cooling to room temperature, a transition fit is formed between the cemented carbide column and the pressing block;

[0081] (2) Then install the assembly of the clamping block and the carbide rod along the groove slide of the hammer handle and fix it with bolts.

[0082] Example 5

[0083] like Figure 1 and Figure 2 As shown, an assembled wear-resistant hammer head includes a hammer handle 1, a pressing block 2, and a cemented carbide rod 3. The cemented carbide rod 3 includes a plurality of cemented carbide rods, and all are installed in the countersunk holes of the pressing block 2. The pressing block 2 is integrally fixedly connected to the hammer handle 1. The cemented carbide rod 3 is a rigid cemented carbide formed by vacuum sintering, and a boss 4 is provided on one end surface of the cemented carbide rod 3.

[0084] The composition of the cemented carbide rod 3 is: TiC: 90wt.%, B2C: 1.5wt.%, and the balance is Fe-Ni alloy, wherein the Ni content is 12wt.%.

[0085] In this embodiment, the cross-section of the cemented carbide rod is circular, and the diameter is 10-15 mm.

[0086] In this embodiment, Figure 1 As shown, the clamping block 2 adopts a "U"-shaped structure, and its shape is consistent with the bottom of the hammer handle. A plurality of countersunk holes are provided in the clamping block 2 for installing the cemented carbide rod 3.

[0087] In this embodiment, the pressing block is preferably made of high chromium cast iron.

[0088] In this embodiment, the ratio of the diameter of the cemented carbide rod 3 to the wall thickness of the mesh metal matrix processed by the clamping block 2 is 3:1~1.5:1. The cemented carbide rod 3 is prepared by vacuum sintering, and its diameter is 10~15mm. Preferably, the cemented carbide diameter is 13mm, and the wall thickness of the clamping block matrix is ​​7.5mm, so that the cemented carbide column can be used as the main wear-resistant medium in the striking direction, which is not only highly impact-resistant, but also not prone to fracture; at the same time, under the side protection of the cemented carbide column, the clamping block will not fail due to excessive wear, nor will it break due to repeated impact of the material.

[0089] In this embodiment, preferably, the cemented carbide rod and the pressing block are in transition fit.

[0090] In this embodiment, Figure 2 As shown, the clamping block 2 is integrally fixedly connected to the bottom of the hammer handle 1 via a fixing screw 5 .

[0091] The method for preparing the above-mentioned assembled wear-resistant hammer head comprises the following steps:

[0092] Preparation of cemented carbide rods: The cemented carbide rods were prepared by vacuum sintering process. The powders of the above weight were weighed, and the particle size of the powders was 1200 mesh. The powders were wet-milled for 5 hours using a planetary ball mill at a speed of 150 rpm. The sintering curve was as follows: heating to 300° at 50° / h, and keeping warm for 1.5 hours; heating to 720° at 30° / h, and keeping warm for 2 hours; heating to 1100° at 30° / h, and keeping warm for 2.5 hours; heating to 1350° at 20° / h, and keeping warm for 1 hour; then cooling to 830° at 25° / h, and keeping warm for 1.5 hours; then cooling to room temperature with the furnace;

[0093] The hammer handle is made of ordinary low-carbon steel through sand casting or lost foam casting; its main purpose is to save costs and improve the overall impact resistance of the hammer head, so that the hammer head will not break due to material impact, affecting production and use; the clamping block is made of high-chromium cast iron through lost foam casting. Preferably, BTMCr26 is used. Holes arranged in a mesh are preset in the lost foam to facilitate the subsequent assembly of cemented carbide.

[0094] The specific assembly operations are:

[0095] (1) The pressing block is heated to 250°C, and then the cemented carbide rods are inserted into the holes in sequence at this temperature; after cooling to room temperature, a transition fit is formed between the cemented carbide column and the pressing block;

[0096] (2) Then install the assembly of the clamping block and the carbide rod along the groove slide of the hammer handle and fix it with bolts.

[0097] The present invention uses TiC hard alloy as the main wear-resistant medium to increase the wear resistance of the hammer head, thereby increasing the service life; the present invention increases the overall impact resistance of the hammer head to prevent it from breaking during use; the present invention is convenient for disassembly and assembly, saves costs, reduces the energy consumption of production enterprises, and achieves the purpose of energy saving and emission reduction.

[0098] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A method for preparing an assembled wear-resistant hammer head, characterized in that: The wear-resistant hammer head includes a hammer handle, a pressing block, and a cemented carbide rod. The cemented carbide rod includes a plurality of cemented carbide rods, and all of the cemented carbide rods are installed in the countersunk holes of the pressing block. The pressing block is integrally fixedly connected to the hammer handle. The cemented carbide rod is a steel-bonded cemented carbide formed by vacuum sintering, and a boss is provided on one end surface of the cemented carbide rod. The composition of the cemented carbide rod is: TiC: 88-90wt.%, B2C: 1-1.5wt.%, the balance is Fe-Ni alloy, wherein the Ni content is 12wt.%; The cross section of the cemented carbide rod is circular and has a diameter of 10-15 mm; the clamping block adopts a "U"-shaped structure, and its shape is consistent with the bottom of the hammer handle. The clamping block is provided with a plurality of countersunk holes for mounting the cemented carbide rod; the clamping block is made of high-chromium cast iron; the ratio of the diameter of the cemented carbide rod to the wall thickness of the mesh metal matrix processed by the clamping block is 3:1-1.5:1; The preparation method comprises the following steps: Preparation of cemented carbide rods: The cemented carbide rods were prepared by vacuum sintering process, the above weight of powder was weighed, the particle size of the powder was 1200 mesh, and a planetary ball mill was used for wet grinding for 4-5 hours, and the rotation speed was 120-150 rpm; the sintering curve was as follows: heating to 300° at 50° / h, and keeping warm for 1.5 hours; heating to 720° at 30° / h, and keeping warm for 2 hours; heating to 1100° at 30° / h, and keeping warm for 2.5 hours; heating to 1350° at 20° / h, and keeping warm for 1 hour; then cooling to 830° at 25° / h, and keeping warm for 1.5 hours; then cooling to room temperature with the furnace; The hammer handle is made of ordinary low carbon steel by sand casting or lost foam casting; The specific assembly operations are: (1) The pressing block is heated to 200-250°C, and then the above-mentioned cemented carbide rods are inserted into the holes in sequence at this temperature; after cooling to room temperature, a transition fit is formed between the cemented carbide rod and the pressing block; (2) Then install the assembly of the clamping block and the carbide rod along the groove slide of the hammer handle and fix it with bolts.

2. The method for preparing an assembled wear-resistant hammer head according to claim 1, characterized in that: The clamping block is integrally fixedly connected to the bottom of the hammer handle via fixing screws.

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