Combined type fixed width machine hammerhead

Abstract

The invention discloses a combined type fixed width machine hammerhead, and relates to the technical field of fixed width machines. The combined type fixed width machine hammerhead comprises a hammerhead body, the hammerhead body comprises a plurality of hammerhead sections connected in sequence, and each hammerhead section is provided with a working face; wherein the plurality of working surfaces at least comprise any two of a concave surface, a convex surface and a plane. According to the hammer head, functional integration can be carried out on working faces in various geometrical forms such as a convex face, a plane and a concave face, the contact state, stress field distribution and a metal flowing path of a plate blank corner area are reconstructed through the synergistic effect of the different working faces, and meanwhile the deformation mode of the corner area is optimized, so that the deformation of the plate blank corner area is optimized. And forming defects, such as edge turnup, folding, bulging, surface waves and edge cracks, of edge corners of the plate blank can be reduced.

Description

Technical Field

[0001] This application relates to the field of width-fixing machine technology, and in particular to a combined width-fixing machine hammer. Background Technology

[0002] In the hot rolling process of metals, the width slab mill is a key piece of equipment for controlling the width of the slab, and its performance directly affects the stability of the rolling process and the dimensional accuracy of the final product. Among them, the hammer head of the width slab mill is the core component that directly contacts the slab and applies impact force, and its structural design is particularly critical to the forming quality of the slab's corner areas.

[0003] Currently widely used hammerheads employ a single, fixed structure, making it difficult to achieve a precise balance between localized pressure control in corner areas and the overall surface flatness of the slab during actual operation. This structural limitation often leads to uneven pressure distribution and turbulent metal flow at the corners, resulting in forming defects such as folding, cracking, and uneven edges. This not only weakens the material's mechanical properties but also adversely affects subsequent processes like finishing rolling and coiling, and in severe cases, can even lead to product scrap.

[0004] Therefore, how to provide a combined width-fixing machine hammer that can reduce forming defects at the edges and corners of slabs is a problem that urgently needs to be solved. Summary of the Invention

[0005] The first aspect of this application provides a combined width-fixing machine hammer head, comprising: a hammer head body, the hammer head body comprising a plurality of hammer head segments connected in sequence, each hammer head segment having a working surface; wherein the plurality of working surfaces include at least two of concave surfaces, convex surfaces, and planes.

[0006] In some embodiments, the plurality of hammer head segments include a first hammer head segment and a second hammer head segment. The first hammer head segment has a protrusion to form a convex surface, and the second hammer head segment has a groove to form a concave surface. The first hammer head segment and the second hammer head segment are arranged sequentially along a first direction.

[0007] In some embodiments, the width of the groove in the second direction is greater than the width of the protrusion; the second direction is perpendicular to the first direction.

[0008] In some embodiments, the central axis of the protrusion extending in a first direction coincides with the central axis of the groove extending in the first direction.

[0009] In some embodiments, the protrusion has an arc-shaped segment and a straight segment connected in sequence, and the straight segment is connected to the second hammer head segment.

[0010] In some embodiments, the depth of the groove in the third direction is greater than the protrusion height of the protrusion in the third direction, and the bottom surface of the groove is coplanar with the top surface of the protrusion; the first direction, the second direction and the third direction are perpendicular to each other.

[0011] In some embodiments, two adjacent hammerhead segments are detachably connected.

[0012] In some embodiments, the opening size of the groove increases upwards in the third direction.

[0013] In some embodiments, the bottom of the groove transitions to the sidewall of the groove in an arc shape.

[0014] In some embodiments, the combined width-fixing machine hammerhead further includes a high-temperature resistant ceramic layer disposed on the working surface of the hammerhead section.

[0015] Compared to existing technologies, this solution's hammerhead section features different shaped working surfaces that spatially differentiate functional zones, each undertaking a specific forming task. This allows the hammerhead to guide the deformation process in stages, both temporally and spatially. The hammerhead can precisely guide metal flow behavior in stages and regions at different stages of the deformation process: from initial contact, intermediate compression to final pressing and forming. This solves the technical contradiction of traditional hammerheads in balancing rapid edge closure and overall flat forming. By functionally integrating working surfaces of various geometric shapes such as convex, flat, and concave surfaces, the hammerhead reconstructs the contact state, stress field distribution, and metal flow path of the slab's corner areas through the synergistic effect of different working surfaces. Simultaneously, by optimizing the deformation mode of the corner areas, it can reduce forming defects at the slab's corners, such as edge curling, folding, bulging, surface wavy patterns, and edge cracks. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the first angle of a combined width-fixing machine hammer according to an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of the second angle of a combined width-fixing machine hammer according to an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of the third angle of a combined width-fixing machine hammer head according to an embodiment of this application;

[0019] Figure 4 This is a partial cross-sectional view of the second hammer section of a combined width-fixing machine hammer according to an embodiment of this application;

[0020] Figure 5 This is a partial cross-sectional view of the first hammer section of a combined width-fixing machine hammer according to an embodiment of this application;

[0021] Figure 6 This is a profile view of a slab after being pressed by a hammer head of a combined width-fixing machine according to an embodiment of this application.

[0022] Figure 7 A profile of a slab after being pressed by a convex hammerhead.

[0023] Figure 8 This is an equivalent stress distribution diagram of a slab after being pressed by a hammer head of a combined width-fixing machine according to an embodiment of this application.

[0024] Figure 9 This is an equivalent stress distribution diagram of a slab after being pressed by a convex hammerhead.

[0025] Figure 10 The equivalent stress comparison diagram of the combined hammer head and the convex hammer head of the width-fixing machine in this application.

[0026] Figure label:

[0027] 1. Hammer head body; 11. Hammer head section; 111. First hammer head section; 112. Second hammer head section; 2. Working surface; 21. Protrusion; 211. Arc-shaped section; 22. Groove; 212. Straight section; 3. Slab; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0028] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0029] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element. The term "two or more" includes two or more cases.

[0030] In hot-rolled strip steel production, width-fixing mills are used to pre-compress continuously cast slabs 3 in the width direction before rough rolling, thereby reducing the reduction of the vertical rolls and improving the yield. However, the hammers of traditional width-fixing mills are single-planar structures that are integrally cast or forged. When subjected to severe lateral impact on the high-temperature, high-plasticity slab 3, the corner areas are prone to defects such as edge folding, edge cracking, uneven width, and surface wavy due to metal flow instability. A single-planar hammer cannot simultaneously address the contradiction between rapid edge closure and overall flat forming. If the pressure is too high, the edges are prone to curling; if the pressure is too low, the edges are not sufficiently compacted, resulting in internal porosity.

[0031] like Figures 1-5 As shown, in order to solve the above problems, the first aspect of the present application provides a combined width-fixing machine hammer head, including: a hammer head body 1, the hammer head body 1 including a plurality of hammer head segments 11 connected in sequence, each hammer head segment 11 having a working surface 2; wherein the plurality of working surfaces 2 include at least two of concave surfaces, convex surfaces and planes.

[0032] In one possible scenario, the combined width-fixing mill hammers of this embodiment are mounted on the width-fixing mill at the front end of the roughing mill of the hot continuous rolling production line. They can be symmetrically arranged on the left and right side pressure arms of the width-fixing mill. During the rolling process, the hammers on both sides move inward synchronously, applying transverse lateral pressure to the high-temperature continuously cast slab 3 to achieve pre-compression in the width direction. The hammer body 1 includes multiple hammer segments 11, which are connected sequentially along the slab 3's travel direction. Each hammer segment 11 has a working surface 2 for contacting the slab. The multiple working surfaces 2 formed by the multiple hammers include at least two of the following: concave surfaces, convex surfaces, and planar surfaces. For example, the number of hammer head segments 11 may be 3, with one hammer head segment 11 having a flat working surface 2 and the other two having concave working surfaces 2; or the number of hammer head segments 11 may be 2, with one hammer head segment 11 having a convex working surface 2 and the other having a concave working surface 2; or the number of hammer head segments 11 may be 3, with the working surfaces 2 of the three hammer head segments 11 being convex, concave, and flat, respectively. Multiple hammer head segments 11 can be integrally formed, or multiple hammer head segments 11 can be independent components. Adjacent hammer heads can be detachably connected via dovetail grooves and tenons, such as by providing dovetail grooves and tenons on the mating surfaces of adjacent hammer head segments 11, or by connecting adjacent hammer heads via locating pins and bolt holes.

[0033] The convex hammer section 11 is used for concentrated pressure, first contacting the edge of the slab 3 to form a high-stress focusing area, quickly compacting the loose structure, forcing the metal to flow inward, effectively achieving initial closure of the edge, and suppressing the formation of rollover and early wrinkles; the concave hammer section 11, through its concave structure, constructs lateral retaining walls and local mold cavities, providing rigid boundary constraints for the deformed corner areas, limiting the outward flow of metal along the width direction, and preventing secondary rollover and edge bulging; while the hammer section 11 with the planar working surface 2 plays the role of smooth transition, uniform force transmission and release of local stress, avoiding stress concentration caused by geometric abrupt changes, and ensuring the flat forming of the central area.

[0034] In this design, the tooling surfaces of different shapes in the hammerhead form differentiated functional areas in space, each undertaking a specific forming task. This allows the hammerhead to guide the deformation process in stages, both temporally and spatially. The hammerhead can precisely guide the metal flow behavior in stages and regions at different stages of the deformation process: from initial contact, intermediate compression to final pressing and forming. This solves the technical contradiction of traditional hammerheads in balancing "rapid edge closure" and "overall flat forming." The hammerhead can functionally integrate various geometric shapes of working surfaces 2, such as convex, flat, and concave surfaces. Through the synergistic effect of different working surfaces 2, it can reconstruct the contact state, stress field distribution, and metal flow path of the slab's corner areas. Simultaneously, by optimizing the deformation mode of the corner areas, it can reduce forming defects at the corners of the slab, such as edge curling, folding, bulging, surface wavy patterns, and edge cracks.

[0035] like Figure 3 As shown, in some embodiments, the plurality of hammer head segments 11 include a first hammer head segment 111 and a second hammer head segment 112. The first hammer head segment 111 is provided with a protrusion 21 to form a convex surface, and the second hammer head segment 112 is provided with a groove 22 to form a concave surface. The first hammer head segment 111 and the second hammer head segment 112 are arranged sequentially along the first direction X.

[0036] In one possible scenario, the plurality of hammerheads includes a first hammerhead segment 111. The surface of the first hammerhead segment 111 is provided with a protrusion 21, which is used to contact the slab 3. The protrusion height of the protrusion 21 can be set according to the required lateral pressure and the width of the slab 3. A groove 22 is provided on one side of the second hammerhead segment 112. The depth of the groove 22 can be set according to the protrusion height of the protrusion 21 and adapted to the protrusion 21. The first hammerhead segment 111 and the second hammerhead segment 112 are connected sequentially along a first direction X. The number of the first hammerhead segment 111 and the second hammerhead segment 112 can be multiple, such as: there is one first hammerhead segment 111 and one second hammerhead segment 112, or there is one first hammerhead segment 111 and two second hammerhead segments 112, with the second hammerhead segments 112 disposed between two second hammerhead segments 112, etc. Here, the first direction X is the rolling direction.

[0037] In the initial contact stage of the hammerhead, the protrusion 21 first contacts the edge of the slab 3, forming a small area of ​​high stress zone, quickly compacting the loose structure at the edge, forcing the metal to flow inward, and effectively inhibiting edge rolling and early wrinkle formation. After the protrusion 21 completes the initial compression, the groove 22 then contacts the deformed corner area of ​​the slab 3. When the edge metal attempts to flow outward along the direction of the slab 3, it will directly impact the sidewall of the groove 22. The sidewall can be made of high-strength mold steel, which has high hardness and rigidity and will not undergo plastic deformation. Therefore, the metal cannot break through the boundary of the sidewall of the groove 22 and is forced to change its flow direction, instead flowing towards the thickness direction of the slab 3 or the rolling direction. The concave surface, through the lateral baffle formed by its concave structure and the local mold cavity, applies rigid boundary constraints to the corner metal of the slab 3 in a high-temperature softened state in physical space.

[0038] In this embodiment, the synergistic effect of the convex and concave surfaces reconstructs the stress-strain field of the deformation zone. The protrusion 21 provides a concentrated driving force, and the groove 22 provides a boundary constraint force. The two form a dynamic cooperation mechanism of first pressing and then limiting in time and space, which makes the metal flow path change from disordered to controllable, and the stress distribution changes from local concentration to gradient and uniformity. This alleviates the tensile stress concentration in the corner area and reduces the risk of hot cracks (edge ​​cracks).

[0039] like Figure 6 The image shown is a slab outline after pressing using a combined hammerhead with convex and concave surfaces, as described in this scheme. Figure 7 As shown, this is a profile of the slab after being pressed by a convex hammerhead. Figure 8 The figure shown is an equivalent stress distribution diagram of the slab after pressing by the combined hammer head with convex and concave surfaces in this scheme. Figure 9 The figure shows the equivalent stress distribution of a slab after being pressed by a convex hammer. Figures 6-9In the middle, the left side of the slab is the pressed surface. It can be seen that after the combined hammer head with the combination of convex and concave surfaces in this application presses the slab, the flatness of the edges and corners of the slab is better.

[0040] like Figure 10 As shown, by comparing and analyzing the simulation results of using a convex hammerhead alone and a convex-concave combined hammerhead, the horizontal axis represents the marked points, and the vertical axis represents the equivalent stress. In the figure, the solid line represents the convex hammerhead, and the dashed line represents the convex-concave combined hammerhead. It can be seen that when using the convex hammerhead alone, the equivalent stress range at the corner marked points is 20.2 MPa–22.7 MPa, which is in the stress peak region. In the combined hammerhead, after the secondary pressing of the concave hammerhead segment 11, the stress in this area decreases to 15.5 MPa–18.2 MPa, indicating that the stress level is somewhat alleviated. However, the principal stress is still dominated by the stage applied by the convex hammerhead segment 11. The concave hammerhead segment 11, through its enveloping contact method, can effectively shape the corner contours, smooth local wrinkles, and improve surface flatness. The convex hammer section 11 provides rapid initial pressing and relieves corner stress, while the concave hammer section 11 achieves fine shaping. The two work together to improve corner quality while avoiding indentations or deformation caused by a single structure. This fixed-width machine combined hammer is suitable for slab pressing processes with high requirements for corner quality.

[0041] like Figure 4 , Figure 5 As shown, in some embodiments, the width of the groove 22 in the second direction Y is greater than the width of the protrusion 21; the second direction Y is perpendicular to the first direction X.

[0042] In one possible scenario, the width of the groove 22 in the second direction Y is greater than the width of the protrusion 21, which can guide the metal to be distributed more evenly in the groove 22, increasing the effective contact area between the sidewall of the groove 22 and the corner of the slab 3. This allows the groove 22 to cover the corner area deformed after initial pressing as much as possible, allowing more metal to enter the interior of the groove 22. This helps to disperse the pressure applied to the corner of the slab 3, reduce local stress peaks, and thus reduce the risk of edge cracking.

[0043] In some embodiments, the central axis of the protrusion 21 extending along the first direction X coincides with the central axis of the groove 22 extending along the first direction X.

[0044] In one possible scenario, the protrusion 21 refers to a convex structure on the working surface 2 of the first hammer head section 111, a boss that extends continuously along the rolling direction. The central axis extending from the protrusion 21 along the first direction X is a virtual straight line formed by connecting the center points of symmetry on the cross-section of the protrusion 21 (the cross-section perpendicular to the first direction X) along its length. This straight line is parallel to the first direction X and located at the geometric center of the protrusion 21. The groove 22 is an inwardly recessed structure on the second hammer head section 112, and is also a U-shaped groove or channel extending along the rolling direction. The central axis extending from the groove 22 along the first direction X is a virtual straight line formed by connecting the center points of symmetry (i.e., the midline between the left and right sidewalls) on the cross-section of the groove 22 along its length. This straight line is also parallel to the first direction X and located at the geometric center of symmetry of the groove 22. When the central axis of the protrusion 21 coincides with that of the groove 22, the two form a continuous, centered, and non-offset functional transition zone along the first direction X, which avoids the problem of local stress eccentricity or metal flow asymmetry caused by axis misalignment. This makes the force applied by the hammer to the slab 3 during the compression process more evenly distributed, and prevents defects such as edge twisting, warping, or unilateral bulging caused by eccentric loading.

[0045] like Figure 2 As shown, in some embodiments, the protrusion 21 is provided with an arc-shaped segment 211 and a straight segment 212 connected in sequence, and the straight segment 212 is connected to the second hammer head segment 112.

[0046] In one possible scenario, the arc-shaped segment 211 is located at the front end of the protrusion 21, and the straight segment 212 is located at the rear end, adjacent to the second hammer head segment 112. As the slab 3 advances in the width-fixing machine, the slab 3 sequentially contacts the arc-shaped segment 211, the straight segment 212, and then the second hammer head of the protrusion 21. By setting the arc-shaped segment 211 in the protrusion 21, a small contact area is formed, and the rounded transition reduces stress abrupt changes and avoids local crushing.

[0047] like Figure 4 , Figure 5 As shown, in some embodiments, the depth of the groove 22 in the third direction Z is greater than the protrusion height of the protrusion 21 in the third direction Z, and the bottom surface of the groove 22 is coplanar with the top surface of the protrusion 21; the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0048] In one possible scenario, the third direction Z represents the width direction of the slab 3, i.e., the direction in which the lateral pressure is applied by the hammer of the width-fixing machine. The depth of the groove 22 refers to the maximum distance from the outermost opening of the groove 22 to its bottom surface in the third direction Z, and the protrusion height of the protrusion 21 refers to the amount of protrusion from the base surface of the first hammer section 111 to the top surface of the protrusion 21 in the third direction Z. In the initial pressing stage, the protrusion 21 first contacts the edge of the slab 3. As the lateral pressure proceeds, the edge of the slab 3 is compressed and moves inward. Then, the groove 22 of the second hammer section 112 gradually approaches and finally contacts the deformed corner area, realizing an orderly process of first being compacted by the protrusion 21 and then constrained by the groove 22. The depth of the groove 22 is greater than the height of the protrusion, meaning that the groove 22 has a greater space-accommodating capacity, capable of enclosing the corner metal that has been pressed in by the protrusion 21. Even if the metal softens at high temperatures and has a tendency to spring back, it can be effectively locked by the groove 22, preventing it from rolling over or bulging out, thus improving its adaptability to severe deformation. The fact that the bottom surface of the groove 22 and the top surface of the protrusion 21 are coplanar can avoid steps or gaps caused by misalignment of the end faces.

[0049] like Figure 4 As shown, in some embodiments, the opening size of the groove 22 increases in the third direction Z.

[0050] In one possible scenario, the cross-section of the groove 22 is wider at the outside and narrower at the inside. For example, the width of the groove 22 gradually increases from the bottom to the opening end, and the cross-sectional shape can be an inverted trapezoid, an outwardly expanding arc, or a trumpet shape. The opening size of the groove 22 increases in the third direction Z, making its cross-section have an inverted trapezoid, an outwardly expanding arc, or a trumpet shape, which is wider at the outside and narrower at the inside. This achieves gradient guidance and flexible constraint of the high-temperature metal flow during the compression stage, reduces the biting effect and frictional resistance between the metal and the groove 22, and prevents the generation of secondary defects such as adhesion and tearing.

[0051] In some embodiments, the bottom of the groove 22 transitions to the sidewall of the groove 22 in an arc shape.

[0052] In one possible scenario, the bottom of the groove 22 and the sidewall adopt an arc-shaped transition, that is, the bottom of the groove 22 and the sidewall are connected by a smooth arc. The arc-shaped transition allows the hammer head to achieve a larger area and closer contact with the edge of the slab 3, reduces the exposed area between the metal and the air, improves the heat conduction efficiency, and suppresses the loss of heat from the edge to the environment, thereby effectively suppressing the occurrence of hot forming defects such as edge cracks and curling.

[0053] In some embodiments, the combined width-fixing machine hammerhead further includes a high-temperature resistant ceramic layer disposed on the working surface 2 of the hammerhead section 11.

[0054] In one possible scenario, the combined width-fixing machine hammerhead also includes a high-temperature resistant ceramic layer. This layer is disposed on the working surface 2 of the hammerhead section 11, covering the working surface 2 that directly contacts the high-temperature slab 3, such as a convex surface, a concave surface, or a flat working surface 2. The high-temperature resistant ceramic layer can be prepared by thermal spraying, laser cladding, or other surface strengthening processes. During the hot rolling process, the hammerhead working surface 2 is subjected to prolonged and intense friction with the high-temperature (1100–1250℃), highly ductile slab 3. Traditional metal materials are prone to adhesion, scratches, and wear. The high-temperature resistant ceramic layer has a hardness and wear resistance far exceeding that of the steel substrate, effectively resisting the scratching and adhesion of oxide scale, inclusions, and ductile metals from the slab 3.

[0055] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0056] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0057] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0058] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A combined width-fixing machine hammer head, characterized in that, include: The hammer head body comprises multiple hammer head segments connected in sequence, and each hammer head segment is provided with a working surface; The plurality of said working surfaces include at least two of the following: concave surfaces, convex surfaces, and planes.

2. The combined width-fixing machine hammer head according to claim 1, characterized in that, The plurality of hammer head segments include a first hammer head segment and a second hammer head segment. The first hammer head segment has a protrusion to form the convex surface, and the second hammer head segment has a groove to form the concave surface. The first hammer head segment and the second hammer head segment are arranged sequentially along a first direction.

3. The combined width-fixing machine hammer head according to claim 2, characterized in that, The width of the groove in the second direction is greater than the width of the protrusion; The second direction is perpendicular to the first direction.

4. The combined width-fixing machine hammer head according to claim 2, characterized in that, The central axis of the protrusion extending in the first direction coincides with the central axis of the groove extending in the first direction.

5. A combined width-fixing machine hammer head according to claim 2, characterized in that, The protrusion has an arc-shaped segment and a straight segment connected in sequence, and the straight segment is connected to the second hammer head segment.

6. A combined width-fixing machine hammer head according to claim 3, characterized in that, The depth of the groove in the third direction is greater than the protrusion height of the protrusion in the third direction, and the bottom surface of the groove is coplanar with the top surface of the protrusion. The first direction, the second direction, and the third direction are perpendicular to each other.

7. A combined width-fixing machine hammer head according to claim 1, characterized in that, The two adjacent hammerhead sections are detachably connected.

8. A combined width-fixing machine hammer head according to claim 3, characterized in that, The opening size of the groove increases upwards from the third direction.

9. A combined width-fixing machine hammer head according to claim 2, characterized in that, The bottom of the groove transitions into the sidewall of the groove in an arc shape.

10. A combined width-fixing machine hammer head according to claim 1, characterized in that, Also includes: A high-temperature resistant ceramic layer is disposed on the working surface of the hammer head section.

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