Powder metallurgy forming die for valve plate

Abstract

A powder metallurgy forming die for a valve plate belongs to the field of die manufacturing and comprises a forming female die, an upper forming punch, a lower forming punch, a second lower punch and a core rod, and a cavity block used for forming an outer contour structure of the valve plate is nested in an inner cavity of the forming female die. A convex through hole matched with the second lower punch and a core rod hole matched with the core rod are formed in the lower forming punch, the second lower punch comprises a cylindrical section, a special-shaped column section and a convex supporting section which are sequentially distributed from top to bottom, and the upper forming punch, the lower forming punch, the second lower punch and the core rod sequentially stretch into the inner cavity to form a valve plate cavity. By reasonably designing the structures of all the parts, large-batch and high-precision manufacturing of the valve plate is achieved through the general powder metallurgy technology, and the labor cost and the mold cost are reduced.

Description

Technical Field

[0001] The utility model belongs to the field of mold manufacturing, and in particular relates to a powder metallurgy forming mold for a valve plate. Background Art

[0002] Molds are various molds and tools used in industrial production to form the desired products by injection molding, blow molding, extrusion, die casting or forging, smelting, stamping, stretching and other methods. Powder metallurgy is an industrial technology that produces metal powder or uses metal powder (or a mixture of metal powder and non-metallic powder) as raw materials, and produces metal materials, composite materials and various types of products through molding and sintering. Powder metallurgy technology has a series of advantages such as significant energy saving, material saving, excellent performance, high product precision and good stability, and is very suitable for mass production. When using powder metallurgy technology to form products, the design of the mold is crucial.

[0003] For valve plates, powder metallurgy technology can be used to manufacture them, which can reduce the number of processes, improve efficiency, and reduce the labor intensity of production personnel. Since the various openings in the valve plate are of special shapes, a specific molding die is required for pressing and molding. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a powder metallurgy forming die for a valve plate, and through reasonable design of the structure of each component, general powder metallurgy technology is used to realize mass and high-precision manufacturing of the valve plate, thereby reducing labor costs and die costs.

[0005] The technical solution adopted by the utility model is: a powder metallurgy forming mold for a valve plate, including a forming female mold, a forming upper punch, a forming lower punch, a lower second punch and a core rod, a cavity block for forming an outer contour structure of the valve plate is nested in the inner cavity of the forming female mold, a convex through hole matching the lower second punch and a core rod hole matching the core rod are provided on the forming lower punch, the lower second punch includes a cylindrical section, a special-shaped cylindrical section, and a convex supporting section distributed in sequence from top to bottom, and the forming upper punch, the forming lower punch, the lower second punch and the core rod are sequentially extended into the inner cavity to form a valve plate cavity.

[0006] Furthermore, the cavity block is made of 45CrNi alloy.

[0007] Furthermore, the mandrel holes include circular holes, elongated holes, and bean-shaped holes of various specifications, and the mandrels include circular mandrels matching circular holes, flat mandrels matching elongated holes, and special-shaped mandrels matching bean-shaped holes.

[0008] Furthermore, the forming upper punch is provided with a through hole cooperating with various types of core rods, and a broad bean annular protrusion arranged around the broad bean-shaped hole.

[0009] Furthermore, the single-side clearance between the forming female die and the forming upper punch and the forming lower punch is 0.01-0.015 mm.

[0010] Furthermore, the single-side gaps between the core rod, the lower second punch and the forming lower punch are all 0.01-0.015 mm.

[0011] The beneficial effects produced by adopting the utility model are as follows: through reasonable design of the structure of each component, the general powder metallurgy technology can realize the mass and high-precision manufacturing of the valve plate, and the labor cost and the mold cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the forming female mold;

[0013] Figure 2 It is the structural diagram of the forming upper punch;

[0014] Figure 3 It is the structural diagram of the forming lower punch;

[0015] Figure 4 This is the structural diagram of the lower two strokes;

[0016] Figure 5 It is a three-dimensional picture of the upper part of the lower two punches;

[0017] Figure 6 is a structural diagram of the first embodiment of the mandrel;

[0018] Figure 7 is a structural diagram of a second embodiment of a mandrel;

[0019] Figure 8 is a structural diagram of the third embodiment of the mandrel;

[0020] Fig. 9 It is a three-view drawing of the valve plate of the utility model;

[0021] In the accompanying drawings: 1 is the forming female mold, 1-1 is the cavity block, 2 is the forming upper punch, 2-1 is the through hole, 2-2 is the bean-shaped ring protrusion, 3 is the forming lower punch, 3-1 is the convex through hole, 3-2 is the core rod hole, 4 is the lower second punch, 4-1 is the cylindrical section, 4-2 is the special-shaped column section, and 4-3 is the convex supporting section. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0023] See attached Figure 1-8A powder metallurgy forming die for a valve plate, comprising a forming female die 1, a forming upper punch 2, a forming lower punch 3, a lower second punch 4 and a core rod, wherein a cavity block 1-1 for forming the outer contour structure of the valve plate is nested in the inner cavity of the forming female die 1, and a convex through hole 3-1 matching the lower second punch 4 and a core rod hole 3-2 matching the core rod are provided on the forming lower punch 3, and the lower second punch 4 comprises a cylindrical section 4-1, a special-shaped column section 4-2, and a convex support section 4-3 distributed from top to bottom, and the forming upper punch 2, the forming lower punch 3, the lower second punch 4 and the core rod are sequentially extended into the inner cavity to form a valve plate cavity. The material of the cavity block 1-1 is 45CrNi alloy. Figure 6 As shown, the structure of the special-shaped column segment 4-2 includes convex protrusions and I-shaped grooves distributed on both sides of the cylindrical segment 4-1.

[0024] See attached Figure 3 and 6 -8, the mandrel hole 3-2 includes circular holes, elongated holes, and bean-shaped holes of various specifications, and the mandrel includes a circular mandrel matching the circular hole, a flat mandrel matching the elongated hole, and a special-shaped mandrel matching the bean-shaped hole. Figure 6 The first embodiment of the mandrel is a round mandrel of various specifications; Figure 7 The second embodiment of the mandrel is a flat mandrel; Figure 8 This is the third embodiment of the mandrel, specifically a special-shaped mandrel.

[0025] See attached Figure 2 The forming upper punch 2 is provided with a through hole 2-1 cooperating with various types of core rods and a broad bean annular protrusion 2-2 arranged around the broad bean-shaped hole.

[0026] To ensure the accuracy of the valve plate after forming, the single-side clearance between the forming female mold 1 and the forming upper punch 2 and the forming lower punch 3 is 0.01-0.015mm. The single-side clearance between the core rod, the lower second punch 4 and the forming lower punch 3 is 0.01-0.015mm.

[0027] When the mold of the utility model is used, each component in the device is equipped with a lifting drive device as needed. First, the forming female mold 1 and the forming lower punch 3 cooperate with each other to form a cavity, and then the powder is filled into the above-mentioned cavity, the lower two punches 4 and the core rod rise, and the forming upper punch 2 falls, and the punches are pressed to obtain the valve plate. After the pressing is completed, the forming lower punch 3, the lower two punches 4, and the core rod fall respectively, and the forming upper punch 2 rises, and the formed workpiece is taken out, and the demolding is completed.

[0028] The pressed valve plate blank is subjected to sintering, heat treatment and other processes to meet the design requirements of the valve plate, and finally forms a valve plate as shown in FIG8 .

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. A powder metallurgy forming die for a valve plate, comprising a forming female die (1), a forming upper punch (2), a forming lower punch (3), a lower secondary punch (4) and a core rod, characterized in that: A cavity block (1-1) for forming the outer contour structure of a valve plate is nested in the inner cavity of the female molding die (1); a convex through hole (3-1) matching the lower second punch (4) and a core rod hole (3-2) matching the core rod are provided on the molding lower punch (3); the lower second punch (4) comprises a cylindrical section (4-1), a special-shaped cylindrical section (4-2), and a convex supporting section (4-3) which are sequentially distributed from top to bottom; the molding upper punch (2), the molding lower punch (3), the lower second punch (4), and the core rod sequentially extend into the inner cavity to form a valve plate cavity.

2. The powder metallurgy forming die for the valve plate according to claim 1, characterized in that: The cavity block (1-1) is made of 45CrNi alloy.

3. The powder metallurgy forming die for the valve plate according to claim 1, characterized in that: The core rod holes (3-2) include circular holes, elongated holes, and bean-shaped holes of various specifications, and the core rods include circular core rods matching the circular holes, flat core rods matching the elongated holes, and special-shaped core rods matching the bean-shaped holes.

4. The powder metallurgy forming die for the valve plate according to claim 2, characterized in that: The forming upper punch (2) is provided with a through hole (2-1) cooperating with the core rod, and a broad bean annular protrusion (2-2) arranged around the broad bean-shaped hole.

5. The powder metallurgy forming die for the valve plate according to claim 1, characterized in that: The single-side clearance between the forming female die (1) and the forming upper punch (2) and the forming lower punch (3) is 0.01-0.015 mm.

6. The powder metallurgy forming die for the valve plate according to claim 1, characterized in that: The single-side clearances between the core rod, the lower second punch (4) and the forming lower punch (3) are all 0.01-0.015 mm.

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