Powder metallurgy forming die for cover plate

Abstract

A powder metallurgy forming die for a cover plate belongs to the field of die manufacturing and comprises a forming female die, an upper forming punch, a first lower forming punch, a second lower punch and a core rod, and a cavity block used for forming an outer contour structure of the cover plate is nested in an inner cavity of the forming female die. A square through hole matched with the second lower punch, first through holes symmetrically formed in the two sides of the square through hole and matched with the core rod and an annular protrusion surrounding the square through hole and the first through holes and arranged at the end of the first lower forming punch are formed in the center of the first lower forming punch, and the second lower punch comprises a cylindrical section, a square column section and a supporting section which are sequentially distributed from top to bottom. Arc-shaped grooves for avoiding the core rod are formed in the two sides of the supporting section, and the upper forming punch, the first lower forming punch, the second lower punch and the core rod extend into the inner cavity to form a cover plate cavity. By reasonably designing the structures of all the parts, large-batch and high-precision manufacturing of the cover 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 cover plate. Background Art

[0002] In the prior art, the cover plate is a relatively conventional component, which is generally formed by machining. Since the cover plate may be designed with structures such as bosses, grooves, chamfers, etc., the processing procedures are complicated, there are many procedures, serious material waste, low production efficiency, high production costs, and high labor intensity for production personnel.

[0003] With the development of powder metallurgy technology, parts are processed by using metal powder as raw material through the process of molding and sintering. It has a series of advantages such as energy saving, material saving, excellent performance, high precision and stability, and is very suitable for large-scale production. When using powder metallurgy technology to produce cover plates, since cover plates are often special-shaped workpieces designed according to the working conditions, specific molding dies are required for pressing and molding, and the structure of the molding dies is crucial to the molding quality of the cover plates in the later stage. 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 cover 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 cover plate, thereby reducing labor costs and die costs.

[0005] The technical scheme adopted by the utility model is: a powder metallurgy forming mold for a cover plate, comprising 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 cover plate is nested in the inner cavity of the forming female mold, a square through hole matching the lower second punch is arranged at the center position of the forming lower punch, a first through hole symmetrically arranged on both sides of the square through hole and cooperating with the core rod, and an annular protrusion surrounding the square through hole and the first through hole and arranged at the end of the forming lower punch, the lower second punch comprises a cylindrical section, a square column section and a supporting section distributed in sequence from top to bottom, arc grooves for avoiding the core rod are arranged on both sides of the supporting section, and the forming upper punch, the forming lower punch, the lower second punch and the core rod extend into the inner cavity to form a cover plate cavity.

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

[0007] Furthermore, the forming upper punch is provided with a second through hole and a third through hole respectively cooperating with the cylindrical section and the core rod in the lower second punch.

[0008] 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.

[0009] Furthermore, the single-side gaps between the core rod, the lower second punch and the lower punch for forming are all 0.01-0.015 mm.

[0010] 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 cover plate, thereby reducing the labor cost and the mold cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the molding die of the utility model;

[0012] Figure 2 It is a top view of the cavity block;

[0013] Figure 3 It is a bottom view of the forming punch;

[0014] Figure 4 It is a structural diagram of the next punch of forming;

[0015] Figure 5 This is a top view of the lower second punch.

[0016] Figure 6 It is a three-view drawing of the cover plate of the utility model;

[0017] 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 second through hole, 2-2 is the third through hole, 3 is the forming lower punch, 3-1 is the square through hole, 3-2 is the first through hole, 3-3 is the annular protrusion, 4 is the lower second punch, 4-1 is the cylindrical section, 4-2 is the square column section, 4-3 is the supporting section, 4-4 is the arc-shaped groove, and 5 is the core rod. DETAILED DESCRIPTION

[0018] 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.

[0019] See attached Figure 1-5A powder metallurgy forming mold for a cover plate, comprising a forming female mold 1, a forming upper punch 2, a forming lower punch 3, a lower second punch 4 and a core rod 5, wherein a cavity block 1-1 for forming the outer contour structure of the cover plate is nested in the inner cavity of the forming female mold 1, a square through hole 3-1 matching the lower second punch 4 is arranged at the center of the forming lower punch 3, a first through hole 3-2 symmetrically arranged on both sides of the square through hole 3-1 and matching the core rod 5, and an annular protrusion 3-3 surrounding the square through hole 3-1 and the first through hole 3-2 and arranged at the end of the forming lower punch 3, the lower second punch 4 comprises a cylindrical section 4-1, a square column section 4-2, and a support section 4-3 distributed from top to bottom, and arc grooves 4-4 are arranged on both sides of the support section 4-3 to avoid the core rod 5, and the forming upper punch 2, the forming lower punch 3, the lower second punch 4 and the core rod 5 extend into the inner cavity to form a cover plate cavity. The material of the cavity block 1-1 is 45CrNi alloy.

[0020] See attached Figure 3 The upper forming punch 2 is provided with a second through hole 2-1 and a third through hole 2-2 which respectively cooperate with the cylindrical section 4-1 in the lower second punch 4 and the core rod 5.

[0021] To ensure the accuracy of the cover 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 5, the lower second punch 4 and the forming lower punch 3 is 0.01-0.015mm.

[0022] 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 5 rise, and the forming upper punch 2 falls, and the punches are pressed to obtain a cover plate. After the pressing is completed, the forming lower punch 3, the lower two punches 4, and the core rod 5 fall respectively, and the forming upper punch 2 rises, and the formed workpiece is taken out, and the demolding is completed.

[0023] The pressed cover plate blank is subjected to sintering, heat treatment and other processes to meet the design requirements of the cover plate, and finally forms a cover plate as shown in FIG6 .

[0024] 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 cover 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 (5), characterized in that: A cavity block (1-1) for forming the outer contour structure of a cover plate is nested in the inner cavity of the female molding die (1); a square through hole (3-1) matching the lower second punch (4) is arranged at the center of the lower molding die (3); first through holes (3-2) matching the core rod (5) are symmetrically arranged on both sides of the square through hole (3-1); and an annular protrusion (3-3) surrounding the square through hole (3-1) and the first through hole (3-2) and arranged at the end of the lower molding die (3); the lower second punch (4) comprises a cylindrical section (4-1), a square cylindrical section (4-2), and a support section (4-3) which are sequentially arranged from top to bottom; arc-shaped grooves (4-4) for avoiding the core rod (5) are arranged on both sides of the support section (4-3); the upper molding die (2), the lower molding die (3), the lower second punch (4), and the core rod (5) extend into the inner cavity to form a cover plate cavity.

2. The powder metallurgy forming die for the cover 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 cover plate according to claim 1, characterized in that: The upper forming punch (2) is provided with a second through hole (2-1) and a third through hole (2-2) respectively cooperating with the cylindrical section (4-1) of the lower second punch (4) and the core rod (5).

4. The powder metallurgy forming die for the cover 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.

5. The powder metallurgy forming die for the cover plate according to claim 1, characterized in that: The single-side clearances between the core rod (5), the lower second punch (4) and the lower forming punch (3) are all 0.01-0.015 mm.

Images