Mold structure

Abstract

The invention discloses a mold structure, comprising a lower punch mechanism, an upper punch mechanism and a die, the lower punch mechanism comprising a first punch plate seat, a second punch plate seat and a third punch plate seat, the first punch plate seat and the third punch plate seat are fixedly mounted on a fixed template, the second punch plate seat is mounted on a floating template and can float relative to the fixed template, a lower punch is fixedly connected to the upper portion of the first punch plate seat, two lower punches are fixedly connected to the upper portion of the second punch plate seat, three lower punches that can float relative to the third punch plate seat are arranged on the upper portion of the third punch plate seat, the upper portions of the lower punch and the three lower punches form a cavity for the upper portions of the two lower punches to pass through; the upper punch mechanism comprises an upper punch that can move up and down, the upper punch is arranged toward one side of the lower punch mechanism; the die is arranged between the upper punch mechanism and the lower punch mechanism, the die can float relative to the fixed template, and a first through hole for the upper punch and the lower punch mechanism to pass through is arranged in the middle portion of the die.

Description

Technical Field

[0001] The invention relates to the technical field of powder metallurgy, and in particular to a mold structure. Background Art

[0002] Powder metallurgy compacting is one of the basic processes in powder metallurgy production. Its purpose is to make loose powder into semi-finished products or finished products with predetermined geometric shape, size, density and strength. Powder metallurgy compacting refers to placing the powder mixture in a die, applying pressure to the powder body through a die punch to form it, then releasing the pressure and removing the pressed green body from the die. The die frame used for powder metallurgy compacting is a general term for the tools used in forming. It is composed of a die, a die support and a connector. The die is basically composed of an upper punch mechanism, a female die, a core rod and a lower punch mechanism. Some parts of the lower punch mechanism are installed on a fixed template, and some parts are installed on a floating template. In the prior art, when it is necessary to compact a product such as Figure 4 and Figure 5 When the workpiece shown in the figure is manufactured, it is necessary to replace the mold or increase machining, which is not conducive to reducing production costs and reducing material waste. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0004] To this end, the present invention proposes a mold structure with a simple structure, which can meet the size requirements of the product through one-time forming, eliminate the machining process, and reduce material waste.

[0005] A mold structure according to an embodiment of the present invention includes:

[0006] A lower punch mechanism, comprising a first punch plate seat, a second punch plate seat and a third punch plate seat, wherein the first punch plate seat, the second punch plate seat and the third punch plate seat are arranged in sequence from top to bottom, the first punch plate seat and the third punch plate seat are fixedly mounted on a fixed template, the second punch plate seat is mounted on a floating template and can float relative to the fixed template, a lower punch is fixedly connected to the upper portion of the first punch plate seat, two lower punches are fixedly connected to the upper portion of the second punch plate seat, and three lower punches are arranged on the upper portion of the third punch plate seat and can float relative to the third punch plate seat, and the upper portions of the lower punch and the three lower punches form a cavity for the upper portions of the two lower punches to pass through;

[0007] An upper punch mechanism, comprising an upper punch that can move up and down, and the upper punch is arranged toward one side of the lower punch mechanism;

[0008] The concave die is arranged between the upper punch mechanism and the lower punch mechanism, the concave die can float relative to the fixed template, and a first through hole for the upper punch and the lower punch mechanism to pass through is arranged in the middle of the concave die.

[0009] A mold structure according to an embodiment of the present invention has at least the following beneficial effects: by adopting the above structure, the position of the lower punch remains unchanged throughout the entire forming process. First, the positions of the die, the second lower punch and the third lower punch are adjusted according to the size of the workpiece to be formed, that is, the protruding length of the top of the second lower punch and the third lower punch relative to the lower punch is adjusted. During the pressing process, the positions of the die, the second lower punch and the third lower punch will all float downward, and the downward floating amount of the three can be controlled to ensure the forming quality of the workpiece to be formed. Through this forming method, the workpiece to be formed can be directly formed without the need for subsequent mechanical processing, thereby reducing material waste.

[0010] According to some embodiments of the present invention, a side of the upper punch facing the die is arranged in a stepped shape matching a step of a workpiece to be formed.

[0011] According to some embodiments of the present invention, upper portions of the first lower punch, the second lower punch, and the third lower punch all extend into the first through hole and cooperate with the inner wall of the die to form a cavity of the workpiece to be formed.

[0012] According to some embodiments of the present invention, it also includes a core rod, the upper part of which is mounted on the inner side of the lower part of the three lower punches, and a spring is mounted on the outer side of the upper part of the core rod, and a second through hole is provided in the middle part of the third punch seat for the spring and the upper part of the core rod to pass through; the lower part of the core rod extends radially outward to form an annular boss, one end of the spring abuts against the annular boss, and the other end abuts against the bottom end of the three lower punches.

[0013] According to some embodiments of the present invention, a limit block for limiting the floating amount of the third lower punch relative to the third punch seat is fixedly connected to the third punch seat.

[0014] According to some embodiments of the present invention, the middle portion of the limit block is a stepped third through hole, the lower portion of the three down punches is a stepped structure corresponding to the third through hole, the lower portion of the three down punches is embedded in the third through hole and can move relative to the limit block, and the limit block limits the upward movement range of the three down punches.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 A schematic structural diagram of a mold structure in a powder-filled state according to an embodiment of the present invention;

[0018] Figure 2 Schematic diagram comparing the powder filling state and the demoulding state of the mold structure according to an embodiment of the present invention;

[0019] Figure 3 A schematic diagram comparing a pressing state and a demoulding state of a mold structure according to an embodiment of the present invention;

[0020] Figure 4 and Figure 5 It is a side view of a workpiece to be formed according to an embodiment of the present invention.

[0021] Reference numerals:

[0022] Upper punch mechanism 100, upper punch 110, upper punch seat 120,

[0023] Concave mold 200,

[0024] The lower punch mechanism 300, the first punch plate seat 310, the lower punch 320, the second punch plate seat 330, the second lower punch 340, the third punch plate seat 350, the third lower punch 360, the limit block 370,

[0025] Spring 400,

[0026] Mandrel 500, annular boss 510,

[0027] Workpiece to be formed 600, step 610, notch 620 DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the present invention, it should be understood that, with respect to descriptions of orientation, the orientations or positional relationships indicated by terms such as “center, longitudinal, lateral, length, width, thickness, up, down, front, back, left, right, vertical, horizontal, top, bottom, inside, outside, circumferential, radial, and axial” are based on the orientations or positional relationships shown in the accompanying drawings and 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 orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", and "set" 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.

[0032] Refer to the following Figures 1 to 3 A mold structure according to an embodiment of the present invention is described.

[0033] like Figures 1 to 3 As shown, a mold structure according to an embodiment of the present invention includes an upper punch mechanism 100, a die 200, and a lower punch mechanism 300. The die 200 is disposed between the upper punch mechanism 100 and the lower punch mechanism 300, and is used to cooperate with the upper punch mechanism 100 and the lower punch mechanism 300 to form a cavity of a workpiece 600 to be formed.

[0034] The upper punch mechanism 100 includes an upper punch 110 and an upper punch seat 120. The upper punch 110 is arranged toward one side of the lower punch mechanism 300. The upper punch 110 is connected to the upper mold plate on the mold frame through the upper punch seat 120, so that the upper punch 110 can move up and down, and cooperate with the lower punch mechanism 300 to complete the pressing and demolding of the workpiece 600 to be formed. Further, the side of the upper punch 110 facing the die 200 is arranged in a stepped shape that matches the step 610 of the workpiece 600 to be formed.

[0035] The female mold 200 can float relative to the fixed mold plate, and a first through hole for the upper punch 110 and the lower punch mechanism 300 to pass through is provided in the middle of the female mold 200 .

[0036] The lower punch mechanism 300 includes a first punch plate seat 310, a second punch plate seat 330 and a third punch plate seat 350, which are arranged in sequence from top to bottom. The first punch plate seat 310 and the third punch plate seat 350 are fixedly installed on the fixed template, and the second punch plate seat 330 can float relative to the fixed template; a lower punch 320 is fixedly connected to the upper part of the first punch plate seat 310, and a second lower punch 340 is fixedly connected to the upper part of the second punch plate seat 330. The second lower punch 340 can float relative to the fixed template following the second punch plate seat 330, and a third lower punch 360 is provided on the upper part of the third punch plate seat 350, which can float relative to the third punch plate seat 350; wherein, the upper parts of the lower punch 320, the second lower punch 340 and the third lower punch 360 all extend into the first through hole in the middle of the die 200, and cooperate with the inner wall of the die 200 to form a cavity of the workpiece 600 to be formed.

[0037] Further, the upper part of the first punch 320 and the third punch 360 enclose a cavity for the upper part of the second punch 340 to pass through, the upper part of the second punch 340 passes through the cavity, and the upper side wall of the second punch 340 is closely fitted with the inner wall of the cavity, and at the same time, the top of the second punch 340 extends from the cavity. The upper side wall of the second punch 340 is closely fitted with the inner wall of the cavity to prevent the powder from entering the gap between the second punch 340 and the cavity during powder filling, affecting the quality of the workpiece 600 to be formed. The top of the second punch 340 extends from the cavity, and the length of the extension can be adjusted according to the height of the step 610 of the workpiece 600 to be formed. In the forming state, the distance between the top of the second punch 340 and the top of the first punch 320 is greater than the distance between the top of the second punch 340 and the top of the third punch 360, so as to form a notch 620 of the workpiece 600 to be formed.

[0038] like Figures 1 to 3As shown, a mold structure according to an embodiment of the present invention further includes a mandrel 500, the upper part of the mandrel 500 is sleeved on the inner side of the lower part of the three lower punches 360, and the upper part of the mandrel 500 is in clearance with the lower part of the three lower punches 360. A spring 400 is sleeved on the outer side of the upper part of the mandrel 500, and a second through hole for the spring 400 and the upper part of the mandrel 500 to pass through is provided in the middle of the third punch plate seat 350. The lower part of the mandrel 500 extends radially outward to form an annular boss 510, one end of the spring 400 abuts against the annular boss 510, and the other end abuts against the bottom end of the three lower punches 360. During the movement of the mandrel 500, the mandrel 500 drives the three lower punches 360 to float relative to the third punch plate seat 350 through the spring 400. Furthermore, the third punch plate seat 350 is also fixedly connected with a limit block 370 for limiting the floating amount of the three lower punches 360 relative to the third punch plate seat 350. The upper limit position of the floating of the three lower punches 360 is the powder filling position of the mold structure, and the lower limit position of the floating of the three lower punches 360 is the fixed position of the third punch plate seat 350. The floating amount of the three lower punches 360 relative to the third punch plate seat 350 is designed according to the powder filling amount of the mold structure. The middle part of the limit block 370 is a stepped third through hole, and the lower part of the three lower punches 360 is a stepped structure corresponding to the third through hole. The lower part of the three lower punches 360 is embedded in the third through hole and can move relative to the limit block 370. The core rod 500 drives the three lower punches 360 to move upward relative to the third punch plate seat 350 through the spring 400, and the upward movement range of the three lower punches 360 can be limited by the limit block 370.

[0039] With the above structure, the position of the lower punch 320 remains unchanged during the entire forming process. First, the positions of the die 200, the second lower punch 340 and the third lower punch 360 should be adjusted according to the size of the workpiece 600 to be formed, that is, the extension length of the top of the second lower punch 340 and the third lower punch 360 relative to the lower punch 320 should be adjusted.

[0040] like Figure 2 As shown, before filling powder, first adjust the position of the die 200 relative to the lower punch 320 according to the size of the workpiece 600 to be formed and the position of the lower punch 320; then, the core rod 500 moves upward to compress the spring 400, and the spring 400 is compressed to drive the three lower punches 360 to move upward along the core rod 500, and the three lower punches 360 are limited to a suitable position by the limit block 370. At the same time, the second lower punch 340 follows the second punch plate seat 330 to move to a suitable position, and the lower punch 320, the second lower punch 340 and the third lower punch 360 cooperate with the inner wall of the die 200 to form a cavity of the workpiece 600 to be formed. During the powder filling process, the positions of the die 200, the second lower punch 340 and the third lower punch 360 remain unchanged. After the powder filling is completed, the upper punch 110 moves downward. During the pressing process, as shown in Figure 3As shown, the downward pressure of the upper punch 110 is greater than the upward pressure of the core rod 500, forcing the upper punch 110 to contact the powder in the cavity and move downward together to the molding position of the workpiece 600 to be molded. During this process, the positions of the concave mold 200, the second lower punch 340 and the third lower punch 360 will all float downward, and the downward floating amount of the three can be controlled to ensure the molding quality of the workpiece 600 to be molded. Through this molding method, the workpiece 600 to be molded can be directly molded without subsequent mechanical processing, reducing material waste.

[0041] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0042] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A mold structure, characterized in that: include: A lower punch mechanism, comprising a first punch plate seat, a second punch plate seat and a third punch plate seat, wherein the first punch plate seat, the second punch plate seat and the third punch plate seat are arranged in sequence from top to bottom, the first punch plate seat and the third punch plate seat are fixedly mounted on a fixed template, the second punch plate seat is mounted on a floating template and can float relative to the fixed template, a lower punch is fixedly connected to the upper portion of the first punch plate seat, two lower punches are fixedly connected to the upper portion of the second punch plate seat, and three lower punches are arranged on the upper portion of the third punch plate seat and can float relative to the third punch plate seat, and the upper portions of the lower punch and the three lower punches form a cavity for the upper portions of the two lower punches to pass through; An upper punch mechanism, comprising an upper punch that can move up and down, and the upper punch is arranged toward one side of the lower punch mechanism; The concave die is arranged between the upper punch mechanism and the lower punch mechanism, the concave die can float relative to the fixed template, and a first through hole for the upper punch and the lower punch mechanism to pass through is arranged in the middle of the concave die.

2. A mold structure according to claim 1, characterized in that: The side of the upper punch facing the die is arranged in a stepped shape matching the step of the workpiece to be formed.

3. A mold structure according to claim 2, characterized in that: The upper parts of the first lower punch, the second lower punch and the third lower punch all extend into the first through hole, and cooperate with the inner wall of the die to form a cavity of the workpiece to be formed.

4. A mold structure according to any one of claims 1 to 3, characterized in that: It also includes a core rod, the upper part of which is mounted on the inner side of the lower part of the three lower punches, and a spring is mounted on the outer side of the upper part of the core rod. A second through hole is provided in the middle part of the third punch seat for the spring and the upper part of the core rod to pass through; the lower part of the core rod extends radially outward to form an annular boss, one end of the spring abuts against the annular boss, and the other end abuts against the bottom end of the three lower punches.

5. A mold structure according to claim 4, characterized in that: The third punch plate seat is also fixedly connected with a limit block for limiting the floating amount of the three lower punches relative to the third punch plate seat.

6. A mold structure according to claim 5, characterized in that: The middle part of the limit block is a stepped third through hole, the lower part of the three punches is a stepped structure corresponding to the third through hole, the lower part of the three punches is embedded in the third through hole and can move relative to the limit block, and the limit block limits the upward movement range of the three punches.

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