CN213614132U

CN213614132U - Split die device

Info

Publication number: CN213614132U
Application number: CN202022454560.8U
Authority: CN
Inventors: 袁彩云; 冯文; 何莹; 何海军
Original assignee: Zhuzhou Cemented Carbide Cutting Tools Co Ltd
Current assignee: Zhuzhou Cemented Carbide Cutting Tools Co Ltd
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2021-07-06
Anticipated expiration: 2030-10-29

Abstract

The utility model discloses a split die device, including die body, top punch, lower punch and side punch group, side punch group is including many offside punches, is equipped with the centre bore on the die body and follows a plurality of guide ways that centre bore circumference was arranged, the guide way with the centre bore communicates with each other, and the quantity of guide way is the same with the side punch, and every side punch is mobilizable locate the corresponding guide way in, every to two side punches mutual dispositions, and the side punch is the side profile towards the face of centre bore, has the side profile of a offside punch to be equipped with the protruding mesa of hole shaping on the side profile of a offside punch. The utility model discloses a plurality of side pressure drifts have realized suppressing in the side direction, have improved the compactness of pressed compact and the homogeneity of the whole density of pressed compact greatly to, change the mode in traditional upper and lower shaping hole into the shaping hole in the side direction, be applicable to the shaping product that the side direction has the recess, reduced the deformation of shaping product recess, make the side formation face into complicated shape, realize the suppression of complicated pressed compact.

Description

Split die device

Technical Field

The utility model relates to a powder metallurgy technique especially relates to a components of a whole that can function independently mould device.

Background

In the powder metallurgy technology, the powder forming process is the most important process in the production of numerical control blades. Generally, powder molding uses a device consisting of a die body, upper and lower punches and a core rod. The device relies on the force exerted on the powder by the upper and lower punches to compact the powder into a shaped compact. At present, the commonly adopted forming process can only aim at the product with a groove-shaped structure in the product demoulding direction, but cannot realize the product structure with the groove shape in the direction perpendicular to the demoulding direction, along with the development of the powder metallurgy forming technology, the technical upgrade of powder forming press equipment is promoted, advanced equipment such as side pressure pressing, a multilayer die carrier and the like is brought out, and a larger space is created for the design of a die structure of a product with a complex structure.

In the prior art, the forming die mainly comprises an upper punch, a lower punch and a die body for forming and pressing, but a subsequent peripheral grinding process is required. However, an advanced upper and lower die parting technology is available, wherein a forming die comprises an upper punch, a lower punch, an upper die body and a lower die body which move up and down along the axial direction, the upper die body and the lower die body are jointed to form a powder die cavity, the upper punch and the lower punch move in the middle of the die bodies to be pressed and formed, and the device can solve the technical problem that a pressed blank of the traditional compression molding device cannot be demolded. However, the die device requires a large stroke of the press to meet the moving space of the opening and closing die of the upper die body and the lower die body, in addition, the powder filling process also needs to be specially designed to be optimized, the whole pressing process is relatively complex in the moving position relation of the upper punch and the lower punch and the upper die body, the requirement on the manufacturing precision of the die is higher, and therefore, the die manufacturing cost is higher and the pressing efficiency is lower.

The die structure and the die are relatively simple to manufacture, have no special requirements on the stroke and the filling mode of a press, can realize one-step forming of a product, and do not need subsequent processing.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome prior art not enough, provide a good and simple structure's of homogeneity split die set of the whole density of pressed compact.

In order to solve the technical problem, the utility model discloses a following technical scheme:

the utility model provides a split die device, includes die body, upper punch, lower punch and side punch group, side punch group includes many offsides punches, be equipped with the centre bore on the die body and along a plurality of guide ways of centre bore circumference arrangement, the guide way with the centre bore communicates with each other, the quantity of guide way is the same with the side punch, and every side punch is mobilizable to be located corresponding guide way, and every two side punches of pair are arranged relatively, the side punch is towards the face of centre bore for the side profiled surface, has the side profiled surface of a offside punch to be equipped with the protruding mesa of hole shaping.

As a further improvement of the above technical solution:

the upper end of the hole forming convex table surface of the side forming surface is provided with an upper cutting back angle surface, the lower end of the hole forming convex table surface is provided with a lower cutting back angle surface, an included angle alpha is formed between the upper cutting back angle surface and the side forming surface, an included angle beta is formed between the lower cutting back angle surface and the side forming surface, the upper cutting back angle surface and the lower cutting back angle surface are arranged on the same side of the side forming surface, and both alpha and beta are acute angles.

The width of side profile surface is less than the width of the side drift side of side profile surface both sides, be equipped with the transition inclined plane between side profile surface and the side drift side, be equipped with the transition arc surface between side profile surface and the transition inclined plane, the transition inclined plane of two adjacent side drifts is parallel, and the side profile surface and the transition arc surface of each side drift can enclose into the closed surface in the centre bore.

The face of the upper punch towards the center hole is an upper forming face, the upper forming face comprises an upper forming convex face and a first upper concave face and a second upper concave face which are positioned on two sides of the upper forming convex face, and the depth of the first upper concave face is greater than that of the second upper concave face.

The face of the lower punch towards the center hole is a lower forming face, the lower forming face comprises a lower forming convex face, a first lower concave face and a second lower concave face, the first lower concave face is located on two sides of the lower forming convex face, and the depth of the first lower concave face is smaller than that of the second lower concave face.

The height of the side punch is the same as the depth of the guide groove, the side punch and the guide groove are in clearance fit, and the clearance range is 0.005 mm-0.01 mm.

The height of the powder filler is H1, the height of the side punch is H2, H2 is more than H1, the distance between the initial position of the lower punch and the upper end face of the side punch is H1, the height between the hole forming boss surface of the side punch and the initial position of the lower punch is H3, and H3 is more than 0.

Compared with the prior art, the utility model has the advantages of:

(1) the utility model discloses a powder forming device has realized suppressing in the side direction through a plurality of side pressure drifts, has improved the compactness of pressed compact and the homogeneity of the whole density of pressed compact greatly to, change the mode in traditional upper and lower shaping hole into the side direction shaping hole, be applicable to the shaping product that the side direction has the recess, reduced the deformation of shaping product recess, the side direction only has the punching press, does not have the drawing of patterns to get the action of pressed compact, can make the side shaping face into complicated shape with the suppression out complicated pressed compact. The split die device is only provided with the upper punch, the lower punch, the side punches and the die body, has simple structure, is easy to operate in the forming method, and can realize the pressing of complex pressed compacts by matching the side punches of each group.

(2) The utility model discloses a powder forming device, side profile face are equipped with last cutting back angle face in the upper end of the protruding mesa of hole shaping, are equipped with down cutting back angle face in the lower extreme of the protruding mesa of hole shaping, can realize the one shot forming of the complicated shape pressed compact that has last cutting relief angle and lower cutting relief angle through the side direction extrusion, and follow-up product need not to carry out peripheral grinding process again.

Drawings

Fig. 1 is a schematic structural diagram of the split mold apparatus of the present invention.

Fig. 2 is a schematic structural diagram of the mold body of the present invention.

Fig. 3 is a schematic structural view of the middle punch according to the present invention.

Fig. 4 is a schematic diagram of the positions of the upper punch, the lower punch and the side punch before pressing in the present invention.

Fig. 5 is a schematic diagram of the positions of the upper punch, the lower punch and the side punch after pressing according to the present invention.

Fig. 6 is a schematic structural view of the upper punch of the present invention.

Fig. 7 is a schematic structural diagram of the middle and lower punches of the present invention.

Fig. 8 is a schematic structural view of the side forming surface of the middle punch according to the present invention.

Fig. 9 is a schematic view of the closing surface surrounded by the side punches in the present invention.

Fig. 10 is a schematic view of the abutting state between two adjacent side punches in the present invention.

Fig. 11 is a schematic structural diagram of the green compact of the present invention.

Fig. 12 is a schematic view of the stress of the green compact during molding according to the present invention.

The reference numerals in the figures denote:

100. a mold body; 110. a central bore; 120. a guide groove; 200. an upper punch; 210. forming a molding surface; 211. forming a convex surface; 212. a first upper concave surface; 213. a second upper concave surface; 300. a lower punch; 310. a lower molding surface; 311. a lower molding convex surface; 312. a first lower concave surface; 313. a second lower concave surface; 400. a side punch; 410. a side forming surface; 411. forming a convex table surface by using holes; 412. cutting a rear corner surface; 413. lower cutting back corner surface; 420. a side punch side; 430. a transition bevel; 440. a transitional arc surface; 500. filling the cavity with powder; 800. pressing into a blank; 801. and (7) installing holes.

Detailed Description

The invention is described in further detail below with reference to the drawings and specific examples.

As shown in fig. 1 to 11, the split die device of the present embodiment includes a die body 100, an upper punch 200, a lower punch 300, and a side punch set, where the side punch set includes a plurality of pairs of side punches 400, the die body 100 is provided with a central hole 110 and a plurality of guide grooves 120 arranged along the circumferential direction of the central hole 110, the guide grooves 120 are communicated with the central hole 110, the number of the guide grooves 120 is the same as that of the side punches 400, each side punch 400 is movably arranged in the corresponding guide groove 120, two side punches 400 of each pair are arranged oppositely, and the surface of the side punch 400 facing the central hole 110 is a side forming surface 410.

The present embodiment takes two pairs of side punches 400 as an example. The upper punch 200, the lower punch 300, and the four side punches 400 all have separate driving powers.

To distinguish from the other side punches 400, the side punch 400 demarcating the hole forming boss face 411 is a side punch 400 a. In operation, the four side punches 400 move in the guide grooves 120 toward the center hole 110, the side forming surfaces 410 of the side punches 400 in the center hole 110 define a closed surface, the lower punch 300 is raised into the center hole 110 during powder filling, the closed surface and the lower punch 300 define a powder filling chamber 500 therebetween, the powder filling chamber 500 is filled with the powder, the upper punch 200 and the lower punch 300 are then pressed against each other, the two side punches 400 in each pair are pressed against each other, the green compact 800 is finally formed, and the hole forming boss surfaces 411 of the two side punches 400a form the mounting holes 801 of the green compact 800 during pressing against each other (the hole forming boss surfaces 411 of the two side punches 400a abut against each other during filling). This split die device has realized suppressing in the side direction through a plurality of side pressure drift 400, has improved the compactness of pressed compact 800 and the homogeneity of pressed compact bulk density greatly to, change the mode of traditional upper and lower shaping hole into the shaping hole in the side direction, be applicable to the side direction and have the shaping product of recess, reduced the deformation of shaping product recess, the side direction only has the punching press, does not have the action of drawing of patterns and getting the pressed compact, can make complicated shape with side shaping face 410 and press out complicated pressed compact. The split die device is only provided with the upper punch 200, the lower punch 300, the side punches 400 and the die body 100, has simple structure, is easy to operate in the forming method, and can realize the pressing of complex pressed compacts by matching all groups of side punches.

In this embodiment, the side forming surface 410 of the side punch 400a is provided with an upper cutting back corner surface 412 at the upper end of the hole forming boss surface 411, a lower cutting back corner surface 413 at the lower end of the hole forming boss surface 411, an included angle α is formed between the upper cutting back corner surface 412 and the side forming surface 410, an included angle β is formed between the lower cutting back corner surface 413 and the side forming surface 410, the upper cutting back corner surface 412 and the lower cutting back corner surface 413 are on the same side of the side forming surface 410, and both α and β are acute angles. By providing the upper and

lower relief surfaces

412 and 413, the green compact 800 having a complicated shape with the upper and lower relief angles is directly formed without subsequent machining, so that the green compact 800 can be formed without performing a peripheral grinding process.

In this embodiment, the surface of the upper punch 200 facing the central hole 110 is an upper molding surface 210, the upper molding surface 210 includes an upper molding convex surface 211 and a first upper concave surface 212 and a second upper concave surface 213 located on both sides of the upper molding convex surface 211, and the depth of the first upper concave surface 212 is greater than that of the second upper concave surface 213. Similarly, the surface of the lower punch 300 facing the central hole 110 is a lower forming surface 310, the lower forming surface 310 includes a lower forming convex surface 311 and a first lower concave surface 312 and a second lower concave surface 313 located on both sides of the lower forming convex surface 311, and the depth of the first lower concave surface 312 is smaller than that of the second lower concave surface 313. With the above arrangement, the pressed compact 800 has an upper groove 802 and a lower groove 803.

Since the upper chamfer face 412 and the lower chamfer face 413 are present and the side pressure of the side punches 400a is small by using the side pressure mounting holes 801, as shown in fig. 12, the side pressure mounting holes 801 are formed by using the side punches in the present embodiment and the side pressure F2 is smaller than the upper and lower pressures F1, so that the press deformation of the upper chamfer face 412 and the lower chamfer face 413 is small and a complicated groove profile can be effectively pressed by using the present embodiment.

In this embodiment, the width of the side forming surface 410 is smaller than the width of the side punch side surfaces 420 at both sides of the side forming surface 410, a transition inclined surface 430 is arranged between the side forming surface 410 and the side punch side surfaces 420, a transition arc surface 440 is arranged between the side forming surface 410 and the transition inclined surface 430, the transition inclined surfaces 430 of two adjacent side punches 400 are parallel, and the side forming surface 410 and the transition arc surface 440 of each side punch 400 can form a closed surface in the central hole 110.

During operation, in the central hole 110, the side forming surface 410 and the transition arc surface 440 of each side punch 400 enclose a closed surface, a round angle is formed between two adjacent surfaces of the closed surface, the transition inclined surfaces 430 of two adjacent side punches 400 are attached to ensure that two adjacent transition arc surfaces 440 are seamlessly joined to form the round angle, as shown in fig. 9, the closed surface is a side surface of the pressed compact 800, when powder is filled, the lower punch 300 rises to enter the central hole 110, the powder filling cavity 500 is enclosed between the closed surface and the lower punch 300, the powder filling cavity 500 is filled with the powder, then the upper punch 200 and the lower punch 300 are subjected to opposite punching, each pair of two side punches 400 perform opposite punching, and the pressed compact 800 is finally formed. The arc chamfers (formed by splicing two adjacent transitional arc surfaces 440) are directly formed between two connected side surfaces of the pressed blank 800, and the process of machining after forming is omitted, so that the pressed blank 800 can be formed without peripheral grinding process, and particularly, the pressed blank is directly opposite to a blade with complex machining process and high precision requirement, and the machining efficiency is greatly improved and the product quality is improved through one-step forming.

In this embodiment, two transition inclined planes 430 of each side punch form a V-shaped surface, and the adjacent V-shaped surfaces are overlapped at any point of the pressed compact 800, so that redundant burrs are not generated, the pressed compact 800 with various different cross sections can be guaranteed to be pressed, the precision control on the pressed compact 800 is good, and the number of the burrs is small.

In this embodiment, the width of the side punch 400 in the guide groove 120 is a constant width, the height of the side punch 400 is the same as the depth of the guide groove 120, and the side punch 400 and the guide groove 120 are in clearance fit, and the clearance range is 0.005mm to 0.01mm (including two end points). In this embodiment, the gap is 0.005mm to minimize the powder flowing into the gap between the side punch 400 and the guide groove 120, so as to avoid the occurrence of the die sticking phenomenon and facilitate easy movement of the side punch 400.

The powder forming method using the split mold device of the embodiment specifically includes the following steps:

s1, filler: the upper punch 200 moves to the upper part of the central hole 110, each side punch 400 moves to be close to the central hole 110 along the guide groove 120, the lower punch 300 extends into the central hole 110 and is close to each side punch 400, a powder filling cavity 500 is defined by the side forming surface 410 of each side punch 400, the transition arc surface 440 and the lower punch 300, and the two hole forming boss surfaces 411 are abutted with each other to perform powder filling on the powder filling cavity 500;

s2, pressing: the upper punch 200 and the lower punch 300 move towards each other to reach a set position for pressing, the punches 400 on each side move towards the central hole 110 to reach the set position for pressing, and the powder is co-extruded to be formed, so that a compact 800 is formed;

s3, demolding: each side punch 400 is retreated in a direction away from the center through hole, the upper punch 200, the compact 800, and the lower punch 300 are raised together away from the center hole 110, the upper punch 200 is further raised away from the compact 800 to remove the compact 800, and thereafter, the upper punch 200 and the lower punch 300 are returned to the initial positions, respectively.

In the present embodiment, as shown in fig. 4, in step S1, the height of the powder filling is H1, the height of the side punch 400 is H2, H2 > H1, and the distance H1 between the initial position of the lower punch 300 and the upper end face of the side punch 400, that is, the lower punch 300 is to be raised into the closed face of the side punch 400, and the lower forming face 310 and the closed face enclose a semi-closed powder filling cavity 500 to prevent powder leakage. The height between the hole-forming land 411 of the side punch 400 and the initial position of the lower punch 300 is H3, H3 > 0, ensuring no interference between the hole-forming land 411 and the lower punch 300.

In this embodiment, the moving speed and the acting time of the upper punch 200, the lower punch 300 and the side punch 400 can be controlled, which is beneficial to adjusting the density uniformity of the compact 800 to ensure the dimensional accuracy of the product.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The technical solution of the present invention can be used by anyone skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, without departing from the scope of the technical solution of the present invention, using the technical content disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.

Claims

1. The split die device is characterized by comprising a die body (100), an upper punch (200), a lower punch (300) and a side punch group, wherein the side punch group comprises a plurality of pairs of side punches (400), a central hole (110) and a plurality of guide grooves (120) which are arranged along the circumferential direction of the central hole (110) are formed in the die body (100), the guide grooves (120) are communicated with the central hole (110), the number of the guide grooves (120) is the same as that of the side punches (400), each side punch (400) is movably arranged in the corresponding guide groove (120), each pair of two side punches (400) are arranged oppositely, the surface, facing the central hole (110), of each side punch (400) is a side forming surface (410), and a hole forming convex table surface (411) is formed on the side forming surface (410) of one pair of side punches (400).

2. The split mold device according to claim 1, wherein the side molding surface (410) is provided with an upper cut back corner surface (412) at the upper end of the hole molding boss surface (411), and a lower cut back corner surface (413) at the lower end of the hole molding boss surface (411), the upper cut back corner surface (412) and the side molding surface (410) form an included angle α, the lower cut back corner surface (413) and the side molding surface (410) form an included angle β, the upper cut back corner surface (412) and the lower cut back corner surface (413) are on the same side of the side molding surface (410), and α and β are acute angles.

3. The split die device according to claim 1, wherein the width of the side forming surface (410) is smaller than the width of the side punch side surface (420) on both sides of the side forming surface (410), a transition inclined surface (430) is arranged between the side forming surface (410) and the side punch side surface (420), a transition arc surface (440) is arranged between the side forming surface (410) and the transition inclined surface (430), the transition inclined surfaces (430) of two adjacent side punches (400) are parallel, and the side forming surface (410) and the transition arc surface (440) of each side punch (400) can enclose a closed surface in the central hole (110).

4. The split die device as claimed in claim 1, wherein the face of the upper punch (200) facing the central hole (110) is an upper forming face (210), the upper forming face (210) comprises an upper forming convex surface (211) and first and second upper concave surfaces (212, 213) located at both sides of the upper forming convex surface (211), and the depth of the first upper concave surface (212) is greater than that of the second upper concave surface (213).

5. The split die apparatus according to claim 4, wherein the surface of the lower punch (300) facing the central hole (110) is a lower molding surface (310), the lower molding surface (310) comprises a lower molding convex surface (311) and a first lower concave surface (312) and a second lower concave surface (313) which are positioned at both sides of the lower molding convex surface (311), and the depth of the first lower concave surface (312) is smaller than that of the second lower concave surface (313).

6. The split mold device according to any one of claims 1 to 5, wherein the height of the side punch (400) is the same as the depth of the guide groove (120), and the side punch (400) and the guide groove (120) are in clearance fit, and the clearance is in the range of 0.005mm to 0.01 mm.

7. The split die apparatus according to any one of claims 1 to 5, wherein the powder filler has a height of H1, the side punch (400) has a height of H2, H2 > H1, the distance H1 between the initial position of the lower punch (300) and the upper end face of the side punch (400), and the height between the hole-forming boss face (411) of the side punch (400) and the initial position of the lower punch (300) is H3, H3 > 0, based on the upper end face of the side punch (400).