A pressing device and pressing method for a compact with internal cooling holes

Abstract

The invention discloses a pressing device and a pressing method for a pressed blank with an inner cooling hole. The pressing device comprises a main mold body, a punch, an ejector, two inclined slide blocks and two side slide blocks. The main mold body is provided with a central through hole, and the punch and the ejector can both move up and down in the central through hole. Radial guide grooves are provided on both left and right sides of the middle of the main mold body, and the two side slide blocks are respectively installed in the two radial guide grooves and can move radially. An inclined guide groove is provided on the top of the main mold body, and the two inclined slide blocks are both installed in the inclined guide grooves and can move obliquely. A through hole is provided in the ejector, and a core rod is provided in the through hole, and the core rod can move up and down in the through hole. The punch, the ejector, the core rod, the two inclined slide blocks and the two side slide blocks can jointly form a pressed blank forming cavity. A pin hole is provided on the inclined slide block, and a pin is installed in the pin hole, which can move obliquely to the front end to contact the core rod at the pressed blank forming cavity. The pressing method adopts the above device, including filling, pressing and demoulding, etc., and has good forming quality and is stable and reliable.

Description

Technical Field

[0001] The invention mainly relates to the field of metal cutting tool manufacturing, and in particular to a pressing device and a pressing method for a compact with an inner cooling hole. Background Art

[0002] The molding process is the most operational process in cemented carbide production. At present, the commonly used compression molding process can only be used to press products without internal coolant holes, but cannot be used to press products with internal coolant holes, resulting in the difficulty and high cost of making tools with internal coolant holes, and poor molding quality. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and to provide a stable, reliable, easy-to-operate, good-forming quality pressing device for a pressed billet with an inner cooling hole and a good-forming quality, high-efficiency pressing method for a pressed billet with an inner cooling hole.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A pressing device for a blank with an internal cooling hole comprises a main mold body, a punch, an ejector, two inclined slide blocks and two side slide blocks, wherein the main mold body is provided with a central through hole, wherein the punch and the ejector can both move up and down in the central through hole, radial guide grooves are provided on both the left and right sides of the middle part of the main mold body, wherein the two side slide blocks are respectively installed in the two radial guide grooves and can move radially, an inclined guide groove is provided on the top of the main mold body, wherein the two inclined slide blocks are both installed in the inclined guide grooves and can move obliquely, a through hole is provided in the ejector, wherein a core rod is provided in the through hole, wherein the core rod can move up and down in the through hole, wherein the punch, the ejector, the core rod, the two inclined slide blocks and the two side slide blocks can jointly form a blank forming cavity, wherein a pin inserting hole is provided on the inclined slide block, wherein a pin inserting hole is installed, wherein the pin inserting hole can move obliquely to the front end to contact the core rod at the blank forming cavity.

[0006] As a further improvement of the above technical solution:

[0007] A power sliding mechanism is provided above the two inclined sliding blocks, which is connected to the two inclined sliding blocks and can apply pressure or tension to the inclined sliding blocks to make the inclined sliding blocks move obliquely in the inclined guide grooves. An avoidance through hole is provided in the middle of the power sliding mechanism to facilitate the up and down movement of the punch.

[0008] Two inclined guide grooves are provided on two opposite and parallel guide surfaces of the inclined guide groove, and two guide convex strips cooperating with the guide grooves are correspondingly arranged on the two inclined sliding blocks.

[0009] Two slide grooves are arranged on the top of the inclined sliding block, and the two slide grooves are respectively matched with two guide strips arranged horizontally on both sides of the bottom of the power sliding mechanism.

[0010] The side walls of the two radial guide grooves are both provided with radial grooves, and the two side sliding blocks are both correspondingly provided with radial guide bars matched with the radial grooves.

[0011] The top of the core rod is conical.

[0012] The inlay pin is made of high carbon steel.

[0013] A method for pressing a compact with an inner cooling hole, using the above-mentioned pressing device for a compact with an inner cooling hole, comprises the following steps:

[0014] S1, packing: First, the punch, the ejector, the core rod, the two inclined sliders and the two side sliders are all moved to the initial position of the packing to form a packing cavity. At this time, the insert pin has moved with the side slider to the front end of the insert pin and is placed in the packing cavity and in contact with the core rod;

[0015] S2, pressing: the punch moves downward and the ejector moves upward to the pressing position. At this time, the punch, the ejector, two inclined slides, two side slides and the insert pin form a pressing cavity for powder molding to form a compact;

[0016] S3. Demolding: The two side sliders return to their initial positions along the radial direction, the two inclined sliders return to their initial positions along the inclined guide grooves and drive the insert pins to be ejected from the compact, the core rod moves downward and returns to its initial position, the punch and the ejector move upward at the same time until the compact is ejected, and the punch and the ejector return to their initial positions.

[0017] As a further improvement of the above technical solution:

[0018] The moving speed and acting force of the punch, the ejector, the core rod, the two inclined slide blocks and the two side slide blocks can be adjusted.

[0019] The initial position of the ejector is when the ejector moves to the vicinity of the upper end of the oblique sliding block. At this time, the height difference H between the two in the vertical direction satisfies: 1mm≤H≤2mm.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] (1) The pressing device of the blank with an internal cooling hole of the present invention comprises a punch, an ejector, a core rod, two inclined slide blocks and two side slide blocks which together form a blank forming cavity. The punch, the ejector, the core rod, the two inclined slide blocks and the two side slide blocks can be moved independently, which is convenient for filling, pressing and demolding. The operation is simple and can improve the forming density of different areas of the blank. The forming quality is good. A pin hole is provided on the inclined slide block. A pin is installed in the pin hole which can be moved obliquely to the front end to contact the core rod at the blank forming cavity. The front end of the pin enters the blank forming cavity and contacts the core rod, so that the forming of the internal cooling hole can be realized. In addition, the internal cooling holes of different structures can be formed by adjusting the structure of the core rod and the structure and angle of the pin. The device is stable and reliable, easy to operate and greatly reduces the manufacturing cost of the tool for the internal cooling hole.

[0022] (2) The pressing method of the blank with internal cooling holes of the present invention is realized by the pressing device of the blank with internal cooling holes of the present invention. First, powder filling is performed, then pressing is performed, and finally demolding is performed. The entire operation process only requires moving the punch, the ejector, the core rod, the two inclined slides, the two side slides and the insert pin, so that the forming of the blank with internal cooling holes can be achieved. The operation is simple and reliable, the forming quality is good, and the efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of a pressing device for a blank with an internal cooling hole according to the present invention.

[0024] Figure 2 It is a three-dimensional structural diagram of the main mold body of the pressing device of the blank with internal cooling hole of the present invention.

[0025] Figure 3 It is a three-dimensional structural diagram of the inclined slide block of the pressing device for pressing blanks with internal cooling holes of the present invention.

[0026] Figure 4 It is a three-dimensional structural diagram of the side slide block of the pressing device for pressing blanks with internal cooling holes of the present invention.

[0027] Figure 5 It is a three-dimensional structural diagram of the ejector of the pressing device for the compact with internal cooling holes of the present invention.

[0028] Figure 6 It is a three-dimensional structure diagram of the pressed green body.

[0029] Figure 7 It is a schematic diagram of the filling process of the pressing method of the compact with internal cooling holes of the present invention.

[0030] Figure 8 It is a schematic diagram of the pressing process of the pressing method of the blank with internal cooling hole of the present invention.

[0031] Fig. 9 It is a schematic diagram of the demoulding process of the pressing method of the blank with internal cooling hole of the present invention.

[0032] The symbols in the figure represent:

[0033] 1. Main mold body; 11. Center through hole; 12. Radial guide groove; 121. Radial groove; 13. Inclined guide groove; 131. Guide surface; 132. Guide groove; 2. Punch; 3. Ejector; 31. Through hole; 4. Inclined slider; 41. Guide rib; 42. Slide groove; 43. Pin hole; 5. Side slider; 51. Radial guide strip; 6. Blank forming cavity; 7. Pin; 8. Power sliding mechanism; 81. Guide strip; 9. Core rod; 10. Blank. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] In the description of the present invention, it should be noted that terms such as "center", "up", "down", "horizontal", "inside", "outside", "top", and "bottom" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They 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 direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0036] Figures 1 to 5An embodiment of a pressing device for a pressed blank with an inner cooling hole of the present invention is shown. The pressing device for a pressed blank with an inner cooling hole of the embodiment comprises a main mold body 1, a punch 2, an ejector 3, two inclined slide blocks 4 and two side slide blocks 5. A central through hole 11 is provided on the main mold body 1. Both the punch 2 and the ejector 3 can move up and down in the central through hole 11. Radial guide grooves 12 are provided on both the left and right sides of the middle of the main mold body 1. The two side slide blocks 5 are respectively installed in the two radial guide grooves 12 and can move radially. An inclined guide groove 13 is provided on the top of the main mold body 1. Both the two inclined slide blocks 4 are installed in the inclined guide grooves 13 and can move obliquely. A through hole 31 is provided in the ejector 3. A core rod 9 is provided in the through hole 31. The core rod 9 can move up and down in the through hole 31. The punch 2, the ejector 3, the core rod 9, the two inclined slide blocks 4 and the two side slide blocks 5 can jointly form a pressed blank forming cavity 6. A pin hole 43 is provided on the inclined slide block 4. A pin inserting hole 43 is provided with a pin inserting hole 7 which can be moved obliquely to the front end to contact the core rod 9 at the blank forming cavity 6. The punch 2, the ejector 3, the core rod 9, the two oblique sliders 4 and the two side sliders 5 can jointly form the blank forming cavity 6. The punch 2, the ejector 3, the core rod 9, the two oblique sliders 4 and the two side sliders 5 can all be moved individually, which is convenient for filling, pressing and demolding. The operation is simple, and the molding density of different areas of the blank can be improved, and the molding quality is good. A pin inserting hole 43 is provided on the oblique slider 4. A pin inserting hole 43 is provided with a pin inserting hole 7 which can be moved obliquely to the front end to contact the core rod 9 at the blank forming cavity 6. The front end of the pin inserting needle 7 enters the blank forming cavity and contacts the core rod 9, so as to realize the molding of the inner cooling hole. In addition, the structure of the core rod 9 and the structure and angle of the pin inserting needle 7 can be adjusted, which is stable and reliable, easy to operate, and greatly reduces the manufacturing cost of the inner cooling hole tool.

[0037] The structure of the pressed green sheet formed by the pressing device with inner cooling hole in this embodiment is as follows: Figure 6 shown.

[0038] In this embodiment, a power sliding mechanism 8 is provided above the two inclined sliding blocks 4. The power sliding mechanism 8 is connected to the two inclined sliding blocks 4 and can apply pressure or tension to the inclined sliding blocks 4 to make the inclined sliding blocks 4 move obliquely in the inclined guide groove 13. An avoidance through hole is provided in the middle of the power sliding mechanism 8 to facilitate the up and down movement of the punch 2. The power sliding mechanism 8 is provided to drive the movement of the inclined sliding blocks 4, thereby improving the stability of pressing and demolding and improving the molding quality.

[0039] In this embodiment, two inclined guide grooves 132 are provided on the two relative and parallel guide surfaces 131 of the inclined guide groove 13, and two corresponding guide ridges 41 cooperating with the guide grooves 132 are provided on the two inclined sliding blocks 4. The up and down movement of the inclined sliding blocks 4 is more stable and smooth, which improves the molding quality and prevents the inclined sliding blocks 4 from bending due to force during pressing, thereby ensuring the burr width of the blank 10.

[0040] In this embodiment, two slide grooves 42 are provided on the top of the inclined sliding block 4, and the two slide grooves 42 are respectively matched with the two guide strips 81 horizontally arranged on both sides of the bottom of the power sliding mechanism 8. The inclined sliding block 4 moves up and down under the drive of the power sliding mechanism 8, and moves horizontally relative to the power sliding mechanism 8, thereby realizing mold opening and closing.

[0041] In this embodiment, radial grooves 121 are provided on the side walls of the two radial guide grooves 12, and radial guide bars 51 cooperating with the radial grooves 121 are correspondingly provided on the two side sliders 5. The radial movement of the side sliders 5 is stable and reliable, and the side sliders 5 are prevented from bending due to force during pressing, thereby ensuring the burr width of the blank 10.

[0042] In this embodiment, the top of the core rod 9 is conical, which facilitates the demoulding of the core rod 9 from the green compact 10.

[0043] In this embodiment, the insert pin 7 is made of high carbon steel material, which has good toughness and is resistant to bending, thereby ensuring the molding quality of the cooling hole in the blank 10.

[0044] The method for pressing a green compact with an inner cooling hole of the present invention adopts the pressing device for pressing a green compact with an inner cooling hole in the above embodiment, and comprises the following steps:

[0045] S1. Filling: First, the punch 2, the ejector 3, the core rod 9, the two inclined sliders 4 and the two side sliders 5 are all moved to the initial position of the filling to form a filling cavity. At this time, the insert pin 7 has moved with the side slider 5 until the front end of the insert pin 7 is placed in the filling cavity and contacts the core rod 9. Figure 7 As shown;

[0046] S2, pressing: the punch 2 moves downward and the ejector 3 moves upward to the pressing position. At this time, the punch 2, the ejector 3, the two inclined slides 4, the two side slides 5 and the insert pin 7 form a pressing cavity for powder molding to form a compact 10, such as Figure 8 As shown;

[0047] S3, demoulding: the two side sliders 5 return to their initial positions along the radial direction, the two inclined sliders 4 return to their initial positions along the inclined guide grooves 13 and drive the insert pins 7 to be removed from the pressed blank 10, as shown in FIG. Fig. 9 As shown, the core rod 9 moves downward to return to the initial position, the punch 2 and the ejector 3 move upward at the same time until the compact 10 is ejected, and the punch 2 and the ejector 3 return to the initial position.

[0048] The pressing device for the compact with inner cooling hole of the present invention is realized by first filling powder, then pressing and finally demolding. The whole operation process only requires moving the punch 3, the ejector 3, the core rod 9, the two inclined slides 4, the two side slides 5 and the insert pin 7, so that the forming of the compact with inner cooling hole can be realized. The operation is simple and reliable, the forming quality is good and the efficiency is high.

[0049] In this embodiment, the moving speed and force of the punch 2, the ejector 3, the core rod 9, the two inclined slides 4 and the two side slides 5 can be adjusted, which is convenient for filling, pressing and demolding, and is beneficial to the adjustment of the pressing parameters of the blank 10 to ensure the dimensional accuracy and quality of the product.

[0050] In this embodiment, the initial position of the ejector 3 is when the ejector 3 moves to the vicinity of the upper end of the inclined slider 4. At this time, the height difference H between the two in the vertical direction satisfies: 1mm≤H≤2mm, ensuring that the ejector 3 moves in the reverse direction due to the force.

[0051] Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the art can use the above disclosed technical content to make many possible changes and modifications to the technical solution of the present invention or modify it into an equivalent embodiment of equivalent changes without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A pressing device for a compact with an internal cooling hole, characterized in that: The invention comprises a main mold body (1), a punch (2), an ejector (3), two inclined slide blocks (4) and two side slide blocks (5); the main mold body (1) is provided with a central through hole (11); the punch (2) and the ejector (3) can both move up and down in the central through hole (11); radial guide grooves (12) are provided on both left and right sides of the middle of the main mold body (1); the two side slide blocks (5) are respectively installed in the two radial guide grooves (12) and can move radially; the top of the main mold body (1) is provided with an inclined guide groove (12) The two inclined slide blocks (4) are both mounted in the inclined guide groove (13) and can move obliquely. The ejector (3) has a through hole (31). A core rod (9) is disposed in the through hole (31). The core rod (9) can move up and down in the through hole (31). The punch (2), the ejector (3), the core rod (9), the two inclined slide blocks (4) and the two side slide blocks (5) can jointly form a blank forming cavity (6). The inclined slide block (4) is provided with a pin hole (43). The pin hole (43) A setting pin (7) is installed inside the punch (2) and can be moved obliquely to the front end to contact the core rod (9) at the blank forming cavity (6). A power sliding mechanism (8) is provided above the two oblique sliding blocks (4). The power sliding mechanism (8) is connected to the two oblique sliding blocks (4) and can apply pressure or tension to the oblique sliding blocks (4) to make the oblique sliding blocks (4) move obliquely in the oblique guide groove (13). An avoidance through hole is provided in the middle of the power sliding mechanism (8) to facilitate the up and down movement of the punch (2). The oblique guide groove Two inclined guide grooves (132) are respectively provided on two opposite and parallel guide surfaces (131) of the inclined guide groove (13), and two guide convex strips (41) cooperating with the guide grooves (132) are respectively provided on the two inclined sliding blocks (4). Two inclined guide grooves (132) are respectively provided on the two opposite and parallel guide surfaces (131) of the inclined guide groove (13), and two guide convex strips (41) cooperating with the guide grooves (132) are respectively provided on the two inclined sliding blocks (4).

2. The pressing device for a blank with an internal cooling hole according to claim 1, characterized in that: The side walls of the two radial guide grooves (12) are each provided with a radial groove (121), and the two side sliding blocks (5) are each correspondingly provided with a radial guide bar (51) that matches the radial groove (121).

3. The pressing device for a blank with an inner cooling hole according to claim 1 or 2, characterized in that: The top of the core rod (9) is conical.

4. The pressing device for a blank with an inner cooling hole according to claim 1 or 2, characterized in that: The inlay pin (7) is made of high carbon steel.

5. A method for pressing a green compact with an inner cooling hole, using the pressing device for pressing a green compact with an inner cooling hole according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Filling: First, the punch (2), the ejector (3), the core rod (9), the two inclined sliders (4) and the two side sliders (5) are all moved to the initial position of the filling to form a filling cavity. At this time, the insert pin (7) has moved with the side slider (5) to the point where the front end of the insert pin (7) is placed in the filling cavity and contacts the core rod (9); S2, pressing: the punch (2) moves downward and the ejector (3) moves upward to a pressing position. At this time, the punch (2), the ejector (3), the two inclined slides (4), the two side slides (5) and the insert pin (7) form a pressing cavity for powder molding to form a compact (10); S3, demoulding: the two side slide blocks (5) return to their initial positions in the radial direction, the two inclined slide blocks (4) return to their initial positions along the inclined guide grooves (13) and drive the insert pin (7) to be ejected from the pressed blank (10), the core rod (9) moves downward and returns to its initial position, the punch (2) and the ejector (3) simultaneously move upward until the pressed blank (10) is ejected, and the punch (2) and the ejector (3) return to their initial positions.

6. The method for pressing a green compact with an inner cooling hole according to claim 5, characterized in that: The moving speeds and acting forces of the punch (2), the ejector (3), the core rod (9), the two inclined slide blocks (4) and the two side slide blocks (5) are all adjustable.

7. The method for pressing a green compact with an inner cooling hole according to claim 6, characterized in that: The initial position of the ejector (3), i.e., the ejector (3) moves to the vicinity of the upper end of the inclined sliding block (4), at which time the height difference H between the two in the vertical direction satisfies: 1 mm ≤ H ≤ 2 mm.

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