Tool for nitriding secondary part of working tape of extrusion die and extrusion die

Abstract

The tool comprises a positioning block used for being positioned on the inner wall of the working tape, a shielding block used for shielding the inner wall of the working tape, a plier head, a plier handle, a rotating shaft and a spring, the plier head, the plier handle and the rotating shaft form a plier body capable of being opened and closed around the rotating shaft, the positioning block is fixedly arranged on one side of the plier head, and the shielding block is fixedly arranged on the other side of the plier head. The plurality of shielding blocks are fixed on the outer side surface of the clamp head at intervals in a block body shape with the same thickness, and the spring is arranged on the clamp handle in a manner of enabling the clamp head to be in an initial state of an open angle. The extrusion die is manufactured by carrying out secondary nitriding on the tool after primary nitriding, and stripes with the width consistent with the width of the shielding blocks or the distance between the shielding blocks are formed on the surface of the inner wall of the working tape. Therefore, the extruded aluminum alloy profile can form specific stripes, and the width of a single stripe is consistent with the width of the shielding blocks or the distance between the shielding blocks, so that the tracing of material information can be realized through the specific stripes.

Description

Technical Field

[0001] The utility model relates to the field of nitriding, and particularly relates to a tooling for secondary partial nitriding of the working belt of an extrusion die, and an extrusion die made by using the tooling. Background Art

[0002] After the aluminum alloy passes through the outlet part (corresponding to the "working belt") of the extrusion die, stripes will be formed on the surface of the aluminum alloy profile. The stripe patterns are inconsistent for each production, which makes it difficult to trace the information of some batch-produced aluminum alloy industrial materials. Content of the Utility Model

[0003] In order to solve the above problems, an object of the utility model is to provide a tooling for secondary partial nitriding of the working belt of an extrusion die, and an extrusion die made by using the tooling.

[0004] According to one aspect of the utility model, there is provided a tooling for secondary partial nitriding of the working belt of an extrusion die, including: a positioning block for positioning on the inner wall of the working belt, a shielding block for shielding the inner wall of the working belt, a clamp head, a clamp handle, a rotating shaft, and a spring. Among them, the clamp head, the clamp handle, and the rotating shaft form a clamp body that can open and close around the rotating shaft. The positioning block is fixedly arranged on one side of the clamp head, and a plurality of shielding blocks are fixedly arranged on the outer side surface of the clamp head at intervals in the shape of blocks with the same thickness. The spring is installed on the clamp handle in such a way that the clamp head is in an initial state of an open angle.

[0005] Preferably, a plurality of shielding blocks are fixedly arranged on the outer side surface of the clamp head at intervals in the shape of blocks with the same thickness and different widths.

[0006] Preferably, the tooling for secondary partial nitriding of the working belt of the extrusion die further includes a hook located on the clamp handle for installing the spring.

[0007] Preferably, the positioning block is used for positioning on the first inner wall of the working belt, that is, the inner wall in the short direction of the working belt.

[0008] Preferably, the shielding block is used for shielding the second inner wall of the working belt, that is, the inner wall in the long direction of the working belt of the extrusion die.

[0009] Preferably, the positioning block is fixed on at least one side of the clamp head by welding or clamping.

[0010] Preferably, each shielding block is fixed on the outer side surface of the clamp head at a predetermined interval by welding or clamping.

[0011] Preferably, the length of the shielding block is greater than the width of the working belt so as to completely cover the corresponding inner surface of the working belt.

[0012] Preferably, the spring is installed on the clamp handle in such a way that the clamp head is in an initial state of the maximum open angle.

[0013] According to another aspect of the utility model, an extrusion die is provided, which is manufactured by performing secondary nitriding after primary nitriding using the above-mentioned tooling for secondary partial nitriding of the working belt of the extrusion die, and stripes with a width consistent with the width of the shielding blocks or the spacing between the shielding blocks are formed on the inner wall surface of the working belt.

[0014] The beneficial effects of the utility model are as follows: the tooling can be used on the working belt of the extrusion die when the extrusion die is subjected to secondary nitriding after the first nitriding, and the working belt is partially shielded. As a result of the secondary nitriding, the thickness of the nitriding layer in the shielded area is less than the thickness of the nitriding layer in the non-shielded area. When the extrusion die is used for extrusion, the nitriding layer with a large thickness is relatively wear-resistant, and the nitriding layer with a small thickness is relatively not wear-resistant, but the difference between the two is very small. However, the extruded aluminum alloy profile will form specific stripes, and the width of a single stripe is consistent with the width of the shielding block or the spacing between the shielding blocks. In this way, the material information can be traced through the appearance of specific stripes.

[0015] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic front view of a tooling for secondary partial nitriding of an extrusion die working belt;

[0017] Figure 2 A schematic top view of the tooling for secondary partial nitriding of the extrusion die working belt;

[0018] Figure 3 This is a top view schematic diagram of the tooling (without the clamp handle) for secondary partial nitriding of the extrusion die when it is in cooperation with the extrusion die. DETAILED DESCRIPTION

[0019] The exemplary embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings. The exemplary embodiments described below and shown in the drawings are intended to teach the principles of the present utility model so that those skilled in the art can implement and use the present utility model in several different environments and for several different applications. Therefore, the protection scope of the present utility model is defined by the appended claims, and the exemplary embodiments are not intended to, and should not be considered as, a restrictive description of the protection scope of the present utility model. Moreover, for the convenience of description, the sizes of the various parts shown in the drawings are not necessarily drawn according to the actual proportional relationship. Regarding the orientation description, such as the orientation or positional relationship indicated by inner, outer, upper, lower, left, right, top, bottom, etc., it is all based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model. Throughout the drawings, the same elements are represented by the same or similar reference numerals. When it may cause confusion in understanding the present disclosure or is not easy to observe and understand, the conventional structure or local structure will be omitted. Unless otherwise specifically stated, the order of the components and assembly steps and the numerical values set forth in the embodiments do not limit the scope of the present utility model.

[0020] As Figures 1 to 3 shown, a tooling 100 for secondary partial nitriding of the working belt of an extrusion die includes: a positioning block 101, a shielding block 102, a clamp head 103, a clamp handle 104, a rotating shaft 105, a hook 106, and a spring 107. The clamp head 103, the clamp handle 104, and the rotating shaft 105 are integrally configured as a clamp body that can be opened and closed around the rotating shaft 105. After the primary nitriding of the extrusion die, the tooling 100 is installed at the working belt 200 of the extrusion die.

[0021] Among them, the positioning block 101 is made of H13 steel, which is the same material as the extrusion die, and can contact the first inner wall 202 in the short direction of the working belt (such as Figure 3 the lower inner wall shown), but no pressure is applied between the positioning block 101 and the first inner wall 202. Therefore, the gap between the two allows the first inner wall 202 to also be effectively nitrided for the second time. The positioning block 101 can be fixed to at least one side of the clamp head 103 by welding or clamping. The clamp head 103 is also made of H13 steel.

[0022] Each shielding block 102 is fixed on the outer side surface of the clamp head 103 at intervals in the shape of blocks with the same thickness and different widths by welding or clamping, etc. The distance between two adjacent ones can be artificially set to a predetermined value. The shielding block 102 is made of pure iron, with the grade DT4E, and the composition conforms to GB6985.

[0023] On the inner side of the pliers handle 104, there are hooks 106 respectively used to hang both ends of the spring 107. Normally, the spring 107 is in a compressed state, generating an outward pushing force on the pliers handle 104, making the pliers head 103 in an initial state with the maximum opening angle. When in use, a clamping force is applied to the spring 107 facing the inner side of the pliers handle 104, and a pre-pressure is generated inside the spring 107, which can bring the two pliers heads 103 together until the two approaching pliers heads 103 can extend into the opening of the working belt 200.

[0024] In some embodiments, the width of the working belt 200 (the dimension in the direction perpendicular to the paper surface) is 10 - 12 mm, and the length of the shielding block 102 (the dimension in the direction perpendicular to the paper surface) is 18 ± 1 mm. To ensure that the working belt 200 can be covered, the shielding block 102 should be longer. Figure 3 In some embodiments, the width of the working belt 200 (the dimension in the direction perpendicular to the paper surface) is 10 - 12 mm, and the length of the shielding block 102 (the dimension in the direction perpendicular to the paper surface) is 18 ± 1 mm. To ensure that the working belt 200 can be covered, the shielding block 102 should be longer. Figure 3 In some embodiments, the width of the working belt 200 (the dimension in the direction perpendicular to the paper surface) is 10 - 12 mm, and the length of the shielding block 102 (the dimension in the direction perpendicular to the paper surface) is 18 ± 1 mm. To ensure that the working belt 200 can be covered, the shielding block 102 should be longer.

[0025] In some embodiments, the elastic force of the spring 107 varies between 0 - 1000 N, and when clamping the working belt 200, the elastic force of the spring 107 is between 600 - 800 N.

[0026] Working method: The required extrusion die is first nitrided once. The nitriding process can be: furnace temperature 520 - 540 °C, holding time 9 - 10 hours, ammonia decomposition rate 35% - 55%, furnace pressure 45 - 65 mmHg. 2 After the first nitriding, take out the extrusion die and cool it to room temperature. Compress the pliers handle 104 and apply a force towards the spring 107. A pressure is generated inside the spring 107, and the two pliers heads 103 can come together. At this time, the maximum pressure of the spring 107 is between 950 - 1000 N. Hold the pliers handle 104 and extend the pliers head 103 of the tooling into the working belt 200. Place the side of the positioning block 101 close to the first inner wall 202 (for example, the lower side in Figure 3 ), and then slowly release the hand. Under the pressure of the spring 107, the shielding block 102 closely adheres to both sides of the second inner wall 201 in the length direction of the working belt of the extrusion die. The length direction of the shielding block 102 is preferably centered in the width direction of the working belt 200 to ensure that the shielding block 102 completely covers the working belt 200.

[0027] Subsequently, the extrusion die undergoes secondary nitriding. The nitriding process can be: furnace temperature 520 - 540 °C, holding time 9 - 10 hours, ammonia decomposition rate 35% - 55%, furnace pressure 45 - 65 mmHg. 2 mmHg.

[0028] Thus, on the inner surface of the working belt 200, the height difference between the primary nitrided layer (corresponding to the inner surface of the working belt 200 completely covered by the shielding block 102) and the secondary nitrided layer (corresponding to the inner surface of the working belt 200 not completely covered by the shielding block 102, for example, corresponding to the inner surface of the working belt 200 in the interval between two shielding blocks 102) is about 20-35 microns, and the surface hardness difference is 10-15 HRC.

[0029] When extrusion is carried out using the extrusion die after the secondary nitriding, specific stripes corresponding to the layout dimensions of the shielding blocks 102 will be formed on both surfaces of the profile. Taking four shielding blocks 102 on each side as an example, different widths of the single shielding block 102 will form stripes with corresponding different widths, and each stripe width can represent an information. The spacing between the shielding blocks 102 can also form stripes with corresponding widths, and each stripe width can represent an information. Thus, a total of 4 + 3 + 4 + 3 = 14 pieces of information can be characterized. Generally, the more important traceability information includes the profile manufacturer (fixed information), the extrusion die manufacturer (fixed information), the die serial number (fixed information), and the production date (changing information). The above can lock the unique information. Once a problem occurs at the client side, the production record information in the factory can be queried according to the information, and other information can be traced back.

[0030] The above-mentioned shielding block 102 is not limited to a rectangular parallelepiped, and can also be of other shapes, so as to provide information not limited to the stripe width.

[0031] The above shows that a plurality of shielding blocks 102 are arranged on the outer sides of both clamping heads 103, but it is not limited to this. A plurality of shielding blocks 102 can also be arranged at intervals on the outer side of only one clamping head 103.

[0032] The above shows the spring 107 in the form of a compression spring, but it is not limited to this. A tension spring can also be installed on one side of the clamping head 103 in a stretched state.

[0033] The above shows the positioning block 101 positioned on the first inner wall 202 of the working belt, but it is not limited to this. As long as the positioning block 101 can be stably positioned on the inner wall of the working belt, for example, in the scenario where the Figure 3 shown structure is flipped 90 degrees, the positioning block 101 can also be set to be positioned on the first inner wall 202 and / or the second inner wall 201 of the working belt.

[0034] The above shows an example where a plurality of shielding blocks 102 are fixed at intervals on the outer side of the clamping head 103 in the shape of blocks with the same thickness and different widths from each other, but it is not limited to this. A scenario where the plurality of shielding blocks 102 are in the shape of blocks with the same width from each other is also applicable to the present invention.

[0035] The spring 107 is shown above as being installed on the pliers handle 104 in a manner that enables the pliers head 103 to be in an initial state of maximum opening angle. However, it is not limited to this. As long as the spring 107 can cause the pliers handle 104 to rebound with an appropriate reaction force and contact the corresponding inner surface of the working belt 200, it is acceptable.

[0036] According to the present utility model, for the extrusion die with a part of it blocked by the tooling 100, after re-performing secondary nitriding, there will be a thickness difference at the micron level and a surface hardness difference of several tens of Rockwell hardness between the surface of the unblocked working belt 200 and the surface of the blocked working belt 200. During extrusion, a very obvious stripe boundary line will be generated on the profile surface corresponding to the unblocked working belt 200 and the blocked working belt 200, which can be used for the decoration of the profile and can further be used to trace process information.

[0037] In the description of the present application, the meaning of "a plurality of" is two or more than two, unless otherwise specifically defined. Unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. Although the present utility model has been described with reference to various specific embodiments, it should be understood that modifications can be made within the spirit and scope of the described inventive concept. Therefore, it is intended that the present utility model is not limited to the described embodiments, but will have the full scope defined by the language of the appended claims.

Claims

1. A tool for secondary partial nitriding of an extrusion die working belt, characterized in that: include: A positioning block (101) for positioning on the inner wall of a working belt, a shielding block (102) for shielding the inner wall of the working belt, a pliers head (103), a pliers handle (104), a rotating shaft (105), and a spring (107), wherein the pliers head (103), the pliers handle (104), and the rotating shaft (105) constitute a pliers body that can be opened and closed around the rotating shaft (105); the positioning block (101) is fixedly arranged on one side of the pliers head (103); a plurality of shielding blocks (102) are fixed to the outer surface of the pliers head (103) at intervals in the shape of blocks with the same thickness; and the spring (107) is mounted on the pliers handle (104) in such a way that the pliers head (103) is in an initial state of an open angle.

2. The tooling for secondary partial nitriding of the working belt of an extrusion die according to claim 1, characterized in that: A plurality of shielding blocks (102) are fixed on the outer side surface of the pliers head (103) at intervals in the shape of blocks having the same thickness but different widths.

3. The tooling for secondary partial nitriding of the working belt of an extrusion die according to claim 1, characterized in that: It also includes a draw hook (106) located on the pliers handle (104) and used to install a spring (107).

4. The tooling for secondary partial nitriding of the working belt of an extrusion die according to claim 1, characterized in that: The positioning block (101) is used to be positioned on the first inner wall (202) of the working belt, that is, the inner wall in the short direction of the working belt.

5. The tooling for secondary partial nitriding of the working belt of an extrusion die according to claim 1, characterized in that: The shielding block (102) is used to shield the second inner wall (201) of the working belt, that is, the inner wall of the working belt of the extrusion die in the long direction.

6. The tooling for secondary partial nitriding of the working belt of an extrusion die according to claim 1, characterized in that: The positioning block (101) is fixed to at least one side of the clamp head (103) by welding or clamping.

7. The tooling for secondary partial nitriding of the working belt of an extrusion die according to claim 1, characterized in that: Each shielding block (102) is fixed on the outer surface of the clamp head (103) at a predetermined interval by welding or clamping.

8. The tooling for secondary partial nitriding of the working belt of an extrusion die according to claim 1, characterized in that: The length of the shielding block (102) is greater than the width of the working belt (200), so as to completely cover the corresponding inner surface of the working belt (200).

9. The tooling for secondary partial nitriding of the working belt of an extrusion die according to claim 1, characterized in that: The spring (107) is mounted on the pliers handle (104) in such a manner that the pliers head (103) is in an initial state of a maximum opening angle.

10. An extrusion die, characterized in that: After the primary nitriding, the secondary nitriding is performed again using the tooling for secondary partial nitriding of the working belt of the extrusion die as described in any one of claims 1 to 9, and stripes with a width consistent with the width of the shielding blocks (102) or the spacing between the shielding blocks (102) are formed on the inner wall surface of the working belt.

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