Core rod seat for extruding hard alloy double-spiral-hole round rod

Abstract

The utility model relates to the technical field of powder metallurgy jigs, in particular to a core rod seat for extruding a hard alloy double-spiral-hole round rod, which comprises a core rod seat body, and two through holes which are arranged side by side and used for extruding a core rod wire are arranged on the core rod seat body along the radial direction of the core rod seat body. The through holes penetrate through the core rod seat body along the axial direction of the core rod seat body; the lengths of the two through holes are the same; the two through holes are symmetrically formed in the two sides of the axis of the core rod base body respectively. The parts, close to the top of the core rod base body, of the opposite side surfaces of the two through holes are arranged in an R-angle chamfering mode. Before the R angle is chamfered, the opposite side surfaces of the two through holes are perpendicular to the top surface of the core rod seat body, and the parts, close to the top of the core rod seat body, of the opposite side surfaces of the two through holes are chamfered, so that the friction force borne by the part of the core rod wire is reduced or the time period when the part of the core rod wire passes through an original perpendicular area is shortened; and the risk of breakage of the core rod wire is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to powder metallurgy jig technical field, concretely relates to hard alloy double helical hole round bar extrusion core rod seat. BACKGROUND

[0002] Double helical hole type internal cooling drilling tool as important tool in mechanical processing field, is widely used in aerospace, automobile, mould, energy, electron, machine tool and a plurality of key industries. In the field of aerospace, it plays a key role to the machining of high-precision parts, helps to ensure the stability and safety of aircraft structure, in the field of automobile manufacturing, helps to improve the machining precision and efficiency of engine, transmission and other core components, and further improves the overall performance of automobile.

[0003] Compared with the traditional drilling tool without internal cooling hole, double helical hole type internal cooling drilling tool shows significant advantages. Its unique internal cooling design greatly improves the cooling effect, can quickly take away heat in the machining process, effectively reduces the temperature of the tool and workpiece, reduces thermal deformation and tool wear. This excellent cooling performance directly brings the leap of machining efficiency, the machining efficiency is improved by 2-4 times compared with the traditional tool, greatly shortens the production cycle, reduces the production cost, and improves the market competitiveness of enterprises.

[0004] The raw material of double helical hole type internal cooling drilling tool is hard alloy internal spiral hole bar stock, and a core rod seat and a core rod wire are used to produce the spiral hole bar stock during preparation. However, the existing core rod seat has obvious defects when used with the core rod wire. When the pressure is too large during preparation, the core rod wire and the core rod seat will produce violent friction, which can easily cause the core rod wire to be cut off by the core rod seat, which not only causes damage to the core rod wire and increases production cost, but also affects the production quality and production efficiency of the hard alloy internal spiral hole bar stock, and restricts the high-quality and high-efficiency preparation of the raw material of the double helical hole type internal cooling drilling tool.

[0005] Therefore, how to solve the above-mentioned problems in the prior art, that is, the core rod wire is easily cut off by the core rod seat due to excessive pressure during preparation, has become the research and solution of the utility model. UTILITY MODEL CONTENT

[0006] The utility model aims at providing a hard alloy double helical hole round bar extrusion core rod seat.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme of:

[0008] The utility model provides a hard alloy double helix hole round bar extrusion core rod seat, including core rod seat body, along the radial of core rod seat body, two side by side and be used for extruding core rod line's through -hole is provided on core rod seat body, the through -hole all is along the axial direction of core rod seat body and is arranged through core rod seat body, and the through -hole is used for the core rod line to wear and set up,

[0009] The length of the two through holes is the same.

[0010] The two through holes are respectively symmetrically arranged on the two sides of the axis of the core rod seat body.

[0011] The opposite side surface of the two through holes is R-angled near the top of the core rod seat body.

[0012] In the above scheme, the core rod seat body is used with the core rod line. When used, the two ends of a core rod line are respectively threaded through the two through holes from one side of the top of the core rod seat. Then, the length of the core rod line extending out of the through hole is adjusted so that the two end surfaces of the core rod line are flush or close to flush. Then, the two ends of the core rod line are pulled at the same time so that the part of the core rod line between the two through holes is attached to the top surface of the core rod seat body.

[0013] The length of the two through holes is the same, and the two through holes are respectively symmetrically arranged on the two sides of the axis of the core rod seat body, which provides convenience for using the core rod line and improves the processing quality and precision of the soft blank.

[0014] Before the R-angle is not set, the included angle between the parts of the core rod line is ninety degrees. The reason for this is that the opposite side surface of the two through holes is perpendicular to the top surface of the core rod seat body, which causes the part of the core rod line to receive a larger friction force when passing through the vertical area.

[0015] The opposite side surface of the two through holes is R-angled near the top of the core rod seat body, which eliminates the above-mentioned vertical area or reduces the range of the above-mentioned vertical area. The friction force received by the part of the core rod line when passing through the original vertical area is reduced or the time period of receiving a larger friction force is shortened. The risk of the core rod line breaking due to increased pressure or long-term extrusion work is reduced, and the service life of the core rod line is prolonged.

[0016] In a further technical solution, the top surface of the core rod seat body is recessed downward to form a groove, and the groove communicates with the two through holes and is used to accommodate the part of the core rod line between the two through holes.

[0017] When the groove is not set, the part of the core rod line between the two through holes is attached to the top surface of the core rod seat body (this part is exposed outside the core rod seat) when working. In the extrusion process, the extrusion pressure acts on this part of the core rod line exposed outside the core rod seat through the hard alloy mixture.

[0018] After the groove is set, the part of the core rod wire between the two through holes is attached to the bottom wall of the groove during work (this part is not exposed outside the core rod seat), and during extrusion, the extrusion pressure mainly acts on the core rod seat body, which can effectively reduce the extrusion pressure acting on the core rod wire and reduce the risk of core rod wire breakage. When replacing the core rod wire, only the core rod wire needs to be ejected and a new core rod wire is installed.

[0019] Further technical solutions, the side surface opposite to the two through holes is smoothly connected with the bottom wall of the groove.

[0020] The side surface opposite to the two through holes is smoothly connected with the bottom wall of the groove, so that there is no protruding surface between the side surface opposite to the two through holes and the bottom wall of the groove, avoiding the friction of part of the core rod wire during work due to the protruding surface, and further prolonging the service life of the core rod wire.

[0021] It should be emphasized that when the groove is set, the bottom wall of the groove can be regarded as part of the top surface of the core rod seat body.

[0022] Further technical solutions, the bottom wall of the groove is parallel to the top surface of the core rod seat body.

[0023] The bottom wall of the groove is parallel to the top surface of the core rod seat body, which can reduce the processing difficulty of the groove and improve the overall appearance of the core rod seat body. On the other hand, it can facilitate the same radius size requirement of the R angle on the side surface opposite to the two through holes; on the other hand, it is convenient to assemble the core rod wire. Before use, in some cases, the two ends of the core rod wire need to be adjusted to be flush, and the present embodiment provides convenience for such adjustment.

[0024] Further technical solutions, the radius size of the R angle on the side surface opposite to the two through holes is the same.

[0025] When the radius size of the R angle on the side surface opposite to the two through holes is the same, it helps to maintain the symmetry of the through hole, so that the whole structure of the core rod seat body is more uniform under stress, avoiding additional torque due to asymmetric structure, thereby improving the stability and reliability of the structure.

[0026] From the appearance, the same R angle radius can make the core rod seat body present a more neat and beautiful effect, and improve the overall quality image of the product.

[0027] For the machining process, setting the same R corner radius can simplify the machining process and mold design. In the machining process, only one set of tool or mold parameters is needed to complete the machining of the R corner on both sides, reducing the replacement frequency and adjustment times of the tool or mold, improving the machining efficiency and reducing the production cost. At the same time, it is also convenient for quality control during the machining process. At this time, only one size standard needs to be monitored, reducing the scrap rate due to size differences.

[0028] In terms of product maintenance and component replacement, when the R corner size is the same, when the parts need to be replaced, it is more convenient to find matching parts, and during maintenance, the repaired product can be ensured to be consistent with the original product in structure and performance, reducing the difficulty and cost of maintenance.

[0029] Further technical solutions, the core rod seat body is set to a stainless steel core rod seat body or a die steel core rod seat body.

[0030] The stainless steel core rod seat body will not rust as easily as ordinary carbon steel, thereby ensuring the service life of the core rod seat body.

[0031] The stainless steel core rod seat body can improve the overall appearance quality, and does not need additional surface treatment to maintain the appearance after a long period of use.

[0032] The stainless steel core rod seat body has certain strength and toughness, and can withstand certain axial and radial loads.

[0033] The die steel core rod seat body has high hardness, which can reduce the size change and surface damage caused by friction, thereby ensuring the service life of the core rod seat body.

[0034] Further technical solutions, the through hole is set to a cylindrical through hole.

[0035] The cylindrical through hole is relatively simple to process, reducing the processing difficulty of the core rod seat body.

[0036] The machining precision of the cylindrical through hole is easier to control, and it is easy to meet the predetermined machining requirements of the core rod seat body.

[0037] When the cylindrical through hole bears axial or radial force, the stress distribution is relatively uniform, and such uniform stress distribution helps to improve the overall strength and reliability of the core rod seat body.

[0038] As for "first", "second", etc. used in this paper, it does not mean to specially indicate the order or sequence, nor to limit the case. It is only for the purpose of distinguishing the components or operations described by the same technical terms.

[0039] As used herein, the terms "connected," "coupled," or "positioned" are used broadly and encompass both direct and indirect connections, couplings, or positioning, as well as any two or more components or devices that are coupled or positioned, either directly or indirectly, to each other.

[0040] As used herein, the terms "comprises," "comprising," "includes," "including," "has," "having" or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0041] As used herein, the terms "comprises," "comprising," "includes," "including," "has," "having" or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0042] As used herein, the terms "comprises," "comprising," "includes," "including," "has," "having" or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0043] The working principle and advantages of the utility model are as follows: the core rod seat body is used with the core rod wire, when using, the two ends of a core rod wire are respectively threaded through two through holes from the top side of the core rod seat, then the length of the core rod wire extending out of the through hole is adjusted, so that the two end surfaces of the core rod wire are flush or close to flush, then the two ends of the core rod wire are pulled at the same time, so that the part of the core rod wire between the two through holes is attached to the top surface of the core rod seat body. Before the R angle is inverted, the included angle between the part of the core rod wire is ninety degrees, the reason for this situation is that the side surface opposite to the two through holes is perpendicular to the top surface of the core rod seat body, which causes the core rod wire to receive greater friction when passing through the vertical area. The part close to the top of the core rod seat body on the side surface opposite to the two through holes is provided with an inverted R angle, which eliminates the above-mentioned vertical area or reduces the range of the above-mentioned vertical area, the friction received by the part of the core rod wire when passing through the original vertical area is reduced or the time period of receiving greater friction is shortened, the risk of the core rod wire breaking due to the increase of pressure or long-time extrusion is reduced, and the service life of the core rod wire is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 It is a sectional view of the core rod seat for hard alloy double spiral hole round bar extrusion of the utility model embodiment;

[0045] Figure 2 It is a top view of the core rod seat for hard alloy double spiral hole round bar extrusion of the utility model embodiment;

[0046] Figure 3 It is a schematic view of the cooperation of the core rod seat and the core rod wire of the utility model embodiment;

[0047] Figure 4 The soft blank pitch change schematic view of the core rod seat and the traditional core rod seat after different time of use.

[0048] In the above drawing: 1, core rod seat body; 2, through hole; 3, inverted R corner area; 4, groove; 5, core rod wire. DETAILED DESCRIPTION

[0049] The utility model will be further described below in combination with the drawings and examples:

[0050] Example: the following will be described in detail by drawing to clearly explain the case, any person skilled in the art after understanding the example of the case, can be changed and modified by the technology taught by the case, which does not deviate from the spirit and scope of the case.

[0051] The language in this paper is only for describing specific embodiments, and is not intended to limit the case. The singular form such as "a", "this", "this", "this" and "the" is also used in this paper, which also includes the plural form.

[0052] Referring to Figures 1-4 , the hard alloy double helical hole round rod extrusion core rod seat comprises a core rod seat body 1, two through holes 2 for extruding core rod wires 5 are arranged side by side on the core rod seat body 1 along the radial direction of the core rod seat body 1, and the through holes 2 are all arranged through the core rod seat body 1 along the axial direction of the core rod seat body 1;

[0053] The lengths of the two through holes 2 are the same;

[0054] The two through holes 2 are respectively arranged symmetrically on both sides of the axis of the core rod seat body 1;

[0055] The opposite side surfaces of the two through holes 2 are all arranged with inverted R corners (arranged as inverted R corner areas 3) close to the top of the core rod seat body 1.

[0056] The through hole 2 is provided for the core rod wire.

[0057] The core rod seat body 1 is used with the core rod wire 5, when used, the two ends of a core rod wire 5 are respectively threaded through the two through holes 2 from one side of the top of the core rod seat; then the length of the core rod wire 5 extending out of the through hole 2 is adjusted, so that the two end surfaces of the core rod wire 5 are flush or close to flush; then the two ends of the core rod wire 5 are pulled at the same time, so that the part of the core rod wire 5 between the two through holes 2 is attached to the top surface of the core rod seat body 1 (at this time, the core rod wire 5 can be regarded as a door shape, and the core rod wire 5 can be made of nylon material).

[0058] The lengths of the two through holes 2 are the same and the two through holes 2 are respectively arranged symmetrically on both sides of the axis of the core rod seat body 1, which provides convenience for using the core rod wire 5 and improves the processing quality and processing precision of the soft blank.

[0059] Before the chamfered R-angle, the included angle between some parts of the core rod 5 is 90 degrees. The reason for this is that the opposite side surface of the two through holes 2 is set perpendicular to the top surface of the core rod seat 1, which causes the core rod 5 to experience greater friction when passing through this vertical area.

[0060] The portions of the two through holes 2 near the top of the core rod seat 1 on opposite sides are all chamfered, eliminating or reducing the range of the vertical area. The friction force on the core rod 5 when passing through the original vertical area is reduced or the time period of large friction force is shortened, reducing the risk of core rod 5 breaking due to increased pressure or long-term extrusion, and extending the service life of core rod 5.

[0061] Optionally, the opposite surfaces of the two through holes 2 are smoothly connected to the top surface of the core rod seat 1, thus completely eliminating the aforementioned vertical area.

[0062] Optionally, the spacing between the two through holes 2 can range from 1 to 16 mm. The spacing between the through holes 2 can be adjusted according to the usage requirements.

[0063] Optionally, the inner diameter of the through hole 2 can range from 0.5 to 4 mm. The inner diameter of the through hole 2 can be adjusted according to the application requirements.

[0064] Optionally, the radius of the chamfer can range from 0.3 to 0.8 mm.

[0065] See Figure 1 , Figure 2 In this embodiment, the top surface of the core rod seat 1 is recessed downward to form a groove 4. The groove 4 connects the two through holes 2 and is used to accommodate the portion of the core rod wire 5 located between the two through holes 2.

[0066] When the groove 4 is not provided, the part of the core rod 5 located between the two through holes 2 is attached to the top surface of the core rod seat 1 during operation (this part is exposed on the outside of the core rod seat). During the extrusion process, the extrusion pressure is applied to this part of the core rod 5 exposed on the outside of the core rod seat through the hard alloy mixture.

[0067] After the groove 4 is set, the part of the core rod 5 between the two through holes 2 fits against the bottom wall of the groove 4 during operation (this part is not exposed on the outside of the core rod seat). During the extrusion process, the extrusion pressure mainly acts on the core rod seat 1, which can effectively reduce the extrusion pressure acting on the core rod 5 and reduce the risk of core rod 5 breaking. When replacing the core rod 5, it is only necessary to push out the core rod 5 and install a new core rod 5.

[0068] Optionally, a blocking block (not shown in the figure) is arranged at the opening of the groove 4, and the blocking block at least blocks the opening of the groove 4, and in some cases, the openings of the two through holes 2 near the opening of the groove 4 can also be blocked. At this time, the groove 4 can be considered to be changed from a groove structure to a hole structure, or a receiving hole can be considered to be formed at the top end region of the core rod seat body 1.

[0069] Optionally, the groove 4 is a circular groove 4 with a diameter ranging from 0.5 mm to 4 mm.

[0070] In some specific designs of the core rod seat, the distance between the two through holes 2 is 9.8 mm, the inner diameter of the through hole 2 is 4 mm, the diameter of the groove 4 is 4 mm, and the radius of the R angle at the groove 4 is 0.5 mm. The core rod seat is designed using this design size, and is matched with a core rod wire 5 with an inner diameter of 0.9 mm to perform double-spiral rod material extrusion. The continuous extrusion work is compared with the traditional core rod seat (for comparison results, see Figure 4 ). During extrusion, before the core rod wire 5 is broken due to friction with the core rod seat body 1, the core rod wire 5 will first deform. At this time, the extrusion spiral will change, generally showing a decrease in pitch. Therefore, by observing the pitch of the round bar soft blank extruded, the state of the core rod wire 5 can be determined.

[0071] See Figure 4 From the table, it can be seen that the core rod seat used in the present application does not break after 3 h, 6 h, and 9 h of continuous extrusion, while the core rod wire 5 of the traditional core rod seat breaks after 9 h of continuous extrusion. The pitch standard of the soft blank is 41.78-43.10 mm. At 6 h, the pitch does not meet the standard in the case of using the traditional core rod seat, indicating that during continuous extrusion, the core rod wire 5 continuously rubs against the core rod seat body 1 (or the core rod seat), first deforms, and then breaks. In the present application, due to the arrangement of the groove 4 and the R angle, the friction experienced by the core rod wire 5 in the early stage is reduced, and the core rod wire 5 can still maintain a normal state after 9 h of continuous use.

[0072] See Figure 1 In this embodiment, the opposite side surfaces of the two through holes 2 are both smoothly connected to the bottom wall of the groove 4.

[0073] In this embodiment, the combination of the opposite side surfaces of the two through holes 2 and the bottom wall of the groove 4 can be approximately regarded as a U-shaped structure.

[0074] The opposite side surfaces of the two through holes 2 are both smoothly connected to the bottom wall of the groove 4, so that there is no protruding surface between the opposite side surfaces of the two through holes 2 and the bottom wall of the groove 4. This avoids the protruding surface causing the friction force experienced by part of the core rod wire 5 during the working process to be too large, further prolonging the service life of the core rod wire 5.

[0075] It is emphasized that when the groove 4 is set, the bottom wall of the groove 4 can be regarded as part of the top surface of the core rod seat body 1.

[0076] Referring to Figure 1 In the embodiment, the bottom wall of the groove 4 is parallel to the top surface of the core rod seat body 1.

[0077] The bottom wall of the groove 4 is parallel to the top surface of the core rod seat body 1, which can reduce the processing difficulty of the groove 4, improve the overall aesthetics of the core rod seat body 1, facilitate the same radius of the R angle on the opposite side surface of the two through holes 2, and facilitate the assembly of the core rod wire 5.

[0078] Referring to Figure 1 In the embodiment, the radius of the R angle on the opposite side surface of the two through holes 2 is the same.

[0079] When the radius of the R angle on the opposite side surface of the two through holes 2 is the same, it helps to maintain the symmetry of the through holes 2, can make the whole structure of the core rod seat body 1 more uniform under stress, avoid additional torque or torque due to asymmetric structure, thereby improving the stability and reliability of the structure.

[0080] From the appearance, the same R angle radius can make the core rod seat body 1 present a more neat and beautiful effect, and improve the overall quality image of the product.

[0081] For the processing process, setting the same R angle radius can simplify the processing technology and mold design. In the processing process, only one set of tool or mold parameters can complete the processing of the R angle on both sides, reducing the replacement frequency and adjustment times of the tool or mold, improving the processing efficiency and reducing the production cost. At the same time, it is also convenient for quality control during processing. At this time, only one size standard needs to be monitored, reducing the scrap rate due to size difference.

[0082] In terms of product maintenance and component replacement, when the R angle size is the same, it is more convenient to find matching parts when replacing parts, and the repaired product can maintain the same structure and performance as the original product during maintenance, reducing the difficulty and cost of maintenance.

[0083] In the embodiment, the core rod seat body 1 is set to be a stainless steel core rod seat body 1 or a die steel core rod seat body 1.

[0084] The stainless steel core rod seat body 1 will not rust as easily as ordinary carbon steel, thereby ensuring the service life of the core rod seat body 1.

[0085] The stainless steel core rod seat body 1 can improve the overall appearance quality, and no additional surface treatment is needed to maintain the appearance after long-term use.

[0086] The stainless steel core rod seat body 1 has certain strength and toughness, and can withstand certain axial and radial loads.

[0087] The die steel core rod seat body 1 has high hardness, which can reduce the size change and surface damage caused by friction, thereby ensuring the service life of the core rod seat body 1.

[0088] Optionally, the material of the core rod seat body 1 is 316L stainless steel or H13 die steel.

[0089] Referring to Figure 2 In the embodiment, the through hole 2 is provided as a cylindrical through hole 2.

[0090] The cylindrical through hole 2 is relatively simple to process, which reduces the processing difficulty of the core rod seat body 1.

[0091] The machining precision of the cylindrical through hole 2 is easier to control, and it is easy to meet the predetermined machining requirements of the core rod seat body 1.

[0092] When the cylindrical through hole 2 bears axial or radial force, the stress distribution is relatively uniform, and such uniform stress distribution helps to improve the overall strength and reliability of the core rod seat body 1.

[0093] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made in accordance with the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A core pin holder for double helical hole round bar extrusion of cemented carbide, characterized in that: The application relates to a core rod seat body (1), wherein two through holes (2) for penetrating and extruding a core rod wire (5) are arranged on the core rod seat body (1) along the radial direction of the core rod seat body (1). The through holes (2) are arranged through the core rod seat body (1) along the axial direction of the core rod seat body (1). The lengths of the two through holes (2) are the same. The two through holes (2) are symmetrically arranged on the two sides of the axis of the core rod seat body (1) respectively. The opposite side surfaces of the two through holes (2) are both arranged with R angles close to the top of the core rod seat body (1).

2. A carbide double helical hole round bar extrusion core rod seat according to claim 1, characterized in that: The top surface of the core rod seat body (1) is concave downward to form a groove (4), the groove (4) is communicated with the two through holes (2) and is used for penetrating and accommodating the part of the core rod wire (5) between the two through holes (2).

3. A carbide double helix hole round bar extrusion core rod seat according to claim 2, characterized in that: The opposite side surfaces of the two through holes (2) are both smoothly connected with the bottom wall of the groove (4).

4. A carbide double helix hole round bar extrusion core rod seat according to claim 3, characterized in that: The bottom wall of the groove (4) is parallel to the top surface of the core rod seat body (1).

5. A carbide double helical hole round bar extrusion core rod seat according to any one of claims 1-4, characterized in that: The radius sizes of the R angles on the opposite side surfaces of the two through holes (2) are the same.

6. A carbide double helical hole round bar extrusion core rod seat according to any one of claims 1-4, characterized in that: The core rod seat body (1) is arranged as a stainless steel core rod seat body or a die steel core rod seat body.

7. A carbide double helical hole round bar extrusion core rod seat according to any one of claims 1 - 4, characterized in that: The through holes (2) are all arranged as cylindrical structures.

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