Die trepanning pretreatment structure and counter bore die

Abstract

The utility model relates to the technical field of trepanning dies, in particular to a die trepanning pretreatment structure and a counter bore die, the counter bore die comprises a die core, and the die core is provided with a forming hole structure; at least part of the forming hole structure is machined and formed by a discharge electrode; the peripheral side of the forming hole structure is provided with a reference hole used for positioning a discharge electrode, and the central axis of the reference hole is parallel to the central axis of the forming hole structure. According to the utility model, through the arrangement of the reference hole, when the discharge electrode is processed, the discharge electrode is positioned through the reference hole, so that the precision of centering is improved, and the error is controlled to be 0.002-0.003 mm. The invention further discloses a mold trepanning pretreatment structure which comprises a mold core, the mold core is provided with a pretreatment hole structure, and the pretreatment hole structure is configured to be a rough trepanning hole for allowance removal before discharge electrode machining; and the subsequent discharge electrode machining efficiency is improved, and the efficiency can be improved by 5-6 times generally.

Description

Technical Field

[0001] This utility model relates to the field of hole-opening mold technology, and in particular to a mold hole-opening pretreatment structure and a countersunk hole mold. Background Technology

[0002] In the field of mold manufacturing, countersunk hole molds using electrical discharge machining (EDM) to process through holes is a common process. However, in actual processing, the positioning accuracy of the EDM directly affects the positional accuracy, dimensional accuracy, and overall quality of the hole. In existing technologies, centering countersunk hole molds using external dimensions is unstable, with errors typically ranging from 0.02 to 0.03 mm, which cannot meet actual production requirements. Furthermore, existing circular countersunk hole molds that directly employ EDM are inefficient. Therefore, this invention develops a mold hole pretreatment structure and a countersunk hole mold to address the problems existing in the prior art. Utility Model Content

[0003] The purpose of this utility model is to provide a pre-treatment structure for die opening and a countersunk die to solve the problem of low center positioning accuracy when opening a die in the prior art, and further solve the problem of low processing efficiency based on the design of the pre-treatment structure.

[0004] The technical solution of this utility model is: a countersunk hole mold, including a mold core, wherein a forming hole structure is formed on the mold core; at least part of the forming hole structure is formed by a discharge electrode.

[0005] The outer periphery of the formed hole structure has a reference hole for positioning the discharge electrode, and the central axis of the reference hole is parallel to the central axis of the formed hole structure.

[0006] Preferably, it also includes a mold sleeve disposed on the outside of the mold core, wherein the reference hole is disposed on the mold core or the mold sleeve.

[0007] Preferably, the reference hole penetrates the mold core or mold sleeve.

[0008] Preferably, the formed hole structure includes a first hole body, and a second hole body and a third hole body formed by the discharge electrode;

[0009] The first hole is configured as an ejector pin hole; the second hole is configured as a cavity for product molding; and the third hole is configured as a demolding chamber for product demolding.

[0010] The third hole, the second hole, and the first hole are distributed sequentially in the direction of the processing depth of the discharge electrode.

[0011] Preferably, the first hole, the second hole, and the third hole have a first depth, a second depth, and a third depth, respectively; the sum of the second depth and the third depth is the discharge depth of the discharge electrode.

[0012] Preferably, the inner diameter of the first hole is smaller than the inner diameter of the second and third holes in any depth direction.

[0013] Preferably, the outer contour of the second hole is the same as the outer contour of the discharge electrode; the outer contour of the third hole has a draft angle.

[0014] This application also discloses a mold opening pretreatment structure, including a mold core, on which a pretreatment hole structure is provided and configured to perform rough opening for excess material removal before the discharge electrode is processed.

[0015] The outer periphery of the pre-treatment hole structure has a reference hole for positioning the discharge electrode, and the central axis of the reference hole is parallel to the central axis of the pre-treatment hole structure.

[0016] Preferably, the inner diameter of the pre-treated hole structure at any depth is smaller than the outer diameter of the discharge electrode at the corresponding depth during final forming.

[0017] Compared with the prior art, the advantages of this utility model are:

[0018] (1) By setting a reference hole, the discharge electrode is positioned by the reference hole during processing, thereby improving the accuracy of centering and finding the center, and controlling the error between 0.002-0.003mm.

[0019] (2) A mold opening pretreatment structure is adopted. The pretreatment structure is equipped with a pretreatment hole structure, which serves as a rough hole for removing excess material before the discharge electrode is processed, thereby improving the efficiency of subsequent discharge electrode processing. The efficiency can generally be improved by 5-6 times. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Figure 1 This is a flowchart illustrating the forming process of countersunk hole molds in existing technologies.

[0022] Figure 2 This is a cross-sectional view of a countersunk hole mold according to the present invention;

[0023] Figure 3 This is a front view of a countersunk hole mold according to the present invention;

[0024] Figure 4 This is a flowchart illustrating the forming process of a countersunk hole mold according to the present invention.

[0025] Among them: 001, countersunk hole mold; 002, mold opening pretreatment structure;

[0026] 1. Mold core;

[0027] 2. Mold;

[0028] 3. Formed hole structure, 31. First hole body, 32. Second hole body, 33. Third hole body;

[0029] 4. Reference hole;

[0030] 5. Pre-treated hole structure. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to specific embodiments:

[0032] To facilitate understanding, the application scenario of this application will be explained first, combined with... Figure 1 As shown, the processing of countersunk hole molds in the prior art generally employs a combination of two methods: slow wire cutting and discharge electrode drilling. In step a, slow wire cutting is used to process a small-diameter through hole, and then in step b, discharge electrode drilling is used to form the cavity and demolding chamber. In the prior art, during discharge electrode drilling, positioning is based on the small-diameter through hole formed by slow wire cutting. However, as the discharge electrode continuously drills holes, the depth of the small-diameter through hole formed by slow wire cutting gradually decreases, resulting in poor positioning accuracy. Furthermore, direct discharge machining via slow wire cutting is extremely inefficient. Therefore, this application discloses a mold drilling pretreatment structure and a countersunk hole mold.

[0033] Specifically, such as Figure 2 , Figure 3 As shown, a countersunk hole mold 001 includes a mold core 1 and a mold sleeve 2 disposed outside the mold core 1. The mold core 1 and the mold sleeve 2 are coaxially arranged. In actual processing, the mold core 1 is made of tungsten steel, and the mold sleeve 2 is made of 45 steel. The mold core 1 has a forming hole structure 3, at least part of which is formed by a discharge electrode. The outer periphery of the forming hole structure 3 has a reference hole 4 for positioning the discharge electrode, and the central axis of the reference hole 4 is parallel to the central axis of the forming hole structure 3.

[0034] In one embodiment, the reference hole 4 is disposed on the mold core 1 and penetrates through the mold core 1. In other embodiments, the reference hole 4 is also disposed on the mold sleeve 2 and penetrates through the mold sleeve 2. The reference hole 4 is used to position the discharge electrode during the processing of the discharge electrode, improving the accuracy of centering the discharge electrode, with the error controlled within 0.002-0.003 mm.

[0035] The formed hole structure 3 includes a first hole body 31, and a second hole body 32 and a third hole body 33 formed by a discharge electrode; the first hole body 31, the second hole body 32 and the third hole body 33 have a first depth, a second depth and a third depth respectively, and are coaxially arranged. The inner diameter of the first hole body 31 is smaller than the inner diameter of the second hole body 32 and the third hole body 33 in any depth direction.

[0036] The first hole 31 is configured as an ejector pin hole for ejecting the product after it is formed; the second hole 32 is configured as a cavity for forming the product, and its outline shape is the same as the outline shape of the final formed product and the discharge electrode; the third hole 33 is configured as a demolding chamber for demolding the product, and the outer outline of the third hole 33 has a demolding draft angle controlled at 0.05mm; the third hole 33, the second hole 32 and the first hole 31 are distributed sequentially in the direction of the processing depth of the discharge electrode.

[0037] During the forming process, the first hole 31 is formed by slow wire cutting, and the second hole 32 and the third hole 33 are formed by discharge electrode processing. The sum of the second depth and the third depth is the discharge depth of the discharge electrode.

[0038] After the first hole 31 is formed, if the discharge electrode is used directly to process the second hole 32 and the third hole 33, a high-energy pulse is required, which leads to a surge in the wear rate of the discharge electrode and extremely low working efficiency. At the same time, since the discharge electrode needs to pass through a certain material thickness, the wear accumulates significantly, and the discharge electrode needs to be frequently corrected or replaced. Therefore, this application also discloses a mold opening pretreatment structure 002.

[0039] Specifically, refer to Figure 4 As shown, the mold opening pretreatment structure 002 includes a mold core 1, on which a pretreatment hole structure 5 is provided, configured as a rough hole for removing excess material before the discharge electrode is processed. The outer periphery of the pretreatment hole structure 5 has a reference hole 4 for positioning the discharge electrode, and the central axis of the reference hole 4 is parallel to the central axis of the pretreatment hole structure 5.

[0040] The pre-processed hole structure 5 uses a grinding head (e.g., a ball mill) to quickly remove more than 90% of the machining allowance through physical cutting, ensuring that the inner diameter of the pre-processed hole structure 5 at any depth is smaller than the outer diameter of the discharge electrode at the corresponding depth during final forming. In other words, the inner diameter of the pre-processed hole structure 5 at any depth is smaller than the inner diameters of the second hole 32 and the third hole 33 in the formed hole structure 3 at the same depth. Therefore, the subsequent discharge electrode only needs to process the allowance removed by the grinding head, significantly reducing the number of discharge pulses required.

[0041] The material removal rate of the grinding head's cutting process per unit time is far greater than that of the discharge electrode, thus effectively improving processing efficiency and reducing the burden on subsequent discharge processing. The discharge electrode is then used to correct dimensional accuracy and surface roughness, ensuring processing precision. Based on the coordination between the grinding head's cutting process and the discharge electrode processing, work efficiency is increased by 5-6 times.

[0042] like Figure 4 As shown, based on the mold opening pretreatment structure 002, the forming method of the countersunk mold 001 in this application is as follows:

[0043] S1. The first hole 31 and the reference hole 4 are opened by slow wire cutting. At this time, the depth of the first hole 31 extends through the entire mold core 1.

[0044] S2. The roughing process is carried out on a drilling machine using a grinding head to remove excess material and form a pre-treated hole structure. The inner diameter of the pre-treated hole structure 5 in any depth direction is smaller than the inner diameter of the second hole body 32 and the third hole body 33 in the same depth direction.

[0045] S3. Based on the pre-treated hole structure 5, the dimensional accuracy and surface roughness are corrected by using a discharge electrode to form the second hole 32 and the third hole 33.

[0046] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore, all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within this utility model.

Claims

1. A countersunk hole mold, characterized in that, Includes a mold core (1), on which a forming hole structure (3) is provided; at least a portion of the forming hole structure (3) is formed by a discharge electrode; The outer periphery of the formed hole structure (3) has a reference hole (4) for positioning the discharge electrode, and the central axis of the reference hole (4) is parallel to the central axis of the formed hole structure (3).

2. The countersunk die according to claim 1, characterized in that: It also includes a mold sleeve (2) disposed on the outside of the mold core (1), and the reference hole (4) is disposed on the mold core (1) or the mold sleeve (2).

3. The countersinking mold according to claim 2, characterized in that: The reference hole (4) penetrates the mold core (1) or the mold sleeve (2).

4. The countersunk die according to claim 1, characterized in that: The formed hole structure (3) includes a first hole body (31), and a second hole body (32) and a third hole body (33) formed by the discharge electrode; The first hole (31) is configured as an ejector pin hole; the second hole (32) is configured as a cavity for product molding; and the third hole (33) is configured as a demolding chamber for product demolding. In the direction of the processing depth of the discharge electrode, the third hole (33), the second hole (32) and the first hole (31) are distributed in sequence.

5. A countersunk hole mold according to claim 4, characterized in that: The first hole (31), the second hole (32) and the third hole (33) have a first depth, a second depth and a third depth, respectively; the sum of the second depth and the third depth is the discharge depth of the discharge electrode.

6. A countersunk die according to claim 4, characterized in that: The inner diameter of the first hole (31) is smaller than the inner diameter of the second hole (32) and the third hole (33) in any depth direction.

7. A countersunk die according to claim 4, characterized in that: The outer contour of the second hole (32) is the same as the outer contour of the discharge electrode; the outer contour of the third hole (33) has a draft angle.

8. A pre-treatment structure for mold opening, characterized in that, Includes a mold core (1), on which a pre-processing hole structure (5) is provided and configured to be a coarse hole for removing excess material before the discharge electrode is processed; The pre-treatment hole structure (5) has a reference hole (4) on its outer periphery for positioning the discharge electrode, and the central axis of the reference hole (4) is parallel to the central axis of the pre-treatment hole structure (5).

9. The mold opening pretreatment structure according to claim 8, characterized in that: The inner diameter of the pre-treated hole structure (5) at any depth is smaller than the outer diameter of the discharge electrode at the corresponding depth during final forming.

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