Tilt-top electrical discharge machining jig

Abstract

The utility model provides a kind of inclined roof electro discharge machining's jig, for assisting inclined roof and rear mould kernel tight fit, inclined roof includes inclined roof pole and pull rod, and one end of pull rod is connected with the joint of inclined roof pole, and the other end of pull rod is provided with anti-drop part, and anti-drop part has a bonding surface, including support mechanism and tight fit mechanism, support mechanism includes bottom plate and support column, and support column is fixed on the upper surface of bottom plate and is used to support and fix rear mould kernel, and the upper surface of bottom plate is provided with pre-positioning structure for positioning pull rod;Tight fit mechanism includes pressing plate and height-adjusting bolt, and pressing plate is detachably arranged above bottom plate and can be controlled to approach or away from bottom plate by height-adjusting bolt, and first through-hole, which can be passed through by pull rod, is formed through pressing plate, and pressing plate is used to compress pull rod, and the lower surface of pressing plate is concavely provided with positioning groove for positioning pull rod and is communicated with first through-hole, and positioning groove has positioning surface matched with bonding surface.

Description

Technical Field

[0001] This utility model relates to the field of mold processing technology, and in particular to a fixture for inclined top electrical discharge machining. Background Technology

[0002] Currently, EDM (Electrical Discharge Machining) of angled ejectors is a key process in mold manufacturing used to process angled ejectors (also known as angled pins), mainly to solve the forming problem of undercut structures in products. In existing technologies, before EDM of the mold core, the angled ejector is generally fixed by a tapping and gluing process. This process involves tapping the contact surface between the angled ejector and the mold core to form indentations, and then applying glue to bond and fix it.

[0003] However, the above-mentioned tapping adhesive process has the following disadvantages:

[0004] (1) Unreliable fixation: The high-frequency vibration generated during electrical discharge machining can easily cause the glue layer to crack or the tapping points to loosen, resulting in micro-displacement between the ejector pin and the mold core. This causes the relative position of the discharge electrode and the workpiece to shift, leading to problems such as overcutting of the glue surface and dimensional deviation. Consequently, this results in problems such as excess glue, gaps in the snap-fit ​​section, burrs, and assembly issues with other parts in subsequent plastic products. In addition, manual mold repair is required afterward, increasing production costs.

[0005] (2) Low clamping efficiency: In this process, each inclined top needs to be tapped, glued, and cured separately. After the glue layer is cured, it needs to be corrected and positioned a second time. The glue fixation relies on manual operation, and the clamping time is long.

[0006] Therefore, in view of the problems of unreliable fixing and low clamping efficiency in the current inclined top EDM fixing process, it is urgent to develop a new machine or a new technology to solve the above problems. Utility Model Content

[0007] The purpose of this utility model is to provide a fixture for inclined ejector EDM, which aims to solve or at least partially solve the shortcomings of the above-mentioned background technology. It can not only achieve a tight fit between the inclined ejector and the rear mold core to prevent the inclined ejector from loosening during EDM, but also improve the processing efficiency and processing quality of inclined ejector EDM.

[0008] This utility model provides a fixture for inclined ejector EDM, used to assist in the tight fit between the inclined ejector and the rear mold core. The inclined ejector includes an inclined ejector rod and a pull rod. One end of the pull rod is snapped into the inclined ejector rod, and the other end of the pull rod is provided with an anti-detachment part. The anti-detachment part has a mating surface and includes a support mechanism and a tight fit mechanism. The support mechanism includes a base plate and a support column. The support column is fixed on the upper surface of the base plate and is used to support and fix the rear mold core. The upper surface of the base plate is provided with a pre-positioning structure for positioning the pull rod. The tight fit mechanism includes a pressure plate and an adjusting bolt. The pressure plate is detachably set above the base plate and can be controlled to move closer to or further away from the base plate by the adjusting bolt. The pressure plate has a first through hole through which the pull rod can pass. The pressure plate is used to press the pull rod. The lower surface of the pressure plate is recessed with a positioning groove for positioning the pull rod, and the positioning groove is connected to the first through hole. The positioning groove has a positioning surface that mates with the mating surface.

[0009] Furthermore, the distance L1 from the axis of the first through hole to the positioning surface is equal to the distance L2 from the axis of the pull rod to the mating surface.

[0010] Furthermore, a chamfered structure is provided at the corner where the lower surface of the pressure plate meets the positioning groove.

[0011] Furthermore, the pressure plate has a second through hole that mates with the support column, and the support column passes through the second through hole.

[0012] Furthermore, the upper surface of the base plate is recessed with a limiting groove that cooperates with the support column. The lower end of the support column is inserted into the limiting groove, and one limiting groove corresponds to one second through hole and is coaxially arranged.

[0013] Furthermore, the base plate is provided with trash nails, which have pads and screws, and the pads are fixed to the upper surface of the base plate by the screws.

[0014] Furthermore, the sum of the height h1 of the pad and the groove depth h2 of the positioning groove is equal to the height H of the anti-detachment part.

[0015] Furthermore, the prepositioning structure is a magnetic block, which is embedded on the upper surface of the base plate and used to attract the pull rod. The magnetic block is set in a one-to-one correspondence with the first through hole.

[0016] Furthermore, the pre-positioning structure is a positioning protrusion, which forms a circular positioning area and is used to position the pull rod. The positioning protrusion is set in a one-to-one correspondence with the first through hole.

[0017] Furthermore, the diameter d of the positioning area is equal to the maximum length D of the cross-section of the anti-slip part.

[0018] The inclined ejector EDM fixture provided in this embodiment achieves secondary positioning of the pull rods through the cooperation of a pre-positioning structure and a positioning groove, ensuring precise engagement of the anti-detachment part of the pull rods with the pressure plate. Furthermore, the cooperation of the pressure plate and the height adjustment bolt allows the pressure plate to simultaneously press multiple pull rods together, achieving a tight fit between the pull rods and the inclined ejector. This prevents the inclined ejector from loosening due to high-frequency vibrations generated during EDM, thus ensuring the machining quality of the inclined ejector. In addition, the clamping operation of this inclined ejector EDM fixture is simple, greatly shortening the clamping time and improving machining efficiency. Therefore, this inclined ejector EDM fixture not only achieves a tight fit between the inclined ejector and the rear mold core, preventing the inclined ejector from loosening during EDM, but also improves the machining efficiency and quality of inclined ejector EDM. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a jig for inclined top electrical discharge machining in Embodiment 1 of this utility model.

[0021] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the fixture used for inclined top electrical discharge machining.

[0022] Figure 3 for Figure 2 A magnified diagram of point A in the middle.

[0023] Figure 4 for Figure 1 A schematic diagram of the pressure plate shown.

[0024] Figure 5 for Figure 4 The diagram shows the positioning groove and the anti-detachment part working together.

[0025] Figure 6 for Figure 1 A schematic diagram of the base plate shown.

[0026] Figure 7 for Figure 1 The diagram shows the clamping of the jig for angled EDM. Figure 1 .

[0027] Figure 8 for Figure 1 The diagram shows the clamping of the jig for angled EDM. Figure 2 .

[0028] Figure 9 for Figure 1 The diagram shows the clamping of the jig for angled top electrical discharge machining. Figure 3 .

[0029] Figure 10 This is a cross-sectional view of a jig for inclined top electrical discharge machining in Embodiment 2 of this utility model.

[0030] Figure 11 for Figure 10 A schematic diagram of the base plate shown.

[0031] Figure 12 for Figure 11 The diagram shows the positioning protrusion and the anti-slip part working together.

[0032] Figure 13 This is a schematic diagram of the sloping top in this utility model.

[0033] The attached diagram lists the components represented by each number as follows:

[0034] 10. Support mechanism; 11. Base plate; 111. Magnetic block; 112. Garbage nail; 1121. Pad block; 1122. Screw; 113. Limiting groove; 114. Positioning protrusion; 115. Positioning area; 12. Support column; 20. Fitting mechanism; 21. Pressure plate; 211. First through hole; 212. Positioning groove; 2121. Positioning surface; 2122. Chamfered structure; 213. Second through hole; 22. Height adjustment bolt; 30. Rear mold core; 40. Angled ejector; 41. Angled ejector rod; 411. Slot; 42. Tie rod; 421. Locking block; 422. Anti-detachment part; 4221. Fitting surface. Detailed Implementation

[0035] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0036] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and claims of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0037] The directional terms such as "up," "down," "left," "right," "front," "back," "top," and "bottom" (if present) used in the specification and claims of this utility model are defined according to the position of the structures in the drawings and the relative positions of the structures, and are only for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed in this application.

[0038] Please see Figures 1-5 and Figure 13 A fixture for inclined ejector electrical discharge machining, used to assist the inclined ejector 40 in a tight fit with the rear mold core 30.

[0039] The inclined top 40 includes an inclined top rod 41 and a pull rod 42. One end of the pull rod 42 is snapped into the inclined top rod 41. The pull rod 42 has a locking block 421. The inclined top rod 41 has a locking groove 411 that engages with the locking block 421. The locking block 421 and the locking groove 411 cooperate. The other end of the pull rod 42 is provided with an anti-detachment part 422. The anti-detachment part 422 has a contact surface 4221. In this embodiment, the cross-section of the anti-detachment part 422 is D-shaped.

[0040] The fixture for inclined top electrical discharge machining includes a support mechanism 10 and a fitting mechanism 20.

[0041] The support mechanism 10 includes a base plate 11 and a support column 12. The support column 12 is fixed to the upper surface of the base plate 11 and is used to support and fix the rear mold core 30. The upper surface of the base plate 11 is provided with a pre-positioning structure for positioning the tie rod 42.

[0042] The clamping mechanism 20 includes a pressure plate 21 and an adjusting bolt 22. The pressure plate 21 is detachably disposed above the base plate 11 and can be controlled to move closer to or further away from the base plate 11 by the adjusting bolt 22. The adjusting bolt 22 passes through the pressure plate 21 and is screwed to the base plate 11. The pressure plate 21 has a first through hole 211 through which the pull rod 42 can pass. The pressure plate 21 is used to clamp the pull rod 42. The lower surface of the pressure plate 21 has a positioning groove 212 for positioning the pull rod 42 and the positioning groove 212 is connected to the first through hole 211. The positioning groove 212 has a positioning surface 2121 that cooperates with the mating surface 4221.

[0043] As described above, the fixture for inclined ejector EDM provided in this embodiment of the present invention achieves secondary positioning of the pull rod 42 through the cooperation of the pre-positioning structure and the positioning groove 212, so that the anti-detachment part 422 of the pull rod 42 can accurately cooperate with the pressure plate 21. Furthermore, through the cooperation of the pressure plate 21 and the height adjustment bolt 22, the pressure plate 21 simultaneously presses multiple pull rods 42, achieving a tight fit between the pull rod 42 and the inclined ejector 40. This prevents the inclined ejector 40 from loosening due to high-frequency vibrations generated during EDM, thereby ensuring the processing quality of the inclined ejector 40. In addition, the clamping operation of this inclined ejector EDM fixture is simple, greatly shortening the clamping time and improving processing efficiency. Therefore, this inclined ejector EDM fixture not only achieves a tight fit between the inclined ejector 40 and the rear mold core 30, preventing the inclined ejector 40 from loosening during EDM, but also improves the processing efficiency and quality of the inclined ejector 40 during EDM.

[0044] Furthermore, please refer to Figure 5The distance L1 from the axis of the first through hole 211 to the positioning surface 2121 is equal to the distance L2 from the axis of the pull rod 42 to the mating surface 4221. This setting ensures that the anti-detachment part 422 of the pull rod 42 can be installed in the positioning groove 212, and ensures that the positioning surface 2121 and the mating surface 4221 are in contact to prevent the pull rod 42 from rotating when the inclined ejector 40 and the rear mold core 30 are tightly fitted, which would cause it to detach from the inclined ejector rod 41.

[0045] Please see Figure 3 A chamfered structure 2122 is provided at the corner of the lower surface of the pressure plate 21 and the positioning groove 212. When the pressure plate 21 presses down on the anti-detachment part 422, the chamfered structure 2122 can facilitate the anti-detachment part 422 to slide into the positioning groove 212 along the chamfered structure 2122, thereby improving the smoothness of operation and reducing the wear of the anti-detachment part 422 and the pressure plate 21.

[0046] Please see Figure 4 The pressure plate 21 has a second through hole 213 that cooperates with the support column 12. The support column 12 passes through the second through hole 213 and guides the pressure plate 21. During the process of adjusting the pressure plate 21, the pressure plate 21 can move along the extension direction of the support column 12 to achieve the stability of the movement of the pressure plate 21 and ensure that the pressure plate 21 can accurately cooperate with the anti-detachment part 422.

[0047] Furthermore, please refer to Figure 6 The upper surface of the base plate 11 is recessed with a limiting groove 113 that mates with the support column 12. The lower end of the support column 12 is inserted into the limiting groove 113. One limiting groove 113 corresponds to one second through hole 213 and is coaxially arranged. The limiting groove 113 can ensure that the support column 12 is firmly fixed on the base plate 11, thereby achieving stable support for the rear mold core 30.

[0048] Please see Figure 2 , Figure 3 and Figure 6 The base plate 11 is provided with a waste nail 112, which has a pad 1121 and a screw 1122. The pad 1121 is fixed to the upper surface of the base plate 11 by the screw 1122. When the pressure plate 21 presses the pull rod 42, the lower surface of the pressure plate 21 abuts against the upper surface of the pad 1121. The waste nail 112 leaves a gap between the pressure plate 21 and the base plate 11. This gap can accommodate foreign objects and prevent the pressure plate 21 from being affected by foreign objects, thus achieving a tight fit between the pressure plate 21 and the pull rod 42, thereby achieving a tight fit between the inclined ejector rod 41 and the rear mold core 30.

[0049] More specifically, the sum of the height h1 of the pad block 1121 and the groove depth h2 of the positioning groove 212 is equal to the height H of the anti-detachment part 422. This setting ensures that when the pressure plate 21 is pressed, the upper top wall of the positioning groove 212 abuts against the upper surface of the anti-detachment part 422, the lower surface of the anti-detachment part 422 abuts against the upper surface of the base plate 11, and the lower surface of the pressure plate 21 abuts against the upper surface of the pad block 1121, thereby achieving a tight fit between the pressure plate 21 and the pull rod 42, and thus achieving a tight fit between the inclined ejector rod 41 and the rear mold core 30.

[0050] In this embodiment, please refer to Figure 2 and Figure 6 The pre-positioning structure is a magnetic block 111, which is embedded in the upper surface of the base plate 11 and used to attract the pull rod 42. The magnetic block 111 is arranged in a one-to-one correspondence with the first through hole 211. When clamping the pull rod 42, the magnetic attraction of the magnetic block 111 is used to align the anti-detachment part 422 of the pull rod 42 with the magnetic block 111 and place it to achieve the initial fixation and positioning of the pull rod 42.

[0051] The clamping process for the fixture used in inclined top electrical discharge machining provided in this embodiment is as follows:

[0052] (1) Please refer to Figure 7 Align the pull rod 42 with the magnetic block 111 and place it on the magnetic block 111. The pull rod 42 will be attracted to the upper surface of the magnetic block 111, completing the initial positioning of the pull rod 42.

[0053] (2) Please refer to Figure 8 Install the pressure plate 21, and the tie rod 42 and support column 12 pass through the first through hole 211 and the second through hole 213 respectively, and install the height adjustment bolt 22 to keep the pressure plate 21 in an unpressurized state.

[0054] (3) Please refer to Figure 9 The rear mold core 30 is installed on the support column 12 by fasteners and the inclined ejector rod 41 is assembled. The pull rod 42 is manually adjusted to rotate so that the locking block 421 engages with the locking groove 411 of the inclined ejector rod 41. At the same time, the anti-detachment part 422 is adjusted to align with the positioning groove 212.

[0055] (4) Please refer to Figure 2 Adjust the height adjustment bolt 22 to move the pressure plate 21 downward and press the pull rod 42, thereby achieving a tight fit between the pull rod 42 and completing the clamping.

[0056] Example 2:

[0057] A fixture for inclined top electrical discharge machining (EDM) has a structure similar to that of the fixture for inclined top EDM in Example 1, except that:

[0058] Please see Figures 10-12The pre-positioning structure is a positioning protrusion 114, which forms a circular positioning area 115 and is used to position the pull rod 42. The positioning protrusion 114 is set in a one-to-one correspondence with the first through hole 211, wherein the axis of the positioning area 115 coincides with the axis of the first through hole 211.

[0059] When clamping the pull rod 42, align the anti-disengagement part 422 of the pull rod 42 with the positioning area 115 and place it to achieve the initial fixation and positioning of the pull rod 42 by the positioning protrusion 114.

[0060] Furthermore, the diameter d of the positioning area 115 is equal to the maximum length D of the cross-section of the anti-detachment part 422, so that the anti-detachment part 422 can be placed into the positioning area 115 and at the same time the positioning protrusion 114 does not interfere with the rotation adjustment of the pull rod 42.

[0061] More specifically, the height of the positioning protrusion 114 is less than the height of the pad 1121 to prevent the positioning protrusion 114 from interfering with the operation of the pressure plate 21.

[0062] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A fixture for inclined ejector electrical discharge machining, used to assist the inclined ejector (40) in a tight fit with the rear mold core (30), wherein the inclined ejector (40) includes an inclined ejector rod (41) and a pull rod (42), one end of the pull rod (42) is snapped into connection with the inclined ejector rod (41), and the other end of the pull rod (42) is provided with an anti-detachment part (422), the anti-detachment part (422) having a contact surface (4221), characterized in that, include: The support mechanism (10) includes a base plate (11) and a support column (12). The support column (12) is fixed to the upper surface of the base plate (11) and is used to support and fix the rear mold core (30). The upper surface of the base plate (11) is provided with a pre-positioning structure for positioning the tie rod (42). The fastening mechanism (20) includes a pressure plate (21) and an adjusting bolt (22). The pressure plate (21) is detachably disposed above the base plate (11) and can be controlled to move closer to or away from the base plate (11) by the adjusting bolt (22). The pressure plate (21) has a first through hole (211) through which the pull rod (42) can pass. The pressure plate (21) is used to press the pull rod (42). The lower surface of the pressure plate (21) is recessed with a positioning groove (212) for positioning the pull rod (42), and the positioning groove (212) is connected to the first through hole (211). The positioning groove (212) has a positioning surface (2121) that cooperates with the mating surface (4221).

2. The fixture for inclined top electrical discharge machining as described in claim 1, characterized in that, The distance L1 from the axis of the first through hole (211) to the positioning surface (2121) is equal to the distance L2 from the axis of the pull rod (42) to the mating surface (4221).

3. The fixture for inclined top electrical discharge machining as described in claim 1, characterized in that, The lower surface of the pressure plate (21) is provided with a chamfer structure (2122) at the corner where it meets the positioning groove (212).

4. The fixture for inclined top electrical discharge machining as described in claim 1, characterized in that, The pressure plate (21) has a second through hole (213) that cooperates with the support column (12), and the support column (12) passes through the second through hole (213).

5. The fixture for inclined top electrical discharge machining as described in claim 4, characterized in that, The upper surface of the base plate (11) is recessed with a limiting groove (113) that cooperates with the support column (12). The lower end of the support column (12) is inserted into the limiting groove (113). One limiting groove (113) corresponds to one second through hole (213) and is coaxially arranged.

6. The fixture for inclined top electrical discharge machining as described in claim 1, characterized in that, The base plate (11) is provided with a garbage nail (112), the garbage nail (112) has a pad (1121) and a screw (1122), the pad (1121) is fixed to the upper surface of the base plate (11) by the screw (1122).

7. The fixture for inclined top electrical discharge machining as described in claim 6, characterized in that, The sum of the height h1 of the pad (1121) and the groove depth h2 of the positioning groove (212) is equal to the height H of the anti-detachment part (422).

8. The fixture for inclined top electrical discharge machining as described in any one of claims 1-7, characterized in that, The prepositioning structure is a magnetic block (111), which is embedded on the upper surface of the base plate (11) and used to attract the pull rod (42). The magnetic block (111) is arranged in a one-to-one correspondence with the first through hole (211).

9. The fixture for inclined top electrical discharge machining as described in any one of claims 1-7, characterized in that, The pre-positioning structure is a positioning protrusion (114), which forms a circular positioning area (115) and is used to position the pull rod (42). The positioning protrusion (114) is set in a one-to-one correspondence with the first through hole (211).

10. The fixture for inclined top electrical discharge machining as described in claim 9, characterized in that, The diameter d of the positioning area (115) is equal to the maximum length D of the cross section of the anti-detachment part (422).

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