Nested drill bushing device

Abstract

The utility model relates to the technical field of die-casting die deep hole machining drilling tools, in particular to a nested drill bushing device which comprises a positioning portion and a guide portion fixed on the positioning portion, the positioning portion and the guide portion are both of a square structure, a through guide hole is formed in the guide portion, and the guide hole is communicated with the positioning portion. The guide hole is formed in the radial direction of the guide part, a positioning notch is further formed in the end portion of the end, away from the guide part, of the positioning part, and a positioning block is arranged in the positioning notch. According to the scheme, better size precision and smoothness can be obtained, the location degree of the deep hole is controlled within the range, and the deep hole machining quality and machining efficiency are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of die casting die deep hole processing drilling device, concretely is a nested drilling bush device. BACKGROUND

[0002] In the die casting forming process, the product often contains deep hole structure, these deep holes usually utilize the core-pulling of rod type to form, when the product is die cast, the core-pulling is extracted from the product, and the deep hole structure is naturally formed on the product, thereby meeting the forming requirement.

[0003] After the deep hole is formed, the deep hole needs to be further processed, such as pre-drilling the deep hole, and using the electric discharge machining method to ensure the size accuracy, roughness accuracy and the like of the deep hole. At this time, the electric discharge machining needs a longer electrode, but the too long electrode will make it difficult to guarantee the position degree and roughness of the deep hole after processing, and the processing time is long and the cost is high.

[0004] Therefore, in addition to the electric discharge machining, a special drilling die can also be used to process the deep hole, such as the prior art "a die pin deep hole processing drilling device" (publication number: CN202062097U), which uses a long drill bit to process the deep hole of the product, and in order to ensure that the drill bit does not bend and swing during work, a bearing for guiding is arranged on the rod part of the drill bit to increase the stability of the drill bit and ensure the drilling accuracy.

[0005] The prior art uses a bearing as a guide device for the drill bit, the drill bit is arranged in the inner ring of the bearing, and the outer ring of the bearing is circular, which is difficult to fix, and because the inner ring and the outer ring of the bearing are provided with rollers, there are gaps between the rollers and the inner ring and the outer ring of the bearing. SUMMARY

[0006] The nested drilling bush device can solve the poor guiding effect of the drill bit in the prior art, the poor accuracy and large roughness of the drilled deep hole, and the difficulty in meeting the position degree requirement of deep hole processing.

[0007] The application provides the following technical scheme: a nested drill sleeve device, comprising a positioning part and a guide part fixed on the positioning part, the positioning part and the guide part are both square body structures, a through guide hole is formed on the guide part, the guide hole is formed along the radial direction of the guide part, a positioning notch is further arranged on the end of the positioning part away from the guide part, and a positioning block is arranged in the positioning notch; the size tolerance of the guide hole is controlled to be 0.01mm-0.03mm, and the heat treatment hardness of the positioning part and the guide part is 50HRC-55HRC.

[0008] Beneficial effects:

[0009] 1. The quality and efficiency of deep hole machining are improved. When the drill sleeve is installed, the outer peripheral surface of the guide part is embedded in the installation groove at the bottom of the mold, the installation and fixation of the drill sleeve and the mold are realized, the positioning part is prevented from loosening due to the action force of the drill bit during drilling, the stability of the positioning part and the guide part is ensured, when the drill bit rotates in the guide hole, even if the drill bit bends and swings, the guide part will not be touched, but will be forced to be aligned, the guiding effect is increased, the positioning block is clamped into the positioning notch on the end of the positioning part, the position of the positioning part is limited, in addition, since the drill sleeve is installed from the bottom of the mold, the positioning block can prevent the drill sleeve from slipping off from the bottom of the mold during hoisting of the mold, at the same time, the positioning part and the guide part are both square body structures, the rigidity of the guide part can be improved, the guiding performance of the drill bit is further improved, compared with the electrical discharge machining technology, the hole wall quality of the present application is better, the machining efficiency is higher, the machining efficiency of a single hole is improved by 5 times, compared with the prior art, the present application can obtain better size accuracy and smoothness, and the position accuracy of the deep hole is controlled to be within 0.01mm-0.03mm, the quality and efficiency of deep hole machining are improved.

[0010] 2. The machining precision of the deep hole is improved. By controlling the size tolerance of the guide hole to be 0.01mm-0.03mm, the guiding precision of the drill sleeve to the drill bit can be improved, and then the size precision and position precision of the machined deep hole are improved.

[0011] 3. The guiding stability of the drill sleeve is improved, and the service life of the drill sleeve is improved. By controlling the hardness of the drill sleeve, the hardness of the drill sleeve is higher than the hardness of the mold (the hardness of the mold in the present application is 44HRC-48HRC), so that the strength of the drill sleeve is improved, and the service life of the drill sleeve is prolonged.

[0012] ​4. Ensure the straightness of deep hole machining and the position of the hole bottom. Because in conventional machining, the drill bit needs to be drilled from the outer periphery of the mold to the bottom of the part hole, the whole deep hole machining length is longer, and the drill bit is longer, so it is difficult to ensure the straightness after deep hole machining, and after using the drill sleeve, the drill sleeve can form a support point for the rod part of the drill bit, shorten the machining length of the hole, and the drill bit is more stable during drilling, and the precision of the deep hole between the drill sleeve and the part hole bottom is easier to ensure, thereby effectively improving the straightness after deep hole machining and the position of the hole bottom.

[0013] Further, the outer peripheral size of the guide portion is larger than the outer peripheral size of the positioning portion.

[0014] Beneficial effect: Since the drill sleeve is installed by embedding the outer peripheral surface of the guide portion in the installation groove at the bottom of the mold, the outer peripheral size of the guide portion is larger than the outer peripheral size of the positioning portion, so that only the machining precision of the outer peripheral surface of the guide portion needs to be controlled when the drill sleeve is fixed, thereby reducing the machining difficulty of the whole drill sleeve, shortening the mating surface of the whole drill sleeve and the mold, and improving the installation convenience.

[0015] Further, the outer peripheral edges of the positioning portion and the guide portion are circular arc surfaces.

[0016] Beneficial effect: The long edge of the positioning portion is a circular arc surface, which can prevent bumping and improve safety.

[0017] Further, the inner wall surface of the positioning notch is a circular arc surface.

[0018] Beneficial effect: The circular arc surface provides a softer guiding effect, which helps to reduce deviation during assembly of the positioning block; even if there is a slight assembly error, the circular arc surface can provide certain compensation effect to ensure the accuracy of the final position and improve fault tolerance; It can also reduce the possibility of jamming during disassembly, making the operation smoother.

[0019] Further, a stepped counterbore is also provided on the positioning block.

[0020] Beneficial effect: The stepped counterbore is used to insert a screw and fix the mold, so that the position of the positioning block is locked, and the convenience of assembling the positioning block is improved.

[0021] Further, a threaded hole is provided at the center of the positioning portion.

[0022] Beneficial effect: The threaded hole can be screwed into the threaded hole of the positioning portion, which facilitates easy disassembly and assembly of the drill sleeve.

[0023] Further, the guide portion is detachably connected to the positioning portion, the positioning portion is provided with a concave hole, and the guide portion is provided with a protrusion, which is embedded in the concave hole to realize the connection and fixation of the guide portion and the positioning portion.

[0024] The guiding part can be detachably connected with the positioning part, so that the guiding part is convenient to disassemble and replace, the guiding part is correspondingly arranged according to drill bits of various different sizes, and applicability is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a perspective view of the utility model.

[0026] Figure 2 It is Figure 1 It is a perspective view of the utility model after the positioning block is removed. DETAILED DESCRIPTION

[0027] The following is further explained in detail through specific embodiments:

[0028] The marks in the drawings of the specification include: a guiding part 1, a positioning part 2, a threaded hole 3, a positioning block 4, a stepped counterbore 5, and a positioning notch 6.

[0029] Embodiment one

[0030] As Figure 1 and Figure 2 shown, a nested drill sleeve device includes a positioning part 2 and a guiding part 1 fixed on the positioning part 2, the positioning part 2 and the guiding part 1 are integrally formed, a through guiding hole is formed on the guiding part 1 and is formed along the radial direction of the guiding part 1, a positioning notch 6 is further arranged on the end of the end of the positioning part 2 away from the guiding part 1, and a positioning block 4 is arranged in the positioning notch 6; in the embodiment, the diameter of the guiding hole is 14.01mm-14.03mm, and the hardness of the positioning part 2 and the guiding part 1 is 50HRC-55HRC.

[0031] The positioning part 2 and the guiding part 1 are both square body structures, and the outer peripheral edges of the positioning part 2 and the guiding part 1 are circular arc surfaces. The circular arc surfaces help prevent bumping when the positioning part 2 is installed, thereby improving safety.

[0032] The outer peripheral size of the guiding part 1 is greater than the outer peripheral size of the positioning part 2. Since the drill sleeve is installed by embedding the outer peripheral surface of the guiding part 1 in the installation groove at the bottom of the mold, the outer peripheral size of the guiding part 1 is greater than the outer peripheral size of the positioning part 2, so that only the outer peripheral surface machining precision of the guiding part 1 needs to be controlled when the drill sleeve is fixed, thereby reducing the machining difficulty.

[0033] A threaded hole 3 is further arranged on the central part of the positioning part 2, a screw rod can be screwed into the threaded hole 3 of the positioning part 2, the drill sleeve is convenient to separate from the mold, and the drill sleeve is convenient to disassemble and assemble.

[0034] The positioning gap 6 is semi-long strip-shaped, and the inner wall surface of the positioning gap 6 and the outer peripheral surface of the positioning block 4 are arc surfaces, which provide a softer guiding effect, and help to reduce deviation during assembly of the positioning block 4; even if there is slight assembly error, the arc surfaces can provide certain compensation effect, ensure the accuracy of the final position, and improve fault tolerance; and the arc surfaces can also reduce the possibility of jamming during disassembly, and make the operation more smooth.

[0035] The positioning block 4 is further provided with a stepped counterbore 5, which is used for inserting a screw and fixing the mold, so that the position of the positioning block 4 is locked, and the convenience of assembly of the positioning block 4 is improved.

[0036] The use method of the drill sleeve is as follows:

[0037] During installation, the guide part 1 is embedded in the installation groove provided in the bottom of the mold, the outer peripheral surface of the guide part 1 and the inner wall surface of the mold installation groove are controlled according to a single-sided gap of 0-0.015 mm, the four arc surfaces of the outer periphery of the guide part 1 and the inner wall of the mold installation groove are provided with a gap of greater than 0.5 mm, then the positioning block 4 is placed on the corresponding installation hole position of the mold, one end of the positioning block 4 is located in the positioning gap 6, then the screw is locked into the stepped counterbore 5 and the mold is fixed, so that the positioning block 4 can clamp the drill sleeve, and when the mold is hoisted, since the positioning part 2 faces downward, the positioning block 4 can prevent the drill sleeve from falling off the mold. When drilling is needed, the drill bit is inserted into the installation hole of the mold and penetrates the guide hole to drill the deep hole of the product, and when the drill bit rotates in the guide hole, even if the drill bit bends and swings, it will not touch the guide part 1, but will be forced to be aligned by the guide hole, thereby increasing the guiding effect; at the same time, the positioning part 2 and the guide part 1 are both square body structures, which can improve the rigidity of the guide part 1 and further improve the guiding performance of the drill bit, the scheme can ensure that better size accuracy and smoothness are obtained, and the deep hole position degree is controlled to be less than or equal to 0.01 mm, thereby effectively improving the deep hole machining quality and machining efficiency.

[0038] Embodiment Two

[0039] The difference between this embodiment and embodiment one is that the positioning part 2 and the guide part 1 are separately provided, the positioning part 2 is provided with a concave hole, and the guide part 1 is provided with a protrusion, the protrusion is embedded in the concave hole to realize connection and fixation of the guide part 1 and the positioning part 2. Thus, the guide part 1 and the positioning part 2 can be detachably connected, so as to facilitate disassembly and replacement of the guide part 1, so as to correspondingly provide the guide part 1 according to drill bits of various different sizes, and improve the applicability.

[0040] ​The above is only an embodiment of the present application, and the present application is not limited to the field of the embodiment, and the common knowledge such as specific structures and properties in the scheme is not described in detail herein. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope claimed in the present application should be subject to the content of the claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A nested drill bushing apparatus, characterized by, The positioning part and the guiding part are both square body structures, a through guiding hole is formed in the guiding part, the guiding hole is formed along the radial direction of the guiding part, an end of the positioning part away from the guiding part is further provided with a positioning notch, and a positioning block is arranged in the positioning notch; the size tolerance of the guiding hole is controlled within 0.01mm-0.03mm, and the heat treatment hardness of the positioning part and the guiding part is 50HRC-55HRC.

2. A nested drill bushing apparatus according to claim 1, wherein: The outer peripheral size of the guiding part is larger than that of the positioning part.

3. A nested drill bushing apparatus as defined in claim 2, wherein: The outer peripheral surfaces of the positioning part and the guiding part are circular arc surfaces.

4. A nested drill bushing apparatus according to claim 3, wherein: The inner wall surface of the positioning notch is a circular arc surface.

5. A nested drill bushing apparatus as defined in claim 4, wherein: A stepped counterbore is further formed in the positioning block.

6. A nested drill bushing apparatus as defined in claim 5, wherein: A threaded hole is further arranged in the center of the positioning part.

7. The nested drill bushing apparatus of claim 1, wherein: The guiding part is detachably connected to the positioning part, a concave hole is arranged on the positioning part, a protrusion is arranged on the guiding part, and the protrusion is embedded in the concave hole to realize the connection and fixation of the guiding part and the positioning part.

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