A drilling tool

Abstract

The utility model belongs to the field of casting technology, and specifically discloses a drilling tool, which is used for drilling a workpiece. The drilling tool includes a positioning seat, which is detachably connected to the workpiece, and a guide hole is opened on the positioning seat, and the guide hole runs through the positioning seat; a moving mechanism, which includes a limiter and a connecting shaft, which is rotatably connected in the limiter, and a drill bit is detachably connected to the connecting shaft, and the input end of the drill bit is used for external power, and the output end of the drill bit can enter the guide hole and move along the axial direction of the guide hole. The utility model ensures the precision requirements of the drill bit in the process of forming the exhaust hole of the mud core through the positioning seat and the moving mechanism, and improves the finished product quality of the workpiece.

Description

Technical Field

[0001] The utility model relates to the technical field of casting, in particular to a drilling tool. Background Art

[0002] The core is used to form the internal structure of the casting during casting. It is usually made of raw sand and a binder. It is made by hand or machine in a core box made of wood or metal. It is placed in the mold before casting. After the molten metal is poured in and condensed, the core is removed when the sand is removed, and a cavity is formed in the casting.

[0003] In the prior art, in order to solve the quality defect of air holes in products, it is necessary to vent the core of the mud; it is difficult to design vent holes on the core box of some mud cores, so manual guide holes are chosen to vent the air in the mud core; because the precision of manual guide holes is not easy to control, it is easy to cause the guide holes to deviate or the depth does not meet the requirements, and the processed vent holes do not meet the process requirements. In view of this, the applicant proposed a drilling tool. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a drilling tool for solving the problem of low precision of the exhaust hole in the prior art when machining the clay core.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a drilling tool for drilling a workpiece, and the drilling tool comprises:

[0006] A positioning seat, the positioning seat is detachably connected to the workpiece, a guide hole is opened on the positioning seat, and the guide hole is arranged through the positioning seat;

[0007] The moving mechanism includes a limit member and a connecting shaft, the connecting shaft is rotatably connected in the limit member, a drill bit is detachably connected to the connecting shaft, the input end of the drill bit is used for external power, and the output end of the drill bit can enter the guide hole and move along the axial direction of the guide hole.

[0008] Optionally, a fixed bearing is provided in the limiting member, an inner ring of the fixed bearing is sleeved on the connecting shaft, and an outer ring of the fixed bearing is provided in the limiting member.

[0009] Optionally, a fixing groove is provided in the limiting member, a first step is provided at one end of the limiting member away from the guide hole, a second step is provided between the first step and the fixing groove, a diameter of the first step is larger than a diameter of the second step, and the fixed bearing is arranged on the first step.

[0010] Optionally, the fixed bearing is interference fit with the first step.

[0011] Optionally, a detachable connecting fixing piece is disposed on the connecting shaft, and the fixing piece can pass through the connecting shaft and abut against the drill bit.

[0012] Optionally, a mounting hole is provided on the connecting shaft, the mounting hole penetrates along the axial direction of the connecting shaft, a fixing hole is opened on the side wall of the connecting shaft, the fixing hole is connected to the mounting hole, and the drill bit is detachably connected to the connecting shaft through the mounting hole.

[0013] Optionally, the fixing piece is threadedly connected to the fixing hole, and the fixing piece can enter the fixing hole and abut against the drill bit.

[0014] Optionally, a positioning groove group is formed at one end of the positioning seat away from the moving mechanism for positioning the workpiece.

[0015] Optionally, the positioning groove group includes a transition groove and a matching groove, the transition groove is a dovetail groove, the matching groove is located between the guide hole and the transition groove, the matching groove can be sleeved on the workpiece, and the guide hole, matching groove and transition groove are connected in sequence from top to bottom.

[0016] Optionally, there is a fitting clearance between the drill bit and the guide hole, and the fitting clearance is no greater than 0.2 mm.

[0017] As described above, the drilling tool proposed by the utility model has the following beneficial effects:

[0018] (1) Compared with the prior art, the present invention can position the workpiece to be processed by providing a positioning seat, and by opening a guide hole on the positioning seat to cooperate with the drill bit, the moving mechanism is indirectly guided, so that the moving mechanism can move along the axial direction of the positioning seat, thereby effectively avoiding the problem of drill bit deviation during the guide hole and improving the accuracy of the guide hole.

[0019] (2) Compared with the prior art, the present invention also provides a limiter and a connecting shaft. After the required processing depth is set, after the processing is completed, the entire moving mechanism can no longer make axial movement due to the limiting effect of the limiter, thereby ensuring that the depth of the exhaust hole can meet the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Shown is a schematic diagram of an embodiment of the utility model during processing;

[0021] Figure 2 Shown is a schematic diagram of an embodiment of the utility model before processing;

[0022] Figure 3 Shown is a schematic diagram of an embodiment of the utility model when there is no workpiece;

[0023] Figure 4 Shown is a schematic diagram of a positioning seat in one embodiment of the utility model;

[0024] Figure 5 Shown is a schematic diagram of a position limiting member in an embodiment of the utility model;

[0025] Figure 6 Shown is a schematic diagram of a connecting shaft in an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] Positioning seat 1, guide hole 101, matching groove 102, transition groove 103, limit piece 2, fixing groove 201, first step 202, second step 203, fixed bearing 3, connecting shaft 4, mounting hole 401, fixing hole 402, fixing piece 5, drill bit 6, workpiece 7. DETAILED DESCRIPTION

[0028] The following is an explanation of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0029] It should be noted that the diagrams provided in the present embodiment are only used to illustrate the basic concept of the present invention in a schematic manner, so the diagrams only show the components related to the present invention rather than the number, shape and size of the components in the actual implementation. The type, quantity and proportion of each component in the actual implementation can be changed at will, and the layout of the components may be more complicated. The structure, proportion, size, etc. shown in the diagrams attached to this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that the present invention can be implemented, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effect and purpose that the present invention can produce. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present utility model. Changes or adjustments to their relative relationships should be regarded as the scope of the implementation of the present utility model without substantially changing the technical content.

[0030] Before describing the utility model, additional explanation is given for the application scenarios of the present application. The drilling tool proposed in the present application is suitable for processing mud cores in the casting process. It is mainly used to solve the problem of depth not meeting the requirements and low precision caused by manual drilling of mud cores. However, the drilling tool in the present application is not only suitable for mud core processing, but also can be used for processing other workpieces with processing accuracy requirements and depth requirements, so as to improve the accuracy of the processed holes and improve the quality of the finished products.

[0031] like Figure 1-Figure 6 As shown, the utility model provides a drilling tool, which is used for drilling holes in mud core processing.

[0032] In an exemplary embodiment, a drilling tool comprises:

[0033] A positioning seat 1, the positioning seat 1 is detachably connected to the workpiece 7, a guide hole 101 is opened on the positioning seat 1, and the guide hole 101 is set through the positioning seat 1;

[0034] The moving mechanism includes a limit member 2 and a connecting shaft 4, the connecting shaft 4 is rotatably connected in the limit member 2, a drill bit 6 is detachably connected to the connecting shaft 4, the input end of the drill bit 6 is used for external power, and the output end of the drill bit 6 can enter the guide hole 101 and move along the axial direction of the guide hole 101.

[0035] In this embodiment, by setting up a positioning seat 1, the workpiece 7 to be processed can be positioned, and by opening a guide hole 101 on the positioning seat 1 to cooperate with the drill bit 6, the moving mechanism is indirectly guided, so that the moving mechanism can move along the axial direction of the positioning seat 1, thereby effectively avoiding the problem of drill bit 6 deviation when the guide hole 101 is formed, and improving the accuracy of the guide hole 101.

[0036] In this embodiment, by setting the limit member 2 and the connecting shaft 4, after the required processing depth is set, after the processing is completed, the entire moving mechanism can no longer make axial movement due to the limiting effect of the limit member 2, thereby ensuring that the depth of the exhaust hole can meet the requirements.

[0037] It is worth mentioning that Figure 1 and Figure 2 As shown, before processing, the moving mechanism is located above the positioning seat 1 as a whole. During the processing, as the drill bit 6 contacts the workpiece 7, the drill bit 6 continues to move downward, and the exhaust hole is slowly formed from top to bottom until the limiting member 2 in the moving mechanism finally abuts against the positioning seat 1. Due to the action of the limiting member 2, the moving mechanism can no longer move further, so the descending height of the drill bit 6 is constant, and the part of the bottom of the drill bit 6 that passes through the matching hole is the depth of the processed exhaust hole, which can meet the depth accuracy of the exhaust hole.

[0038] In an exemplary embodiment, a fixed bearing 3 is disposed inside the limiting member 2 , an inner ring of the fixed bearing 3 is sleeved on the connecting shaft 4 , and an outer ring of the fixed bearing 3 is disposed inside the limiting member 2 .

[0039] In this embodiment, the fixed bearing 3 is provided so that the connecting shaft 4 can realize the function of rotation, and the connecting shaft 4 is used to install the drill bit 6. Therefore, when the input end of the drill bit 6 is connected to external power, it can drive the connecting shaft 4 to rotate in the fixed bearing 3.

[0040] For example, Figure 1-Figure 4 As shown, in this embodiment, a fixing groove 201 is provided in the stopper 2, which is located at the lower end surface of the stopper 2, a first step 202 is provided at one end of the stopper 2 away from the guide hole 101, a second step 203 is provided between the first step 202 and the fixing groove 201, the diameter of the first step 202 is greater than the diameter of the second step 203, and the fixed bearing 3 is arranged on the first step 202. In this embodiment, the first step 202 and the second step 203 are mainly used to fully exert the function of the fixed bearing 3, the inner ring of the fixed bearing 3 is rotatable, and the outer ring of the fixed bearing 3 needs to be fixed on the first step 202, therefore, the second step 203 can effectively prevent the inner ring of the fixed bearing 3 from contacting the first step 202, and prevent the inner ring of the fixed bearing 3 from being subjected to additional resistance during rotation.

[0041] For example, in this embodiment, the fixed bearing 3 is interference fit with the first step 202. The fixed bearing 3 needs to be installed stably, and in order to prevent it from falling off, it is installed with the limiter 2 in an interference fit manner.

[0042] In an exemplary embodiment, the connecting shaft 4 is detachably connected to a fixing member 5 , and the fixing member 5 can penetrate into the connecting shaft 4 and abut against the drill bit 6 .

[0043] The fixing member 5 in this embodiment is used to fix the drill bit 6. During specific use, it is necessary to preset the maximum depth that the bottom of the drill bit 6 can penetrate through the matching hole. The adjustment method is to fix the drill bit 6 at different positions through the fixing member 5, so as to realize the function of adjusting the depth that the drill bit 6 can enter the workpiece 7.

[0044] For example, Figure 5As shown, in this embodiment, a mounting hole 401 is provided on the connecting shaft 4, and the mounting hole 401 is axially penetrated along the connecting shaft 4, and a fixing hole 402 is provided on the side wall of the connecting shaft 4, and the fixing hole 402 is communicated with the mounting hole 401, and the drill bit 6 is detachably connected to the connecting shaft 4 through the mounting hole 401. In this embodiment, the fixing member 5 enters the fixing hole 402, and the drill bit 6 set in the mounting hole 401 is pressed tightly to prevent the drill bit 6 from moving axially and radially in the mounting hole 401, thereby ensuring the accuracy of the exhaust hole. Exemplarily, in this embodiment, the number of fixing members 5 can also be increased to improve the fixing strength of the drill bit 6.

[0045] Exemplarily, in this embodiment, the fixing member 5 is threadedly connected to the fixing hole 402, and the fixing member 5 can enter the fixing hole 402 and abut against the drill bit 6. In this embodiment, the threaded connection method can facilitate the installation and removal of the fixing member 5, and the fixing member 5 in this embodiment can use a fixing screw to tighten the drill bit 6, and a gasket is provided between the fixing member 5 and the connecting shaft 4 to prevent wear.

[0046] It is worth noting that in this embodiment, in order to facilitate the adjustment of the length, a scale can be set on the drill bit 6 to conveniently adjust the drilling depth of the drill bit 6. Specifically, the bottom surface of the positioning seat 1 can be used as a reference, and then the height of the guide hole 101 can be calculated, and the length of the drill bit 6 passing through the guide hole 101 can be calculated, that is, the exhaust hole depth.

[0047] It should also be noted that in this embodiment, there is a fitting clearance between the drill bit 6 and the guide hole 101 to enable the drill bit 6 to move axially in the guide hole 101. The fitting clearance is no greater than 0.2 mm to avoid the drill bit 6 shaking left and right due to excessive fitting clearance.

[0048] In an exemplary embodiment, a positioning groove group is formed at one end of the positioning seat 1 away from the moving mechanism for positioning the workpiece 7 .

[0049] In this embodiment, the workpiece 7 can be quickly positioned by providing a positioning groove group.

[0050] For example, Figure 6 As shown, in this embodiment, the positioning groove group includes a transition groove 103 and a matching groove 102, the transition groove 103 is a dovetail groove, the matching groove 102 is located between the guide hole 101 and the transition groove 103, the matching groove 102 can be sleeved on the workpiece 7, the guide hole 101, the matching groove 102 and the transition groove 103 are connected in sequence from top to bottom.

[0051] It is worth mentioning that Figure 1 and Figure 2As shown, in this embodiment, the opening of the transition groove 103 faces outward, and it can quickly position the workpiece 7 through the inclined surface. When the positioning is completed, the workpiece 7 enters the matching groove 102, and its top contacts the lower end surface of the guide hole 101.

[0052] Specific implementation steps: the first step is to put the positioning seat 1 onto the workpiece 7 so that the top surface of the workpiece 7 contacts the bottom surface of the guide hole 101; the second step is to set the drilling depth of the drill bit 6, install the drill bit 6 on the connecting shaft 4, and fix the drill bit 6 in a suitable place through the fixing member 5, assemble the connecting shaft 4 to the inner ring of the fixed bearing 3, and at the same time, pass the lower end of the drill bit 6 into the guide hole 101 and rest against the top surface of the workpiece 7 where a hole needs to be drilled; the third step is to start the external power to drive the drill bit 6 to rotate, and the connecting shaft 4 rotates synchronously at this time. During the drilling process of the drill bit 6, the drill bit 6 gradually moves downward, and the moving mechanism moves downward synchronously as a whole to form an exhaust hole until the bottom surface of the limit member 2 contacts the top surface of the positioning seat 1. At this time, the moving mechanism cannot move further downward, and the exhaust hole is processed. Take out the drill bit 6, remove the positioning seat 1, and then take away the workpiece 7.

[0053] In summary, the utility model ensures the accuracy requirement of the drill bit 6 during the forming process of the exhaust hole of the mud core by setting the positioning seat 1 and the moving mechanism, and improves the finished product quality of the workpiece 7 by guiding the drill bit 6 through the positioning seat 1 and limiting the moving mechanism.

[0054] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A drilling tool, used for drilling a workpiece, characterized in that: The drilling tool comprises: A positioning seat, the positioning seat is detachably connected to the workpiece, a guide hole is opened on the positioning seat, and the guide hole is arranged through the positioning seat; The moving mechanism includes a limit member and a connecting shaft, the connecting shaft is rotatably connected in the limit member, a drill bit is detachably connected to the connecting shaft, the input end of the drill bit is used for external power, and the output end of the drill bit can enter the guide hole and move along the axial direction of the guide hole.

2. The drilling tool according to claim 1, characterized in that: A fixed bearing is arranged inside the limiting member, an inner ring of the fixed bearing is sleeved on the connecting shaft, and an outer ring of the fixed bearing is arranged inside the limiting member.

3. The drilling tool according to claim 2, characterized in that: A fixing groove is provided in the limiting member, a first step is provided at one end of the limiting member away from the guide hole, a second step is provided between the first step and the fixing groove, a diameter of the first step is larger than a diameter of the second step, and the fixed bearing is provided on the first step.

4. The drilling tool according to claim 3, characterized in that: The fixed bearing is interference fit with the first step.

5. The drilling tool according to claim 1, characterized in that: The connecting shaft is detachably connected to a fixing piece, and the fixing piece can penetrate into the connecting shaft and abut against the drill bit.

6. The drilling tool according to claim 5, characterized in that: The connecting shaft is provided with a mounting hole, the mounting hole penetrates along the axial direction of the connecting shaft, the side wall of the connecting shaft is provided with a fixing hole, the fixing hole is communicated with the mounting hole, and the drill bit is detachably connected to the connecting shaft through the mounting hole.

7. The drilling tool according to claim 6, characterized in that: The fixing piece is threadedly connected to the fixing hole, and the fixing piece can enter the fixing hole and abut against the drill bit.

8. The drilling tool according to claim 1, characterized in that: A positioning groove group is formed at one end of the positioning seat away from the moving mechanism for positioning the workpiece.

9. The drilling tool according to claim 8, characterized in that: The positioning groove group includes a transition groove and a matching groove, the transition groove is a dovetail groove, the matching groove is located between the guide hole and the transition groove, the matching groove can be sleeved on the workpiece, and the guide hole, matching groove and transition groove are connected in sequence from top to bottom.

10. The drilling tool according to claim 1, characterized in that: There is a fitting clearance between the drill bit and the guide hole, and the fitting clearance is no greater than 0.2 mm.

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