Reverse boring stepped hole cutter device with cutter bit capable of being controlled to be opened and retracted

Abstract

The utility model relates to a reverse boring stepped hole tool device with a tool bit capable of being controlled to be opened and retracted, and belongs to the field of machining. The cutter device comprises a spring broach mechanism (1), a boring cutter bar (2), a boring cutter (3), a blade compression screw (4), a mechanically-clamped blade (5), a lower cutter compression screw (7), a positioning shaft (6) and a cutter handle (8). According to the utility model, the problem that due to the limitation of offset, the boring cutter bar can only select a smaller diameter, so that the rigidity is poor, and the boring cutter bar can only be used for boring stepped holes with smaller aperture difference at a low speed is solved. The utility model ensures that the effective machining size is basically constant when the boring cutter is repeatedly opened, so as to meet the fixed-size machining requirement of the cutter, fully improve the machining efficiency and prolong the service life of the cutter.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical processing, and in particular relates to a tool device for back boring step holes, the tool head of which can be controlled to open and retract. Background Art

[0002] Due to certain limitations, stepped hole parts cannot be directly Boring of the outer end of the hole must be done through Hole inner processing In this case, the back boring method must be used to complete the process. Before the back boring tool enters the small hole, the cutter head should be oriented first, and then the tool should be offset S in the opposite direction of the cutter head orientation, pass through the small hole to enter the pre-processing position, and then move S in the direction of the cutter head orientation so that the center of the cutter head coincides with the center of the hole, and then the spindle rotates forward to perform boring. After the processing is completed, the cutter head should be oriented first, and then offset S in the opposite direction of the cutter head orientation, and then the tool should be quickly withdrawn. Figure 1 shown.

[0003] The step hole of this method should satisfy: D<2d-m. The directional offset of the tool bar should satisfy: S<(dm) / 2. Where m is the diameter of the tool bar. If the traditional method is used, the directional offset of the tool bar is limited to a certain range.

[0004] The back boring process is used to process the step hole, which has certain safety issues. If the processing method is not paid attention to, it is likely to cause The holes are scratched, the processing efficiency is low, and the labor intensity of the operator is high. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] The technical problem to be solved by the utility model is how to provide a tool device for back-boring step holes with a tool head that can be controlled to open and retract, so as to solve the problems of certain safety issues, low processing efficiency and high labor intensity for operators when processing step holes using the back-boring process.

[0007] (II) Technical solution

[0008] In order to solve the above technical problems, the utility model provides a tool device for back boring step holes, the tool head of which can be controlled to open and retract, the tool device comprising: a spring broach mechanism (1), a boring bar (2), a boring tool (3), a blade clamping screw (4), a machine-clamped blade (5), a lower tool clamping screw (7), a positioning shaft (6) and a tool handle (8);

[0009] The right end of the tool handle (8) is connected to the boring bar (2), a threaded hole is arranged at the center of the right end of the boring bar (2), and a fifth through hole is arranged at the left end of the threaded hole. The spring broaching mechanism (1) comprises: a spring and a handle, the spring is arranged in the fifth through hole, the handle is screwed into the threaded hole, the right end of the spring is connected to the left end of the handle; the left end of the spring is connected to the right edge of the boring bar (2), and a lower tool clamping screw (7) is arranged below the positioning shaft (6);

[0010] The machine-clamped blade (5) is fixed to the top of the boring tool (3) by a blade clamping screw (4), and a first through hole and a second through hole are provided at the bottom of the boring tool (3), the first through hole is used to install the positioning shaft (6), and the second through hole is used to install the lower tool clamping screw (7);

[0011] A rotation space is reserved at the bottom of the boring tool (3) on the boring tool rod (2); a third through hole and a fourth through hole are arranged on the front and rear walls on the right side of the rotation space, the third through hole corresponds to the first through hole and is used to install the positioning shaft (6), and the fourth through hole corresponds to the second through hole and is used to install the lower tool clamping screw (7); a small hole is arranged on the right end wall of the rotation space for passing a spring so that the spring is connected to the right side of the boring tool rod (2).

[0012] (III) Beneficial effects

[0013] The utility model provides a tool device for back boring step holes, the tool head of which can be controlled to open and retract. The utility model processes a tool head groove on a tool rod to ensure that the tool head is smoothly retracted into the tool rod groove when the tool rod passes through a through hole, thereby realizing that the tool rod passes through the through hole smoothly.

[0014] The utility model loosens the knife pressing screw, presses the knife head control button, and adopts a spring knife pulling mechanism to realize the quick opening and retraction of the knife head.

[0015] The utility model adopts high position accuracy and matching accuracy between the positioning shaft, the boring tool rod and the boring tool, so as to ensure that the effective processing size of the boring tool is basically constant when the boring tool is repeatedly opened.

[0016] The device of the utility model realizes the "reverse boring" processing of step hole parts with relatively large hole diameter difference in a numerical control machining center, and the tool structure is reasonably designed and easy to use.

[0017] The utility model avoids the problem that the boring bar can only be selected with a smaller diameter due to the limitation of the offset, so the rigidity is poor and it can only be used for low-speed boring of step holes with smaller diameter differences.

[0018] The utility model ensures that the effective processing size of the boring cutter is substantially constant when the boring cutter is repeatedly opened, so as to meet the processing requirements of the cutter for fixed size, fully improve the processing efficiency, and simultaneously increase the service life of the cutter. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a schematic diagram of a processing device in the prior art;

[0020] Figure 2 This is a schematic diagram of the overall structure of the tool of the utility model;

[0021] Figure 3 It is an enlarged schematic diagram of the spring broach mechanism of the utility model (a cross-sectional view along the axis of the arbor).

[0022] In the figure, 1- spring broach mechanism 2- boring bar 3- boring tool 4- blade clamping screw 5- machine clamping blade 6- boring tool rotating shaft 7- lower tool clamping screw 8- tool handle 9- upper tool clamping screw 10- spring winding wire 11- spring 12- threaded rotating handle 13- knife groove 14- wire winding tool connecting screw 15- wire winding box 16, wire winding box fixing plate 17- spring connecting ball. DETAILED DESCRIPTION

[0023] In order to make the purpose, content and advantages of the utility model clearer, the specific implementation methods of the utility model are further described in detail below in conjunction with the drawings and embodiments.

[0024] The purpose of the utility model is to provide a high-efficiency and fast tool device for back-boring step holes with a controllable opening and retraction of the tool head. By analyzing the structural characteristics of deep cavity box parts, and considering that the deep cavity is difficult to observe and inconvenient to operate, the tool structure is optimized and a tool head adjustable telescopic device is designed to ensure that the tool head retracts quickly when the tool passes through the hole, so as to achieve efficient, high-quality and low-cost processing of the hole on the machining center, reflecting the efficient and humanized characteristics of the machining center.

[0025] In order to realize the "reverse boring" of the above-mentioned step hole on the machining center, it is ensured that the boring bar does not need to allow the tool to pass smoothly. Hole inner processing Holes, designed as Figure 2 The tool device shown comprises: a spring broach mechanism (1), a boring bar (2), a boring tool (3), a blade clamping screw (4), a machine-clamped blade (5), a lower tool clamping screw (7), a positioning shaft (6) and a tool handle (8).

[0026] The right end of the tool handle (8) is connected to the boring bar (2), a threaded hole is arranged at the center of the right end of the boring bar (2), and a fifth through hole is arranged at the left end of the threaded hole. The spring broaching mechanism (1) comprises: a spring and a handle, the spring is arranged in the fifth through hole, the handle is screwed into the threaded hole, the right end of the spring is connected to the left end of the handle; the left end of the spring is connected to the right edge of the boring bar (2), and a lower tool clamping screw (7) is arranged below the positioning shaft (6);

[0027] The machine-clamped blade (5) is fixed to the top of the boring tool (3) by a blade clamping screw (4). A first through hole and a second through hole are provided at the bottom of the boring tool (3). The first through hole is used to install a positioning shaft (6), and the second through hole is used to install a lower tool clamping screw (7).

[0028] A rotation space is reserved at the bottom of the boring tool (3) on the boring tool rod (2); a third through hole and a fourth through hole are arranged on the front and rear walls on the right side of the rotation space, the third through hole corresponds to the first through hole and is used to install the positioning shaft (6), and the fourth through hole corresponds to the second through hole and is used to install the lower tool clamping screw (7); a small hole is arranged on the right end wall of the rotation space for passing a spring so that the spring is connected to the right side of the boring tool rod (2).

[0029] The boring tool (3) is a machine-clamped indexable sizing tool and can rotate along a positioning shaft (6).

[0030] A straight groove is machined on the boring bar (2), the length and width of which are slightly larger than the size of the boring tool (3) for use when the tool is retracted; this avoids the situation where the boring bar (2) can only be selected with a smaller diameter due to the limitation of the offset, thus having poor rigidity and can only be used for low-speed boring of step holes with smaller diameter differences.

[0031] Embodiment 1:

[0032] like Figure 3 As shown, the tool head of the utility model can control the opening and retraction of the reverse boring step hole tool device, and also includes: an upper tool clamping screw (9) and a spring reel (10).

[0033] The bottom rotation space of the boring tool (3) is a retracting groove of the boring tool (3) arranged on the boring tool rod (2).

[0034] The upper tool clamping screw (9) and the lower tool clamping screw (7) are symmetrically arranged on the upper and lower sides of the positioning shaft (6).

[0035] A fifth through hole is arranged on the right side of the retraction groove, a small hole communicating with the retraction groove is arranged at the left end of the fifth through hole, and a hole through which a handle passes is arranged at the right end, and the handle is a threaded rotating handle (12).

[0036] A wire winding box (15) is arranged in the fifth through hole. The wire winding box (15) is connected to the top and bottom of the fifth through hole via a wire winding box fixing plate (16). A spring wire winding (10) is arranged in the wire winding box (15).

[0037] The left end of the spring wire coil (10) passes through the wire coil box (15) and the small hole to connect the boring tool (3) through the wire coil tool connecting screw (14), and the right end passes through the wire coil box (15) to connect the spring (11), and the right end of the spring (11) is connected to the spring connecting ball (17) at the left end of the threaded rotating handle (12).

[0038] Embodiment 2:

[0039] The utility model adopts a tool device for back boring step holes that can control the opening and retraction of the tool head, and the processing steps are as follows:

[0040] S1. Before boring, loosen the tool clamping screws 7 and 9, rotate the threaded rotating handle 12 counterclockwise to relax the spring reel 10. The tool falls into the tool receiving groove 13 by its own weight by using the eccentric positioning shaft 6 and the arc at the bottom of the tool. The boring tool 3 is first retracted into the groove by the spring broaching mechanism 1. When the machine tool executes the program, the spindle reaches the same coordinate position as the boring hole, and the boring tool bar 2 is removed from the processed After passing through a certain distance in the hole, the machine tool is paused through program setting, and the operator rotates the threaded rotating handle 12 clockwise to keep the spring reel 10 in a continuously tightened state, and pulls the tool to pop out around the eccentric positioning shaft 6. The spring broaching mechanism opens the boring tool 3 to the state shown in the figure, and the back face of the boring tool is aligned with the corresponding positioning surface of the boring bar 2 (at this time, the front face of the boring tool is perpendicular to the spindle axis), and then the tool is clamped with the clamping screws 7 and 9;

[0041] S2. Execute the program to make the spindle rotate at a certain speed and move back a certain distance evenly, using the "back boring" method for processing The program is executed to move the tool bar 2 forward. When it reaches the manual opening position, the machine tool is still paused through the program setting, and the above retraction action is repeated. The boring tool 3 is manually retracted, and the clamping screw 7 is tightened to fix the boring tool in the groove on the boring tool bar;

[0042] S3, continue to execute the program, and withdraw the tool bar 2. Since the position accuracy and matching accuracy between the eccentric positioning shaft 6 and the boring bar 2 and the boring tool 3 are high, it can ensure that the effective processing size of the boring tool 3 is basically constant when it is repeatedly opened, so as to meet the tool sizing processing requirements, fully improve the processing efficiency, and at the same time increase the life of the tool.

[0043] The utility model processes a cutter head groove on the cutter bar, so as to ensure that the cutter head is smoothly retracted into the cutter bar groove when the cutter bar passes through the through hole, and the cutter bar can smoothly pass through the through hole.

[0044] The utility model loosens the knife pressing screw, presses the knife head control button, and adopts a spring knife pulling mechanism to realize the quick opening and retraction of the knife head.

[0045] The utility model adopts high position accuracy and matching accuracy between the positioning shaft, the boring tool rod and the boring tool, so as to ensure that the effective processing size of the boring tool is basically constant when the boring tool is repeatedly opened.

[0046] The device of the utility model realizes the "reverse boring" processing of step hole parts with relatively large hole diameter difference in a numerical control machining center, and the tool structure is reasonably designed and easy to use.

[0047] The utility model avoids the problem that the boring bar can only be selected with a smaller diameter due to the limitation of the offset, so the rigidity is poor and it can only be used for low-speed boring of step holes with smaller diameter differences.

[0048] The utility model ensures that the effective processing size of the boring cutter is substantially constant when the boring cutter is repeatedly opened, so as to meet the processing requirements of the cutter for fixed size, fully improve the processing efficiency, and simultaneously increase the life of the cutter.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A tool device for back boring step holes, wherein the tool head can be controlled to open and retract, characterized in that: The tool device comprises: a spring broach mechanism (1), a boring bar (2), a boring tool (3), a blade clamping screw (4), a machine-clamped blade (5), a lower tool clamping screw (7), a positioning shaft (6) and a tool handle (8); The right end of the tool handle (8) is connected to the boring bar (2), a threaded hole is arranged at the center of the right end of the boring bar (2), and a fifth through hole is arranged at the left end of the threaded hole. The spring broaching mechanism (1) comprises: a spring and a handle, the spring is arranged in the fifth through hole, the handle is screwed into the threaded hole, the right end of the spring is connected to the left end of the handle; the left end of the spring is connected to the right edge of the boring bar (2), and a lower tool clamping screw (7) is arranged below the positioning shaft (6); The machine-clamped blade (5) is fixed to the top of the boring tool (3) by a blade clamping screw (4), and a first through hole and a second through hole are provided at the bottom of the boring tool (3), the first through hole is used to install the positioning shaft (6), and the second through hole is used to install the lower tool clamping screw (7); A rotation space is reserved at the bottom of the boring tool (3) on the boring tool rod (2); a third through hole and a fourth through hole are arranged on the front and rear walls on the right side of the rotation space, the third through hole corresponds to the first through hole and is used to install the positioning shaft (6), and the fourth through hole corresponds to the second through hole and is used to install the lower tool clamping screw (7); a small hole is arranged on the right end wall of the rotation space for passing a spring so that the spring is connected to the right side of the boring tool rod (2).

2. The tool head can be controlled to open and retract the back boring step hole tool device as claimed in claim 1, characterized in that: The boring tool (3) is a machine-clamped indexable sizing tool and can rotate along a positioning shaft (6).

3. The tool head can be controlled to open and retract the back boring step hole tool device as claimed in claim 1, characterized in that: A straight groove is machined on the boring tool bar (2), the length and width of which are greater than the size of the boring tool (3) for use when the tool is retracted.

4. The tool head can be controlled to open and retract the back boring step hole tool device as described in any one of claims 1 to 3, characterized in that: The tool device also includes an upper tool clamping screw (9) and a spring coil (10).

5. The tool head can be controlled to open and retract the back boring step hole tool device as claimed in claim 4, characterized in that: The bottom rotation space of the boring tool (3) is a retracting groove of the boring tool (3) arranged on the boring tool rod (2).

6. The tool head can be controlled to open and retract the back boring step hole tool device as claimed in claim 5, characterized in that: The upper tool clamping screw (9) and the lower tool clamping screw (7) are symmetrically arranged on the upper and lower sides of the positioning shaft (6).

7. The tool head can be controlled to open and retract the back boring step hole tool device as claimed in claim 5, characterized in that: A fifth through hole is arranged on the right side of the retracting groove, a small hole communicating with the retracting groove is arranged at the left end of the fifth through hole, and a hole through which the handle passes is arranged at the right end.

8. The tool head can be controlled to open and retract the back boring step hole tool device as claimed in claim 7, characterized in that: The handle is a threaded rotating handle (12).

9. The tool head can be controlled to open and retract the back boring step hole tool device as claimed in claim 7, characterized in that: A wire winding box (15) is arranged in the fifth through hole. The wire winding box (15) is connected to the top and bottom of the fifth through hole via a wire winding box fixing plate (16). A spring wire winding (10) is arranged in the wire winding box (15).

10. The tool head can be controlled to open and retract the back boring step hole tool device as claimed in claim 9, characterized in that: The left end of the spring wire coil (10) passes through the wire coil box (15) and the small hole to connect the boring tool (3) through the wire coil tool connecting screw (14), and the right end passes through the wire coil box (15) to connect the spring (11), and the right end of the spring (11) is connected to the spring connecting ball (17) at the left end of the threaded rotating handle (12).

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