Axial positioning device for rotary cutter

Abstract

The axial positioning device is characterized by comprising an alignment circular truncated cone (1), a spring chuck assembly (2), an outer diameter spiral micrometer (4) and a connecting device (3), wherein the alignment circular truncated cone (1) is mounted on the outer side of one end, with a measuring anvil, of a scale holder (8) of the outer diameter spiral micrometer (4), and the measuring anvil of the outer diameter spiral micrometer (4) is detached, namely the measuring anvil is replaced by the alignment circular truncated cone (1); the tool can be rapidly installed and positioned, and the consistency of the size and the shape of a product is guaranteed.

Description

Technical Field

[0001] The present invention relates to an axial positioning device for a rotary tool, and in particular to an axial positioning device for rotary tools such as cylindrical milling cutters, reamer, countersink, tap, twist drill, center drill, reamer and the like used in processing equipment such as CNC machine tools and robots. Background Art

[0002] In the cutting process of large-scale products, CNC equipment and industrial robots are widely used as processing equipment. Their characteristics are that the processing equipment automatically completes the cutting process of product elements according to the pre-programmed processing program. After the processing equipment and processing program are fixed, the shape and size accuracy of the product is determined by the relative position accuracy of the product and the tool. If the axial position of the tool changes, it will affect the tool cutting trajectory, thereby causing changes in the shape and size of the product. Therefore, the consistency of the tool installation position directly determines the processing accuracy of the product.

[0003] At present, there are two main methods to ensure the consistent axial installation position of rotary tool: 1. Use measuring tools such as vernier depth gauge to roughly measure the extended length of the tool, then install the tool according to the measured length, and then measure the deviation of tool installation through repeated trial cutting to adjust the tool position. 2. Use customized tools to process positioning elements on the tool handle to ensure that the tool can only be installed in a fixed position.

[0004] The above two methods have the following problems: ① The method of calibrating the tool position through trial cutting is complicated to operate, inefficient, and requires high skills of the operator. It takes several hours to replace the tool. The use of customized tools to ensure consistent installation positions requires customized tools and corresponding customized fixtures. Since the production batches of customized tools and customized fixtures are very small, the manufacturing cost is very high, and the price is often several times that of large-scale general tools and fixtures. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a rotary tool axial positioning device, which can realize the rapid installation and positioning of the rotary tool and ensure the consistency of the tool axis position, that is, the extension length.

[0006] A rotary tool axial positioning device, characterized in that: it includes: a aligning circular table 1, a spring chuck assembly 2, an outer diameter micrometer 4 and a connecting device 3; wherein the aligning circular table 1 is installed at the outer side of a ruler frame 8 of the outer diameter micrometer 4 with an anvil, and the anvil of the outer diameter micrometer 4 is removed, that is, the aligning circular table 1 replaces the anvil; the spring chuck assembly 2 includes: a locking nut 5, an ER spring chuck 6 and a chuck handle 7, the locking nut 5 is connected to the chuck handle 7 by a thread, and the ER spring chuck 6 is installed in the space enclosed by the locking nut 5 and the chuck handle 7 Inside; spirally connected to the spiral rod on the outer side of the chuck handle 7, the locking nut 5 is spirally connected to the head of the ER spring chuck 6; the spring chuck assembly 2 fixes one end of the chuck handle 7 to one end of the outer diameter micrometer screw 4 with a measuring rod 41 on the ruler frame 8 through the connecting device 3, and the measuring rod 41 is inserted into the circular hole in the center of the chuck handle 7; the outer diameter micrometer screw anvil mounting hole 4 is expanded to a through hole with a diameter slightly larger than the maximum outer diameter of the tool 100 to be measured; the circular hole in the center of the truncated table 1, the inner conical surface of the chuck handle 7 of the spring chuck assembly 2 and the measuring rod 41 of the outer diameter micrometer screw 4 are strictly coaxial;

[0007] During operation, the locking nut 5 of the rotary tool positioning device is loosened, and the measuring rod 41 of the outer diameter micrometer 4 is pushed to the corresponding position according to the value of the tool's extended length, and the measuring rod 41 is locked; the tool 100 to be measured is inserted into the spring chuck assembly 2 through the aligning circular table 1, and the tool 100 to be measured is actually in contact with the end face of the measuring rod 41, and the locking nut 5 is tightened; the shank of the tool 100 to be measured is inserted into the machine tool fixture 300, so that the end face of the aligning circular table 1 is pressed and aligned with the end face 301 of the machine tool fixture, and the machine tool fixture 300 is locked; then the present invention 400 is removed to ensure that the extended length of the tool 100 to be measured is equal to the specified value.

[0008] The material of the aligning circular table 1 is bearing steel GCr15, with a heat treatment hardness of HRC61-66, and a diameter of a central circular hole is clearance-matched with a diameter of a measuring tool 100.

[0009] The chuck handle 7 is made of bearing steel GCr15, with a heat treatment hardness of HRC61-66, and the conical surface of the central tapered hole is equal to the conical angle of the outer conical surface of the ER spring chuck 6.

[0010] After the whole device is fixed, the center hole of the truncated table 1 and the center conical hole of the chuck handle 7 are aligned to ensure that the two are strictly coaxial.

[0011] The rotary tool axial positioning device involved in the present invention has simple tool installation and positioning operations, and the tool installation position repetition accuracy can reach 0.01mm. There is no need to use expensive customized tools and customized fixtures, and the tool can be quickly installed and positioned to ensure the consistency of product size and shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 , is a schematic diagram of the structure of the tool 100 to be tested installed in the present invention;

[0013] Figure 2 ,for Figure 1 A magnified view of the structure at center;

[0014] Figure 3 , structural diagram of the truncated table 1 of the present invention;

[0015] Figure 4 , structural diagram of the chuck handle of the present invention;

[0016] Figure 5 , is a schematic diagram of the relative positions of the present invention, the machine tool fixture 300 and the tool 100 to be tested during operation;

[0017] Figure 6 ,for Figure 5 A magnified view of the structure at B in the middle;

[0018] Among them, 1 is an alignment frustum, 2 is a spring chuck assembly, 3 is a connecting device, 4 is an outer diameter micrometer, 5 is a locking nut, 6 is an ER spring chuck, 7 is a chuck handle, 41 is a measuring rod, 100 is a tool to be measured, 300 is a machine tool fixture, 301 is an end face of the machine tool fixture, and 400 is the present invention. DETAILED DESCRIPTION

[0019] The rotary tool axial positioning device is composed of an alignment truncated table 1, a spring chuck assembly 2, an outer diameter micrometer 4, a connecting device 3 and a fastener. The spring chuck assembly includes: a locking nut 5, an ER spring chuck 6, and a chuck handle 7, wherein the ER spring chuck 6 is located in the space surrounded by the locking nut 5 and the chuck handle 7. The specific structure is as follows Figure 1 , 2 shown.

[0020] The alignment truncated table 1 is shaped as a cylinder connected to a "U"-shaped structure. There is a circular hole in the center of the cylinder that is slightly larger than the maximum diameter of the tool 100 to ensure that the diameter of the circular hole and the diameter of the tool 100 are clearance-matched. The circular hole is strictly coaxial with the measuring rod 41 of the outer diameter micrometer 4. This part is used to align the present invention with the fixture 300 on the machine tool. It is installed on the outer side of the ruler frame 8 of the outer diameter micrometer 1 with one end of the measuring anvil. The material is bearing steel GCr15, heat treatment hardness HRC61~66, and the specific structure is as follows Figure 3 shown.

[0021] The collet assembly 2 is used to hold the calibrated tool 100 tightly to prevent the tool from tilting or moving. The locking nut 5 and the ER collet 6 are both standardized products. The collet handle 7 is in the shape of two connected cylinders. The outer surface of the cylinder with a smaller diameter has a thread that matches the locking nut 5. There is a conical hole in the center that matches the outer conical surface of the ER collet 6. The inner conical surface of the conical hole is strictly coaxial with the measuring rod. The collet handle 7 has a structure as shown in FIG. Figure 4 As shown. The chuck handle 7 is made of bearing steel GCr15, with a heat treatment hardness of HRC61~66.

[0022] The outer diameter micrometer screw gauge 4 is used to measure the value of the extended length of the calibrated tool 100, and at the same time serves as the frame of the entire positioning device, providing an installation position for the alignment round table 1 and the spring chuck assembly 2. The outer diameter micrometer screw gauge 4 needs to be modified as follows: the anvil is removed, and the anvil mounting hole is expanded to a through hole with a diameter slightly larger than the outer diameter of the largest measured tool; the mounting hole and mounting reference surface are processed on the ruler frame 8 for mounting the alignment round table 1 and the spring chuck assembly 2.

[0023] The interference fit is adopted for the outer diameter screw micrometer 4 scale frame 8 of the truncated table 1, and the matching accuracy is H7 / p6. The coaxiality accuracy of the circular hole of the truncated table 1, the inner conical surface of the chuck handle 7 and the measuring rod 41 of the outer diameter screw micrometer 4 is φ0.08mm. In order to ensure that the center hole of the truncated table 1 and the center conical hole of the chuck handle 7 are coaxial, the matching processing is carried out after the whole device is fixed.

[0024] How to use the rotary tool axial positioning device:

[0025] Tool axial position measurement: Loosen the locking nut 5 of the rotary tool positioning device and retract the measuring rod 41 of the outer diameter micrometer 4. Insert the tool 100 to be measured from the circular hole in the center of the alignment table 1, so that the alignment table 1 and the front end surface of the machine tool fixture 300 are pressed and aligned, lock the locking spring chuck assembly 2, lock and hold the tool 100 firmly, and use the outer diameter micrometer 4 to measure the value of the tool extension length.

[0026] Tool axial position positioning:

[0027] According to the value of the tool extension length, push the measuring rod 41 of the outer diameter micrometer screw 4 to the corresponding position, and lock the position of the measuring rod 41. Insert the tool 100 to be measured into the spring chuck assembly 2 from the alignment truncated table 1, and make it actually contact with the measuring rod of the outer diameter micrometer screw 4, tighten the locking nut 5, and hold the tool 100 firmly. Insert the handle of the tool 100 into the machine tool fixture 300, and make the end face of the alignment truncated table 1 press and align with the end face of the fixture 300, and lock the machine tool fixture 300. Remove the rotary tool positioning device to ensure that the tool extension length is equal to the specified value.

[0028] When the rotary tool axial positioning device is used, the relative positions of the machine tool fixture 300, the tool 100 and the rotary tool positioning device are as follows: Figure 2 shown.

[0029] The present invention is explained by means of an embodiment.

[0030] An axial positioning device for a tool with a diameter of φ6mm to φ6.5mm and a protruding length of 20mm to 45mm is used as an example.

[0031] The outer diameter micrometer screw gauge shall be mechanical, with a measuring range of 0 to 25 mm, an accuracy of not less than 0.01 mm, and a ruler frame opening length ≥ 40 mm.

[0032] Locking nut 5, specification is ER11-A-M14×0.75, made of high-strength fastener steel SCM-440, heat treatment hardness HRC41~45.

[0033] ER spring chuck 6, specification is ER11-6~7, accuracy within grade A (0.015mm), material is spring steel 65Mn, HRC44~52.

[0034] Alignment round table 1, made of bearing steel GCr15, heat treatment hardness HRC61 ~ 66, the diameter of the middle hole is

[0035] The chuck handle is made of bearing steel GCr15, with heat treatment hardness HRC61~66; the inner cone angle is 16°±10', the surface profile is φ0.04mm, and the roughness is Ra1.6; the coaxiality between the inner cone and the outer cylindrical surface is φ0.06mm; the thread is M14×0.75 triangular thread, with an accuracy of 6h.

[0036] The outer diameter micrometer screw was modified by removing the anvil and expanding the anvil mounting hole to φ6.7±0.04, and reducing the diameter of the measuring rod to

[0037] The coaxiality between the inner conical surface of the chuck handle and the measuring rod is φ0.05; the coaxiality between the circular hole of the aligning round table 1 and the anvil mounting hole is φ0.05.

[0038] The above embodiment can ensure that the axial position accuracy of rotary tools such as cylindrical milling cutters, reamers, countersinks, taps, twist drills, center drills, and reamer drills with a diameter of φ6mm~φ6.5mm and an extension length of 20mm~45mm reaches 0.01mm, and the tool positioning and installation time is only a few minutes.

[0039] The present invention relates to an axial positioning device for a rotary tool, and in particular to an axial position positioning device for rotary tools such as cylindrical milling cutters, reamers, countersinks, taps, drills, etc. used in processing equipment such as CNC machine tools and robots. The axial positioning device for the rotary tool consists of an alignment frustum 1, a spring chuck assembly 2, an outer diameter micrometer 4, and a connecting device 3. The spring chuck assembly 2 includes: a locking nut 5, an ER spring chuck 6, and a chuck handle. The axial positioning device for the rotary tool has simple positioning operation, and the tool installation position repeatability can reach 0.01mm. There is no need to use expensive custom tools and custom fixtures, and the tool can be quickly installed and positioned to ensure the consistency of product size and shape.

Claims

1. A rotary tool axial positioning device, characterized in that it comprises an alignment truncated table (1), a spring chuck assembly (2), an outer diameter micrometer screw (4) and a connecting device (3); wherein: The aligning circular table (1) is installed at the outer side of one end of the measuring anvil of the scale frame (8) of the outer diameter micrometer screw (4), and the measuring anvil of the outer diameter micrometer screw (4) is removed, that is, the aligning circular table (1) replaces the measuring anvil; the spring chuck assembly (2) comprises: a locking nut (5), an ER spring chuck (6) and a chuck handle (7), the locking nut (5) and the chuck handle (7) are connected by threads, and the ER spring chuck (6) is installed in the space surrounded by the locking nut (5) and the chuck handle (7); the locking nut (5) is spirally connected to the spiral rod on the outer side of the chuck handle (7), and the locking nut (5) is spirally connected to the spiral rod on the outer side of the chuck handle (7). The spring chuck assembly (2) is connected to the head of the ER spring chuck (6); the spring chuck assembly (2) fixes one end of the chuck handle (7) to one end of the outer diameter micrometer (4) ruler frame (8) with a measuring rod (41) through a connecting device (3), and the measuring rod (41) is inserted into the circular hole in the center of the chuck handle (7); the measuring anvil mounting hole of the outer diameter micrometer (4) is expanded to a through hole with a diameter slightly larger than the maximum outer diameter of the tool (100) to be measured; the circular hole in the center of the truncated table (1), the inner conical surface of the chuck handle (7) of the spring chuck assembly (2) and the measuring rod (41) of the outer diameter micrometer (4) are strictly coaxial; During operation, the locking nut (5) of the rotary tool positioning device is loosened, and the measuring rod (41) of the outer diameter micrometer (4) is pushed to a corresponding position according to the value of the tool's extended length, and the measuring rod (41) is locked; the tool to be measured (100) is inserted into the spring chuck assembly (2) through the aligning truncated table (1), and the end faces of the tool to be measured (100) and the measuring rod (41) are in contact, and the locking nut (5) is tightened; the shank of the tool to be measured (100) is inserted into the machine tool fixture (300), and the end face of the aligning truncated table (1) is pressed and aligned with the end face (301) of the machine tool fixture, and the machine tool fixture (300) is locked; and then the present invention (400) is removed to ensure that the extended length of the tool to be measured (100) is equal to the specified value.

2. The rotary tool axial positioning device according to claim 1, characterized in that: The material of the aligning circular table (1) is bearing steel GCr15, with a heat treatment hardness of HRC61-66, and the diameter of the central circular hole is clearance-matched with the diameter of the measuring tool (100).

3. The rotary tool axial positioning device according to claim 1, characterized in that: The chuck handle (7) is made of bearing steel GCr15, with a heat treatment hardness of HRC61-66, and the conical surface of the central cone hole has the same conical angle as the outer conical surface of the ER spring chuck (6).

4. The rotary tool axial positioning device according to claim 1, characterized in that: After the whole device is fixed, the center hole of the round table (1) and the center conical hole of the chuck handle (7) are processed and aligned to ensure that the two are strictly coaxial.

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