Post-pulling type milling cutter head

Abstract

The utility model relates to the technical field of milling cutter heads, in particular to a rear pull type milling cutter head which comprises a cutter bar body and a milling cutter module, a hollow hole of a hollow structure is formed in the cutter bar body, a first inner threaded hole is formed in one end of the hollow hole, a rear pull rod is movably installed in the hollow hole, and a first outer threaded structure is formed at the rear end of the rear pull rod. A second inner threaded hole is formed in the front end of the rear pull rod, the milling cutter module comprises a built-in connecting rod and a milling cutter block, and a second outer threaded structure matched with the second inner threaded hole is formed in the inner end of the built-in connecting rod; the thread pitch of the first external thread structure is smaller than that of the second external thread structure; when the milling cutter module is installed, the rear pull rod is rotated, so that the rear pull rod is matched with the first inner threaded hole of the hollow hole through the first outer threaded structure, the milling cutter block is pulled back to be installed in the cutter bar body, and the rear pull rod is screwed to drive the built-in connecting rod to walk backwards and lock the milling cutter block according to the screw pitch difference and different walking distances of the rear pull rod and the cutter bar body. And the milling cutter head can be quickly replaced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a milling cutter head technical field especially relates to a rear pull type milling cutter head. BACKGROUND

[0002] Milling cutter is widely used in metal milling processing, through the milling cutter of different shape type, can mill out the groove, chamfer and to the workpiece remove the roughcast, perforation etc.

[0003] Milling cutter works, each tooth cuts the excess of workpiece in turn intermittently. Milling method relative to the feed direction of workpiece and the rotation direction of milling cutter has two kinds of milling and reverse milling:

[0004] Milling: the rotation direction of milling cutter and the feed direction of cutting are same, the milling cutter bites the workpiece and cuts the last cutting chip when starting cutting. The cutting effect of milling is best, usually first choice milling, but if the machine tool has thread gap problem or has the problem that milling cannot solve, then consider reverse milling.

[0005] Reverse milling: the rotation direction of milling cutter and the feed direction of cutting are opposite, the milling cutter must slide on the workpiece before starting cutting, with zero cutting thickness at the beginning, and the cutting thickness reaches the maximum at the end.

[0006] Milling cutter head is installed on the cutter bar, the existing milling cutter head usually adopts the mode of bolt connection with the cutter bar, that is, the milling cutter head is connected with the inner thread structure of the cutter bar through the outer thread structure, since the milling cutter head vibrates greatly during milling, the phenomenon of loosening is easy to appear, leading to the falling of the milling cutter head. INVENTION CONTENTS

[0007] The utility model aims at the deficiency of prior art to provide a rear pull type milling cutter head.

[0008] In order to realize the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0009] The rear pull type milling cutter head, including cutter bar body and the milling cutter module that cooperates with cutter bar body, the hollow hole of the hollow structure is formed to cutter bar body, the first internal thread hole is formed to one end of hollow hole, the rear pull rod is movably installed in hollow hole, the first external thread structure that cooperates with first internal thread hole is formed to rear pull rod rear end, the second internal thread hole is formed to rear pull rod front end, the milling cutter block that installs to built-in connecting rod outer end is included in built-in connecting rod that inserts to hollow hole, the second external thread structure that cooperates with second internal thread hole is formed to built-in connecting rod inner end, wherein the pitch of first external thread structure is less than the pitch of second external thread structure.

[0010] Further, the milling cutter block includes a mounting head and a connecting column formed on the mounting head, the connecting column is connected with the built-in connecting rod, and the mounting head is in abutment with the hollow hole.

[0011] Further, the connecting column is coaxially connected with the built-in connecting rod to form a circular truncated cone structure.

[0012] Further, the first central hole is axially formed in the milling cutter block, and the second central hole is axially formed in the built-in connecting rod.

[0013] Further, the third central hole is axially formed in the rear pull rod, and the third central hole is coaxially aligned with the second central hole.

[0014] Further, the connecting head is formed at the rear end of the rear pull rod, and the first external thread structure is formed in the connecting head.

[0015] Further, the connecting recess is an internal hexagonal groove.

[0016] Further, the first external thread structure of the rear pull rod has a pitch of 1 mm, and the second external thread structure of the built-in connecting rod has a pitch of 1.5 mm.

[0017] The beneficial effects of the utility model are as follows: when the milling cutter module is installed, the milling cutter block is inserted into the hollow hole in cooperation with the built-in connecting rod, the second external thread structure is matched with the second internal thread hole of the rear pull rod, at this time, the rear pull rod is rotated, the rear pull rod is matched with the first internal thread hole of the hollow hole through the first external thread structure, the milling cutter block is installed into the cutter bar body by being pulled back, and since the pitch of the first external thread structure is smaller than the pitch of the second external thread structure, the distances of walking are different through the pitch difference, the rear pull rod is twisted, the built-in connecting rod is driven to walk rearward, the milling cutter block is locked, and quick replacement of the milling cutter head can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 It is a structural schematic view of the milling cutter head.

[0019] Fig. 2 It is an exploded structural schematic view of the milling cutter head.

[0020] Fig. 3 It is a sectional structural schematic view of the milling cutter head.

[0021] The reference signs include:

[0022] 1-cutter bar body,

[0023] 11-rear pull rod, 12-hollow hole, 13-first internal thread hole, 14-connecting head,

[0024] 15-first external thread structure, 16-connecting recess, 17-second internal thread hole,

[0025] 2-milling cutter module,

[0026] 21 - built-in connecting rod, 22 - milling cutter block, 23 - second external thread structure, 24 - mounting head,

[0027] 25 - connecting column, 26 - first middle shaft hole, 27 - second middle shaft hole, 28 - third middle shaft hole. DETAILED DESCRIPTION

[0028] The utility model is described in detail below in combination with the drawings.

[0029] As Figs. 1-3 shown, the rear pull type milling cutter head comprises a cutter bar body 1 and a milling cutter module 2 matched with the cutter bar body 1, the cutter bar body 1 is formed with a hollow hole 12 with a hollow structure, one end of the hollow hole 12 is formed with a first internal thread hole 13, a rear pull rod 11 is movably installed in the hollow hole 12, the rear end of the rear pull rod 11 is formed with a first external thread structure 15 matched with the first internal thread hole 13, the front end of the rear pull rod 11 is formed with a second internal thread hole 17, the milling cutter module 2 comprises a built-in connecting rod 21 inserted into the hollow hole 12 and a milling cutter block 22 installed at the outer end of the built-in connecting rod 21, the inner end of the built-in connecting rod 21 is formed with a second external thread structure 23 matched with the second internal thread hole 17; wherein the pitch of the first external thread structure 15 is smaller than the pitch of the second external thread structure 23.

[0030] When the milling cutter module 2 is installed, the milling cutter block 22 is inserted into the hollow hole 12 in cooperation with the built-in connecting rod 21, and is matched with the second internal thread hole 17 of the rear pull rod 11 through the second external thread structure 23, at this time, the rear pull rod 11 is rotated, so that the rear pull rod 11 is matched with the first internal thread hole 13 of the hollow hole 12 through the first external thread structure 15, the milling cutter block 22 is pulled back and installed into the cutter bar body 1, and since the pitch of the first external thread structure 15 is smaller than the pitch of the second external thread structure 23, the distance walked through the difference between the pitches is not the same, the rear pull rod 11 is screwed, the built-in connecting rod 21 is driven to walk backward, the milling cutter block 22 is locked, and quick replacement of the milling cutter head can be realized.

[0031] Preferably, the pitch of the first external thread structure 15 of the rear pull rod 11 is 1mm, and the pitch of the second external thread structure 23 of the built-in connecting rod 21 is 1.5mm. When the rear pull rod 11 is screwed by 1mm, since the pitch of the built-in connecting rod 21 is 0.5mm larger than that of the rear pull rod 11, the rear pull rod 11 moves relatively, only walks 0.5mm, and the rear pull force is enlarged by 2 times at the same time.

[0032] Preferably, the rear pull rod 11 is formed with a connecting head 14 at the rear end, a first external thread structure 15 is formed on the connecting head 14, and a connecting groove 16 is further formed on the outer end of the connecting head 14. The connecting groove 16 is an internal hexagonal groove. A hexagonal head spanner can be inserted into the connecting groove 16 to drive the rear pull rod 11 to rotate, so that the rear pull rod 11 can be pulled outward to realize the installation of the milling cutter module 2, or the rear pull rod 11 can be twisted inward to realize the disassembly and replacement of the milling cutter module 2.

[0033] The milling cutter block 22 includes a mounting head 24 and a connecting column 25 formed on the mounting head 24, the connecting column 25 is connected with the built-in connecting rod 21, and the mounting head 24 is in abutting cooperation with the hollow hole 12. When the rear pull rod 11 is rotated, the milling cutter block 22 is pulled back and installed into the cutter bar body 1, and after the mounting head 24 of the milling cutter block 22 abuts against the cutter bar body 1, locking is realized.

[0034] The connecting column 25 is coaxially connected with the built-in connecting rod 21 to form a circular truncated cone structure, and after the milling cutter block 22 is pulled back and installed into the cutter bar body 1, the connecting column 25 embedded in the hollow hole 12 forms an inclined surface cooperation, which can improve the installation stability of the milling cutter block 22.

[0035] The milling cutter block 22 is axially formed with a first central axis hole 26, the built-in connecting rod 21 is axially formed with a second central axis hole 27, and the first central axis hole 26 and the second central axis hole 27 are coaxially aligned; the milling cutter block 22 and the built-in connecting rod 21 can be locked and installed to form the milling cutter module 2 by cooperating the first central axis hole 26 and the second central axis hole 27 and inserting a central axis rod.

[0036] Preferably, the rear pull rod 11 is axially formed with a third central axis hole 28, the third central axis hole 28 is coaxially aligned with the second central axis hole 27; after the milling cutter module 2 is installed with the cutter bar body 1, a central axis body can be inserted between the third central axis hole 28 and the second central axis hole 27 for locking and installation, so that the milling cutter module 2 is more stable after being connected with the rear pull rod 11.

[0037] As can be seen from the above, the utility model has the excellent characteristics described above, and has the practicability of improving the performance of the prior art, and becomes a product with high practical value.

[0038] The above content is only a preferred embodiment of the utility model, and for those skilled in the art, the specific implementation mode and application range can be changed according to the idea of the utility model, and the content of the specification should not be understood as a limitation of the utility model.

Claims

1. A pull-behind milling head comprising a shank body and a milling module cooperating with the shank body, characterized in that: The cutter bar body is formed with a hollow hole with a hollow structure, one end of the hollow hole is formed with a first internal thread hole, a rear pull rod is movably installed in the hollow hole, a first external thread structure matched with the first internal thread hole is formed at the rear end of the rear pull rod, a second internal thread hole is formed at the front end of the rear pull rod, the milling cutter module comprises an internal connecting rod inserted into the hollow hole and a milling cutter block installed at the outer end of the internal connecting rod, a second external thread structure matched with the second internal thread hole is formed at the inner end of the internal connecting rod; wherein the pitch of the first external thread structure is smaller than the pitch of the second external thread structure.

2. The back pull type cutter head according to claim 1, characterized in that: The milling cutter block comprises a mounting head and a connecting column formed on the mounting head, the connecting column is connected with the internal connecting rod, and the mounting head is matched with the hollow hole stop.

3. The back pull type cutter head according to claim 2, wherein: The connecting column and the internal connecting rod are coaxially connected to form a circular truncated cone structure.

4. The back pull type cutter head according to claim 3, wherein: The milling cutter block is axially formed with a first central hole, the internal connecting rod is axially formed with a second central hole, and the first central hole and the second central hole are coaxially aligned.

5. The back pull type cutter head according to claim 4, wherein: The rear pull rod is axially formed with a third central hole, and the third central hole is coaxially aligned with the second central hole.

6. The back pull type cutter head according to claim 5, wherein: The rear end of the rear pull rod is formed with a connecting head, the first external thread structure is formed on the connecting head, and a connecting groove is further formed at the outer end of the first connecting head.

7. The back- drawn milling cutter head according to claim 6, characterized in that: The connecting groove is an internal hexagonal groove.

8. The back pull type cutter head according to claim 7, characterized in that: The pitch of the first external thread structure of the rear pull rod is 1mm, and the pitch of the second external thread structure of the internal connecting rod is 1.5mm.

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