Stretching device of broach with large length-diameter ratio

Abstract

The utility model relates to the technical field of broach stretching, in particular to a stretching device for a broach with a large length-diameter ratio, which comprises a support cylinder, two bearings and two locking pieces, the support cylinder is used for mounting the broach and is provided with a grinding groove, the two bearings are respectively positioned at two ends of the support cylinder, the broach penetrates through the bearings and is rotatably connected with the bearings, and the two locking pieces are arranged on the support cylinder. The locking piece is located at one end of the bearing away from the supporting cylinder. When the broaching tool is ground, the broaching tool is locked in the axial direction of the broaching tool through the locking piece, compared with an existing double-top clamping mode, the rigidity of the broaching tool with the large length-diameter ratio can be improved through tensile force exerted in the axial direction in the mode that the broaching tool is pulled to be rotationally connected with the bearing, and meanwhile the rigidity of the broaching tool with the large length-diameter ratio is improved through the rotating connection mode. By means of the technical scheme, the supporting cylinder cannot rotate, the broach rotates along with grinding, it is ensured that sliding friction cannot occur between the supporting cylinder and the broach, and therefore the grinding operation precision of the broach with the large length-diameter ratio can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to broach stretching technical field especially relates to a kind of stretching device of large length-diameter ratio broach. BACKGROUND

[0002] Broach refers to: for broaching the forming tool, its surface has multiple rows of teeth, and the size and shape of each row of teeth are sequentially increased and changed from cutting-in end to cutting-out end. The length-diameter ratio of broach is large (generally greater than 50), and the rigidity of broach is poor, while the product precision cylindricity error requirement is below 0.01mm, and the current manufacturing process is difficult to guarantee, the processing efficiency is lower, and the processing cost is higher. In addition, the technical requirements for operators are high, human influence is large, and the product lacks quality stability.

[0003] At present, the outer circle of broach is ground by double-top clamping mode, according to the length-diameter ratio of broach, a plurality of fulcrums are ground in the broach chip groove first, and then the top rod of the outer circle grinding center frame is supported on the outer circle of the broach chip groove fulcrum, the center frame top rod and the broach fulcrum outer circle are sliding friction, the friction is large, which will cause the torque of each part of the broach outer circle, and cause the coaxiality of each part of the broach outer circle to be out of tolerance, thereby affecting the grinding operation precision of the broach. UTILITY MODEL CONTENT

[0004] The technical problem to be solved by the utility model is: in order to solve the technical problem that the existing double-top clamping mode affects the grinding operation precision of large length-diameter ratio broach, the utility model provides a stretching device for large length-diameter ratio broach, which can improve the rigidity of large length-diameter ratio broach and improve the grinding operation precision of large length-diameter ratio broach by improving the stretching mode of large length-diameter ratio broach.

[0005] The utility model adopts the technical scheme that: a stretching device for large length-diameter ratio broach, comprising: a support cylinder, two bearings and two locking pieces, the support cylinder is used for installing broach, and the support cylinder is provided with a grinding groove, two bearings are located at both ends of the support cylinder, the broach penetrates the bearings and is rotatably connected with the bearings, and the locking piece is located at one end of the bearing away from the support cylinder;Wherein: when the locking piece is in the locking state, the support cylinder and the locking piece can exert tension on the broach;When the locking piece is in the loosening state, the support cylinder and the locking piece do not exert tension on the broach.

[0006] Therefore, when the broach is ground, the broach is locked from the axial direction by the locking piece, and the broach is pulled in a rotating connection mode with the bearing, compared with the existing double-top clamping mode, the rigidity of the large-length-diameter-ratio broach can be improved by the axial direction applied pulling force, at the same time, the rotating connection mode can prevent the supporting barrel from rotating, and the broach rotates with the grinding, so as to prevent the sliding friction between the supporting barrel and the broach, thus, the fulcrum outer circle does not need to be pre-ground, and the outer circle can be directly ground, so as to improve the grinding operation precision of the large-length-diameter-ratio broach.

[0007] Further, it further comprises two connecting blocks, the broach penetrates the connecting blocks, the bearing is sleeved on the connecting blocks and is in rotating connection with the connecting blocks, and the locking piece is sleeved on the connecting blocks and is in threaded connection with the connecting blocks.

[0008] Further, the connecting block comprises a mounting portion, a first connecting portion and a second connecting portion, the mounting portion is connected with the first connecting portion, and the second connecting portion is mounted on the first connecting portion.

[0009] Further, the mounting portion comprises two mounting blocks, the mounting blocks are connected with the first connecting portion, arc-shaped grooves are formed in the center positions of the mounting blocks, and locking holes are formed in the mounting blocks and are provided with bolts. Therefore, the arc-shaped grooves of the two mounting blocks can form a space for mounting the broach, and the mounting and dismounting between the mounting portion and the broach can be realized by adjusting the tightness of the bolts. When the broach needs to be ground, the broach is mounted on the mounting portion by tightening the bolts, and when the broach is ground, the broach is dismounted from the mounting portion by loosening the bolts.

[0010] Further, the first connecting portion is provided with a through hole, the broach penetrates the through hole and is connected with the first connecting portion, the bearing is sleeved on the first connecting portion and is located between the mounting portion and the second connecting portion, and the locking piece is in threaded connection with the second connecting portion. Therefore, the through hole is used for mounting the broach, the mounting and dismounting between the connecting block and the supporting barrel can be realized by the threaded connection mode, and the mounting and dismounting between the broach and the connecting block can be realized.

[0011] Further, it further comprises two end sleeves, the supporting barrel and the bearing are inserted into the end sleeves.

[0012] Further, the end sleeve is provided with a baffle inside, and one end of the supporting barrel and the bearing abuts against the baffle.

[0013] Further, the diameter of the connecting block is d1, and the inner diameter of the bearing 3 is d2; wherein: d2>d1. Thus, by the design of d2>d1, when the locking member is in the loosened state, the broach and the connecting block can freely move in the supporting cylinder, and the supporting cylinder does not interfere with the movement of the broach.

[0014] Further, the bearing is provided with a bearing cover at the end away from the supporting cylinder, the bearing cover is embedded with an arc-shaped pad, and the bearing cover and the arc-shaped pad both penetrate the first connecting part; wherein: when the locking member is in the locked state, the locking member abuts against the arc-shaped pad. Thus, since the arc-shaped pad is a convex spherical surface and the bearing cover is a concave spherical surface, the convex spherical surface and the concave spherical surface can be in rotational contact, and when the broach is subjected to external tension, the radial component force generated by the external broach can be offset, so that the broach only bears axial tension.

[0015] Compared with the prior art, the utility model has the advantages that:

[0016] When the broach is ground, the broach is locked from the axial direction of the broach by the locking member, and the broach is pulled in the manner of rotational connection with the bearing. Compared with the existing double-top clamping mode, the rigidity of the broach with a large length-diameter ratio can be improved by the axial tension, and at the same time, the supporting cylinder does not rotate in the manner of rotational connection, and the broach rotates with the grinding, so that the sliding friction between the supporting cylinder and the broach is avoided, and thus the pivot outer circle does not need to be ground in advance, and the outer circle can be directly ground, so that the grinding precision of the broach with a large length-diameter ratio is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] The utility model will be further described below in combination with the drawings and embodiments.

[0018] Figure 1 It is a structure schematic view of the stretching device of the broach with a large length-diameter ratio of the utility model;

[0019] Figure 2 It is an explosion view of the stretching device of the broach with a large length-diameter ratio of the utility model;

[0020] Figure 3 It is a structure schematic view of the connecting block from the first perspective of the utility model;

[0021] Figure 4 It is a structure schematic view of the connecting block from the second perspective of the utility model;

[0022] Figure 5 It is a structure schematic view of the end sleeve of the utility model;

[0023] Figure 6 It is a structure schematic view of the broach installed into the stretching device of the broach with a large length-diameter ratio of the utility model;

[0024] Figure 7 The exploded view of the broach of the present application installed into the stretching device of the broach with large length-diameter ratio.

[0025] In the figure: 1, support cylinder; 101, grinding groove; 2, broach; 3, bearing; 301, bearing cover; 4, locking piece; 5, connecting block; 501, mounting part; 5011, mounting block; 5012, arc-shaped groove; 5013, locking hole; 502, first connecting part; 5021, through hole; 503, second connecting part; 6, end sleeve; 601, baffle; 7, arc-shaped pad. DETAILED DESCRIPTION

[0026] The utility model will be explained in further detail in combination with the drawings. These drawings are all simplified schematic diagrams, and only schematically show the basic structure of the utility model, so they only show the structure related to the utility model.

[0027] In the description of the utility model, it is to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model. In addition, the features limited as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0028] In the description of the utility model, it is to be noted that, unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0029] As Figures 1 to 7The utility model discloses a long-diameter ratio broach 2's stretching device, including: support cylinder 1, two bearings 3 and two locking pieces 4, support cylinder 1 is used to install broach 2, and support cylinder 1 is set up with grinding groove 101, two bearings 3 are located at the both ends of support cylinder 1 respectively, and broach 2 penetrates bearing 3, and is connected with bearing 3 rotation, and locking piece 4 is located at the end of bearing 3 away from support cylinder 1, when locking piece 4 is in locking state, support cylinder 1, locking piece 4 can exert the tension of broach 2, when locking piece 4 is in the state of loosening, support cylinder 1, locking piece 4 do not exert the tension of broach 2, by this, when grinding broach 2, locking piece 4 locks broach 2 from the axial direction of broach 2, and the mode of rotation is connected with bearing 3, compared with the existing double top clamping mode, the rigidity of long-diameter ratio broach 2 can be improved by the tension of axial direction, and simultaneously, the mode of rotation is connected, can make support cylinder 1 not rotate, and broach 2 rotates along with the grinding, ensure that support cylinder 1 and broach 2 do not slide friction, so, do not need to grind fulcrum outer circle in advance, directly grind outer circle, can improve the grinding operation precision of long-diameter ratio broach 2.

[0030] Specifically, the grinding groove 101 is set up, so that the grinding device can contact with the broach 2 in the support cylinder 1, so as to grind the broach 2 by the grinding device.

[0031] For example, the locking piece 4 adopts a nut.

[0032] In the embodiment, the two connecting blocks 5 are further included, the drawbar 2 penetrates the connecting blocks 5, the bearing 3 is sleeved on the connecting blocks 5 and is rotationally connected with the connecting blocks 5, and the locking piece 4 is sleeved on the connecting blocks 5 and is threadedly connected with the connecting blocks 5. The connecting block 5 comprises a mounting portion 501, a first connecting portion 502 and a second connecting portion 503. The mounting portion 501 is connected with the first connecting portion 502, and the second connecting portion 503 is mounted on the first connecting portion 502. The mounting portion 501 comprises two mounting blocks 5011. The mounting blocks 5011 are connected with the first connecting portion 502. An arc-shaped groove 5012 is formed at the center of the mounting block 5011. The mounting block 5011 is further provided with a locking hole 5013. A bolt (not shown in the figure) is installed in the locking hole 5013. The first connecting portion 502 is provided with a through hole 5021. The drawbar 2 penetrates the through hole 5021 and is connected with the first connecting portion 502. The bearing 3 is sleeved on the first connecting portion 502. The bearing 3 is located between the mounting portion 501 and the second connecting portion 503. The locking piece 4 is threadedly connected with the second connecting portion 503. Thus, the arc-shaped grooves 5012 of the two mounting blocks 5011 can form a space for avoiding the installation of the drawbar 2. The installation and dismounting between the mounting portion 501 and the drawbar 2 can be realized by adjusting the tightness of the bolt. When the drawbar 2 needs to be ground, the drawbar 2 is installed on the mounting portion 501 by tightening the bolt. When the drawbar 2 is ground, the drawbar 2 is dismounted from the mounting portion 501 by loosening the bolt. The through hole 5021 is used for the installation of the drawbar 2. The installation and dismounting between the connecting block 5 and the supporting cylinder 1 can be realized by the threaded connection, and the installation and dismounting between the drawbar 2 and the connecting block 5 can be realized.

[0033] In the embodiment, the two end sleeves 6 are further included. The supporting cylinder 1 and the bearing 3 are inserted into the end sleeves 6. The inner part of the end sleeve 6 is provided with a baffle 601. One end of the supporting cylinder 1 and the bearing 3 abuts against the baffle 601.

[0034] In the embodiment, the diameter of the connecting block 5 is d1, and the inner diameter of the bearing 3 is d2. d2>d1. Thus, when the locking piece 4 is in the loosened state, the drawbar 2 and the connecting block 5 can freely move in the supporting cylinder 1, and the supporting cylinder 1 will not interfere with the movement of the drawbar 2.

[0035] In the embodiment, the end of the bearing 3 away from the supporting cylinder 1 is provided with a bearing cover 301. The arc-shaped pad 7 is embedded in the bearing cover 301. The bearing cover 301 and the arc-shaped pad 7 penetrate the first connecting portion 502. When the locking piece 4 is in the locked state, the locking piece 4 abuts against the arc-shaped pad 7. Thus, since the arc-shaped pad 7 is a convex spherical surface, and the bearing cover 301 is a concave spherical surface, the convex spherical surface and the concave spherical surface can be in rotational contact. When the drawbar 2 is subjected to external tension, the radial component force generated by the external drawbar 2 can be offset, so that the drawbar 2 only bears axial tension.

[0036] The mounting process of the drawbench 2 is as follows: firstly, the drawbench 2 is inserted into the connecting block 5, and the drawbench 2 is fixed on the connecting block 5 through the bolt; then, the drawbench 2 with the connecting block 5 is inserted into the supporting cylinder 1; finally, the end sleeve 6, the bearing 3, the bearing cover 301 and the arc-shaped pad 7 are sequentially mounted, and the locking piece 4 is tightened, so that the drawbench 2, the connecting block 5 and the supporting cylinder 1 are kept stable and cannot slide relatively (that is, the drawbench 2 cannot move along the axial direction, but can only rotate in the circumferential direction through the bearing 3), so as to grind the drawbench 2 through the grinding device.

[0037] In summary, when the drawbench 2 is ground, the locking piece 4 locks the drawbench 2 from the axial direction of the drawbench 2, and the bearing 3 is connected in a rotating manner, compared with the existing double top clamping mode, the rigidity of the drawbench 2 with a large length-diameter ratio can be improved by the axial direction applied tension, at the same time, the rotating connection mode can prevent the supporting cylinder 1 from rotating and the drawbench 2 from rotating during grinding, so as to ensure that the supporting cylinder 1 and the drawbench 2 cannot slide and rub, thus, the fulcrum outer circle does not need to be ground in advance, and the outer circle can be directly ground, so as to improve the grinding precision of the drawbench 2 with a large length-diameter ratio.

[0038] According to the ideal embodiment of the utility model, the above description can be varied and modified without deviating from the technical idea of the utility model. The technical scope of the utility model is not limited to the content of the specification, and must be determined by the scope of the claims.

Claims

1. A drawing apparatus for a large aspect ratio broach, comprising: The utility model provides a support cylinder (1) for installing pull broach (2), and the support cylinder (1) is provided with grinding groove (101); Two bearings (3) are respectively located at both ends of the support cylinder (1), the pull broach (2) penetrates the bearing (3), and is rotationally connected with the bearing (3); Two locking pieces (4) are located at the end of the bearing (3) away from the support cylinder (1); When the locking piece (4) is in the locking state, the support cylinder (1), the locking piece (4) can exert pulling force on the pull broach (2); When the locking piece (4) is in the loosening state, the support cylinder (1), the locking piece (4) does not exert pulling force on the pull broach (2). Further comprising:

2. The drawing apparatus of a long-ratio broach according to claim 1, wherein Two connecting blocks (5), the pull broach (2) penetrates the connecting block (5), the bearing (3) is sleeved on the connecting block (5), and is rotationally connected with the connecting block (5), the locking piece (4) is sleeved on the connecting block (5), and is threadedly connected with the connecting block (5). The connecting block (5) comprises:

3. The drawing apparatus for long-ratio broaches according to claim 2, wherein Mounting portion (501), first connecting portion (502) and second connecting portion (503), the mounting portion (501) is connected with the first connecting portion (502), and the second connecting portion (503) is mounted on the first connecting portion (502). The mounting portion (501) comprises:

4. The drawing apparatus for long-ratio broaches according to claim 3, wherein Two mounting blocks (5011) are connected with the first connecting portion (502), the center position of the mounting block (5011) is provided with an arc-shaped groove (5012), and the mounting block (5011) is also provided with a locking hole (5013), and a bolt is mounted in the locking hole (5013). The first connecting portion (502) is provided with a through hole (5021), the pull broach (2) penetrates the through hole (5021), and is connected with the first connecting portion (502); 5. The stretching apparatus for a large aspect ratio broach of claim 3, wherein The bearing (3) is sleeved on the first connecting portion (502), and the bearing (3) is located between the mounting portion (501) and the second connecting portion (503); The locking piece (4) is threadedly connected with the second connecting portion (503). Further comprising:

6. The drawing apparatus for long slenderness ratio broaches according to claim 1, characterized in that: Two end sleeves (6), the support cylinder (1) and the bearing (3) are inserted into the end sleeve (6). The inside of the end sleeve (6) is provided with a baffle (601), and one end of the support cylinder (1) and the bearing (3) abuts against the baffle (601).

7. The stretching apparatus for a large aspect ratio broach according to claim 6, wherein The diameter of the connecting block (5) is d1, and the inner diameter of the bearing (3) is d2; 8. The drawing apparatus for long-ratio broaches of claim 2 wherein, Wherein: d2>d1. The end of the bearing (3) away from the support cylinder (1) is provided with a bearing cover (301), the bearing cover (301) is inlaid with an arc-shaped pad (7), and the bearing cover (301) and the arc-shaped pad (7) penetrate the first connecting portion (502); 9. The drawing apparatus for long-ratio broaches of claim 3 wherein, When the locking piece (4) is in the locking state, the locking piece (4) abuts against the arc-shaped pad (7). ​

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