Internal spline core expansion type machine tool fixture
The utility model relates to a lathe positioning fixture technical field especially relates to an internal spline core expansion formula machine tool fixture.
The flange part product used on the automobile has higher requirement on the machining precision of the mounting surface. The external grinding and end turning of the internal spline type flange product shown in figure 3 are based on the internal spline as a processing and detection reference, and the requirement on form and position tolerance is high. In the prior art, a spline micro-cone mandrel is generally adopted to position and clamp an internal spline type flange workpiece, and the outer circle of the workpiece is ground. The spline micro-cone mandrel is provided with external splines which have fine taper, the internal splines of a workpiece to be processed are in sliding fit with the external splines, and the end part of the spline micro-cone mandrel is provided with a locking part to complete clamping and positioning of the workpiece to be processed. The problems that the clamping speed is low, the operation is complex, the labor intensity is high, the production efficiency is low and the like exist, and only grinding machining can be carried out on the outer circle of the spline micro-cone mandrel when the spline micro-cone mandrel is clamped, and turning machining of the end part cannot be carried out. Therefore, a positioning and clamping clamp for an internal spline type flange product, which is simple to operate and high in clamping speed, is needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an internal spline core expansion formula machine tool fixture, this anchor clamps are used for clamping internal spline type flange class product, convenient to use, swift, very big reduction intensity of labour, have effectively improved the clamping speed of machine tooling.
In order to achieve the above object, the utility model adopts the following technical scheme:
the utility model provides an internal spline core expansion formula lathe anchor clamps, is applied to the processing of internal spline type flange work piece which characterized in that includes:
the connecting disc is connected with the machine tool;
the outer surface of the expansion core shaft is provided with a frustum part, the inner part of the expansion core shaft is provided with a central hole along the axis, and the expansion core shaft is arranged on the connecting disc and is coaxial with the connecting disc;
the outer side of the expansion sleeve is provided with a spline, the inner side of the expansion sleeve is provided with a conical surface part, the conical surface part is in sliding fit with the frustum part, and the expansion sleeve is sleeved on the expansion core shaft;
the pressing rod is of a T-shaped structure, the rod part of the pressing rod downwards penetrates through the central hole of the expanding mandrel, and the cap end of the pressing rod is positioned outside the upper end sides of the expanding mandrel and the expanding sleeve; and
and the connecting pull rod penetrates through the connecting disc to be connected with the end of the pressing rod and is used for pulling the pressing rod to expand and press the expansion sleeve.
Furthermore, the expansion core shaft further comprises an end positioning disc, and the end positioning disc is sleeved at the lower end part of the expansion core shaft and is coaxially connected with the connecting disc.
Furthermore, the upper end part of the expansion core shaft is provided with a limiting groove, the end part of the compression rod cap is provided with a limiting boss, and the limiting boss is matched with the limiting groove.
Further, anchor clamps still include holding screw, holding screw transversely wears to locate rise mandrel lower extreme, top tight compression bar. The structure of the clamp is more stable.
Furthermore, the compression rod is in threaded connection with the connection pull rod. The clamp is convenient to mount and dismount, and particularly the expansion sleeve is convenient to replace.
Furthermore, the connecting disc and the end positioning disc and the connecting disc and the expansion core shaft are both in bolt connection.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the clamp of the utility model is provided with a connecting disc, an expansion mandrel, an expansion sleeve, a pressing rod and a connecting pull rod; the expanding mandrel is provided with a conical table part, the expanding sleeve is provided with a matched conical surface part, and the connecting pull rod pulls the pressing rod to enable the expanding sleeve to slide and expand along the expanding mandrel so as to position and clamp a workpiece to be processed which is sleeved outside the expanding sleeve. The utility model has the advantages of simple structure, convenient operation is swift, both can carry out the abrasive machining of work piece excircle behind the clamping, can carry out the lathe work of tip again, has effectively improved production efficiency.
2. The utility model discloses in be equipped with the end positioning disk, treat during the clamping and process the work piece terminal surface and fix a position, can effectively promote the precision of clamping and processing, guarantee to process the quality of work piece.
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic structural diagram of a portion a in fig. 1 according to the present invention.
Fig. 3 is a schematic view of the workpiece to be processed according to the present invention.
1: a connecting disc; 2: expanding the mandrel; 21: a limiting groove; 3: expanding sleeves; 4: a hold down bar; 41: a limiting boss; 5: connecting a pull rod; 6: an end positioning plate; 7: and (5) tightening the screw.
In the description of the present invention, it should be understood that the terms "upper", "lower", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that the product of the present invention is usually placed when in use, or the orientation or positional relationship that a person skilled in the art usually understands, only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.
As shown in fig. 1, the utility model provides an internal spline core expansion type machine tool clamp (hereinafter referred to as clamp for short), this anchor clamps include connection pad 1, end positioning disk 6, core shaft 2 that rises, the cover 3 that rises, compress tightly pole 4 and connecting rod 5.
The fixture is applied to the processing of an internal spline type flange workpiece, and the internal spline type flange workpiece to be processed of the embodiment is shown in fig. 3.
The connecting disc 1 is of a disc-shaped structure, a through hole is formed in the center of the connecting disc 1, and the connecting disc 1 is installed on a machine tool and fixedly connected with a workbench on the machine tool.
The upper part of the outer surface of the expanding mandrel 2 is provided with a cone table part, the inner part of the expanding mandrel 2 is provided with a central hole along the axis, and the central hole vertically penetrates through the expanding mandrel 2. The lower end of the expansion core shaft 2 is installed on the connecting disc 1 through a bolt, and the expansion core shaft 2 and the connecting disc 1 are coaxially arranged. The central hole of the expanding mandrel 2 is communicated with the through hole on the connecting disc 1; the end of the expansion mandrel 2 with the smaller diameter of the frustum part is positioned at the upper end, and the end with the larger diameter is close to the lower end.
The expansion sleeve 3 is provided with splines on the outer side, namely the external splines. And during clamping, the external spline is matched with the internal spline of the workpiece to be processed. The inner side of the expansion sleeve 3 is provided with a conical surface part, and the conical surface part is in sliding fit with a frustum part on the outer surface of the expansion core shaft 2. During clamping, the expansion sleeve 3 is sleeved on the expansion core shaft 2.
And the pressing rod 4 is of a T-shaped structure and comprises a cylindrical rod part and a disc-shaped cap end part. The rod part of the expansion sleeve penetrates through the central hole of the expansion core shaft 2 downwards, and the cap end of the expansion sleeve is arranged outside the upper end of the expansion core shaft 2 and the upper end of the expansion sleeve 2.
And one end of the connecting pull rod 5 penetrates through the connecting disc 1 to be connected with the rod end of the pressing rod 4, the other end of the connecting pull rod is connected with a hydraulic tank in the machine tool, and the connecting pull rod 5 and the pressing rod 4 are located on the same axis. The hydraulic tank can drive the connecting pull rod 5 to slide and is used for tensioning the pressing rod 4, so that the cap end of the pressing rod 4 downwards presses the expansion sleeve 3, and the expansion sleeve 3 and the expansion core shaft 2 slide mutually to expand and press. The connecting pull rod 5 and the pressing rod 4 are connected in a threaded manner, so that the connecting device is convenient to detach and install, stable in connecting structure and capable of achieving the pressing function of the pressing rod 4.
Further, the clamp of the present embodiment is further provided with an end positioning disc 6, wherein the end positioning disc 6 is of an annular structure, is sleeved on the lower end portion of the expanding mandrel 2, and is tangent to the lower end portion of the expanding mandrel 2; the end positioning plate 6 is fixedly connected with the connecting plate 1 through a bolt; the connecting disc 1, the end positioning disc 6 and the expansion core shaft 2 are coaxially arranged.
Further, the upper end of the expanding mandrel 2 of the embodiment is provided with a circular limiting groove 21, the lower side of the cap end of the pressing rod 4 is provided with a limiting boss 41, the limiting boss 41 is matched with the limiting groove 21, and when the pressing rod 4 is pulled, the limiting boss 41 is located in the limiting groove 21 and slides along the limiting groove 21. The limiting boss 41 and the limiting groove 21 mainly play a role in guiding and limiting.
Further, the anchor clamps of this embodiment still are equipped with holding screw 7, holding screw 7 is equipped with the external screw thread, 2 lower extremes of dabber that rises are equipped with a horizontal internal thread hole that matches, and holding screw 7 wears to locate in the internal thread hole to stretch into the centre bore of dabber 2 that rises, contact with compression bar 4. The set screw 7 is perpendicular to the pressing rod 4 and pushes the pressing rod 4 from the side. Furthermore, the side surface of the rod part of the pressing rod 4 is provided with a strip-shaped groove for the end part of the set screw 7 to extend into. Set screw 7 prevents that compression bar 4 from rocking and the dabber 2 that rises relatively rotate, makes the structure of anchor clamps more stable firm.
The clamp of the embodiment has a plurality of expansion sleeves 3 which are a whole sleeve, and the thickness, the spline and other dimensions of the expansion sleeves are different, so that the clamp is suitable for workpieces to be processed with various dimensions. The expansion sleeve 3 can be replaced and used according to different machined workpieces, and the application range is wide.
When the fixture works, the fixture is arranged on a machine tool, the connecting pull rod 6 of the fixture is connected with a hydraulic tank in the machine tool, the connecting disc 1 is fixed on a workbench of the machine tool, and a driving device is arranged in the workbench. During clamping, a workpiece to be machined is sleeved on the expansion sleeve 3, the end face of the workpiece is positioned through the end positioning disc 6, the hydraulic box is started to pull the connecting pull rod 5, the pressing rod 4 is tensioned, the expansion sleeve 3 is expanded to clamp the workpiece to be machined, and finally, the driving device is started to enable the whole clamp and the clamped workpiece to be machined to rotate for grinding or turning.