Cam profile grinding tool

Abstract

The utility model discloses a cam contour grinding tool and relates to the technical field of part machining, the cam contour grinding tool comprises a mounting seat, a mandrel part, a positioning part and a locking assembly, during cam machining, after the mandrel part and the mounting seat are fixed, the mounting seat is positioned and fixed to a machine tool, and a cam needing to be machined is fixed to the mandrel part through the locking assembly; the coaxiality deviation of the inner hole of the cam and the core shaft piece is ensured through the locking assembly, and the machining precision of the outer contour of the cam can be guaranteed; the positioning piece is matched with the positioning hole of the cam, rotation of the cam relative to the mandrel piece can be effectively limited, in the long-time grinding or turning loss process, even if slight looseness occurs between the mandrel piece and the cam, it can be guaranteed that the cam cannot rotate relative to the mandrel through the positioning piece, and the machining precision is improved. And the machining size of the outer contour of the cam meets the design requirement.

Description

Technical Field

[0001] This application relates to the technical field of component processing, and particularly to a cam profile grinding tooling fixture. Background Art

[0002] In the field of machining, the machining of cams requires ensuring the coaxiality of the inner hole and the mandrel to ensure the accurate machining of the outer contour. Although the existing clamping fixtures can ensure the coaxiality of the inner hole and the mandrel, during long-term grinding or turning wear, even if the clamping between the mandrel and the inner hole is tightened, looseness will still occur between the mandrel and the cam. Although the axial displacement of the cam is restricted, the looseness will still cause the cam to rotate relative to the mandrel, resulting in the outer contour size of the machined cam not meeting the design requirements. Utility Model Content

[0003] This application aims to solve at least one of the above technical problems in the prior art to some extent. For this reason, the embodiments of this application provide a cam profile grinding tooling fixture, which can effectively clamp the cam, ensure that the coaxiality of the inner hole of the cam and the mandrel remains unchanged during the machining process, and avoid the rotation of the cam relative to the mandrel during the machining process, thereby ensuring the machining accuracy of the outer contour of the cam.

[0004] According to the cam profile grinding tooling fixture provided by the embodiments of this application, it includes a mounting base for connecting to a machine tool; a mandrel member detachably connected to the mounting base; a positioning member fixed to the mounting base, the positioning member cooperating with the positioning hole of the cam to limit the rotation of the cam relative to the mandrel member; and a locking assembly for fixing the cam to the mandrel member.

[0005] According to the cam profile grinding tooling fixture described in the embodiments of this application, the locking assembly includes a first adjusting member and a second adjusting member. The first adjusting member is sleeved on the mandrel member, and the second adjusting member cooperates with the mandrel member so that the first adjusting member can fix the cam sleeved outside the first adjusting member to the mandrel member.

[0006] According to the cam profile grinding tooling fixture described in the embodiments of this application, the mandrel member has an adjusting portion, and the second adjusting member cooperates with the mandrel member to adjust the distance between the first adjusting member and the mounting base. During the process of the first adjusting member approaching the mounting base, under the action of the adjusting portion, the diameter of the end of the first adjusting member away from the mounting base gradually increases.

[0007] According to the cam profile grinding tooling fixture described in the embodiments of this application, the diameter of the end of the adjusting portion close to the mounting base is larger than the diameter of the other end of the adjusting portion, and the first adjusting member has a tapered surface cooperating with the adjusting portion.

[0008] For the cam profile grinding tooling according to the embodiments of the present application, a plurality of expansion grooves are circumferentially arranged on the outer surface of the first adjusting member, and the expansion grooves penetrate through the conical surface.

[0009] For the cam profile grinding tooling according to the embodiments of the present application, a first connecting portion is provided at one end of the mandrel member away from the mounting seat, and the second adjusting member is threadedly connected to the first connecting portion so that the second adjusting member can be adjusted along the axial direction of the mandrel member.

[0010] For the cam profile grinding tooling according to the embodiments of the present application, a third adjusting member and a fourth adjusting member are arranged between the mounting seat and the first adjusting member. The surfaces of the third adjusting member and the fourth adjusting member that are in contact with each other are inclined surfaces that are inclined towards the fourth adjusting member. The third adjusting member is threadedly connected to the mandrel member, and the third adjusting member can approach or move away from the mandrel member along the radial direction of the mandrel member. The fourth adjusting member is sleeved on the mandrel member.

[0011] For the cam profile grinding tooling according to the embodiments of the present application, after the end of the mandrel member penetrates through the mounting seat, the mandrel member is fixed to the mounting seat by a first fastening member.

[0012] For the cam profile grinding tooling according to the embodiments of the present application, the end of the mandrel member that penetrates through the mounting seat has a second connecting portion, and the first fastening member is threadedly connected to the second connecting portion.

[0013] For the cam profile grinding tooling according to the embodiments of the present application, the mounting seat is provided with a second fastening member that can be adjusted along the radial direction of the mounting seat, and the second fastening member is used to limit the rotation of the mandrel member relative to the mounting seat.

[0014] The above-mentioned cam profile grinding tooling has at least the following beneficial effects: When machining a cam, after fixing the mandrel member and the mounting seat, the mounting seat is positioned and fixed on the machine tool, and the cam to be machined is fixed on the mandrel member through the locking assembly. The coaxiality deviation between the inner hole of the cam and the mandrel member is ensured through the locking assembly, which is beneficial to ensuring the machining accuracy of the outer contour of the cam; and by matching the positioning member with the positioning hole of the cam, the rotation of the cam relative to the mandrel member can be effectively restricted. During long-term grinding or turning wear, even if there is a slight looseness between the mandrel member and the cam, the setting of the positioning member can ensure that the cam does not rotate relative to the mandrel, ensuring that the machining size of the outer contour of the cam meets the design requirements. Description of the Drawings

[0015] The present application will be further described below with reference to the drawings and embodiments;

[0016] Figure 1It is a schematic structural diagram of the cam according to an embodiment of the present application;

[0017] Figure 2 is Figure 1 a sectional view taken along the A-A direction in

[0018] Figure 3 It is a schematic structural diagram of the cam fixed to the cam profile grinding tooling in an embodiment of the present application;

[0019] Figure 4 is Figure 3 a schematic view taken along the B direction in

[0020] Figure 5 is Figure 4 a sectional view taken along the C-C direction in

[0021] Figure 6 It is a schematic structural diagram of the cam profile grinding tooling in an embodiment of the present application Figure 1 ;

[0022] Figure 7 It is a schematic structural diagram of the cam profile grinding tooling in an embodiment of the present application Figure 2 ;

[0023] Figure 8 It is a schematic structural diagram of the mounting seat in an embodiment of the present application;

[0024] Figure 9 is Figure 8 a sectional view taken along the D-D direction in

[0025] Figure 10 It is a schematic structural diagram of the mandrel part in an embodiment of the present application

[0026] Figure 11 It is a schematic structural diagram of the first adjusting part in an embodiment of the present application;

[0027] Figure 12 is a sectional view taken along the E-E direction in 11;

[0028] Figure 13 It is a schematic structural diagram of the positioning seat in an embodiment of the present application;

[0029] Figure 14 is Figure 13 a sectional view taken along the F-F direction in

[0030] Reference signs: cam 100, inner hole 110, positioning hole 120; mounting seat 210, through hole 211, adjusting screw hole 212, U-shaped locking groove 213, receiving groove 214, mandrel member 220, body portion 221, through portion 222, second connecting portion 223, adjusting portion 224, first connecting portion 225, limiting hole 226, first adjusting member 230, expansion groove 231, tapered surface 232, first fastener 240, gasket 251, second adjusting member 252; adjusting rod 310, third adjusting member 320, fourth adjusting member 330; positioning seat 410, positioning member 420. Detailed implementation manners

[0031] This section will describe in detail the specific embodiments of the present application. The preferred embodiments of the present application are shown in the drawings. The function of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present application, but it should not be construed as a limitation on the protection scope of the present application.

[0032] In the description of the present application, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present application.

[0033] In the description of the present application, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the number itself, and above, below, within, etc. are understood as including the number itself. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0034] In the description of the present application, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present application in combination with the specific content of the technical solution.

[0035] Referring to Figure 1 and Figure 2 , in the embodiments of the present application, the cam 100 generally has an irregular outer contour. The existing tooling cannot guarantee the machining accuracy of the outer contour of the cam 100. As the tooling is used for a long time, the dimensional accuracy of the outer contour of the cam 100 becomes worse and worse. For this reason, the present application provides a tooling that can effectively guarantee the machining of the outer contour of the cam 100. To adapt to the tooling of the application, a positioning hole 120 is provided on the existing cam 100.

[0036] Specifically, as Figures 3 to 7 , the cam profile grinding tooling of the embodiment of the present application includes a mounting seat 210, a mandrel member 220, a positioning member 420, and a locking assembly. Among them, the mounting seat 210 is used to connect with the main shaft of the machine tool. The mandrel member 220 is used for fixing the cam 100, and the mandrel member 220 and the mounting seat 210 are detachably connected, which is convenient for changing different mandrel members 220 according to different cams 100. The positioning member 420 is fixed to the mounting seat 210. When the cam 100 is fixed to the mandrel member 220, the positioning member 420 can cooperate with the positioning hole 120 of the cam 100 to limit the rotation of the cam 100 relative to the mandrel member 220, that is, to limit the relative rotation between the cam 100 and the mandrel member 220. The locking assembly is used to fix the cam 100 on the mandrel member 220. At the same time, the locking assembly also plays a role in precisely controlling the coaxiality between the inner hole 110 of the cam 100 and the mandrel member 220.

[0037] Specifically, when machining the cam 100, after fixing the mandrel member 220 and the mounting seat 210, the mounting seat 210 is positioned and fixed on the machine tool. The cam 100 to be machined is fixed on the mandrel member 220 through the locking assembly. The coaxiality deviation between the inner hole 110 of the cam 100 and the mandrel member 220 is ensured through the locking assembly, which is beneficial to ensuring the machining accuracy of the outer contour of the cam 100. By the cooperation of the positioning member 420 and the positioning hole 120 of the cam 100, the rotation of the cam 100 relative to the mandrel member 220 can be effectively restricted. During long-term grinding or turning loss, even if there is a slight looseness between the mandrel member 220 and the cam 100, the setting of the positioning member 420 can ensure that the cam 100 does not rotate relative to the mandrel, and ensure that the machining size of the outer contour of the cam 100 meets the design requirements.

[0038] Specifically, after the mounting seat 210 and the main shaft of the machine tool are positioned through a shaft pin, the mounting seat 210 is fixed to the main shaft of the machine tool through bolts. Among them, when the cam 100 is fixed to the mandrel member 220 through the locking assembly, the setting direction of the positioning hole 120 of the cam 100 is parallel to the central axis of the mandrel member 220. A positioning seat 410 for fixing the positioning member 420 is provided on the mounting seat 210. As Figure 4 , Figure 13 and Figure 14 shown, the positioning seat 410 is fixed to the mounting seat 210 through bolts. One end of the positioning member 420 is provided with a stud, and the other end is provided with a columnar portion. The stud is threadedly connected with the screw hole on the positioning seat 410, and the columnar portion can be inserted into the positioning hole 120 of the cam 100. By setting the positioning member 420 parallel to the mandrel member 220 to restrict the relative rotation between the cam 100 and the mandrel member 220, the machining size of the outer contour of the cam 100 can be effectively guaranteed.

[0039] In the embodiment of the present application, the locking assembly includes a first adjusting member 230 and a second adjusting member 252. The first adjusting member 230 is sleeved on the core shaft member 220, and the second adjusting member 252 cooperates with the core shaft member 220 so that the first adjusting member 230 can fix the cam 100 sleeved outside the first adjusting member 230 to the core shaft member 220. The cooperation between the second adjusting member 252 and the core shaft member 220 can cause the first adjusting member 230 to deform to fill a part of the gap between the core shaft member 220 and the inner hole 110. Under the filling adjustment of the first adjusting member 230, the inner hole 110 of the cam 100 is gradually adjusted to be concentric with the core shaft member 220, thereby effectively ensuring the coaxiality between the inner hole 110 of the cam 100 and the core shaft member 220. It should be noted that the inner hole 110 of the first adjusting member 230 is concentric with the outer surface. After the clearance fit between the first adjusting member 230 and the core shaft member 220, the first adjusting member 230 and the core shaft member 220 are concentric. When the first adjusting member 230 deforms to fit the cam 100, under the action of the core shaft member 220, the first adjusting member 230 is still concentric with the core shaft member 220.

[0040] Specifically, as Figures 2 to 10 shown, the core shaft member 220 has an adjusting portion 224. The second adjusting member 252 cooperates with the core shaft member 220 to adjust the distance between the first adjusting member 230 and the mounting seat 210. During the process of the first adjusting member 230 approaching the mounting seat 210, under the action of the adjusting portion 224, the diameter of the end of the first adjusting member 230 away from the mounting seat 210 gradually increases, so that the first adjusting member 230 can fill a part of the gap between the inner hole 110 of the cam 100 and the core shaft member 220, and the cam 100 is fixed to the core shaft member 220 by expanding and tightening the first adjusting member 230. At the same time, the second adjusting member 252 also plays a role in restricting the first adjusting member 230 from detaching from the core shaft member 220 to ensure the fixation of the cam 100.

[0041] Among them, the diameter of one end of the adjusting portion 224 close to the mounting seat 210 is larger than the diameter of the other end of the adjusting portion 224, that is, the adjusting portion 224 also has a conical surface, and the first adjusting member 230 has a conical surface 232 that cooperates with the adjusting portion 224. When it is necessary to fix the cam 100, first sleuth the cam 100 on the outer surface of the first adjusting member 230, and slowly adjust the second adjusting member 252. As the conical surface 232 of the first adjusting member 230 slowly moves to cooperate with the adjusting portion 224, as the distance between the first adjusting member 230 and the mounting seat 210 gradually decreases, since the first adjusting member 230 is annular, thus under the action of the adjusting portion 224, the end of the first adjusting member 230 away from the mounting seat 210 is slowly expanded, and then the cam 100 can be tightened on the core shaft member 220. Adopting this method to fix the cam 100 does not require additional processing of the cam 100, and it is not easy to damage the inner hole 110 of the cam 100, effectively protecting the cam 100.

[0042] Further, as Figure 11 and Figure 12 shown, a plurality of expansion grooves 231 are circumferentially arranged on the outer surface of the first adjusting member 230, and the expansion grooves 231 penetrate through the conical surface 232. Specifically, the first adjusting member 230 is annular, the inner surface of the annulus is the conical surface 232, and the diameter of at least one-fifth of the conical surface 232 is larger than the maximum diameter of the core shaft member 220, avoiding jamming and facilitating the expansion of the first adjusting member 230. Among them, the arrangement direction of the circumferentially arranged expansion grooves 231 is parallel to the axis of the core shaft member 220, the expansion grooves 231 start from one end of the first adjusting member 230, and the length of the expansion grooves 231 is not less than four-fifths of the length of the first adjusting member 230. The setting of the expansion grooves enables a part of the first adjusting member 230 to be expanded under the cooperation of the adjusting portion 224 and the conical surface 232, and then the cam 100 can be tightened on the core shaft member 220.

[0043] In the embodiment of the present application, a first connecting portion 225 is provided at one end of the spindle 220 away from the mounting seat 210, and a second adjusting member 252 is threadedly connected to the first connecting portion 225, so that the second adjusting member 252 can be adjusted along the axial direction of the spindle 220. It should be noted that when the cam 100 is fixed to the spindle 220 by the first adjusting member 230, the second adjusting member 252 abuts against the first adjusting member 230. Specifically, the first connecting portion 225 extends along the axial direction of the spindle 220, and the outer surface of the first connecting portion 225 is provided with an external thread, and the second adjusting member 252 is provided with an internal thread that cooperates with the external thread. Through the cooperation of the internal and external threads, the second adjusting member 252 can be rotated to adjust the second adjusting member 252 along the axial direction of the spindle 220, thereby allowing the second adjusting member 252 to push against the cooperation between the first adjusting member 230 and the adjusting portion 224, thereby partially expanding the first adjusting member 230. In order to increase the contact area between the second adjusting member 252 and the first adjusting member 230 , a gasket 251 is provided between the second adjusting member 252 and the first adjusting member 230 .

[0044] In some embodiments, as Figures 3 to 6 As shown, a third adjusting member 320 and a fourth adjusting member 330 are provided between the mounting seat 210 and the first adjusting member 230. The surfaces where the third adjusting member 320 and the fourth adjusting member 330 meet are inclined surfaces inclined toward the fourth adjusting member 330. The third adjusting member 320 is connected to the core shaft 220 via a threaded connection and can move closer to or farther from the core shaft 220 along the radial direction of the core shaft 220. The fourth adjusting member 330 is sleeved on the core shaft 220. When the cam 100 is fixed, one end of the first adjusting member 230 is abutted against the second adjusting member 252, and the other end of the first adjusting member 230 abuts against the fourth adjusting member 330. The third adjusting member 320 limits the radial displacement of the fourth adjusting member 330. That is, the third adjusting member 320 and the fourth adjusting member 330 function as limit adjustment, which can also prevent the cam 100 from being over-tightened. Because the first adjusting member 230 fixes the cam 100 by an expansion method, it is easy for the first adjusting member 230 to get stuck or be difficult to remove. When this happens, the third adjusting member 320 can be driven to approach the core shaft 220 in the radial direction of the core shaft 220. Since the third adjusting member 320 and the fourth adjusting member 330 are matched through the inclined surface, that is, the inclined wedge structure, the fourth adjusting member 330 can be driven to move along the axial direction of the core shaft 220, that is, the first adjusting member 230 can be pushed away from the adjusting portion 224, thereby realizing the disassembly of the cam 100.

[0045] Specifically, the third adjusting member 320 includes two symmetrically arranged wedge blocks. The two wedge blocks are symmetrically arranged on both sides of the core shaft member 220. A regulating rod 310 is connected between the two wedge blocks. The wedge blocks are threadedly connected to the regulating rod 310. Under the limiting action of the mounting seat 210 and the fourth adjusting member 330, rotating the adjusting member can make the two wedge blocks approach or move away from each other. Specifically, in the embodiment of the present application, the regulating rod 310 can be a double-headed stud, and the core shaft member 220 has a through hole for the double-headed bolt to pass through.

[0046] In the embodiment of the present application, after the end of the core shaft member 220 penetrates through the mounting seat 210, the core shaft member 220 is fixed to the mounting seat 210 by a first fastener 240. Specifically, the end of the core shaft member 220 penetrating through the mounting seat 210 has a second connecting portion 223, and the first fastener 240 is threadedly connected to the second connecting portion 223. The core shaft member 220 penetrates through the mounting seat 210, and there is a clearance fit between the core shaft member 220 and the through hole 211 of the mounting member, which plays a positioning role. Then, through the cooperation of the first fastener 240 and the second connecting portion 223, the core shaft member 220 is fixed to the mounting seat 210. Specifically, as Figure 10 shown, the core shaft member 220 includes a main body portion 221. An adjusting portion 224 is provided at one end of the main body portion 221, and a through portion 222 is provided at the other end of the main body portion 221. A step is formed at the junction of the through portion 222 and the main body portion 221. After the through portion 222 is located in the through hole 211, the step abuts against the mounting seat 210, and the outer surface of the second connecting portion 223 provided at the end of the through portion 222 is provided with a thread. The first fastener 240 is also provided with a thread, and the first fastener 240 is threadedly connected to the second connecting portion 223. With the limitation of the step, the core shaft member 220 is fixed to the mounting seat 210. In the embodiment of the present application, the first fastener 240 is a nut.

[0047] As Figure 8 and Figure 9 shown, the mounting seat 210 has a connecting flange, and U-shaped locking grooves 213 are circumferentially arranged on the edge of the connecting flange. After the bolt passes through the U-shaped locking grooves 213, it is threadedly connected to the main shaft of the machine tool to fix the mounting seat 210 to the main shaft.

[0048] As Figure 9 shown, a receiving groove 214 is provided on the surface of the mounting seat 210 connected to the machine tool. After the core shaft member 220 is fixed to the mounting seat 210, the second connecting portion 223 is located in the receiving groove 214.

[0049] In some embodiments, the mounting base 210 is provided with a second fastener that can be adjusted in the radial direction of the mounting base 210, and the second fastener is used to restrict the rotation of the mandrel member 220 relative to the mounting base 210. Specifically, the mounting base 210 includes an adjustment screw hole 212, the central axis of the adjustment screw hole 212 intersects the central axis of the through hole 211, and the adjustment screw hole 212 extends to communicate with the through hole 211. The second fastener is threadedly connected to the adjustment screw hole 212, and a limiting hole 226 for inserting the second fastener is provided in the through portion 222 of the mandrel member 220. In the embodiments of the present application, the second fastener may be a machine screw or a bolt.

[0050] The embodiments of the present application have been described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the above embodiments. Various changes can be made without departing from the spirit of the present application within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A cam profile grinding tooling, characterized in that: including a mounting base for connecting to a machine tool; a mandrel member detachably connected to the mounting base; a positioning member fixed to the mounting base, the positioning member being engaged with a positioning hole of a cam to define rotation of the cam relative to the mandrel member; and a locking assembly for fixing the cam to the mandrel member.

2. The cam profile grinding tooling according to claim 1, characterized in that: The locking assembly includes a first adjusting member and a second adjusting member. The first adjusting member is sleeved on the mandrel member, and the second adjusting member is engaged with the mandrel member so that the first adjusting member can fix the cam sleeved outside the first adjusting member to the mandrel member.

3. The cam profile grinding tooling according to claim 2, wherein: The mandrel member has an adjusting portion, and the second adjusting member is engaged with the mandrel member to adjust the distance of the first adjusting member from the mounting base. During the process of the first adjusting member approaching the mounting base, under the action of the adjusting portion, the diameter of the end of the first adjusting member away from the mounting base gradually increases.

4. The cam profile grinding tooling according to claim 3, wherein: The diameter of the end of the adjusting portion close to the mounting base is larger than the diameter of the other end of the adjusting portion, and the first adjusting member has a tapered surface engaged with the adjusting portion.

5. The cam profile grinding tooling according to claim 4, wherein: A plurality of expansion grooves are circumferentially provided on the outer surface of the first adjusting member, and the expansion grooves penetrate through the tapered surface.

6. The cam profile grinding tooling according to claim 3, characterized in that: A first connecting portion is provided at one end of the mandrel member away from the mounting base, and the second adjusting member is threadedly connected to the first connecting portion so that the second adjusting member can be adjusted in the axial direction of the mandrel member.

7. The cam profile grinding tooling according to claim 2, wherein: A third adjusting member and a fourth adjusting member are provided between the mounting base and the first adjusting member. The surface of the third adjusting member in contact with the fourth adjusting member is an inclined surface inclined towards the fourth adjusting member. The third adjusting member is threadedly connected to the mandrel member, and the third adjusting member can approach or move away from the mandrel member in the radial direction of the mandrel member. The fourth adjusting member is sleeved on the mandrel member.

8. The cam profile grinding tooling according to claim 1, characterized in that: After the end of the mandrel member penetrates through the mounting base, the mandrel member is fixed to the mounting base by a first fastener.

9. The cam profile grinding tooling according to claim 8, wherein: The end of the mandrel member penetrating through the mounting base has a second connecting portion, and the first fastener is threadedly connected to the second connecting portion.

10. The cam profile grinding tooling according to claim 8, characterized in that: The mounting base is provided with a second fastener capable of being adjusted in the radial direction of the mounting base, and the second fastener is used to limit the rotation of the mandrel member relative to the mounting base.

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