A method for machining a joint hole of a hydraulic valve body

Abstract

The present invention provides a method for processing the joint hole of a hydraulic valve body, and the steps include: firstly, processing the pin hole by processing equipment, then completing the inner hole, outer hole and chamfer of the joint hole by rough and fine forming cutters at one time, and finally rolling the inner hole by rolling cutters to improve the roughness; step one, preparing the hydraulic valve body to be processed, and clamping the hydraulic valve body by a fixture; step two, setting the processing size of the hydraulic valve body on a vertical machining center, and positioning and processing multiple pin holes; step three, using a combined reamer to process the inner hole and outer hole of the joint hole, ensuring that the coaxiality error of the inner hole and the outer hole is zero; step four, the inner hole is processed by a rolling cutter to process the roughness to Ra0.8; step five, benchwork processes the liquid hole; step six, removing the burrs of each cross corner. The present invention has high processing speed, high quality and high efficiency, protects the equipment, eliminates safety hazards, alleviates the pressure of the joint hole being processed only by CNC lathe, and brings good economic benefits to the enterprise.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic valve processing, and in particular relates to a method for processing a joint hole of a hydraulic valve body. Background Art

[0002] In the production process of hydraulic valves, the processing of valve body joint holes is often encountered. For example, the valve bodies of products such as one-way locks, two-way locks, hydraulically controlled one-way valves and valve adapters all have DN10, KJ13, DN16, KJ19 and other joint holes, and their processing volume accounts for 50% of the total valve body processing volume. The valve body joint holes are mainly composed of sealing holes, limit holes and pin holes. Figure 1 The figure is a schematic diagram of the DN10 connector hole structure, where 1 is a 2-Φ6 pin hole, 2 is a Φ14H9 inner hole, 3 is a Φ20H11 outer hole, and 4 is a 45° chamfer. The Φ14H9 is mainly used for sealing, and its roughness requirement is Ra1.6. According to our experience, if the roughness of the Φ14H9 inner hole can be increased to Ra0.8, the service life of the sealing ring at the male end of the connector will be increased by more than 20%. The function of the Φ20H11 inner hole is to install the U-shaped pin step at the male end of the DN10 connector, and the requirement for roughness is not high, but its coaxiality with the Φ14H9 sealing hole cannot exceed 0.025, otherwise it will cause difficulty in inserting the male end of the connector. The 2-Φ6 pin hole is used to install the DN10 U-shaped pin to prevent the male end of the connector from falling off. The symmetry requirement relative to the Φ14H9 inner hole is 0.2, and excess tolerance will cause difficulty in installing the U-shaped pin. Summary of the invention

[0003] The invention provides a method for machining a joint hole of a hydraulic valve body, which can solve the problem of excessive symmetry of the joint hole and improve the machining process speed and quality.

[0004] The technical solution of the present invention is: a method for processing a joint hole of a hydraulic valve body, the steps of which include firstly processing a pin hole by processing equipment, then completing the inner hole, outer hole and chamfer of the joint hole at one time by rough and fine forming cutters, and finally rolling the inner hole by a rolling cutter to improve the roughness;

[0005] Step 1, preparing a hydraulic valve body to be processed, and clamping the hydraulic valve body with a fixture;

[0006] Step 2: setting the processing size of the hydraulic valve body on the vertical machining center, and positioning and processing multiple pin holes according to the size requirements;

[0007] Step 3, using a combined reamer to process the inner hole and the outer hole of the joint hole, ensuring that the coaxiality error of the inner hole and the outer hole is zero;

[0008] Step 4: The inner hole is processed by rolling cutter to a roughness of Ra0.8;

[0009] Step 5: The fitter further processes the liquid hole;

[0010] Step 6: Remove burrs from all intersecting corners.

[0011] Preferably, the size of the pin hole is Φ6, and each joint hole has two symmetrical pin holes, the inner hole size of the joint hole is Φ14H9, and the outer hole size is Φ20H11.

[0012] Preferably, the above-mentioned processing equipment is a vertical machining center.

[0013] Preferably, in the above steps 2 and 3, the vertical machining center processes the joint hole and the pin hole according to the same reference, with high positioning accuracy.

[0014] Preferably, the chamfer is a 45° chamfer, and the inner hole and the outer hole of the joint hole are formed in one step when processing in step three.

[0015] Preferably, the combination reamer includes a handle and a blade body, and the blade body includes a first blade body, a second blade body, and a third blade body. A first groove is provided between the first blade body and the second blade body, and a second groove is provided between the second blade body and the third blade body. The outer diameters of the first blade body, the second blade body, and the third blade body decrease successively, and the cross-sections of the first groove and the second groove are arc-shaped. The outer diameter of the bottom of the first groove is smaller than the outer diameter of the second blade body, and the outer diameter of the bottom of the second groove is smaller than the outer diameter of the first blade body, so as to facilitate the withdrawal of the blade.

[0016] Preferably, the fixture includes a base plate, a Y-direction movable rail arranged on the base plate, a mounting plate I slidably arranged on the Y-direction movable rail, a Y-direction movable hydraulic cylinder driving the mounting plate I to move in the Y direction, a plurality of X-direction movable rails arranged on the mounting plate I, a clamping mechanism slidably arranged on the X-direction movable rail, and an X-direction movable hydraulic cylinder driving the clamping mechanism to move in the X direction, and the clamping mechanism includes a mounting plate II, a clamping mechanism arranged on the mounting plate II, and a mounting seat.

[0017] Preferably, at least three groups of the clamping mechanisms are provided, and correspondingly, three groups of the X-direction moving hydraulic cylinders and X-direction moving rails are provided.

[0018] Preferably, the cross-sections of the mounting plates I and II are T-shaped.

[0019] Preferably, the bottoms of the mounting plates I and II are provided with rollers to facilitate movement within the X-direction moving track and the Y-direction moving track.

[0020] Preferably, the clamping mechanism comprises a clamping hydraulic cylinder and a clamping plate, the clamping hydraulic cylinder is connected to the clamping plate via a hydraulic rod, and the workpiece is clamped and fixed via the clamping plate.

[0021] Preferably, the mounting seat is composed of two symmetrical mounting plates, the mounting plates are provided with mounting holes, the clamping hydraulic cylinder and the clamping plate are respectively arranged on both sides of the mounting plates, and the hydraulic rod passes through the mounting holes and is connected to the clamping plate.

[0022] Preferably, the mounting seat is composed of three mounting plates forming a concave structure, the vertical mounting plates on both sides are provided with mounting holes, the hydraulic rod passes through the mounting holes and is connected to the clamping plate, and the workpiece is arranged in the mounting seat and fixed by the clamping plate.

[0023] The advantages of the present invention are as follows: the present invention utilizes a vertical machining center for machining, the equipment has high precision and high rotation speed, the machining process of using a forming cutter + a rolling cutter is fast and of high quality, the machining of all (2-4) joint holes on a single side can be completed by clamping at one time, the number of shifts is increased from the original 80 pieces to 100 pieces, and the efficiency is improved by more than 20%; the roughness of the inner hole of Φ14H9 is increased from the original Ra1.6 to Ra0.8; it is ensured that the coaxiality of the inner holes of Φ14H9 and Φ20H11 will not exceed the tolerance; the problem of large equipment loss due to rotational bias in the original CNC lathe machining is solved, the equipment is protected, the potential safety hazard is eliminated, and the pressure of the joint holes being machined only by CNC lathe machining is relieved, the flexibility of production arrangement is greatly improved, equipment guarantee is provided for the timely completion of orders, and good economic benefits are brought to the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the DN10 joint hole;

[0025] Figure 2 It is a schematic diagram of the structure of the combined reamer used in the processing process of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the clamp used in the processing of the present invention;

[0027] Figure 4 is a top view of the structure of the fixture used in the processing of the present invention;

[0028] Figure 5 It is a structural front view of the clamp used in the processing of the present invention;

[0029] Figure 6 It is a schematic diagram of the structure of the mounting seat of the clamp used in the processing process of the present invention;

[0030] Figure 7 It is a cross-sectional schematic diagram of the mounting plate I and mounting plate II of the fixture used in the processing of the present invention;

[0031] in:

[0032] 1. Pin hole, 2. External hole, 3. Internal hole, 4. Chamfer;

[0033] 5. handle, 6. first blade body, 7. first groove, 8. second blade body, 9. second groove, 10. third blade body;

[0034] 111. Bottom plate, 112. X-axis moving track, 113. Mounting plate I, 114. Mounting plate II, 115. Y-axis moving hydraulic cylinder, 116. Mounting seat, 117. Clamping hydraulic cylinder, 118. Clamping plate, 119. X-axis moving hydraulic cylinder, 120. Y-axis moving track, 121. Workpiece, 122. Mounting hole, 123. Roller. DETAILED DESCRIPTION

[0035] The present invention is described clearly and completely below in conjunction with the accompanying drawings so that those skilled in the art can fully implement the present invention without having to make any creative work.

[0036] The specific implementation of the present invention is: a method for processing a joint hole of a hydraulic valve body, the steps of which include firstly processing a pin hole 1 by a vertical machining center, then completing an inner hole 3, an outer hole 2 and a chamfer 4 of the joint hole at one time by a rough and fine forming cutter, and finally rolling the inner hole with a rolling cutter to improve the roughness;

[0037] Step 1, preparing a hydraulic valve body to be processed, and clamping the hydraulic valve body with a fixture;

[0038] Step 2: setting the processing size of the hydraulic valve body on the vertical machining center, and positioning and machining a plurality of Φ6 pin holes 1 on the vertical machining center;

[0039] Step 3: The vertical machining center processes the joint hole and the pin hole according to the same reference, thus avoiding the problem of symmetry deviation of the two Φ6 pin holes 1 relative to the Φ14H9 inner hole 3. The combined reamer is used to process the Φ14H9 inner hole 3 and the Φ20H11 outer hole 2 of the joint hole, ensuring that the coaxiality error of the inner hole 3 and the outer hole 2 is zero;

[0040] Step 4: The inner hole 3 of Φ14H9 is finely processed by a rolling cutter, and the roughness of the inner hole 3 of Φ14H9 is increased from the original Ra1.6 to Ra0.8, and the service life of the sealing ring is increased by more than 20%;

[0041] Step 5: The fitter further processes the liquid hole;

[0042] Step 6: Remove burrs from all intersecting corners.

[0043] Preferably, the chamfer 4 is a 45° chamfer, and the inner hole and the outer hole of the joint hole are formed in one step when processing in step three.

[0044] Preferably, Figure 2As shown, the combined reamer includes a handle 5 and a blade body, and the blade body includes a first blade body 6, a second blade body 8, and a third blade body 10. A first groove 7 is provided between the first blade body 6 and the second blade body 8, and a second groove 9 is provided between the second blade body 8 and the third blade body 10. The outer diameters of the first blade body 6, the second blade body 8, and the third blade body 10 decrease successively, and the cross-sections of the first groove 7 and the second groove 9 are arc-shaped. The outer diameter of the bottom of the first groove 7 is smaller than the outer diameter of the second blade body 8, and the outer diameter of the bottom of the second groove 9 is smaller than the outer diameter of the first blade body 6, so as to facilitate the withdrawal of the blade.

[0045] Preferably, Figure 3-7 As shown, the fixture includes a base plate 111, a Y-direction movable rail 120 arranged on the base plate 111, a mounting plate I 113 slidably arranged on the Y-direction movable rail 120, a Y-direction movable hydraulic cylinder 115 driving the mounting plate I 113 to move in the Y direction, a plurality of X-direction movable rails 112 arranged on the mounting plate I 113, a clamping mechanism slidably arranged on the X-direction movable rail 112, and an X-direction movable hydraulic cylinder 119 driving the clamping mechanism to move in the X direction. The clamping mechanism includes a mounting plate II 114, a clamping mechanism arranged on the mounting plate II 114, and a mounting seat 116.

[0046] Preferably, at least three groups of the clamping mechanisms are provided, and correspondingly, three groups of the X-direction moving hydraulic cylinders 119 and the X-direction moving rails 112 are provided.

[0047] Preferably, the cross-sections of the mounting plate Ⅰ113 and the mounting plate Ⅱ114 are T-shaped.

[0048] Preferably, rollers 123 are provided at the bottom of the mounting plate I 113 and the mounting plate II 114 to facilitate movement within the X-axis moving track 112 and the Y-axis moving track 120 .

[0049] Preferably, the clamping mechanism includes a clamping hydraulic cylinder 117 and a clamping plate 118 , and the clamping hydraulic cylinder 117 is connected to the clamping plate 118 via a hydraulic rod, and the workpiece 121 is clamped and fixed via the clamping plate 118 .

[0050] Preferably, the mounting seat 116 is composed of two symmetrical mounting plates, each of which is provided with a mounting hole 122 , and the clamping hydraulic cylinder 117 and the clamping plate 118 are respectively arranged on both sides of the mounting plate, and the hydraulic rod passes through the mounting hole 122 and is connected to the clamping plate 118 .

[0051] Preferably, the mounting seat 116 is composed of three mounting plates forming a concave structure, and mounting holes 122 are provided on the vertical mounting plates on both sides. The hydraulic rod passes through the mounting holes 122 and is connected to the clamping plate 118, and the workpiece 121 is set in the mounting seat 116 and fixed by the clamping plate 118.

[0052] The factory's existing vertical processing equipment is used to automatically process the joint holes. A new processing method is used to first process the pin hole and then form the joint holes in one step using the same reference. This not only increases the valve body sealing life, but also improves production efficiency and alleviates the pressure of relying solely on CNC lathe processing for the joint holes. The flexibility of production arrangements has been greatly improved, providing equipment guarantee for the timely completion of orders, improving the quality of the produced joint holes, and solving the problem of excessive symmetry of the joint holes.

[0053] The preferred embodiments of the present invention are described above. It should be pointed out that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; any simple modifications, equivalent changes and modifications made to the above embodiments by any technician familiar with the art based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention, shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for machining a joint hole of a hydraulic valve body, characterized in that: The steps include firstly processing the pin hole by processing equipment, then completing the inner hole, outer hole and chamfer of the joint hole by rough and fine forming cutters at one time, and finally rolling the inner hole by rolling cutters to improve the roughness, wherein the pin hole is used to install the U-shaped pin, and the outer hole is used to install the U-shaped pin step at the male end of the joint; Step 1, preparing a hydraulic valve body to be processed, and clamping the hydraulic valve body with a fixture; Step 2: setting the processing dimensions of the hydraulic valve body on a vertical machining center, and positioning and processing a plurality of pin holes; Step 3, using a combined reamer to process the inner hole and the outer hole of the joint hole, ensuring that the coaxiality error of the inner hole and the outer hole is zero; Step 4: The inner hole is processed by rolling cutter to a roughness of Ra0.8; Step 5: The fitter further processes the liquid hole; Step 6, remove the burrs on the cross corners; In step 3, the inner hole and the outer hole of the joint hole are processed in one step; The combined reamer comprises a tool handle and a tool body, wherein the tool body comprises a first blade body, a second blade body and a third blade body, a first groove is provided between the first blade body and the second blade body, a second groove is provided between the second blade body and the third blade body, the outer diameters of the first blade body, the second blade body and the third blade body decrease successively, the cross-sections of the first groove and the second groove are arc-shaped, the outer diameter of the bottom of the first groove is smaller than the outer diameter of the second blade body, and the outer diameter of the bottom of the second groove is smaller than the outer diameter of the first blade body; the fixture in the above step 1 comprises a base plate, a Y-direction movable track arranged on the base plate, a mounting plate I slidably arranged on the Y-direction movable track, a Y-direction movable hydraulic cylinder driving the mounting plate I to move in the Y direction, a plurality of X-direction movable tracks arranged on the mounting plate I, a clamping mechanism slidably arranged on the X-direction movable track, and an X-direction movable hydraulic cylinder driving the clamping mechanism to move in the X direction, wherein the clamping mechanism The structure includes a mounting plate II, a clamping mechanism and a mounting seat arranged on the mounting plate II, the clamping mechanism includes a clamping hydraulic cylinder and a clamping plate, the clamping hydraulic cylinder is connected to the clamping plate through a hydraulic rod, and the workpiece is clamped and fixed by the clamping plate; the clamping mechanism is provided with at least three groups, and the corresponding X-direction movable hydraulic cylinder and X-direction movable track are provided with three groups; the cross-section of the mounting plate I and the mounting plate II is T-shaped; the bottom of the mounting plate I and the mounting plate II is provided with rollers, which are convenient for moving in the X-direction movable track and the Y-direction movable track; the mounting seat is composed of two symmetrical mounting plates, the mounting plates are provided with mounting holes, the clamping hydraulic cylinder and the clamping plate are respectively arranged on both sides of the mounting plates, and the hydraulic rod is connected to the clamping plate through the mounting holes; the mounting seat is composed of three mounting plates to form a concave structure, the vertical mounting plates on both sides are provided with mounting holes, the hydraulic rod is connected to the clamping plate through the mounting holes, and the workpiece is arranged in the mounting seat and fixed by the clamping plate.

2. A method for machining a joint hole of a hydraulic valve body according to claim 1, characterized in that: In the above steps 2 and 3, the vertical machining center processes the inner hole, outer hole and pin hole according to the same reference, with high position accuracy.

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