Hydraulic clamp production process

Abstract

The invention discloses a hydraulic clamp production process. Firstly, accessories are prepared, wherein a piston assembly comprises a piston, a cylinder body, a spring, a wear-resistant ring, an O-shaped ring, a Y-shaped ring and a check ring; the cylinder body, the piston and the pin shaft are made of special materials (40Cr and 42Crmo), the stroke length size of the piston is increased, the strength and smoothness of the cylinder body, the piston and the pin shaft are relimited by adopting a heat treatment and machining mode, and the service life of the cylinder body, the piston and the pin shaft is prolonged. A hard, tough and wear-resistant material is replaced, the strength of the material is improved to be larger than that of the material in the prior art through heat treatment, and the smoothness and the matching size between the cylinder wall and the piston are changed in a matched mode, so that the guide wear-resistant effect can be improved, and friction and extrusion between the piston and the cylinder wall are reduced; the bearing capacity and the unbalance loading force bearing effect are improved, meanwhile, the abrasion problem of the piston and the cylinder wall is avoided, the stroke length size of the piston is increased, the movement stroke effect of the piston is improved, the movement stroke of the pressing plate is increased, and therefore the use stroke of the clamp is increased.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic clamp processing, in particular to a hydraulic clamp production process. Background Art

[0002] Hydraulic clamps are clamps that use hydraulic components to replace mechanical parts and realize automatic positioning, support and clamping of workpieces through hydraulic control. They have the advantages of strong clamping force, reliable clamping, stable operation and convenient use. The existing split hydraulic clamps include piston components, anti-fool valve components and clamp components.

[0003] The piston assembly includes a piston, a cylinder body, a spring, a wear-resistant ring, an O-ring, a Y-ring, and a retaining ring; the foolproof valve assembly includes a base, a tubing joint, a valve, a valve block, and an O-ring; The fixture assembly includes a pressure plate, a base, a pin and a retaining spring; In the piston assembly, the piston is installed inside the cylinder, the spring is installed between the top of the piston and the cylinder, the wear ring, Y-ring and retaining ring are installed on the surface of the piston for sealing and sliding connection with the inner wall of the cylinder, and the O-ring is installed at the bottom of the cylinder to form a seal with the base; The installation is fixed by screws passing through the cylinder body and the base.

[0004] In the foolproof valve assembly, the valve is connected to the valve block through an O-ring seal, the valve block is connected to the oil pipe joint to form a whole, the connected whole is installed on the base through positioning screws, the oil pipe joint is connected to the base through the oil pipe, the oil is transported to the inside of the cylinder, and the piston is pushed up and down for reciprocating motion.

[0005] In the clamp assembly, the pressure plate is connected to the base through a pin, and the retaining spring serves to stabilize the pin.

[0006] In summary, when the above-mentioned hydraulic clamp is in use, the oil delivery will cause the piston to lift up, and the front end of the pressure plate will also flip and press down. At this time, the top of the piston will be subjected to the eccentric load and the contact surface between the piston and the cylinder wall will wear.

[0007] Therefore, a hydraulic clamp production process is proposed to solve this problem. Summary of the invention

[0008] To achieve the above object, the present invention provides the following technical solution: a hydraulic clamp production process, comprising the following steps: Step 1: Parts preparation: Piston assembly: including piston, cylinder body, spring, wear ring, O-ring, Y-ring, retaining ring; The foolproof valve assembly includes a base, a tubing joint, a valve, a valve block and an O-ring; The fixture assembly includes a pressure plate, a base, a pin and a retaining spring; The piston material in the piston assembly is changed to special material (40Cr or 42Crmo); And the pin material is changed to special material (40Cr); The remaining accessories are obtained through OEM channels.

[0009] Step 2: Processing: Heat treatment is used to process the cylinder body so that the high-frequency hardness of the cylinder wall reaches 25-28HRC, and the cylinder wall of the cylinder body is processed to achieve a surface finish of Ra0.4; The pin is heat treated to make the overall hardness of the pin reach 32-35HRC, and the surface of the pin is smoothed to make the surface smoothness of the pin reach Ra0.8; The piston is then tempered and heat treated to make the overall hardness of the piston reach 32-35HRC, and the surface of the piston is processed to make the surface finish of the piston reach Ra0.4 Step 3: Selection of the full-stroke piston length of the hydraulic clamp: The full-stroke piston length of the hydraulic clamp made of special material (42Crmo) is selected to be 30-32mm, which can be increased to 16mm and 26mm compared with the existing technology; Step 4: Assemble the fixture: First, assemble the piston assembly and clean the piston cylinder; apply butter to the cylinder and O-ring, and install the O-ring to the bottom of the cylinder; install the Y-ring, retaining ring, and wear-resistant ring on the surface of the piston; put the spring into the cylinder, and press the piston into the cylinder from bottom to top; To assemble the foolproof valve assembly, first clean the valve block, then install the valve - torque 70NM, then install the oil pipe joint; Finally, assemble the fixture assembly, install the piston assembly into the base with screws, fix the cylinder body to the top of the base with screws, and make the piston and the oil delivery channel correspond, and install the pressure plate and the base with the retaining ring and the pin shaft.

[0010] Preferably, in step 1, in the foolproof valve assembly, the valve, valve block, O-ring and base are used in combination.

[0011] Preferably, in step 1, in the fixture assembly, the base is processed by cutting the base using a machining center according to size and shape requirements, and an oil delivery channel is opened at the bottom of the cylinder body where the base is installed, and an oil pipe interface connected to the oil release channel is opened on one side of the base.

[0012] Preferably, in step 2, the processing of the pin, the piston and the cylinder body must be strictly processed according to the requirements.

[0013] Preferably, in step 2, after the pin, piston and cylinder body are processed, two inspections must be carried out, and the two inspections require two people to conduct the inspections and record the inspection data for comparison.

[0014] Preferably, in step 4, the piston pressing process should ensure that the Y-ring, retaining ring, wear-resistant ring and the inner wall of the cylinder body are in a sealed sliding state.

[0015] Preferably, in step 4, the spring is mounted on the top of the piston, and the spring needs to be between the cylinder body and the piston.

[0016] Preferably, in step 4, the O-ring is to be installed between the valve and the valve body. Before installation, the O-ring is first installed inside one side of the valve body, and then the valve is installed.

[0017] Preferably, in step 4, the valve and the oil pipe joint are respectively installed on both sides of the valve block, the oil pipe joint needs to be connected to the oil pipe for use, and the oil pipe needs to be installed with the oil pipe interface opened on one side of the base.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The patent of the present invention replaces the materials of the cylinder body, piston and pin shaft with special materials (40Cr, 42Crmo), increases the length of the piston, adopts hot working methods, and redefines the strength and finish of the cylinder body, piston and pin shaft. It replaces the hard, tough and wear-resistant materials and increases the strength of the materials to a level greater than that of the existing materials through hot working, and changes the finish and matching dimensions between the cylinder wall and the piston. The guide wear resistance effect can be increased, thereby reducing the friction and extrusion between the piston and the cylinder wall. While improving the bearing capacity and eccentric load effect, the wear problem of the piston and the cylinder wall is avoided. In addition, the increase in the size of the piston increases the movement stroke of the piston, increases the active stroke of the pressure plate, and thus increases the use stroke of the clamp. DETAILED DESCRIPTION

[0019] The present invention will be described in more detail below by way of examples, which are merely illustrative and do not in any way limit the scope of the present invention.

[0020] The present invention provides a technical solution: a hydraulic clamp production process, comprising the following steps: Step 1: Parts preparation: Piston assembly: including piston, cylinder body, spring, wear ring, O-ring, Y-ring, retaining ring; The foolproof valve assembly includes a base, a tubing joint, a valve, a valve block and an O-ring; The fixture assembly includes a pressure plate, a base, a pin and a retaining spring; The piston material in the piston assembly is changed to special material (40Cr or 42Crmo); And the pin material is changed to special material (40Cr); The remaining accessories are obtained through OEM channels.

[0021] Step 2: Processing: Heat treatment is used to process the cylinder body so that the high-frequency hardness of the cylinder wall reaches 25-28HRC, and the cylinder wall of the cylinder body is processed to achieve a surface finish of Ra0.4; The pin is heat treated to make the overall hardness of the pin reach 32-35HRC, and the surface of the pin is smoothed to make the surface smoothness of the pin reach Ra0.8; The piston is then tempered and heat treated to make the overall hardness of the piston reach 32-35HRC, and the surface of the piston is processed to make the surface finish of the piston reach Ra0.4 Step 3: Selection of the full-stroke piston length for hydraulic clamps: Increasing the piston stroke length of hydraulic clamps made of special materials (42Crmo) can make the hydraulic clamp clamping plate stroke reach 16mm and 26mm, which can increase the hydraulic clamp clamping stroke by 10-17mm compared to the existing technology; Step 4: Assemble the fixture: First, assemble the piston assembly and clean the piston cylinder; apply butter to the cylinder and O-ring, and install the O-ring to the bottom of the cylinder; install the Y-ring, retaining ring, and wear-resistant ring on the surface of the piston; put the spring into the cylinder, and press the piston into the cylinder from bottom to top; To assemble the foolproof valve assembly, first clean the valve block, then install the valve - torque 70NM, then install the oil pipe joint; Finally, assemble the fixture assembly, install the piston assembly into the base with screws, fix the cylinder body to the top of the base with screws, and make the piston and the oil delivery channel correspond, and install the pressure plate and the base with the retaining ring and the pin shaft.

[0022] Embodiment 1: First, prepare the accessories: piston assembly: including piston, cylinder body, spring and wear-resistant ring, O-ring, Y-ring, retaining ring; foolproof valve assembly including base, oil pipe joint, valve, valve block and O-ring; fixture assembly including pressure plate, base, pin and retaining spring; the piston material in the piston assembly is changed to special material (40Cr or 42Crmo); and the pin material is changed to special material (40Cr); the remaining accessories are obtained through the processing yard channel; secondly, processing: the cylinder body is processed by heat treatment to make the high-frequency hardness of the cylinder wall reach 25-28HRC, and the cylinder wall of the cylinder body is smoothed to make the surface smoothness of the cylinder wall reach Ra0.4; the pin is processed by heat treatment to make the overall hardness of the pin reach 32-35HRC, and the surface of the pin is smoothed to make the surface smoothness of the pin reach Ra0.8; then the piston is tempered and surface heat treated to make the piston The overall hardness reaches 32-35HRC, and the piston surface is smoothed to make the piston surface smooth to Ra0.4; then the hydraulic clamp is used to clamp the full-stroke piston length: the hydraulic clamp made of special material (42Crmo) is used to clamp the full-stroke piston length of 26mm, which can increase the stroke by 16mm compared with the existing technology; finally, the fixture is assembled: first, the piston assembly is assembled and the piston cylinder is cleaned; the cylinder and O-ring are greased with butter, and the O-ring is installed to the bottom of the cylinder; Y-rings, retaining rings, and wear-resistant rings are installed on the piston surface; the spring is placed inside the cylinder, and the piston is pressed into the cylinder from bottom to top; the foolproof valve assembly is assembled, the valve block is cleaned first, and then the valve-torque torque is 70NM, and then the oil pipe joint is installed; finally, the fixture assembly is assembled, the piston assembly is installed into the base by screws, the cylinder body is fixed to the top of the base by screws, and the piston and the oil delivery channel are aligned, and the pressure plate and the base are installed by the retaining ring and the pin.

[0023] Embodiment 2: In embodiment 1, the following steps are added: In step 1, in the anti-foolproof valve assembly, the oil pipe joint needs to be used with the oil pipe; in the fixture assembly, the base is processed according to the size and shape requirements, and the base is cut using a machining center, and an oil delivery channel is opened at the bottom of the cylinder body where the base is installed. An oil pipe interface connected to the oil release channel must be opened on one side of the base.

[0024] First, prepare the accessories: Piston assembly: including piston, cylinder, spring, wear-resistant ring, O-ring, Y-ring, retaining ring; foolproof valve assembly including base, oil pipe joint, valve, valve block and O-ring; fixture assembly including pressure plate, base, pin and retaining ring; the piston material in the piston assembly is changed to special material (40Cr or 42Crmo); and the pin material is changed to special material (40Cr); the rest of the accessories are obtained through the processing plant channel. In the foolproof valve assembly, the oil pipe joint needs to be used with the oil pipe; in the fixture assembly , the processing of the base, according to the size and shape requirements, use the machining center to cut the base, and open an oil delivery channel at the bottom of the base where the cylinder body is installed, and an oil pipe interface connected to the oil release channel should be opened on one side of the base; secondly, the processing: the cylinder body is processed by heat treatment to make the high-frequency hardness of the cylinder wall reach 25-28HRC, and the cylinder wall of the cylinder body is processed to make the surface finish of the cylinder wall reach Ra0.4; the pin is processed by heat treatment to make the overall hardness of the pin reach 32-35HRC, and the pin is processed The surface is processed to make the surface finish of the pin reach Ra0.8; the piston is then tempered and heat treated to make the overall hardness of the piston reach 32-35HRC, and the piston surface is processed to make the surface finish of the piston reach Ra0.4; then the hydraulic clamp is used to clamp the full-stroke piston length: the hydraulic clamp made of special material (42Crmo) is used to clamp the full-stroke piston length of 26mm, which can increase the stroke by 16mm compared with the existing technology; finally, the clamp is assembled: first, the piston assembly Assemble, clean the piston cylinder; apply butter to the cylinder and O-ring, and install the O-ring to the bottom of the cylinder; install Y-ring, retaining ring and wear-resistant ring on the surface of the piston; put the spring into the cylinder, and press the piston into the cylinder from bottom to top; assemble the foolproof valve assembly, first clean the valve block, then install the valve-torque torque 70NM, and then install the oil pipe joint; finally assemble the fixture assembly, install the piston assembly into the base with screws, fix the cylinder to the top of the base with screws, and make the piston and the oil delivery channel correspond, and install the pressure plate and the base with the retaining ring and pin.

[0025] Embodiment 3: In embodiment 2, the following steps are added: In step 2, the processing of the pin, piston and cylinder must be strictly in accordance with the requirements; after the processing of the pin, piston and cylinder is completed, two inspections must be carried out, and two inspections require two people to conduct the inspections and record the inspection data for comparison.

[0026] First, prepare the accessories: Piston assembly: including piston, cylinder, spring, wear-resistant ring, O-ring, Y-ring, retaining ring; fool-proof valve assembly including base, oil pipe joint, valve, valve block and O-ring; fixture assembly including pressure plate, base, pin and retaining ring; the piston material in the piston assembly is changed to special material (40Cr or 42Crmo); and the pin material is changed to special material (40Cr); the rest of the accessories are obtained through the processing plant channel. In the fool-proof valve assembly, the oil pipe joint needs to be used with the oil pipe; in the fixture assembly, the base is processed according to the size and shape requirements, and the base is processed using a machining center. The seat is cut, and an oil delivery channel is opened at the bottom of the cylinder body installation position of the base, and an oil pipe interface connected to the oil release channel is opened on one side of the base; secondly, the processing: the cylinder body is processed by heat treatment to make the high-frequency hardness of the cylinder wall reach 25-28HRC, and the cylinder wall of the cylinder body is processed by smoothness to make the surface smoothness of the cylinder wall reach Ra0.4; the pin is processed by heat treatment to make the overall hardness of the pin reach 32-35HRC, and the surface of the pin is processed by smoothness to make the surface smoothness of the pin reach Ra0.8; then the piston is tempered and the surface heat treated to make the overall hardness of the piston The degree reaches 32-35HRC, and the piston surface is processed to make the piston surface smooth to Ra0.4. The processing of the pin shaft, piston and cylinder body must be strictly processed in accordance with the requirements; after the processing of the pin shaft, piston and cylinder body is completed, two inspections must be carried out, and two inspections require two people to inspect and record the inspection data for comparison; then the hydraulic clamp clamping full stroke piston length selection: special material (42Crmo) hydraulic clamp increasing the hydraulic clamp piston stroke length can make the hydraulic clamp clamping plate stroke reach 16mm and 26mm, which can increase 10-17 compared with the existing technology mm hydraulic clamp clamping stroke; finally, assemble the clamp: first, assemble the piston assembly and clean the piston cylinder; apply butter to the cylinder and O-ring, and install the O-ring to the bottom of the cylinder; install Y-ring, retaining ring, and wear-resistant ring on the piston surface; put the spring into the cylinder, and press the piston into the cylinder from bottom to top; assemble the anti-fool valve assembly, first clean the valve block, then install the valve-torque torque 70NM, and then install the oil pipe joint; finally, assemble the clamp assembly, install the piston assembly into the base with screws, fix the cylinder to the top of the base with screws, and make the piston and the oil delivery channel correspond, and install the pressure plate and the base with the retaining ring and the pin.

[0027] Embodiment 4: In embodiment 3, the following steps are added: In step 4, the piston pressing process must ensure that the Y-ring, retaining ring, wear-resistant ring and the inner wall of the cylinder are in a sealed sliding state; the spring must be mounted on the top of the piston, and the spring must be between the cylinder and the piston; the O-ring must be installed between the valve and the valve body. Before installation, first install the O-ring to the inside of one side of the valve body, and then install the valve; the valve and the oil pipe joint are installed on both sides of the valve block respectively. The oil pipe joint needs to be connected to the oil pipe, and the oil pipe must be installed with the oil pipe interface opened on one side of the base.

[0028] First, prepare the accessories: Piston assembly: including piston, cylinder body, spring and wear-resistant ring, O-ring, Y-ring, retaining ring; anti-fool valve assembly including base, oil pipe joint, valve, valve block and O-ring; fixture assembly including pressure plate, base, pin and retaining spring; the piston material in the piston assembly is changed to special material (40Cr or 42Crmo); and the pin material is changed to special material (40Cr); the remaining accessories are obtained through the processing plant channel. In the anti-fool valve assembly, the oil pipe joint needs to be used with the oil pipe; in the fixture assembly, the base is processed according to the size and shape requirements. The base is cut using a machining center, and an oil delivery channel is opened at the bottom of the cylinder body installation position of the base, and an oil release channel is opened on one side of the base Connected oil pipe interface; secondly, processing: the cylinder body is processed by heat treatment to make the high-frequency hardness of the cylinder wall reach 25-28HRC, and the cylinder wall of the cylinder body is processed by smoothness processing to make the surface smoothness of the cylinder wall reach Ra0.4; the pin is processed by heat treatment to make the overall hardness of the pin reach 32-35HRC, and the surface of the pin is processed by smoothness processing to make the surface smoothness of the pin reach Ra0.8; then the piston is tempered and surface heat treated to make the overall hardness of the piston reach 32-35HRC, and the surface of the piston is processed by smoothness processing to make the surface smoothness of the piston reach Ra0.4. The processing of the pin, piston and cylinder body must be strictly in accordance with the requirements; the pin, piston and cylinder body After the processing is completed, two inspections must be carried out, and two inspections require two people to inspect and record the inspection data for comparison; then the hydraulic clamp clamping full stroke piston length is selected: the hydraulic clamp made of special materials (42Crmo) increases the hydraulic clamp piston stroke length to make the hydraulic clamp clamping plate stroke reach 16mm and 26mm, which can increase the hydraulic clamp clamping stroke by 10-17mm compared with the existing technology; finally, the clamp is assembled: first, the piston assembly is assembled, and the piston cylinder is cleaned; the cylinder and O-ring are greased, and the O-ring is installed to the bottom of the cylinder; the Y-ring, retaining ring, and wear-resistant ring are installed on the surface of the piston; the spring is placed inside the cylinder, and the piston is pressed into the cylinder from bottom to top; the foolproof valve assembly is assembled, and the valve block is cleaned first, and then Then install the valve - torque moment 70NM, and then install the oil pipe joint; finally assemble the fixture assembly, install the piston assembly into the base with screws, fix the cylinder body to the top of the base with screws, and make the piston and the oil delivery channel correspond, and install the pressure plate and the base with the retaining ring and the pin; during the piston pressing process, ensure that the Y-ring, retaining ring, wear-resistant ring and the inner wall of the cylinder body are in a sealed sliding state; the spring should be sleeved on the top of the piston, and the spring needs to be between the cylinder body and the piston; the O-ring should be installed between the valve and the valve body. Before installation, install the O-ring to the inside of one side of the valve body, and then install the valve; the valve and the oil pipe joint are installed on both sides of the valve block respectively. The oil pipe joint needs to be connected to the oil pipe for use, and the oil pipe should be installed with the oil pipe interface opened on one side of the base.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic clamp production process, characterized in that: The following steps are involved: Step 1: Parts preparation: Piston assembly: including piston, cylinder body, spring, wear ring, O-ring, Y-ring, retaining ring; The foolproof valve assembly includes a base, a tubing joint, a valve, a valve block and an O-ring; The fixture assembly includes a pressure plate, a base, a pin and a retaining spring; The piston material in the piston assembly is changed to special material (40Cr or 42Crmo); And the pin material is changed to special material (40Cr or 42Crmo); The remaining parts are obtained through OEM channels; Step 2: Processing: Heat treatment is used to process the cylinder body so that the high-frequency hardness of the cylinder wall reaches 25-28HRC, and the cylinder wall of the cylinder body is processed to achieve a surface finish of Ra0.4; The pin is heat treated to make the overall hardness of the pin reach 32-35HRC, and the surface of the pin is smoothed to make the surface smoothness of the pin not less than Ra0.8; Then the piston is quenched and tempered and the surface is heat treated to make the overall hardness of the piston reach 32-35HRC, and the surface of the piston is smoothed to make the surface smoothness of the piston reach Ra0.4; Step 3: Selection of hydraulic clamp piston: special material (42Crmo or 40Cr). By increasing the stroke length of the hydraulic clamp piston, the hydraulic clamp clamping plate stroke can reach 16mm and 26mm, which can increase the hydraulic clamp clamping stroke by 10-17mm compared with the existing technology; Step 4: Assemble the fixture: First, assemble the piston assembly and clean the piston cylinder; apply butter to the cylinder and O-ring, and install the O-ring to the bottom of the cylinder; install the Y-ring, retaining ring, and wear-resistant ring on the surface of the piston; put the spring into the cylinder, and press the piston into the cylinder from bottom to top; To assemble the foolproof valve assembly, first clean the valve block, then install the valve - torque 50-60NM, then install the oil pipe joint; Finally, assemble the fixture assembly, install the piston assembly into the base with screws, fix the cylinder body to the top of the base with screws, and make the piston and the oil delivery channel correspond, and install the pressure plate and the base with the retaining ring and the pin shaft.

2. A hydraulic clamp production process according to claim 1, characterized in that: In step 1, the valve, valve block, O-ring and seat are used together in the foolproof valve assembly.

3. A hydraulic clamp production process according to claim 1, characterized in that: In step 1, in the fixture assembly, the base is machined using a machining center according to size and shape requirements, and an oil delivery channel is opened at the bottom of the cylinder body where the base is installed. An oil pipe interface connected to the oil release channel is opened on one side of the base.

4. A hydraulic clamp production process according to claim 1, characterized in that: In step 2, the machining of the pin, piston and cylinder must be strictly in accordance with the requirements.

5. The hydraulic clamp production process according to claim 1, characterized in that: In step 2, after the pin, piston and cylinder are processed, they must be inspected twice, and two people are required to perform the two inspections and record the inspection data for comparison.

6. A hydraulic clamp production process according to claim 1, characterized in that: In step 4, the piston is pressed into the process to ensure that the Y-ring, retaining ring, wear ring and the inner wall of the cylinder are in a sealed sliding state.

7. The hydraulic clamp production process according to claim 1, characterized in that: In step 4, the spring needs to be placed on top of the piston. The spring needs to be between the cylinder and the piston.

8. The hydraulic clamp production process according to claim 1, characterized in that: In step 4, the O-ring is to be installed between the valve and the valve body. Before installation, install the O-ring to the inside of one side of the valve body, and then install the valve.

9. The hydraulic clamp production process according to claim 1, characterized in that: In step 4, the valve and the oil pipe joint are installed on both sides of the valve block respectively. The oil pipe joint needs to be connected to the oil pipe for use, and the oil pipe needs to be installed with the oil pipe interface opened on one side of the base.